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d85b37a955
FFmpeg/libavcodec/avcodec.h
Anton Khirnov 019ab88a95 lavc: add an option for exporting cropping information to the caller 
Also, add generic code for handling cropping, so the decoders can export
just the cropping size and not bother with the rest.
2017-01-12 16:24:15 +01:00

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/*
* copyright (c) 2001 Fabrice Bellard
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef AVCODEC_AVCODEC_H
#define AVCODEC_AVCODEC_H
/**
* @file
* @ingroup libavc
* Libavcodec external API header
*/
#include <errno.h>
#include "libavutil/samplefmt.h"
#include "libavutil/attributes.h"
#include "libavutil/avutil.h"
#include "libavutil/buffer.h"
#include "libavutil/cpu.h"
#include "libavutil/dict.h"
#include "libavutil/frame.h"
#include "libavutil/log.h"
#include "libavutil/pixfmt.h"
#include "libavutil/rational.h"
#include "version.h"
#if FF_API_FAST_MALLOC
// to provide fast_*alloc
#include "libavutil/mem.h"
#endif
/**
* @defgroup libavc Encoding/Decoding Library
* @{
*
* @defgroup lavc_decoding Decoding
* @{
* @}
*
* @defgroup lavc_encoding Encoding
* @{
* @}
*
* @defgroup lavc_codec Codecs
* @{
* @defgroup lavc_codec_native Native Codecs
* @{
* @}
* @defgroup lavc_codec_wrappers External library wrappers
* @{
* @}
* @defgroup lavc_codec_hwaccel Hardware Accelerators bridge
* @{
* @}
* @}
* @defgroup lavc_internal Internal
* @{
* @}
* @}
*/
/**
* @ingroup libavc
* @defgroup lavc_encdec send/receive encoding and decoding API overview
* @{
*
* The avcodec_send_packet()/avcodec_receive_frame()/avcodec_send_frame()/
* avcodec_receive_packet() functions provide an encode/decode API, which
* decouples input and output.
*
* The API is very similar for encoding/decoding and audio/video, and works as
* follows:
* - Set up and open the AVCodecContext as usual.
* - Send valid input:
* - For decoding, call avcodec_send_packet() to give the decoder raw
* compressed data in an AVPacket.
* - For encoding, call avcodec_send_frame() to give the decoder an AVFrame
* containing uncompressed audio or video.
* In both cases, it is recommended that AVPackets and AVFrames are
* refcounted, or libavcodec might have to copy the input data. (libavformat
* always returns refcounted AVPackets, and av_frame_get_buffer() allocates
* refcounted AVFrames.)
* - Receive output in a loop. Periodically call one of the avcodec_receive_*()
* functions and process their output:
* - For decoding, call avcodec_receive_frame(). On success, it will return
* an AVFrame containing uncompressed audio or video data.
* - For encoding, call avcodec_receive_packet(). On success, it will return
* an AVPacket with a compressed frame.
* Repeat this call until it returns AVERROR(EAGAIN) or an error. The
* AVERROR(EAGAIN) return value means that new input data is required to
* return new output. In this case, continue with sending input. For each
* input frame/packet, the codec will typically return 1 output frame/packet,
* but it can also be 0 or more than 1.
*
* At the beginning of decoding or encoding, the codec might accept multiple
* input frames/packets without returning a frame, until its internal buffers
* are filled. This situation is handled transparently if you follow the steps
* outlined above.
*
* End of stream situations. These require "flushing" (aka draining) the codec,
* as the codec might buffer multiple frames or packets internally for
* performance or out of necessity (consider B-frames).
* This is handled as follows:
* - Instead of valid input, send NULL to the avcodec_send_packet() (decoding)
* or avcodec_send_frame() (encoding) functions. This will enter draining
* mode.
* - Call avcodec_receive_frame() (decoding) or avcodec_receive_packet()
* (encoding) in a loop until AVERROR_EOF is returned. The functions will
* not return AVERROR(EAGAIN), unless you forgot to enter draining mode.
* - Before decoding can be resumed again, the codec has to be reset with
* avcodec_flush_buffers().
*
* Using the API as outlined above is highly recommended. But it is also
* possible to call functions outside of this rigid schema. For example, you can
* call avcodec_send_packet() repeatedly without calling
* avcodec_receive_frame(). In this case, avcodec_send_packet() will succeed
* until the codec's internal buffer has been filled up (which is typically of
* size 1 per output frame, after initial input), and then reject input with
* AVERROR(EAGAIN). Once it starts rejecting input, you have no choice but to
* read at least some output.
*
* Not all codecs will follow a rigid and predictable dataflow; the only
* guarantee is that an AVERROR(EAGAIN) return value on a send/receive call on
* one end implies that a receive/send call on the other end will succeed. In
* general, no codec will permit unlimited buffering of input or output.
*
* This API replaces the following legacy functions:
* - avcodec_decode_video2() and avcodec_decode_audio4():
* Use avcodec_send_packet() to feed input to the decoder, then use
* avcodec_receive_frame() to receive decoded frames after each packet.
* Unlike with the old video decoding API, multiple frames might result from
* a packet. For audio, splitting the input packet into frames by partially
* decoding packets becomes transparent to the API user. You never need to
* feed an AVPacket to the API twice.
* Additionally, sending a flush/draining packet is required only once.
* - avcodec_encode_video2()/avcodec_encode_audio2():
* Use avcodec_send_frame() to feed input to the encoder, then use
* avcodec_receive_packet() to receive encoded packets.
* Providing user-allocated buffers for avcodec_receive_packet() is not
* possible.
* - The new API does not handle subtitles yet.
*
* Mixing new and old function calls on the same AVCodecContext is not allowed,
* and will result in arbitrary behavior.
*
* Some codecs might require using the new API; using the old API will return
* an error when calling it.
* @}
*/
/**
* @defgroup lavc_core Core functions/structures.
* @ingroup libavc
*
* Basic definitions, functions for querying libavcodec capabilities,
* allocating core structures, etc.
* @{
*/
/**
* Identify the syntax and semantics of the bitstream.
* The principle is roughly:
* Two decoders with the same ID can decode the same streams.
* Two encoders with the same ID can encode compatible streams.
* There may be slight deviations from the principle due to implementation
* details.
*
* If you add a codec ID to this list, add it so that
* 1. no value of a existing codec ID changes (that would break ABI),
* 2. it is as close as possible to similar codecs.
*
* After adding new codec IDs, do not forget to add an entry to the codec
* descriptor list and bump libavcodec minor version.
*/
enum AVCodecID {
AV_CODEC_ID_NONE,
/* video codecs */
AV_CODEC_ID_MPEG1VIDEO,
AV_CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
#if FF_API_XVMC
AV_CODEC_ID_MPEG2VIDEO_XVMC,
#endif /* FF_API_XVMC */
AV_CODEC_ID_H261,
AV_CODEC_ID_H263,
AV_CODEC_ID_RV10,
AV_CODEC_ID_RV20,
AV_CODEC_ID_MJPEG,
AV_CODEC_ID_MJPEGB,
AV_CODEC_ID_LJPEG,
AV_CODEC_ID_SP5X,
AV_CODEC_ID_JPEGLS,
AV_CODEC_ID_MPEG4,
AV_CODEC_ID_RAWVIDEO,
AV_CODEC_ID_MSMPEG4V1,
AV_CODEC_ID_MSMPEG4V2,
AV_CODEC_ID_MSMPEG4V3,
AV_CODEC_ID_WMV1,
AV_CODEC_ID_WMV2,
AV_CODEC_ID_H263P,
AV_CODEC_ID_H263I,
AV_CODEC_ID_FLV1,
AV_CODEC_ID_SVQ1,
AV_CODEC_ID_SVQ3,
AV_CODEC_ID_DVVIDEO,
AV_CODEC_ID_HUFFYUV,
AV_CODEC_ID_CYUV,
AV_CODEC_ID_H264,
AV_CODEC_ID_INDEO3,
AV_CODEC_ID_VP3,
AV_CODEC_ID_THEORA,
AV_CODEC_ID_ASV1,
AV_CODEC_ID_ASV2,
AV_CODEC_ID_FFV1,
AV_CODEC_ID_4XM,
AV_CODEC_ID_VCR1,
AV_CODEC_ID_CLJR,
AV_CODEC_ID_MDEC,
AV_CODEC_ID_ROQ,
AV_CODEC_ID_INTERPLAY_VIDEO,
AV_CODEC_ID_XAN_WC3,
AV_CODEC_ID_XAN_WC4,
AV_CODEC_ID_RPZA,
AV_CODEC_ID_CINEPAK,
AV_CODEC_ID_WS_VQA,
AV_CODEC_ID_MSRLE,
AV_CODEC_ID_MSVIDEO1,
AV_CODEC_ID_IDCIN,
AV_CODEC_ID_8BPS,
AV_CODEC_ID_SMC,
AV_CODEC_ID_FLIC,
AV_CODEC_ID_TRUEMOTION1,
AV_CODEC_ID_VMDVIDEO,
AV_CODEC_ID_MSZH,
AV_CODEC_ID_ZLIB,
AV_CODEC_ID_QTRLE,
AV_CODEC_ID_TSCC,
AV_CODEC_ID_ULTI,
AV_CODEC_ID_QDRAW,
AV_CODEC_ID_VIXL,
AV_CODEC_ID_QPEG,
AV_CODEC_ID_PNG,
AV_CODEC_ID_PPM,
AV_CODEC_ID_PBM,
AV_CODEC_ID_PGM,
AV_CODEC_ID_PGMYUV,
AV_CODEC_ID_PAM,
AV_CODEC_ID_FFVHUFF,
AV_CODEC_ID_RV30,
AV_CODEC_ID_RV40,
AV_CODEC_ID_VC1,
AV_CODEC_ID_WMV3,
AV_CODEC_ID_LOCO,
AV_CODEC_ID_WNV1,
AV_CODEC_ID_AASC,
AV_CODEC_ID_INDEO2,
AV_CODEC_ID_FRAPS,
AV_CODEC_ID_TRUEMOTION2,
AV_CODEC_ID_BMP,
AV_CODEC_ID_CSCD,
AV_CODEC_ID_MMVIDEO,
AV_CODEC_ID_ZMBV,
AV_CODEC_ID_AVS,
AV_CODEC_ID_SMACKVIDEO,
AV_CODEC_ID_NUV,
AV_CODEC_ID_KMVC,
AV_CODEC_ID_FLASHSV,
AV_CODEC_ID_CAVS,
AV_CODEC_ID_JPEG2000,
AV_CODEC_ID_VMNC,
AV_CODEC_ID_VP5,
AV_CODEC_ID_VP6,
AV_CODEC_ID_VP6F,
AV_CODEC_ID_TARGA,
AV_CODEC_ID_DSICINVIDEO,
AV_CODEC_ID_TIERTEXSEQVIDEO,
AV_CODEC_ID_TIFF,
AV_CODEC_ID_GIF,
AV_CODEC_ID_DXA,
AV_CODEC_ID_DNXHD,
AV_CODEC_ID_THP,
AV_CODEC_ID_SGI,
AV_CODEC_ID_C93,
AV_CODEC_ID_BETHSOFTVID,
AV_CODEC_ID_PTX,
AV_CODEC_ID_TXD,
AV_CODEC_ID_VP6A,
AV_CODEC_ID_AMV,
AV_CODEC_ID_VB,
AV_CODEC_ID_PCX,
AV_CODEC_ID_SUNRAST,
AV_CODEC_ID_INDEO4,
AV_CODEC_ID_INDEO5,
AV_CODEC_ID_MIMIC,
AV_CODEC_ID_RL2,
AV_CODEC_ID_ESCAPE124,
AV_CODEC_ID_DIRAC,
AV_CODEC_ID_BFI,
AV_CODEC_ID_CMV,
AV_CODEC_ID_MOTIONPIXELS,
AV_CODEC_ID_TGV,
AV_CODEC_ID_TGQ,
AV_CODEC_ID_TQI,
AV_CODEC_ID_AURA,
AV_CODEC_ID_AURA2,
AV_CODEC_ID_V210X,
AV_CODEC_ID_TMV,
AV_CODEC_ID_V210,
AV_CODEC_ID_DPX,
AV_CODEC_ID_MAD,
AV_CODEC_ID_FRWU,
AV_CODEC_ID_FLASHSV2,
AV_CODEC_ID_CDGRAPHICS,
AV_CODEC_ID_R210,
AV_CODEC_ID_ANM,
AV_CODEC_ID_BINKVIDEO,
AV_CODEC_ID_IFF_ILBM,
AV_CODEC_ID_IFF_BYTERUN1,
AV_CODEC_ID_KGV1,
AV_CODEC_ID_YOP,
AV_CODEC_ID_VP8,
AV_CODEC_ID_PICTOR,
AV_CODEC_ID_ANSI,
AV_CODEC_ID_A64_MULTI,
AV_CODEC_ID_A64_MULTI5,
AV_CODEC_ID_R10K,
AV_CODEC_ID_MXPEG,
AV_CODEC_ID_LAGARITH,
AV_CODEC_ID_PRORES,
AV_CODEC_ID_JV,
AV_CODEC_ID_DFA,
AV_CODEC_ID_WMV3IMAGE,
AV_CODEC_ID_VC1IMAGE,
AV_CODEC_ID_UTVIDEO,
AV_CODEC_ID_BMV_VIDEO,
AV_CODEC_ID_VBLE,
AV_CODEC_ID_DXTORY,
AV_CODEC_ID_V410,
AV_CODEC_ID_XWD,
AV_CODEC_ID_CDXL,
AV_CODEC_ID_XBM,
AV_CODEC_ID_ZEROCODEC,
AV_CODEC_ID_MSS1,
AV_CODEC_ID_MSA1,
AV_CODEC_ID_TSCC2,
AV_CODEC_ID_MTS2,
AV_CODEC_ID_CLLC,
AV_CODEC_ID_MSS2,
AV_CODEC_ID_VP9,
AV_CODEC_ID_AIC,
AV_CODEC_ID_ESCAPE130,
AV_CODEC_ID_G2M,
AV_CODEC_ID_WEBP,
AV_CODEC_ID_HNM4_VIDEO,
AV_CODEC_ID_HEVC,
AV_CODEC_ID_FIC,
AV_CODEC_ID_ALIAS_PIX,
AV_CODEC_ID_BRENDER_PIX,
AV_CODEC_ID_PAF_VIDEO,
AV_CODEC_ID_EXR,
AV_CODEC_ID_VP7,
AV_CODEC_ID_SANM,
AV_CODEC_ID_SGIRLE,
AV_CODEC_ID_MVC1,
AV_CODEC_ID_MVC2,
AV_CODEC_ID_HQX,
AV_CODEC_ID_TDSC,
AV_CODEC_ID_HQ_HQA,
AV_CODEC_ID_HAP,
AV_CODEC_ID_DDS,
AV_CODEC_ID_DXV,
AV_CODEC_ID_SCREENPRESSO,
AV_CODEC_ID_RSCC,
AV_CODEC_ID_MAGICYUV,
AV_CODEC_ID_TRUEMOTION2RT,
AV_CODEC_ID_AV1,
/* various PCM "codecs" */
AV_CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
AV_CODEC_ID_PCM_S16LE = 0x10000,
AV_CODEC_ID_PCM_S16BE,
AV_CODEC_ID_PCM_U16LE,
AV_CODEC_ID_PCM_U16BE,
AV_CODEC_ID_PCM_S8,
AV_CODEC_ID_PCM_U8,
AV_CODEC_ID_PCM_MULAW,
AV_CODEC_ID_PCM_ALAW,
AV_CODEC_ID_PCM_S32LE,
AV_CODEC_ID_PCM_S32BE,
AV_CODEC_ID_PCM_U32LE,
AV_CODEC_ID_PCM_U32BE,
AV_CODEC_ID_PCM_S24LE,
AV_CODEC_ID_PCM_S24BE,
AV_CODEC_ID_PCM_U24LE,
AV_CODEC_ID_PCM_U24BE,
AV_CODEC_ID_PCM_S24DAUD,
AV_CODEC_ID_PCM_ZORK,
AV_CODEC_ID_PCM_S16LE_PLANAR,
AV_CODEC_ID_PCM_DVD,
AV_CODEC_ID_PCM_F32BE,
AV_CODEC_ID_PCM_F32LE,
AV_CODEC_ID_PCM_F64BE,
AV_CODEC_ID_PCM_F64LE,
AV_CODEC_ID_PCM_BLURAY,
AV_CODEC_ID_PCM_LXF,
AV_CODEC_ID_S302M,
AV_CODEC_ID_PCM_S8_PLANAR,
AV_CODEC_ID_PCM_S24LE_PLANAR,
AV_CODEC_ID_PCM_S32LE_PLANAR,
AV_CODEC_ID_PCM_S16BE_PLANAR,
/* various ADPCM codecs */
AV_CODEC_ID_ADPCM_IMA_QT = 0x11000,
AV_CODEC_ID_ADPCM_IMA_WAV,
AV_CODEC_ID_ADPCM_IMA_DK3,
AV_CODEC_ID_ADPCM_IMA_DK4,
AV_CODEC_ID_ADPCM_IMA_WS,
AV_CODEC_ID_ADPCM_IMA_SMJPEG,
AV_CODEC_ID_ADPCM_MS,
AV_CODEC_ID_ADPCM_4XM,
AV_CODEC_ID_ADPCM_XA,
AV_CODEC_ID_ADPCM_ADX,
AV_CODEC_ID_ADPCM_EA,
AV_CODEC_ID_ADPCM_G726,
AV_CODEC_ID_ADPCM_CT,
AV_CODEC_ID_ADPCM_SWF,
AV_CODEC_ID_ADPCM_YAMAHA,
AV_CODEC_ID_ADPCM_SBPRO_4,
AV_CODEC_ID_ADPCM_SBPRO_3,
AV_CODEC_ID_ADPCM_SBPRO_2,
AV_CODEC_ID_ADPCM_THP,
AV_CODEC_ID_ADPCM_IMA_AMV,
AV_CODEC_ID_ADPCM_EA_R1,
AV_CODEC_ID_ADPCM_EA_R3,
AV_CODEC_ID_ADPCM_EA_R2,
AV_CODEC_ID_ADPCM_IMA_EA_SEAD,
AV_CODEC_ID_ADPCM_IMA_EA_EACS,
AV_CODEC_ID_ADPCM_EA_XAS,
AV_CODEC_ID_ADPCM_EA_MAXIS_XA,
AV_CODEC_ID_ADPCM_IMA_ISS,
AV_CODEC_ID_ADPCM_G722,
AV_CODEC_ID_ADPCM_IMA_APC,
AV_CODEC_ID_ADPCM_VIMA,
/* AMR */
AV_CODEC_ID_AMR_NB = 0x12000,
AV_CODEC_ID_AMR_WB,
/* RealAudio codecs*/
AV_CODEC_ID_RA_144 = 0x13000,
AV_CODEC_ID_RA_288,
/* various DPCM codecs */
AV_CODEC_ID_ROQ_DPCM = 0x14000,
AV_CODEC_ID_INTERPLAY_DPCM,
AV_CODEC_ID_XAN_DPCM,
AV_CODEC_ID_SOL_DPCM,
/* audio codecs */
AV_CODEC_ID_MP2 = 0x15000,
AV_CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
AV_CODEC_ID_AAC,
AV_CODEC_ID_AC3,
AV_CODEC_ID_DTS,
AV_CODEC_ID_VORBIS,
AV_CODEC_ID_DVAUDIO,
AV_CODEC_ID_WMAV1,
AV_CODEC_ID_WMAV2,
AV_CODEC_ID_MACE3,
AV_CODEC_ID_MACE6,
AV_CODEC_ID_VMDAUDIO,
AV_CODEC_ID_FLAC,
AV_CODEC_ID_MP3ADU,
AV_CODEC_ID_MP3ON4,
AV_CODEC_ID_SHORTEN,
AV_CODEC_ID_ALAC,
AV_CODEC_ID_WESTWOOD_SND1,
AV_CODEC_ID_GSM, ///< as in Berlin toast format
AV_CODEC_ID_QDM2,
AV_CODEC_ID_COOK,
AV_CODEC_ID_TRUESPEECH,
AV_CODEC_ID_TTA,
AV_CODEC_ID_SMACKAUDIO,
AV_CODEC_ID_QCELP,
AV_CODEC_ID_WAVPACK,
AV_CODEC_ID_DSICINAUDIO,
AV_CODEC_ID_IMC,
AV_CODEC_ID_MUSEPACK7,
AV_CODEC_ID_MLP,
AV_CODEC_ID_GSM_MS, /* as found in WAV */
AV_CODEC_ID_ATRAC3,
#if FF_API_VOXWARE
AV_CODEC_ID_VOXWARE,
#endif
AV_CODEC_ID_APE,
AV_CODEC_ID_NELLYMOSER,
AV_CODEC_ID_MUSEPACK8,
AV_CODEC_ID_SPEEX,
AV_CODEC_ID_WMAVOICE,
AV_CODEC_ID_WMAPRO,
AV_CODEC_ID_WMALOSSLESS,
AV_CODEC_ID_ATRAC3P,
AV_CODEC_ID_EAC3,
AV_CODEC_ID_SIPR,
AV_CODEC_ID_MP1,
AV_CODEC_ID_TWINVQ,
AV_CODEC_ID_TRUEHD,
AV_CODEC_ID_MP4ALS,
AV_CODEC_ID_ATRAC1,
AV_CODEC_ID_BINKAUDIO_RDFT,
AV_CODEC_ID_BINKAUDIO_DCT,
AV_CODEC_ID_AAC_LATM,
AV_CODEC_ID_QDMC,
AV_CODEC_ID_CELT,
AV_CODEC_ID_G723_1,
AV_CODEC_ID_G729,
AV_CODEC_ID_8SVX_EXP,
AV_CODEC_ID_8SVX_FIB,
AV_CODEC_ID_BMV_AUDIO,
AV_CODEC_ID_RALF,
AV_CODEC_ID_IAC,
AV_CODEC_ID_ILBC,
AV_CODEC_ID_OPUS,
AV_CODEC_ID_COMFORT_NOISE,
AV_CODEC_ID_TAK,
AV_CODEC_ID_METASOUND,
AV_CODEC_ID_PAF_AUDIO,
AV_CODEC_ID_ON2AVC,
AV_CODEC_ID_DSS_SP,
/* subtitle codecs */
AV_CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
AV_CODEC_ID_DVD_SUBTITLE = 0x17000,
AV_CODEC_ID_DVB_SUBTITLE,
AV_CODEC_ID_TEXT, ///< raw UTF-8 text
AV_CODEC_ID_XSUB,
AV_CODEC_ID_SSA,
AV_CODEC_ID_MOV_TEXT,
AV_CODEC_ID_HDMV_PGS_SUBTITLE,
AV_CODEC_ID_DVB_TELETEXT,
AV_CODEC_ID_SRT,
/* other specific kind of codecs (generally used for attachments) */
AV_CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
AV_CODEC_ID_TTF = 0x18000,
AV_CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like AV_CODEC_ID_NONE) but lavf should attempt to identify it
AV_CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
* stream (only used by libavformat) */
AV_CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems
* stream (only used by libavformat) */
AV_CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information.
AV_CODEC_ID_WRAPPED_AVFRAME = 0x21001, ///< Passthrough codec, AVFrames wrapped in AVPacket
};
/**
* This struct describes the properties of a single codec described by an
* AVCodecID.
* @see avcodec_descriptor_get()
*/
typedef struct AVCodecDescriptor {
enum AVCodecID id;
enum AVMediaType type;
/**
* Name of the codec described by this descriptor. It is non-empty and
* unique for each codec descriptor. It should contain alphanumeric
* characters and '_' only.
*/
const char *name;
/**
* A more descriptive name for this codec. May be NULL.
*/
const char *long_name;
/**
* Codec properties, a combination of AV_CODEC_PROP_* flags.
*/
int props;
/**
* If non-NULL, an array of profiles recognized for this codec.
* Terminated with FF_PROFILE_UNKNOWN.
*/
const struct AVProfile *profiles;
} AVCodecDescriptor;
/**
* Codec uses only intra compression.
* Video codecs only.
*/
#define AV_CODEC_PROP_INTRA_ONLY (1 << 0)
/**
* Codec supports lossy compression. Audio and video codecs only.
* @note a codec may support both lossy and lossless
* compression modes
*/
#define AV_CODEC_PROP_LOSSY (1 << 1)
/**
* Codec supports lossless compression. Audio and video codecs only.
*/
#define AV_CODEC_PROP_LOSSLESS (1 << 2)
/**
* Codec supports frame reordering. That is, the coded order (the order in which
* the encoded packets are output by the encoders / stored / input to the
* decoders) may be different from the presentation order of the corresponding
* frames.
*
* For codecs that do not have this property set, PTS and DTS should always be
* equal.
*/
#define AV_CODEC_PROP_REORDER (1 << 3)
/**
* @ingroup lavc_decoding
* Required number of additionally allocated bytes at the end of the input bitstream for decoding.
* This is mainly needed because some optimized bitstream readers read
* 32 or 64 bit at once and could read over the end.<br>
* Note: If the first 23 bits of the additional bytes are not 0, then damaged
* MPEG bitstreams could cause overread and segfault.
*/
#define AV_INPUT_BUFFER_PADDING_SIZE 8
/**
* @ingroup lavc_encoding
* minimum encoding buffer size
* Used to avoid some checks during header writing.
*/
#define AV_INPUT_BUFFER_MIN_SIZE 16384
#if FF_API_WITHOUT_PREFIX
/**
* @deprecated use AV_INPUT_BUFFER_PADDING_SIZE instead
*/
#define FF_INPUT_BUFFER_PADDING_SIZE 8
/**
* @deprecated use AV_INPUT_BUFFER_MIN_SIZE instead
*/
#define FF_MIN_BUFFER_SIZE 16384
#endif /* FF_API_WITHOUT_PREFIX */
/**
* @ingroup lavc_encoding
* motion estimation type.
* @deprecated use codec private option instead
*/
#if FF_API_MOTION_EST
enum Motion_Est_ID {
ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
ME_FULL,
ME_LOG,
ME_PHODS,
ME_EPZS, ///< enhanced predictive zonal search
ME_X1, ///< reserved for experiments
ME_HEX, ///< hexagon based search
ME_UMH, ///< uneven multi-hexagon search
ME_TESA, ///< transformed exhaustive search algorithm
};
#endif
/**
* @ingroup lavc_decoding
*/
enum AVDiscard{
/* We leave some space between them for extensions (drop some
* keyframes for intra-only or drop just some bidir frames). */
AVDISCARD_NONE =-16, ///< discard nothing
AVDISCARD_DEFAULT = 0, ///< discard useless packets like 0 size packets in avi
AVDISCARD_NONREF = 8, ///< discard all non reference
AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
AVDISCARD_ALL = 48, ///< discard all
};
enum AVAudioServiceType {
AV_AUDIO_SERVICE_TYPE_MAIN = 0,
AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
};
/**
* @ingroup lavc_encoding
*/
typedef struct RcOverride{
int start_frame;
int end_frame;
int qscale; // If this is 0 then quality_factor will be used instead.
float quality_factor;
} RcOverride;
#if FF_API_MAX_BFRAMES
/**
* @deprecated there is no libavcodec-wide limit on the number of B-frames
*/
#define FF_MAX_B_FRAMES 16
#endif
/* encoding support
These flags can be passed in AVCodecContext.flags before initialization.
Note: Not everything is supported yet.
*/
/**
* Allow decoders to produce frames with data planes that are not aligned
* to CPU requirements (e.g. due to cropping).
*/
#define AV_CODEC_FLAG_UNALIGNED (1 << 0)
/**
* Use fixed qscale.
*/
#define AV_CODEC_FLAG_QSCALE (1 << 1)
/**
* 4 MV per MB allowed / advanced prediction for H.263.
*/
#define AV_CODEC_FLAG_4MV (1 << 2)
/**
* Output even those frames that might be corrupted.
*/
#define AV_CODEC_FLAG_OUTPUT_CORRUPT (1 << 3)
/**
* Use qpel MC.
*/
#define AV_CODEC_FLAG_QPEL (1 << 4)
/**
* Use internal 2pass ratecontrol in first pass mode.
*/
#define AV_CODEC_FLAG_PASS1 (1 << 9)
/**
* Use internal 2pass ratecontrol in second pass mode.
*/
#define AV_CODEC_FLAG_PASS2 (1 << 10)
/**
* loop filter.
*/
#define AV_CODEC_FLAG_LOOP_FILTER (1 << 11)
/**
* Only decode/encode grayscale.
*/
#define AV_CODEC_FLAG_GRAY (1 << 13)
/**
* error[?] variables will be set during encoding.
*/
#define AV_CODEC_FLAG_PSNR (1 << 15)
/**
* Input bitstream might be truncated at a random location
* instead of only at frame boundaries.
*/
#define AV_CODEC_FLAG_TRUNCATED (1 << 16)
/**
* Use interlaced DCT.
*/
#define AV_CODEC_FLAG_INTERLACED_DCT (1 << 18)
/**
* Force low delay.
*/
#define AV_CODEC_FLAG_LOW_DELAY (1 << 19)
/**
* Place global headers in extradata instead of every keyframe.
*/
#define AV_CODEC_FLAG_GLOBAL_HEADER (1 << 22)
/**
* Use only bitexact stuff (except (I)DCT).
*/
#define AV_CODEC_FLAG_BITEXACT (1 << 23)
/* Fx : Flag for H.263+ extra options */
/**
* H.263 advanced intra coding / MPEG-4 AC prediction
*/
#define AV_CODEC_FLAG_AC_PRED (1 << 24)
/**
* interlaced motion estimation
*/
#define AV_CODEC_FLAG_INTERLACED_ME (1 << 29)
#define AV_CODEC_FLAG_CLOSED_GOP (1 << 31)
/**
* Allow non spec compliant speedup tricks.
*/
#define AV_CODEC_FLAG2_FAST (1 << 0)
/**
* Skip bitstream encoding.
*/
#define AV_CODEC_FLAG2_NO_OUTPUT (1 << 2)
/**
* Place global headers at every keyframe instead of in extradata.
*/
#define AV_CODEC_FLAG2_LOCAL_HEADER (1 << 3)
/**
* Input bitstream might be truncated at a packet boundaries
* instead of only at frame boundaries.
*/
#define AV_CODEC_FLAG2_CHUNKS (1 << 15)
/**
* Discard cropping information from SPS.
*/
#define AV_CODEC_FLAG2_IGNORE_CROP (1 << 16)
/* Unsupported options :
* Syntax Arithmetic coding (SAC)
* Reference Picture Selection
* Independent Segment Decoding */
/* /Fx */
/* codec capabilities */
/**
* Decoder can use draw_horiz_band callback.
*/
#define AV_CODEC_CAP_DRAW_HORIZ_BAND (1 << 0)
/**
* Codec uses get_buffer() for allocating buffers and supports custom allocators.
* If not set, it might not use get_buffer() at all or use operations that
* assume the buffer was allocated by avcodec_default_get_buffer.
*/
#define AV_CODEC_CAP_DR1 (1 << 1)
#define AV_CODEC_CAP_TRUNCATED (1 << 3)
/**
* Encoder or decoder requires flushing with NULL input at the end in order to
* give the complete and correct output.
*
* NOTE: If this flag is not set, the codec is guaranteed to never be fed with
* with NULL data. The user can still send NULL data to the public encode
* or decode function, but libavcodec will not pass it along to the codec
* unless this flag is set.
*
* Decoders:
* The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
* avpkt->size=0 at the end to get the delayed data until the decoder no longer
* returns frames.
*
* Encoders:
* The encoder needs to be fed with NULL data at the end of encoding until the
* encoder no longer returns data.
*
* NOTE: For encoders implementing the AVCodec.encode2() function, setting this
* flag also means that the encoder must set the pts and duration for
* each output packet. If this flag is not set, the pts and duration will
* be determined by libavcodec from the input frame.
*/
#define AV_CODEC_CAP_DELAY (1 << 5)
/**
* Codec can be fed a final frame with a smaller size.
* This can be used to prevent truncation of the last audio samples.
*/
#define AV_CODEC_CAP_SMALL_LAST_FRAME (1 << 6)
/**
* Codec can output multiple frames per AVPacket
* Normally demuxers return one frame at a time, demuxers which do not do
* are connected to a parser to split what they return into proper frames.
* This flag is reserved to the very rare category of codecs which have a
* bitstream that cannot be split into frames without timeconsuming
* operations like full decoding. Demuxers carrying such bitstreams thus
* may return multiple frames in a packet. This has many disadvantages like
* prohibiting stream copy in many cases thus it should only be considered
* as a last resort.
*/
#define AV_CODEC_CAP_SUBFRAMES (1 << 8)
/**
* Codec is experimental and is thus avoided in favor of non experimental
* encoders
*/
#define AV_CODEC_CAP_EXPERIMENTAL (1 << 9)
/**
* Codec should fill in channel configuration and samplerate instead of container
*/
#define AV_CODEC_CAP_CHANNEL_CONF (1 << 10)
/**
* Codec supports frame-level multithreading.
*/
#define AV_CODEC_CAP_FRAME_THREADS (1 << 12)
/**
* Codec supports slice-based (or partition-based) multithreading.
*/
#define AV_CODEC_CAP_SLICE_THREADS (1 << 13)
/**
* Codec supports changed parameters at any point.
*/
#define AV_CODEC_CAP_PARAM_CHANGE (1 << 14)
/**
* Codec supports avctx->thread_count == 0 (auto).
*/
#define AV_CODEC_CAP_AUTO_THREADS (1 << 15)
/**
* Audio encoder supports receiving a different number of samples in each call.
*/
#define AV_CODEC_CAP_VARIABLE_FRAME_SIZE (1 << 16)
#if FF_API_WITHOUT_PREFIX
/**
* Allow decoders to produce frames with data planes that are not aligned
* to CPU requirements (e.g. due to cropping).
*/
#define CODEC_FLAG_UNALIGNED 0x0001
#define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
#define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
#define CODEC_FLAG_OUTPUT_CORRUPT 0x0008 ///< Output even those frames that might be corrupted
#define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
#if FF_API_GMC
/**
* @deprecated use the "gmc" private option of the libxvid encoder
*/
#define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
#endif
#if FF_API_MV0
/**
* @deprecated use the flag "mv0" in the "mpv_flags" private option of the
* mpegvideo encoders
*/
#define CODEC_FLAG_MV0 0x0040
#endif
#if FF_API_INPUT_PRESERVED
/**
* @deprecated passing reference-counted frames to the encoders replaces this
* flag
*/
#define CODEC_FLAG_INPUT_PRESERVED 0x0100
#endif
#define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
#define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
#define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
#if FF_API_EMU_EDGE
/**
* @deprecated edges are not used/required anymore. I.e. this flag is now always
* set.
*/
#define CODEC_FLAG_EMU_EDGE 0x4000
#endif
#define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
#define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
location instead of only at frame boundaries. */
#if FF_API_NORMALIZE_AQP
/**
* @deprecated use the flag "naq" in the "mpv_flags" private option of the
* mpegvideo encoders
*/
#define CODEC_FLAG_NORMALIZE_AQP 0x00020000
#endif
#define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
#define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
#define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
#define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
/* Fx : Flag for H.263+ extra options */
#define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
#define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
#define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
#define CODEC_FLAG_CLOSED_GOP 0x80000000
#define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
#define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
#define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
#define CODEC_FLAG2_IGNORE_CROP 0x00010000 ///< Discard cropping information from SPS.
#define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
/* Unsupported options :
* Syntax Arithmetic coding (SAC)
* Reference Picture Selection
* Independent Segment Decoding */
/* /Fx */
/* codec capabilities */
#define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
/**
* Codec uses get_buffer() for allocating buffers and supports custom allocators.
* If not set, it might not use get_buffer() at all or use operations that
* assume the buffer was allocated by avcodec_default_get_buffer.
*/
#define CODEC_CAP_DR1 0x0002
#define CODEC_CAP_TRUNCATED 0x0008
#if FF_API_XVMC
/* Codec can export data for HW decoding (XvMC). */
#define CODEC_CAP_HWACCEL 0x0010
#endif /* FF_API_XVMC */
/**
* Encoder or decoder requires flushing with NULL input at the end in order to
* give the complete and correct output.
*
* NOTE: If this flag is not set, the codec is guaranteed to never be fed with
* with NULL data. The user can still send NULL data to the public encode
* or decode function, but libavcodec will not pass it along to the codec
* unless this flag is set.
*
* Decoders:
* The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
* avpkt->size=0 at the end to get the delayed data until the decoder no longer
* returns frames.
*
* Encoders:
* The encoder needs to be fed with NULL data at the end of encoding until the
* encoder no longer returns data.
*
* NOTE: For encoders implementing the AVCodec.encode2() function, setting this
* flag also means that the encoder must set the pts and duration for
* each output packet. If this flag is not set, the pts and duration will
* be determined by libavcodec from the input frame.
*/
#define CODEC_CAP_DELAY 0x0020
/**
* Codec can be fed a final frame with a smaller size.
* This can be used to prevent truncation of the last audio samples.
*/
#define CODEC_CAP_SMALL_LAST_FRAME 0x0040
#if FF_API_CAP_VDPAU
/**
* Codec can export data for HW decoding (VDPAU).
*/
#define CODEC_CAP_HWACCEL_VDPAU 0x0080
#endif
/**
* Codec can output multiple frames per AVPacket
* Normally demuxers return one frame at a time, demuxers which do not do
* are connected to a parser to split what they return into proper frames.
* This flag is reserved to the very rare category of codecs which have a
* bitstream that cannot be split into frames without timeconsuming
* operations like full decoding. Demuxers carrying such bitstreams thus
* may return multiple frames in a packet. This has many disadvantages like
* prohibiting stream copy in many cases thus it should only be considered
* as a last resort.
*/
#define CODEC_CAP_SUBFRAMES 0x0100
/**
* Codec is experimental and is thus avoided in favor of non experimental
* encoders
*/
#define CODEC_CAP_EXPERIMENTAL 0x0200
/**
* Codec should fill in channel configuration and samplerate instead of container
*/
#define CODEC_CAP_CHANNEL_CONF 0x0400
#if FF_API_NEG_LINESIZES
/**
* @deprecated no codecs use this capability
*/
#define CODEC_CAP_NEG_LINESIZES 0x0800
#endif
/**
* Codec supports frame-level multithreading.
*/
#define CODEC_CAP_FRAME_THREADS 0x1000
/**
* Codec supports slice-based (or partition-based) multithreading.
*/
#define CODEC_CAP_SLICE_THREADS 0x2000
/**
* Codec supports changed parameters at any point.
*/
#define CODEC_CAP_PARAM_CHANGE 0x4000
/**
* Codec supports avctx->thread_count == 0 (auto).
*/
#define CODEC_CAP_AUTO_THREADS 0x8000
/**
* Audio encoder supports receiving a different number of samples in each call.
*/
#define CODEC_CAP_VARIABLE_FRAME_SIZE 0x10000
#endif /* FF_API_WITHOUT_PREFIX */
#if FF_API_MB_TYPE
//The following defines may change, don't expect compatibility if you use them.
#define MB_TYPE_INTRA4x4 0x0001
#define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
#define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
#define MB_TYPE_16x16 0x0008
#define MB_TYPE_16x8 0x0010
#define MB_TYPE_8x16 0x0020
#define MB_TYPE_8x8 0x0040
#define MB_TYPE_INTERLACED 0x0080
#define MB_TYPE_DIRECT2 0x0100 //FIXME
#define MB_TYPE_ACPRED 0x0200
#define MB_TYPE_GMC 0x0400
#define MB_TYPE_SKIP 0x0800
#define MB_TYPE_P0L0 0x1000
#define MB_TYPE_P1L0 0x2000
#define MB_TYPE_P0L1 0x4000
#define MB_TYPE_P1L1 0x8000
#define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
#define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
#define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
#define MB_TYPE_QUANT 0x00010000
#define MB_TYPE_CBP 0x00020000
// Note bits 24-31 are reserved for codec specific use (H.264 ref0, MPEG-1 0mv, ...)
#endif
/**
* Pan Scan area.
* This specifies the area which should be displayed.
* Note there may be multiple such areas for one frame.
*/
typedef struct AVPanScan{
/**
* id
* - encoding: Set by user.
* - decoding: Set by libavcodec.
*/
int id;
/**
* width and height in 1/16 pel
* - encoding: Set by user.
* - decoding: Set by libavcodec.
*/
int width;
int height;
/**
* position of the top left corner in 1/16 pel for up to 3 fields/frames
* - encoding: Set by user.
* - decoding: Set by libavcodec.
*/
int16_t position[3][2];
}AVPanScan;
/**
* This structure describes the bitrate properties of an encoded bitstream. It
* roughly corresponds to a subset the VBV parameters for MPEG-2 or HRD
* parameters for H.264/HEVC.
*/
typedef struct AVCPBProperties {
/**
* Maximum bitrate of the stream, in bits per second.
* Zero if unknown or unspecified.
*/
int max_bitrate;
/**
* Minimum bitrate of the stream, in bits per second.
* Zero if unknown or unspecified.
*/
int min_bitrate;
/**
* Average bitrate of the stream, in bits per second.
* Zero if unknown or unspecified.
*/
int avg_bitrate;
/**
* The size of the buffer to which the ratecontrol is applied, in bits.
* Zero if unknown or unspecified.
*/
int buffer_size;
/**
* The delay between the time the packet this structure is associated with
* is received and the time when it should be decoded, in periods of a 27MHz
* clock.
*
* UINT64_MAX when unknown or unspecified.
*/
uint64_t vbv_delay;
} AVCPBProperties;
#if FF_API_QSCALE_TYPE
#define FF_QSCALE_TYPE_MPEG1 0
#define FF_QSCALE_TYPE_MPEG2 1
#define FF_QSCALE_TYPE_H264 2
#define FF_QSCALE_TYPE_VP56 3
#endif
/**
* The decoder will keep a reference to the frame and may reuse it later.
*/
#define AV_GET_BUFFER_FLAG_REF (1 << 0)
/**
* @defgroup lavc_packet AVPacket
*
* Types and functions for working with AVPacket.
* @{
*/
enum AVPacketSideDataType {
/**
* An AV_PKT_DATA_PALETTE side data packet contains exactly AVPALETTE_SIZE
* bytes worth of palette. This side data signals that a new palette is
* present.
*/
AV_PKT_DATA_PALETTE,
/**
* The AV_PKT_DATA_NEW_EXTRADATA is used to notify the codec or the format
* that the extradata buffer was changed and the receiving side should
* act upon it appropriately. The new extradata is embedded in the side
* data buffer and should be immediately used for processing the current
* frame or packet.
*/
AV_PKT_DATA_NEW_EXTRADATA,
/**
* An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
* @code
* u32le param_flags
* if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT)
* s32le channel_count
* if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT)
* u64le channel_layout
* if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE)
* s32le sample_rate
* if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
* s32le width
* s32le height
* @endcode
*/
AV_PKT_DATA_PARAM_CHANGE,
/**
* An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of
* structures with info about macroblocks relevant to splitting the
* packet into smaller packets on macroblock edges (e.g. as for RFC 2190).
* That is, it does not necessarily contain info about all macroblocks,
* as long as the distance between macroblocks in the info is smaller
* than the target payload size.
* Each MB info structure is 12 bytes, and is laid out as follows:
* @code
* u32le bit offset from the start of the packet
* u8 current quantizer at the start of the macroblock
* u8 GOB number
* u16le macroblock address within the GOB
* u8 horizontal MV predictor
* u8 vertical MV predictor
* u8 horizontal MV predictor for block number 3
* u8 vertical MV predictor for block number 3
* @endcode
*/
AV_PKT_DATA_H263_MB_INFO,
/**
* This side data should be associated with an audio stream and contains
* ReplayGain information in form of the AVReplayGain struct.
*/
AV_PKT_DATA_REPLAYGAIN,
/**
* This side data contains a 3x3 transformation matrix describing an affine
* transformation that needs to be applied to the decoded video frames for
* correct presentation.
*
* See libavutil/display.h for a detailed description of the data.
*/
AV_PKT_DATA_DISPLAYMATRIX,
/**
* This side data should be associated with a video stream and contains
* Stereoscopic 3D information in form of the AVStereo3D struct.
*/
AV_PKT_DATA_STEREO3D,
/**
* This side data should be associated with an audio stream and corresponds
* to enum AVAudioServiceType.
*/
AV_PKT_DATA_AUDIO_SERVICE_TYPE,
/**
* This side data contains an integer value representing the quality
* factor of the compressed frame. Allowed range is between 1 (good)
* and FF_LAMBDA_MAX (bad).
*/
AV_PKT_DATA_QUALITY_FACTOR,
/**
* This side data contains an integer value representing the stream index
* of a "fallback" track. A fallback track indicates an alternate
* track to use when the current track can not be decoded for some reason.
* e.g. no decoder available for codec.
*/
AV_PKT_DATA_FALLBACK_TRACK,
/**
* This side data corresponds to the AVCPBProperties struct.
*/
AV_PKT_DATA_CPB_PROPERTIES,
/**
* This side data should be associated with a video stream and corresponds
* to the AVSphericalMapping structure.
*/
AV_PKT_DATA_SPHERICAL,
};
typedef struct AVPacketSideData {
uint8_t *data;
int size;
enum AVPacketSideDataType type;
} AVPacketSideData;
/**
* This structure stores compressed data. It is typically exported by demuxers
* and then passed as input to decoders, or received as output from encoders and
* then passed to muxers.
*
* For video, it should typically contain one compressed frame. For audio it may
* contain several compressed frames. Encoders are allowed to output empty
* packets, with no compressed data, containing only side data
* (e.g. to update some stream parameters at the end of encoding).
*
* AVPacket is one of the few structs in Libav, whose size is a part of public
* ABI. Thus it may be allocated on stack and no new fields can be added to it
* without libavcodec and libavformat major bump.
*
* The semantics of data ownership depends on the buf field.
* If it is set, the packet data is dynamically allocated and is
* valid indefinitely until a call to av_packet_unref() reduces the
* reference count to 0.
*
* If the buf field is not set av_packet_ref() would make a copy instead
* of increasing the reference count.
*
* The side data is always allocated with av_malloc(), copied by
* av_packet_ref() and freed by av_packet_unref().
*
* @see av_packet_ref
* @see av_packet_unref
*/
typedef struct AVPacket {
/**
* A reference to the reference-counted buffer where the packet data is
* stored.
* May be NULL, then the packet data is not reference-counted.
*/
AVBufferRef *buf;
/**
* Presentation timestamp in AVStream->time_base units; the time at which
* the decompressed packet will be presented to the user.
* Can be AV_NOPTS_VALUE if it is not stored in the file.
* pts MUST be larger or equal to dts as presentation cannot happen before
* decompression, unless one wants to view hex dumps. Some formats misuse
* the terms dts and pts/cts to mean something different. Such timestamps
* must be converted to true pts/dts before they are stored in AVPacket.
*/
int64_t pts;
/**
* Decompression timestamp in AVStream->time_base units; the time at which
* the packet is decompressed.
* Can be AV_NOPTS_VALUE if it is not stored in the file.
*/
int64_t dts;
uint8_t *data;
int size;
int stream_index;
/**
* A combination of AV_PKT_FLAG values
*/
int flags;
/**
* Additional packet data that can be provided by the container.
* Packet can contain several types of side information.
*/
AVPacketSideData *side_data;
int side_data_elems;
/**
* Duration of this packet in AVStream->time_base units, 0 if unknown.
* Equals next_pts - this_pts in presentation order.
*/
int64_t duration;
int64_t pos; ///< byte position in stream, -1 if unknown
#if FF_API_CONVERGENCE_DURATION
/**
* @deprecated Same as the duration field, but as int64_t. This was required
* for Matroska subtitles, whose duration values could overflow when the
* duration field was still an int.
*/
attribute_deprecated
int64_t convergence_duration;
#endif
} AVPacket;
#define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
#define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
enum AVSideDataParamChangeFlags {
AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT = 0x0001,
AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002,
AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE = 0x0004,
AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS = 0x0008,
};
/**
* @}
*/
struct AVCodecInternal;
enum AVFieldOrder {
AV_FIELD_UNKNOWN,
AV_FIELD_PROGRESSIVE,
AV_FIELD_TT, //< Top coded_first, top displayed first
AV_FIELD_BB, //< Bottom coded first, bottom displayed first
AV_FIELD_TB, //< Top coded first, bottom displayed first
AV_FIELD_BT, //< Bottom coded first, top displayed first
};
/**
* main external API structure.
* New fields can be added to the end with minor version bumps.
* Removal, reordering and changes to existing fields require a major
* version bump.
* sizeof(AVCodecContext) must not be used outside libav*.
*/
typedef struct AVCodecContext {
/**
* information on struct for av_log
* - set by avcodec_alloc_context3
*/
const AVClass *av_class;
int log_level_offset;
enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
const struct AVCodec *codec;
#if FF_API_CODEC_NAME
/**
* @deprecated this field is not used for anything in libavcodec
*/
attribute_deprecated
char codec_name[32];
#endif
enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */
/**
* fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
* This is used to work around some encoder bugs.
* A demuxer should set this to what is stored in the field used to identify the codec.
* If there are multiple such fields in a container then the demuxer should choose the one
* which maximizes the information about the used codec.
* If the codec tag field in a container is larger than 32 bits then the demuxer should
* remap the longer ID to 32 bits with a table or other structure. Alternatively a new
* extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
* first.
* - encoding: Set by user, if not then the default based on codec_id will be used.
* - decoding: Set by user, will be converted to uppercase by libavcodec during init.
*/
unsigned int codec_tag;
#if FF_API_STREAM_CODEC_TAG
/**
* @deprecated this field is unused
*/
attribute_deprecated
unsigned int stream_codec_tag;
#endif
void *priv_data;
/**
* Private context used for internal data.
*
* Unlike priv_data, this is not codec-specific. It is used in general
* libavcodec functions.
*/
struct AVCodecInternal *internal;
/**
* Private data of the user, can be used to carry app specific stuff.
* - encoding: Set by user.
* - decoding: Set by user.
*/
void *opaque;
/**
* the average bitrate
* - encoding: Set by user; unused for constant quantizer encoding.
* - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
*/
int bit_rate;
/**
* number of bits the bitstream is allowed to diverge from the reference.
* the reference can be CBR (for CBR pass1) or VBR (for pass2)
* - encoding: Set by user; unused for constant quantizer encoding.
* - decoding: unused
*/
int bit_rate_tolerance;
/**
* Global quality for codecs which cannot change it per frame.
* This should be proportional to MPEG-1/2/4 qscale.
* - encoding: Set by user.
* - decoding: unused
*/
int global_quality;
/**
* - encoding: Set by user.
* - decoding: unused
*/
int compression_level;
#define FF_COMPRESSION_DEFAULT -1
/**
* AV_CODEC_FLAG_*.
* - encoding: Set by user.
* - decoding: Set by user.
*/
int flags;
/**
* AV_CODEC_FLAG2_*
* - encoding: Set by user.
* - decoding: Set by user.
*/
int flags2;
/**
* some codecs need / can use extradata like Huffman tables.
* MJPEG: Huffman tables
* rv10: additional flags
* MPEG-4: global headers (they can be in the bitstream or here)
* The allocated memory should be AV_INPUT_BUFFER_PADDING_SIZE bytes larger
* than extradata_size to avoid problems if it is read with the bitstream reader.
* The bytewise contents of extradata must not depend on the architecture or CPU endianness.
* - encoding: Set/allocated/freed by libavcodec.
* - decoding: Set/allocated/freed by user.
*/
uint8_t *extradata;
int extradata_size;
/**
* This is the fundamental unit of time (in seconds) in terms
* of which frame timestamps are represented. For fixed-fps content,
* timebase should be 1/framerate and timestamp increments should be
* identically 1.
* - encoding: MUST be set by user.
* - decoding: the use of this field for decoding is deprecated.
* Use framerate instead.
*/
AVRational time_base;
/**
* For some codecs, the time base is closer to the field rate than the frame rate.
* Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
* if no telecine is used ...
*
* Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
*/
int ticks_per_frame;
/**
* Codec delay.
*
* Video:
* Number of frames the decoded output will be delayed relative to the
* encoded input.
*
* Audio:
* For encoding, this field is unused (see initial_padding).
*
* For decoding, this is the number of samples the decoder needs to
* output before the decoder's output is valid. When seeking, you should
* start decoding this many samples prior to your desired seek point.
*
* - encoding: Set by libavcodec.
* - decoding: Set by libavcodec.
*/
int delay;
/* video only */
/**
* picture width / height.
*
* @note Those fields may not match the values of the last
* AVFrame output by avcodec_decode_video2 due frame
* reordering.
*
* - encoding: MUST be set by user.
* - decoding: May be set by the user before opening the decoder if known e.g.
* from the container. Some decoders will require the dimensions
* to be set by the caller. During decoding, the decoder may
* overwrite those values as required while parsing the data.
*/
int width, height;
/**
* Bitstream width / height, may be different from width/height e.g. when
* the decoded frame is cropped before being output.
*
* @note Those field may not match the value of the last
* AVFrame output by avcodec_receive_frame() due frame
* reordering.
*
* - encoding: unused
* - decoding: May be set by the user before opening the decoder if known
* e.g. from the container. During decoding, the decoder may
* overwrite those values as required while parsing the data.
*/
int coded_width, coded_height;
#if FF_API_ASPECT_EXTENDED
#define FF_ASPECT_EXTENDED 15
#endif
/**
* the number of pictures in a group of pictures, or 0 for intra_only
* - encoding: Set by user.
* - decoding: unused
*/
int gop_size;
/**
* Pixel format, see AV_PIX_FMT_xxx.
* May be set by the demuxer if known from headers.
* May be overridden by the decoder if it knows better.
*
* @note This field may not match the value of the last
* AVFrame output by avcodec_receive_frame() due frame
* reordering.
*
* - encoding: Set by user.
* - decoding: Set by user if known, overridden by libavcodec while
* parsing the data.
*/
enum AVPixelFormat pix_fmt;
#if FF_API_MOTION_EST
/**
* This option does nothing
* @deprecated use codec private options instead
*/
attribute_deprecated int me_method;
#endif
/**
* If non NULL, 'draw_horiz_band' is called by the libavcodec
* decoder to draw a horizontal band. It improves cache usage. Not
* all codecs can do that. You must check the codec capabilities
* beforehand.
* When multithreading is used, it may be called from multiple threads
* at the same time; threads might draw different parts of the same AVFrame,
* or multiple AVFrames, and there is no guarantee that slices will be drawn
* in order.
* The function is also used by hardware acceleration APIs.
* It is called at least once during frame decoding to pass
* the data needed for hardware render.
* In that mode instead of pixel data, AVFrame points to
* a structure specific to the acceleration API. The application
* reads the structure and can change some fields to indicate progress
* or mark state.
* - encoding: unused
* - decoding: Set by user.
* @param height the height of the slice
* @param y the y position of the slice
* @param type 1->top field, 2->bottom field, 3->frame
* @param offset offset into the AVFrame.data from which the slice should be read
*/
void (*draw_horiz_band)(struct AVCodecContext *s,
const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
int y, int type, int height);
/**
* callback to negotiate the pixelFormat
* @param fmt is the list of formats which are supported by the codec,
* it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
* The first is always the native one.
* @note The callback may be called again immediately if initialization for
* the selected (hardware-accelerated) pixel format failed.
* @warning Behavior is undefined if the callback returns a value not
* in the fmt list of formats.
* @return the chosen format
* - encoding: unused
* - decoding: Set by user, if not set the native format will be chosen.
*/
enum AVPixelFormat (*get_format)(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
/**
* maximum number of B-frames between non-B-frames
* Note: The output will be delayed by max_b_frames+1 relative to the input.
* - encoding: Set by user.
* - decoding: unused
*/
int max_b_frames;
/**
* qscale factor between IP and B-frames
* If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
* If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
* - encoding: Set by user.
* - decoding: unused
*/
float b_quant_factor;
#if FF_API_RC_STRATEGY
/** @deprecated use codec private option instead */
attribute_deprecated int rc_strategy;
#define FF_RC_STRATEGY_XVID 1
#endif
#if FF_API_PRIVATE_OPT
/** @deprecated use encoder private options instead */
attribute_deprecated
int b_frame_strategy;
#endif
/**
* qscale offset between IP and B-frames
* - encoding: Set by user.
* - decoding: unused
*/
float b_quant_offset;
/**
* Size of the frame reordering buffer in the decoder.
* For MPEG-2 it is 1 IPB or 0 low delay IP.
* - encoding: Set by libavcodec.
* - decoding: Set by libavcodec.
*/
int has_b_frames;
#if FF_API_PRIVATE_OPT
/** @deprecated use encoder private options instead */
attribute_deprecated
int mpeg_quant;
#endif
/**
* qscale factor between P- and I-frames
* If > 0 then the last P-frame quantizer will be used (q = lastp_q * factor + offset).
* If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
* - encoding: Set by user.
* - decoding: unused
*/
float i_quant_factor;
/**
* qscale offset between P and I-frames
* - encoding: Set by user.
* - decoding: unused
*/
float i_quant_offset;
/**
* luminance masking (0-> disabled)
* - encoding: Set by user.
* - decoding: unused
*/
float lumi_masking;
/**
* temporary complexity masking (0-> disabled)
* - encoding: Set by user.
* - decoding: unused
*/
float temporal_cplx_masking;
/**
* spatial complexity masking (0-> disabled)
* - encoding: Set by user.
* - decoding: unused
*/
float spatial_cplx_masking;
/**
* p block masking (0-> disabled)
* - encoding: Set by user.
* - decoding: unused
*/
float p_masking;
/**
* darkness masking (0-> disabled)
* - encoding: Set by user.
* - decoding: unused
*/
float dark_masking;
/**
* slice count
* - encoding: Set by libavcodec.
* - decoding: Set by user (or 0).
*/
int slice_count;
#if FF_API_PRIVATE_OPT
/** @deprecated use encoder private options instead */
attribute_deprecated
int prediction_method;
#define FF_PRED_LEFT 0
#define FF_PRED_PLANE 1
#define FF_PRED_MEDIAN 2
#endif
/**
* slice offsets in the frame in bytes
* - encoding: Set/allocated by libavcodec.
* - decoding: Set/allocated by user (or NULL).
*/
int *slice_offset;
/**
* sample aspect ratio (0 if unknown)
* That is the width of a pixel divided by the height of the pixel.
* Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
* - encoding: Set by user.
* - decoding: Set by libavcodec.
*/
AVRational sample_aspect_ratio;
/**
* motion estimation comparison function
* - encoding: Set by user.
* - decoding: unused
*/
int me_cmp;
/**
* subpixel motion estimation comparison function
* - encoding: Set by user.
* - decoding: unused
*/
int me_sub_cmp;
/**
* macroblock comparison function (not supported yet)
* - encoding: Set by user.
* - decoding: unused
*/
int mb_cmp;
/**
* interlaced DCT comparison function
* - encoding: Set by user.
* - decoding: unused
*/
int ildct_cmp;
#define FF_CMP_SAD 0
#define FF_CMP_SSE 1
#define FF_CMP_SATD 2
#define FF_CMP_DCT 3
#define FF_CMP_PSNR 4
#define FF_CMP_BIT 5
#define FF_CMP_RD 6
#define FF_CMP_ZERO 7
#define FF_CMP_VSAD 8
#define FF_CMP_VSSE 9
#define FF_CMP_NSSE 10
#define FF_CMP_DCTMAX 13
#define FF_CMP_DCT264 14
#define FF_CMP_CHROMA 256
/**
* ME diamond size & shape
* - encoding: Set by user.
* - decoding: unused
*/
int dia_size;
/**
* amount of previous MV predictors (2a+1 x 2a+1 square)
* - encoding: Set by user.
* - decoding: unused
*/
int last_predictor_count;
#if FF_API_PRIVATE_OPT
/** @deprecated use encoder private options instead */
attribute_deprecated
int pre_me;
#endif
/**
* motion estimation prepass comparison function
* - encoding: Set by user.
* - decoding: unused
*/
int me_pre_cmp;
/**
* ME prepass diamond size & shape
* - encoding: Set by user.
* - decoding: unused
*/
int pre_dia_size;
/**
* subpel ME quality
* - encoding: Set by user.
* - decoding: unused
*/
int me_subpel_quality;
#if FF_API_AFD
/**
* DTG active format information (additional aspect ratio
* information only used in DVB MPEG-2 transport streams)
* 0 if not set.
*
* - encoding: unused
* - decoding: Set by decoder.
* @deprecated Deprecated in favor of AVSideData
*/
attribute_deprecated int dtg_active_format;
#define FF_DTG_AFD_SAME 8
#define FF_DTG_AFD_4_3 9
#define FF_DTG_AFD_16_9 10
#define FF_DTG_AFD_14_9 11
#define FF_DTG_AFD_4_3_SP_14_9 13
#define FF_DTG_AFD_16_9_SP_14_9 14
#define FF_DTG_AFD_SP_4_3 15
#endif /* FF_API_AFD */
/**
* maximum motion estimation search range in subpel units
* If 0 then no limit.
*
* - encoding: Set by user.
* - decoding: unused
*/
int me_range;
#if FF_API_QUANT_BIAS
/**
* @deprecated use encoder private option instead
*/
attribute_deprecated int intra_quant_bias;
#define FF_DEFAULT_QUANT_BIAS 999999
/**
* @deprecated use encoder private option instead
*/
attribute_deprecated int inter_quant_bias;
#endif
/**
* slice flags
* - encoding: unused
* - decoding: Set by user.
*/
int slice_flags;
#define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
#define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG-2 field pics)
#define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
#if FF_API_XVMC
/**
* XVideo Motion Acceleration
* - encoding: forbidden
* - decoding: set by decoder
* @deprecated XvMC support is slated for removal.
*/
attribute_deprecated int xvmc_acceleration;
#endif /* FF_API_XVMC */
/**
* macroblock decision mode
* - encoding: Set by user.
* - decoding: unused
*/
int mb_decision;
#define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
#define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
#define FF_MB_DECISION_RD 2 ///< rate distortion
/**
* custom intra quantization matrix
* - encoding: Set by user, can be NULL.
* - decoding: Set by libavcodec.
*/
uint16_t *intra_matrix;
/**
* custom inter quantization matrix
* - encoding: Set by user, can be NULL.
* - decoding: Set by libavcodec.
*/
uint16_t *inter_matrix;
#if FF_API_PRIVATE_OPT
/** @deprecated use encoder private options instead */
attribute_deprecated
int scenechange_threshold;
/** @deprecated use encoder private options instead */
attribute_deprecated
int noise_reduction;
#endif
#if FF_API_MPV_OPT
/**
* @deprecated this field is unused
*/
attribute_deprecated
int me_threshold;
/**
* @deprecated this field is unused
*/
attribute_deprecated
int mb_threshold;
#endif
/**
* precision of the intra DC coefficient - 8
* - encoding: Set by user.
* - decoding: unused
*/
int intra_dc_precision;
/**
* Number of macroblock rows at the top which are skipped.
* - encoding: unused
* - decoding: Set by user.
*/
int skip_top;
/**
* Number of macroblock rows at the bottom which are skipped.
* - encoding: unused
* - decoding: Set by user.
*/
int skip_bottom;
#if FF_API_MPV_OPT
/**
* @deprecated use encoder private options instead
*/
attribute_deprecated
float border_masking;
#endif
/**
* minimum MB Lagrange multiplier
* - encoding: Set by user.
* - decoding: unused
*/
int mb_lmin;
/**
* maximum MB Lagrange multiplier
* - encoding: Set by user.
* - decoding: unused
*/
int mb_lmax;
#if FF_API_PRIVATE_OPT
/**
* @deprecated use encoder private options instead
*/
attribute_deprecated
int me_penalty_compensation;
#endif
/**
* - encoding: Set by user.
* - decoding: unused
*/
int bidir_refine;
#if FF_API_PRIVATE_OPT
/** @deprecated use encoder private options instead */
attribute_deprecated
int brd_scale;
#endif
/**
* minimum GOP size
* - encoding: Set by user.
* - decoding: unused
*/
int keyint_min;
/**
* number of reference frames
* - encoding: Set by user.
* - decoding: Set by lavc.
*/
int refs;
#if FF_API_PRIVATE_OPT
/** @deprecated use encoder private options instead */
attribute_deprecated
int chromaoffset;
#endif
#if FF_API_UNUSED_MEMBERS
/**
* Multiplied by qscale for each frame and added to scene_change_score.
* - encoding: Set by user.
* - decoding: unused
*/
attribute_deprecated int scenechange_factor;
#endif
/**
* Note: Value depends upon the compare function used for fullpel ME.
* - encoding: Set by user.
* - decoding: unused
*/
int mv0_threshold;
#if FF_API_PRIVATE_OPT
/** @deprecated use encoder private options instead */
attribute_deprecated
int b_sensitivity;
#endif
/**
* Chromaticity coordinates of the source primaries.
* - encoding: Set by user
* - decoding: Set by libavcodec
*/
enum AVColorPrimaries color_primaries;
/**
* Color Transfer Characteristic.
* - encoding: Set by user
* - decoding: Set by libavcodec
*/
enum AVColorTransferCharacteristic color_trc;
/**
* YUV colorspace type.
* - encoding: Set by user
* - decoding: Set by libavcodec
*/
enum AVColorSpace colorspace;
/**
* MPEG vs JPEG YUV range.
* - encoding: Set by user
* - decoding: Set by libavcodec
*/
enum AVColorRange color_range;
/**
* This defines the location of chroma samples.
* - encoding: Set by user
* - decoding: Set by libavcodec
*/
enum AVChromaLocation chroma_sample_location;
/**
* Number of slices.
* Indicates number of picture subdivisions. Used for parallelized
* decoding.
* - encoding: Set by user
* - decoding: unused
*/
int slices;
/** Field order
* - encoding: set by libavcodec
* - decoding: Set by libavcodec
*/
enum AVFieldOrder field_order;
/* audio only */
int sample_rate; ///< samples per second
int channels; ///< number of audio channels
/**
* audio sample format
* - encoding: Set by user.
* - decoding: Set by libavcodec.
*/
enum AVSampleFormat sample_fmt; ///< sample format
/* The following data should not be initialized. */
/**
* Number of samples per channel in an audio frame.
*
* - encoding: set by libavcodec in avcodec_open2(). Each submitted frame
* except the last must contain exactly frame_size samples per channel.
* May be 0 when the codec has AV_CODEC_CAP_VARIABLE_FRAME_SIZE set, then the
* frame size is not restricted.
* - decoding: may be set by some decoders to indicate constant frame size
*/
int frame_size;
/**
* Frame counter, set by libavcodec.
*
* - decoding: total number of frames returned from the decoder so far.
* - encoding: total number of frames passed to the encoder so far.
*
* @note the counter is not incremented if encoding/decoding resulted in
* an error.
*/
int frame_number;
/**
* number of bytes per packet if constant and known or 0
* Used by some WAV based audio codecs.
*/
int block_align;
/**
* Audio cutoff bandwidth (0 means "automatic")
* - encoding: Set by user.
* - decoding: unused
*/
int cutoff;
/**
* Audio channel layout.
* - encoding: set by user.
* - decoding: set by libavcodec.
*/
uint64_t channel_layout;
/**
* Request decoder to use this channel layout if it can (0 for default)
* - encoding: unused
* - decoding: Set by user.
*/
uint64_t request_channel_layout;
/**
* Type of service that the audio stream conveys.
* - encoding: Set by user.
* - decoding: Set by libavcodec.
*/
enum AVAudioServiceType audio_service_type;
/**
* Used to request a sample format from the decoder.
* - encoding: unused.
* - decoding: Set by user.
*/
enum AVSampleFormat request_sample_fmt;
/**
* This callback is called at the beginning of each frame to get data
* buffer(s) for it. There may be one contiguous buffer for all the data or
* there may be a buffer per each data plane or anything in between. What
* this means is, you may set however many entries in buf[] you feel necessary.
* Each buffer must be reference-counted using the AVBuffer API (see description
* of buf[] below).
*
* The following fields will be set in the frame before this callback is
* called:
* - format
* - width, height (video only)
* - sample_rate, channel_layout, nb_samples (audio only)
* Their values may differ from the corresponding values in
* AVCodecContext. This callback must use the frame values, not the codec
* context values, to calculate the required buffer size.
*
* This callback must fill the following fields in the frame:
* - data[]
* - linesize[]
* - extended_data:
* * if the data is planar audio with more than 8 channels, then this
* callback must allocate and fill extended_data to contain all pointers
* to all data planes. data[] must hold as many pointers as it can.
* extended_data must be allocated with av_malloc() and will be freed in
* av_frame_unref().
* * otherwise extended_data must point to data
* - buf[] must contain one or more pointers to AVBufferRef structures. Each of
* the frame's data and extended_data pointers must be contained in these. That
* is, one AVBufferRef for each allocated chunk of memory, not necessarily one
* AVBufferRef per data[] entry. See: av_buffer_create(), av_buffer_alloc(),
* and av_buffer_ref().
* - extended_buf and nb_extended_buf must be allocated with av_malloc() by
* this callback and filled with the extra buffers if there are more
* buffers than buf[] can hold. extended_buf will be freed in
* av_frame_unref().
*
* If AV_CODEC_CAP_DR1 is not set then get_buffer2() must call
* avcodec_default_get_buffer2() instead of providing buffers allocated by
* some other means.
*
* Each data plane must be aligned to the maximum required by the target
* CPU.
*
* @see avcodec_default_get_buffer2()
*
* Video:
*
* If AV_GET_BUFFER_FLAG_REF is set in flags then the frame may be reused
* (read and/or written to if it is writable) later by libavcodec.
*
* avcodec_align_dimensions2() should be used to find the required width and
* height, as they normally need to be rounded up to the next multiple of 16.
*
* If frame multithreading is used and thread_safe_callbacks is set,
* this callback may be called from a different thread, but not from more
* than one at once. Does not need to be reentrant.
*
* @see avcodec_align_dimensions2()
*
* Audio:
*
* Decoders request a buffer of a particular size by setting
* AVFrame.nb_samples prior to calling get_buffer2(). The decoder may,
* however, utilize only part of the buffer by setting AVFrame.nb_samples
* to a smaller value in the output frame.
*
* As a convenience, av_samples_get_buffer_size() and
* av_samples_fill_arrays() in libavutil may be used by custom get_buffer2()
* functions to find the required data size and to fill data pointers and
* linesize. In AVFrame.linesize, only linesize[0] may be set for audio
* since all planes must be the same size.
*
* @see av_samples_get_buffer_size(), av_samples_fill_arrays()
*
* - encoding: unused
* - decoding: Set by libavcodec, user can override.
*/
int (*get_buffer2)(struct AVCodecContext *s, AVFrame *frame, int flags);
/**
* If non-zero, the decoded audio and video frames returned from
* avcodec_decode_video2() and avcodec_decode_audio4() are reference-counted
* and are valid indefinitely. The caller must free them with
* av_frame_unref() when they are not needed anymore.
* Otherwise, the decoded frames must not be freed by the caller and are
* only valid until the next decode call.
*
* This is always automatically enabled if avcodec_receive_frame() is used.
*
* - encoding: unused
* - decoding: set by the caller before avcodec_open2().
*/
int refcounted_frames;
/* - encoding parameters */
float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
/**
* minimum quantizer
* - encoding: Set by user.
* - decoding: unused
*/
int qmin;
/**
* maximum quantizer
* - encoding: Set by user.
* - decoding: unused
*/
int qmax;
/**
* maximum quantizer difference between frames
* - encoding: Set by user.
* - decoding: unused
*/
int max_qdiff;
#if FF_API_MPV_OPT
/**
* @deprecated use encoder private options instead
*/
attribute_deprecated
float rc_qsquish;
attribute_deprecated
float rc_qmod_amp;
attribute_deprecated
int rc_qmod_freq;
#endif
/**
* decoder bitstream buffer size
* - encoding: Set by user.
* - decoding: unused
*/
int rc_buffer_size;
/**
* ratecontrol override, see RcOverride
* - encoding: Allocated/set/freed by user.
* - decoding: unused
*/
int rc_override_count;
RcOverride *rc_override;
#if FF_API_MPV_OPT
/**
* @deprecated use encoder private options instead
*/
attribute_deprecated
const char *rc_eq;
#endif
/**
* maximum bitrate
* - encoding: Set by user.
* - decoding: unused
*/
int rc_max_rate;
/**
* minimum bitrate
* - encoding: Set by user.
* - decoding: unused
*/
int rc_min_rate;
#if FF_API_MPV_OPT
/**
* @deprecated use encoder private options instead
*/
attribute_deprecated
float rc_buffer_aggressivity;
attribute_deprecated
float rc_initial_cplx;
#endif
/**
* Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
* - encoding: Set by user.
* - decoding: unused.
*/
float rc_max_available_vbv_use;
/**
* Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
* - encoding: Set by user.
* - decoding: unused.
*/
float rc_min_vbv_overflow_use;
/**
* Number of bits which should be loaded into the rc buffer before decoding starts.
* - encoding: Set by user.
* - decoding: unused
*/
int rc_initial_buffer_occupancy;
#if FF_API_CODER_TYPE
#define FF_CODER_TYPE_VLC 0
#define FF_CODER_TYPE_AC 1
#define FF_CODER_TYPE_RAW 2
#define FF_CODER_TYPE_RLE 3
#if FF_API_UNUSED_MEMBERS
#define FF_CODER_TYPE_DEFLATE 4
#endif /* FF_API_UNUSED_MEMBERS */
/**
* @deprecated use encoder private options instead
*/
attribute_deprecated
int coder_type;
#endif /* FF_API_CODER_TYPE */
#if FF_API_PRIVATE_OPT
/** @deprecated use encoder private options instead */
attribute_deprecated
int context_model;
#endif
#if FF_API_MPV_OPT
/**
* @deprecated use encoder private options instead
*/
attribute_deprecated
int lmin;
/**
* @deprecated use encoder private options instead
*/
attribute_deprecated
int lmax;
#endif
#if FF_API_PRIVATE_OPT
/** @deprecated use encoder private options instead */
attribute_deprecated
int frame_skip_threshold;
/** @deprecated use encoder private options instead */
attribute_deprecated
int frame_skip_factor;
/** @deprecated use encoder private options instead */
attribute_deprecated
int frame_skip_exp;
/** @deprecated use encoder private options instead */
attribute_deprecated
int frame_skip_cmp;
#endif /* FF_API_PRIVATE_OPT */
/**
* trellis RD quantization
* - encoding: Set by user.
* - decoding: unused
*/
int trellis;
#if FF_API_PRIVATE_OPT
/** @deprecated use encoder private options instead */
attribute_deprecated
int min_prediction_order;
/** @deprecated use encoder private options instead */
attribute_deprecated
int max_prediction_order;
/** @deprecated use encoder private options instead */
attribute_deprecated
int64_t timecode_frame_start;
#endif
#if FF_API_RTP_CALLBACK
/**
* @deprecated unused
*/
/* The RTP callback: This function is called */
/* every time the encoder has a packet to send. */
/* It depends on the encoder if the data starts */
/* with a Start Code (it should). H.263 does. */
/* mb_nb contains the number of macroblocks */
/* encoded in the RTP payload. */
attribute_deprecated
void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
#endif
#if FF_API_PRIVATE_OPT
/** @deprecated use encoder private options instead */
attribute_deprecated
int rtp_payload_size; /* The size of the RTP payload: the coder will */
/* do its best to deliver a chunk with size */
/* below rtp_payload_size, the chunk will start */
/* with a start code on some codecs like H.263. */
/* This doesn't take account of any particular */
/* headers inside the transmitted RTP payload. */
#endif
#if FF_API_STAT_BITS
/* statistics, used for 2-pass encoding */
attribute_deprecated
int mv_bits;
attribute_deprecated
int header_bits;
attribute_deprecated
int i_tex_bits;
attribute_deprecated
int p_tex_bits;
attribute_deprecated
int i_count;
attribute_deprecated
int p_count;
attribute_deprecated
int skip_count;
attribute_deprecated
int misc_bits;
/** @deprecated this field is unused */
attribute_deprecated
int frame_bits;
#endif
/**
* pass1 encoding statistics output buffer
* - encoding: Set by libavcodec.
* - decoding: unused
*/
char *stats_out;
/**
* pass2 encoding statistics input buffer
* Concatenated stuff from stats_out of pass1 should be placed here.
* - encoding: Allocated/set/freed by user.
* - decoding: unused
*/
char *stats_in;
/**
* Work around bugs in encoders which sometimes cannot be detected automatically.
* - encoding: Set by user
* - decoding: Set by user
*/
int workaround_bugs;
#define FF_BUG_AUTODETECT 1 ///< autodetection
#if FF_API_OLD_MSMPEG4
#define FF_BUG_OLD_MSMPEG4 2
#endif
#define FF_BUG_XVID_ILACE 4
#define FF_BUG_UMP4 8
#define FF_BUG_NO_PADDING 16
#define FF_BUG_AMV 32
#if FF_API_AC_VLC
#define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
#endif
#define FF_BUG_QPEL_CHROMA 64
#define FF_BUG_STD_QPEL 128
#define FF_BUG_QPEL_CHROMA2 256
#define FF_BUG_DIRECT_BLOCKSIZE 512
#define FF_BUG_EDGE 1024
#define FF_BUG_HPEL_CHROMA 2048
#define FF_BUG_DC_CLIP 4096
#define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
#define FF_BUG_TRUNCATED 16384
/**
* strictly follow the standard (MPEG-4, ...).
* - encoding: Set by user.
* - decoding: Set by user.
* Setting this to STRICT or higher means the encoder and decoder will
* generally do stupid things, whereas setting it to unofficial or lower
* will mean the encoder might produce output that is not supported by all
* spec-compliant decoders. Decoders don't differentiate between normal,
* unofficial and experimental (that is, they always try to decode things
* when they can) unless they are explicitly asked to behave stupidly
* (=strictly conform to the specs)
*/
int strict_std_compliance;
#define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
#define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
#define FF_COMPLIANCE_NORMAL 0
#define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
#define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
/**
* error concealment flags
* - encoding: unused
* - decoding: Set by user.
*/
int error_concealment;
#define FF_EC_GUESS_MVS 1
#define FF_EC_DEBLOCK 2
/**
* debug
* - encoding: Set by user.
* - decoding: Set by user.
*/
int debug;
#define FF_DEBUG_PICT_INFO 1
#define FF_DEBUG_RC 2
#define FF_DEBUG_BITSTREAM 4
#define FF_DEBUG_MB_TYPE 8
#define FF_DEBUG_QP 16
#if FF_API_DEBUG_MV
/**
* @deprecated this option does nothing
*/
#define FF_DEBUG_MV 32
#endif
#define FF_DEBUG_DCT_COEFF 0x00000040
#define FF_DEBUG_SKIP 0x00000080
#define FF_DEBUG_STARTCODE 0x00000100
#if FF_API_UNUSED_MEMBERS
#define FF_DEBUG_PTS 0x00000200
#endif /* FF_API_UNUSED_MEMBERS */
#define FF_DEBUG_ER 0x00000400
#define FF_DEBUG_MMCO 0x00000800
#define FF_DEBUG_BUGS 0x00001000
#if FF_API_DEBUG_MV
#define FF_DEBUG_VIS_QP 0x00002000
#define FF_DEBUG_VIS_MB_TYPE 0x00004000
#endif
#define FF_DEBUG_BUFFERS 0x00008000
#define FF_DEBUG_THREADS 0x00010000
#if FF_API_DEBUG_MV
/**
* @deprecated this option does not have any effect
*/
attribute_deprecated
int debug_mv;
#define FF_DEBUG_VIS_MV_P_FOR 0x00000001 // visualize forward predicted MVs of P-frames
#define FF_DEBUG_VIS_MV_B_FOR 0x00000002 // visualize forward predicted MVs of B-frames
#define FF_DEBUG_VIS_MV_B_BACK 0x00000004 // visualize backward predicted MVs of B-frames
#endif
/**
* Error recognition; may misdetect some more or less valid parts as errors.
* - encoding: unused
* - decoding: Set by user.
*/
int err_recognition;
/**
* Verify checksums embedded in the bitstream (could be of either encoded or
* decoded data, depending on the codec) and print an error message on mismatch.
* If AV_EF_EXPLODE is also set, a mismatching checksum will result in the
* decoder returning an error.
*/
#define AV_EF_CRCCHECK (1<<0)
#define AV_EF_BITSTREAM (1<<1)
#define AV_EF_BUFFER (1<<2)
#define AV_EF_EXPLODE (1<<3)
/**
* opaque 64-bit number (generally a PTS) that will be reordered and
* output in AVFrame.reordered_opaque
* - encoding: unused
* - decoding: Set by user.
*/
int64_t reordered_opaque;
/**
* Hardware accelerator in use
* - encoding: unused.
* - decoding: Set by libavcodec
*/
struct AVHWAccel *hwaccel;
/**
* Hardware accelerator context.
* For some hardware accelerators, a global context needs to be
* provided by the user. In that case, this holds display-dependent
* data Libav cannot instantiate itself. Please refer to the
* Libav HW accelerator documentation to know how to fill this
* is. e.g. for VA API, this is a struct vaapi_context.
* - encoding: unused
* - decoding: Set by user
*/
void *hwaccel_context;
/**
* error
* - encoding: Set by libavcodec if flags & AV_CODEC_FLAG_PSNR.
* - decoding: unused
*/
uint64_t error[AV_NUM_DATA_POINTERS];
/**
* DCT algorithm, see FF_DCT_* below
* - encoding: Set by user.
* - decoding: unused
*/
int dct_algo;
#define FF_DCT_AUTO 0
#define FF_DCT_FASTINT 1
#define FF_DCT_INT 2
#define FF_DCT_MMX 3
#define FF_DCT_ALTIVEC 5
#define FF_DCT_FAAN 6
/**
* IDCT algorithm, see FF_IDCT_* below.
* - encoding: Set by user.
* - decoding: Set by user.
*/
int idct_algo;
#define FF_IDCT_AUTO 0
#define FF_IDCT_INT 1
#define FF_IDCT_SIMPLE 2
#define FF_IDCT_SIMPLEMMX 3
#define FF_IDCT_ARM 7
#define FF_IDCT_ALTIVEC 8
#if FF_API_ARCH_SH4
#define FF_IDCT_SH4 9
#endif
#define FF_IDCT_SIMPLEARM 10
#if FF_API_UNUSED_MEMBERS
#define FF_IDCT_IPP 13
#endif /* FF_API_UNUSED_MEMBERS */
#define FF_IDCT_XVID 14
#if FF_API_IDCT_XVIDMMX
#define FF_IDCT_XVIDMMX 14
#endif /* FF_API_IDCT_XVIDMMX */
#define FF_IDCT_SIMPLEARMV5TE 16
#define FF_IDCT_SIMPLEARMV6 17
#if FF_API_ARCH_SPARC
#define FF_IDCT_SIMPLEVIS 18
#endif
#define FF_IDCT_FAAN 20
#define FF_IDCT_SIMPLENEON 22
#if FF_API_ARCH_ALPHA
#define FF_IDCT_SIMPLEALPHA 23
#endif
/**
* bits per sample/pixel from the demuxer (needed for huffyuv).
* - encoding: Set by libavcodec.
* - decoding: Set by user.
*/
int bits_per_coded_sample;
/**
* Bits per sample/pixel of internal libavcodec pixel/sample format.
* - encoding: set by user.
* - decoding: set by libavcodec.
*/
int bits_per_raw_sample;
#if FF_API_LOWRES
/**
* low resolution decoding, 1-> 1/2 size, 2->1/4 size
* - encoding: unused
* - decoding: Set by user.
*
* @deprecated use decoder private options instead
*/
attribute_deprecated int lowres;
#endif
#if FF_API_CODED_FRAME
/**
* the picture in the bitstream
* - encoding: Set by libavcodec.
* - decoding: unused
*
* @deprecated use the quality factor packet side data instead
*/
attribute_deprecated AVFrame *coded_frame;
#endif
/**
* thread count
* is used to decide how many independent tasks should be passed to execute()
* - encoding: Set by user.
* - decoding: Set by user.
*/
int thread_count;
/**
* Which multithreading methods to use.
* Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
* so clients which cannot provide future frames should not use it.
*
* - encoding: Set by user, otherwise the default is used.
* - decoding: Set by user, otherwise the default is used.
*/
int thread_type;
#define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
#define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
/**
* Which multithreading methods are in use by the codec.
* - encoding: Set by libavcodec.
* - decoding: Set by libavcodec.
*/
int active_thread_type;
/**
* Set by the client if its custom get_buffer() callback can be called
* synchronously from another thread, which allows faster multithreaded decoding.
* draw_horiz_band() will be called from other threads regardless of this setting.
* Ignored if the default get_buffer() is used.
* - encoding: Set by user.
* - decoding: Set by user.
*/
int thread_safe_callbacks;
/**
* The codec may call this to execute several independent things.
* It will return only after finishing all tasks.
* The user may replace this with some multithreaded implementation,
* the default implementation will execute the parts serially.
* @param count the number of things to execute
* - encoding: Set by libavcodec, user can override.
* - decoding: Set by libavcodec, user can override.
*/
int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
/**
* The codec may call this to execute several independent things.
* It will return only after finishing all tasks.
* The user may replace this with some multithreaded implementation,
* the default implementation will execute the parts serially.
* Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
* @param c context passed also to func
* @param count the number of things to execute
* @param arg2 argument passed unchanged to func
* @param ret return values of executed functions, must have space for "count" values. May be NULL.
* @param func function that will be called count times, with jobnr from 0 to count-1.
* threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
* two instances of func executing at the same time will have the same threadnr.
* @return always 0 currently, but code should handle a future improvement where when any call to func
* returns < 0 no further calls to func may be done and < 0 is returned.
* - encoding: Set by libavcodec, user can override.
* - decoding: Set by libavcodec, user can override.
*/
int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
/**
* noise vs. sse weight for the nsse comparison function
* - encoding: Set by user.
* - decoding: unused
*/
int nsse_weight;
/**
* profile
* - encoding: Set by user.
* - decoding: Set by libavcodec.
*/
int profile;
#define FF_PROFILE_UNKNOWN -99
#define FF_PROFILE_RESERVED -100
#define FF_PROFILE_AAC_MAIN 0
#define FF_PROFILE_AAC_LOW 1
#define FF_PROFILE_AAC_SSR 2
#define FF_PROFILE_AAC_LTP 3
#define FF_PROFILE_AAC_HE 4
#define FF_PROFILE_AAC_HE_V2 28
#define FF_PROFILE_AAC_LD 22
#define FF_PROFILE_AAC_ELD 38
#define FF_PROFILE_MPEG2_AAC_LOW 128
#define FF_PROFILE_MPEG2_AAC_HE 131
#define FF_PROFILE_DTS 20
#define FF_PROFILE_DTS_ES 30
#define FF_PROFILE_DTS_96_24 40
#define FF_PROFILE_DTS_HD_HRA 50
#define FF_PROFILE_DTS_HD_MA 60
#define FF_PROFILE_DTS_EXPRESS 70
#define FF_PROFILE_MPEG2_422 0
#define FF_PROFILE_MPEG2_HIGH 1
#define FF_PROFILE_MPEG2_SS 2
#define FF_PROFILE_MPEG2_SNR_SCALABLE 3
#define FF_PROFILE_MPEG2_MAIN 4
#define FF_PROFILE_MPEG2_SIMPLE 5
#define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
#define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
#define FF_PROFILE_H264_BASELINE 66
#define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
#define FF_PROFILE_H264_MAIN 77
#define FF_PROFILE_H264_EXTENDED 88
#define FF_PROFILE_H264_HIGH 100
#define FF_PROFILE_H264_HIGH_10 110
#define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
#define FF_PROFILE_H264_MULTIVIEW_HIGH 118
#define FF_PROFILE_H264_HIGH_422 122
#define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
#define FF_PROFILE_H264_STEREO_HIGH 128
#define FF_PROFILE_H264_HIGH_444 144
#define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
#define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
#define FF_PROFILE_H264_CAVLC_444 44
#define FF_PROFILE_VC1_SIMPLE 0
#define FF_PROFILE_VC1_MAIN 1
#define FF_PROFILE_VC1_COMPLEX 2
#define FF_PROFILE_VC1_ADVANCED 3
#define FF_PROFILE_MPEG4_SIMPLE 0
#define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
#define FF_PROFILE_MPEG4_CORE 2
#define FF_PROFILE_MPEG4_MAIN 3
#define FF_PROFILE_MPEG4_N_BIT 4
#define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
#define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
#define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
#define FF_PROFILE_MPEG4_HYBRID 8
#define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
#define FF_PROFILE_MPEG4_CORE_SCALABLE 10
#define FF_PROFILE_MPEG4_ADVANCED_CODING 11
#define FF_PROFILE_MPEG4_ADVANCED_CORE 12
#define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
#define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
#define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
#define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_0 1
#define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_1 2
#define FF_PROFILE_JPEG2000_CSTREAM_NO_RESTRICTION 32768
#define FF_PROFILE_JPEG2000_DCINEMA_2K 3
#define FF_PROFILE_JPEG2000_DCINEMA_4K 4
#define FF_PROFILE_VP9_0 0
#define FF_PROFILE_VP9_1 1
#define FF_PROFILE_VP9_2 2
#define FF_PROFILE_VP9_3 3
#define FF_PROFILE_HEVC_MAIN 1
#define FF_PROFILE_HEVC_MAIN_10 2
#define FF_PROFILE_HEVC_MAIN_STILL_PICTURE 3
#define FF_PROFILE_HEVC_REXT 4
/**
* level
* - encoding: Set by user.
* - decoding: Set by libavcodec.
*/
int level;
#define FF_LEVEL_UNKNOWN -99
/**
* - encoding: unused
* - decoding: Set by user.
*/
enum AVDiscard skip_loop_filter;
/**
* - encoding: unused
* - decoding: Set by user.
*/
enum AVDiscard skip_idct;
/**
* - encoding: unused
* - decoding: Set by user.
*/
enum AVDiscard skip_frame;
/**
* Header containing style information for text subtitles.
* For SUBTITLE_ASS subtitle type, it should contain the whole ASS
* [Script Info] and [V4+ Styles] section, plus the [Events] line and
* the Format line following. It shouldn't include any Dialogue line.
* - encoding: Set/allocated/freed by user (before avcodec_open2())
* - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
*/
uint8_t *subtitle_header;
int subtitle_header_size;
#if FF_API_ERROR_RATE
/**
* @deprecated use the 'error_rate' private AVOption of the mpegvideo
* encoders
*/
attribute_deprecated
int error_rate;
#endif
#if FF_API_VBV_DELAY
/**
* VBV delay coded in the last frame (in periods of a 27 MHz clock).
* Used for compliant TS muxing.
* - encoding: Set by libavcodec.
* - decoding: unused.
* @deprecated this value is now exported as a part of
* AV_PKT_DATA_CPB_PROPERTIES packet side data
*/
attribute_deprecated
uint64_t vbv_delay;
#endif
#if FF_API_SIDEDATA_ONLY_PKT
/**
* Encoding only and set by default. Allow encoders to output packets
* that do not contain any encoded data, only side data.
*
* Some encoders need to output such packets, e.g. to update some stream
* parameters at the end of encoding.
*
* @deprecated this field disables the default behaviour and
* it is kept only for compatibility.
*/
attribute_deprecated
int side_data_only_packets;
#endif
/**
* Audio only. The number of "priming" samples (padding) inserted by the
* encoder at the beginning of the audio. I.e. this number of leading
* decoded samples must be discarded by the caller to get the original audio
* without leading padding.
*
* - decoding: unused
* - encoding: Set by libavcodec. The timestamps on the output packets are
* adjusted by the encoder so that they always refer to the
* first sample of the data actually contained in the packet,
* including any added padding. E.g. if the timebase is
* 1/samplerate and the timestamp of the first input sample is
* 0, the timestamp of the first output packet will be
* -initial_padding.
*/
int initial_padding;
/*
* - decoding: For codecs that store a framerate value in the compressed
* bitstream, the decoder may export it here. { 0, 1} when
* unknown.
* - encoding: May be used to signal the framerate of CFR content to an
* encoder.
*/
AVRational framerate;
/**
* Nominal unaccelerated pixel format, see AV_PIX_FMT_xxx.
* - encoding: unused.
* - decoding: Set by libavcodec before calling get_format()
*/
enum AVPixelFormat sw_pix_fmt;
/**
* Additional data associated with the entire coded stream.
*
* - decoding: unused
* - encoding: may be set by libavcodec after avcodec_open2().
*/
AVPacketSideData *coded_side_data;
int nb_coded_side_data;
/**
* A reference to the AVHWFramesContext describing the input (for encoding)
* or output (decoding) frames. The reference is set by the caller and
* afterwards owned (and freed) by libavcodec.
*
* - decoding: This field should be set by the caller from the get_format()
* callback. The previous reference (if any) will always be
* unreffed by libavcodec before the get_format() call.
*
* If the default get_buffer2() is used with a hwaccel pixel
* format, then this AVHWFramesContext will be used for
* allocating the frame buffers.
*
* - encoding: For hardware encoders configured to use a hwaccel pixel
* format, this field should be set by the caller to a reference
* to the AVHWFramesContext describing input frames.
* AVHWFramesContext.format must be equal to
* AVCodecContext.pix_fmt.
*
* This field should be set before avcodec_open2() is called.
*/
AVBufferRef *hw_frames_ctx;
/**
* Video decoding only. Certain video codecs support cropping, meaning that
* only a sub-rectangle of the decoded frame is intended for display. This
* option controls how cropping is handled by libavcodec.
*
* When set to 1 (the default), libavcodec will apply cropping internally.
* I.e. it will modify the output frame width/height fields and offset the
* data pointers (only by as much as possible while preserving alignment, or
* by the full amount if the AV_CODEC_FLAG_UNALIGNED flag is set) so that
* the frames output by the decoder refer only to the cropped area. The
* crop_* fields of the output frames will be zero.
*
* When set to 0, the width/height fields of the output frames will be set
* to the coded dimensions and the crop_* fields will describe the cropping
* rectangle. Applying the cropping is left to the caller.
*
* @warning When hardware acceleration with opaque output frames is used,
* libavcodec is unable to apply cropping from the top/left border.
*
* @note when this option is set to zero, the width/height fields of the
* AVCodecContext and output AVFrames have different meanings. The codec
* context fields store display dimensions (with the coded dimensions in
* coded_width/height), while the frame fields store the coded dimensions
* (with the display dimensions being determined by the crop_* fields).
*/
int apply_cropping;
} AVCodecContext;
/**
* AVProfile.
*/
typedef struct AVProfile {
int profile;
const char *name; ///< short name for the profile
} AVProfile;
typedef struct AVCodecDefault AVCodecDefault;
struct AVSubtitle;
/**
* AVCodec.
*/
typedef struct AVCodec {
/**
* Name of the codec implementation.
* The name is globally unique among encoders and among decoders (but an
* encoder and a decoder can share the same name).
* This is the primary way to find a codec from the user perspective.
*/
const char *name;
/**
* Descriptive name for the codec, meant to be more human readable than name.
* You should use the NULL_IF_CONFIG_SMALL() macro to define it.
*/
const char *long_name;
enum AVMediaType type;
enum AVCodecID id;
/**
* Codec capabilities.
* see AV_CODEC_CAP_*
*/
int capabilities;
const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
const enum AVPixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
#if FF_API_LOWRES
attribute_deprecated uint8_t max_lowres; ///< maximum value for lowres supported by the decoder
#endif
const AVClass *priv_class; ///< AVClass for the private context
const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
/*****************************************************************
* No fields below this line are part of the public API. They
* may not be used outside of libavcodec and can be changed and
* removed at will.
* New public fields should be added right above.
*****************************************************************
*/
int priv_data_size;
struct AVCodec *next;
/**
* @name Frame-level threading support functions
* @{
*/
/**
* If defined, called on thread contexts when they are created.
* If the codec allocates writable tables in init(), re-allocate them here.
* priv_data will be set to a copy of the original.
*/
int (*init_thread_copy)(AVCodecContext *);
/**
* Copy necessary context variables from a previous thread context to the current one.
* If not defined, the next thread will start automatically; otherwise, the codec
* must call ff_thread_finish_setup().
*
* dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
*/
int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
/** @} */
/**
* Private codec-specific defaults.
*/
const AVCodecDefault *defaults;
/**
* Initialize codec static data, called from avcodec_register().
*/
void (*init_static_data)(struct AVCodec *codec);
int (*init)(AVCodecContext *);
int (*encode_sub)(AVCodecContext *, uint8_t *buf, int buf_size,
const struct AVSubtitle *sub);
/**
* Encode data to an AVPacket.
*
* @param avctx codec context
* @param avpkt output AVPacket (may contain a user-provided buffer)
* @param[in] frame AVFrame containing the raw data to be encoded
* @param[out] got_packet_ptr encoder sets to 0 or 1 to indicate that a
* non-empty packet was returned in avpkt.
* @return 0 on success, negative error code on failure
*/
int (*encode2)(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame,
int *got_packet_ptr);
int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
int (*close)(AVCodecContext *);
/**
* Encode API with decoupled packet/frame dataflow. The API is the
* same as the avcodec_ prefixed APIs (avcodec_send_frame() etc.), except
* that:
* - never called if the codec is closed or the wrong type,
* - if AV_CODEC_CAP_DELAY is not set, drain frames are never sent,
* - only one drain frame is ever passed down,
*/
int (*send_frame)(AVCodecContext *avctx, const AVFrame *frame);
int (*receive_packet)(AVCodecContext *avctx, AVPacket *avpkt);
/**
* Decode API with decoupled packet/frame dataflow. This function is called
* to get one output frame. It should call ff_decode_get_packet() to obtain
* input data.
*/
int (*receive_frame)(AVCodecContext *avctx, AVFrame *frame);
/**
* Flush buffers.
* Will be called when seeking
*/
void (*flush)(AVCodecContext *);
/**
* Internal codec capabilities.
* See FF_CODEC_CAP_* in internal.h
*/
int caps_internal;
/**
* Decoding only, a comma-separated list of bitstream filters to apply to
* packets before decoding.
*/
const char *bsfs;
} AVCodec;
/**
* @defgroup lavc_hwaccel AVHWAccel
* @{
*/
typedef struct AVHWAccel {
/**
* Name of the hardware accelerated codec.
* The name is globally unique among encoders and among decoders (but an
* encoder and a decoder can share the same name).
*/
const char *name;
/**
* Type of codec implemented by the hardware accelerator.
*
* See AVMEDIA_TYPE_xxx
*/
enum AVMediaType type;
/**
* Codec implemented by the hardware accelerator.
*
* See AV_CODEC_ID_xxx
*/
enum AVCodecID id;
/**
* Supported pixel format.
*
* Only hardware accelerated formats are supported here.
*/
enum AVPixelFormat pix_fmt;
/**
* Hardware accelerated codec capabilities.
* see FF_HWACCEL_CODEC_CAP_*
*/
int capabilities;
/*****************************************************************
* No fields below this line are part of the public API. They
* may not be used outside of libavcodec and can be changed and
* removed at will.
* New public fields should be added right above.
*****************************************************************
*/
struct AVHWAccel *next;
/**
* Allocate a custom buffer
*/
int (*alloc_frame)(AVCodecContext *avctx, AVFrame *frame);
/**
* Called at the beginning of each frame or field picture.
*
* Meaningful frame information (codec specific) is guaranteed to
* be parsed at this point. This function is mandatory.
*
* Note that buf can be NULL along with buf_size set to 0.
* Otherwise, this means the whole frame is available at this point.
*
* @param avctx the codec context
* @param buf the frame data buffer base
* @param buf_size the size of the frame in bytes
* @return zero if successful, a negative value otherwise
*/
int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
/**
* Callback for each slice.
*
* Meaningful slice information (codec specific) is guaranteed to
* be parsed at this point. This function is mandatory.
*
* @param avctx the codec context
* @param buf the slice data buffer base
* @param buf_size the size of the slice in bytes
* @return zero if successful, a negative value otherwise
*/
int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
/**
* Called at the end of each frame or field picture.
*
* The whole picture is parsed at this point and can now be sent
* to the hardware accelerator. This function is mandatory.
*
* @param avctx the codec context
* @return zero if successful, a negative value otherwise
*/
int (*end_frame)(AVCodecContext *avctx);
/**
* Size of per-frame hardware accelerator private data.
*
* Private data is allocated with av_mallocz() before
* AVCodecContext.get_buffer() and deallocated after
* AVCodecContext.release_buffer().
*/
int frame_priv_data_size;
/**
* Initialize the hwaccel private data.
*
* This will be called from ff_get_format(), after hwaccel and
* hwaccel_context are set and the hwaccel private data in AVCodecInternal
* is allocated.
*/
int (*init)(AVCodecContext *avctx);
/**
* Uninitialize the hwaccel private data.
*
* This will be called from get_format() or avcodec_close(), after hwaccel
* and hwaccel_context are already uninitialized.
*/
int (*uninit)(AVCodecContext *avctx);
/**
* Size of the private data to allocate in
* AVCodecInternal.hwaccel_priv_data.
*/
int priv_data_size;
/**
* Internal hwaccel capabilities.
*/
int caps_internal;
} AVHWAccel;
/**
* Hardware acceleration should be used for decoding even if the codec level
* used is unknown or higher than the maximum supported level reported by the
* hardware driver.
*/
#define AV_HWACCEL_FLAG_IGNORE_LEVEL (1 << 0)
/**
* Hardware acceleration can output YUV pixel formats with a different chroma
* sampling than 4:2:0 and/or other than 8 bits per component.
*/
#define AV_HWACCEL_FLAG_ALLOW_HIGH_DEPTH (1 << 1)
/**
* @}
*/
#if FF_API_AVPICTURE
/**
* @defgroup lavc_picture AVPicture
*
* Functions for working with AVPicture
* @{
*/
/**
* four components are given, that's all.
* the last component is alpha
* @deprecated Use the imgutils functions
*/
typedef struct AVPicture {
attribute_deprecated
uint8_t *data[AV_NUM_DATA_POINTERS];
attribute_deprecated
int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line
} AVPicture;
/**
* @}
*/
#endif
#define AVPALETTE_SIZE 1024
#define AVPALETTE_COUNT 256
enum AVSubtitleType {
SUBTITLE_NONE,
SUBTITLE_BITMAP, ///< A bitmap, pict will be set
/**
* Plain text, the text field must be set by the decoder and is
* authoritative. ass and pict fields may contain approximations.
*/
SUBTITLE_TEXT,
/**
* Formatted text, the ass field must be set by the decoder and is
* authoritative. pict and text fields may contain approximations.
*/
SUBTITLE_ASS,
};
#define AV_SUBTITLE_FLAG_FORCED 0x00000001
typedef struct AVSubtitleRect {
int x; ///< top left corner of pict, undefined when pict is not set
int y; ///< top left corner of pict, undefined when pict is not set
int w; ///< width of pict, undefined when pict is not set
int h; ///< height of pict, undefined when pict is not set
int nb_colors; ///< number of colors in pict, undefined when pict is not set
#if FF_API_AVPICTURE
/**
* @deprecated unused
*/
attribute_deprecated
AVPicture pict;
#endif
/**
* data+linesize for the bitmap of this subtitle.
* Can be set for text/ass as well once they are rendered.
*/
uint8_t *data[4];
int linesize[4];
enum AVSubtitleType type;
char *text; ///< 0 terminated plain UTF-8 text
/**
* 0 terminated ASS/SSA compatible event line.
* The presentation of this is unaffected by the other values in this
* struct.
*/
char *ass;
int flags;
} AVSubtitleRect;
typedef struct AVSubtitle {
uint16_t format; /* 0 = graphics */
uint32_t start_display_time; /* relative to packet pts, in ms */
uint32_t end_display_time; /* relative to packet pts, in ms */
unsigned num_rects;
AVSubtitleRect **rects;
int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
} AVSubtitle;
/**
* This struct describes the properties of an encoded stream.
*
* sizeof(AVCodecParameters) is not a part of the public ABI, this struct must
* be allocated with avcodec_parameters_alloc() and freed with
* avcodec_parameters_free().
*/
typedef struct AVCodecParameters {
/**
* General type of the encoded data.
*/
enum AVMediaType codec_type;
/**
* Specific type of the encoded data (the codec used).
*/
enum AVCodecID codec_id;
/**
* Additional information about the codec (corresponds to the AVI FOURCC).
*/
uint32_t codec_tag;
/**
* Extra binary data needed for initializing the decoder, codec-dependent.
*
* Must be allocated with av_malloc() and will be freed by
* avcodec_parameters_free(). The allocated size of extradata must be at
* least extradata_size + AV_INPUT_BUFFER_PADDING_SIZE, with the padding
* bytes zeroed.
*/
uint8_t *extradata;
/**
* Size of the extradata content in bytes.
*/
int extradata_size;
/**
* - video: the pixel format, the value corresponds to enum AVPixelFormat.
* - audio: the sample format, the value corresponds to enum AVSampleFormat.
*/
int format;
/**
* The average bitrate of the encoded data (in bits per second).
*/
int bit_rate;
int bits_per_coded_sample;
/**
* Codec-specific bitstream restrictions that the stream conforms to.
*/
int profile;
int level;
/**
* Video only. The dimensions of the video frame in pixels.
*/
int width;
int height;
/**
* Video only. The aspect ratio (width / height) which a single pixel
* should have when displayed.
*
* When the aspect ratio is unknown / undefined, the numerator should be
* set to 0 (the denominator may have any value).
*/
AVRational sample_aspect_ratio;
/**
* Video only. The order of the fields in interlaced video.
*/
enum AVFieldOrder field_order;
/**
* Video only. Additional colorspace characteristics.
*/
enum AVColorRange color_range;
enum AVColorPrimaries color_primaries;
enum AVColorTransferCharacteristic color_trc;
enum AVColorSpace color_space;
enum AVChromaLocation chroma_location;
/**
* Audio only. The channel layout bitmask. May be 0 if the channel layout is
* unknown or unspecified, otherwise the number of bits set must be equal to
* the channels field.
*/
uint64_t channel_layout;
/**
* Audio only. The number of audio channels.
*/
int channels;
/**
* Audio only. The number of audio samples per second.
*/
int sample_rate;
/**
* Audio only. The number of bytes per coded audio frame, required by some
* formats.
*
* Corresponds to nBlockAlign in WAVEFORMATEX.
*/
int block_align;
/**
* Audio only. The amount of padding (in samples) inserted by the encoder at
* the beginning of the audio. I.e. this number of leading decoded samples
* must be discarded by the caller to get the original audio without leading
* padding.
*/
int initial_padding;
/**
* Audio only. The amount of padding (in samples) appended by the encoder to
* the end of the audio. I.e. this number of decoded samples must be
* discarded by the caller from the end of the stream to get the original
* audio without any trailing padding.
*/
int trailing_padding;
} AVCodecParameters;
/**
* If c is NULL, returns the first registered codec,
* if c is non-NULL, returns the next registered codec after c,
* or NULL if c is the last one.
*/
AVCodec *av_codec_next(const AVCodec *c);
/**
* Return the LIBAVCODEC_VERSION_INT constant.
*/
unsigned avcodec_version(void);
/**
* Return the libavcodec build-time configuration.
*/
const char *avcodec_configuration(void);
/**
* Return the libavcodec license.
*/
const char *avcodec_license(void);
/**
* Register the codec codec and initialize libavcodec.
*
* @warning either this function or avcodec_register_all() must be called
* before any other libavcodec functions.
*
* @see avcodec_register_all()
*/
void avcodec_register(AVCodec *codec);
/**
* Register all the codecs, parsers and bitstream filters which were enabled at
* configuration time. If you do not call this function you can select exactly
* which formats you want to support, by using the individual registration
* functions.
*
* @see avcodec_register
* @see av_register_codec_parser
* @see av_register_bitstream_filter
*/
void avcodec_register_all(void);
/**
* Allocate an AVCodecContext and set its fields to default values. The
* resulting struct should be freed with avcodec_free_context().
*
* @param codec if non-NULL, allocate private data and initialize defaults
* for the given codec. It is illegal to then call avcodec_open2()
* with a different codec.
* If NULL, then the codec-specific defaults won't be initialized,
* which may result in suboptimal default settings (this is
* important mainly for encoders, e.g. libx264).
*
* @return An AVCodecContext filled with default values or NULL on failure.
*/
AVCodecContext *avcodec_alloc_context3(const AVCodec *codec);
/**
* Free the codec context and everything associated with it and write NULL to
* the provided pointer.
*/
void avcodec_free_context(AVCodecContext **avctx);
#if FF_API_GET_CONTEXT_DEFAULTS
/**
* @deprecated This function should not be used, as closing and opening a codec
* context multiple time is not supported. A new codec context should be
* allocated for each new use.
*/
int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec);
#endif
/**
* Get the AVClass for AVCodecContext. It can be used in combination with
* AV_OPT_SEARCH_FAKE_OBJ for examining options.
*
* @see av_opt_find().
*/
const AVClass *avcodec_get_class(void);
#if FF_API_COPY_CONTEXT
/**
* Copy the settings of the source AVCodecContext into the destination
* AVCodecContext. The resulting destination codec context will be
* unopened, i.e. you are required to call avcodec_open2() before you
* can use this AVCodecContext to decode/encode video/audio data.
*
* @param dest target codec context, should be initialized with
* avcodec_alloc_context3(), but otherwise uninitialized
* @param src source codec context
* @return AVERROR() on error (e.g. memory allocation error), 0 on success
*
* @deprecated The semantics of this function are ill-defined and it should not
* be used. If you need to transfer the stream parameters from one codec context
* to another, use an intermediate AVCodecParameters instance and the
* avcodec_parameters_from_context() / avcodec_parameters_to_context()
* functions.
*/
attribute_deprecated
int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
#endif
/**
* Allocate a new AVCodecParameters and set its fields to default values
* (unknown/invalid/0). The returned struct must be freed with
* avcodec_parameters_free().
*/
AVCodecParameters *avcodec_parameters_alloc(void);
/**
* Free an AVCodecParameters instance and everything associated with it and
* write NULL to the supplied pointer.
*/
void avcodec_parameters_free(AVCodecParameters **par);
/**
* Copy the contents of src to dst. Any allocated fields in dst are freed and
* replaced with newly allocated duplicates of the corresponding fields in src.
*
* @return >= 0 on success, a negative AVERROR code on failure.
*/
int avcodec_parameters_copy(AVCodecParameters *dst, const AVCodecParameters *src);
/**
* Fill the parameters struct based on the values from the supplied codec
* context. Any allocated fields in par are freed and replaced with duplicates
* of the corresponding fields in codec.
*
* @return >= 0 on success, a negative AVERROR code on failure
*/
int avcodec_parameters_from_context(AVCodecParameters *par,
const AVCodecContext *codec);
/**
* Fill the codec context based on the values from the supplied codec
* parameters. Any allocated fields in codec that have a corresponding field in
* par are freed and replaced with duplicates of the corresponding field in par.
* Fields in codec that do not have a counterpart in par are not touched.
*
* @return >= 0 on success, a negative AVERROR code on failure.
*/
int avcodec_parameters_to_context(AVCodecContext *codec,
const AVCodecParameters *par);
/**
* Initialize the AVCodecContext to use the given AVCodec. Prior to using this
* function the context has to be allocated with avcodec_alloc_context3().
*
* The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
* avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
* retrieving a codec.
*
* @warning This function is not thread safe!
*
* @note Always call this function before using decoding routines (such as
* @ref avcodec_receive_frame()).
*
* @code
* avcodec_register_all();
* av_dict_set(&opts, "b", "2.5M", 0);
* codec = avcodec_find_decoder(AV_CODEC_ID_H264);
* if (!codec)
* exit(1);
*
* context = avcodec_alloc_context3(codec);
*
* if (avcodec_open2(context, codec, opts) < 0)
* exit(1);
* @endcode
*
* @param avctx The context to initialize.
* @param codec The codec to open this context for. If a non-NULL codec has been
* previously passed to avcodec_alloc_context3() or
* for this context, then this parameter MUST be either NULL or
* equal to the previously passed codec.
* @param options A dictionary filled with AVCodecContext and codec-private options.
* On return this object will be filled with options that were not found.
*
* @return zero on success, a negative value on error
* @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
* av_dict_set(), av_opt_find().
*/
int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options);
/**
* Close a given AVCodecContext and free all the data associated with it
* (but not the AVCodecContext itself).
*
* Calling this function on an AVCodecContext that hasn't been opened will free
* the codec-specific data allocated in avcodec_alloc_context3() with a non-NULL
* codec. Subsequent calls will do nothing.
*
* @note Do not use this function. Use avcodec_free_context() to destroy a
* codec context (either open or closed). Opening and closing a codec context
* multiple times is not supported anymore -- use multiple codec contexts
* instead.
*/
int avcodec_close(AVCodecContext *avctx);
/**
* Free all allocated data in the given subtitle struct.
*
* @param sub AVSubtitle to free.
*/
void avsubtitle_free(AVSubtitle *sub);
/**
* @}
*/
/**
* @addtogroup lavc_packet
* @{
*/
/**
* Allocate an AVPacket and set its fields to default values. The resulting
* struct must be freed using av_packet_free().
*
* @return An AVPacket filled with default values or NULL on failure.
*
* @note this only allocates the AVPacket itself, not the data buffers. Those
* must be allocated through other means such as av_new_packet.
*
* @see av_new_packet
*/
AVPacket *av_packet_alloc(void);
/**
* Create a new packet that references the same data as src.
*
* This is a shortcut for av_packet_alloc()+av_packet_ref().
*
* @return newly created AVPacket on success, NULL on error.
*
* @see av_packet_alloc
* @see av_packet_ref
*/
AVPacket *av_packet_clone(const AVPacket *src);
/**
* Free the packet, if the packet is reference counted, it will be
* unreferenced first.
*
* @param pkt packet to be freed. The pointer will be set to NULL.
* @note passing NULL is a no-op.
*/
void av_packet_free(AVPacket **pkt);
/**
* Initialize optional fields of a packet with default values.
*
* Note, this does not touch the data and size members, which have to be
* initialized separately.
*
* @param pkt packet
*/
void av_init_packet(AVPacket *pkt);
/**
* Allocate the payload of a packet and initialize its fields with
* default values.
*
* @param pkt packet
* @param size wanted payload size
* @return 0 if OK, AVERROR_xxx otherwise
*/
int av_new_packet(AVPacket *pkt, int size);
/**
* Reduce packet size, correctly zeroing padding
*
* @param pkt packet
* @param size new size
*/
void av_shrink_packet(AVPacket *pkt, int size);
/**
* Increase packet size, correctly zeroing padding
*
* @param pkt packet
* @param grow_by number of bytes by which to increase the size of the packet
*/
int av_grow_packet(AVPacket *pkt, int grow_by);
/**
* Initialize a reference-counted packet from av_malloc()ed data.
*
* @param pkt packet to be initialized. This function will set the data, size,
* buf and destruct fields, all others are left untouched.
* @param data Data allocated by av_malloc() to be used as packet data. If this
* function returns successfully, the data is owned by the underlying AVBuffer.
* The caller may not access the data through other means.
* @param size size of data in bytes, without the padding. I.e. the full buffer
* size is assumed to be size + AV_INPUT_BUFFER_PADDING_SIZE.
*
* @return 0 on success, a negative AVERROR on error
*/
int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size);
#if FF_API_AVPACKET_OLD_API
/**
* @warning This is a hack - the packet memory allocation stuff is broken. The
* packet is allocated if it was not really allocated.
*
* @deprecated Use av_packet_ref
*/
attribute_deprecated
int av_dup_packet(AVPacket *pkt);
/**
* Free a packet.
*
* @deprecated Use av_packet_unref
*
* @param pkt packet to free
*/
attribute_deprecated
void av_free_packet(AVPacket *pkt);
#endif
/**
* Allocate new information of a packet.
*
* @param pkt packet
* @param type side information type
* @param size side information size
* @return pointer to fresh allocated data or NULL otherwise
*/
uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
int size);
/**
* Wrap an existing array as a packet side data.
*
* @param pkt packet
* @param type side information type
* @param data the side data array. It must be allocated with the av_malloc()
* family of functions. The ownership of the data is transferred to
* pkt.
* @param size side information size
* @return a non-negative number on success, a negative AVERROR code on
* failure. On failure, the packet is unchanged and the data remains
* owned by the caller.
*/
int av_packet_add_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
uint8_t *data, size_t size);
/**
* Shrink the already allocated side data buffer
*
* @param pkt packet
* @param type side information type
* @param size new side information size
* @return 0 on success, < 0 on failure
*/
int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
int size);
/**
* Get side information from packet.
*
* @param pkt packet
* @param type desired side information type
* @param size pointer for side information size to store (optional)
* @return pointer to data if present or NULL otherwise
*/
uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
int *size);
/**
* Convenience function to free all the side data stored.
* All the other fields stay untouched.
*
* @param pkt packet
*/
void av_packet_free_side_data(AVPacket *pkt);
/**
* Setup a new reference to the data described by a given packet
*
* If src is reference-counted, setup dst as a new reference to the
* buffer in src. Otherwise allocate a new buffer in dst and copy the
* data from src into it.
*
* All the other fields are copied from src.
*
* @see av_packet_unref
*
* @param dst Destination packet
* @param src Source packet
*
* @return 0 on success, a negative AVERROR on error.
*/
int av_packet_ref(AVPacket *dst, const AVPacket *src);
/**
* Wipe the packet.
*
* Unreference the buffer referenced by the packet and reset the
* remaining packet fields to their default values.
*
* @param pkt The packet to be unreferenced.
*/
void av_packet_unref(AVPacket *pkt);
/**
* Move every field in src to dst and reset src.
*
* @see av_packet_unref
*
* @param src Source packet, will be reset
* @param dst Destination packet
*/
void av_packet_move_ref(AVPacket *dst, AVPacket *src);
/**
* Copy only "properties" fields from src to dst.
*
* Properties for the purpose of this function are all the fields
* beside those related to the packet data (buf, data, size)
*
* @param dst Destination packet
* @param src Source packet
*
* @return 0 on success AVERROR on failure.
*/
int av_packet_copy_props(AVPacket *dst, const AVPacket *src);
/**
* Convert valid timing fields (timestamps / durations) in a packet from one
* timebase to another. Timestamps with unknown values (AV_NOPTS_VALUE) will be
* ignored.
*
* @param pkt packet on which the conversion will be performed
* @param tb_src source timebase, in which the timing fields in pkt are
* expressed
* @param tb_dst destination timebase, to which the timing fields will be
* converted
*/
void av_packet_rescale_ts(AVPacket *pkt, AVRational tb_src, AVRational tb_dst);
/**
* @}
*/
/**
* @addtogroup lavc_decoding
* @{
*/
/**
* Find a registered decoder with a matching codec ID.
*
* @param id AVCodecID of the requested decoder
* @return A decoder if one was found, NULL otherwise.
*/
AVCodec *avcodec_find_decoder(enum AVCodecID id);
/**
* Find a registered decoder with the specified name.
*
* @param name name of the requested decoder
* @return A decoder if one was found, NULL otherwise.
*/
AVCodec *avcodec_find_decoder_by_name(const char *name);
/**
* The default callback for AVCodecContext.get_buffer2(). It is made public so
* it can be called by custom get_buffer2() implementations for decoders without
* AV_CODEC_CAP_DR1 set.
*/
int avcodec_default_get_buffer2(AVCodecContext *s, AVFrame *frame, int flags);
#if FF_API_EMU_EDGE
/**
* Return the amount of padding in pixels which the get_buffer callback must
* provide around the edge of the image for codecs which do not have the
* CODEC_FLAG_EMU_EDGE flag.
*
* @return Required padding in pixels.
*
* @deprecated CODEC_FLAG_EMU_EDGE is deprecated, so this function is no longer
* needed
*/
attribute_deprecated
unsigned avcodec_get_edge_width(void);
#endif
/**
* Modify width and height values so that they will result in a memory
* buffer that is acceptable for the codec if you do not use any horizontal
* padding.
*
* May only be used if a codec with AV_CODEC_CAP_DR1 has been opened.
*/
void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
/**
* Modify width and height values so that they will result in a memory
* buffer that is acceptable for the codec if you also ensure that all
* line sizes are a multiple of the respective linesize_align[i].
*
* May only be used if a codec with AV_CODEC_CAP_DR1 has been opened.
*/
void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
int linesize_align[AV_NUM_DATA_POINTERS]);
/**
* Decode the audio frame of size avpkt->size from avpkt->data into frame.
*
* Some decoders may support multiple frames in a single AVPacket. Such
* decoders would then just decode the first frame and the return value would be
* less than the packet size. In this case, avcodec_decode_audio4 has to be
* called again with an AVPacket containing the remaining data in order to
* decode the second frame, etc... Even if no frames are returned, the packet
* needs to be fed to the decoder with remaining data until it is completely
* consumed or an error occurs.
*
* Some decoders (those marked with AV_CODEC_CAP_DELAY) have a delay between input
* and output. This means that for some packets they will not immediately
* produce decoded output and need to be flushed at the end of decoding to get
* all the decoded data. Flushing is done by calling this function with packets
* with avpkt->data set to NULL and avpkt->size set to 0 until it stops
* returning samples. It is safe to flush even those decoders that are not
* marked with AV_CODEC_CAP_DELAY, then no samples will be returned.
*
* @warning The input buffer, avpkt->data must be AV_INPUT_BUFFER_PADDING_SIZE
* larger than the actual read bytes because some optimized bitstream
* readers read 32 or 64 bits at once and could read over the end.
*
* @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
* before packets may be fed to the decoder.
*
* @param avctx the codec context
* @param[out] frame The AVFrame in which to store decoded audio samples.
* The decoder will allocate a buffer for the decoded frame by
* calling the AVCodecContext.get_buffer2() callback.
* When AVCodecContext.refcounted_frames is set to 1, the frame is
* reference counted and the returned reference belongs to the
* caller. The caller must release the frame using av_frame_unref()
* when the frame is no longer needed. The caller may safely write
* to the frame if av_frame_is_writable() returns 1.
* When AVCodecContext.refcounted_frames is set to 0, the returned
* reference belongs to the decoder and is valid only until the
* next call to this function or until closing or flushing the
* decoder. The caller may not write to it.
* @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is
* non-zero. Note that this field being set to zero
* does not mean that an error has occurred. For
* decoders with AV_CODEC_CAP_DELAY set, no given decode
* call is guaranteed to produce a frame.
* @param[in] avpkt The input AVPacket containing the input buffer.
* At least avpkt->data and avpkt->size should be set. Some
* decoders might also require additional fields to be set.
* @return A negative error code is returned if an error occurred during
* decoding, otherwise the number of bytes consumed from the input
* AVPacket is returned.
*
* @deprecated Use avcodec_send_packet() and avcodec_receive_frame().
*/
attribute_deprecated
int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame,
int *got_frame_ptr, AVPacket *avpkt);
/**
* Decode the video frame of size avpkt->size from avpkt->data into picture.
* Some decoders may support multiple frames in a single AVPacket, such
* decoders would then just decode the first frame.
*
* @warning The input buffer must be AV_INPUT_BUFFER_PADDING_SIZE larger than
* the actual read bytes because some optimized bitstream readers read 32 or 64
* bits at once and could read over the end.
*
* @warning The end of the input buffer buf should be set to 0 to ensure that
* no overreading happens for damaged MPEG streams.
*
* @note Codecs which have the AV_CODEC_CAP_DELAY capability set have a delay
* between input and output, these need to be fed with avpkt->data=NULL,
* avpkt->size=0 at the end to return the remaining frames.
*
* @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
* before packets may be fed to the decoder.
*
* @param avctx the codec context
* @param[out] picture The AVFrame in which the decoded video frame will be stored.
* Use av_frame_alloc() to get an AVFrame. The codec will
* allocate memory for the actual bitmap by calling the
* AVCodecContext.get_buffer2() callback.
* When AVCodecContext.refcounted_frames is set to 1, the frame is
* reference counted and the returned reference belongs to the
* caller. The caller must release the frame using av_frame_unref()
* when the frame is no longer needed. The caller may safely write
* to the frame if av_frame_is_writable() returns 1.
* When AVCodecContext.refcounted_frames is set to 0, the returned
* reference belongs to the decoder and is valid only until the
* next call to this function or until closing or flushing the
* decoder. The caller may not write to it.
*
* @param[in] avpkt The input AVPacket containing the input buffer.
* You can create such packet with av_init_packet() and by then setting
* data and size, some decoders might in addition need other fields like
* flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
* fields possible.
* @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
* @return On error a negative value is returned, otherwise the number of bytes
* used or zero if no frame could be decompressed.
*
* @deprecated Use avcodec_send_packet() and avcodec_receive_frame().
*/
attribute_deprecated
int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
int *got_picture_ptr,
AVPacket *avpkt);
/**
* Decode a subtitle message.
* Return a negative value on error, otherwise return the number of bytes used.
* If no subtitle could be decompressed, got_sub_ptr is zero.
* Otherwise, the subtitle is stored in *sub.
* Note that AV_CODEC_CAP_DR1 is not available for subtitle codecs. This is for
* simplicity, because the performance difference is expect to be negligible
* and reusing a get_buffer written for video codecs would probably perform badly
* due to a potentially very different allocation pattern.
*
* @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
* before packets may be fed to the decoder.
*
* @param avctx the codec context
* @param[out] sub The AVSubtitle in which the decoded subtitle will be stored, must be
freed with avsubtitle_free if *got_sub_ptr is set.
* @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
* @param[in] avpkt The input AVPacket containing the input buffer.
*/
int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
int *got_sub_ptr,
AVPacket *avpkt);
/**
* Supply raw packet data as input to a decoder.
*
* Internally, this call will copy relevant AVCodecContext fields, which can
* influence decoding per-packet, and apply them when the packet is actually
* decoded. (For example AVCodecContext.skip_frame, which might direct the
* decoder to drop the frame contained by the packet sent with this function.)
*
* @warning The input buffer, avpkt->data must be AV_INPUT_BUFFER_PADDING_SIZE
* larger than the actual read bytes because some optimized bitstream
* readers read 32 or 64 bits at once and could read over the end.
*
* @warning Do not mix this API with the legacy API (like avcodec_decode_video2())
* on the same AVCodecContext. It will return unexpected results now
* or in future libavcodec versions.
*
* @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
* before packets may be fed to the decoder.
*
* @param avctx codec context
* @param[in] avpkt The input AVPacket. Usually, this will be a single video
* frame, or several complete audio frames.
* Ownership of the packet remains with the caller, and the
* decoder will not write to the packet. The decoder may create
* a reference to the packet data (or copy it if the packet is
* not reference-counted).
* Unlike with older APIs, the packet is always fully consumed,
* and if it contains multiple frames (e.g. some audio codecs),
* will require you to call avcodec_receive_frame() multiple
* times afterwards before you can send a new packet.
* It can be NULL (or an AVPacket with data set to NULL and
* size set to 0); in this case, it is considered a flush
* packet, which signals the end of the stream. Sending the
* first flush packet will return success. Subsequent ones are
* unnecessary and will return AVERROR_EOF. If the decoder
* still has frames buffered, it will return them after sending
* a flush packet.
*
* @return 0 on success, otherwise negative error code:
* AVERROR(EAGAIN): input is not accepted right now - the packet must be
* resent after trying to read output
* AVERROR_EOF: the decoder has been flushed, and no new packets can
* be sent to it (also returned if more than 1 flush
* packet is sent)
* AVERROR(EINVAL): codec not opened, it is an encoder, or requires flush
* AVERROR(ENOMEM): failed to add packet to internal queue, or similar
* other errors: legitimate decoding errors
*/
int avcodec_send_packet(AVCodecContext *avctx, const AVPacket *avpkt);
/**
* Return decoded output data from a decoder.
*
* @param avctx codec context
* @param frame This will be set to a reference-counted video or audio
* frame (depending on the decoder type) allocated by the
* decoder. Note that the function will always call
* av_frame_unref(frame) before doing anything else.
*
* @return
* 0: success, a frame was returned
* AVERROR(EAGAIN): output is not available right now - user must try
* to send new input
* AVERROR_EOF: the decoder has been fully flushed, and there will be
* no more output frames
* AVERROR(EINVAL): codec not opened, or it is an encoder
* other negative values: legitimate decoding errors
*/
int avcodec_receive_frame(AVCodecContext *avctx, AVFrame *frame);
/**
* Supply a raw video or audio frame to the encoder. Use avcodec_receive_packet()
* to retrieve buffered output packets.
*
* @param avctx codec context
* @param[in] frame AVFrame containing the raw audio or video frame to be encoded.
* Ownership of the frame remains with the caller, and the
* encoder will not write to the frame. The encoder may create
* a reference to the frame data (or copy it if the frame is
* not reference-counted).
* It can be NULL, in which case it is considered a flush
* packet. This signals the end of the stream. If the encoder
* still has packets buffered, it will return them after this
* call. Once flushing mode has been entered, additional flush
* packets are ignored, and sending frames will return
* AVERROR_EOF.
*
* For audio:
* If AV_CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
* can have any number of samples.
* If it is not set, frame->nb_samples must be equal to
* avctx->frame_size for all frames except the last.
* The final frame may be smaller than avctx->frame_size.
* @return 0 on success, otherwise negative error code:
* AVERROR(EAGAIN): input is not accepted right now - the frame must be
* resent after trying to read output packets
* AVERROR_EOF: the encoder has been flushed, and no new frames can
* be sent to it
* AVERROR(EINVAL): codec not opened, refcounted_frames not set, it is a
* decoder, or requires flush
* AVERROR(ENOMEM): failed to add packet to internal queue, or similar
* other errors: legitimate decoding errors
*/
int avcodec_send_frame(AVCodecContext *avctx, const AVFrame *frame);
/**
* Read encoded data from the encoder.
*
* @param avctx codec context
* @param avpkt This will be set to a reference-counted packet allocated by the
* encoder. Note that the function will always call
* av_frame_unref(frame) before doing anything else.
* @return 0 on success, otherwise negative error code:
* AVERROR(EAGAIN): output is not available right now - user must try
* to send input
* AVERROR_EOF: the encoder has been fully flushed, and there will be
* no more output packets
* AVERROR(EINVAL): codec not opened, or it is an encoder
* other errors: legitimate decoding errors
*/
int avcodec_receive_packet(AVCodecContext *avctx, AVPacket *avpkt);
/**
* @defgroup lavc_parsing Frame parsing
* @{
*/
enum AVPictureStructure {
AV_PICTURE_STRUCTURE_UNKNOWN, //< unknown
AV_PICTURE_STRUCTURE_TOP_FIELD, //< coded as top field
AV_PICTURE_STRUCTURE_BOTTOM_FIELD, //< coded as bottom field
AV_PICTURE_STRUCTURE_FRAME, //< coded as frame
};
typedef struct AVCodecParserContext {
void *priv_data;
struct AVCodecParser *parser;
int64_t frame_offset; /* offset of the current frame */
int64_t cur_offset; /* current offset
(incremented by each av_parser_parse()) */
int64_t next_frame_offset; /* offset of the next frame */
/* video info */
int pict_type; /* XXX: Put it back in AVCodecContext. */
/**
* This field is used for proper frame duration computation in lavf.
* It signals, how much longer the frame duration of the current frame
* is compared to normal frame duration.
*
* frame_duration = (1 + repeat_pict) * time_base
*
* It is used by codecs like H.264 to display telecined material.
*/
int repeat_pict; /* XXX: Put it back in AVCodecContext. */
int64_t pts; /* pts of the current frame */
int64_t dts; /* dts of the current frame */
/* private data */
int64_t last_pts;
int64_t last_dts;
int fetch_timestamp;
#define AV_PARSER_PTS_NB 4
int cur_frame_start_index;
int64_t cur_frame_offset[AV_PARSER_PTS_NB];
int64_t cur_frame_pts[AV_PARSER_PTS_NB];
int64_t cur_frame_dts[AV_PARSER_PTS_NB];
int flags;
#define PARSER_FLAG_COMPLETE_FRAMES 0x0001
#define PARSER_FLAG_ONCE 0x0002
/// Set if the parser has a valid file offset
#define PARSER_FLAG_FETCHED_OFFSET 0x0004
int64_t offset; ///< byte offset from starting packet start
int64_t cur_frame_end[AV_PARSER_PTS_NB];
/**
* Set by parser to 1 for key frames and 0 for non-key frames.
* It is initialized to -1, so if the parser doesn't set this flag,
* old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
* will be used.
*/
int key_frame;
#if FF_API_CONVERGENCE_DURATION
/**
* @deprecated unused
*/
attribute_deprecated
int64_t convergence_duration;
#endif
// Timestamp generation support:
/**
* Synchronization point for start of timestamp generation.
*
* Set to >0 for sync point, 0 for no sync point and <0 for undefined
* (default).
*
* For example, this corresponds to presence of H.264 buffering period
* SEI message.
*/
int dts_sync_point;
/**
* Offset of the current timestamp against last timestamp sync point in
* units of AVCodecContext.time_base.
*
* Set to INT_MIN when dts_sync_point unused. Otherwise, it must
* contain a valid timestamp offset.
*
* Note that the timestamp of sync point has usually a nonzero
* dts_ref_dts_delta, which refers to the previous sync point. Offset of
* the next frame after timestamp sync point will be usually 1.
*
* For example, this corresponds to H.264 cpb_removal_delay.
*/
int dts_ref_dts_delta;
/**
* Presentation delay of current frame in units of AVCodecContext.time_base.
*
* Set to INT_MIN when dts_sync_point unused. Otherwise, it must
* contain valid non-negative timestamp delta (presentation time of a frame
* must not lie in the past).
*
* This delay represents the difference between decoding and presentation
* time of the frame.
*
* For example, this corresponds to H.264 dpb_output_delay.
*/
int pts_dts_delta;
/**
* Position of the packet in file.
*
* Analogous to cur_frame_pts/dts
*/
int64_t cur_frame_pos[AV_PARSER_PTS_NB];
/**
* Byte position of currently parsed frame in stream.
*/
int64_t pos;
/**
* Previous frame byte position.
*/
int64_t last_pos;
/**
* Duration of the current frame.
* For audio, this is in units of 1 / AVCodecContext.sample_rate.
* For all other types, this is in units of AVCodecContext.time_base.
*/
int duration;
enum AVFieldOrder field_order;
/**
* Indicate whether a picture is coded as a frame, top field or bottom field.
*
* For example, H.264 field_pic_flag equal to 0 corresponds to
* AV_PICTURE_STRUCTURE_FRAME. An H.264 picture with field_pic_flag
* equal to 1 and bottom_field_flag equal to 0 corresponds to
* AV_PICTURE_STRUCTURE_TOP_FIELD.
*/
enum AVPictureStructure picture_structure;
/**
* Picture number incremented in presentation or output order.
* This field may be reinitialized at the first picture of a new sequence.
*
* For example, this corresponds to H.264 PicOrderCnt.
*/
int output_picture_number;
/**
* Dimensions of the decoded video intended for presentation.
*/
int width;
int height;
/**
* Dimensions of the coded video.
*/
int coded_width;
int coded_height;
/**
* The format of the coded data, corresponds to enum AVPixelFormat for video
* and for enum AVSampleFormat for audio.
*
* Note that a decoder can have considerable freedom in how exactly it
* decodes the data, so the format reported here might be different from the
* one returned by a decoder.
*/
int format;
} AVCodecParserContext;
typedef struct AVCodecParser {
int codec_ids[5]; /* several codec IDs are permitted */
int priv_data_size;
int (*parser_init)(AVCodecParserContext *s);
/* This callback never returns an error, a negative value means that
* the frame start was in a previous packet. */
int (*parser_parse)(AVCodecParserContext *s,
AVCodecContext *avctx,
const uint8_t **poutbuf, int *poutbuf_size,
const uint8_t *buf, int buf_size);
void (*parser_close)(AVCodecParserContext *s);
int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
struct AVCodecParser *next;
} AVCodecParser;
AVCodecParser *av_parser_next(const AVCodecParser *c);
void av_register_codec_parser(AVCodecParser *parser);
AVCodecParserContext *av_parser_init(int codec_id);
/**
* Parse a packet.
*
* @param s parser context.
* @param avctx codec context.
* @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
* @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
* @param buf input buffer.
* @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
* @param pts input presentation timestamp.
* @param dts input decoding timestamp.
* @param pos input byte position in stream.
* @return the number of bytes of the input bitstream used.
*
* Example:
* @code
* while(in_len){
* len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
* in_data, in_len,
* pts, dts, pos);
* in_data += len;
* in_len -= len;
*
* if(size)
* decode_frame(data, size);
* }
* @endcode
*/
int av_parser_parse2(AVCodecParserContext *s,
AVCodecContext *avctx,
uint8_t **poutbuf, int *poutbuf_size,
const uint8_t *buf, int buf_size,
int64_t pts, int64_t dts,
int64_t pos);
/**
* @return 0 if the output buffer is a subset of the input, 1 if it is allocated and must be freed
* @deprecated use AVBitstreamFilter
*/
int av_parser_change(AVCodecParserContext *s,
AVCodecContext *avctx,
uint8_t **poutbuf, int *poutbuf_size,
const uint8_t *buf, int buf_size, int keyframe);
void av_parser_close(AVCodecParserContext *s);
/**
* @}
* @}
*/
/**
* @addtogroup lavc_encoding
* @{
*/
/**
* Find a registered encoder with a matching codec ID.
*
* @param id AVCodecID of the requested encoder
* @return An encoder if one was found, NULL otherwise.
*/
AVCodec *avcodec_find_encoder(enum AVCodecID id);
/**
* Find a registered encoder with the specified name.
*
* @param name name of the requested encoder
* @return An encoder if one was found, NULL otherwise.
*/
AVCodec *avcodec_find_encoder_by_name(const char *name);
/**
* Encode a frame of audio.
*
* Takes input samples from frame and writes the next output packet, if
* available, to avpkt. The output packet does not necessarily contain data for
* the most recent frame, as encoders can delay, split, and combine input frames
* internally as needed.
*
* @param avctx codec context
* @param avpkt output AVPacket.
* The user can supply an output buffer by setting
* avpkt->data and avpkt->size prior to calling the
* function, but if the size of the user-provided data is not
* large enough, encoding will fail. All other AVPacket fields
* will be reset by the encoder using av_init_packet(). If
* avpkt->data is NULL, the encoder will allocate it.
* The encoder will set avpkt->size to the size of the
* output packet.
*
* If this function fails or produces no output, avpkt will be
* freed using av_packet_unref().
* @param[in] frame AVFrame containing the raw audio data to be encoded.
* May be NULL when flushing an encoder that has the
* AV_CODEC_CAP_DELAY capability set.
* If AV_CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
* can have any number of samples.
* If it is not set, frame->nb_samples must be equal to
* avctx->frame_size for all frames except the last.
* The final frame may be smaller than avctx->frame_size.
* @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
* output packet is non-empty, and to 0 if it is
* empty. If the function returns an error, the
* packet can be assumed to be invalid, and the
* value of got_packet_ptr is undefined and should
* not be used.
* @return 0 on success, negative error code on failure
*
* @deprecated use avcodec_send_frame()/avcodec_receive_packet() instead
*/
attribute_deprecated
int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt,
const AVFrame *frame, int *got_packet_ptr);
/**
* Encode a frame of video.
*
* Takes input raw video data from frame and writes the next output packet, if
* available, to avpkt. The output packet does not necessarily contain data for
* the most recent frame, as encoders can delay and reorder input frames
* internally as needed.
*
* @param avctx codec context
* @param avpkt output AVPacket.
* The user can supply an output buffer by setting
* avpkt->data and avpkt->size prior to calling the
* function, but if the size of the user-provided data is not
* large enough, encoding will fail. All other AVPacket fields
* will be reset by the encoder using av_init_packet(). If
* avpkt->data is NULL, the encoder will allocate it.
* The encoder will set avpkt->size to the size of the
* output packet. The returned data (if any) belongs to the
* caller, he is responsible for freeing it.
*
* If this function fails or produces no output, avpkt will be
* freed using av_packet_unref().
* @param[in] frame AVFrame containing the raw video data to be encoded.
* May be NULL when flushing an encoder that has the
* AV_CODEC_CAP_DELAY capability set.
* @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
* output packet is non-empty, and to 0 if it is
* empty. If the function returns an error, the
* packet can be assumed to be invalid, and the
* value of got_packet_ptr is undefined and should
* not be used.
* @return 0 on success, negative error code on failure
*
* @deprecated use avcodec_send_frame()/avcodec_receive_packet() instead
*/
attribute_deprecated
int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt,
const AVFrame *frame, int *got_packet_ptr);
int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
const AVSubtitle *sub);
/**
* @}
*/
#if FF_API_AVPICTURE
/**
* @addtogroup lavc_picture
* @{
*/
/**
* @deprecated unused
*/
attribute_deprecated
int avpicture_alloc(AVPicture *picture, enum AVPixelFormat pix_fmt, int width, int height);
/**
* @deprecated unused
*/
attribute_deprecated
void avpicture_free(AVPicture *picture);
/**
* @deprecated use av_image_fill_arrays() instead.
*/
attribute_deprecated
int avpicture_fill(AVPicture *picture, uint8_t *ptr,
enum AVPixelFormat pix_fmt, int width, int height);
/**
* @deprecated use av_image_copy_to_buffer() instead.
*/
attribute_deprecated
int avpicture_layout(const AVPicture* src, enum AVPixelFormat pix_fmt,
int width, int height,
unsigned char *dest, int dest_size);
/**
* @deprecated use av_image_get_buffer_size() instead.
*/
attribute_deprecated
int avpicture_get_size(enum AVPixelFormat pix_fmt, int width, int height);
/**
* @deprecated av_image_copy() instead.
*/
attribute_deprecated
void av_picture_copy(AVPicture *dst, const AVPicture *src,
enum AVPixelFormat pix_fmt, int width, int height);
/**
* @deprecated unused
*/
attribute_deprecated
int av_picture_crop(AVPicture *dst, const AVPicture *src,
enum AVPixelFormat pix_fmt, int top_band, int left_band);
/**
* @deprecated unused
*/
attribute_deprecated
int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum AVPixelFormat pix_fmt,
int padtop, int padbottom, int padleft, int padright, int *color);
/**
* @}
*/
#endif
/**
* @defgroup lavc_misc Utility functions
* @ingroup libavc
*
* Miscellaneous utility functions related to both encoding and decoding
* (or neither).
* @{
*/
/**
* @defgroup lavc_misc_pixfmt Pixel formats
*
* Functions for working with pixel formats.
* @{
*/
/**
* @deprecated Use av_pix_fmt_get_chroma_sub_sample
*/
void attribute_deprecated avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift);
/**
* Return a value representing the fourCC code associated to the
* pixel format pix_fmt, or 0 if no associated fourCC code can be
* found.
*/
unsigned int avcodec_pix_fmt_to_codec_tag(enum AVPixelFormat pix_fmt);
#define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
#define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
#define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
#define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
#define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
#define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
/**
* Compute what kind of losses will occur when converting from one specific
* pixel format to another.
* When converting from one pixel format to another, information loss may occur.
* For example, when converting from RGB24 to GRAY, the color information will
* be lost. Similarly, other losses occur when converting from some formats to
* other formats. These losses can involve loss of chroma, but also loss of
* resolution, loss of color depth, loss due to the color space conversion, loss
* of the alpha bits or loss due to color quantization.
* avcodec_get_fix_fmt_loss() informs you about the various types of losses
* which will occur when converting from one pixel format to another.
*
* @param[in] dst_pix_fmt destination pixel format
* @param[in] src_pix_fmt source pixel format
* @param[in] has_alpha Whether the source pixel format alpha channel is used.
* @return Combination of flags informing you what kind of losses will occur.
*/
int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt, enum AVPixelFormat src_pix_fmt,
int has_alpha);
/**
* Find the best pixel format to convert to given a certain source pixel
* format. When converting from one pixel format to another, information loss
* may occur. For example, when converting from RGB24 to GRAY, the color
* information will be lost. Similarly, other losses occur when converting from
* some formats to other formats. avcodec_find_best_pix_fmt2() searches which of
* the given pixel formats should be used to suffer the least amount of loss.
* The pixel formats from which it chooses one, are determined by the
* pix_fmt_list parameter.
*
*
* @param[in] pix_fmt_list AV_PIX_FMT_NONE terminated array of pixel formats to choose from
* @param[in] src_pix_fmt source pixel format
* @param[in] has_alpha Whether the source pixel format alpha channel is used.
* @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
* @return The best pixel format to convert to or -1 if none was found.
*/
enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat *pix_fmt_list,
enum AVPixelFormat src_pix_fmt,
int has_alpha, int *loss_ptr);
enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
/**
* @}
*/
#if FF_API_SET_DIMENSIONS
/**
* @deprecated this function is not supposed to be used from outside of lavc
*/
attribute_deprecated
void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
#endif
/**
* Put a string representing the codec tag codec_tag in buf.
*
* @param buf buffer to place codec tag in
* @param buf_size size in bytes of buf
* @param codec_tag codec tag to assign
* @return the length of the string that would have been generated if
* enough space had been available, excluding the trailing null
*/
size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
/**
* Return a name for the specified profile, if available.
*
* @param codec the codec that is searched for the given profile
* @param profile the profile value for which a name is requested
* @return A name for the profile if found, NULL otherwise.
*/
const char *av_get_profile_name(const AVCodec *codec, int profile);
/**
* Return a name for the specified profile, if available.
*
* @param codec_id the ID of the codec to which the requested profile belongs
* @param profile the profile value for which a name is requested
* @return A name for the profile if found, NULL otherwise.
*
* @note unlike av_get_profile_name(), which searches a list of profiles
* supported by a specific decoder or encoder implementation, this
* function searches the list of profiles from the AVCodecDescriptor
*/
const char *avcodec_profile_name(enum AVCodecID codec_id, int profile);
int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
//FIXME func typedef
/**
* Fill audio frame data and linesize.
* AVFrame extended_data channel pointers are allocated if necessary for
* planar audio.
*
* @param frame the AVFrame
* frame->nb_samples must be set prior to calling the
* function. This function fills in frame->data,
* frame->extended_data, frame->linesize[0].
* @param nb_channels channel count
* @param sample_fmt sample format
* @param buf buffer to use for frame data
* @param buf_size size of buffer
* @param align plane size sample alignment (0 = default)
* @return 0 on success, negative error code on failure
*/
int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels,
enum AVSampleFormat sample_fmt, const uint8_t *buf,
int buf_size, int align);
/**
* Reset the internal decoder state / flush internal buffers. Should be called
* e.g. when seeking or when switching to a different stream.
*
* @note when refcounted frames are not used (i.e. avctx->refcounted_frames is 0),
* this invalidates the frames previously returned from the decoder. When
* refcounted frames are used, the decoder just releases any references it might
* keep internally, but the caller's reference remains valid.
*/
void avcodec_flush_buffers(AVCodecContext *avctx);
/**
* Return codec bits per sample.
*
* @param[in] codec_id the codec
* @return Number of bits per sample or zero if unknown for the given codec.
*/
int av_get_bits_per_sample(enum AVCodecID codec_id);
/**
* Return codec bits per sample.
* Only return non-zero if the bits per sample is exactly correct, not an
* approximation.
*
* @param[in] codec_id the codec
* @return Number of bits per sample or zero if unknown for the given codec.
*/
int av_get_exact_bits_per_sample(enum AVCodecID codec_id);
/**
* Return audio frame duration.
*
* @param avctx codec context
* @param frame_bytes size of the frame, or 0 if unknown
* @return frame duration, in samples, if known. 0 if not able to
* determine.
*/
int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes);
/**
* This function is the same as av_get_audio_frame_duration(), except it works
* with AVCodecParameters instead of an AVCodecContext.
*/
int av_get_audio_frame_duration2(AVCodecParameters *par, int frame_bytes);
#if FF_API_OLD_BSF
typedef struct AVBitStreamFilterContext {
void *priv_data;
struct AVBitStreamFilter *filter;
AVCodecParserContext *parser;
struct AVBitStreamFilterContext *next;
} AVBitStreamFilterContext;
#endif
typedef struct AVBSFInternal AVBSFInternal;
/**
* The bitstream filter state.
*
* This struct must be allocated with av_bsf_alloc() and freed with
* av_bsf_free().
*
* The fields in the struct will only be changed (by the caller or by the
* filter) as described in their documentation, and are to be considered
* immutable otherwise.
*/
typedef struct AVBSFContext {
/**
* A class for logging and AVOptions
*/
const AVClass *av_class;
/**
* The bitstream filter this context is an instance of.
*/
const struct AVBitStreamFilter *filter;
/**
* Opaque libavcodec internal data. Must not be touched by the caller in any
* way.
*/
AVBSFInternal *internal;
/**
* Opaque filter-specific private data. If filter->priv_class is non-NULL,
* this is an AVOptions-enabled struct.
*/
void *priv_data;
/**
* Parameters of the input stream. This field is allocated in
* av_bsf_alloc(), it needs to be filled by the caller before
* av_bsf_init().
*/
AVCodecParameters *par_in;
/**
* Parameters of the output stream. This field is allocated in
* av_bsf_alloc(), it is set by the filter in av_bsf_init().
*/
AVCodecParameters *par_out;
/**
* The timebase used for the timestamps of the input packets. Set by the
* caller before av_bsf_init().
*/
AVRational time_base_in;
/**
* The timebase used for the timestamps of the output packets. Set by the
* filter in av_bsf_init().
*/
AVRational time_base_out;
} AVBSFContext;
typedef struct AVBitStreamFilter {
const char *name;
/**
* A list of codec ids supported by the filter, terminated by
* AV_CODEC_ID_NONE.
* May be NULL, in that case the bitstream filter works with any codec id.
*/
const enum AVCodecID *codec_ids;
/**
* A class for the private data, used to declare bitstream filter private
* AVOptions. This field is NULL for bitstream filters that do not declare
* any options.
*
* If this field is non-NULL, the first member of the filter private data
* must be a pointer to AVClass, which will be set by libavcodec generic
* code to this class.
*/
const AVClass *priv_class;
/*****************************************************************
* No fields below this line are part of the public API. They
* may not be used outside of libavcodec and can be changed and
* removed at will.
* New public fields should be added right above.
*****************************************************************
*/
int priv_data_size;
int (*init)(AVBSFContext *ctx);
int (*filter)(AVBSFContext *ctx, AVPacket *pkt);
void (*close)(AVBSFContext *ctx);
} AVBitStreamFilter;
#if FF_API_OLD_BSF
/**
* @deprecated the old bitstream filtering API (using AVBitStreamFilterContext)
* is deprecated. Use the new bitstream filtering API (using AVBSFContext).
*/
attribute_deprecated
void av_register_bitstream_filter(AVBitStreamFilter *bsf);
attribute_deprecated
AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
attribute_deprecated
int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
AVCodecContext *avctx, const char *args,
uint8_t **poutbuf, int *poutbuf_size,
const uint8_t *buf, int buf_size, int keyframe);
attribute_deprecated
void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
attribute_deprecated
AVBitStreamFilter *av_bitstream_filter_next(const AVBitStreamFilter *f);
#endif
/**
* @return a bitstream filter with the specified name or NULL if no such
* bitstream filter exists.
*/
const AVBitStreamFilter *av_bsf_get_by_name(const char *name);
/**
* Iterate over all registered bitstream filters.
*
* @param opaque a pointer where libavcodec will store the iteration state. Must
* point to NULL to start the iteration.
*
* @return the next registered bitstream filter or NULL when the iteration is
* finished
*/
const AVBitStreamFilter *av_bsf_next(void **opaque);
/**
* Allocate a context for a given bitstream filter. The caller must fill in the
* context parameters as described in the documentation and then call
* av_bsf_init() before sending any data to the filter.
*
* @param filter the filter for which to allocate an instance.
* @param ctx a pointer into which the pointer to the newly-allocated context
* will be written. It must be freed with av_bsf_free() after the
* filtering is done.
*
* @return 0 on success, a negative AVERROR code on failure
*/
int av_bsf_alloc(const AVBitStreamFilter *filter, AVBSFContext **ctx);
/**
* Prepare the filter for use, after all the parameters and options have been
* set.
*/
int av_bsf_init(AVBSFContext *ctx);
/**
* Submit a packet for filtering.
*
* After sending each packet, the filter must be completely drained by calling
* av_bsf_receive_packet() repeatedly until it returns AVERROR(EAGAIN) or
* AVERROR_EOF.
*
* @param pkt the packet to filter. The bitstream filter will take ownership of
* the packet and reset the contents of pkt. pkt is not touched if an error occurs.
* This parameter may be NULL, which signals the end of the stream (i.e. no more
* packets will be sent). That will cause the filter to output any packets it
* may have buffered internally.
*
* @return 0 on success, a negative AVERROR on error.
*/
int av_bsf_send_packet(AVBSFContext *ctx, AVPacket *pkt);
/**
* Retrieve a filtered packet.
*
* @param[out] pkt this struct will be filled with the contents of the filtered
* packet. It is owned by the caller and must be freed using
* av_packet_unref() when it is no longer needed.
* This parameter should be "clean" (i.e. freshly allocated
* with av_packet_alloc() or unreffed with av_packet_unref())
* when this function is called. If this function returns
* successfully, the contents of pkt will be completely
* overwritten by the returned data. On failure, pkt is not
* touched.
*
* @return 0 on success. AVERROR(EAGAIN) if more packets need to be sent to the
* filter (using av_bsf_send_packet()) to get more output. AVERROR_EOF if there
* will be no further output from the filter. Another negative AVERROR value if
* an error occurs.
*
* @note one input packet may result in several output packets, so after sending
* a packet with av_bsf_send_packet(), this function needs to be called
* repeatedly until it stops returning 0. It is also possible for a filter to
* output fewer packets than were sent to it, so this function may return
* AVERROR(EAGAIN) immediately after a successful av_bsf_send_packet() call.
*/
int av_bsf_receive_packet(AVBSFContext *ctx, AVPacket *pkt);
/**
* Free a bitstream filter context and everything associated with it; write NULL
* into the supplied pointer.
*/
void av_bsf_free(AVBSFContext **ctx);
/**
* Get the AVClass for AVBSFContext. It can be used in combination with
* AV_OPT_SEARCH_FAKE_OBJ for examining options.
*
* @see av_opt_find().
*/
const AVClass *av_bsf_get_class(void);
/* memory */
/**
* Allocate a buffer with padding, reusing the given one if large enough.
*
* Same behaviour av_fast_malloc but the buffer has additional
* AV_INPUT_PADDING_SIZE at the end which will always memset to 0.
*/
void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size);
/**
* Encode extradata length to a buffer. Used by xiph codecs.
*
* @param s buffer to write to; must be at least (v/255+1) bytes long
* @param v size of extradata in bytes
* @return number of bytes written to the buffer.
*/
unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
#if FF_API_MISSING_SAMPLE
/**
* Log a generic warning message about a missing feature. This function is
* intended to be used internally by Libav (libavcodec, libavformat, etc.)
* only, and would normally not be used by applications.
* @param[in] avc a pointer to an arbitrary struct of which the first field is
* a pointer to an AVClass struct
* @param[in] feature string containing the name of the missing feature
* @param[in] want_sample indicates if samples are wanted which exhibit this feature.
* If want_sample is non-zero, additional verbiage will be added to the log
* message which tells the user how to report samples to the development
* mailing list.
* @deprecated Use avpriv_report_missing_feature() instead.
*/
attribute_deprecated
void av_log_missing_feature(void *avc, const char *feature, int want_sample);
/**
* Log a generic warning message asking for a sample. This function is
* intended to be used internally by Libav (libavcodec, libavformat, etc.)
* only, and would normally not be used by applications.
* @param[in] avc a pointer to an arbitrary struct of which the first field is
* a pointer to an AVClass struct
* @param[in] msg string containing an optional message, or NULL if no message
* @deprecated Use avpriv_request_sample() instead.
*/
attribute_deprecated
void av_log_ask_for_sample(void *avc, const char *msg, ...) av_printf_format(2, 3);
#endif /* FF_API_MISSING_SAMPLE */
/**
* Register the hardware accelerator hwaccel.
*/
void av_register_hwaccel(AVHWAccel *hwaccel);
/**
* If hwaccel is NULL, returns the first registered hardware accelerator,
* if hwaccel is non-NULL, returns the next registered hardware accelerator
* after hwaccel, or NULL if hwaccel is the last one.
*/
AVHWAccel *av_hwaccel_next(const AVHWAccel *hwaccel);
/**
* Lock operation used by lockmgr
*/
enum AVLockOp {
AV_LOCK_CREATE, ///< Create a mutex
AV_LOCK_OBTAIN, ///< Lock the mutex
AV_LOCK_RELEASE, ///< Unlock the mutex
AV_LOCK_DESTROY, ///< Free mutex resources
};
/**
* Register a user provided lock manager supporting the operations
* specified by AVLockOp. The "mutex" argument to the function points
* to a (void *) where the lockmgr should store/get a pointer to a user
* allocated mutex. It is NULL upon AV_LOCK_CREATE and equal to the
* value left by the last call for all other ops. If the lock manager is
* unable to perform the op then it should leave the mutex in the same
* state as when it was called and return a non-zero value. However,
* when called with AV_LOCK_DESTROY the mutex will always be assumed to
* have been successfully destroyed. If av_lockmgr_register succeeds
* it will return a non-negative value, if it fails it will return a
* negative value and destroy all mutex and unregister all callbacks.
* av_lockmgr_register is not thread-safe, it must be called from a
* single thread before any calls which make use of locking are used.
*
* @param cb User defined callback. av_lockmgr_register invokes calls
* to this callback and the previously registered callback.
* The callback will be used to create more than one mutex
* each of which must be backed by its own underlying locking
* mechanism (i.e. do not use a single static object to
* implement your lock manager). If cb is set to NULL the
* lockmgr will be unregistered.
*/
int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
/**
* Get the type of the given codec.
*/
enum AVMediaType avcodec_get_type(enum AVCodecID codec_id);
/**
* @return a positive value if s is open (i.e. avcodec_open2() was called on it
* with no corresponding avcodec_close()), 0 otherwise.
*/
int avcodec_is_open(AVCodecContext *s);
/**
* @return a non-zero number if codec is an encoder, zero otherwise
*/
int av_codec_is_encoder(const AVCodec *codec);
/**
* @return a non-zero number if codec is a decoder, zero otherwise
*/
int av_codec_is_decoder(const AVCodec *codec);
/**
* @return descriptor for given codec ID or NULL if no descriptor exists.
*/
const AVCodecDescriptor *avcodec_descriptor_get(enum AVCodecID id);
/**
* Iterate over all codec descriptors known to libavcodec.
*
* @param prev previous descriptor. NULL to get the first descriptor.
*
* @return next descriptor or NULL after the last descriptor
*/
const AVCodecDescriptor *avcodec_descriptor_next(const AVCodecDescriptor *prev);
/**
* @return codec descriptor with the given name or NULL if no such descriptor
* exists.
*/
const AVCodecDescriptor *avcodec_descriptor_get_by_name(const char *name);
/**
* Allocate a CPB properties structure and initialize its fields to default
* values.
*
* @param size if non-NULL, the size of the allocated struct will be written
* here. This is useful for embedding it in side data.
*
* @return the newly allocated struct or NULL on failure
*/
AVCPBProperties *av_cpb_properties_alloc(size_t *size);
/**
* @}
*/
#endif /* AVCODEC_AVCODEC_H */
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