/*
* This file is part of FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef AVCODEC_CODEC_INTERNAL_H
#define AVCODEC_CODEC_INTERNAL_H
#include <stdint.h>
#include "libavutil/attributes.h"
#include "avcodec.h"
#include "codec.h"
#include "config.h"
/**
* The codec is not known to be init-threadsafe (i.e. it might be unsafe
* to initialize this codec and another codec concurrently, typically because
* the codec calls external APIs that are not known to be thread-safe).
* Therefore calling the codec's init function needs to be guarded with a lock.
*/
#define FF_CODEC_CAP_NOT_INIT_THREADSAFE (1 << 0)
/**
* The codec allows calling the close function for deallocation even if
* the init function returned a failure. Without this capability flag, a
* codec does such cleanup internally when returning failures from the
* init function and does not expect the close function to be called at
* all.
*/
#define FF_CODEC_CAP_INIT_CLEANUP (1 << 1)
/**
* Decoders marked with FF_CODEC_CAP_SETS_PKT_DTS want to set
* AVFrame.pkt_dts manually. If the flag is set, decode.c won't overwrite
* this field. If it's unset, decode.c tries to guess the pkt_dts field
* from the input AVPacket.
*/
#define FF_CODEC_CAP_SETS_PKT_DTS (1 << 2)
/**
* The decoder extracts and fills its parameters even if the frame is
* skipped due to the skip_frame setting.
*/
#define FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM (1 << 3)
/**
* The decoder sets the cropping fields in the output frames manually.
* If this cap is set, the generic code will initialize output frame
* dimensions to coded rather than display values.
*/
#define FF_CODEC_CAP_EXPORTS_CROPPING (1 << 4)
/**
* Codec initializes slice-based threading with a main function
*/
#define FF_CODEC_CAP_SLICE_THREAD_HAS_MF (1 << 5)
/**
* The decoder might make use of the ProgressFrame API.
*/
#define FF_CODEC_CAP_USES_PROGRESSFRAMES (1 << 6)
/**
* Codec handles avctx->thread_count == 0 (auto) internally.
*/
#define FF_CODEC_CAP_AUTO_THREADS (1 << 7)
/**
* Codec handles output frame properties internally instead of letting the
* internal logic derive them from AVCodecInternal.last_pkt_props.
*/
#define FF_CODEC_CAP_SETS_FRAME_PROPS (1 << 8)
/**
* Codec supports embedded ICC profiles (AV_FRAME_DATA_ICC_PROFILE).
*/
#define FF_CODEC_CAP_ICC_PROFILES (1 << 9)
/**
* The encoder has AV_CODEC_CAP_DELAY set, but does not actually have delay - it
* only wants to be flushed at the end to update some context variables (e.g.
* 2pass stats) or produce a trailing packet. Besides that it immediately
* produces exactly one output packet per each input frame, just as no-delay
* encoders do.
*/
#define FF_CODEC_CAP_EOF_FLUSH (1 << 10)
/**
* FFCodec.codec_tags termination value
*/
#define FF_CODEC_TAGS_END -1
typedef struct FFCodecDefault {
const char *key;
const char *value;
} FFCodecDefault;
struct AVCodecContext;
struct AVSubtitle;
struct AVPacket;
enum FFCodecType {
/* The codec is a decoder using the decode callback;
* audio and video codecs only. */
FF_CODEC_CB_TYPE_DECODE,
/* The codec is a decoder using the decode_sub callback;
* subtitle codecs only. */
FF_CODEC_CB_TYPE_DECODE_SUB,
/* The codec is a decoder using the receive_frame callback;
* audio and video codecs only. */
FF_CODEC_CB_TYPE_RECEIVE_FRAME,
/* The codec is an encoder using the encode callback;
* audio and video codecs only. */
FF_CODEC_CB_TYPE_ENCODE,
/* The codec is an encoder using the encode_sub callback;
* subtitle codecs only. */
FF_CODEC_CB_TYPE_ENCODE_SUB,
/* The codec is an encoder using the receive_packet callback;
* audio and video codecs only. */
FF_CODEC_CB_TYPE_RECEIVE_PACKET,
};
typedef struct FFCodec {
/**
* The public AVCodec. See codec.h for it.
*/
AVCodec p;
/**
* Internal codec capabilities FF_CODEC_CAP_*.
*/
unsigned caps_internal:27;
/**
* This field determines the video color ranges supported by an encoder.
* Should be set to a bitmask of AVCOL_RANGE_MPEG and AVCOL_RANGE_JPEG.
*/
unsigned color_ranges:2;
/**
* This field determines the type of the codec (decoder/encoder)
* and also the exact callback cb implemented by the codec.
* cb_type uses enum FFCodecType values.
*/
unsigned cb_type:3;
int priv_data_size;
/**
* @name Frame-level threading support functions
* @{
*/
/**
* 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)(struct AVCodecContext *dst, const struct AVCodecContext *src);
/**
* Copy variables back to the user-facing context
*/
int (*update_thread_context_for_user)(struct AVCodecContext *dst, const struct AVCodecContext *src);
/** @} */
/**
* Private codec-specific defaults.
*/
const FFCodecDefault *defaults;
int (*init)(struct AVCodecContext *);
union {
/**
* Decode to an AVFrame.
* cb is in this state if cb_type is FF_CODEC_CB_TYPE_DECODE.
*
* @param avctx codec context
* @param[out] frame AVFrame for output
* @param[out] got_frame_ptr decoder sets to 0 or 1 to indicate that
* a non-empty frame was returned in frame.
* @param[in] avpkt AVPacket containing the data to be decoded
* @return amount of bytes read from the packet on success,
* negative error code on failure
*/
int (*decode)(struct AVCodecContext *avctx, struct AVFrame *frame,
int *got_frame_ptr, struct AVPacket *avpkt);
/**
* Decode subtitle data to an AVSubtitle.
* cb is in this state if cb_type is FF_CODEC_CB_TYPE_DECODE_SUB.
*
* Apart from that this is like the decode callback.
*/
int (*decode_sub)(struct AVCodecContext *avctx, struct AVSubtitle *sub,
int *got_frame_ptr, const struct AVPacket *avpkt);
/**
* Decode API with decoupled packet/frame dataflow.
* cb is in this state if cb_type is FF_CODEC_CB_TYPE_RECEIVE_FRAME.
*
* This function is called to get one output frame. It should call
* ff_decode_get_packet() to obtain input data.
*/
int (*receive_frame)(struct AVCodecContext *avctx, struct AVFrame *frame);
/**
* Encode data to an AVPacket.
* cb is in this state if cb_type is FF_CODEC_CB_TYPE_ENCODE
*
* @param avctx codec context
* @param[out] avpkt output AVPacket
* @param[in] frame AVFrame containing the input 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 (*encode)(struct AVCodecContext *avctx, struct AVPacket *avpkt,
const struct AVFrame *frame, int *got_packet_ptr);
/**
* Encode subtitles to a raw buffer.
* cb is in this state if cb_type is FF_CODEC_CB_TYPE_ENCODE_SUB.
*/
int (*encode_sub)(struct AVCodecContext *avctx, uint8_t *buf,
int buf_size, const struct AVSubtitle *sub);
/**
* Encode API with decoupled frame/packet dataflow.
* cb is in this state if cb_type is FF_CODEC_CB_TYPE_RECEIVE_PACKET.
*
* This function is called to get one output packet.
* It should call ff_encode_get_frame() to obtain input data.
*/
int (*receive_packet)(struct AVCodecContext *avctx, struct AVPacket *avpkt);
} cb;
int (*close)(struct AVCodecContext *);
/**
* Flush buffers.
* Will be called when seeking
*/
void (*flush)(struct AVCodecContext *);
/**
* Decoding only, a comma-separated list of bitstream filters to apply to
* packets before decoding.
*/
const char *bsfs;
/**
* Array of pointers to hardware configurations supported by the codec,
* or NULL if no hardware supported. The array is terminated by a NULL
* pointer.
*
* The user can only access this field via avcodec_get_hw_config().
*/
const struct AVCodecHWConfigInternal *const *hw_configs;
/**
* List of supported codec_tags, terminated by FF_CODEC_TAGS_END.
*/
const uint32_t *codec_tags;
/**
* Custom callback for avcodec_get_supported_config(). If absent,
* ff_default_get_supported_config() will be used. `out_num_configs` will
* always be set to a valid pointer.
*/
int (*get_supported_config)(const AVCodecContext *avctx,
const AVCodec *codec,
enum AVCodecConfig config,
unsigned flags,
const void **out_configs,
int *out_num_configs);
} FFCodec;
/**
* Default implementation for avcodec_get_supported_config(). Will return the
* relevant fields from AVCodec if present, or NULL otherwise.
*
* For AVCODEC_CONFIG_COLOR_RANGE, the output will depend on the bitmask in
* FFCodec.color_ranges, with a value of 0 returning NULL.
*/
int ff_default_get_supported_config(const AVCodecContext *avctx,
const AVCodec *codec,
enum AVCodecConfig config,
unsigned flags,
const void **out_configs,
int *out_num_configs);
#if CONFIG_SMALL
#define CODEC_LONG_NAME(str) .p.long_name = NULL
#else
#define CODEC_LONG_NAME(str) .p.long_name = str
#endif
#if HAVE_THREADS
#define UPDATE_THREAD_CONTEXT(func) \
.update_thread_context = (func)
#define UPDATE_THREAD_CONTEXT_FOR_USER(func) \
.update_thread_context_for_user = (func)
#else
#define UPDATE_THREAD_CONTEXT(func) \
.update_thread_context = NULL
#define UPDATE_THREAD_CONTEXT_FOR_USER(func) \
.update_thread_context_for_user = NULL
#endif
#define FF_CODEC_DECODE_CB(func) \
.cb_type = FF_CODEC_CB_TYPE_DECODE, \
.cb.decode = (func)
#define FF_CODEC_DECODE_SUB_CB(func) \
.cb_type = FF_CODEC_CB_TYPE_DECODE_SUB, \
.cb.decode_sub = (func)
#define FF_CODEC_RECEIVE_FRAME_CB(func) \
.cb_type = FF_CODEC_CB_TYPE_RECEIVE_FRAME, \
.cb.receive_frame = (func)
#define FF_CODEC_ENCODE_CB(func) \
.cb_type = FF_CODEC_CB_TYPE_ENCODE, \
.cb.encode = (func)
#define FF_CODEC_ENCODE_SUB_CB(func) \
.cb_type = FF_CODEC_CB_TYPE_ENCODE_SUB, \
.cb.encode_sub = (func)
#define FF_CODEC_RECEIVE_PACKET_CB(func) \
.cb_type = FF_CODEC_CB_TYPE_RECEIVE_PACKET, \
.cb.receive_packet = (func)
static av_always_inline const FFCodec *ffcodec(const AVCodec *codec)
{
return (const FFCodec*)codec;
}
#endif /* AVCODEC_CODEC_INTERNAL_H */