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FFmpeg/libavformat/internal.h

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/*
* copyright (c) 2001 Fabrice Bellard
*
* 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 AVFORMAT_INTERNAL_H
#define AVFORMAT_INTERNAL_H
#include <stdint.h>
#include "libavcodec/packet_internal.h"
#include "avformat.h"
#define MAX_URL_SIZE 4096
/** size of probe buffer, for guessing file type from file contents */
#define PROBE_BUF_MIN 2048
#define PROBE_BUF_MAX (1 << 20)
#ifdef DEBUG
# define hex_dump_debug(class, buf, size) av_hex_dump_log(class, AV_LOG_DEBUG, buf, size)
#else
# define hex_dump_debug(class, buf, size) do { if (0) av_hex_dump_log(class, AV_LOG_DEBUG, buf, size); } while(0)
#endif
/**
* For an FFInputFormat with this flag set read_close() needs to be called
* by the caller upon read_header() failure.
*/
#define FF_FMT_INIT_CLEANUP (1 << 0)
typedef struct AVCodecTag {
enum AVCodecID id;
unsigned int tag;
} AVCodecTag;
typedef struct CodecMime{
char str[32];
enum AVCodecID id;
} CodecMime;
/*************************************************/
/* fractional numbers for exact pts handling */
/**
* The exact value of the fractional number is: 'val + num / den'.
* num is assumed to be 0 <= num < den.
*/
typedef struct FFFrac {
int64_t val, num, den;
} FFFrac;
typedef struct FFFormatContext {
/**
* The public context.
*/
AVFormatContext pub;
/**
* Number of streams relevant for interleaving.
* Muxing only.
*/
int nb_interleaved_streams;
avformat/mux: Preserve sync even if later packet has negative ts write_packet() has code to shift the packets timestamps to make them nonnegative or even make them start at ts zero; this code inspects every packet that is written and if a packet with negative timestamp (whether this is dts or pts depends upon another flag; basically: Matroska uses pts, everyone else dts) is encountered, this is offset to make the timestamp zero. All further packets will be offset accordingly (with the offset converted according to the streams' timebases). This is based around an assumption, namely that the timestamps are indeed non-decreasing, so that the first packet with negative timestamps is the first packet with timestamps. This assumption is often fulfilled given that the default interleavement function by default interleaves per dts; yet there are scenarios in which it may not be fulfilled: a) av_write_frame() instead of av_interleaved_write_frame() is used. b) The audio_preload option is used. c) When the timestamps that are made nonnegative/zero are pts (i.e. with Matroska), because the packet with the smallest dts is not necessarily the packet with the smallest pts. d) Possibly with custom interleavement functions. In these cases the relative sync of the first few packet(s) is offset relative to the later packets. This contradicts the documentation ("When shifting is enabled, all output timestamps are shifted by the same amount"). Therefore this commit changes this: As soon as the first packet with valid timestamps is output, it is checked and recorded whether the timestamps need to be shifted. Further packets are no longer checked for needing to be offset; instead they are simply offset. In the cases above this leads to packets with negative timestamps (and the appropriate warnings) instead of desync. This will mostly be fixed in the next commit. This commit also factors handling the avoid_negative_ts stuff out of write_packet() in order to be able to return immediately. Tickets #4536 and #5784 as well as the matroska-avoid-negative-ts-test are examples of c); as has been said, some timestamps are now negative, yet the ref file update does not show it because ffmpeg.c sanitizes the timestamps (-copyts disables it; ffprobe and mkvinfo also show the original timestamps). Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-01-18 20:56:14 +02:00
/**
* Whether the timestamp shift offset has already been determined.
* -1: disabled, 0: not yet determined, 1: determined.
*/
enum {
AVOID_NEGATIVE_TS_DISABLED = -1,
AVOID_NEGATIVE_TS_UNKNOWN = 0,
AVOID_NEGATIVE_TS_KNOWN = 1,
} avoid_negative_ts_status;
#define AVOID_NEGATIVE_TS_ENABLED(status) ((status) >= 0)
/**
* The interleavement function in use. Always set for muxers.
*/
int (*interleave_packet)(struct AVFormatContext *s, AVPacket *pkt,
int flush, int has_packet);
/**
* This buffer is only needed when packets were already buffered but
* not decoded, for example to get the codec parameters in MPEG
* streams.
*/
PacketList packet_buffer;
/* av_seek_frame() support */
int64_t data_offset; /**< offset of the first packet */
/**
* Raw packets from the demuxer, prior to parsing and decoding.
* This buffer is used for buffering packets until the codec can
* be identified, as parsing cannot be done without knowing the
* codec.
*/
PacketList raw_packet_buffer;
/**
* Packets split by the parser get queued here.
*/
PacketList parse_queue;
/**
* The generic code uses this as a temporary packet
* to parse packets or for muxing, especially flushing.
* For demuxers, it may also be used for other means
* for short periods that are guaranteed not to overlap
* with calls to av_read_frame() (or ff_read_packet())
* or with each other.
* It may be used by demuxers as a replacement for
* stack packets (unless they call one of the aforementioned
* functions with their own AVFormatContext).
* Every user has to ensure that this packet is blank
* after using it.
*/
AVPacket *parse_pkt;
/**
* Used to hold temporary packets for the generic demuxing code.
* When muxing, it may be used by muxers to hold packets (even
* permanent ones).
*/
AVPacket *pkt;
/**
* Sum of the size of packets in raw_packet_buffer, in bytes.
*/
int raw_packet_buffer_size;
#if FF_API_COMPUTE_PKT_FIELDS2
int missing_ts_warning;
#endif
#if FF_API_AVSTREAM_SIDE_DATA
int inject_global_side_data;
#endif
int avoid_negative_ts_use_pts;
#if FF_API_LAVF_SHORTEST
/**
* Timestamp of the end of the shortest stream.
*/
int64_t shortest_end;
#endif
/**
* Whether or not avformat_init_output has already been called
*/
int initialized;
/**
* Whether or not avformat_init_output fully initialized streams
*/
int streams_initialized;
/**
* ID3v2 tag useful for MP3 demuxing
*/
AVDictionary *id3v2_meta;
/*
* Prefer the codec framerate for avg_frame_rate computation.
*/
int prefer_codec_framerate;
/**
* Set if chapter ids are strictly monotonic.
*/
int chapter_ids_monotonic;
/**
* Contexts and child contexts do not contain a metadata option
*/
int metafree;
} FFFormatContext;
static av_always_inline FFFormatContext *ffformatcontext(AVFormatContext *s)
{
return (FFFormatContext*)s;
}
typedef struct FFStream {
/**
* The public context.
*/
AVStream pub;
AVFormatContext *fmtctx;
/**
* Set to 1 if the codec allows reordering, so pts can be different
* from dts.
*/
int reorder;
/**
* bitstream filter to run on stream
* - encoding: Set by muxer using ff_stream_add_bitstream_filter
* - decoding: unused
*/
struct AVBSFContext *bsfc;
/**
* Whether or not check_bitstream should still be run on each packet
*/
int bitstream_checked;
lavf: replace AVStream.codec with AVStream.codecpar Currently, AVStream contains an embedded AVCodecContext instance, which is used by demuxers to export stream parameters to the caller and by muxers to receive stream parameters from the caller. It is also used internally as the codec context that is passed to parsers. In addition, it is also widely used by the callers as the decoding (when demuxer) or encoding (when muxing) context, though this has been officially discouraged since Libav 11. There are multiple important problems with this approach: - the fields in AVCodecContext are in general one of * stream parameters * codec options * codec state However, it's not clear which ones are which. It is consequently unclear which fields are a demuxer allowed to set or a muxer allowed to read. This leads to erratic behaviour depending on whether decoding or encoding is being performed or not (and whether it uses the AVStream embedded codec context). - various synchronization issues arising from the fact that the same context is used by several different APIs (muxers/demuxers, parsers, bitstream filters and encoders/decoders) simultaneously, with there being no clear rules for who can modify what and the different processes being typically delayed with respect to each other. - avformat_find_stream_info() making it necessary to support opening and closing a single codec context multiple times, thus complicating the semantics of freeing various allocated objects in the codec context. Those problems are resolved by replacing the AVStream embedded codec context with a newly added AVCodecParameters instance, which stores only the stream parameters exported by the demuxers or read by the muxers.
2014-06-18 21:42:52 +03:00
/**
* The codec context used by avformat_find_stream_info, the parser, etc.
*/
struct AVCodecContext *avctx;
lavf: replace AVStream.codec with AVStream.codecpar Currently, AVStream contains an embedded AVCodecContext instance, which is used by demuxers to export stream parameters to the caller and by muxers to receive stream parameters from the caller. It is also used internally as the codec context that is passed to parsers. In addition, it is also widely used by the callers as the decoding (when demuxer) or encoding (when muxing) context, though this has been officially discouraged since Libav 11. There are multiple important problems with this approach: - the fields in AVCodecContext are in general one of * stream parameters * codec options * codec state However, it's not clear which ones are which. It is consequently unclear which fields are a demuxer allowed to set or a muxer allowed to read. This leads to erratic behaviour depending on whether decoding or encoding is being performed or not (and whether it uses the AVStream embedded codec context). - various synchronization issues arising from the fact that the same context is used by several different APIs (muxers/demuxers, parsers, bitstream filters and encoders/decoders) simultaneously, with there being no clear rules for who can modify what and the different processes being typically delayed with respect to each other. - avformat_find_stream_info() making it necessary to support opening and closing a single codec context multiple times, thus complicating the semantics of freeing various allocated objects in the codec context. Those problems are resolved by replacing the AVStream embedded codec context with a newly added AVCodecParameters instance, which stores only the stream parameters exported by the demuxers or read by the muxers.
2014-06-18 21:42:52 +03:00
/**
* 1 if avctx has been initialized with the values from the codec parameters
*/
int avctx_inited;
/* the context for extracting extradata in find_stream_info()
* inited=1/bsf=NULL signals that extracting is not possible (codec not
* supported) */
struct {
struct AVBSFContext *bsf;
int inited;
} extract_extradata;
/**
* Whether the internal avctx needs to be updated from codecpar (after a late change to codecpar)
*/
int need_context_update;
avformat/mux: Set AV_PKT_FLAG_KEY for is_intra_only packet The patch will make audio and subtitle packets be marked as AV_PKT_FLAG_KEY. For audio, it'll caused the audio sample to be sync sample. To verify ref/fate/movenc results: 1. Get the movenc test data [lmwang@vpn ffmpeg]$ libavformat/tests/movenc -w && mkdir -p audio_old && mv *.mp4 audio_old_ After applied the patch: [lmwang@vpn ffmpeg]$ make fate-movenc SAMPLES=../fate-suite [lmwang@vpn ffmpeg]$ libavformat/tests/movenc -w && mkdir -p audio_key && mv *.mp4 audio_key 2. Get l-smash and build boxdumper https://github.com/l-smash/l-smash.git 3. dump the box of crc change mp4 and diff -u [lmwang@vpn ffmpeg]$ ../l-smash/cli/boxdumper --box audio_key/non-empty-moov-no-elst.mp4 > audio_key/non-empty-moov-no-elst.log [lmwang@vpn ffmpeg]$ ../l-smash/cli/boxdumper --box audio_old/non-empty-moov-no-elst.mp4 > audio_old/non-empty-moov-no-elst.log [lmwang@vpn ffmpeg]$ diff -u audio_key/non-empty-moov-no-elst.log audio_old/non-empty-moov-no-elst.log - default_sample_flags = 0x02000000 - independent - sync sample + default_sample_flags = 0x01010000 + dependent + non-sync sample 4. have checked the change of crc are caused by default_sample_flags non-empty-moov.mp4, non-empty-moov-elst.mp4, non-empty-moov-no-elst.mp4, empty-moov.mp4, delay-moov-content.mp4, empty-moov-second-frag.mp4, empty-moov-second-frag-discont.mp4, delay-moov-second-frag-discont.mp4, delay-moov-elst-second-frag.mp4 etc 5 For subtitle, it'll effect for tests/ref/fate/binsub-movtextenc and tests/ref/fate/sub2video, that's expecting result for the subtitle is marked as keyframe. Below is the checking result of binsub-movtextenc: [lmwang@vpn ffmpeg]$ ./ffmpeg -i ../fate-suite/sub/MovText_capability_tester.mp4 -map 0 -scodec mov_text -f mp4 -flags +bitexact -fflags +bitexact -movflags frag_keyframe+empty_moov audio_key/binsub-movtextenc.mp4 [lmwang@vpn ffmpeg]$ ./ffmpeg -i ../fate-suite/sub/MovText_capability_tester.mp4 -map 0 -scodec mov_text -f mp4 -flags +bitexact -fflags +bitexact -movflags frag_keyframe+empty_moov audio_old/binsub-movtextenc.mp4 [lmwang@vpn ffmpeg]$../l-smash/cli/boxdumper audio_key/binsub-movtextenc.mp4 > audio_key/binsub-movtextenc.log [lmwang@vpn ffmpeg]$../l-smash/cli/boxdumper audio_old/binsub-movtextenc.mp4 > audio_old/binsub-movtextenc.log [lmwang@vpn ffmpeg]$ diff -u audio_key/binsub-movtextenc.log audio_old/binsub-movtextenc.log .... // the key difference is the flag for sync sample - flags = 0x000701 + flags = 0x000301 data-offset-present sample-duration-present sample-size-present - sample-flags-present sample_count = 6 - data_offset = 188 + data_offset = 164 sample[0] sample_duration = 1570000 sample_size = 21 - sample_flags = 0x02000000 - independent - sync sample - degradation_priority = 0 sample[1] sample_duration = 510000 sample_size = 2 - sample_flags = 0x01010000 - dependent - non-sync sample - degradation_priority = 0 sample[2] sample_duration = 1690000 sample_size = 9 - sample_flags = 0x02000000 - independent - sync sample - degradation_priority = 0 Suggested-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com> Suggested-by: Nicolas George <george@nsup.org> Signed-off-by: Limin Wang <lance.lmwang@gmail.com>
2020-04-21 17:35:24 +02:00
int is_intra_only;
FFFrac priv_pts;
/**
* Stream information used internally by avformat_find_stream_info()
*/
struct FFStreamInfo *info;
AVIndexEntry *index_entries; /**< Only used if the format does not
support seeking natively. */
int nb_index_entries;
unsigned int index_entries_allocated_size;
int64_t interleaver_chunk_size;
int64_t interleaver_chunk_duration;
/**
* stream probing state
* -1 -> probing finished
* 0 -> no probing requested
* rest -> perform probing with request_probe being the minimum score to accept.
*/
int request_probe;
/**
* Indicates that everything up to the next keyframe
* should be discarded.
*/
int skip_to_keyframe;
/**
* Number of samples to skip at the start of the frame decoded from the next packet.
*/
int skip_samples;
/**
* If not 0, the number of samples that should be skipped from the start of
* the stream (the samples are removed from packets with pts==0, which also
* assumes negative timestamps do not happen).
* Intended for use with formats such as mp3 with ad-hoc gapless audio
* support.
*/
int64_t start_skip_samples;
/**
* If not 0, the first audio sample that should be discarded from the stream.
* This is broken by design (needs global sample count), but can't be
* avoided for broken by design formats such as mp3 with ad-hoc gapless
* audio support.
*/
int64_t first_discard_sample;
/**
* The sample after last sample that is intended to be discarded after
* first_discard_sample. Works on frame boundaries only. Used to prevent
* early EOF if the gapless info is broken (considered concatenated mp3s).
*/
int64_t last_discard_sample;
/**
* Number of internally decoded frames, used internally in libavformat, do not access
* its lifetime differs from info which is why it is not in that structure.
*/
int nb_decoded_frames;
/**
* Timestamp offset added to timestamps before muxing
*/
int64_t mux_ts_offset;
/**
* This is the lowest ts allowed in this track; it may be set by the muxer
* during init or write_header and influences the automatic timestamp
* shifting code.
*/
int64_t lowest_ts_allowed;
/**
* Internal data to check for wrapping of the time stamp
*/
int64_t pts_wrap_reference;
/**
* Options for behavior, when a wrap is detected.
*
* Defined by AV_PTS_WRAP_ values.
*
* If correction is enabled, there are two possibilities:
* If the first time stamp is near the wrap point, the wrap offset
* will be subtracted, which will create negative time stamps.
* Otherwise the offset will be added.
*/
int pts_wrap_behavior;
/**
* Internal data to prevent doing update_initial_durations() twice
*/
int update_initial_durations_done;
#define MAX_REORDER_DELAY 16
/**
* Internal data to generate dts from pts
*/
int64_t pts_reorder_error[MAX_REORDER_DELAY+1];
uint8_t pts_reorder_error_count[MAX_REORDER_DELAY+1];
int64_t pts_buffer[MAX_REORDER_DELAY+1];
/**
* Internal data to analyze DTS and detect faulty mpeg streams
*/
int64_t last_dts_for_order_check;
uint8_t dts_ordered;
uint8_t dts_misordered;
#if FF_API_AVSTREAM_SIDE_DATA
/**
* Internal data to inject global side data
*/
int inject_global_side_data;
#endif
/**
* display aspect ratio (0 if unknown)
* - encoding: unused
* - decoding: Set by libavformat to calculate sample_aspect_ratio internally
*/
AVRational display_aspect_ratio;
AVProbeData probe_data;
/**
* last packet in packet_buffer for this stream when muxing.
*/
PacketListEntry *last_in_packet_buffer;
int64_t last_IP_pts;
int last_IP_duration;
/**
* Number of packets to buffer for codec probing
*/
int probe_packets;
/* av_read_frame() support */
enum AVStreamParseType need_parsing;
struct AVCodecParserContext *parser;
/**
* Number of frames that have been demuxed during avformat_find_stream_info()
*/
int codec_info_nb_frames;
/**
* Stream Identifier
* This is the MPEG-TS stream identifier +1
* 0 means unknown
*/
int stream_identifier;
// Timestamp generation support:
/**
* Timestamp corresponding to the last dts sync point.
*
* Initialized when AVCodecParserContext.dts_sync_point >= 0 and
* a DTS is received from the underlying container. Otherwise set to
* AV_NOPTS_VALUE by default.
*/
int64_t first_dts;
int64_t cur_dts;
const struct AVCodecDescriptor *codec_desc;
AVRational transferred_mux_tb;
} FFStream;
static av_always_inline FFStream *ffstream(AVStream *st)
{
return (FFStream*)st;
}
static av_always_inline const FFStream *cffstream(const AVStream *st)
{
return (const FFStream*)st;
}
typedef struct FFStreamGroup {
/**
* The public context.
*/
AVStreamGroup pub;
AVFormatContext *fmtctx;
} FFStreamGroup;
static av_always_inline FFStreamGroup *ffstreamgroup(AVStreamGroup *stg)
{
return (FFStreamGroup*)stg;
}
static av_always_inline const FFStreamGroup *cffstreamgroup(const AVStreamGroup *stg)
{
return (const FFStreamGroup*)stg;
}
#ifdef __GNUC__
#define dynarray_add(tab, nb_ptr, elem)\
do {\
__typeof__(tab) _tab = (tab);\
__typeof__(elem) _elem = (elem);\
(void)sizeof(**_tab == _elem); /* check that types are compatible */\
av_dynarray_add(_tab, nb_ptr, _elem);\
} while(0)
#else
#define dynarray_add(tab, nb_ptr, elem)\
do {\
av_dynarray_add((tab), nb_ptr, (elem));\
} while(0)
#endif
void ff_flush_packet_queue(AVFormatContext *s);
/**
* Automatically create sub-directories
*
* @param path will create sub-directories by path
* @return 0, or < 0 on error
*/
int ff_mkdir_p(const char *path);
/**
* Write hexadecimal string corresponding to given binary data. The string
* is zero-terminated.
*
* @param buf the output string is written here;
* needs to be at least 2 * size + 1 bytes long.
* @param src the input data to be transformed.
* @param size the size (in byte) of src.
* @param lowercase determines whether to use the range [0-9a-f] or [0-9A-F].
* @return buf.
*/
char *ff_data_to_hex(char *buf, const uint8_t *src, int size, int lowercase);
/**
* Parse a string of hexadecimal strings. Any space between the hexadecimal
* digits is ignored.
*
* @param data if non-null, the parsed data is written to this pointer
* @param p the string to parse
* @return the number of bytes written (or to be written, if data is null)
*/
int ff_hex_to_data(uint8_t *data, const char *p);
#define NTP_OFFSET 2208988800ULL
#define NTP_OFFSET_US (NTP_OFFSET * 1000000ULL)
/** Get the current time since NTP epoch in microseconds. */
uint64_t ff_ntp_time(void);
/**
* Get the NTP time stamp formatted as per the RFC-5905.
*
* @param ntp_time NTP time in micro seconds (since NTP epoch)
* @return the formatted NTP time stamp
*/
uint64_t ff_get_formatted_ntp_time(uint64_t ntp_time_us);
/**
* Parse the NTP time in micro seconds (since NTP epoch).
*
* @param ntp_ts NTP time stamp formatted as per the RFC-5905.
* @return the time in micro seconds (since NTP epoch)
*/
uint64_t ff_parse_ntp_time(uint64_t ntp_ts);
/**
* Append the media-specific SDP fragment for the media stream c
* to the buffer buff.
*
* Note, the buffer needs to be initialized, since it is appended to
* existing content.
*
* @param buff the buffer to append the SDP fragment to
* @param size the size of the buff buffer
* @param st the AVStream of the media to describe
* @param idx the global stream index
* @param dest_addr the destination address of the media stream, may be NULL
* @param dest_type the destination address type, may be NULL
* @param port the destination port of the media stream, 0 if unknown
* @param ttl the time to live of the stream, 0 if not multicast
* @param fmt the AVFormatContext, which might contain options modifying
* the generated SDP
* @return 0 on success, a negative error code on failure
*/
int ff_sdp_write_media(char *buff, int size, const AVStream *st, int idx,
const char *dest_addr, const char *dest_type,
int port, int ttl, AVFormatContext *fmt);
/**
* Read a whole line of text from AVIOContext. Stop reading after reaching
* either a \\n, a \\0 or EOF. The returned string is always \\0-terminated,
* and may be truncated if the buffer is too small.
*
* @param s the read-only AVIOContext
* @param buf buffer to store the read line
* @param maxlen size of the buffer
* @return the length of the string written in the buffer, not including the
* final \\0
*/
int ff_get_line(AVIOContext *s, char *buf, int maxlen);
/**
* Same as ff_get_line but strip the white-space characters in the text tail
*
* @param s the read-only AVIOContext
* @param buf buffer to store the read line
* @param maxlen size of the buffer
* @return the length of the string written in the buffer
*/
int ff_get_chomp_line(AVIOContext *s, char *buf, int maxlen);
#define SPACE_CHARS " \t\r\n"
/**
* Callback function type for ff_parse_key_value.
*
* @param key a pointer to the key
* @param key_len the number of bytes that belong to the key, including the '='
* char
* @param dest return the destination pointer for the value in *dest, may
* be null to ignore the value
* @param dest_len the length of the *dest buffer
*/
typedef void (*ff_parse_key_val_cb)(void *context, const char *key,
int key_len, char **dest, int *dest_len);
/**
* Parse a string with comma-separated key=value pairs. The value strings
* may be quoted and may contain escaped characters within quoted strings.
*
* @param str the string to parse
* @param callback_get_buf function that returns where to store the
* unescaped value string.
* @param context the opaque context pointer to pass to callback_get_buf
*/
void ff_parse_key_value(const char *str, ff_parse_key_val_cb callback_get_buf,
void *context);
enum AVCodecID ff_guess_image2_codec(const char *filename);
const struct AVCodec *ff_find_decoder(AVFormatContext *s, const AVStream *st,
enum AVCodecID codec_id);
/**
* Set the time base and wrapping info for a given stream. This will be used
* to interpret the stream's timestamps. If the new time base is invalid
* (numerator or denominator are non-positive), it leaves the stream
* unchanged.
*
* @param st stream
* @param pts_wrap_bits number of bits effectively used by the pts
* (used for wrap control)
* @param pts_num time base numerator
* @param pts_den time base denominator
*/
void avpriv_set_pts_info(AVStream *st, int pts_wrap_bits,
unsigned int pts_num, unsigned int pts_den);
/**
* Set the timebase for each stream from the corresponding codec timebase and
* print it.
*/
int ff_framehash_write_header(AVFormatContext *s);
/**
* Frees a stream without modifying the corresponding AVFormatContext.
* Must only be called if the latter doesn't matter or if the stream
* is not yet attached to an AVFormatContext.
*/
void ff_free_stream(AVStream **st);
/**
* Remove a stream from its AVFormatContext and free it.
* The stream must be the last stream of the AVFormatContext.
*/
void ff_remove_stream(AVFormatContext *s, AVStream *st);
/**
* Frees a stream group without modifying the corresponding AVFormatContext.
* Must only be called if the latter doesn't matter or if the stream
* is not yet attached to an AVFormatContext.
*/
void ff_free_stream_group(AVStreamGroup **pstg);
/**
* Remove a stream group from its AVFormatContext and free it.
* The stream group must be the last stream group of the AVFormatContext.
*/
void ff_remove_stream_group(AVFormatContext *s, AVStreamGroup *stg);
unsigned int ff_codec_get_tag(const AVCodecTag *tags, enum AVCodecID id);
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag);
int ff_is_intra_only(enum AVCodecID id);
/**
* Select a PCM codec based on the given parameters.
*
* @param bps bits-per-sample
* @param flt floating-point
* @param be big-endian
* @param sflags signed flags. each bit corresponds to one byte of bit depth.
* e.g. the 1st bit indicates if 8-bit should be signed or
* unsigned, the 2nd bit indicates if 16-bit should be signed or
* unsigned, etc... This is useful for formats such as WAVE where
* only 8-bit is unsigned and all other bit depths are signed.
* @return a PCM codec id or AV_CODEC_ID_NONE
*/
enum AVCodecID ff_get_pcm_codec_id(int bps, int flt, int be, int sflags);
/**
* Copy side data from source to destination stream
*
* @param dst pointer to destination AVStream
* @param src pointer to source AVStream
* @return >=0 on success, AVERROR code on error
*/
int ff_stream_side_data_copy(AVStream *dst, const AVStream *src);
/**
* Create a new stream and copy to it all parameters from a source stream, with
* the exception of the index field, which is set when the new stream is
* created.
*
* @param dst_ctx pointer to the context in which the new stream is created
* @param src pointer to source AVStream
* @return pointer to the new stream or NULL on error
*/
AVStream *ff_stream_clone(AVFormatContext *dst_ctx, const AVStream *src);
/**
* Wrap ffurl_move() and log if error happens.
*
* @param url_src source path
* @param url_dst destination path
* @return 0 or AVERROR on failure
*/
int ff_rename(const char *url_src, const char *url_dst, void *logctx);
/**
Merge commit '059a934806d61f7af9ab3fd9f74994b838ea5eba' * commit '059a934806d61f7af9ab3fd9f74994b838ea5eba': lavc: Consistently prefix input buffer defines Conflicts: doc/examples/decoding_encoding.c libavcodec/4xm.c libavcodec/aac_adtstoasc_bsf.c libavcodec/aacdec.c libavcodec/aacenc.c libavcodec/ac3dec.h libavcodec/asvenc.c libavcodec/avcodec.h libavcodec/avpacket.c libavcodec/dvdec.c libavcodec/ffv1enc.c libavcodec/g2meet.c libavcodec/gif.c libavcodec/h264.c libavcodec/h264_mp4toannexb_bsf.c libavcodec/huffyuvdec.c libavcodec/huffyuvenc.c libavcodec/jpeglsenc.c libavcodec/libxvid.c libavcodec/mdec.c libavcodec/motionpixels.c libavcodec/mpeg4videodec.c libavcodec/mpegvideo.c libavcodec/noise_bsf.c libavcodec/nuv.c libavcodec/nvenc.c libavcodec/options.c libavcodec/parser.c libavcodec/pngenc.c libavcodec/proresenc_kostya.c libavcodec/qsvdec.c libavcodec/svq1enc.c libavcodec/tiffenc.c libavcodec/truemotion2.c libavcodec/utils.c libavcodec/utvideoenc.c libavcodec/vc1dec.c libavcodec/wmalosslessdec.c libavformat/adxdec.c libavformat/aiffdec.c libavformat/apc.c libavformat/apetag.c libavformat/avidec.c libavformat/bink.c libavformat/cafdec.c libavformat/flvdec.c libavformat/id3v2.c libavformat/isom.c libavformat/matroskadec.c libavformat/mov.c libavformat/mpc.c libavformat/mpc8.c libavformat/mpegts.c libavformat/mvi.c libavformat/mxfdec.c libavformat/mxg.c libavformat/nutdec.c libavformat/oggdec.c libavformat/oggparsecelt.c libavformat/oggparseflac.c libavformat/oggparseopus.c libavformat/oggparsespeex.c libavformat/omadec.c libavformat/rawdec.c libavformat/riffdec.c libavformat/rl2.c libavformat/rmdec.c libavformat/rtpdec_latm.c libavformat/rtpdec_mpeg4.c libavformat/rtpdec_qdm2.c libavformat/rtpdec_svq3.c libavformat/sierravmd.c libavformat/smacker.c libavformat/smush.c libavformat/spdifenc.c libavformat/takdec.c libavformat/tta.c libavformat/utils.c libavformat/vqf.c libavformat/westwood_vqa.c libavformat/xmv.c libavformat/xwma.c libavformat/yop.c Merged-by: Michael Niedermayer <michael@niedermayer.cc>
2015-07-27 22:53:16 +02:00
* Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end
* which is always set to 0.
*
* Previously allocated extradata in par will be freed.
*
* @param size size of extradata
* @return 0 if OK, AVERROR_xxx on error
*/
int ff_alloc_extradata(AVCodecParameters *par, int size);
/**
* Copies the whilelists from one context to the other
*/
int ff_copy_whiteblacklists(AVFormatContext *dst, const AVFormatContext *src);
2013-12-31 16:09:48 +03:00
/*
* A wrapper around AVFormatContext.io_close that should be used
* instead of calling the pointer directly.
*
* @param s AVFormatContext
* @param *pb the AVIOContext to be closed and freed. Can be NULL.
* @return >=0 on success, negative AVERROR in case of failure
*/
int ff_format_io_close(AVFormatContext *s, AVIOContext **pb);
/**
* Utility function to check if the file uses http or https protocol
*
* @param s AVFormatContext
* @param filename URL or file name to open for writing
*/
int ff_is_http_proto(const char *filename);
struct AVBPrint;
/**
* Finalize buf into extradata and set its size appropriately.
*/
int ff_bprint_to_codecpar_extradata(AVCodecParameters *par, struct AVBPrint *buf);
int ff_lock_avformat(void);
int ff_unlock_avformat(void);
/**
* Set AVFormatContext url field to the provided pointer. The pointer must
* point to a valid string. The existing url field is freed if necessary. Also
* set the legacy filename field to the same string which was provided in url.
*/
void ff_format_set_url(AVFormatContext *s, char *url);
/**
* Return a positive value if the given url has one of the given
* extensions, negative AVERROR on error, 0 otherwise.
*
* @param url url to check against the given extensions
* @param extensions a comma-separated list of filename extensions
*/
int ff_match_url_ext(const char *url, const char *extensions);
struct FFOutputFormat;
struct FFInputFormat;
void avpriv_register_devices(const struct FFOutputFormat * const o[],
const struct FFInputFormat * const i[]);
#endif /* AVFORMAT_INTERNAL_H */