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ffmpeg/libavformat/avformat.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_H
#define AVFORMAT_H
#ifdef __cplusplus
extern "C" {
#endif
#define LIBAVFORMAT_VERSION_INT ((51<<16)+(12<<8)+1)
#define LIBAVFORMAT_VERSION 51.12.1
#define LIBAVFORMAT_BUILD LIBAVFORMAT_VERSION_INT
#define LIBAVFORMAT_IDENT "Lavf" AV_STRINGIFY(LIBAVFORMAT_VERSION)
#include <time.h>
#include <stdio.h> /* FILE */
#include "avcodec.h"
#include "avio.h"
/* packet functions */
typedef struct AVPacket {
int64_t pts; ///< presentation time stamp in time_base units
int64_t dts; ///< decompression time stamp in time_base units
uint8_t *data;
int size;
int stream_index;
int flags;
int duration; ///< presentation duration in time_base units (0 if not available)
void (*destruct)(struct AVPacket *);
void *priv;
int64_t pos; ///< byte position in stream, -1 if unknown
} AVPacket;
#define PKT_FLAG_KEY 0x0001
void av_destruct_packet_nofree(AVPacket *pkt);
/**
* Default packet destructor.
*/
void av_destruct_packet(AVPacket *pkt);
/* initialize optional fields of a packet */
static inline void av_init_packet(AVPacket *pkt)
{
pkt->pts = AV_NOPTS_VALUE;
pkt->dts = AV_NOPTS_VALUE;
pkt->pos = -1;
pkt->duration = 0;
pkt->flags = 0;
pkt->stream_index = 0;
pkt->destruct= av_destruct_packet_nofree;
}
/**
* Allocate the payload of a packet and intialized its fields to 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);
/**
* Allocate and read the payload of a packet and intialized its fields to default values.
*
* @param pkt packet
* @param size wanted payload size
* @return >0 (read size) if OK. AVERROR_xxx otherwise.
*/
int av_get_packet(ByteIOContext *s, AVPacket *pkt, int size);
/**
* @warning This is a hack - the packet memory allocation stuff is broken. The
* packet is allocated if it was not really allocated
*/
int av_dup_packet(AVPacket *pkt);
/**
* Free a packet
*
* @param pkt packet to free
*/
static inline void av_free_packet(AVPacket *pkt)
{
if (pkt && pkt->destruct) {
pkt->destruct(pkt);
}
}
/*************************************************/
/* fractional numbers for exact pts handling */
/* the exact value of the fractional number is: 'val + num / den'. num
is assumed to be such as 0 <= num < den */
typedef struct AVFrac {
int64_t val, num, den;
} AVFrac attribute_deprecated;
/*************************************************/
/* input/output formats */
struct AVCodecTag;
struct AVFormatContext;
/** this structure contains the data a format has to probe a file */
typedef struct AVProbeData {
const char *filename;
unsigned char *buf;
int buf_size;
} AVProbeData;
#define AVPROBE_SCORE_MAX 100 ///< max score, half of that is used for file extension based detection
#define AVPROBE_PADDING_SIZE 32 ///< extra allocated bytes at the end of the probe buffer
typedef struct AVFormatParameters {
AVRational time_base;
int sample_rate;
int channels;
int width;
int height;
enum PixelFormat pix_fmt;
int channel; /**< used to select dv channel */
#if LIBAVFORMAT_VERSION_INT < (52<<16)
const char *device; /**< video, audio or DV device */
#endif
const char *standard; /**< tv standard, NTSC, PAL, SECAM */
int mpeg2ts_raw:1; /**< force raw MPEG2 transport stream output, if possible */
int mpeg2ts_compute_pcr:1; /**< compute exact PCR for each transport
stream packet (only meaningful if
mpeg2ts_raw is TRUE */
int initial_pause:1; /**< do not begin to play the stream
immediately (RTSP only) */
int prealloced_context:1;
enum CodecID video_codec_id;
enum CodecID audio_codec_id;
} AVFormatParameters;
//! demuxer will use url_fopen, no opened file should be provided by the caller
#define AVFMT_NOFILE 0x0001
#define AVFMT_NEEDNUMBER 0x0002 /**< needs '%d' in filename */
#define AVFMT_SHOW_IDS 0x0008 /**< show format stream IDs numbers */
#define AVFMT_RAWPICTURE 0x0020 /**< format wants AVPicture structure for
raw picture data */
#define AVFMT_GLOBALHEADER 0x0040 /**< format wants global header */
#define AVFMT_NOTIMESTAMPS 0x0080 /**< format doesnt need / has any timestamps */
#define AVFMT_GENERIC_INDEX 0x0100 /**< use generic index building code */
typedef struct AVOutputFormat {
const char *name;
const char *long_name;
const char *mime_type;
const char *extensions; /**< comma separated filename extensions */
/** size of private data so that it can be allocated in the wrapper */
int priv_data_size;
/* output support */
enum CodecID audio_codec; /**< default audio codec */
enum CodecID video_codec; /**< default video codec */
int (*write_header)(struct AVFormatContext *);
int (*write_packet)(struct AVFormatContext *, AVPacket *pkt);
int (*write_trailer)(struct AVFormatContext *);
/** can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_GLOBALHEADER */
int flags;
/** currently only used to set pixel format if not YUV420P */
int (*set_parameters)(struct AVFormatContext *, AVFormatParameters *);
int (*interleave_packet)(struct AVFormatContext *, AVPacket *out, AVPacket *in, int flush);
/**
* list of supported codec_id-codec_tag pairs, ordered by "better choice first"
* the arrays are all CODEC_ID_NONE terminated
*/
const struct AVCodecTag **codec_tag;
/* private fields */
struct AVOutputFormat *next;
} AVOutputFormat;
typedef struct AVInputFormat {
const char *name;
const char *long_name;
/** size of private data so that it can be allocated in the wrapper */
int priv_data_size;
/** tell if a given file has a chance of being parsing by this format */
int (*read_probe)(AVProbeData *);
/** read the format header and initialize the AVFormatContext
structure. Return 0 if OK. 'ap' if non NULL contains
additional paramters. Only used in raw format right
now. 'av_new_stream' should be called to create new streams. */
int (*read_header)(struct AVFormatContext *,
AVFormatParameters *ap);
/** read one packet and put it in 'pkt'. pts and flags are also
set. 'av_new_stream' can be called only if the flag
AVFMTCTX_NOHEADER is used. */
int (*read_packet)(struct AVFormatContext *, AVPacket *pkt);
/** close the stream. The AVFormatContext and AVStreams are not
freed by this function */
int (*read_close)(struct AVFormatContext *);
/**
* seek to a given timestamp relative to the frames in
* stream component stream_index
* @param stream_index must not be -1
* @param flags selects which direction should be preferred if no exact
* match is available
*/
int (*read_seek)(struct AVFormatContext *,
int stream_index, int64_t timestamp, int flags);
/**
* gets the next timestamp in AV_TIME_BASE units.
*/
int64_t (*read_timestamp)(struct AVFormatContext *s, int stream_index,
int64_t *pos, int64_t pos_limit);
/** can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER */
int flags;
/** if extensions are defined, then no probe is done. You should
usually not use extension format guessing because it is not
reliable enough */
const char *extensions;
/** general purpose read only value that the format can use */
int value;
/** start/resume playing - only meaningful if using a network based format
(RTSP) */
int (*read_play)(struct AVFormatContext *);
/** pause playing - only meaningful if using a network based format
(RTSP) */
int (*read_pause)(struct AVFormatContext *);
const struct AVCodecTag **codec_tag;
/* private fields */
struct AVInputFormat *next;
} AVInputFormat;
enum AVStreamParseType {
AVSTREAM_PARSE_NONE,
AVSTREAM_PARSE_FULL, /**< full parsing and repack */
AVSTREAM_PARSE_HEADERS, /**< only parse headers, don't repack */
AVSTREAM_PARSE_TIMESTAMPS, /**< full parsing and interpolation of timestamps for frames not starting on packet boundary */
};
typedef struct AVIndexEntry {
int64_t pos;
int64_t timestamp;
#define AVINDEX_KEYFRAME 0x0001
int flags:2;
int size:30; //yeah trying to keep the size of this small to reduce memory requirements (its 24 vs 32 byte due to possible 8byte align)
int min_distance; /**< min distance between this and the previous keyframe, used to avoid unneeded searching */
} AVIndexEntry;
typedef struct AVStream {
int index; /**< stream index in AVFormatContext */
int id; /**< format specific stream id */
AVCodecContext *codec; /**< codec context */
/**
* real base frame rate of the stream.
* this is the lowest framerate with which all timestamps can be
* represented accurately (its the least common multiple of all
* framerates in the stream), Note, this value is just a guess!
* for example if the timebase is 1/90000 and all frames have either
* approximately 3600 or 1800 timer ticks then r_frame_rate will be 50/1
*/
AVRational r_frame_rate;
void *priv_data;
#if LIBAVFORMAT_VERSION_INT < (52<<16)
/* internal data used in av_find_stream_info() */
int64_t codec_info_duration;
int codec_info_nb_frames;
#endif
/** encoding: PTS generation when outputing stream */
AVFrac pts;
/**
* 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.
*/
AVRational time_base;
int pts_wrap_bits; /**< number of bits in pts (used for wrapping control) */
/* ffmpeg.c private use */
int stream_copy; /**< if set, just copy stream */
enum AVDiscard discard; ///< selects which packets can be discarded at will and dont need to be demuxed
//FIXME move stuff to a flags field?
/** quality, as it has been removed from AVCodecContext and put in AVVideoFrame
* MN:dunno if thats the right place, for it */
float quality;
/** decoding: position of the first frame of the component, in
AV_TIME_BASE fractional seconds. */
int64_t start_time;
/** decoding: duration of the stream, in AV_TIME_BASE fractional
seconds. */
int64_t duration;
char language[4]; /** ISO 639 3-letter language code (empty string if undefined) */
/* av_read_frame() support */
enum AVStreamParseType need_parsing;
struct AVCodecParserContext *parser;
int64_t cur_dts;
int last_IP_duration;
int64_t last_IP_pts;
/* av_seek_frame() support */
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 nb_frames; ///< number of frames in this stream if known or 0
#define MAX_REORDER_DELAY 4
int64_t pts_buffer[MAX_REORDER_DELAY+1];
} AVStream;
#define AVFMTCTX_NOHEADER 0x0001 /**< signal that no header is present
(streams are added dynamically) */
#define MAX_STREAMS 20
/* format I/O context */
typedef struct AVFormatContext {
const AVClass *av_class; /**< set by av_alloc_format_context */
/* can only be iformat or oformat, not both at the same time */
struct AVInputFormat *iformat;
struct AVOutputFormat *oformat;
void *priv_data;
ByteIOContext pb;
unsigned int nb_streams;
AVStream *streams[MAX_STREAMS];
char filename[1024]; /**< input or output filename */
/* stream info */
int64_t timestamp;
char title[512];
char author[512];
char copyright[512];
char comment[512];
char album[512];
int year; /**< ID3 year, 0 if none */
int track; /**< track number, 0 if none */
char genre[32]; /**< ID3 genre */
int ctx_flags; /**< format specific flags, see AVFMTCTX_xx */
/* private data for pts handling (do not modify directly) */
/** This buffer is only needed when packets were already buffered but
not decoded, for example to get the codec parameters in mpeg
streams */
struct AVPacketList *packet_buffer;
/** decoding: position of the first frame of the component, in
AV_TIME_BASE fractional seconds. NEVER set this value directly:
it is deduced from the AVStream values. */
int64_t start_time;
/** decoding: duration of the stream, in AV_TIME_BASE fractional
seconds. NEVER set this value directly: it is deduced from the
AVStream values. */
int64_t duration;
/** decoding: total file size. 0 if unknown */
int64_t file_size;
/** decoding: total stream bitrate in bit/s, 0 if not
available. Never set it directly if the file_size and the
duration are known as ffmpeg can compute it automatically. */
int bit_rate;
/* av_read_frame() support */
AVStream *cur_st;
const uint8_t *cur_ptr;
int cur_len;
AVPacket cur_pkt;
/* av_seek_frame() support */
int64_t data_offset; /** offset of the first packet */
int index_built;
int mux_rate;
int packet_size;
int preload;
int max_delay;
#define AVFMT_NOOUTPUTLOOP -1
#define AVFMT_INFINITEOUTPUTLOOP 0
/** number of times to loop output in formats that support it */
int loop_output;
int flags;
#define AVFMT_FLAG_GENPTS 0x0001 ///< generate pts if missing even if it requires parsing future frames
#define AVFMT_FLAG_IGNIDX 0x0002 ///< ignore index
int loop_input;
/** decoding: size of data to probe; encoding unused */
unsigned int probesize;
/**
* maximum duration in AV_TIME_BASE units over which the input should be analyzed in av_find_stream_info()
*/
int max_analyze_duration;
const uint8_t *key;
int keylen;
} AVFormatContext;
typedef struct AVPacketList {
AVPacket pkt;
struct AVPacketList *next;
} AVPacketList;
extern AVInputFormat *first_iformat;
extern AVOutputFormat *first_oformat;
enum CodecID av_guess_image2_codec(const char *filename);
/* XXX: use automatic init with either ELF sections or C file parser */
/* modules */
#include "rtp.h"
#include "rtsp.h"
/* utils.c */
void av_register_input_format(AVInputFormat *format);
void av_register_output_format(AVOutputFormat *format);
AVOutputFormat *guess_stream_format(const char *short_name,
const char *filename, const char *mime_type);
AVOutputFormat *guess_format(const char *short_name,
const char *filename, const char *mime_type);
/**
* Guesses the codec id based upon muxer and filename.
*/
enum CodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name,
const char *filename, const char *mime_type, enum CodecType type);
/**
* Send a nice hexadecimal dump of a buffer to the specified file stream.
*
* @param f The file stream pointer where the dump should be sent to.
* @param buf buffer
* @param size buffer size
*
* @see av_hex_dump_log, av_pkt_dump, av_pkt_dump_log
*/
void av_hex_dump(FILE *f, uint8_t *buf, int size);
/**
* Send a nice hexadecimal dump of a buffer to the log.
*
* @param avcl A pointer to an arbitrary struct of which the first field is a
* pointer to an AVClass struct.
* @param level The importance level of the message, lower values signifying
* higher importance.
* @param buf buffer
* @param size buffer size
*
* @see av_hex_dump, av_pkt_dump, av_pkt_dump_log
*/
void av_hex_dump_log(void *avcl, int level, uint8_t *buf, int size);
/**
* Send a nice dump of a packet to the specified file stream.
*
* @param f The file stream pointer where the dump should be sent to.
* @param pkt packet to dump
* @param dump_payload true if the payload must be displayed too
*/
void av_pkt_dump(FILE *f, AVPacket *pkt, int dump_payload);
/**
* Send a nice dump of a packet to the log.
*
* @param avcl A pointer to an arbitrary struct of which the first field is a
* pointer to an AVClass struct.
* @param level The importance level of the message, lower values signifying
* higher importance.
* @param pkt packet to dump
* @param dump_payload true if the payload must be displayed too
*/
void av_pkt_dump_log(void *avcl, int level, AVPacket *pkt, int dump_payload);
void av_register_all(void);
/** codec tag <-> codec id */
enum CodecID av_codec_get_id(const struct AVCodecTag **tags, unsigned int tag);
unsigned int av_codec_get_tag(const struct AVCodecTag **tags, enum CodecID id);
/* media file input */
/**
* finds AVInputFormat based on input format's short name.
*/
AVInputFormat *av_find_input_format(const char *short_name);
/**
* Guess file format.
*
* @param is_opened whether the file is already opened, determines whether
* demuxers with or without AVFMT_NOFILE are probed
*/
AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened);
/**
* Allocates all the structures needed to read an input stream.
* This does not open the needed codecs for decoding the stream[s].
*/
int av_open_input_stream(AVFormatContext **ic_ptr,
ByteIOContext *pb, const char *filename,
AVInputFormat *fmt, AVFormatParameters *ap);
/**
* Open a media file as input. The codec are not opened. Only the file
* header (if present) is read.
*
* @param ic_ptr the opened media file handle is put here
* @param filename filename to open.
* @param fmt if non NULL, force the file format to use
* @param buf_size optional buffer size (zero if default is OK)
* @param ap additional parameters needed when opening the file (NULL if default)
* @return 0 if OK. AVERROR_xxx otherwise.
*/
int av_open_input_file(AVFormatContext **ic_ptr, const char *filename,
AVInputFormat *fmt,
int buf_size,
AVFormatParameters *ap);
/** no av_open for output, so applications will need this: */
AVFormatContext *av_alloc_format_context(void);
/**
* Read packets of a media file to get stream information. This
* is useful for file formats with no headers such as MPEG. This
* function also computes the real frame rate in case of mpeg2 repeat
* frame mode.
* The logical file position is not changed by this function;
* examined packets may be buffered for later processing.
*
* @param ic media file handle
* @return >=0 if OK. AVERROR_xxx if error.
* @todo let user decide somehow what information is needed so we dont waste time geting stuff the user doesnt need
*/
int av_find_stream_info(AVFormatContext *ic);
/**
* Read a transport packet from a media file.
*
* This function is absolete and should never be used.
* Use av_read_frame() instead.
*
* @param s media file handle
* @param pkt is filled
* @return 0 if OK. AVERROR_xxx if error.
*/
int av_read_packet(AVFormatContext *s, AVPacket *pkt);
/**
* Return the next frame of a stream.
*
* The returned packet is valid
* until the next av_read_frame() or until av_close_input_file() and
* must be freed with av_free_packet. For video, the packet contains
* exactly one frame. For audio, it contains an integer number of
* frames if each frame has a known fixed size (e.g. PCM or ADPCM
* data). If the audio frames have a variable size (e.g. MPEG audio),
* then it contains one frame.
*
* pkt->pts, pkt->dts and pkt->duration are always set to correct
* values in AVStream.timebase units (and guessed if the format cannot
* provided them). pkt->pts can be AV_NOPTS_VALUE if the video format
* has B frames, so it is better to rely on pkt->dts if you do not
* decompress the payload.
*
* @return 0 if OK, < 0 if error or end of file.
*/
int av_read_frame(AVFormatContext *s, AVPacket *pkt);
/**
* Seek to the key frame at timestamp.
* 'timestamp' in 'stream_index'.
* @param stream_index If stream_index is (-1), a default
* stream is selected, and timestamp is automatically converted
* from AV_TIME_BASE units to the stream specific time_base.
* @param timestamp timestamp in AVStream.time_base units
* or if there is no stream specified then in AV_TIME_BASE units
* @param flags flags which select direction and seeking mode
* @return >= 0 on success
*/
int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp, int flags);
/**
* start playing a network based stream (e.g. RTSP stream) at the
* current position
*/
int av_read_play(AVFormatContext *s);
/**
* Pause a network based stream (e.g. RTSP stream).
*
* Use av_read_play() to resume it.
*/
int av_read_pause(AVFormatContext *s);
/**
* Close a media file (but not its codecs).
*
* @param s media file handle
*/
void av_close_input_file(AVFormatContext *s);
/**
* Add a new stream to a media file.
*
* Can only be called in the read_header() function. If the flag
* AVFMTCTX_NOHEADER is in the format context, then new streams
* can be added in read_packet too.
*
* @param s media file handle
* @param id file format dependent stream id
*/
AVStream *av_new_stream(AVFormatContext *s, int id);
/**
* Set the pts for a given stream.
*
* @param s stream
* @param pts_wrap_bits number of bits effectively used by the pts
* (used for wrap control, 33 is the value for MPEG)
* @param pts_num numerator to convert to seconds (MPEG: 1)
* @param pts_den denominator to convert to seconds (MPEG: 90000)
*/
void av_set_pts_info(AVStream *s, int pts_wrap_bits,
int pts_num, int pts_den);
#define AVSEEK_FLAG_BACKWARD 1 ///< seek backward
#define AVSEEK_FLAG_BYTE 2 ///< seeking based on position in bytes
#define AVSEEK_FLAG_ANY 4 ///< seek to any frame, even non keyframes
int av_find_default_stream_index(AVFormatContext *s);
/**
* Gets the index for a specific timestamp.
* @param flags if AVSEEK_FLAG_BACKWARD then the returned index will correspond to
* the timestamp which is <= the requested one, if backward is 0
* then it will be >=
* if AVSEEK_FLAG_ANY seek to any frame, only keyframes otherwise
* @return < 0 if no such timestamp could be found
*/
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags);
/**
* Add a index entry into a sorted list updateing if it is already there.
*
* @param timestamp timestamp in the timebase of the given stream
*/
int av_add_index_entry(AVStream *st,
int64_t pos, int64_t timestamp, int size, int distance, int flags);
/**
* Does a binary search using av_index_search_timestamp() and AVCodec.read_timestamp().
* this isnt supposed to be called directly by a user application, but by demuxers
* @param target_ts target timestamp in the time base of the given stream
* @param stream_index stream number
*/
int av_seek_frame_binary(AVFormatContext *s, int stream_index, int64_t target_ts, int flags);
/**
* Updates cur_dts of all streams based on given timestamp and AVStream.
*
* Stream ref_st unchanged, others set cur_dts in their native timebase
* only needed for timestamp wrapping or if (dts not set and pts!=dts)
* @param timestamp new dts expressed in time_base of param ref_st
* @param ref_st reference stream giving time_base of param timestamp
*/
void av_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp);
/**
* Does a binary search using read_timestamp().
* this isnt supposed to be called directly by a user application, but by demuxers
* @param target_ts target timestamp in the time base of the given stream
* @param stream_index stream number
*/
int64_t av_gen_search(AVFormatContext *s, int stream_index, int64_t target_ts, int64_t pos_min, int64_t pos_max, int64_t pos_limit, int64_t ts_min, int64_t ts_max, int flags, int64_t *ts_ret, int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ));
/** media file output */
int av_set_parameters(AVFormatContext *s, AVFormatParameters *ap);
/**
* allocate the stream private data and write the stream header to an
* output media file
*
* @param s media file handle
* @return 0 if OK. AVERROR_xxx if error.
*/
int av_write_header(AVFormatContext *s);
/**
* Write a packet to an output media file.
*
* The packet shall contain one audio or video frame.
* The packet must be correctly interleaved according to the container specification,
* if not then av_interleaved_write_frame must be used
*
* @param s media file handle
* @param pkt the packet, which contains the stream_index, buf/buf_size, dts/pts, ...
* @return < 0 if error, = 0 if OK, 1 if end of stream wanted.
*/
int av_write_frame(AVFormatContext *s, AVPacket *pkt);
/**
* Writes a packet to an output media file ensuring correct interleaving.
*
* The packet must contain one audio or video frame.
* If the packets are already correctly interleaved the application should
* call av_write_frame() instead as its slightly faster, its also important
* to keep in mind that completly non interleaved input will need huge amounts
* of memory to interleave with this, so its prefereable to interleave at the
* demuxer level
*
* @param s media file handle
* @param pkt the packet, which contains the stream_index, buf/buf_size, dts/pts, ...
* @return < 0 if error, = 0 if OK, 1 if end of stream wanted.
*/
int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt);
/**
* Interleave a packet per DTS in an output media file.
*
* Packets with pkt->destruct == av_destruct_packet will be freed inside this function,
* so they cannot be used after it, note calling av_free_packet() on them is still safe.
*
* @param s media file handle
* @param out the interleaved packet will be output here
* @param in the input packet
* @param flush 1 if no further packets are available as input and all
* remaining packets should be output
* @return 1 if a packet was output, 0 if no packet could be output,
* < 0 if an error occured
*/
int av_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush);
/**
* @brief Write the stream trailer to an output media file and
* free the file private data.
*
* @param s media file handle
* @return 0 if OK. AVERROR_xxx if error.
*/
int av_write_trailer(AVFormatContext *s);
void dump_format(AVFormatContext *ic,
int index,
const char *url,
int is_output);
/**
* parses width and height out of string str.
*/
int parse_image_size(int *width_ptr, int *height_ptr, const char *str);
/**
* Converts frame rate from string to a fraction.
*/
int parse_frame_rate(int *frame_rate, int *frame_rate_base, const char *arg);
/**
* Converts date string to number of seconds since Jan 1st, 1970.
*
* @code
* Syntax:
* - If not a duration:
* [{YYYY-MM-DD|YYYYMMDD}]{T| }{HH[:MM[:SS[.m...]]][Z]|HH[MM[SS[.m...]]][Z]}
* Time is localtime unless Z is suffixed to the end. In this case GMT
* Return the date in micro seconds since 1970
*
* - If a duration:
* HH[:MM[:SS[.m...]]]
* S+[.m...]
* @endcode
*/
int64_t parse_date(const char *datestr, int duration);
int64_t av_gettime(void);
/* ffm specific for ffserver */
#define FFM_PACKET_SIZE 4096
offset_t ffm_read_write_index(int fd);
void ffm_write_write_index(int fd, offset_t pos);
void ffm_set_write_index(AVFormatContext *s, offset_t pos, offset_t file_size);
/**
* Attempts to find a specific tag in a URL.
*
* syntax: '?tag1=val1&tag2=val2...'. Little URL decoding is done.
* Return 1 if found.
*/
int find_info_tag(char *arg, int arg_size, const char *tag1, const char *info);
/**
* Returns in 'buf' the path with '%d' replaced by number.
* Also handles the '%0nd' format where 'n' is the total number
* of digits and '%%'.
*
* @param buf destination buffer
* @param buf_size destination buffer size
* @param path numbered sequence string
* @number frame number
* @return 0 if OK, -1 if format error.
*/
int av_get_frame_filename(char *buf, int buf_size,
const char *path, int number);
/**
* Check whether filename actually is a numbered sequence generator.
*
* @param filename possible numbered sequence string
* @return 1 if a valid numbered sequence string, 0 otherwise.
*/
int av_filename_number_test(const char *filename);
/* grab specific */
int video_grab_init(void);
int audio_init(void);
/* DV1394 */
int dv1394_init(void);
int dc1394_init(void);
#ifdef HAVE_AV_CONFIG_H
#include "os_support.h"
int strstart(const char *str, const char *val, const char **ptr);
int stristart(const char *str, const char *val, const char **ptr);
void pstrcpy(char *buf, int buf_size, const char *str);
char *pstrcat(char *buf, int buf_size, const char *s);
void __dynarray_add(unsigned long **tab_ptr, int *nb_ptr, unsigned long elem);
#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 */\
__dynarray_add((unsigned long **)_tab, nb_ptr, (unsigned long)_elem);\
} while(0)
#else
#define dynarray_add(tab, nb_ptr, elem)\
do {\
__dynarray_add((unsigned long **)(tab), nb_ptr, (unsigned long)(elem));\
} while(0)
#endif
time_t mktimegm(struct tm *tm);
struct tm *brktimegm(time_t secs, struct tm *tm);
const char *small_strptime(const char *p, const char *fmt,
struct tm *dt);
struct in_addr;
int resolve_host(struct in_addr *sin_addr, const char *hostname);
void url_split(char *proto, int proto_size,
char *authorization, int authorization_size,
char *hostname, int hostname_size,
int *port_ptr,
char *path, int path_size,
const char *url);
int match_ext(const char *filename, const char *extensions);
#endif /* HAVE_AV_CONFIG_H */
#ifdef __cplusplus
}
#endif
#endif /* AVFORMAT_H */
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