www.pudn.com > ffmpeg-Sdk.rar > avformat.h
/* * 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 FFMPEG_AVFORMAT_H #define FFMPEG_AVFORMAT_H #define LIBAVFORMAT_VERSION_INT ((52<<16)+(7<<8)+0) #define LIBAVFORMAT_VERSION 52.7.0 #define LIBAVFORMAT_BUILD LIBAVFORMAT_VERSION_INT #define LIBAVFORMAT_IDENT "Lavf" AV_STRINGIFY(LIBAVFORMAT_VERSION) #include#include /* 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 to default values. * * @param pkt packet */ void av_init_packet(AVPacket *pkt); /** * Allocate the payload of a packet and initialize 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 initialize 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 * @deprecated Use AVRational instead */ 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 */ 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; #if LIBAVFORMAT_VERSION_INT < (53<<16) enum CodecID video_codec_id; enum CodecID audio_codec_id; #endif } 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 does not need / have 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; enum CodecID subtitle_codec; /**< default subtitle codec */ /* 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 parsed by this format. * The buffer provided is guaranteed to be AVPROBE_PADDING_SIZE bytes * big so you do not have to check for that unless you need more. */ 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 * @return >= 0 on success (but not necessarily the new offset) */ int (*read_seek)(struct AVFormatContext *, int stream_index, int64_t timestamp, int flags); /** * gets the next timestamp in stream[stream_index].time_base units. * @return the timestamp or AV_NOPTS_VALUE if an error occured */ 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 (it is 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; /** * Stream 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(AVStream) must not be used outside libav*. */ 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 frame rate with which all timestamps can be * represented accurately (it is the least common multiple of all * frame rates 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; /* internal data used in av_find_stream_info() */ int64_t first_dts; /** encoding: PTS generation when outputing stream */ struct 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/frame rate 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 do not 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 that is the right place for it */ float quality; /** * Decoding: pts of the first frame of the stream, in stream time base. * Only set this if you are absolutely 100% sure that the value you set * it to really is the pts of the first frame. * This may be undefined (AV_NOPTS_VALUE). * @note The ASF header does NOT contain a correct start_time the ASF * demuxer must NOT set this. */ int64_t start_time; /** * Decoding: duration of the stream, in stream time base. * If a source file does not specify a duration, but does specify * a bitrate, this value will be estimates from bit rate and file size. */ 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]; char *filename; /**< source filename of the stream */ } AVStream; #define AV_PROGRAM_RUNNING 1 /** * 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(AVProgram) must not be used outside libav*. */ typedef struct AVProgram { int id; char *provider_name; ///< Network name for DVB streams char *name; ///< Service name for DVB streams int flags; enum AVDiscard discard; ///< selects which program to discard and which to feed to the caller unsigned int *stream_index; unsigned int nb_stream_indexes; } AVProgram; #define AVFMTCTX_NOHEADER 0x0001 /**< signal that no header is present (streams are added dynamically) */ #define MAX_STREAMS 20 /** * format I/O context. * 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(AVFormatContext) must not be used outside libav*. */ 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 #define AVFMT_FLAG_NONBLOCK 0x0004 ///< do not block when reading packets from input 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; unsigned int nb_programs; AVProgram **programs; /** * Forced video codec_id. * demuxing: set by user */ enum CodecID video_codec_id; /** * Forced audio codec_id. * demuxing: set by user */ enum CodecID audio_codec_id; /** * Forced subtitle codec_id. * demuxing: set by user */ enum CodecID subtitle_codec_id; /** * Maximum amount of memory in bytes to use per stream for the index. * If the needed index exceeds this size entries will be discarded as * needed to maintain a smaller size. This can lead to slower or less * accurate seeking (depends on demuxer). * Demuxers for which a full in memory index is mandatory will ignore * this. * muxing : unused * demuxing: set by user */ unsigned int max_index_size; } AVFormatContext; typedef struct AVPacketList { AVPacket pkt; struct AVPacketList *next; } AVPacketList; #if LIBAVFORMAT_VERSION_INT < (53<<16) extern AVInputFormat *first_iformat; extern AVOutputFormat *first_oformat; #endif AVInputFormat *av_iformat_next(AVInputFormat *f); AVOutputFormat *av_oformat_next(AVOutputFormat *f); enum CodecID av_guess_image2_codec(const char *filename); /* XXX: use automatic init with either ELF sections or C file parser */ /* modules */ /* 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 codecs 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); /** * Allocate an AVFormatContext. * Can be freed with av_free() but do not forget to free everything you * explicitly allocated as well! */ 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 do not waste time getting stuff the user does not need. */ int av_find_stream_info(AVFormatContext *ic); /** * Read a transport packet from a media file. * * This function is obsolete 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); /** * Free a AVFormatContext allocated by av_open_input_stream. * @param s context to free */ void av_close_input_stream(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); AVProgram *av_new_program(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); /** * Ensures the index uses less memory than the maximum specified in * AVFormatContext.max_index_size, by discarding entries if it grows * too large. * This function is not part of the public API and should only be called * by demuxers. */ void ff_reduce_index(AVFormatContext *s, int stream_index); /** * 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 is not 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 is not 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 it is slightly faster. It is also important * to keep in mind that completely non-interleaved input will need huge amounts * of memory to interleave with this, so it is preferable 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. * @deprecated Use av_parse_video_frame_size instead. */ attribute_deprecated int parse_image_size(int *width_ptr, int *height_ptr, const char *str); /** * Converts frame rate from string to a fraction. * @deprecated Use av_parse_video_frame_rate instead. */ attribute_deprecated int parse_frame_rate(int *frame_rate, int *frame_rate_base, const char *arg); /** * Parses \p datestr and returns a corresponding number of microseconds. * @param datestr String representing a date or a duration. * - If a date the syntax is: * @code * [{YYYY-MM-DD|YYYYMMDD}]{T| }{HH[:MM[:SS[.m...]]][Z]|HH[MM[SS[.m...]]][Z]} * @endcode * Time is localtime unless Z is appended, in which case it is * interpreted as UTC. * If the year-month-day part isn't specified it takes the current * year-month-day. * Returns the number of microseconds since 1st of January, 1970 up to * the time of the parsed date or INT64_MIN if \p datestr cannot be * successfully parsed. * - If a duration the syntax is: * @code * [-]HH[:MM[:SS[.m...]]] * [-]S+[.m...] * @endcode * Returns the number of microseconds contained in a time interval * with the specified duration or INT64_MIN if \p datestr cannot be * successfully parsed. * @param duration Flag which tells how to interpret \p datestr, if * not zero \p datestr is interpreted as a duration, otherwise as a * date. */ 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 * @param 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); /** * Generate an SDP for an RTP session. * * @param ac array of AVFormatContexts describing the RTP streams. If the * array is composed by only one context, such context can contain * multiple AVStreams (one AVStream per RTP stream). Otherwise, * all the contexts in the array (an AVCodecContext per RTP stream) * must contain only one AVStream * @param n_files number of AVCodecContexts contained in ac * @param buff buffer where the SDP will be stored (must be allocated by * the caller * @param size the size of the buffer * @return 0 if OK. AVERROR_xxx if error. */ int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size); #ifdef HAVE_AV_CONFIG_H 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 */ #endif /* FFMPEG_AVFORMAT_H */