X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavformat%2Favformat.h;h=1bf66b15d1b6aab8b057a00a3433b65fdcee3326;hb=fd36cf6bf6524247a8ff6788c028836fe7d9fd20;hp=71ff0fc15b0bf0a9e30b073aab0390ef1ba15ad0;hpb=18c896be3d8e926ef806e7de29c4a168d7763389;p=ffmpeg diff --git a/libavformat/avformat.h b/libavformat/avformat.h index 71ff0fc15b0..1bf66b15d1b 100644 --- a/libavformat/avformat.h +++ b/libavformat/avformat.h @@ -149,8 +149,8 @@ * av_read_frame() on it. Each call, if successful, will return an AVPacket * containing encoded data for one AVStream, identified by * AVPacket.stream_index. This packet may be passed straight into the libavcodec - * decoding functions avcodec_decode_video2(), avcodec_decode_audio4() or - * avcodec_decode_subtitle2() if the caller wishes to decode the data. + * decoding functions avcodec_send_packet() or avcodec_decode_subtitle2() if the + * caller wishes to decode the data. * * AVPacket.pts, AVPacket.dts and AVPacket.duration timing information will be * set if known. They may also be unset (i.e. AV_NOPTS_VALUE for @@ -165,7 +165,7 @@ * until the next av_read_frame() call or closing the file. If the caller * requires a longer lifetime, av_dup_packet() will make an av_malloc()ed copy * of it. - * In both cases, the packet must be freed with av_free_packet() when it is no + * In both cases, the packet must be freed with av_packet_unref() when it is no * longer needed. * * @section lavf_decoding_seek Seeking @@ -191,13 +191,17 @@ * avio_open2() or a custom one. * - Unless the format is of the AVFMT_NOSTREAMS type, at least one stream must * be created with the avformat_new_stream() function. The caller should fill - * the @ref AVStream.codec "stream codec context" information, such as the - * codec @ref AVCodecContext.codec_type "type", @ref AVCodecContext.codec_id + * the @ref AVStream.codecpar "stream codec parameters" information, such as the + * codec @ref AVCodecParameters.codec_type "type", @ref AVCodecParameters.codec_id * "id" and other parameters (e.g. width / height, the pixel or sample format, - * etc.) as known. The @ref AVCodecContext.time_base "codec timebase" should + * etc.) as known. The @ref AVStream.time_base "stream timebase" should * be set to the timebase that the caller desires to use for this stream (note * that the timebase actually used by the muxer can be different, as will be * described later). + * - It is advised to manually initialize only the relevant fields in + * AVCodecParameters, rather than using @ref avcodec_parameters_copy() during + * remuxing: there is no guarantee that the codec context values remain valid + * for both input and output format contexts. * - The caller may fill in additional information, such as @ref * AVFormatContext.metadata "global" or @ref AVStream.metadata "per-stream" * metadata, @ref AVFormatContext.chapters "chapters", @ref @@ -218,8 +222,8 @@ * a single muxing context, they should not be mixed). Do note that the timing * information on the packets sent to the muxer must be in the corresponding * AVStream's timebase. That timebase is set by the muxer (in the - * avformat_write_header() step) and may be different from the timebase the - * caller set on the codec context. + * avformat_write_header() step) and may be different from the timebase + * requested by the caller. * * Once all the data has been written, the caller must call av_write_trailer() * to flush any buffered packets and finalize the output file, then close the IO @@ -247,7 +251,6 @@ * @{ * @} * @} - * */ #include @@ -296,6 +299,11 @@ struct AVFormatContext; * - sorting -- a modified version of a tag that should be used for * sorting will have '-sort' appended. E.g. artist="The Beatles", * artist-sort="Beatles, The". + * - Some protocols and demuxers support metadata updates. After a successful + * call to av_read_packet(), AVFormatContext.event_flags or AVStream.event_flags + * will be updated to indicate if metadata changed. In order to detect metadata + * changes on a stream, you need to loop through all streams in the AVFormatContext + * and check their individual event_flags. * * - Demuxers attempt to export metadata in a generic format, however tags * with no generic equivalents are left as they are stored in the container. @@ -342,6 +350,7 @@ struct AVFormatContext; * Allocate and read the payload of a packet and initialize its * fields with default values. * + * @param s associated IO context * @param pkt packet * @param size desired payload size * @return >0 (read size) if OK, AVERROR_xxx otherwise @@ -357,6 +366,7 @@ int av_get_packet(AVIOContext *s, AVPacket *pkt, int size); * when there is no reasonable way to know (an upper bound of) * the final size. * + * @param s associated IO context * @param pkt packet * @param size amount of data to read * @return >0 (read size) if OK, AVERROR_xxx otherwise, previous data @@ -364,17 +374,6 @@ int av_get_packet(AVIOContext *s, AVPacket *pkt, int size); */ int av_append_packet(AVIOContext *s, AVPacket *pkt, int size); -/*************************************************/ -/* 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 AVFrac { - int64_t val, num, den; -} AVFrac; - /*************************************************/ /* input/output formats */ @@ -387,9 +386,11 @@ typedef struct AVProbeData { const char *filename; unsigned char *buf; /**< Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero. */ int buf_size; /**< Size of buf except extra allocated bytes */ + const char *mime_type; /**< mime_type, when known. */ } AVProbeData; #define AVPROBE_SCORE_EXTENSION 50 ///< score for file extension +#define AVPROBE_SCORE_MIME 75 ///< score for file mime type #define AVPROBE_SCORE_MAX 100 ///< maximum score #define AVPROBE_PADDING_SIZE 32 ///< extra allocated bytes at the end of the probe buffer @@ -398,8 +399,10 @@ typedef struct AVProbeData { #define AVFMT_NOFILE 0x0001 #define AVFMT_NEEDNUMBER 0x0002 /**< Needs '%d' in filename. */ #define AVFMT_SHOW_IDS 0x0008 /**< Show format stream IDs numbers. */ +#if FF_API_LAVF_FMT_RAWPICTURE #define AVFMT_RAWPICTURE 0x0020 /**< Format wants AVPicture structure for - raw picture data. */ + raw picture data. @deprecated Not used anymore */ +#endif #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. */ @@ -439,10 +442,10 @@ typedef struct AVOutputFormat { enum AVCodecID video_codec; /**< default video codec */ enum AVCodecID subtitle_codec; /**< default subtitle codec */ /** - * can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_RAWPICTURE, + * can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, * AVFMT_GLOBALHEADER, AVFMT_NOTIMESTAMPS, AVFMT_VARIABLE_FPS, * AVFMT_NODIMENSIONS, AVFMT_NOSTREAMS, AVFMT_ALLOW_FLUSH, - * AVFMT_TS_NONSTRICT + * AVFMT_TS_NONSTRICT, AVFMT_TS_NEGATIVE */ int flags; @@ -531,6 +534,13 @@ typedef struct AVInputFormat { const AVClass *priv_class; ///< AVClass for the private context + /** + * Comma-separated list of mime types. + * It is used check for matching mime types while probing. + * @see av_probe_input_format2 + */ + const char *mime_type; + /***************************************************************** * No fields below this line are part of the public API. They * may not be used outside of libavformat and can be changed and @@ -559,8 +569,8 @@ typedef struct AVInputFormat { /** * Read the format header and initialize the AVFormatContext - * structure. Return 0 if OK. Only used in raw format right - * now. 'avformat_new_stream' should be called to create new streams. + * structure. Return 0 if OK. 'avformat_new_stream' should be + * called to create new streams. */ int (*read_header)(struct AVFormatContext *); @@ -664,6 +674,8 @@ typedef struct AVIndexEntry { */ #define AV_DISPOSITION_ATTACHED_PIC 0x0400 +typedef struct AVStreamInternal AVStreamInternal; + /** * Stream structure. * New fields can be added to the end with minor version bumps. @@ -679,33 +691,26 @@ typedef struct AVStream { * encoding: set by the user, replaced by libavformat if left unset */ int id; +#if FF_API_LAVF_AVCTX /** - * Codec context associated with this stream. Allocated and freed by - * libavformat. - * - * - decoding: The demuxer exports codec information stored in the headers - * here. - * - encoding: The user sets codec information, the muxer writes it to the - * output. Mandatory fields as specified in AVCodecContext - * documentation must be set even if this AVCodecContext is - * not actually used for encoding. + * @deprecated use the codecpar struct instead */ + attribute_deprecated AVCodecContext *codec; +#endif void *priv_data; - /** - * encoding: pts generation when outputting stream - */ - struct AVFrac pts; - /** * This is the fundamental unit of time (in seconds) in terms * of which frame timestamps are represented. * * decoding: set by libavformat - * encoding: set by libavformat in avformat_write_header. The muxer may use the - * user-provided value of @ref AVCodecContext.time_base "codec->time_base" - * as a hint. + * encoding: May be set by the caller before avformat_write_header() to + * provide a hint to the muxer about the desired timebase. In + * avformat_write_header(), the muxer will overwrite this field + * with the timebase that will actually be used for the timestamps + * written into the file (which may or may not be related to the + * user-provided one, depending on the format). */ AVRational time_base; @@ -741,6 +746,10 @@ typedef struct AVStream { /** * Average framerate + * + * - demuxing: May be set by libavformat when creating the stream or in + * avformat_find_stream_info(). + * - muxing: May be set by the caller before avformat_write_header(). */ AVRational avg_frame_rate; @@ -753,6 +762,47 @@ typedef struct AVStream { */ AVPacket attached_pic; + /** + * An array of side data that applies to the whole stream (i.e. the + * container does not allow it to change between packets). + * + * There may be no overlap between the side data in this array and side data + * in the packets. I.e. a given side data is either exported by the muxer + * (demuxing) / set by the caller (muxing) in this array, then it never + * appears in the packets, or the side data is exported / sent through + * the packets (always in the first packet where the value becomes known or + * changes), then it does not appear in this array. + * + * - demuxing: Set by libavformat when the stream is created. + * - muxing: May be set by the caller before avformat_write_header(). + * + * Freed by libavformat in avformat_free_context(). + */ + AVPacketSideData *side_data; + /** + * The number of elements in the AVStream.side_data array. + */ + int nb_side_data; + + /** + * Flags for the user to detect events happening on the stream. Flags must + * be cleared by the user once the event has been handled. + * A combination of AVSTREAM_EVENT_FLAG_*. + */ + int event_flags; +#define AVSTREAM_EVENT_FLAG_METADATA_UPDATED 0x0001 ///< The call resulted in updated metadata. + + /* + * Codec parameters associated with this stream. Allocated and freed by + * libavformat in avformat_new_stream() and avformat_free_context() + * respectively. + * + * - demuxing: filled by libavformat on stream creation or in + * avformat_find_stream_info() + * - muxing: filled by the caller before avformat_write_header() + */ + AVCodecParameters *codecpar; + /***************************************************************** * All fields below this line are not part of the public API. They * may not be used outside of libavformat and can be changed and @@ -781,11 +831,6 @@ typedef struct AVStream { int pts_wrap_bits; /**< number of bits in pts (used for wrapping control) */ -#if FF_API_REFERENCE_DTS - /* a hack to keep ABI compatibility for avconv, which accesses parser even - * though it should not */ - int64_t do_not_use; -#endif // Timestamp generation support: int64_t first_dts; int64_t cur_dts; @@ -819,6 +864,12 @@ typedef struct AVStream { support seeking natively. */ int nb_index_entries; unsigned int index_entries_allocated_size; + + /** + * An opaque field for libavformat internal usage. + * Must not be accessed in any way by callers. + */ + AVStreamInternal *internal; } AVStream; #define AV_PROGRAM_RUNNING 1 @@ -903,7 +954,11 @@ typedef struct AVFormatContext { AVIOContext *pb; /* stream info */ - int ctx_flags; /**< Format-specific flags, see AVFMTCTX_xx */ + /** + * Flags signalling stream properties. A combination of AVFMTCTX_*. + * Set by libavformat. + */ + int ctx_flags; /** * Number of elements in AVFormatContext.streams. @@ -961,6 +1016,10 @@ typedef struct AVFormatContext { unsigned int packet_size; int max_delay; + /** + * Flags modifying the (de)muxer behaviour. A combination of AVFMT_FLAG_*. + * Set by the user before avformat_open_input() / avformat_write_header(). + */ int flags; #define AVFMT_FLAG_GENPTS 0x0001 ///< Generate missing pts even if it requires parsing future frames. #define AVFMT_FLAG_IGNIDX 0x0002 ///< Ignore index. @@ -972,6 +1031,13 @@ typedef struct AVFormatContext { #define AVFMT_FLAG_CUSTOM_IO 0x0080 ///< The caller has supplied a custom AVIOContext, don't avio_close() it. #define AVFMT_FLAG_DISCARD_CORRUPT 0x0100 ///< Discard frames marked corrupted #define AVFMT_FLAG_FLUSH_PACKETS 0x0200 ///< Flush the AVIOContext every packet. +/** + * When muxing, try to avoid writing any random/volatile data to the output. + * This includes any random IDs, real-time timestamps/dates, muxer version, etc. + * + * This flag is mainly intended for testing. + */ +#define AVFMT_FLAG_BITEXACT 0x0400 /** * Maximum size of the data read from input for determining @@ -1110,60 +1176,94 @@ typedef struct AVFormatContext { */ int64_t max_interleave_delta; - /***************************************************************** - * All fields below this line are not part of the public API. They - * may not be used outside of libavformat and can be changed and - * removed at will. - * New public fields should be added right above. - ***************************************************************** + /** + * Allow non-standard and experimental extension + * @see AVCodecContext.strict_std_compliance + */ + int strict_std_compliance; + + /** + * Flags for the user to detect events happening on the file. Flags must + * be cleared by the user once the event has been handled. + * A combination of AVFMT_EVENT_FLAG_*. */ + int event_flags; +#define AVFMT_EVENT_FLAG_METADATA_UPDATED 0x0001 ///< The call resulted in updated metadata. /** - * This buffer is only needed when packets were already buffered but - * not decoded, for example to get the codec parameters in MPEG - * streams. + * Maximum number of packets to read while waiting for the first timestamp. + * Decoding only. */ - struct AVPacketList *packet_buffer; - struct AVPacketList *packet_buffer_end; + int max_ts_probe; - /* av_seek_frame() support */ - int64_t data_offset; /**< offset of the first packet */ + /** + * Avoid negative timestamps during muxing. + * Any value of the AVFMT_AVOID_NEG_TS_* constants. + * Note, this only works when using av_interleaved_write_frame. + * - muxing: Set by user + * - demuxing: unused + */ + int avoid_negative_ts; +#define AVFMT_AVOID_NEG_TS_AUTO -1 ///< Enabled when required by target format +#define AVFMT_AVOID_NEG_TS_MAKE_NON_NEGATIVE 1 ///< Shift timestamps so they are non negative +#define AVFMT_AVOID_NEG_TS_MAKE_ZERO 2 ///< Shift timestamps so that they start at 0 /** - * 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. + * An opaque field for libavformat internal usage. + * Must not be accessed in any way by callers. */ - struct AVPacketList *raw_packet_buffer; - struct AVPacketList *raw_packet_buffer_end; + AVFormatInternal *internal; + /** - * Packets split by the parser get queued here. + * Arbitrary user data set by the caller. */ - struct AVPacketList *parse_queue; - struct AVPacketList *parse_queue_end; + void *opaque; + /** - * Remaining size available for raw_packet_buffer, in bytes. + * A callback for opening new IO streams. + * + * Whenever a muxer or a demuxer needs to open an IO stream (typically from + * avformat_open_input() for demuxers, but for certain formats can happen at + * other times as well), it will call this callback to obtain an IO context. + * + * @param s the format context + * @param pb on success, the newly opened IO context should be returned here + * @param url the url to open + * @param flags a combination of AVIO_FLAG_* + * @param options a dictionary of additional options, with the same + * semantics as in avio_open2() + * @return 0 on success, a negative AVERROR code on failure + * + * @note Certain muxers and demuxers do nesting, i.e. they open one or more + * additional internal format contexts. Thus the AVFormatContext pointer + * passed to this callback may be different from the one facing the caller. + * It will, however, have the same 'opaque' field. */ -#define RAW_PACKET_BUFFER_SIZE 2500000 - int raw_packet_buffer_remaining_size; + int (*io_open)(struct AVFormatContext *s, AVIOContext **pb, const char *url, + int flags, AVDictionary **options); /** - * Offset to remap timestamps to be non-negative. - * Expressed in timebase units. + * A callback for closing the streams opened with AVFormatContext.io_open(). */ - int64_t offset; + void (*io_close)(struct AVFormatContext *s, AVIOContext *pb); /** - * Timebase for the timestamp offset. + * A comma-separated list of protocol names that will not be used internally + * by libavformat. If this field is a non-empty string, then protocols + * listed here will be forbidden. + * + * This field should be set using AVOptions. */ - AVRational offset_timebase; + char *protocol_blacklist; /** - * An opaque field for libavformat internal usage. - * Must not be accessed in any way by callers. + * A comma-separated list of protocol names that can be used internally by + * libavformat. If this field is a non-empty string, all protocols not + * listed here will be forbidden. + * + * This field should be set using AVOptions. */ - AVFormatInternal *internal; + char *protocol_whitelist; } AVFormatContext; typedef struct AVPacketList { @@ -1230,14 +1330,14 @@ int avformat_network_deinit(void); * if f is non-NULL, returns the next registered input format after f * or NULL if f is the last one. */ -AVInputFormat *av_iformat_next(AVInputFormat *f); +AVInputFormat *av_iformat_next(const AVInputFormat *f); /** * If f is NULL, returns the first registered output format, * if f is non-NULL, returns the next registered output format after f * or NULL if f is the last one. */ -AVOutputFormat *av_oformat_next(AVOutputFormat *f); +AVOutputFormat *av_oformat_next(const AVOutputFormat *f); /** * Allocate an AVFormatContext. @@ -1269,13 +1369,50 @@ const AVClass *avformat_get_class(void); * * When muxing, should be called by the user before avformat_write_header(). * + * @param s media file handle * @param c If non-NULL, the AVCodecContext corresponding to the new stream * will be initialized to use this codec. This is needed for e.g. codec-specific * defaults to be set, so codec should be provided if it is known. * * @return newly created stream or NULL on error. */ -AVStream *avformat_new_stream(AVFormatContext *s, AVCodec *c); +AVStream *avformat_new_stream(AVFormatContext *s, const AVCodec *c); + +/** + * Wrap an existing array as stream side data. + * + * @param st stream + * @param type side information type + * @param data the side data array. It must be allocated with the av_malloc() + * family of functions. The ownership of the data is transferred to + * st. + * @param size side information size + * @return zero on success, a negative AVERROR code on failure. On failure, + * the stream is unchanged and the data remains owned by the caller. + */ +int av_stream_add_side_data(AVStream *st, enum AVPacketSideDataType type, + uint8_t *data, size_t size); + +/** + * Allocate new information from stream. + * + * @param stream stream + * @param type desired side information type + * @param size side information size + * @return pointer to fresh allocated data or NULL otherwise + */ +uint8_t *av_stream_new_side_data(AVStream *stream, + enum AVPacketSideDataType type, int size); +/** + * Get side information from stream. + * + * @param stream stream + * @param type desired side information type + * @param size pointer for side information size to store (optional) + * @return pointer to data if present or NULL otherwise + */ +uint8_t *av_stream_get_side_data(AVStream *stream, + enum AVPacketSideDataType type, int *size); AVProgram *av_new_program(AVFormatContext *s, int id); @@ -1297,6 +1434,7 @@ AVInputFormat *av_find_input_format(const char *short_name); /** * Guess the file format. * + * @param pd data to be probed * @param is_opened Whether the file is already opened; determines whether * demuxers with or without AVFMT_NOFILE are probed. */ @@ -1305,6 +1443,7 @@ AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened); /** * Guess the file format. * + * @param pd data to be probed * @param is_opened Whether the file is already opened; determines whether * demuxers with or without AVFMT_NOFILE are probed. * @param score_max A probe score larger that this is required to accept a @@ -1420,7 +1559,7 @@ int av_find_best_stream(AVFormatContext *ic, * If pkt->buf is NULL, then the packet is valid until the next * av_read_frame() or until avformat_close_input(). Otherwise the packet * is valid indefinitely. In both cases the packet must be freed with - * av_free_packet when it is no longer needed. For video, the packet contains + * av_packet_unref when it is no longer needed. 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. @@ -1438,6 +1577,8 @@ int av_read_frame(AVFormatContext *s, AVPacket *pkt); /** * Seek to the keyframe at timestamp. * 'timestamp' in 'stream_index'. + * + * @param s media file handle * @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. @@ -1464,6 +1605,7 @@ int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp, * If flags contain AVSEEK_FLAG_ANY, then non-keyframes are treated as * keyframes (this may not be supported by all demuxers). * + * @param s media file handle * @param stream_index index of the stream which is used as time base reference * @param min_ts smallest acceptable timestamp * @param ts target timestamp @@ -1535,24 +1677,29 @@ int avformat_write_header(AVFormatContext *s, AVDictionary **options); * function. * * @param s media file handle - * @param pkt @parblock - * The packet containing the data to be written. Note that unlike + * @param pkt The packet containing the data to be written. Note that unlike * av_interleaved_write_frame(), this function does not take * ownership of the packet passed to it (though some muxers may make * an internal reference to the input packet). - * + *
* This parameter can be NULL (at any time, not just at the end), in * order to immediately flush data buffered within the muxer, for * muxers that buffer up data internally before writing it to the * output. - * + *
* Packet's @ref AVPacket.stream_index "stream_index" field must be * set to the index of the corresponding stream in @ref - * AVFormatContext.streams "s->streams". It is very strongly - * recommended that timing information (@ref AVPacket.pts "pts", @ref - * AVPacket.dts "dts", @ref AVPacket.duration "duration") is set to - * correct values. - * @endparblock + * AVFormatContext.streams "s->streams". + *
+ * The timestamps (@ref AVPacket.pts "pts", @ref AVPacket.dts "dts") + * must be set to correct values in the stream's timebase (unless the + * output format is flagged with the AVFMT_NOTIMESTAMPS flag, then + * they can be set to AV_NOPTS_VALUE). + * The dts for subsequent packets passed to this function must be strictly + * increasing when compared in their respective timebases (unless the + * output format is flagged with the AVFMT_TS_NONSTRICT, then they + * merely have to be nondecreasing). @ref AVPacket.duration + * "duration") should also be set if known. * @return < 0 on error, = 0 if OK, 1 if flushed and there is no more data to flush * * @see av_interleaved_write_frame() @@ -1567,29 +1714,38 @@ int av_write_frame(AVFormatContext *s, AVPacket *pkt); * increasing dts. Callers doing their own interleaving should call * av_write_frame() instead of this function. * - * @param s media file handle - * @param pkt @parblock - * The packet containing the data to be written. + * Using this function instead of av_write_frame() can give muxers advance + * knowledge of future packets, improving e.g. the behaviour of the mp4 + * muxer for VFR content in fragmenting mode. * + * @param s media file handle + * @param pkt The packet containing the data to be written. + *
* If the packet is reference-counted, this function will take * ownership of this reference and unreference it later when it sees * fit. * The caller must not access the data through this reference after * this function returns. If the packet is not reference-counted, * libavformat will make a copy. - * + *
* This parameter can be NULL (at any time, not just at the end), to * flush the interleaving queues. - * + *
* Packet's @ref AVPacket.stream_index "stream_index" field must be * set to the index of the corresponding stream in @ref - * AVFormatContext.streams "s->streams". It is very strongly - * recommended that timing information (@ref AVPacket.pts "pts", @ref - * AVPacket.dts "dts", @ref AVPacket.duration "duration") is set to - * correct values. - * @endparblock - * - * @return 0 on success, a negative AVERROR on error. + * AVFormatContext.streams "s->streams". + *
+ * The timestamps (@ref AVPacket.pts "pts", @ref AVPacket.dts "dts") + * must be set to correct values in the stream's timebase (unless the + * output format is flagged with the AVFMT_NOTIMESTAMPS flag, then + * they can be set to AV_NOPTS_VALUE). + * The dts for subsequent packets in one stream must be strictly + * increasing (unless the output format is flagged with the + * AVFMT_TS_NONSTRICT, then they merely have to be nondecreasing). + * @ref AVPacket.duration "duration") should also be set if known. + * + * @return 0 on success, a negative AVERROR on error. Libavformat will always + * take care of freeing the packet, even if this function fails. * * @see av_write_frame(), AVFormatContext.max_interleave_delta */ @@ -1699,6 +1855,7 @@ void av_pkt_dump_log2(void *avcl, int level, AVPacket *pkt, int dump_payload, * * @param tags list of supported codec_id-codec_tag pairs, as stored * in AVInputFormat.codec_tag and AVOutputFormat.codec_tag + * @param tag codec tag to match to a codec ID */ enum AVCodecID av_codec_get_id(const struct AVCodecTag * const *tags, unsigned int tag); @@ -1708,6 +1865,7 @@ enum AVCodecID av_codec_get_id(const struct AVCodecTag * const *tags, unsigned i * * @param tags list of supported codec_id-codec_tag pairs, as stored * in AVInputFormat.codec_tag and AVOutputFormat.codec_tag + * @param id codec ID to match to a codec tag */ unsigned int av_codec_get_tag(const struct AVCodecTag * const *tags, enum AVCodecID id); @@ -1715,6 +1873,9 @@ int av_find_default_stream_index(AVFormatContext *s); /** * Get the index for a specific timestamp. + * + * @param st stream that the timestamp belongs to + * @param timestamp timestamp to retrieve the index for * @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 >= @@ -1760,6 +1921,16 @@ void av_url_split(char *proto, int proto_size, const char *url); +/** + * Print detailed information about the input or output format, such as + * duration, bitrate, streams, container, programs, metadata, side data, + * codec and time base. + * + * @param ic the context to analyze + * @param index the index to print, if you have multiple inputs or outputs + * @param url the URL to print, such as source or destination file + * @param is_output whether the context is input or output + */ void av_dump_format(AVFormatContext *ic, int index, const char *url, @@ -1811,6 +1982,7 @@ int av_sdp_create(AVFormatContext *ac[], int n_files, char *buf, int size); * Return a positive value if the given filename has one of the given * extensions, 0 otherwise. * + * @param filename file name to check against the given extensions * @param extensions a comma-separated list of filename extensions */ int av_match_ext(const char *filename, const char *extensions); @@ -1818,12 +1990,15 @@ int av_match_ext(const char *filename, const char *extensions); /** * Test if the given container can store a codec. * + * @param ofmt container to check for compatibility + * @param codec_id codec to potentially store in container * @param std_compliance standards compliance level, one of FF_COMPLIANCE_* * * @return 1 if codec with ID codec_id can be stored in ofmt, 0 if it cannot. * A negative number if this information is not available. */ -int avformat_query_codec(AVOutputFormat *ofmt, enum AVCodecID codec_id, int std_compliance); +int avformat_query_codec(const AVOutputFormat *ofmt, enum AVCodecID codec_id, + int std_compliance); /** * @defgroup riff_fourcc RIFF FourCCs