* into component streams, and the reverse process of muxing - writing supplied
* data in a specified container format. It also has an @ref lavf_io
* "I/O module" which supports a number of protocols for accessing the data (e.g.
- * file, tcp, http and others). Before using lavf, you need to call
- * av_register_all() to register all compiled muxers, demuxers and protocols.
+ * file, tcp, http and others).
* Unless you are absolutely sure you won't use libavformat's network
* capabilities, you should also call avformat_network_init().
*
* A supported input format is described by an AVInputFormat struct, conversely
* an output format is described by AVOutputFormat. You can iterate over all
- * registered input/output formats using the av_iformat_next() /
- * av_oformat_next() functions. The protocols layer is not part of the public
- * API, so you can only get the names of supported protocols with the
- * avio_enum_protocols() function.
+ * input/output formats using the av_demuxer_iterate / av_muxer_iterate() functions.
+ * The protocols layer is not part of the public API, so you can only get the names
+ * of supported protocols with the avio_enum_protocols() function.
*
* Main lavf structure used for both muxing and demuxing is AVFormatContext,
* which exports all information about the file being read or written. As with
* information will be in AVStream.time_base units, i.e. it has to be
* multiplied by the timebase to convert them to seconds.
*
- * If AVPacket.buf is set on the returned packet, then the packet is
- * allocated dynamically and the user may keep it indefinitely.
- * Otherwise, if AVPacket.buf is NULL, the packet data is backed by a
- * static storage somewhere inside the demuxer and the packet is only valid
- * 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_packet_unref() when it is no
+ * A packet returned by av_read_frame() is always reference-counted,
+ * i.e. AVPacket.buf is set and the user may keep it indefinitely.
+ * The packet must be freed with av_packet_unref() when it is no
* longer needed.
*
* @section lavf_decoding_seek Seeking
#else
#define ff_const59 const
#endif
+#if FF_API_NEXT
ff_const59 struct AVOutputFormat *next;
+#endif
/**
* size of private data so that it can be allocated in the wrapper
*/
int (*write_packet)(struct AVFormatContext *, AVPacket *pkt);
int (*write_trailer)(struct AVFormatContext *);
/**
- * Currently only used to set pixel format if not YUV420P.
+ * A format-specific function for interleavement.
+ * If unset, packets will be interleaved by dts.
*/
int (*interleave_packet)(struct AVFormatContext *, AVPacket *out,
AVPacket *in, int flush);
/**
* Can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_SHOW_IDS,
- * AVFMT_GENERIC_INDEX, AVFMT_TS_DISCONT, AVFMT_NOBINSEARCH,
+ * AVFMT_NOTIMESTAMPS, AVFMT_GENERIC_INDEX, AVFMT_TS_DISCONT, AVFMT_NOBINSEARCH,
* AVFMT_NOGENSEARCH, AVFMT_NO_BYTE_SEEK, AVFMT_SEEK_TO_PTS.
*/
int flags;
* New public fields should be added right above.
*****************************************************************
*/
+#if FF_API_NEXT
ff_const59 struct AVInputFormat *next;
+#endif
/**
* Raw demuxers store their codec ID here.
* AVFMTCTX_NOHEADER is used and only in the calling thread (not in a
* background thread).
* @return 0 on success, < 0 on error.
- * When returning an error, pkt must not have been allocated
- * or must be freed before returning
+ * Upon returning an error, pkt must be unreferenced by the caller.
*/
int (*read_packet)(struct AVFormatContext *, AVPacket *pkt);
* -1 -> probing finished
* 0 -> no probing requested
* rest -> perform probing with request_probe being the minimum score to accept.
- * NOT PART OF PUBLIC API
*/
int request_probe;
/**
/**
* Timestamp offset added to timestamps before muxing
- * NOT PART OF PUBLIC API
*/
int64_t mux_ts_offset;
* - decoding: set by user
*/
int skip_estimate_duration_from_pts;
+
+ /**
+ * Maximum number of packets that can be probed
+ * - encoding: unused
+ * - decoding: set by user
+ */
+ int max_probe_packets;
} AVFormatContext;
#if FF_API_FORMAT_GET_SET
*/
enum AVDurationEstimationMethod av_fmt_ctx_get_duration_estimation_method(const AVFormatContext* ctx);
-typedef struct AVPacketList {
- AVPacket pkt;
- struct AVPacketList *next;
-} AVPacketList;
-
-
/**
* @defgroup lavf_core Core functions
* @ingroup libavf
*
* @param stream stream
* @param type desired side information type
- * @param size pointer for side information size to store (optional)
+ * @param size If supplied, *size will be set to the size of the side data
+ * or to zero if the desired side data is not present.
* @return pointer to data if present or NULL otherwise
*/
uint8_t *av_stream_get_side_data(const AVStream *stream,
* omit invalid data between valid frames so as to give the decoder the maximum
* information possible for decoding.
*
- * 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_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.
+ * On success, the returned packet is reference-counted (pkt->buf is set) and
+ * valid indefinitely. The packet must be freed with 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.
*
* pkt->pts, pkt->dts and pkt->duration are always set to correct
* values in AVStream.time_base units (and guessed if the format cannot
* has B-frames, so it is better to rely on pkt->dts if you do not
* decompress the payload.
*
- * @return 0 if OK, < 0 on error or end of file
+ * @return 0 if OK, < 0 on error or end of file. On error, pkt will be blank
+ * (as if it came from av_packet_alloc()).
+ *
+ * @note pkt will be initialized, so it may be uninitialized, but it must not
+ * contain data that needs to be freed.
*/
int av_read_frame(AVFormatContext *s, AVPacket *pkt);
* @return >=0 on success, error code otherwise
*
* @note This is part of the new seek API which is still under construction.
- * Thus do not use this yet. It may change at any time, do not expect
- * ABI compatibility yet!
*/
int avformat_seek_file(AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags);
* Write an uncoded frame to an output media file.
*
* The frame must be correctly interleaved according to the container
- * specification; if not, then av_interleaved_write_frame() must be used.
+ * specification; if not, av_interleaved_write_uncoded_frame() must be used.
*
- * See av_interleaved_write_frame() for details.
+ * See av_interleaved_write_uncoded_frame() for details.
*/
int av_write_uncoded_frame(AVFormatContext *s, int stream_index,
AVFrame *frame);
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