* the @ref AVStream.codec "stream codec context" information, such as the
* codec @ref AVCodecContext.codec_type "type", @ref AVCodecContext.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
+ * AVCodecContext, rather than using @ref avcodec_copy_context() 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
* 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
* - 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.
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
#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. */
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
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
/**
* 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 *);
* 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;
*/
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.
+
/*****************************************************************
* 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
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;
*/
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.
- *****************************************************************
- */
-
/**
- * This buffer is only needed when packets were already buffered but
- * not decoded, for example to get the codec parameters in MPEG
- * streams.
+ * Allow non-standard and experimental extension
+ * @see AVCodecContext.strict_std_compliance
*/
- struct AVPacketList *packet_buffer;
- struct AVPacketList *packet_buffer_end;
+ int strict_std_compliance;
- /* av_seek_frame() support */
- int64_t data_offset; /**< offset of the first packet */
-
- /**
- * Raw packets from the demuxer, prior to parsing and decoding.
- * This buffer is used for buffering packets until the codec can
- * be identified, as parsing cannot be done without knowing the
- * codec.
- */
- struct AVPacketList *raw_packet_buffer;
- struct AVPacketList *raw_packet_buffer_end;
- /**
- * Packets split by the parser get queued here.
- */
- struct AVPacketList *parse_queue;
- struct AVPacketList *parse_queue_end;
/**
- * Remaining size available for raw_packet_buffer, in bytes.
+ * 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_*.
*/
-#define RAW_PACKET_BUFFER_SIZE 2500000
- int raw_packet_buffer_remaining_size;
+ int event_flags;
+#define AVFMT_EVENT_FLAG_METADATA_UPDATED 0x0001 ///< The call resulted in updated metadata.
/**
- * Offset to remap timestamps to be non-negative.
- * Expressed in timebase units.
+ * Maximum number of packets to read while waiting for the first timestamp.
+ * Decoding only.
*/
- int64_t offset;
+ int max_ts_probe;
/**
- * Timebase for the timestamp offset.
+ * 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
*/
- AVRational offset_timebase;
+ 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
/**
* An opaque field for libavformat internal usage.
* 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.
*
* @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);
+
+/**
+ * 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);
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 ouput
+ */
void av_dump_format(AVFormatContext *ic,
int index,
const char *url,
* @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
projects / ffmpeg / blobdiff