* set by user for input, always set by user for output (unless you are dealing
* with an AVFMT_NOFILE format).
*
+ * @section lavf_options Passing options to (de)muxers
+ * Lavf allows to configure muxers and demuxers using the @ref avoptions
+ * mechanism. Generic (format-independent) libavformat options are provided by
+ * AVFormatContext, they can be examined from a user program by calling
+ * av_opt_next() / av_opt_find() on an allocated AVFormatContext (or its AVClass
+ * from avformat_get_class()). Private (format-specific) options are provided by
+ * AVFormatContext.priv_data if and only if AVInputFormat.priv_class /
+ * AVOutputFormat.priv_class of the corresponding format struct is non-NULL.
+ * Further options may be provided by the @ref AVFormatContext.pb "I/O context",
+ * if its AVClass is non-NULL, and the protocols layer. See the discussion on
+ * nesting in @ref avoptions documentation to learn how to access those.
+ *
* @defgroup lavf_decoding Demuxing
* @{
* Demuxers read a media file and split it into chunks of data (@em packets). A
- * @ref AVPacket "packet" contains one or more frames which belong a single
- * elementary stream. In lavf API this process is represented by the
+ * @ref AVPacket "packet" contains one or more encoded frames which belongs to a
+ * single elementary stream. In the lavf API this process is represented by the
* avformat_open_input() function for opening a file, av_read_frame() for
* reading a single packet and finally avformat_close_input(), which does the
* cleanup.
* your reading callbacks to it. Then set the @em pb field of your
* AVFormatContext to newly created AVIOContext.
*
+ * Since the format of the opened file is in general not known until after
+ * avformat_open_input() has returned, it is not possible to set demuxer private
+ * options on a preallocated context. Instead, the options should be passed to
+ * avformat_open_input() wrapped in an AVDictionary:
+ * @code
+ * AVDictionary *options = NULL;
+ * av_dict_set(&options, "video_size", "640x480", 0);
+ * av_dict_set(&options, "pixel_format", "rgb24", 0);
+ *
+ * if (avformat_open_input(&s, url, NULL, &options) < 0)
+ * abort();
+ * av_dict_free(&options);
+ * @endcode
+ * This code passes the private options 'video_size' and 'pixel_format' to the
+ * demuxer. They would be necessary for e.g. the rawvideo demuxer, since it
+ * cannot know how to interpret raw video data otherwise. If the format turns
+ * out to be something different than raw video, those options will not be
+ * recognized by the demuxer and therefore will not be applied. Such unrecognized
+ * options are then returned in the options dictionary (recognized options are
+ * consumed). The calling program can handle such unrecognized options as it
+ * wishes, e.g.
+ * @code
+ * AVDictionaryEntry *e;
+ * if (e = av_dict_get(options, "", NULL, AV_DICT_IGNORE_SUFFIX)) {
+ * fprintf(stderr, "Option %s not recognized by the demuxer.\n", e->key);
+ * abort();
+ * }
+ * @endcode
+ *
* After you have finished reading the file, you must close it with
* avformat_close_input(). It will free everything associated with the file.
*
* @section lavf_decoding_read Reading from an opened file
+ * Reading data from an opened AVFormatContext is done by repeatedly calling
+ * 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_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
+ * pts/dts, 0 for duration) if the stream does not provide them. The timing
+ * 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
+ * longer needed.
*
* @section lavf_decoding_seek Seeking
* @}
*
* @defgroup lavf_encoding Muxing
* @{
+ * Muxers take encoded data in the form of @ref AVPacket "AVPackets" and write
+ * it into files or other output bytestreams in the specified container format.
+ *
+ * The main API functions for muxing are avformat_write_header() for writing the
+ * file header, av_write_frame() / av_interleaved_write_frame() for writing the
+ * packets and av_write_trailer() for finalizing the file.
+ *
+ * At the beginning of the muxing process, the caller must first call
+ * avformat_alloc_context() to create a muxing context. The caller then sets up
+ * the muxer by filling the various fields in this context:
+ *
+ * - The @ref AVFormatContext.oformat "oformat" field must be set to select the
+ * muxer that will be used.
+ * - Unless the format is of the AVFMT_NOFILE type, the @ref AVFormatContext.pb
+ * "pb" field must be set to an opened IO context, either returned from
+ * 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.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 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
+ * AVFormatContext.programs "programs", etc. as described in the
+ * AVFormatContext documentation. Whether such information will actually be
+ * stored in the output depends on what the container format and the muxer
+ * support.
+ *
+ * When the muxing context is fully set up, the caller must call
+ * avformat_write_header() to initialize the muxer internals and write the file
+ * header. Whether anything actually is written to the IO context at this step
+ * depends on the muxer, but this function must always be called. Any muxer
+ * private options must be passed in the options parameter to this function.
+ *
+ * The data is then sent to the muxer by repeatedly calling av_write_frame() or
+ * av_interleaved_write_frame() (consult those functions' documentation for
+ * discussion on the difference between them; only one of them may be used with
+ * 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
+ * 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
+ * context (if any) and finally free the muxing context with
+ * avformat_free_context().
* @}
*
* @defgroup lavf_io I/O Read/Write
* @{
* @}
* @}
- *
*/
#include <time.h>
* - 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.
* 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
* 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
*/
int av_append_packet(AVIOContext *s, AVPacket *pkt, int size);
+#if FF_API_LAVF_FRAC
/*************************************************/
/* fractional numbers for exact pts handling */
typedef struct AVFrac {
int64_t val, num, den;
} AVFrac;
+#endif
/*************************************************/
/* input/output formats */
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_MAX 100 ///< maximum score, half of that is used for file-extension-based detection
+#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
/// Demuxer will use avio_open, 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. */
+#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. */
#define AVFMT_VARIABLE_FPS 0x0400 /**< Format allows variable fps. */
#define AVFMT_NODIMENSIONS 0x0800 /**< Format does not need width/height */
#define AVFMT_NOSTREAMS 0x1000 /**< Format does not require any streams */
-#define AVFMT_NOBINSEARCH 0x2000 /**< Format does not allow to fallback to binary search via read_timestamp */
-#define AVFMT_NOGENSEARCH 0x4000 /**< Format does not allow to fallback to generic search */
+#define AVFMT_NOBINSEARCH 0x2000 /**< Format does not allow to fall back on binary search via read_timestamp */
+#define AVFMT_NOGENSEARCH 0x4000 /**< Format does not allow to fall back on generic search */
#define AVFMT_NO_BYTE_SEEK 0x8000 /**< Format does not allow seeking by bytes */
#define AVFMT_ALLOW_FLUSH 0x10000 /**< Format allows flushing. If not set, the muxer will not receive a NULL packet in the write_packet function. */
+#define AVFMT_TS_NONSTRICT 0x20000 /**< Format does not require strictly
+ increasing timestamps, but they must
+ still be monotonic */
+#define AVFMT_TS_NEGATIVE 0x40000 /**< Format allows muxing negative
+ timestamps. If not set the timestamp
+ will be shifted in av_write_frame and
+ av_interleaved_write_frame so they
+ start from 0. */
/**
* @addtogroup lavf_encoding
const char *long_name;
const char *mime_type;
const char *extensions; /**< comma-separated filename extensions */
+ /* output support */
+ enum AVCodecID audio_codec; /**< default audio codec */
+ enum AVCodecID video_codec; /**< default video codec */
+ enum AVCodecID subtitle_codec; /**< default subtitle codec */
+ /**
+ * 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_NEGATIVE
+ */
+ int flags;
+
+ /**
+ * List of supported codec_id-codec_tag pairs, ordered by "better
+ * choice first". The arrays are all terminated by AV_CODEC_ID_NONE.
+ */
+ const struct AVCodecTag * const *codec_tag;
+
+
+ const AVClass *priv_class; ///< AVClass for the private context
+
+ /*****************************************************************
+ * No fields below this line are 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.
+ *****************************************************************
+ */
+ struct AVOutputFormat *next;
/**
* 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 *);
/**
* Write a packet. If AVFMT_ALLOW_FLUSH is set in flags,
*/
int (*write_packet)(struct AVFormatContext *, AVPacket *pkt);
int (*write_trailer)(struct AVFormatContext *);
- /**
- * can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_RAWPICTURE,
- * AVFMT_GLOBALHEADER, AVFMT_NOTIMESTAMPS, AVFMT_VARIABLE_FPS,
- * AVFMT_NODIMENSIONS, AVFMT_NOSTREAMS, AVFMT_ALLOW_FLUSH
- */
- int flags;
/**
* Currently only used to set pixel format if not YUV420P.
*/
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 terminated by CODEC_ID_NONE.
- */
- const struct AVCodecTag * const *codec_tag;
-
- enum CodecID subtitle_codec; /**< default subtitle codec */
-
- const AVClass *priv_class; ///< AVClass for the private context
-
/**
* Test if the given codec can be stored in this container.
*
* @return 1 if the codec is supported, 0 if it is not.
* A negative number if unknown.
*/
- int (*query_codec)(enum CodecID id, int std_compliance);
-
- /* private fields */
- struct AVOutputFormat *next;
+ int (*query_codec)(enum AVCodecID id, int std_compliance);
} AVOutputFormat;
/**
* @}
*/
const char *long_name;
+ /**
+ * Can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_SHOW_IDS,
+ * AVFMT_GENERIC_INDEX, AVFMT_TS_DISCONT, AVFMT_NOBINSEARCH,
+ * AVFMT_NOGENSEARCH, AVFMT_NO_BYTE_SEEK.
+ */
+ 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;
+
+ const struct AVCodecTag * const *codec_tag;
+
+ 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
+ * removed at will.
+ * New public fields should be added right above.
+ *****************************************************************
+ */
+ struct AVInputFormat *next;
+
+ /**
+ * Raw demuxers store their codec ID here.
+ */
+ int raw_codec_id;
+
/**
* Size of private data so that it can be allocated in the wrapper.
*/
/**
* Read the format header and initialize the AVFormatContext
- * structure. Return 0 if OK. 'ap' if non-NULL contains
- * additional parameters. Only used in raw format right
- * now. 'av_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 *);
/**
* Read one packet and put it in 'pkt'. pts and flags are also
- * set. 'av_new_stream' can be called only if the flag
+ * set. 'avformat_new_stream' can be called only if the flag
* AVFMTCTX_NOHEADER is used and only in the calling thread (not in a
* background thread).
* @return 0 on success, < 0 on error.
int64_t (*read_timestamp)(struct AVFormatContext *s, int stream_index,
int64_t *pos, int64_t pos_limit);
- /**
- * Can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_SHOW_IDS,
- * AVFMT_GENERIC_INDEX, AVFMT_TS_DISCONT, AVFMT_NOBINSEARCH,
- * AVFMT_NOGENSEARCH, AVFMT_NO_BYTE_SEEK.
- */
- 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_pause)(struct AVFormatContext *);
- const struct AVCodecTag * const *codec_tag;
-
/**
* Seek to timestamp ts.
* Seeking will be done so that the point from which all active streams
* Active streams are all streams that have AVStream.discard < AVDISCARD_ALL.
*/
int (*read_seek2)(struct AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags);
-
- const AVClass *priv_class; ///< AVClass for the private context
-
- /* private fields */
- struct AVInputFormat *next;
} AVInputFormat;
/**
* @}
#define AV_DISPOSITION_HEARING_IMPAIRED 0x0080 /**< stream for hearing impaired audiences */
#define AV_DISPOSITION_VISUAL_IMPAIRED 0x0100 /**< stream for visual impaired audiences */
#define AV_DISPOSITION_CLEAN_EFFECTS 0x0200 /**< stream without voice */
+/**
+ * The stream is stored in the file as an attached picture/"cover art" (e.g.
+ * APIC frame in ID3v2). The single packet associated with it will be returned
+ * among the first few packets read from the file unless seeking takes place.
+ * It can also be accessed at any time in AVStream.attached_pic.
+ */
+#define AV_DISPOSITION_ATTACHED_PIC 0x0400
+
+typedef struct AVStreamInternal AVStreamInternal;
/**
* Stream structure.
*/
typedef struct AVStream {
int index; /**< stream index in AVFormatContext */
- int id; /**< format-specific stream ID */
- AVCodecContext *codec; /**< codec context */
/**
- * Real base framerate of the stream.
- * This is the lowest framerate with which all timestamps can be
- * represented accurately (it is the least common multiple of all
- * framerates in the stream). Note, this value is just a guess!
- * For example, if the time base is 1/90000 and all frames have either
- * approximately 3600 or 1800 timer ticks, then r_frame_rate will be 50/1.
+ * Format-specific stream ID.
+ * decoding: set by libavformat
+ * encoding: set by the user, replaced by libavformat if left unset
*/
- AVRational r_frame_rate;
- void *priv_data;
-
-#if FF_API_REORDER_PRIVATE
- /* internal data used in av_find_stream_info() */
- int64_t first_dts;
+ int id;
+#if FF_API_LAVF_AVCTX
+ /**
+ * @deprecated use the codecpar struct instead
+ */
+ attribute_deprecated
+ AVCodecContext *codec;
#endif
+ void *priv_data;
+#if FF_API_LAVF_FRAC
/**
- * encoding: pts generation when outputting stream
+ * @deprecated this field is unused
*/
+ attribute_deprecated
struct AVFrac pts;
+#endif
/**
* This is the fundamental unit of time (in seconds) in terms
- * of which frame timestamps are represented. For fixed-fps content,
- * time base should be 1/framerate and timestamp increments should be 1.
+ * of which frame timestamps are represented.
+ *
* decoding: set by libavformat
- * encoding: set by libavformat in av_write_header
+ * 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;
-#if FF_API_REORDER_PRIVATE
- int pts_wrap_bits; /**< number of bits in pts (used for wrapping control) */
-#endif
-#if FF_API_STREAM_COPY
- /* ffmpeg.c private use */
- attribute_deprecated int stream_copy; /**< If set, just copy stream. */
-#endif
- enum AVDiscard discard; ///< Selects which packets can be discarded at will and do not need to be demuxed.
/**
* Decoding: pts of the first frame of the stream, in stream time base.
*/
int64_t duration;
-#if FF_API_REORDER_PRIVATE
- /* 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;
-#endif
-
int64_t nb_frames; ///< number of frames in this stream if known or 0
int disposition; /**< AV_DISPOSITION_* bit field */
-#if FF_API_REORDER_PRIVATE
- AVProbeData probe_data;
-#define MAX_REORDER_DELAY 16
- int64_t pts_buffer[MAX_REORDER_DELAY+1];
-#endif
+ enum AVDiscard discard; ///< Selects which packets can be discarded at will and do not need to be demuxed.
/**
* sample aspect ratio (0 if unknown)
AVDictionary *metadata;
-#if FF_API_REORDER_PRIVATE
- /* Intended mostly for av_read_frame() support. Not supposed to be used by */
- /* external applications; try to use something else if at all possible. */
- const uint8_t *cur_ptr;
- int cur_len;
- AVPacket cur_pkt;
-
- // Timestamp generation support:
/**
- * Timestamp corresponding to the last dts sync point.
+ * Average framerate
*
- * Initialized when AVCodecParserContext.dts_sync_point >= 0 and
- * a DTS is received from the underlying container. Otherwise set to
- * AV_NOPTS_VALUE by default.
+ * - 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().
*/
- int64_t reference_dts;
+ AVRational avg_frame_rate;
/**
- * Number of packets to buffer for codec probing
- * NOT PART OF PUBLIC API
+ * For streams with AV_DISPOSITION_ATTACHED_PIC disposition, this packet
+ * will contain the attached picture.
+ *
+ * decoding: set by libavformat, must not be modified by the caller.
+ * encoding: unused
*/
-#define MAX_PROBE_PACKETS 2500
- int probe_packets;
+ AVPacket attached_pic;
/**
- * last packet in packet_buffer for this stream when muxing.
- * Used internally, NOT PART OF PUBLIC API, do not read or
- * write from outside of libav*
+ * 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().
*/
- struct AVPacketList *last_in_packet_buffer;
-#endif
+ AVPacketSideData *side_data;
+ /**
+ * The number of elements in the AVStream.side_data array.
+ */
+ int nb_side_data;
/**
- * Average framerate
+ * 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_*.
*/
- AVRational avg_frame_rate;
+ 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
*****************************************************************
*/
- /**
- * Number of frames that have been demuxed during av_find_stream_info()
- */
- int codec_info_nb_frames;
-
/**
* Stream information used internally by av_find_stream_info()
*/
#define MAX_STD_TIMEBASES (60*12+5)
struct {
- int64_t last_dts;
- int64_t duration_gcd;
- int duration_count;
- double duration_error[MAX_STD_TIMEBASES];
- int64_t codec_info_duration;
int nb_decoded_frames;
+ int found_decoder;
+
+ /**
+ * Those are used for average framerate estimation.
+ */
+ int64_t fps_first_dts;
+ int fps_first_dts_idx;
+ int64_t fps_last_dts;
+ int fps_last_dts_idx;
+
} *info;
-#if !FF_API_REORDER_PRIVATE
- const uint8_t *cur_ptr;
- int cur_len;
- AVPacket cur_pkt;
+
+ int pts_wrap_bits; /**< number of bits in pts (used for wrapping control) */
// Timestamp generation support:
- /**
- * Timestamp corresponding to the last dts sync point.
- *
- * Initialized when AVCodecParserContext.dts_sync_point >= 0 and
- * a DTS is received from the underlying container. Otherwise set to
- * AV_NOPTS_VALUE by default.
- */
- int64_t reference_dts;
int64_t first_dts;
int64_t cur_dts;
- int last_IP_duration;
int64_t last_IP_pts;
+ int last_IP_duration;
/**
* Number of packets to buffer for codec probing
#define MAX_PROBE_PACKETS 2500
int probe_packets;
+ /**
+ * Number of frames that have been demuxed during av_find_stream_info()
+ */
+ int codec_info_nb_frames;
+
+ /* av_read_frame() support */
+ enum AVStreamParseType need_parsing;
+ struct AVCodecParserContext *parser;
+
/**
* last packet in packet_buffer for this stream when muxing.
*/
AVProbeData probe_data;
#define MAX_REORDER_DELAY 16
int64_t pts_buffer[MAX_REORDER_DELAY+1];
- /* av_read_frame() support */
- enum AVStreamParseType need_parsing;
- struct AVCodecParserContext *parser;
AVIndexEntry *index_entries; /**< Only used if the format does not
support seeking natively. */
int nb_index_entries;
unsigned int index_entries_allocated_size;
- int pts_wrap_bits; /**< number of bits in pts (used for wrapping control) */
-#endif
+ /**
+ * An opaque field for libavformat internal usage.
+ * Must not be accessed in any way by callers.
+ */
+ AVStreamInternal *internal;
} AVStream;
#define AV_PROGRAM_RUNNING 1
AVDictionary *metadata;
} AVChapter;
+typedef struct AVFormatInternal AVFormatInternal;
+
/**
* Format I/O context.
* New fields can be added to the end with minor version bumps.
*/
typedef struct AVFormatContext {
/**
- * A class for logging and AVOptions. Set by avformat_alloc_context().
+ * A class for logging and @ref avoptions. Set by avformat_alloc_context().
* Exports (de)muxer private options if they exist.
*/
const AVClass *av_class;
/**
- * Can only be iformat or oformat, not both at the same time.
+ * The input container format.
*
- * decoding: set by avformat_open_input().
- * encoding: set by the user.
+ * Demuxing only, set by avformat_open_input().
*/
struct AVInputFormat *iformat;
+
+ /**
+ * The output container format.
+ *
+ * Muxing only, must be set by the caller before avformat_write_header().
+ */
struct AVOutputFormat *oformat;
/**
* Format private data. This is an AVOptions-enabled struct
* if and only if iformat/oformat.priv_class is not NULL.
+ *
+ * - muxing: set by avformat_write_header()
+ * - demuxing: set by avformat_open_input()
*/
void *priv_data;
- /*
+ /**
* I/O context.
*
- * decoding: either set by the user before avformat_open_input() (then
- * the user must close it manually) or set by avformat_open_input().
- * encoding: set by the user.
+ * - demuxing: either set by the user before avformat_open_input() (then
+ * the user must close it manually) or set by avformat_open_input().
+ * - muxing: set by the user before avformat_write_header(). The caller must
+ * take care of closing / freeing the IO context.
*
* Do NOT set this field if AVFMT_NOFILE flag is set in
* iformat/oformat.flags. In such a case, the (de)muxer will handle
*/
AVIOContext *pb;
+ /* stream info */
+ /**
+ * Flags signalling stream properties. A combination of AVFMTCTX_*.
+ * Set by libavformat.
+ */
+ int ctx_flags;
+
+ /**
+ * Number of elements in AVFormatContext.streams.
+ *
+ * Set by avformat_new_stream(), must not be modified by any other code.
+ */
+ unsigned int nb_streams;
/**
* A list of all streams in the file. New streams are created with
* avformat_new_stream().
*
- * decoding: streams are created by libavformat in avformat_open_input().
- * If AVFMTCTX_NOHEADER is set in ctx_flags, then new streams may also
- * appear in av_read_frame().
- * encoding: streams are created by the user before avformat_write_header().
+ * - demuxing: streams are created by libavformat in avformat_open_input().
+ * If AVFMTCTX_NOHEADER is set in ctx_flags, then new streams may also
+ * appear in av_read_frame().
+ * - muxing: streams are created by the user before avformat_write_header().
+ *
+ * Freed by libavformat in avformat_free_context().
*/
- unsigned int nb_streams;
AVStream **streams;
- char filename[1024]; /**< input or output filename */
- /* stream info */
- int ctx_flags; /**< Format-specific flags, see AVFMTCTX_xx */
-#if FF_API_REORDER_PRIVATE
- /* 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.
+ * input or output filename
+ *
+ * - demuxing: set by avformat_open_input()
+ * - muxing: may be set by the caller before avformat_write_header()
*/
- struct AVPacketList *packet_buffer;
-#endif
+ char filename[1024];
/**
- * Decoding: position of the first frame of the component, in
+ * 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.
+ *
+ * Demuxing only, set by libavformat.
*/
int64_t start_time;
/**
- * Decoding: duration of the stream, in AV_TIME_BASE fractional
+ * Duration of the stream, in AV_TIME_BASE fractional
* seconds. Only set this value if you know none of the individual stream
* durations and also do not set any of them. This is deduced from the
* AVStream values if not set.
+ *
+ * Demuxing only, set by libavformat.
*/
int64_t duration;
/**
- * Decoding: total stream bitrate in bit/s, 0 if not
+ * Total stream bitrate in bit/s, 0 if not
* available. Never set it directly if the file_size and the
* duration are known as Libav can compute it automatically.
*/
int bit_rate;
-#if FF_API_REORDER_PRIVATE
- /* av_read_frame() support */
- AVStream *cur_st;
-
- /* av_seek_frame() support */
- int64_t data_offset; /**< offset of the first packet */
-#endif
-
unsigned int packet_size;
-#if FF_API_PRELOAD
- attribute_deprecated int preload;
-#endif
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.
#define AVFMT_FLAG_IGNDTS 0x0008 ///< Ignore DTS on frames that contain both DTS & PTS
#define AVFMT_FLAG_NOFILLIN 0x0010 ///< Do not infer any values from other values, just return what is stored in the container
#define AVFMT_FLAG_NOPARSE 0x0020 ///< Do not use AVParsers, you also must set AVFMT_FLAG_NOFILLIN as the fillin code works on frames and no parsing -> no frames. Also seeking to frames can not work if parsing to find frame boundaries has been disabled
+#define AVFMT_FLAG_NOBUFFER 0x0040 ///< Do not buffer frames when possible
#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
/**
- * decoding: size of data to probe; encoding: unused.
+ * Maximum size of the data read from input for determining
+ * the input container format.
+ * Demuxing only, set by the caller before avformat_open_input().
*/
unsigned int probesize;
/**
- * decoding: maximum time (in AV_TIME_BASE units) during which the input should
- * be analyzed in avformat_find_stream_info().
+ * Maximum duration (in AV_TIME_BASE units) of the data read
+ * from input in avformat_find_stream_info().
+ * Demuxing only, set by the caller before avformat_find_stream_info().
*/
int max_analyze_duration;
* Forced video codec_id.
* Demuxing: Set by user.
*/
- enum CodecID video_codec_id;
+ enum AVCodecID video_codec_id;
/**
* Forced audio codec_id.
* Demuxing: Set by user.
*/
- enum CodecID audio_codec_id;
+ enum AVCodecID audio_codec_id;
/**
* Forced subtitle codec_id.
* Demuxing: Set by user.
*/
- enum CodecID subtitle_codec_id;
+ enum AVCodecID subtitle_codec_id;
/**
* Maximum amount of memory in bytes to use for the index of each stream.
* accurate seeking (depends on demuxer).
* Demuxers for which a full in-memory index is mandatory will ignore
* this.
- * muxing : unused
- * demuxing: set by user
+ * - muxing: unused
+ * - demuxing: set by user
*/
unsigned int max_index_size;
*/
unsigned int max_picture_buffer;
- unsigned int nb_chapters;
- AVChapter **chapters;
-
/**
- * Flags to enable debugging.
+ * Number of chapters in AVChapter array.
+ * When muxing, chapters are normally written in the file header,
+ * so nb_chapters should normally be initialized before write_header
+ * is called. Some muxers (e.g. mov and mkv) can also write chapters
+ * in the trailer. To write chapters in the trailer, nb_chapters
+ * must be zero when write_header is called and non-zero when
+ * write_trailer is called.
+ * - muxing: set by user
+ * - demuxing: set by libavformat
*/
- int debug;
-#define FF_FDEBUG_TS 0x0001
+ unsigned int nb_chapters;
+ AVChapter **chapters;
-#if FF_API_REORDER_PRIVATE
/**
- * 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.
+ * Metadata that applies to the whole file.
+ *
+ * - demuxing: set by libavformat in avformat_open_input()
+ * - muxing: may be set by the caller before avformat_write_header()
+ *
+ * Freed by libavformat in avformat_free_context().
*/
- struct AVPacketList *raw_packet_buffer;
- struct AVPacketList *raw_packet_buffer_end;
-
- struct AVPacketList *packet_buffer_end;
-#endif
-
AVDictionary *metadata;
-#if FF_API_REORDER_PRIVATE
- /**
- * Remaining size available for raw_packet_buffer, in bytes.
- * NOT PART OF PUBLIC API
- */
-#define RAW_PACKET_BUFFER_SIZE 2500000
- int raw_packet_buffer_remaining_size;
-#endif
-
/**
* Start time of the stream in real world time, in microseconds
- * since the unix epoch (00:00 1st January 1970). That is, pts=0
- * in the stream was captured at this real world time.
- * - encoding: Set by user.
- * - decoding: Unused.
+ * since the Unix epoch (00:00 1st January 1970). That is, pts=0 in the
+ * stream was captured at this real world time.
+ * Muxing only, set by the caller before avformat_write_header().
*/
int64_t start_time_realtime;
/**
- * decoding: number of frames used to probe fps
+ * The number of frames used for determining the framerate in
+ * avformat_find_stream_info().
+ * Demuxing only, set by the caller before avformat_find_stream_info().
*/
int fps_probe_size;
/**
* Error recognition; higher values will detect more errors but may
* misdetect some more or less valid parts as errors.
- * - encoding: unused
- * - decoding: Set by user.
+ * Demuxing only, set by the caller before avformat_open_input().
*/
int error_recognition;
/**
* Custom interrupt callbacks for the I/O layer.
*
- * decoding: set by the user before avformat_open_input().
- * encoding: set by the user before avformat_write_header()
+ * demuxing: set by the user before avformat_open_input().
+ * muxing: set by the user before avformat_write_header()
* (mainly useful for AVFMT_NOFILE formats). The callback
* should also be passed to avio_open2() if it's used to
* open the file.
*/
AVIOInterruptCB interrupt_callback;
- /*****************************************************************
- * 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.
- *****************************************************************
+ /**
+ * Flags to enable debugging.
*/
-#if !FF_API_REORDER_PRIVATE
+ int debug;
+#define FF_FDEBUG_TS 0x0001
+
/**
- * 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.
+ * Maximum buffering duration for interleaving.
+ *
+ * To ensure all the streams are interleaved correctly,
+ * av_interleaved_write_frame() will wait until it has at least one packet
+ * for each stream before actually writing any packets to the output file.
+ * When some streams are "sparse" (i.e. there are large gaps between
+ * successive packets), this can result in excessive buffering.
+ *
+ * This field specifies the maximum difference between the timestamps of the
+ * first and the last packet in the muxing queue, above which libavformat
+ * will output a packet regardless of whether it has queued a packet for all
+ * the streams.
+ *
+ * Muxing only, set by the caller before avformat_write_header().
*/
- struct AVPacketList *raw_packet_buffer;
- struct AVPacketList *raw_packet_buffer_end;
+ int64_t max_interleave_delta;
+
/**
- * Remaining size available for raw_packet_buffer, in bytes.
+ * Allow non-standard and experimental extension
+ * @see AVCodecContext.strict_std_compliance
*/
-#define RAW_PACKET_BUFFER_SIZE 2500000
- int raw_packet_buffer_remaining_size;
+ int strict_std_compliance;
/**
- * This buffer is only needed when packets were already buffered but
- * not decoded, for example to get the codec parameters in MPEG
- * streams.
+ * 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_*.
*/
- struct AVPacketList *packet_buffer;
- struct AVPacketList *packet_buffer_end;
+ int event_flags;
+#define AVFMT_EVENT_FLAG_METADATA_UPDATED 0x0001 ///< The call resulted in updated metadata.
- /* av_read_frame() support */
- AVStream *cur_st;
+ /**
+ * Maximum number of packets to read while waiting for the first timestamp.
+ * Decoding only.
+ */
+ int max_ts_probe;
- /* av_seek_frame() support */
- int64_t data_offset; /**< offset of the first packet */
-#endif
+ /**
+ * 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
+
+ /**
+ * An opaque field for libavformat internal usage.
+ * Must not be accessed in any way by callers.
+ */
+ AVFormatInternal *internal;
+
+ /**
+ * Arbitrary user data set by the caller.
+ */
+ void *opaque;
+
+ /**
+ * 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.
+ */
+ int (*io_open)(struct AVFormatContext *s, AVIOContext **pb, const char *url,
+ int flags, AVDictionary **options);
+
+ /**
+ * A callback for closing the streams opened with AVFormatContext.io_open().
+ */
+ void (*io_close)(struct AVFormatContext *s, AVIOContext *pb);
+
+ /**
+ * 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.
+ */
+ char *protocol_blacklist;
+
+ /**
+ * 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.
+ */
+ char *protocol_whitelist;
} AVFormatContext;
typedef struct AVPacketList {
* 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.
*
* 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);
/**
* 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.
*/
/**
* 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
/**
* Open an input stream and read the header. The codecs are not opened.
- * The stream must be closed with av_close_input_file().
+ * The stream must be closed with avformat_close_input().
*
* @param ps Pointer to user-supplied AVFormatContext (allocated by avformat_alloc_context).
* May be a pointer to NULL, in which case an AVFormatContext is allocated by this
AVCodec **decoder_ret,
int flags);
-/**
- * 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 on error
- */
-int av_read_packet(AVFormatContext *s, AVPacket *pkt);
-
/**
* Return the next frame of a stream.
* This function returns what is stored in the file, and does not validate
* omit invalid data between valid frames so as to give the decoder the maximum
* information possible for decoding.
*
- * 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.
+ * 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.
*
* pkt->pts, pkt->dts and pkt->duration are always set to correct
* values in AVStream.time_base units (and guessed if the format cannot
/**
* 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.
* 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
*/
int av_read_pause(AVFormatContext *s);
-#if FF_API_CLOSE_INPUT_FILE
-/**
- * @deprecated use avformat_close_input()
- * Close a media file (but not its codecs).
- *
- * @param s media file handle
- */
-attribute_deprecated
-void av_close_input_file(AVFormatContext *s);
-#endif
-
/**
* Close an opened input AVFormatContext. Free it and all its contents
* and set *s to NULL.
* @}
*/
-#if FF_API_SET_PTS_INFO
-/**
- * @deprecated this function is not supposed to be called outside of lavf
- */
-attribute_deprecated
-void av_set_pts_info(AVStream *s, int pts_wrap_bits,
- unsigned int pts_num, unsigned int pts_den);
-#endif
-
#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
#define AVSEEK_FLAG_FRAME 8 ///< seeking based on frame number
-#if FF_API_SEEK_PUBLIC
-attribute_deprecated
-int av_seek_frame_binary(AVFormatContext *s, int stream_index,
- int64_t target_ts, int flags);
-attribute_deprecated
-void av_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp);
-attribute_deprecated
-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 ));
-#endif
-
/**
* @addtogroup lavf_encoding
* @{
*
* @param s Media file handle, must be allocated with avformat_alloc_context().
* Its oformat field must be set to the desired output format;
- * Its pb field must be set to an already openened AVIOContext.
+ * Its pb field must be set to an already opened AVIOContext.
* @param options An AVDictionary filled with AVFormatContext and muxer-private options.
* On return this parameter will be destroyed and replaced with a dict containing
* options that were not found. May be NULL.
/**
* 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.
+ * This function passes the packet directly to the muxer, without any buffering
+ * or reordering. The caller is responsible for correctly interleaving the
+ * packets if the format requires it. Callers that want libavformat to handle
+ * the interleaving should call av_interleaved_write_frame() instead of this
+ * function.
*
* @param s media file handle
- * @param pkt The packet, which contains the stream_index, buf/buf_size,
- * dts/pts, ...
- * This 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.
+ * @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).
+ * <br>
+ * 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.
+ * <br>
+ * 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".
+ * <br>
+ * 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()
*/
int av_write_frame(AVFormatContext *s, AVPacket *pkt);
/**
* Write 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.
+ * This function will buffer the packets internally as needed to make sure the
+ * packets in the output file are properly interleaved in the order of
+ * increasing dts. Callers doing their own interleaving should call
+ * av_write_frame() instead of this function.
*
- * @param s media file handle
- * @param pkt The packet containing the data to be written. Libavformat takes
- * ownership of the data and will free it when it sees fit using the packet's
- * @ref AVPacket.destruct "destruct" field. The caller must not access the data
- * after this function returns, as it may already be freed.
- * 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.
- *
- * @return 0 on success, a negative AVERROR on error.
- */
-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 that calling av_free_packet()
- * on them is still safe.
+ * 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 out the interleaved packet will be output here
- * @param pkt 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 occurred
+ * @param pkt The packet containing the data to be written.
+ * <br>
+ * 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.
+ * <br>
+ * This parameter can be NULL (at any time, not just at the end), to
+ * flush the interleaving queues.
+ * <br>
+ * 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".
+ * <br>
+ * 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
*/
-int av_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out,
- AVPacket *pkt, int flush);
+int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt);
/**
* Write the stream trailer to an output media file and free the
* file private data.
*
- * May only be called after a successful call to av_write_header.
+ * May only be called after a successful call to avformat_write_header.
*
* @param s media file handle
* @return 0 if OK, AVERROR_xxx on error
/**
* Guess the codec ID based upon muxer and filename.
*/
-enum CodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name,
+enum AVCodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name,
const char *filename, const char *mime_type,
enum AVMediaType type);
* @ingroup libavf
* @{
*
- * Miscelaneous utility functions related to both muxing and demuxing
+ * Miscellaneous utility functions related to both muxing and demuxing
* (or neither).
*/
*
* @see av_hex_dump_log, av_pkt_dump2, av_pkt_dump_log2
*/
-void av_hex_dump(FILE *f, uint8_t *buf, int size);
+void av_hex_dump(FILE *f, const uint8_t *buf, int size);
/**
* Send a nice hexadecimal dump of a buffer to the log.
*
* @see av_hex_dump, av_pkt_dump2, av_pkt_dump_log2
*/
-void av_hex_dump_log(void *avcl, int level, uint8_t *buf, int size);
+void av_hex_dump_log(void *avcl, int level, const uint8_t *buf, int size);
/**
* Send a nice dump of a packet to the specified file stream.
AVStream *st);
/**
- * Get the CodecID for the given codec tag tag.
- * If no codec id is found returns CODEC_ID_NONE.
+ * Get the AVCodecID for the given codec tag tag.
+ * If no codec id is found returns AV_CODEC_ID_NONE.
*
* @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 CodecID av_codec_get_id(const struct AVCodecTag * const *tags, unsigned int tag);
+enum AVCodecID av_codec_get_id(const struct AVCodecTag * const *tags, unsigned int tag);
/**
* Get the codec tag for the given codec id id.
*
* @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 CodecID id);
+unsigned int av_codec_get_tag(const struct AVCodecTag * const *tags, enum AVCodecID id);
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 >=
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,
int is_output);
-/**
- * Get the current time in microseconds.
- */
-int64_t av_gettime(void);
-
/**
* Return in 'buf' the path with '%d' replaced by a number.
*
/**
* Generate an SDP for an RTP session.
*
+ * Note, this overwrites the id values of AVStreams in the muxer contexts
+ * for getting unique dynamic payload types.
+ *
* @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,
* 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);
/**
* 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 CodecID codec_id, int std_compliance);
+int avformat_query_codec(const AVOutputFormat *ofmt, enum AVCodecID codec_id,
+ int std_compliance);
+
+/**
+ * @defgroup riff_fourcc RIFF FourCCs
+ * @{
+ * Get the tables mapping RIFF FourCCs to libavcodec AVCodecIDs. The tables are
+ * meant to be passed to av_codec_get_id()/av_codec_get_tag() as in the
+ * following code:
+ * @code
+ * uint32_t tag = MKTAG('H', '2', '6', '4');
+ * const struct AVCodecTag *table[] = { avformat_get_riff_video_tags(), 0 };
+ * enum AVCodecID id = av_codec_get_id(table, tag);
+ * @endcode
+ */
+/**
+ * @return the table mapping RIFF FourCCs for video to libavcodec AVCodecID.
+ */
+const struct AVCodecTag *avformat_get_riff_video_tags(void);
+/**
+ * @return the table mapping RIFF FourCCs for audio to AVCodecID.
+ */
+const struct AVCodecTag *avformat_get_riff_audio_tags(void);
+/**
+ * @}
+ */
/**
* @}
projects / ffmpeg / blobdiff