Libav 0.7.1
Data Structures | Defines | Typedefs | Enumerations | Functions
libavformat/avformat.h File Reference
#include <time.h>
#include <stdio.h>
#include "libavcodec/avcodec.h"
#include "libavutil/dict.h"
#include "avio.h"
#include "libavformat/version.h"

Go to the source code of this file.

Data Structures

struct  AVFrac
 The exact value of the fractional number is: 'val + num / den'. More...
struct  AVProbeData
 This structure contains the data a format has to probe a file. More...
struct  AVFormatParameters
struct  AVOutputFormat
struct  AVInputFormat
struct  AVIndexEntry
struct  AVStream
 Stream structure. More...
struct  AVProgram
 New fields can be added to the end with minor version bumps. More...
struct  AVChapter
struct  AVFormatContext
 Format I/O context. More...
struct  AVPacketList

Defines

#define AV_METADATA_MATCH_CASE   AV_DICT_MATCH_CASE
#define AV_METADATA_IGNORE_SUFFIX   AV_DICT_IGNORE_SUFFIX
#define AV_METADATA_DONT_STRDUP_KEY   AV_DICT_DONT_STRDUP_KEY
#define AV_METADATA_DONT_STRDUP_VAL   AV_DICT_DONT_STRDUP_VAL
#define AV_METADATA_DONT_OVERWRITE   AV_DICT_DONT_OVERWRITE
#define AVPROBE_SCORE_MAX   100
 maximum score, half of that is used for file-extension-based detection
#define AVPROBE_PADDING_SIZE   32
 extra allocated bytes at the end of the probe buffer
#define AVFMT_NOFILE   0x0001
 Demuxer will use avio_open, no opened file should be provided by the caller.
#define AVFMT_NEEDNUMBER   0x0002
 Needs 'd' in filename.
#define AVFMT_SHOW_IDS   0x0008
 Show format stream IDs numbers.
#define AVFMT_RAWPICTURE   0x0020
 Format wants AVPicture structure for raw picture data.
#define AVFMT_GLOBALHEADER   0x0040
 Format wants global header.
#define AVFMT_NOTIMESTAMPS   0x0080
 Format does not need / have any timestamps.
#define AVFMT_GENERIC_INDEX   0x0100
 Use generic index building code.
#define AVFMT_TS_DISCONT   0x0200
 Format allows timestamp discontinuities.
#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 AVINDEX_KEYFRAME   0x0001
#define AV_DISPOSITION_DEFAULT   0x0001
#define AV_DISPOSITION_DUB   0x0002
#define AV_DISPOSITION_ORIGINAL   0x0004
#define AV_DISPOSITION_COMMENT   0x0008
#define AV_DISPOSITION_LYRICS   0x0010
#define AV_DISPOSITION_KARAOKE   0x0020
#define AV_DISPOSITION_FORCED   0x0040
 Track should be used during playback by default.
#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
#define MAX_REORDER_DELAY   16
#define MAX_PROBE_PACKETS   2500
 Number of packets to buffer for codec probing NOT PART OF PUBLIC API.
#define MAX_STD_TIMEBASES   (60*12+5)
 Stream informations used internally by av_find_stream_info()
#define AV_PROGRAM_RUNNING   1
#define AVFMTCTX_NOHEADER   0x0001
 signal that no header is present (streams are added dynamically)
#define AVFMT_NOOUTPUTLOOP   -1
#define AVFMT_INFINITEOUTPUTLOOP   0
#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_NONBLOCK   0x0004
 Do not block when reading packets from input.
#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_RTP_HINT   0x0040
 Deprecated, use the -movflags rtphint muxer specific AVOption instead.
#define AVFMT_FLAG_CUSTOM_IO   0x0080
 The caller has supplied a custom AVIOContext, don't avio_close() it.
#define FF_FDEBUG_TS   0x0001
#define RAW_PACKET_BUFFER_SIZE   2500000
 Remaining size available for raw_packet_buffer, in bytes.
#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

Typedefs

typedef attribute_deprecated
AVDictionary 
AVMetadata
typedef attribute_deprecated
AVDictionaryEntry 
AVMetadataTag
typedef struct AVMetadataConv AVMetadataConv
typedef struct AVFrac AVFrac
 The exact value of the fractional number is: 'val + num / den'.
typedef struct AVProbeData AVProbeData
 This structure contains the data a format has to probe a file.
typedef struct AVFormatParameters AVFormatParameters
typedef struct AVOutputFormat AVOutputFormat
typedef struct AVInputFormat AVInputFormat
typedef struct AVIndexEntry AVIndexEntry
typedef struct AVStream AVStream
 Stream structure.
typedef struct AVProgram AVProgram
 New fields can be added to the end with minor version bumps.
typedef struct AVChapter AVChapter
typedef struct AVFormatContext AVFormatContext
 Format I/O context.
typedef struct AVPacketList AVPacketList

Enumerations

enum  AVStreamParseType {
  AVSTREAM_PARSE_NONE, AVSTREAM_PARSE_FULL, AVSTREAM_PARSE_HEADERS, AVSTREAM_PARSE_TIMESTAMPS,
  AVSTREAM_PARSE_FULL_ONCE
}

Functions

unsigned avformat_version (void)
 Return the LIBAVFORMAT_VERSION_INT constant.
const char * avformat_configuration (void)
 Return the libavformat build-time configuration.
const char * avformat_license (void)
 Return the libavformat license.
attribute_deprecated
AVDictionaryEntry
av_metadata_get (AVDictionary *m, const char *key, const AVDictionaryEntry *prev, int flags)
 Get a metadata element with matching key.
attribute_deprecated int av_metadata_set2 (AVDictionary **pm, const char *key, const char *value, int flags)
 Set the given tag in *pm, overwriting an existing tag.
attribute_deprecated void av_metadata_conv (struct AVFormatContext *ctx, const AVMetadataConv *d_conv, const AVMetadataConv *s_conv)
 This function is provided for compatibility reason and currently does nothing.
attribute_deprecated void av_metadata_copy (AVDictionary **dst, AVDictionary *src, int flags)
 Copy metadata from one AVDictionary struct into another.
attribute_deprecated void av_metadata_free (AVDictionary **m)
 Free all the memory allocated for an AVDictionary struct.
int av_get_packet (AVIOContext *s, AVPacket *pkt, int size)
 Allocate and read the payload of a packet and initialize its fields with default values.
int av_append_packet (AVIOContext *s, AVPacket *pkt, int size)
 Read data and append it to the current content of the AVPacket.
AVInputFormatav_iformat_next (AVInputFormat *f)
 If f is NULL, returns the first registered input format, if f is non-NULL, returns the next registered input format after f or NULL if f is the last one.
AVOutputFormatav_oformat_next (AVOutputFormat *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.
attribute_deprecated enum CodecID av_guess_image2_codec (const char *filename)
void av_register_input_format (AVInputFormat *format)
void av_register_output_format (AVOutputFormat *format)
AVOutputFormatav_guess_format (const char *short_name, const char *filename, const char *mime_type)
 Return the output format in the list of registered output formats which best matches the provided parameters, or return NULL if there is no match.
enum CodecID av_guess_codec (AVOutputFormat *fmt, const char *short_name, const char *filename, const char *mime_type, enum AVMediaType type)
 Guess the codec ID based upon muxer and filename.
void av_hex_dump (FILE *f, uint8_t *buf, int size)
 Send a nice hexadecimal dump of a buffer to the specified file stream.
void av_hex_dump_log (void *avcl, int level, uint8_t *buf, int size)
 Send a nice hexadecimal dump of a buffer to the log.
void av_pkt_dump2 (FILE *f, AVPacket *pkt, int dump_payload, AVStream *st)
 Send a nice dump of a packet to the specified file stream.
void av_pkt_dump_log2 (void *avcl, int level, AVPacket *pkt, int dump_payload, AVStream *st)
 Send a nice dump of a packet to the log.
attribute_deprecated void av_pkt_dump (FILE *f, AVPacket *pkt, int dump_payload)
attribute_deprecated void av_pkt_dump_log (void *avcl, int level, AVPacket *pkt, int dump_payload)
void av_register_all (void)
 Initialize libavformat and register all the muxers, demuxers and protocols.
enum CodecID av_codec_get_id (const struct AVCodecTag *const *tags, unsigned int tag)
 Get the CodecID for the given codec tag tag.
unsigned int av_codec_get_tag (const struct AVCodecTag *const *tags, enum CodecID id)
 Get the codec tag for the given codec id id.
AVInputFormatav_find_input_format (const char *short_name)
 Find AVInputFormat based on the short name of the input format.
AVInputFormatav_probe_input_format (AVProbeData *pd, int is_opened)
 Guess the file format.
AVInputFormatav_probe_input_format2 (AVProbeData *pd, int is_opened, int *score_max)
 Guess the file format.
int av_probe_input_buffer (AVIOContext *pb, AVInputFormat **fmt, const char *filename, void *logctx, unsigned int offset, unsigned int max_probe_size)
 Probe a bytestream to determine the input format.
attribute_deprecated int av_open_input_stream (AVFormatContext **ic_ptr, AVIOContext *pb, const char *filename, AVInputFormat *fmt, AVFormatParameters *ap)
 Allocate all the structures needed to read an input stream.
attribute_deprecated int av_open_input_file (AVFormatContext **ic_ptr, const char *filename, AVInputFormat *fmt, int buf_size, AVFormatParameters *ap)
 Open a media file as input.
int avformat_open_input (AVFormatContext **ps, const char *filename, AVInputFormat *fmt, AVDictionary **options)
 Open an input stream and read the header.
AVFormatContextavformat_alloc_context (void)
 Allocate an AVFormatContext.
int av_find_stream_info (AVFormatContext *ic)
 Read packets of a media file to get stream information.
int av_find_best_stream (AVFormatContext *ic, enum AVMediaType type, int wanted_stream_nb, int related_stream, AVCodec **decoder_ret, int flags)
 Find the "best" stream in the file.
int av_read_packet (AVFormatContext *s, AVPacket *pkt)
 Read a transport packet from a media file.
int av_read_frame (AVFormatContext *s, AVPacket *pkt)
 Return the next frame of a stream.
int av_seek_frame (AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
 Seek to the keyframe at timestamp.
int avformat_seek_file (AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
 Seek to timestamp ts.
int av_read_play (AVFormatContext *s)
 Start playing a network-based stream (e.g.
int av_read_pause (AVFormatContext *s)
 Pause a network-based stream (e.g.
void av_close_input_stream (AVFormatContext *s)
 Free a AVFormatContext allocated by av_open_input_stream.
void av_close_input_file (AVFormatContext *s)
 Close a media file (but not its codecs).
void avformat_free_context (AVFormatContext *s)
 Free an AVFormatContext and all its streams.
AVStreamav_new_stream (AVFormatContext *s, int id)
 Add a new stream to a media file.
AVProgramav_new_program (AVFormatContext *s, int id)
void av_set_pts_info (AVStream *s, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
 Set the pts for a given stream.
int av_find_default_stream_index (AVFormatContext *s)
int av_index_search_timestamp (AVStream *st, int64_t timestamp, int flags)
 Get the index for a specific timestamp.
int av_add_index_entry (AVStream *st, int64_t pos, int64_t timestamp, int size, int distance, int flags)
 Add an index entry into a sorted list.
int av_seek_frame_binary (AVFormatContext *s, int stream_index, int64_t target_ts, int flags)
 Perform a binary search using av_index_search_timestamp() and AVInputFormat.read_timestamp().
void av_update_cur_dts (AVFormatContext *s, AVStream *ref_st, int64_t timestamp)
 Update cur_dts of all streams based on the given timestamp and AVStream.
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))
 Perform a binary search using read_timestamp().
attribute_deprecated int av_set_parameters (AVFormatContext *s, AVFormatParameters *ap)
 media file output
void av_url_split (char *proto, int proto_size, char *authorization, int authorization_size, char *hostname, int hostname_size, int *port_ptr, char *path, int path_size, const char *url)
 Split a URL string into components.
int avformat_write_header (AVFormatContext *s, AVDictionary **options)
 Allocate the stream private data and write the stream header to an output media file.
attribute_deprecated int av_write_header (AVFormatContext *s)
 Allocate the stream private data and write the stream header to an output media file.
int av_write_frame (AVFormatContext *s, AVPacket *pkt)
 Write a packet to an output media file.
int av_interleaved_write_frame (AVFormatContext *s, AVPacket *pkt)
 Write a packet to an output media file ensuring correct interleaving.
int av_interleave_packet_per_dts (AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush)
 Interleave a packet per dts in an output media file.
int av_write_trailer (AVFormatContext *s)
 Write the stream trailer to an output media file and free the file private data.
attribute_deprecated void dump_format (AVFormatContext *ic, int index, const char *url, int is_output)
void av_dump_format (AVFormatContext *ic, int index, const char *url, int is_output)
attribute_deprecated int64_t parse_date (const char *datestr, int duration)
 Parse datestr and return a corresponding number of microseconds.
int64_t av_gettime (void)
 Get the current time in microseconds.
attribute_deprecated int find_info_tag (char *arg, int arg_size, const char *tag1, const char *info)
int av_get_frame_filename (char *buf, int buf_size, const char *path, int number)
 Return in 'buf' the path with 'd' replaced by a number.
int av_filename_number_test (const char *filename)
 Check whether filename actually is a numbered sequence generator.
int av_sdp_create (AVFormatContext *ac[], int n_files, char *buf, int size)
 Generate an SDP for an RTP session.
attribute_deprecated int avf_sdp_create (AVFormatContext *ac[], int n_files, char *buff, int size)
int av_match_ext (const char *filename, const char *extensions)
 Return a positive value if the given filename has one of the given extensions, 0 otherwise.

Define Documentation

#define AV_DISPOSITION_CLEAN_EFFECTS   0x0200

stream without voice

Definition at line 480 of file avformat.h.

Referenced by av_find_stream_info(), dump_stream_format(), ff_parse_mpeg2_descriptor(), and mpegts_write_pmt().

#define AV_DISPOSITION_COMMENT   0x0008

Definition at line 468 of file avformat.h.

Referenced by av_find_stream_info(), and dump_stream_format().

#define AV_DISPOSITION_DEFAULT   0x0001

Definition at line 465 of file avformat.h.

Referenced by dump_stream_format(), matroska_read_header(), and mkv_write_tracks().

#define AV_DISPOSITION_DUB   0x0002

Definition at line 466 of file avformat.h.

Referenced by dump_stream_format().

#define AV_DISPOSITION_FORCED   0x0040

Track should be used during playback by default.

Useful for subtitle track that should be displayed even when user did not explicitly ask for subtitles.

Definition at line 477 of file avformat.h.

Referenced by dump_stream_format(), and matroska_read_header().

#define AV_DISPOSITION_HEARING_IMPAIRED   0x0080

stream for hearing impaired audiences

Definition at line 478 of file avformat.h.

Referenced by av_find_best_stream(), av_find_stream_info(), dump_stream_format(), ff_parse_mpeg2_descriptor(), mpegts_write_pmt(), and parse_chunks().

#define AV_DISPOSITION_KARAOKE   0x0020

Definition at line 470 of file avformat.h.

Referenced by av_find_stream_info(), and dump_stream_format().

#define AV_DISPOSITION_LYRICS   0x0010

Definition at line 469 of file avformat.h.

Referenced by dump_stream_format().

#define AV_DISPOSITION_ORIGINAL   0x0004

Definition at line 467 of file avformat.h.

Referenced by dump_stream_format().

#define AV_DISPOSITION_VISUAL_IMPAIRED   0x0100

stream for visual impaired audiences

Definition at line 479 of file avformat.h.

Referenced by av_find_best_stream(), av_find_stream_info(), dump_stream_format(), ff_parse_mpeg2_descriptor(), mpegts_write_pmt(), and parse_chunks().

#define AV_PROGRAM_RUNNING   1

Definition at line 629 of file avformat.h.

#define AVFMT_FLAG_CUSTOM_IO   0x0080

The caller has supplied a custom AVIOContext, don't avio_close() it.

Definition at line 740 of file avformat.h.

Referenced by av_close_input_file(), avformat_open_input(), and init_input().

#define AVFMT_FLAG_GENPTS   0x0001

Generate missing pts even if it requires parsing future frames.

Definition at line 731 of file avformat.h.

Referenced by av_read_frame(), decode_thread(), and open_input_stream().

#define AVFMT_FLAG_IGNDTS   0x0008

Ignore DTS on frames that contain both DTS & PTS.

Definition at line 734 of file avformat.h.

Referenced by compute_pkt_fields().

#define AVFMT_FLAG_IGNIDX   0x0002

Ignore index.

Definition at line 732 of file avformat.h.

Referenced by avi_read_header(), gxf_read_index(), matroska_execute_seekhead(), and rm_read_header().

#define AVFMT_FLAG_NOFILLIN   0x0010

Do not infer any values from other values, just return what is stored in the container.

Definition at line 735 of file avformat.h.

Referenced by compute_pkt_fields().

#define AVFMT_FLAG_NONBLOCK   0x0004

Do not block when reading packets from input.

Definition at line 733 of file avformat.h.

Referenced by device_open(), fbdev_read_header(), fbdev_read_packet(), ff_alsa_open(), opt_input_file(), opt_output_file(), and vfw_read_packet().

#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.

Definition at line 736 of file avformat.h.

Referenced by av_find_stream_info(), and av_read_frame_internal().

#define AVFMT_FLAG_RTP_HINT   0x0040

Deprecated, use the -movflags rtphint muxer specific AVOption instead.

Definition at line 738 of file avformat.h.

Referenced by mov_write_header().

#define AVFMT_GENERIC_INDEX   0x0100

Use generic index building code.

Definition at line 269 of file avformat.h.

Referenced by av_read_frame_internal().

#define AVFMT_GLOBALHEADER   0x0040
#define AVFMT_INFINITEOUTPUTLOOP   0

Definition at line 724 of file avformat.h.

#define AVFMT_NEEDNUMBER   0x0002

Needs 'd' in filename.

Definition at line 263 of file avformat.h.

Referenced by avformat_open_input(), and opt_output_file().

#define AVFMT_NOBINSEARCH   0x2000

Format does not allow to fallback to binary search via read_timestamp.

Definition at line 274 of file avformat.h.

Referenced by av_seek_frame().

#define AVFMT_NODIMENSIONS   0x0800

Format does not need width/height.

Definition at line 272 of file avformat.h.

Referenced by avformat_write_header().

#define AVFMT_NOFILE   0x0001

Demuxer will use avio_open, no opened file should be provided by the caller.

Definition at line 262 of file avformat.h.

Referenced by av_close_input_file(), av_estimate_timings(), av_open_input_stream(), av_probe_input_format2(), ffmpeg_exit(), init_input(), main(), opt_output_file(), probe(), and read_header().

#define AVFMT_NOGENSEARCH   0x4000

Format does not allow to fallback to generic search.

Definition at line 275 of file avformat.h.

Referenced by av_seek_frame().

#define AVFMT_NOOUTPUTLOOP   -1

Definition at line 723 of file avformat.h.

#define AVFMT_NOSTREAMS   0x1000

Format does not require any streams.

Definition at line 273 of file avformat.h.

Referenced by avformat_write_header(), and transcode().

#define AVFMT_NOTIMESTAMPS   0x0080

Format does not need / have any timestamps.

Definition at line 268 of file avformat.h.

Referenced by av_interleaved_write_frame(), and av_write_frame().

#define AVFMT_RAWPICTURE   0x0020

Format wants AVPicture structure for raw picture data.

Definition at line 265 of file avformat.h.

Referenced by do_video_out(), open_video(), output_packet(), and write_video_frame().

#define AVFMT_SHOW_IDS   0x0008

Show format stream IDs numbers.

Definition at line 264 of file avformat.h.

Referenced by dump_stream_format(), and show_stream().

#define AVFMT_TS_DISCONT   0x0200

Format allows timestamp discontinuities.

Note, muxers always require valid (monotone) timestamps

Definition at line 270 of file avformat.h.

Referenced by decode_thread(), and transcode().

#define AVFMT_VARIABLE_FPS   0x0400

Format allows variable fps.

Definition at line 271 of file avformat.h.

Referenced by do_video_out().

#define AVFMTCTX_NOHEADER   0x0001
#define AVINDEX_KEYFRAME   0x0001
#define AVPROBE_PADDING_SIZE   32

extra allocated bytes at the end of the probe buffer

Definition at line 240 of file avformat.h.

Referenced by av_probe_input_buffer(), av_read_packet(), and main().

#define AVPROBE_SCORE_MAX   100
#define AVSEEK_FLAG_ANY   4
#define AVSEEK_FLAG_BACKWARD   1
#define AVSEEK_FLAG_BYTE   2
#define AVSEEK_FLAG_FRAME   8

seeking based on frame number

Definition at line 1271 of file avformat.h.

Referenced by read_seek(), and read_seek2().

#define FF_FDEBUG_TS   0x0001

Definition at line 804 of file avformat.h.

Referenced by av_read_frame_internal().

#define MAX_PROBE_PACKETS   2500

Number of packets to buffer for codec probing NOT PART OF PUBLIC API.

Definition at line 597 of file avformat.h.

Referenced by av_new_stream(), ff_read_frame_flush(), ff_store_parser_state(), and set_codec_from_probe_data().

#define MAX_REORDER_DELAY   16
#define MAX_STD_TIMEBASES   (60*12+5)

Stream informations used internally by av_find_stream_info()

Definition at line 619 of file avformat.h.

#define RAW_PACKET_BUFFER_SIZE   2500000

Remaining size available for raw_packet_buffer, in bytes.

NOT PART OF PUBLIC API

Definition at line 823 of file avformat.h.

Referenced by avformat_open_input(), ff_store_parser_state(), and flush_packet_queue().


Typedef Documentation

typedef struct AVChapter AVChapter

Format I/O context.

New fields can be added to the end with minor version bumps. Removal, reordering and changes to existing fields require a major version bump. sizeof(AVFormatContext) must not be used outside libav*.

typedef struct AVFrac AVFrac

The exact value of the fractional number is: 'val + num / den'.

num is assumed to be 0 <= num < den.

typedef struct AVIndexEntry AVIndexEntry
typedef struct AVInputFormat AVInputFormat
typedef struct AVPacketList AVPacketList
typedef struct AVProbeData AVProbeData

This structure contains the data a format has to probe a file.

typedef struct AVProgram AVProgram

New fields can be added to the end with minor version bumps.

Removal, reordering and changes to existing fields require a major version bump. sizeof(AVProgram) must not be used outside libav*.

typedef struct AVStream AVStream

Stream structure.

New fields can be added to the end with minor version bumps. Removal, reordering and changes to existing fields require a major version bump. sizeof(AVStream) must not be used outside libav*.


Enumeration Type Documentation

Enumerator:
AVSTREAM_PARSE_NONE 
AVSTREAM_PARSE_FULL 

full parsing and repack

AVSTREAM_PARSE_HEADERS 

Only parse headers, do not repack.

AVSTREAM_PARSE_TIMESTAMPS 

full parsing and interpolation of timestamps for frames not starting on a packet boundary

AVSTREAM_PARSE_FULL_ONCE 

full parsing and repack of the first frame only, only implemented for H.264 currently

Definition at line 448 of file avformat.h.


Function Documentation

int av_add_index_entry ( AVStream st,
int64_t  pos,
int64_t  timestamp,
int  size,
int  distance,
int  flags 
)
int av_append_packet ( AVIOContext s,
AVPacket pkt,
int  size 
)

Read data and append it to the current content of the AVPacket.

If pkt->size is 0 this is identical to av_get_packet. Note that this uses av_grow_packet and thus involves a realloc which is inefficient. Thus this function should only be used when there is no reasonable way to know (an upper bound of) the final size.

Parameters:
pktpacket
sizeamount of data to read
Returns:
>0 (read size) if OK, AVERROR_xxx otherwise, previous data will not be lost even if an error occurs.

Definition at line 284 of file utils.c.

Referenced by dfa_read_packet(), wc3_read_header(), wc3_read_packet(), and wv_read_packet().

void av_close_input_file ( AVFormatContext s)
void av_close_input_stream ( AVFormatContext s)

Free a AVFormatContext allocated by av_open_input_stream.

Parameters:
scontext to free

Definition at line 2583 of file utils.c.

Referenced by av_close_input_file(), ff_rtsp_close_streams(), http_receive_data(), and read_header().

enum CodecID av_codec_get_id ( const struct AVCodecTag *const *  tags,
unsigned int  tag 
)

Get the CodecID for the given codec tag tag.

If no codec id is found returns CODEC_ID_NONE.

Parameters:
tagslist of supported codec_id-codec_tag pairs, as stored in AVInputFormat.codec_tag and AVOutputFormat.codec_tag

Referenced by decode_stream_header(), and transcode().

unsigned int av_codec_get_tag ( const struct AVCodecTag *const *  tags,
enum CodecID  id 
)

Get the codec tag for the given codec id id.

If no codec tag is found returns 0.

Parameters:
tagslist of supported codec_id-codec_tag pairs, as stored in AVInputFormat.codec_tag and AVOutputFormat.codec_tag

Referenced by avformat_write_header(), and transcode().

void av_dump_format ( AVFormatContext ic,
int  index,
const char *  url,
int  is_output 
)

Definition at line 3309 of file utils.c.

Referenced by decode_thread(), dump_format(), main(), open_input_file(), opt_input_file(), and transcode().

int av_filename_number_test ( const char *  filename)

Check whether filename actually is a numbered sequence generator.

Parameters:
filenamepossible numbered sequence string
Returns:
1 if a valid numbered sequence string, 0 otherwise

Definition at line 300 of file utils.c.

Referenced by av_guess_format(), avformat_open_input(), opt_output_file(), and read_probe().

int av_find_best_stream ( AVFormatContext ic,
enum AVMediaType  type,
int  wanted_stream_nb,
int  related_stream,
AVCodec **  decoder_ret,
int  flags 
)

Find the "best" stream in the file.

The best stream is determined according to various heuristics as the most likely to be what the user expects. If the decoder parameter is non-NULL, av_find_best_stream will find the default decoder for the stream's codec; streams for which no decoder can be found are ignored.

Parameters:
icmedia file handle
typestream type: video, audio, subtitles, etc.
wanted_stream_nbuser-requested stream number, or -1 for automatic selection
related_streamtry to find a stream related (eg. in the same program) to this one, or -1 if none
decoder_retif non-NULL, returns the decoder for the selected stream
flagsflags; none are currently defined
Returns:
the non-negative stream number in case of success, AVERROR_STREAM_NOT_FOUND if no stream with the requested type could be found, AVERROR_DECODER_NOT_FOUND if streams were found but no decoder
Note:
If av_find_best_stream returns successfully and decoder_ret is not NULL, then *decoder_ret is guaranteed to be set to a valid AVCodec.

Definition at line 2510 of file utils.c.

Referenced by decode_thread(), and movie_init().

int av_find_default_stream_index ( AVFormatContext s)

Definition at line 1312 of file utils.c.

Referenced by av_seek_frame().

AVInputFormat* av_find_input_format ( const char *  short_name)

Find AVInputFormat based on the short name of the input format.

Definition at line 255 of file utils.c.

Referenced by http_receive_data(), movie_init(), opt_format(), opt_input_file(), parse_ffconfig(), and sap_read_header().

int av_find_stream_info ( AVFormatContext ic)

Read packets of a media file to get stream information.

This is useful for file formats with no headers such as MPEG. This function also computes the real framerate in case of MPEG-2 repeat frame mode. The logical file position is not changed by this function; examined packets may be buffered for later processing.

Parameters:
icmedia file handle
Returns:
>=0 if OK, AVERROR_xxx on error
Todo:
Let the user decide somehow what information is needed so that we do not waste time getting stuff the user does not need.

Definition at line 2207 of file utils.c.

Referenced by build_file_streams(), decode_thread(), main(), movie_init(), open_input_file(), open_input_stream(), and opt_input_file().

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(*)(struct AVFormatContext *, int, int64_t *, int64_t)  read_timestamp 
)

Perform a binary search using read_timestamp().

This is not supposed to be called directly by a user application, but by demuxers.

Parameters:
target_tstarget timestamp in the time base of the given stream
stream_indexstream number

Definition at line 1546 of file utils.c.

Referenced by av_seek_frame_binary(), and read_seek().

int av_get_frame_filename ( char *  buf,
int  buf_size,
const char *  path,
int  number 
)

Return in 'buf' the path with 'd' replaced by a number.

Also handles the '%0nd' format where 'n' is the total number of digits and '%%'.

Parameters:
bufdestination buffer
buf_sizedestination buffer size
pathnumbered sequence string
numberframe number
Returns:
0 if OK, -1 on format error

Definition at line 3420 of file utils.c.

Referenced by av_filename_number_test(), find_image_range(), and read_packet().

int av_get_packet ( AVIOContext s,
AVPacket pkt,
int  size 
)
int64_t av_gettime ( void  )
enum CodecID av_guess_codec ( AVOutputFormat fmt,
const char *  short_name,
const char *  filename,
const char *  mime_type,
enum AVMediaType  type 
)

Guess the codec ID based upon muxer and filename.

Definition at line 234 of file utils.c.

Referenced by new_audio_stream(), new_subtitle_stream(), and new_video_stream().

AVOutputFormat* av_guess_format ( const char *  short_name,
const char *  filename,
const char *  mime_type 
)

Return the output format in the list of registered output formats which best matches the provided parameters, or return NULL if there is no match.

Parameters:
short_nameif non-NULL checks if short_name matches with the names of the registered formats
filenameif non-NULL checks if filename terminates with the extensions of the registered formats
mime_typeif non-NULL checks if mime_type matches with the MIME type of the registered formats

Definition at line 199 of file utils.c.

Referenced by av_guess_format(), ff_rtp_chain_mux_open(), ffserver_guess_format(), main(), opt_output_file(), parse_ffconfig(), and rtp_new_av_stream().

attribute_deprecated enum CodecID av_guess_image2_codec ( const char *  filename)

Definition at line 202 of file img2.c.

void av_hex_dump ( FILE *  f,
uint8_t *  buf,
int  size 
)

Send a nice hexadecimal dump of a buffer to the specified file stream.

Parameters:
fThe file stream pointer where the dump should be sent to.
bufbuffer
sizebuffer size
See also:
av_hex_dump_log, av_pkt_dump2, av_pkt_dump_log2

Definition at line 3504 of file utils.c.

Referenced by pkt_dump_internal().

void av_hex_dump_log ( void *  avcl,
int  level,
uint8_t *  buf,
int  size 
)

Send a nice hexadecimal dump of a buffer to the log.

Parameters:
avclA pointer to an arbitrary struct of which the first field is a pointer to an AVClass struct.
levelThe importance level of the message, lower values signifying higher importance.
bufbuffer
sizebuffer size
See also:
av_hex_dump, av_pkt_dump2, av_pkt_dump_log2

Definition at line 3509 of file utils.c.

AVInputFormat* av_iformat_next ( AVInputFormat f)

If f is NULL, returns the first registered input format, if f is non-NULL, returns the next registered input format after f or NULL if f is the last one.

Definition at line 124 of file utils.c.

Referenced by av_find_input_format(), av_probe_input_format2(), opt_find(), probe(), show_formats(), and show_help().

int av_index_search_timestamp ( AVStream st,
int64_t  timestamp,
int  flags 
)

Get the index for a specific timestamp.

Parameters:
flagsif AVSEEK_FLAG_BACKWARD then the returned index will correspond to the timestamp which is <= the requested one, if backward is 0, then it will be >= if AVSEEK_FLAG_ANY seek to any frame, only keyframes otherwise
Returns:
< 0 if no such timestamp could be found

Definition at line 1479 of file utils.c.

Referenced by ape_read_seek(), asf_read_seek(), av_seek_frame_binary(), av_seek_frame_generic(), avi_read_packet(), avi_read_seek(), gxf_seek(), matroska_read_seek(), mov_seek_stream(), mpc8_read_seek(), mpc_read_seek(), nsv_read_seek(), read_packet(), read_seek(), rl2_read_seek(), tta_read_seek(), write_packet(), and wv_read_seek().

int av_interleave_packet_per_dts ( AVFormatContext s,
AVPacket out,
AVPacket pkt,
int  flush 
)

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.

Parameters:
smedia file handle
outthe interleaved packet will be output here
pktthe input packet
flush1 if no further packets are available as input and all remaining packets should be output
Returns:
1 if a packet was output, 0 if no packet could be output, < 0 if an error occurred

Definition at line 3077 of file utils.c.

Referenced by av_interleave_packet(), and gxf_interleave_packet().

int av_interleaved_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.

Parameters:
smedia file handle
pktThe packet, which contains the stream_index, buf/buf_size, dts/pts, ...
Returns:
< 0 on error, = 0 if OK, 1 if end of stream wanted

Definition at line 3123 of file utils.c.

Referenced by write_audio_frame(), write_frame(), and write_video_frame().

int av_match_ext ( const char *  filename,
const char *  extensions 
)

Return a positive value if the given filename has one of the given extensions, 0 otherwise.

Parameters:
extensionsa comma-separated list of filename extensions

Definition at line 154 of file utils.c.

Referenced by av_guess_format(), av_probe_input_format2(), http_parse_request(), ipod_get_codec_tag(), mpegts_probe(), and nsv_probe().

AVProgram* av_new_program ( AVFormatContext s,
int  id 
)

Definition at line 2693 of file utils.c.

Referenced by pat_cb(), and sdt_cb().

AVStream* av_new_stream ( AVFormatContext s,
int  id 
)

Add a new stream to a media file.

Can only be called in the read_header() function. If the flag AVFMTCTX_NOHEADER is in the format context, then new streams can be added in read_packet too.

Parameters:
smedia file handle
idfile-format-dependent stream ID

Definition at line 2642 of file utils.c.

Referenced by add_audio_stream(), add_dstream(), add_video_stream(), adts_aac_read_header(), aea_read_header(), aiff_read_header(), amr_read_header(), apc_read_header(), ape_read_header(), applehttp_read_header(), asf_read_stream_properties(), au_read_header(), audio_read_header(), avi_read_header(), avisynth_read_header(), avs_read_packet(), bfi_read_header(), cdata_read_header(), cin_read_header(), create_audio_stream(), create_stream(), daud_header(), dc1394_read_common(), decode_main_header(), dfa_read_header(), dv_extract_audio_info(), dv_init_demux(), dxa_read_header(), ea_read_header(), fbdev_read_header(), ff_raw_audio_read_header(), ff_raw_read_header(), ff_raw_video_read_header(), ff_rtp_chain_mux_open(), ffm_read_header(), film_read_header(), flac_read_header(), flic_read_header(), fourxm_read_header(), get_attachment(), get_sindex(), grab_read_header(), idcin_read_header(), iff_read_header(), ipmovie_read_header(), iss_read_header(), lmlm4_read_header(), lxf_read_header(), matroska_read_header(), mmf_read_header(), mov_read_trak(), mp3_read_header(), mpc8_read_header(), mpc_read_header(), mpegps_read_packet(), mpegts_push_data(), mpegts_read_header(), mpegts_set_stream_info(), msnwc_tcp_read_header(), mtv_read_header(), mxf_parse_structural_metadata(), mxg_read_header(), nc_read_header(), new_audio_stream(), new_data_stream(), new_stream(), new_subtitle_stream(), new_video_stream(), nsv_parse_NSVs_header(), nut_read_header(), nuv_header(), ogg_new_stream(), oma_read_header(), pmt_cb(), pva_read_header(), qcp_read_header(), r3d_read_red1(), read_desc_chunk(), read_header(), read_packet(), rl2_read_header(), rm_read_header(), rm_read_header_old(), roq_read_header(), roq_read_packet(), rpl_read_header(), rso_read_header(), sap_fetch_packet(), sap_read_header(), seq_read_header(), siff_parse_vbv1(), smacker_read_header(), sol_read_header(), sox_read_header(), spdif_read_packet(), srt_read_header(), str_read_packet(), swf_read_packet(), thp_read_header(), tmv_read_header(), tta_read_header(), txd_read_header(), v4l2_read_header(), vc1t_read_header(), vfw_read_header(), vid_read_header(), vmd_read_header(), voc_read_header(), vqf_read_header(), wc3_read_header(), wsaud_read_header(), wsvqa_read_header(), wv_read_header(), x11grab_read_header(), xa_read_header(), xwma_read_header(), yop_read_header(), and yuv4_read_header().

AVOutputFormat* av_oformat_next ( AVOutputFormat 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.

Definition at line 130 of file utils.c.

Referenced by av_guess_format(), opt_default(), opt_find(), show_formats(), and show_help().

attribute_deprecated int av_open_input_file ( AVFormatContext **  ic_ptr,
const char *  filename,
AVInputFormat fmt,
int  buf_size,
AVFormatParameters ap 
)

Open a media file as input.

The codecs are not opened. Only the file header (if present) is read.

Parameters:
ic_ptrThe opened media file handle is put here.
filenamefilename to open
fmtIf non-NULL, force the file format to use.
buf_sizeoptional buffer size (zero if default is OK)
apAdditional parameters needed when opening the file (NULL if default).
Returns:
0 if OK, AVERROR_xxx otherwise
Deprecated:
use avformat_open_input instead.

Definition at line 551 of file utils.c.

Referenced by main().

attribute_deprecated int av_open_input_stream ( AVFormatContext **  ic_ptr,
AVIOContext pb,
const char *  filename,
AVInputFormat fmt,
AVFormatParameters ap 
)

Allocate all the structures needed to read an input stream.

This does not open the needed codecs for decoding the stream[s].

Deprecated:
use avformat_open_input instead.

Allocate all the structures needed to read an input stream.

'fmt' must be specified.

Definition at line 439 of file utils.c.

attribute_deprecated void av_pkt_dump ( FILE *  f,
AVPacket pkt,
int  dump_payload 
)

Definition at line 3541 of file utils.c.

void av_pkt_dump2 ( FILE *  f,
AVPacket pkt,
int  dump_payload,
AVStream st 
)

Send a nice dump of a packet to the specified file stream.

Parameters:
fThe file stream pointer where the dump should be sent to.
pktpacket to dump
dump_payloadTrue if the payload must be displayed, too.
stAVStream that the packet belongs to

Definition at line 3548 of file utils.c.

attribute_deprecated void av_pkt_dump_log ( void *  avcl,
int  level,
AVPacket pkt,
int  dump_payload 
)

Definition at line 3554 of file utils.c.

void av_pkt_dump_log2 ( void *  avcl,
int  level,
AVPacket pkt,
int  dump_payload,
AVStream st 
)

Send a nice dump of a packet to the log.

Parameters:
avclA pointer to an arbitrary struct of which the first field is a pointer to an AVClass struct.
levelThe importance level of the message, lower values signifying higher importance.
pktpacket to dump
dump_payloadTrue if the payload must be displayed, too.
stAVStream that the packet belongs to

Definition at line 3561 of file utils.c.

Referenced by transcode().

int av_probe_input_buffer ( AVIOContext pb,
AVInputFormat **  fmt,
const char *  filename,
void *  logctx,
unsigned int  offset,
unsigned int  max_probe_size 
)

Probe a bytestream to determine the input format.

Each time a probe returns with a score that is too low, the probe buffer size is increased and another attempt is made. When the maximum probe size is reached, the input format with the highest score is returned.

Parameters:
pbthe bytestream to probe
fmtthe input format is put here
filenamethe filename of the stream
logctxthe log context
offsetthe offset within the bytestream to probe from
max_probe_sizethe maximum probe buffer size (zero for default)
Returns:
0 in case of success, a negative value corresponding to an AVERROR code otherwise

Definition at line 483 of file utils.c.

Referenced by applehttp_read_header(), and init_input().

AVInputFormat* av_probe_input_format ( AVProbeData pd,
int  is_opened 
)

Guess the file format.

Parameters:
is_openedWhether the file is already opened; determines whether demuxers with or without AVFMT_NOFILE are probed.

Definition at line 352 of file utils.c.

Referenced by init_input().

AVInputFormat* av_probe_input_format2 ( AVProbeData pd,
int  is_opened,
int *  score_max 
)

Guess the file format.

Parameters:
is_openedWhether the file is already opened; determines whether demuxers with or without AVFMT_NOFILE are probed.
score_maxA probe score larger that this is required to accept a detection, the variable is set to the actual detection score afterwards. If the score is <= AVPROBE_SCORE_MAX / 4 it is recommended to retry with a larger probe buffer.

Definition at line 306 of file utils.c.

Referenced by av_probe_input_buffer(), av_probe_input_format(), read_gab2_sub(), and set_codec_from_probe_data().

int av_read_frame ( AVFormatContext s,
AVPacket pkt 
)

Return the next frame of a stream.

This function returns what is stored in the file, and does not validate that what is there are valid frames for the decoder. It will split what is stored in the file into frames and return one for each call. It will not 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.

pkt->pts, pkt->dts and pkt->duration are always set to correct values in AVStream.time_base units (and guessed if the format cannot provide them). pkt->pts can be AV_NOPTS_VALUE if the video format has B-frames, so it is better to rely on pkt->dts if you do not decompress the payload.

Returns:
0 if OK, < 0 on error or end of file

Definition at line 1231 of file utils.c.

Referenced by applehttp_read_packet(), asf_read_pts(), av_seek_frame_generic(), decode_thread(), http_prepare_data(), main(), movie_get_frame(), mpc_read_seek(), sap_fetch_packet(), search_hi_lo_keyframes(), show_packets(), transcode(), and wv_read_seek().

int av_read_packet ( AVFormatContext s,
AVPacket pkt 
)

Read a transport packet from a media file.

This function is obsolete and should never be used. Use av_read_frame() instead.

Parameters:
smedia file handle
pktis filled
Returns:
0 if OK, AVERROR_xxx on error

Definition at line 689 of file utils.c.

Referenced by asfrtp_parse_packet(), av_estimate_timings_from_pts(), av_read_frame_internal(), extract_mpeg4_header(), get_subtitle_pkt(), read_gab2_sub(), and seek_subtitle().

int av_read_pause ( AVFormatContext s)

Pause a network-based stream (e.g.

RTSP stream).

Use av_read_play() to resume it.

Definition at line 2574 of file utils.c.

Referenced by decode_thread().

int av_read_play ( AVFormatContext s)

Start playing a network-based stream (e.g.

RTSP stream) at the current position.

Definition at line 2565 of file utils.c.

Referenced by decode_thread().

void av_register_all ( void  )

Initialize libavformat and register all the muxers, demuxers and protocols.

If you do not call this function, then you can select exactly which formats you want to support.

See also:
av_register_input_format()
av_register_output_format()
av_register_protocol()

Definition at line 40 of file allformats.c.

Referenced by main(), and movie_init().

void av_register_input_format ( AVInputFormat format)

Definition at line 136 of file utils.c.

void av_register_output_format ( AVOutputFormat format)

Definition at line 145 of file utils.c.

int av_sdp_create ( AVFormatContext ac[],
int  n_files,
char *  buf,
int  size 
)

Generate an SDP for an RTP session.

Parameters:
acarray of AVFormatContexts describing the RTP streams. If the array is composed by only one context, such context can contain multiple AVStreams (one AVStream per RTP stream). Otherwise, all the contexts in the array (an AVCodecContext per RTP stream) must contain only one AVStream.
n_filesnumber of AVCodecContexts contained in ac
bufbuffer where the SDP will be stored (must be allocated by the caller)
sizethe size of the buffer
Returns:
0 if OK, AVERROR_xxx on error

Definition at line 614 of file sdp.c.

Referenced by avf_sdp_create(), ff_rtsp_setup_output_streams(), prepare_sdp_description(), print_sdp(), and sap_write_header().

int av_seek_frame ( AVFormatContext s,
int  stream_index,
int64_t  timestamp,
int  flags 
)

Seek to the keyframe at timestamp.

'timestamp' in 'stream_index'.

Parameters:
stream_indexIf 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.
timestampTimestamp in AVStream.time_base units or, if no stream is specified, in AV_TIME_BASE units.
flagsflags which select direction and seeking mode
Returns:
>= 0 on success

Definition at line 1737 of file utils.c.

Referenced by avformat_seek_file(), movie_init(), open_input_stream(), and opt_input_file().

int av_seek_frame_binary ( AVFormatContext s,
int  stream_index,
int64_t  target_ts,
int  flags 
)

Perform a binary search using av_index_search_timestamp() and AVInputFormat.read_timestamp().

This is not supposed to be called directly by a user application, but by demuxers.

Parameters:
target_tstarget timestamp in the time base of the given stream
stream_indexstream number

Definition at line 1486 of file utils.c.

Referenced by asf_read_seek(), av_seek_frame(), ogg_read_seek(), and read_seek().

attribute_deprecated int av_set_parameters ( AVFormatContext s,
AVFormatParameters ap 
)

media file output

Deprecated:
pass the options to avformat_write_header directly.

Definition at line 2744 of file utils.c.

Referenced by ff_rtp_chain_mux_open(), and main().

void av_set_pts_info ( AVStream s,
int  pts_wrap_bits,
unsigned int  pts_num,
unsigned int  pts_den 
)

Set the pts for a given stream.

If the new values would be invalid (<= 0), it leaves the AVStream unchanged.

Parameters:
sstream
pts_wrap_bitsnumber of bits effectively used by the pts (used for wrap control, 33 is the value for MPEG)
pts_numnumerator to convert to seconds (MPEG: 1)
pts_dendenominator to convert to seconds (MPEG: 90000)

Definition at line 3677 of file utils.c.

Referenced by add_av_stream1(), adts_aac_read_header(), aiff_read_header(), aiff_write_header(), amr_read_header(), ape_read_header(), asf_read_stream_properties(), asf_write_header1(), asfrtp_parse_sdp_line(), au_read_header(), audio_read_header(), av_new_stream(), avi_read_header(), avi_write_header(), avisynth_read_header(), bfi_read_header(), cdata_read_header(), cin_read_header(), create_audio_stream(), create_stream(), dc1394_read_common(), decode_stream_header(), dfa_read_header(), dirac_header(), dv_extract_audio_info(), dv_extract_video_info(), dxa_read_header(), ea_read_header(), fbdev_read_header(), ff_raw_read_header(), ff_raw_video_read_header(), ff_rm_read_mdpr_codecdata(), ffm_read_header(), ffm_write_header(), film_read_header(), flac_header(), flac_read_header(), flic_read_header(), flv_write_header(), fourxm_read_header(), get_packet_header(), grab_read_header(), gxf_header(), gxf_write_header(), idcin_read_header(), iff_read_header(), ipmovie_read_header(), iss_read_header(), lmlm4_read_header(), lxf_read_header(), matroska_read_header(), mkv_write_tracks(), mmf_read_header(), mov_read_trak(), mov_write_header(), mp3_read_header(), mpc8_read_header(), mpc_read_header(), mpeg_mux_init(), mpegts_read_header(), mpegts_set_stream_info(), mpegts_write_header(), msnwc_tcp_read_header(), mtv_read_header(), mxf_parse_structural_metadata(), mxf_write_header(), mxg_read_header(), nc_read_header(), new_stream(), nsv_parse_NSVs_header(), nut_read_header(), nuv_header(), ogg_new_stream(), ogg_write_header(), ogm_header(), old_dirac_header(), oma_read_header(), pva_read_header(), qt_rtp_parse_packet(), r3d_read_red1(), read_gab2_sub(), read_header(), rl2_read_header(), roq_read_header(), roq_read_packet(), rpl_read_header(), rso_read_header(), seq_read_header(), siff_parse_vbv1(), skeleton_header(), smacker_read_header(), sol_read_header(), sox_read_header(), speex_header(), srt_read_header(), str_read_packet(), swf_read_packet(), theora_header(), thp_read_header(), tmv_read_header(), tta_read_header(), v4l2_read_header(), vc1t_read_header(), vc1test_write_header(), vfw_read_header(), vid_read_header(), vmd_read_header(), vorbis_header(), vqf_read_header(), wc3_read_header(), write_header(), wsaud_read_header(), wsvqa_read_header(), wv_read_header(), x11grab_read_header(), xa_read_header(), xwma_read_header(), yop_read_header(), and yuv4_read_header().

void av_update_cur_dts ( AVFormatContext s,
AVStream ref_st,
int64_t  timestamp 
)

Update cur_dts of all streams based on the given timestamp and AVStream.

Stream ref_st unchanged, others set cur_dts in their native time base. Only needed for timestamp wrapping or if (dts not set and pts!=dts).

Parameters:
timestampnew dts expressed in time_base of param ref_st
ref_streference stream giving time_base of param timestamp

Definition at line 1366 of file utils.c.

Referenced by av_seek_frame_binary(), av_seek_frame_byte(), av_seek_frame_generic(), matroska_read_seek(), and mxf_read_seek().

void av_url_split ( char *  proto,
int  proto_size,
char *  authorization,
int  authorization_size,
char *  hostname,
int  hostname_size,
int *  port_ptr,
char *  path,
int  path_size,
const char *  url 
)

Split a URL string into components.

The pointers to buffers for storing individual components may be null, in order to ignore that component. Buffers for components not found are set to empty strings. If the port is not found, it is set to a negative value.

Parameters:
protothe buffer for the protocol
proto_sizethe size of the proto buffer
authorizationthe buffer for the authorization
authorization_sizethe size of the authorization buffer
hostnamethe buffer for the host name
hostname_sizethe size of the hostname buffer
port_ptra pointer to store the port number in
paththe buffer for the path
path_sizethe size of the path buffer
urlthe URL to split

Definition at line 3567 of file utils.c.

Referenced by ff_udp_set_remote_url(), find_rtp_session_with_url(), gopher_open(), http_open_cnx(), mms_open(), mmsh_open(), resetup_tcp(), rtmp_open(), rtp_open(), rtp_set_remote_url(), rtsp_cmd_describe(), rtsp_cmd_setup(), sap_read_header(), sap_write_header(), tcp_open(), and udp_open().

int av_write_frame ( AVFormatContext s,
AVPacket pkt 
)

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.

Parameters:
smedia file handle
pktThe packet, which contains the stream_index, buf/buf_size, dts/pts, ...
Returns:
< 0 on error, = 0 if OK, 1 if end of stream wanted

Definition at line 3018 of file utils.c.

Referenced by ff_write_chained(), and http_prepare_data().

attribute_deprecated int av_write_header ( AVFormatContext s)

Allocate the stream private data and write the stream header to an output media file.

Note:
: this sets stream time-bases, if possible to stream->codec->time_base but for some formats it might also be some other time base
Parameters:
smedia file handle
Returns:
0 if OK, AVERROR_xxx on error
Deprecated:
use avformat_write_header.

Definition at line 2802 of file utils.c.

Referenced by main().

int av_write_trailer ( AVFormatContext s)

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.

Parameters:
smedia file handle
Returns:
0 if OK, AVERROR_xxx on error

Definition at line 3155 of file utils.c.

Referenced by close_connection(), ff_mov_close_hinting(), ff_rtsp_undo_setup(), http_prepare_data(), main(), and sap_write_close().

attribute_deprecated int avf_sdp_create ( AVFormatContext ac[],
int  n_files,
char *  buff,
int  size 
)

Definition at line 625 of file sdp.c.

AVFormatContext* avformat_alloc_context ( void  )
const char* avformat_configuration ( void  )

Return the libavformat build-time configuration.

Definition at line 58 of file utils.c.

void avformat_free_context ( AVFormatContext s)

Free an AVFormatContext and all its streams.

Parameters:
scontext to free
Examples:
libavformat/metadata-example.c.

Definition at line 2591 of file utils.c.

Referenced by av_close_input_stream(), avformat_open_input(), ff_mov_close_hinting(), ff_rtp_chain_mux_open(), ff_rtsp_undo_setup(), ffmpeg_exit(), main(), and sap_write_close().

const char* avformat_license ( void  )

Return the libavformat license.

Definition at line 63 of file utils.c.

int avformat_open_input ( AVFormatContext **  ps,
const char *  filename,
AVInputFormat fmt,
AVDictionary **  options 
)

Open an input stream and read the header.

The codecs are not opened. The stream must be closed with av_close_input_file().

Parameters:
psPointer to user-supplied AVFormatContext (allocated by avformat_alloc_context). May be a pointer to NULL, in which case an AVFormatContext is allocated by this function and written into ps. Note that a user-supplied AVFormatContext will be freed on failure.
filenameName of the stream to open.
fmtIf non-NULL, this parameter forces a specific input format. Otherwise the format is autodetected.
optionsA dictionary filled with AVFormatContext and demuxer-private options. On return this parameter will be destroyed and replaced with a dict containing options that were not found. May be NULL.
Returns:
0 on success, a negative AVERROR on failure.
Note:
If you want to use custom IO, preallocate the format context and set its pb field.
Examples:
libavformat/metadata-example.c.

Definition at line 595 of file utils.c.

Referenced by applehttp_read_header(), av_open_input_file(), av_open_input_stream(), build_feed_streams(), build_file_streams(), decode_thread(), ff_wms_parse_sdp_a_line(), http_receive_data(), main(), movie_init(), open_input_file(), open_input_stream(), opt_input_file(), rdt_new_context(), read_ffserver_streams(), read_gab2_sub(), and sap_read_header().

int avformat_seek_file ( AVFormatContext s,
int  stream_index,
int64_t  min_ts,
int64_t  ts,
int64_t  max_ts,
int  flags 
)

Seek to timestamp ts.

Seeking will be done so that the point from which all active streams can be presented successfully will be closest to ts and within min/max_ts. Active streams are all streams that have AVStream.discard < AVDISCARD_ALL.

If flags contain AVSEEK_FLAG_BYTE, then all timestamps are in bytes and are the file position (this may not be supported by all demuxers). If flags contain AVSEEK_FLAG_FRAME, then all timestamps are in frames in the stream with stream_index (this may not be supported by all demuxers). Otherwise all timestamps are in units of the stream selected by stream_index or if stream_index is -1, in AV_TIME_BASE units. If flags contain AVSEEK_FLAG_ANY, then non-keyframes are treated as keyframes (this may not be supported by all demuxers).

Parameters:
stream_indexindex of the stream which is used as time base reference
min_tssmallest acceptable timestamp
tstarget timestamp
max_tslargest acceptable timestamp
flagsflags
Returns:
>=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!

Definition at line 1774 of file utils.c.

Referenced by decode_thread(), main(), and seek_subtitle().

unsigned avformat_version ( void  )

Return the LIBAVFORMAT_VERSION_INT constant.

Definition at line 53 of file utils.c.

int avformat_write_header ( AVFormatContext s,
AVDictionary **  options 
)

Allocate the stream private data and write the stream header to an output media file.

Parameters:
sMedia 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.
optionsAn 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.
Returns:
0 on success, negative AVERROR on failure.
See also:
av_opt_find, av_dict_set, avio_open, av_oformat_next.

Definition at line 2808 of file utils.c.

Referenced by av_write_header(), build_feed_streams(), ff_rtp_chain_mux_open(), http_prepare_data(), rtp_new_av_stream(), and transcode().

attribute_deprecated void dump_format ( AVFormatContext ic,
int  index,
const char *  url,
int  is_output 
)

Definition at line 3300 of file utils.c.

Referenced by transcode().

attribute_deprecated int find_info_tag ( char *  arg,
int  arg_size,
const char *  tag1,
const char *  info 
)
Deprecated:
use av_find_info_tag in libavutil instead.

Definition at line 3414 of file utils.c.

attribute_deprecated int64_t parse_date ( const char *  datestr,
int  duration 
)

Parse datestr and return a corresponding number of microseconds.

Parameters:
datestrString representing a date or a duration. See av_parse_time() for the syntax of the provided string.
Deprecated:
in favor of av_parse_time()

Definition at line 3403 of file utils.c.