libavformat/utils.c File Reference

various utility functions for use within FFmpeg More...

#include "avformat.h"
#include "opt.h"
#include "avstring.h"
#include "riff.h"
#include <sys/time.h>
#include <time.h>
#include <assert.h>

Go to the source code of this file.

Defines

#define OFFSET(x)   offsetof(AVFormatContext,x)
#define DEFAULT   0
#define E   AV_OPT_FLAG_ENCODING_PARAM
#define D   AV_OPT_FLAG_DECODING_PARAM
#define PROBE_BUF_MIN   2048
 size of probe buffer, for guessing file type from file contents
#define PROBE_BUF_MAX   (1<<20)
#define DEBUG_SEEK
#define DURATION_MAX_READ_SIZE   250000
#define MAX_READ_SIZE   5000000
#define MAX_STD_TIMEBASES   (60*12+5)
#define PRINT(...)   do { if (!f) av_log(avcl, level, __VA_ARGS__); else fprintf(f, __VA_ARGS__); } while(0)
#define PRINT(...)   do { if (!f) av_log(avcl, level, __VA_ARGS__); else fprintf(f, __VA_ARGS__); } while(0)

Functions

static void av_frac_init (AVFrac *f, int64_t val, int64_t num, int64_t den)
 f = val + (num / den) + 0.5.
static void av_frac_add (AVFrac *f, int64_t incr)
 Fractional addition to f: f = f + (incr / f->den).
AVInputFormatav_iformat_next (AVInputFormat *f)
AVOutputFormatav_oformat_next (AVOutputFormat *f)
void av_register_input_format (AVInputFormat *format)
void av_register_output_format (AVOutputFormat *format)
int match_ext (const char *filename, const char *extensions)
AVOutputFormatguess_format (const char *short_name, const char *filename, const char *mime_type)
AVOutputFormatguess_stream_format (const char *short_name, const char *filename, const char *mime_type)
enum CodecID av_guess_codec (AVOutputFormat *fmt, const char *short_name, const char *filename, const char *mime_type, enum CodecType type)
 Guesses the codec id based upon muxer and filename.
AVInputFormatav_find_input_format (const char *short_name)
 finds AVInputFormat based on input format's short name.
void av_destruct_packet (AVPacket *pkt)
 Default packet destructor.
void av_init_packet (AVPacket *pkt)
 Initialize optional fields of a packet to default values.
int av_new_packet (AVPacket *pkt, int size)
 Allocate the payload of a packet and initialize its fields to default values.
int av_get_packet (ByteIOContext *s, AVPacket *pkt, int size)
 Allocate and read the payload of a packet and initialize its fields to default values.
int av_dup_packet (AVPacket *pkt)
int av_filename_number_test (const char *filename)
 Check whether filename actually is a numbered sequence generator.
static AVInputFormatav_probe_input_format2 (AVProbeData *pd, int is_opened, int *score_max)
AVInputFormatav_probe_input_format (AVProbeData *pd, int is_opened)
 Guess file format.
static const char * format_to_name (void *ptr)
 Open a media file from an IO stream.
static void avformat_get_context_defaults (AVFormatContext *s)
AVFormatContextav_alloc_format_context (void)
 Allocate an AVFormatContext.
int av_open_input_stream (AVFormatContext **ic_ptr, ByteIOContext *pb, const char *filename, AVInputFormat *fmt, AVFormatParameters *ap)
 Allocates all the structures needed to read an input stream.
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 av_read_packet (AVFormatContext *s, AVPacket *pkt)
 Read a transport packet from a media file.
static int get_audio_frame_size (AVCodecContext *enc, int size)
 Get the number of samples of an audio frame.
static void compute_frame_duration (int *pnum, int *pden, AVStream *st, AVCodecParserContext *pc, AVPacket *pkt)
 Return the frame duration in seconds.
static int is_intra_only (AVCodecContext *enc)
static void update_initial_timestamps (AVFormatContext *s, int stream_index, int64_t dts, int64_t pts)
static void compute_pkt_fields (AVFormatContext *s, AVStream *st, AVCodecParserContext *pc, AVPacket *pkt)
void av_destruct_packet_nofree (AVPacket *pkt)
static int av_read_frame_internal (AVFormatContext *s, AVPacket *pkt)
static AVPacketadd_to_pktbuf (AVFormatContext *s, AVPacket *pkt)
int av_read_frame (AVFormatContext *s, AVPacket *pkt)
 Return the next frame of a stream.
static void flush_packet_queue (AVFormatContext *s)
int av_find_default_stream_index (AVFormatContext *s)
static void av_read_frame_flush (AVFormatContext *s)
 Flush the frame reader.
void av_update_cur_dts (AVFormatContext *s, AVStream *ref_st, int64_t timestamp)
 Updates cur_dts of all streams based on given timestamp and AVStream.
void ff_reduce_index (AVFormatContext *s, int stream_index)
 Ensures the index uses less memory than the maximum specified in AVFormatContext.max_index_size, by discarding entries if it grows too large.
int av_add_index_entry (AVStream *st, int64_t pos, int64_t timestamp, int size, int distance, int flags)
 Add a index entry into a sorted list updateing if it is already there.
int av_index_search_timestamp (AVStream *st, int64_t wanted_timestamp, int flags)
 Gets the index for a specific timestamp.
int av_seek_frame_binary (AVFormatContext *s, int stream_index, int64_t target_ts, int flags)
 Does a binary search using av_index_search_timestamp() and AVCodec.read_timestamp().
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))
 Does a binary search using read_timestamp().
static int av_seek_frame_byte (AVFormatContext *s, int stream_index, int64_t pos, int flags)
static int av_seek_frame_generic (AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
int av_seek_frame (AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
 Seek to the key frame at timestamp.
static int av_has_duration (AVFormatContext *ic)
 Returns TRUE if the stream has accurate duration in any stream.
static void av_update_stream_timings (AVFormatContext *ic)
 Estimate the stream timings from the one of each components.
static void fill_all_stream_timings (AVFormatContext *ic)
static void av_estimate_timings_from_bit_rate (AVFormatContext *ic)
static void av_estimate_timings_from_pts (AVFormatContext *ic, offset_t old_offset)
static void av_estimate_timings (AVFormatContext *ic, offset_t old_offset)
static int has_codec_parameters (AVCodecContext *enc)
static int try_decode_frame (AVStream *st, const uint8_t *data, int size)
static int set_codec_from_probe_data (AVStream *st, AVProbeData *pd, int score)
unsigned int codec_get_tag (const AVCodecTag *tags, int id)
enum CodecID codec_get_id (const AVCodecTag *tags, unsigned int tag)
unsigned int av_codec_get_tag (const AVCodecTag *tags[4], enum CodecID id)
enum CodecID av_codec_get_id (const AVCodecTag *tags[4], unsigned int tag)
static int get_std_framerate (int i)
static int tb_unreliable (AVCodecContext *c)
int av_find_stream_info (AVFormatContext *ic)
 Read packets of a media file to get stream information.
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).
AVStreamav_new_stream (AVFormatContext *s, int id)
 Add a new stream to a media file.
AVProgramav_new_program (AVFormatContext *ac, int id)
void av_set_program_name (AVProgram *program, char *provider_name, char *name)
int av_set_parameters (AVFormatContext *s, AVFormatParameters *ap)
 media file output
int av_write_header (AVFormatContext *s)
 Allocate the stream private data and write the stream header to an output media file.
static int compute_pkt_fields2 (AVStream *st, AVPacket *pkt)
static void truncate_ts (AVStream *st, AVPacket *pkt)
int av_write_frame (AVFormatContext *s, AVPacket *pkt)
 Write a packet to an output media file.
int av_interleave_packet_per_dts (AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush)
 Interleave a packet per DTS in an output media file.
static int av_interleave_packet (AVFormatContext *s, AVPacket *out, AVPacket *in, int flush)
 Interleaves an AVPacket correctly so it can be muxed.
int av_interleaved_write_frame (AVFormatContext *s, AVPacket *pkt)
 Writes a packet to an output media file ensuring correct interleaving.
int av_write_trailer (AVFormatContext *s)
 Write the stream trailer to an output media file and free the file private data.
void av_program_add_stream_index (AVFormatContext *ac, int progid, unsigned int idx)
static void dump_stream_format (AVFormatContext *ic, int i, int index, int is_output)
void dump_format (AVFormatContext *ic, int index, const char *url, int is_output)
int parse_image_size (int *width_ptr, int *height_ptr, const char *str)
 parses width and height out of string str.
int parse_frame_rate (int *frame_rate_num, int *frame_rate_den, const char *arg)
 Converts frame rate from string to a fraction.
int64_t av_gettime (void)
 Gets the current time in microseconds.
int64_t parse_date (const char *datestr, int duration)
 Parses datestr and returns a corresponding number of microseconds.
int find_info_tag (char *arg, int arg_size, const char *tag1, const char *info)
 Attempts to find a specific tag in a URL.
int av_get_frame_filename (char *buf, int buf_size, const char *path, int number)
 Returns in 'buf' the path with 'd' replaced by number.
static void hex_dump_internal (void *avcl, FILE *f, int level, uint8_t *buf, int size)
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.
static void pkt_dump_internal (void *avcl, FILE *f, int level, AVPacket *pkt, int dump_payload)
void av_pkt_dump (FILE *f, AVPacket *pkt, int dump_payload)
 Send a nice dump of a packet to the specified file stream.
void av_pkt_dump_log (void *avcl, int level, AVPacket *pkt, int dump_payload)
 Send a nice dump of a packet to the log.
void 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)
void av_set_pts_info (AVStream *s, int pts_wrap_bits, int pts_num, int pts_den)
 Set the pts for a given stream.

Variables

AVInputFormatfirst_iformat = NULL
 head of registered input format linked list
AVOutputFormatfirst_oformat = NULL
 head of registered output format linked list
static const AVOption options []
static const AVClass av_format_context_class = { "AVFormatContext", format_to_name, options }


Detailed Description

various utility functions for use within FFmpeg

Definition in file utils.c.


Define Documentation

#define D   AV_OPT_FLAG_DECODING_PARAM

Definition at line 313 of file utils.c.

#define DEBUG_SEEK

Definition at line 1102 of file utils.c.

#define DEFAULT   0

Definition at line 310 of file utils.c.

#define DURATION_MAX_READ_SIZE   250000

Definition at line 1512 of file utils.c.

Referenced by av_estimate_timings_from_pts().

#define E   AV_OPT_FLAG_ENCODING_PARAM

Definition at line 312 of file utils.c.

#define MAX_READ_SIZE   5000000

Definition at line 1773 of file utils.c.

#define MAX_STD_TIMEBASES   (60*12+5)

Definition at line 1775 of file utils.c.

Referenced by av_find_stream_info().

#define OFFSET (  )     offsetof(AVFormatContext,x)

Definition at line 309 of file utils.c.

#define PRINT ( ...   )     do { if (!f) av_log(avcl, level, __VA_ARGS__); else fprintf(f, __VA_ARGS__); } while(0)

#define PRINT ( ...   )     do { if (!f) av_log(avcl, level, __VA_ARGS__); else fprintf(f, __VA_ARGS__); } while(0)

#define PROBE_BUF_MAX   (1<<20)

Definition at line 413 of file utils.c.

Referenced by av_open_input_file().

#define PROBE_BUF_MIN   2048

size of probe buffer, for guessing file type from file contents

Definition at line 412 of file utils.c.

Referenced by av_open_input_file().


Function Documentation

static AVPacket* add_to_pktbuf ( AVFormatContext s,
AVPacket pkt 
) [static]

Definition at line 865 of file utils.c.

Referenced by av_find_stream_info(), and av_read_frame().

int av_add_index_entry ( AVStream st,
int64_t  pos,
int64_t  timestamp,
int  size,
int  distance,
int  flags 
)

AVFormatContext* av_alloc_format_context ( void   ) 

Allocate an AVFormatContext.

Can be freed with av_free() but do not forget to free everything you explicitly allocated as well!

Definition at line 345 of file utils.c.

Referenced by av_open_input_stream(), main(), mov_read_stsd(), opt_input_file(), opt_output_file(), prepare_sdp_description(), and rtp_new_av_stream().

void av_close_input_file ( AVFormatContext s  ) 

Close a media file (but not its codecs).

Parameters:
s media file handle

Definition at line 2129 of file utils.c.

Referenced by av_exit(), build_feed_streams(), build_file_streams(), close_connection(), decode_thread(), get_watermark_picture(), http_prepare_data(), and read_ffserver_streams().

void av_close_input_stream ( AVFormatContext s  ) 

Free a AVFormatContext allocated by av_open_input_stream.

Parameters:
s context to free

Definition at line 2095 of file utils.c.

Referenced by av_close_input_file().

enum CodecID av_codec_get_id ( const AVCodecTag tags[4],
unsigned int  tag 
)

Definition at line 1762 of file utils.c.

unsigned int av_codec_get_tag ( const AVCodecTag tags[4],
enum CodecID  id 
)

Definition at line 1752 of file utils.c.

void av_destruct_packet ( AVPacket pkt  ) 

Default packet destructor.

Definition at line 188 of file utils.c.

Referenced by av_dup_packet(), av_interleave_packet_per_dts(), av_new_packet(), ogg_interleave_per_granule(), output_packet(), and write_frame().

void av_destruct_packet_nofree ( AVPacket pkt  ) 

Definition at line 750 of file utils.c.

Referenced by av_init_packet(), and av_read_frame_internal().

int av_dup_packet ( AVPacket pkt  ) 

Warning:
This is a hack - the packet memory allocation stuff is broken. The packet is allocated if it was not really allocated

Definition at line 240 of file utils.c.

Referenced by av_find_stream_info(), av_interleave_packet_per_dts(), av_read_frame(), ogg_interleave_per_granule(), and packet_queue_put().

static void av_estimate_timings ( AVFormatContext ic,
offset_t  old_offset 
) [static]

Definition at line 1608 of file utils.c.

Referenced by av_find_stream_info().

static void av_estimate_timings_from_bit_rate ( AVFormatContext ic  )  [static]

Definition at line 1480 of file utils.c.

Referenced by av_estimate_timings().

static void av_estimate_timings_from_pts ( AVFormatContext ic,
offset_t  old_offset 
) [static]

Definition at line 1515 of file utils.c.

Referenced by av_estimate_timings().

int av_filename_number_test ( const char *  filename  ) 

Check whether filename actually is a numbered sequence generator.

Parameters:
filename possible numbered sequence string
Returns:
1 if a valid numbered sequence string, 0 otherwise.

Definition at line 259 of file utils.c.

Referenced by av_open_input_file(), guess_format(), image_probe(), and opt_output_file().

int av_find_default_stream_index ( AVFormatContext s  ) 

Definition at line 952 of file utils.c.

Referenced by av_seek_frame().

AVInputFormat* av_find_input_format ( const char *  short_name  ) 

finds AVInputFormat based on input format's short name.

Definition at line 176 of file utils.c.

Referenced by get_watermark_picture(), http_receive_data(), opt_format(), and parse_ffconfig().

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 frame rate in case of mpeg2 repeat frame mode. The logical file position is not changed by this function; examined packets may be buffered for later processing.

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

Definition at line 1799 of file utils.c.

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

static void av_frac_add ( AVFrac f,
int64_t  incr 
) [static]

Fractional addition to f: f = f + (incr / f->den).

Parameters:
f fractional number
incr increment, can be positive or negative

Definition at line 3054 of file utils.c.

Referenced by compute_pkt_fields2().

static void av_frac_init ( AVFrac f,
int64_t  val,
int64_t  num,
int64_t  den 
) [static]

f = val + (num / den) + 0.5.

'num' is normalized so that it is such as 0 <= num < den.

Parameters:
f fractional number
val integer value
num must be >= 0
den must be >= 1

Definition at line 3036 of file utils.c.

Referenced by av_write_header().

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 
)

Does a binary search using read_timestamp().

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

Parameters:
target_ts target timestamp in the time base of the given stream
stream_index stream number

Definition at line 1168 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 
)

Returns in 'buf' the path with 'd' replaced by number.

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

Parameters:
buf destination buffer
buf_size destination buffer size
path numbered sequence string
number frame number
Returns:
0 if OK, -1 if format error.

Definition at line 2826 of file utils.c.

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

int av_get_packet ( ByteIOContext 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 CodecType  type 
)

Guesses the codec id based upon muxer and filename.

Definition at line 157 of file utils.c.

Referenced by new_audio_stream(), and new_video_stream().

static int av_has_duration ( AVFormatContext ic  )  [static]

Returns TRUE if the stream has accurate duration in any stream.

Returns:
TRUE if the stream has accurate duration for at least one component.

Definition at line 1399 of file utils.c.

Referenced by av_estimate_timings().

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:
f The file stream pointer where the dump should be sent to.
buf buffer
size buffer size
See also:
av_hex_dump_log, av_pkt_dump, av_pkt_dump_log

Definition at line 2909 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:
avcl A pointer to an arbitrary struct of which the first field is a pointer to an AVClass struct.
level The importance level of the message, lower values signifying higher importance.
buf buffer
size buffer size
See also:
av_hex_dump, av_pkt_dump, av_pkt_dump_log

Definition at line 2914 of file utils.c.

Referenced by mpegts_push_data(), pat_cb(), pmt_cb(), and sdt_cb().

AVInputFormat* av_iformat_next ( AVInputFormat f  ) 

Definition at line 44 of file utils.c.

Referenced by opt_show_formats().

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

Gets the index for a specific timestamp.

Parameters:
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 >= if AVSEEK_FLAG_ANY seek to any frame, only keyframes otherwise
Returns:
< 0 if no such timestamp could be found

Definition at line 1070 of file utils.c.

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

void av_init_packet ( AVPacket pkt  ) 

static int av_interleave_packet ( AVFormatContext s,
AVPacket out,
AVPacket in,
int  flush 
) [static]

Interleaves an AVPacket correctly so it can be muxed.

Parameters:
out the interleaved packet will be output here
in the input packet
flush 1 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 occured

Definition at line 2466 of file utils.c.

Referenced by av_interleaved_write_frame(), and av_write_trailer().

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 calling av_free_packet() on them is still safe.

Parameters:
s media file handle
out the interleaved packet will be output here
in the input packet
flush 1 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 occured

Definition at line 2404 of file utils.c.

Referenced by av_interleave_packet(), and gxf_interleave_packet().

int av_interleaved_write_frame ( AVFormatContext s,
AVPacket pkt 
)

Writes 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:
s media file handle
pkt the packet, which contains the stream_index, buf/buf_size, dts/pts, ...
Returns:
< 0 if error, = 0 if OK, 1 if end of stream wanted.

Definition at line 2473 of file utils.c.

Referenced by write_frame().

int av_new_packet ( AVPacket pkt,
int  size 
)

AVProgram* av_new_program ( AVFormatContext ac,
int  id 
)

Definition at line 2171 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:
s media file handle
id file format dependent stream id

Definition at line 2137 of file utils.c.

Referenced by aac_read_header(), ac3_read_header(), add_audio_stream(), add_video_stream(), aiff_read_header(), amr_read_header(), apc_read_header(), ape_read_header(), asf_read_header(), au_read_header(), audio_read_header(), avi_read_header(), avisynth_read_header(), avs_read_packet(), cdata_read_header(), cin_read_header(), create_audio_stream(), create_stream(), daud_header(), dc1394_read_common(), decode_main_header(), dts_read_header(), dv_extract_audio_info(), dv_init_demux(), dxa_read_header(), ea_read_header(), ffm_read_header(), film_read_header(), flac_read_header(), flic_read_header(), fourxm_read_header(), get_sindex(), gif_read_header(), grab_read_header(), idcin_read_header(), img_read_header(), ipmovie_read_header(), lmlm4_read_header(), matroska_parse_attachments(), matroska_read_header(), mm_read_header(), mmf_read_header(), mov_read_trak(), mp3_read_header(), mpc8_read_header(), mpc_read_header(), mpegps_read_packet(), mpegts_read_header(), mtv_read_header(), mxf_parse_structural_metadata(), new_audio_stream(), new_pes_av_stream(), new_subtitle_stream(), new_video_stream(), nsv_parse_NSVs_header(), nut_read_header(), nuv_header(), ogg_new_stream(), pva_read_header(), raw_read_header(), read_header(), read_packet(), rm_read_header(), rm_read_header_old(), roq_read_header(), sdp_parse_line(), seq_read_header(), shorten_read_header(), siff_parse_vbv1(), smacker_read_header(), sol_read_header(), str_read_header(), swf_read_packet(), thp_read_header(), tta_read_header(), txd_read_header(), v4l2_read_header(), vc1t_read_header(), vid_read_header(), video_read_header(), vmd_read_header(), voc_read_header(), wav_read_header(), wc3_read_header(), wsaud_read_header(), wsvqa_read_header(), wv_read_header(), x11grab_read_header(), and yuv4_read_header().

AVOutputFormat* av_oformat_next ( AVOutputFormat f  ) 

Definition at line 50 of file utils.c.

Referenced by opt_show_formats().

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_ptr the opened media file handle is put here
filename filename to open.
fmt if non NULL, force the file format to use
buf_size optional buffer size (zero if default is OK)
ap additional parameters needed when opening the file (NULL if default)
Returns:
0 if OK. AVERROR_xxx otherwise.

Definition at line 415 of file utils.c.

Referenced by build_feed_streams(), build_file_streams(), decode_thread(), get_watermark_picture(), main(), open_input_stream(), opt_input_file(), and read_ffserver_streams().

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

Allocates all the structures needed to read an input stream.

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

Definition at line 355 of file utils.c.

Referenced by av_open_input_file().

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

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

Parameters:
f The file stream pointer where the dump should be sent to.
pkt packet to dump
dump_payload true if the payload must be displayed too

Definition at line 2945 of file utils.c.

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

Send a nice dump of a packet to the log.

Parameters:
avcl A pointer to an arbitrary struct of which the first field is a pointer to an AVClass struct.
level The importance level of the message, lower values signifying higher importance.
pkt packet to dump
dump_payload true if the payload must be displayed too

Definition at line 2950 of file utils.c.

Referenced by av_encode().

AVInputFormat* av_probe_input_format ( AVProbeData pd,
int  is_opened 
)

Guess file format.

Parameters:
is_opened whether the file is already opened, determines whether demuxers with or without AVFMT_NOFILE are probed

Definition at line 290 of file utils.c.

Referenced by av_open_input_file().

static AVInputFormat* av_probe_input_format2 ( AVProbeData pd,
int  is_opened,
int *  score_max 
) [static]

Definition at line 265 of file utils.c.

Referenced by av_open_input_file(), av_probe_input_format(), and set_codec_from_probe_data().

void av_program_add_stream_index ( AVFormatContext ac,
int  progid,
unsigned int  idx 
)

Definition at line 2540 of file utils.c.

Referenced by pmt_cb().

int av_read_frame ( AVFormatContext s,
AVPacket pkt 
)

Return the next frame of a stream.

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.timebase units (and guessed if the format cannot provided 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 if error or end of file.

Definition at line 881 of file utils.c.

Referenced by asf_read_pts(), av_encode(), av_seek_frame_generic(), decode_thread(), get_watermark_picture(), http_prepare_data(), main(), mpc_read_seek(), and wv_read_seek().

static void av_read_frame_flush ( AVFormatContext s  )  [static]

Flush the frame reader.

Definition at line 971 of file utils.c.

Referenced by av_find_stream_info(), av_seek_frame(), and av_seek_frame_generic().

static int av_read_frame_internal ( AVFormatContext s,
AVPacket pkt 
) [static]

Definition at line 755 of file utils.c.

Referenced by av_find_stream_info(), and av_read_frame().

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:
s media file handle
pkt is filled
Returns:
0 if OK. AVERROR_xxx if error.

Definition at line 494 of file utils.c.

Referenced by av_estimate_timings_from_pts(), av_read_frame_internal(), and extract_mpeg4_header().

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 2086 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 2077 of file utils.c.

Referenced by decode_thread().

void av_register_input_format ( AVInputFormat format  ) 

Definition at line 56 of file utils.c.

Referenced by audio_init().

void av_register_output_format ( AVOutputFormat format  ) 

Definition at line 65 of file utils.c.

Referenced by audio_init().

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

Seek to the key frame at timestamp.

'timestamp' in 'stream_index'.

Parameters:
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.
timestamp timestamp in AVStream.time_base units or if there is no stream specified then in AV_TIME_BASE units
flags flags which select direction and seeking mode
Returns:
>= 0 on success

Definition at line 1356 of file utils.c.

Referenced by av_find_stream_info(), decode_thread(), main(), opt_input_file(), and rtsp_cmd_play().

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

Does a binary search using av_index_search_timestamp() and AVCodec.read_timestamp().

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

Parameters:
target_ts target timestamp in the time base of the given stream
stream_index stream number

Definition at line 1104 of file utils.c.

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

static int av_seek_frame_byte ( AVFormatContext s,
int  stream_index,
int64_t  pos,
int  flags 
) [static]

Definition at line 1281 of file utils.c.

Referenced by av_seek_frame().

static int av_seek_frame_generic ( AVFormatContext s,
int  stream_index,
int64_t  timestamp,
int  flags 
) [static]

Definition at line 1306 of file utils.c.

Referenced by av_seek_frame().

int av_set_parameters ( AVFormatContext s,
AVFormatParameters ap 
)

media file output

Definition at line 2211 of file utils.c.

Referenced by build_feed_streams(), http_prepare_data(), main(), opt_output_file(), and rtp_new_av_stream().

void av_set_program_name ( AVProgram program,
char *  provider_name,
char *  name 
)

Definition at line 2196 of file utils.c.

Referenced by sdt_cb().

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

Set the pts for a given stream.

Parameters:
s stream
pts_wrap_bits number of bits effectively used by the pts (used for wrap control, 33 is the value for MPEG)
pts_num numerator to convert to seconds (MPEG: 1)
pts_den denominator to convert to seconds (MPEG: 90000)

Definition at line 3016 of file utils.c.

Referenced by add_av_stream1(), aiff_read_header(), amr_read_header(), ape_read_header(), asf_read_header(), asf_write_header1(), au_read_header(), audio_read_header(), av_new_stream(), avi_read_header(), avisynth_read_header(), cdata_read_header(), cin_read_header(), create_audio_stream(), create_stream(), dc1394_read_common(), decode_stream_header(), dv_extract_audio_info(), dv_extract_video_info(), dxa_read_header(), ea_read_header(), ffm_read_header(), film_read_header(), flic_read_header(), flv_write_header(), fourxm_read_header(), grab_read_header(), gxf_header(), gxf_write_header(), idcin_read_header(), img_read_header(), ipmovie_read_header(), lmlm4_read_header(), matroska_read_header(), mkv_write_tracks(), mm_read_header(), mmf_read_header(), mov_read_header(), mov_write_header(), mpc8_read_header(), mpc_read_header(), mpeg_mux_init(), mpegts_read_header(), mtv_read_header(), mxf_parse_structural_metadata(), new_pes_av_stream(), nsv_parse_NSVs_header(), nut_read_header(), nuv_header(), ogg_new_stream(), ogg_write_header(), parse_h264_sdp_line(), pva_read_header(), raw_read_header(), rm_read_header(), roq_read_header(), rtp_write_header(), seq_read_header(), siff_parse_vbv1(), smacker_read_header(), sol_read_header(), str_read_header(), swf_read_packet(), thp_read_header(), tta_read_header(), v4l2_read_header(), vc1t_read_header(), vid_read_header(), video_read_header(), vmd_read_header(), wav_read_header(), wc3_read_header(), write_header(), wsaud_read_header(), wsvqa_read_header(), wv_read_header(), x11grab_read_header(), and yuv4_read_header().

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

Updates cur_dts of all streams based on given timestamp and AVStream.

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

Parameters:
timestamp new dts expressed in time_base of param ref_st
ref_st reference stream giving time_base of param timestamp

Definition at line 1001 of file utils.c.

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

static void av_update_stream_timings ( AVFormatContext ic  )  [static]

Estimate the stream timings from the one of each components.

Also computes the global bitrate if possible.

Definition at line 1417 of file utils.c.

Referenced by av_estimate_timings(), and fill_all_stream_timings().

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:
s media file handle
pkt the packet, which contains the stream_index, buf/buf_size, dts/pts, ...
Returns:
< 0 if error, = 0 if OK, 1 if end of stream wanted.

Definition at line 2388 of file utils.c.

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

int av_write_header ( AVFormatContext s  ) 

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

Parameters:
s media file handle
Returns:
0 if OK. AVERROR_xxx if error.

Definition at line 2230 of file utils.c.

Referenced by av_encode(), build_feed_streams(), http_prepare_data(), main(), and rtp_new_av_stream().

int av_write_trailer ( AVFormatContext s  ) 

Write the stream trailer to an output media file and free the file private data.

Parameters:
s media file handle
Returns:
0 if OK. AVERROR_xxx if error.

Definition at line 2506 of file utils.c.

Referenced by av_encode(), close_connection(), http_prepare_data(), and main().

static void avformat_get_context_defaults ( AVFormatContext s  )  [static]

Definition at line 336 of file utils.c.

Referenced by av_alloc_format_context().

enum CodecID codec_get_id ( const AVCodecTag tags,
unsigned int  tag 
)

unsigned int codec_get_tag ( const AVCodecTag tags,
int  id 
)

static void compute_frame_duration ( int *  pnum,
int *  pden,
AVStream st,
AVCodecParserContext pc,
AVPacket pkt 
) [static]

Return the frame duration in seconds.

Return 0 if not available.

Definition at line 551 of file utils.c.

Referenced by compute_pkt_fields(), and compute_pkt_fields2().

static void compute_pkt_fields ( AVFormatContext s,
AVStream st,
AVCodecParserContext pc,
AVPacket pkt 
) [static]

Definition at line 635 of file utils.c.

Referenced by av_read_frame_internal().

static int compute_pkt_fields2 ( AVStream st,
AVPacket pkt 
) [static]

Definition at line 2307 of file utils.c.

Referenced by av_interleaved_write_frame(), and av_write_frame().

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

Definition at line 2591 of file utils.c.

Referenced by av_encode(), decode_thread(), main(), and opt_input_file().

static void dump_stream_format ( AVFormatContext ic,
int  i,
int  index,
int  is_output 
) [static]

Definition at line 2564 of file utils.c.

Referenced by dump_format().

void ff_reduce_index ( AVFormatContext s,
int  stream_index 
)

Ensures the index uses less memory than the maximum specified in AVFormatContext.max_index_size, by discarding entries if it grows too large.

This function is not part of the public API and should only be called by demuxers.

Definition at line 1013 of file utils.c.

Referenced by av_read_frame_internal(), and mpegps_read_pes_header().

static void fill_all_stream_timings ( AVFormatContext ic  )  [static]

Definition at line 1463 of file utils.c.

Referenced by av_estimate_timings(), and av_estimate_timings_from_pts().

int find_info_tag ( char *  arg,
int  arg_size,
const char *  tag1,
const char *  info 
)

Attempts to find a specific tag in a URL.

syntax: '?tag1=val1&tag2=val2...'. Little URL decoding is done. Return 1 if found.

Definition at line 2787 of file utils.c.

Referenced by open_input_stream(), rtp_open(), and udp_open().

static void flush_packet_queue ( AVFormatContext s  )  [static]

static const char* format_to_name ( void *  ptr  )  [static]

Open a media file from an IO stream.

'fmt' must be specified.

Definition at line 301 of file utils.c.

static int get_audio_frame_size ( AVCodecContext enc,
int  size 
) [static]

Get the number of samples of an audio frame.

Return -1 on error.

Definition at line 524 of file utils.c.

Referenced by compute_frame_duration(), and compute_pkt_fields2().

static int get_std_framerate ( int  i  )  [static]

Definition at line 1776 of file utils.c.

Referenced by av_find_stream_info().

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

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

Definition at line 138 of file utils.c.

Referenced by parse_ffconfig().

static int has_codec_parameters ( AVCodecContext enc  )  [static]

Definition at line 1655 of file utils.c.

Referenced by av_find_stream_info(), and try_decode_frame().

static void hex_dump_internal ( void *  avcl,
FILE *  f,
int  level,
uint8_t buf,
int  size 
) [static]

Definition at line 2881 of file utils.c.

Referenced by av_hex_dump(), and av_hex_dump_log().

static int is_intra_only ( AVCodecContext enc  )  [static]

Definition at line 584 of file utils.c.

Referenced by compute_pkt_fields().

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

int64_t parse_date ( const char *  datestr,
int  duration 
)

Parses datestr and returns a corresponding number of microseconds.

Parameters:
datestr String representing a date or a duration.
  • If a date the syntax is:
      [{YYYY-MM-DD|YYYYMMDD}]{T| }{HH[:MM[:SS[.m...]]][Z]|HH[MM[SS[.m...]]][Z]}
    
    Time is localtime unless Z is appended, in which case it is interpreted as UTC. If the year-month-day part isn't specified it takes the current year-month-day. Returns the number of microseconds since 1st of January, 1970 up to the time of the parsed date or INT64_MIN if datestr cannot be successfully parsed.
  • If a duration the syntax is:
      [-]HH[:MM[:SS[.m...]]]
      [-]S+[.m...]
    
    Returns the number of microseconds contained in a time interval with the specified duration or INT64_MIN if datestr cannot be successfully parsed.
duration Flag which tells how to interpret datestr, if not zero datestr is interpreted as a duration, otherwise as a date.

Definition at line 2671 of file utils.c.

Referenced by open_input_stream(), opt_seek(), parse_time_or_die(), and rtsp_parse_range_npt().

int parse_frame_rate ( int *  frame_rate,
int *  frame_rate_base,
const char *  arg 
)

Converts frame rate from string to a fraction.

Deprecated:
Use av_parse_video_frame_rate instead.

Definition at line 2652 of file utils.c.

int parse_image_size ( int *  width_ptr,
int *  height_ptr,
const char *  str 
)

parses width and height out of string str.

Deprecated:
Use av_parse_video_frame_size instead.

Definition at line 2647 of file utils.c.

static void pkt_dump_internal ( void *  avcl,
FILE *  f,
int  level,
AVPacket pkt,
int  dump_payload 
) [static]

Definition at line 2920 of file utils.c.

Referenced by av_pkt_dump(), and av_pkt_dump_log().

static int set_codec_from_probe_data ( AVStream st,
AVProbeData pd,
int  score 
) [static]

Definition at line 1711 of file utils.c.

Referenced by av_find_stream_info().

static int tb_unreliable ( AVCodecContext c  )  [static]

Definition at line 1789 of file utils.c.

Referenced by av_find_stream_info().

static void truncate_ts ( AVStream st,
AVPacket pkt 
) [static]

Definition at line 2376 of file utils.c.

Referenced by av_interleaved_write_frame(), av_write_frame(), and av_write_trailer().

static int try_decode_frame ( AVStream st,
const uint8_t data,
int  size 
) [static]

Definition at line 1672 of file utils.c.

Referenced by av_find_stream_info().

static void update_initial_timestamps ( AVFormatContext s,
int  stream_index,
int64_t  dts,
int64_t  pts 
) [static]

Definition at line 606 of file utils.c.

Referenced by compute_pkt_fields().

void 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 
)


Variable Documentation

const AVClass av_format_context_class = { "AVFormatContext", format_to_name, options } [static]

Definition at line 334 of file utils.c.

head of registered input format linked list

Definition at line 40 of file utils.c.

head of registered output format linked list

Definition at line 42 of file utils.c.

const AVOption options[] [static]

Initial value:

{
{"probesize", NULL, OFFSET(probesize), FF_OPT_TYPE_INT, 32000, 32, INT_MAX, D}, 
{"muxrate", "set mux rate", OFFSET(mux_rate), FF_OPT_TYPE_INT, DEFAULT, 0, INT_MAX, E},
{"packetsize", "set packet size", OFFSET(packet_size), FF_OPT_TYPE_INT, DEFAULT, 0, INT_MAX, E},
{"fflags", NULL, OFFSET(flags), FF_OPT_TYPE_FLAGS, DEFAULT, INT_MIN, INT_MAX, D|E, "fflags"},
{"ignidx", "ignore index", 0, FF_OPT_TYPE_CONST, AVFMT_FLAG_IGNIDX, INT_MIN, INT_MAX, D, "fflags"},
{"genpts", "generate pts", 0, FF_OPT_TYPE_CONST, AVFMT_FLAG_GENPTS, INT_MIN, INT_MAX, D, "fflags"},
{"track", " set the track number", OFFSET(track), FF_OPT_TYPE_INT, DEFAULT, 0, INT_MAX, E},
{"year", "set the year", OFFSET(year), FF_OPT_TYPE_INT, DEFAULT, INT_MIN, INT_MAX, E},
{"analyzeduration", "how many microseconds are analyzed to estimate duration", OFFSET(max_analyze_duration), FF_OPT_TYPE_INT, 3*AV_TIME_BASE, 0, INT_MAX, D},
{"cryptokey", "decryption key", OFFSET(key), FF_OPT_TYPE_BINARY, 0, 0, 0, D},
{"indexmem", "max memory used for timestamp index (per stream)", OFFSET(max_index_size), FF_OPT_TYPE_INT, INT_MAX, 0, INT_MAX, D},
{NULL},
}

Definition at line 315 of file utils.c.


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