libavformat/utils.c File Reference

various utility functions for use within FFmpeg More...

#include "avformat.h"
#include "avio_internal.h"
#include "internal.h"
#include "libavcodec/internal.h"
#include "libavcodec/raw.h"
#include "libavcodec/bytestream.h"
#include "libavutil/avassert.h"
#include "libavutil/opt.h"
#include "libavutil/dict.h"
#include "libavutil/pixdesc.h"
#include "metadata.h"
#include "id3v2.h"
#include "libavutil/avstring.h"
#include "libavutil/mathematics.h"
#include "libavutil/parseutils.h"
#include "riff.h"
#include "audiointerleave.h"
#include "url.h"
#include <sys/time.h>
#include <time.h>
#include <stdarg.h>
#include <assert.h>

Go to the source code of this file.

Defines

#define LICENSE_PREFIX   "libavformat license: "
#define PROBE_BUF_MIN   2048
 size of probe buffer, for guessing file type from file contents
#define PROBE_BUF_MAX   (1<<20)
#define DURATION_MAX_READ_SIZE   250000
#define DURATION_MAX_RETRY   3
#define CHUNK_START   0x1000
#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

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.
static void frac_init (AVFrac *f, int64_t val, int64_t num, int64_t den)
 f = val + (num / den) + 0.5.
static void frac_add (AVFrac *f, int64_t incr)
 Fractional addition to f: f = f + (incr / f->den).
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.
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.
void av_register_input_format (AVInputFormat *format)
void av_register_output_format (AVOutputFormat *format)
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.
static int match_format (const char *name, const char *names)
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.
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.
AVInputFormat * av_find_input_format (const char *short_name)
 Find AVInputFormat based on the short name of the input format.
int ffio_limit (AVIOContext *s, int size)
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.
int av_filename_number_test (const char *filename)
 Check whether filename actually is a numbered sequence generator.
AVInputFormat * av_probe_input_format3 (AVProbeData *pd, int is_opened, int *score_ret)
 Guess the file format.
AVInputFormat * av_probe_input_format2 (AVProbeData *pd, int is_opened, int *score_max)
 Guess the file format.
AVInputFormat * av_probe_input_format (AVProbeData *pd, int is_opened)
 Guess the file format.
static int set_codec_from_probe_data (AVFormatContext *s, AVStream *st, AVProbeData *pd)
static AVDictionary * convert_format_parameters (AVFormatParameters *ap)
int av_open_input_stream (AVFormatContext **ic_ptr, AVIOContext *pb, const char *filename, AVInputFormat *fmt, AVFormatParameters *ap)
 Open a media file from an IO stream.
int av_demuxer_open (AVFormatContext *ic, AVFormatParameters *ap)
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.
int av_open_input_file (AVFormatContext **ic_ptr, const char *filename, AVInputFormat *fmt, int buf_size, AVFormatParameters *ap)
 Open a media file as input.
static int init_input (AVFormatContext *s, const char *filename, AVDictionary **options)
int avformat_open_input (AVFormatContext **ps, const char *filename, AVInputFormat *fmt, AVDictionary **options)
 Open an input stream and read the header.
static AVPacket * add_to_pktbuf (AVPacketList **packet_buffer, AVPacket *pkt, AVPacketList **plast_pktl)
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 update_initial_durations (AVFormatContext *s, AVStream *st, AVPacket *pkt)
static void compute_pkt_fields (AVFormatContext *s, AVStream *st, AVCodecParserContext *pc, AVPacket *pkt)
static int read_frame_internal (AVFormatContext *s, AVPacket *pkt)
static int read_from_packet_buffer (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)
void ff_read_frame_flush (AVFormatContext *s)
 Flush the frame reader.
void av_update_cur_dts (AVFormatContext *s, AVStream *ref_st, int64_t timestamp)
void ff_update_cur_dts (AVFormatContext *s, AVStream *ref_st, int64_t timestamp)
 Update cur_dts of all streams based on the given timestamp and AVStream.
void ff_reduce_index (AVFormatContext *s, int stream_index)
 Ensure the index uses less memory than the maximum specified in AVFormatContext.max_index_size by discarding entries if it grows too large.
int ff_add_index_entry (AVIndexEntry **index_entries, int *nb_index_entries, unsigned int *index_entries_allocated_size, int64_t pos, int64_t timestamp, int size, int distance, int flags)
 Internal version of av_add_index_entry.
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 ff_index_search_timestamp (const AVIndexEntry *entries, int nb_entries, int64_t wanted_timestamp, int flags)
 Internal version of av_index_search_timestamp.
int av_index_search_timestamp (AVStream *st, int64_t wanted_timestamp, int flags)
 Get the index for a specific timestamp.
int av_seek_frame_binary (AVFormatContext *s, int stream_index, int64_t target_ts, int flags)
int ff_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().
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))
int64_t ff_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().
static int seek_frame_byte (AVFormatContext *s, int stream_index, int64_t pos, int flags)
static int 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 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.
static int has_duration (AVFormatContext *ic)
 Return TRUE if the stream has accurate duration in any stream.
static void 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 estimate_timings_from_bit_rate (AVFormatContext *ic)
static void estimate_timings_from_pts (AVFormatContext *ic, int64_t old_offset)
static void estimate_timings (AVFormatContext *ic, int64_t old_offset)
static int has_codec_parameters (AVCodecContext *avctx)
static int has_decode_delay_been_guessed (AVStream *st)
static int try_decode_frame (AVStream *st, AVPacket *avpkt, AVDictionary **options)
unsigned int ff_codec_get_tag (const AVCodecTag *tags, enum CodecID id)
enum CodecID ff_codec_get_id (const AVCodecTag *tags, unsigned int tag)
unsigned int av_codec_get_tag (const AVCodecTag *const *tags, enum CodecID id)
enum CodecID av_codec_get_id (const AVCodecTag *const *tags, unsigned int tag)
static void compute_chapters_end (AVFormatContext *s)
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 avformat_find_stream_info (AVFormatContext *ic, AVDictionary **options)
 Read packets of a media file to get stream information.
AVProgram * av_find_program_from_stream (AVFormatContext *ic, AVProgram *last, int s)
 Find the programs which belong to a given stream.
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_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 avformat_free_context (AVFormatContext *s)
 Free an AVFormatContext and all its streams.
void av_close_input_file (AVFormatContext *s)
void avformat_close_input (AVFormatContext **ps)
 Close an opened input AVFormatContext.
AVStream * av_new_stream (AVFormatContext *s, int id)
 Add a new stream to a media file.
AVStream * avformat_new_stream (AVFormatContext *s, AVCodec *c)
 Add a new stream to a media file.
AVProgram * av_new_program (AVFormatContext *ac, int id)
AVChapter * avpriv_new_chapter (AVFormatContext *s, int id, AVRational time_base, int64_t start, int64_t end, const char *title)
 Add a new chapter.
int av_set_parameters (AVFormatContext *s, AVFormatParameters *ap)
int avformat_alloc_output_context2 (AVFormatContext **avctx, AVOutputFormat *oformat, const char *format, const char *filename)
 Allocate an AVFormatContext for an output format.
AVFormatContext * avformat_alloc_output_context (const char *format, AVOutputFormat *oformat, const char *filename)
static int validate_codec_tag (AVFormatContext *s, AVStream *st)
int av_write_header (AVFormatContext *s)
 Allocate the stream private data and write the stream header to an output media file.
int avformat_write_header (AVFormatContext *s, AVDictionary **options)
 Allocate the stream private data and write the stream header to an output media file.
static int compute_pkt_fields2 (AVFormatContext *s, AVStream *st, AVPacket *pkt)
int av_write_frame (AVFormatContext *s, AVPacket *pkt)
 Write a packet to an output media file.
int ff_interleave_add_packet (AVFormatContext *s, AVPacket *pkt, int(*compare)(AVFormatContext *, AVPacket *, AVPacket *))
 Add packet to AVFormatContext->packet_buffer list, determining its interleaved position using compare() function argument.
static int ff_interleave_compare_dts (AVFormatContext *s, AVPacket *next, AVPacket *pkt)
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 interleave_packet (AVFormatContext *s, AVPacket *out, AVPacket *in, int flush)
 Interleave an AVPacket correctly so it can be muxed.
int av_interleaved_write_frame (AVFormatContext *s, AVPacket *pkt)
 Write 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.
int av_get_output_timestamp (struct AVFormatContext *s, int stream, int64_t *dts, int64_t *wall)
 Get timing information for the data currently output.
void ff_program_add_stream_index (AVFormatContext *ac, int progid, unsigned int idx)
static void print_fps (double d, const char *postfix)
static void dump_metadata (void *ctx, AVDictionary *m, const char *indent)
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)
void av_dump_format (AVFormatContext *ic, int index, const char *url, int is_output)
int64_t av_gettime (void)
 Get the current time in microseconds.
uint64_t ff_ntp_time (void)
 Get the current time since NTP epoch in microseconds.
int64_t parse_date (const char *timestr, int duration)
 Parse datestr and return a corresponding number of microseconds.
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.
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, AVRational time_base)
void av_pkt_dump (FILE *f, AVPacket *pkt, int dump_payload)
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_log (void *avcl, int level, AVPacket *pkt, int dump_payload)
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.
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.
char * ff_data_to_hex (char *buff, const uint8_t *src, int s, int lowercase)
int ff_hex_to_data (uint8_t *data, const char *p)
 Parse a string of hexadecimal strings.
void av_set_pts_info (AVStream *s, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
void avpriv_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 ff_url_join (char *str, int size, const char *proto, const char *authorization, const char *hostname, int port, const char *fmt,...)
int ff_write_chained (AVFormatContext *dst, int dst_stream, AVPacket *pkt, AVFormatContext *src)
 Write a packet to another muxer than the one the user originally intended.
void ff_parse_key_value (const char *str, ff_parse_key_val_cb callback_get_buf, void *context)
 Parse a string with comma-separated key=value pairs.
int ff_find_stream_index (AVFormatContext *s, int id)
 Find stream index based on format-specific stream ID.
void ff_make_absolute_url (char *buf, int size, const char *base, const char *rel)
int64_t ff_iso8601_to_unix_time (const char *datestr)
 Convert a date string in ISO8601 format to Unix timestamp.
int avformat_query_codec (AVOutputFormat *ofmt, enum CodecID codec_id, int std_compliance)
 Test if the given container can store a codec.
int avformat_network_init (void)
 Do global initialization of network components.
int avformat_network_deinit (void)
 Undo the initialization done by avformat_network_init.
int ff_add_param_change (AVPacket *pkt, int32_t channels, uint64_t channel_layout, int32_t sample_rate, int32_t width, int32_t height)
 Add side data to a packet for changing parameters to the given values.
struct AVCodecTag * avformat_get_riff_video_tags (void)
struct AVCodecTag * avformat_get_riff_audio_tags (void)

Variables

static AVInputFormat * first_iformat = NULL
 head of registered input format linked list
static AVOutputFormat * first_oformat = NULL
 head of registered output format linked list

Detailed Description

various utility functions for use within FFmpeg

Definition in file utils.c.

Define Documentation

#define CHUNK_START   0x1000

Definition at line 3366 of file utils.c.

Referenced by ff_interleave_add_packet().

#define DURATION_MAX_READ_SIZE   250000

Definition at line 2078 of file utils.c.

Referenced by estimate_timings_from_pts().

#define DURATION_MAX_RETRY   3

Definition at line 2079 of file utils.c.

Referenced by estimate_timings_from_pts().

#define LICENSE_PREFIX   "libavformat license: "

#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 536 of file utils.c.

Referenced by av_probe_input_buffer().

#define PROBE_BUF_MIN   2048

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

Definition at line 535 of file utils.c.

Referenced by av_probe_input_buffer().

Function Documentation

static AVPacket* add_to_pktbuf ( AVPacketList **  packet_buffer,
AVPacket *  pkt,
AVPacketList **  plast_pktl 
) [static]

Definition at line 737 of file utils.c.

Referenced by av_read_frame(), av_read_packet(), and avformat_find_stream_info().

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:
pkt packet
size amount 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 312 of file utils.c.

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

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

Definition at line 2331 of file utils.c.

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

Definition at line 2321 of file utils.c.

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 
)

Definition at line 1661 of file utils.c.

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.

Parameters:
pkt packet
size desired payload size
Returns:
>0 (read size) if OK, AVERROR_xxx otherwise

Definition at line 291 of file utils.c.

Referenced by adx_read_packet(), aea_read_packet(), aiff_read_packet(), apc_read_packet(), asf_read_header(), au_read_packet(), av_append_packet(), bfi_read_packet(), cdata_read_packet(), cin_read_packet(), daud_packet(), dfa_read_packet(), dxa_read_packet(), ea_read_packet(), ff_rm_parse_packet(), ff_rm_retrieve_cache(), film_read_packet(), flv_read_packet(), fourxm_read_packet(), g729_read_packet(), gsm_read_packet(), gxf_packet(), idcin_read_packet(), iff_read_packet(), iss_read_packet(), lmlm4_read_packet(), load_ipmovie_packet(), mov_read_packet(), mp3_read_packet(), mpc8_read_packet(), mpegps_read_packet(), msnwc_tcp_read_packet(), mtv_read_packet(), mxf_decrypt_triplet(), mxf_get_d10_aes3_packet(), mxf_read_packet(), mxf_read_packet_old(), nc_read_packet(), nsv_read_chunk(), nuv_packet(), oma_read_packet(), pmp_packet(), pva_read_packet(), qcp_read_packet(), r3d_read_reda(), r3d_read_redv(), raw_read_packet(), rawvideo_read_packet(), read_packet(), rl2_read_packet(), roq_read_packet(), rpl_read_packet(), rso_read_packet(), seq_read_packet(), siff_read_packet(), smjpeg_read_packet(), sol_read_packet(), sox_read_packet(), swf_read_packet(), thp_read_packet(), tmv_read_packet(), tta_read_packet(), txd_read_packet(), vc1t_read_packet(), vid_read_packet(), voc_get_packet(), wc3_read_packet(), wsaud_read_packet(), wsvqa_read_packet(), xa_read_packet(), xmv_fetch_audio_packet(), xmv_fetch_video_packet(), xwma_read_packet(), yop_read_packet(), and yuv4_read_packet().

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 2902 of file utils.c.

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

Definition at line 3969 of file utils.c.

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

Definition at line 3982 of file utils.c.

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

Definition at line 1593 of file utils.c.

int av_set_parameters ( AVFormatContext *  s,
AVFormatParameters *  ap 
)

Deprecated:
pass the options to avformat_write_header directly.

Definition at line 3012 of file utils.c.

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

Deprecated:
this function is not supposed to be called outside of lavf

Definition at line 4106 of file utils.c.

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

Definition at line 1465 of file utils.c.

Referenced by seek_frame_byte().

AVFormatContext* avformat_alloc_output_context ( const char *  format,
AVOutputFormat *  oformat,
const char *  filename 
)

Deprecated:
deprecated in favor of avformat_alloc_output_context2()

Definition at line 3083 of file utils.c.

int avformat_alloc_output_context2 ( AVFormatContext **  ctx,
AVOutputFormat *  oformat,
const char *  format_name,
const char *  filename 
)

Allocate an AVFormatContext for an output format.

avformat_free_context() can be used to free the context and everything allocated by the framework within it.

Parameters:
*ctx is set to the created format context, or to NULL in case of failure
oformat format to use for allocating the context, if NULL format_name and filename are used instead
format_name the name of output format to use for allocating the context, if NULL filename is used instead
filename the name of the filename to use for allocating the context, may be NULL
Returns:
>= 0 in case of success, a negative AVERROR code in case of failure

Definition at line 3029 of file utils.c.

Referenced by avformat_alloc_output_context(), main(), and opt_output_file().

AVChapter* avpriv_new_chapter ( AVFormatContext *  s,
int  id,
AVRational  time_base,
int64_t  start,
int64_t  end,
const char *  title 
)

Add a new chapter.

Parameters:
s media file handle
id unique ID for this chapter
start chapter start time in time_base units
end chapter end time in time_base units
title chapter title
Returns:
AVChapter or NULL on error

Definition at line 2984 of file utils.c.

Referenced by asf_read_marker(), decode_info_header(), flac_read_header(), matroska_read_header(), mov_read_chapters(), mov_read_chpl(), ogm_chapter(), read_chapter(), and read_header().

void avpriv_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:
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 4113 of file utils.c.

Referenced by add_av_stream1(), adts_aac_read_header(), adx_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(), audio_write_header(), av_set_pts_info(), avformat_new_stream(), avi_read_header(), avi_write_header(), avisynth_read_header(), bfi_read_header(), bmv_read_header(), cdata_read_header(), celt_header(), cin_read_header(), create_audio_stream(), create_stream(), dc1394_read_header(), decode_stream_header(), dfa_read_header(), dirac_header(), dshow_add_device(), 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(), g723_1_init(), g729_read_header(), get_packet_header(), grab_read_header(), gsm_read_header(), gxf_header(), gxf_write_header(), idcin_read_header(), iff_read_header(), ipmovie_read_header(), iss_read_header(), lavfi_read_header(), lmlm4_read_header(), loas_read_header(), lxf_read_header(), matroska_read_header(), microdvd_read_header(), mkv_write_tracks(), mmf_read_header(), modplug_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(), nut_write_header(), nuv_header(), ogg_new_stream(), ogg_write_header(), ogm_header(), old_dirac_header(), oma_read_header(), pmp_header(), pulse_read_header(), pva_read_header(), qt_rtp_parse_packet(), r3d_read_red1(), read_gab2_sub(), read_header(), read_sl_header(), rl2_read_header(), roq_read_packet(), rpl_read_header(), rso_read_header(), sbg_read_header(), seq_read_header(), siff_parse_vbv1(), skeleton_header(), smacker_read_header(), smjpeg_read_header(), smjpeg_write_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(), write_stream_data(), wsaud_read_header(), wsvqa_read_header(), wv_read_header(), x11grab_read_header(), xa_read_header(), xmv_read_header(), xwma_read_header(), yop_read_header(), and yuv4_read_header().

static void compute_chapters_end ( AVFormatContext *  s  )  [static]

Definition at line 2341 of file utils.c.

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 886 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 1016 of file utils.c.

Referenced by read_frame_internal().

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

Definition at line 3272 of file utils.c.

Referenced by av_interleaved_write_frame(), and av_write_frame().

static AVDictionary* convert_format_parameters ( AVFormatParameters *  ap  )  [static]

Definition at line 428 of file utils.c.

Referenced by av_open_input_file(), and av_open_input_stream().

static void dump_metadata ( void *  ctx,
AVDictionary *  m,
const char *  indent 
) [static]

Definition at line 3646 of file utils.c.

Referenced by av_dump_format(), and dump_stream_format().

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

Definition at line 3665 of file utils.c.

Referenced by av_dump_format().

static void estimate_timings ( AVFormatContext *  ic,
int64_t  old_offset 
) [static]

Definition at line 2162 of file utils.c.

static void estimate_timings_from_bit_rate ( AVFormatContext *  ic  )  [static]

Definition at line 2046 of file utils.c.

Referenced by estimate_timings().

static void estimate_timings_from_pts ( AVFormatContext *  ic,
int64_t  old_offset 
) [static]

Definition at line 2082 of file utils.c.

Referenced by estimate_timings().

int ff_add_index_entry ( AVIndexEntry **  index_entries,
int *  nb_index_entries,
unsigned int *  index_entries_allocated_size,
int64_t  pos,
int64_t  timestamp,
int  size,
int  distance,
int  flags 
)

Internal version of av_add_index_entry.

Definition at line 1497 of file utils.c.

Referenced by av_add_index_entry(), and read_header().

int ff_add_param_change ( AVPacket *  pkt,
int32_t  channels,
uint64_t  channel_layout,
int32_t  sample_rate,
int32_t  width,
int32_t  height 
)

Add side data to a packet for changing parameters to the given values.

Parameters set to 0 aren't included in the change.

Definition at line 4362 of file utils.c.

Referenced by flv_read_packet(), and load_ipmovie_packet().

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

Definition at line 2307 of file utils.c.

Referenced by asf_read_stream_properties(), au_read_header(), av_codec_get_id(), avi_read_header(), avisynth_read_header(), decode_stream_header(), ff_mov_read_stsd_entries(), ff_mp4_read_dec_config_descr(), ff_rm_read_mdpr_codecdata(), get_aiff_header(), get_codec_data(), lxf_read_header(), matroska_read_header(), nsv_parse_NSVs_header(), nut_read_header(), ogm_dshow_header(), ogm_header(), oma_read_header(), parse_media_type(), read_desc_chunk(), read_header(), rm_read_audio_stream_info(), rso_read_header(), smjpeg_read_header(), swf_read_packet(), and voc_get_packet().

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

Definition at line 2297 of file utils.c.

Referenced by av_codec_get_tag(), caf_write_header(), gxf_write_header(), ipod_get_codec_tag(), mkv_write_codecprivate(), mkv_write_tracks(), mov_find_codec_tag(), mov_get_codec_tag(), mov_write_esds_tag(), mp4_get_codec_tag(), smjpeg_write_header(), and swf_write_video().

char* ff_data_to_hex ( char *  buff,
const uint8_t *  src,
int  s,
int  lowercase 
)

Definition at line 4056 of file utils.c.

Referenced by ff_rdt_calc_response_and_checksum(), hex_log(), make_digest_auth(), and open_input().

int ff_find_stream_index ( AVFormatContext *  s,
int  id 
)

Find stream index based on format-specific stream ID.

Returns:
stream index, or < 0 on error

Definition at line 4248 of file utils.c.

Referenced by get_sindex(), parse_chunks(), and pmt_cb().

int64_t ff_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().

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

Definition at line 1672 of file utils.c.

Referenced by av_gen_search(), ff_seek_frame_binary(), and read_seek().

int ff_hex_to_data ( uint8_t *  data,
const char *  p 
)

Parse a string of hexadecimal strings.

Any space between the hexadecimal digits is ignored.

Parameters:
data if non-null, the parsed data is written to this pointer
p the string to parse
Returns:
the number of bytes written (or to be written, if data is null)

Definition at line 4077 of file utils.c.

Referenced by parse_fmtp_config(), and parse_playlist().

int ff_index_search_timestamp ( const AVIndexEntry *  entries,
int  nb_entries,
int64_t  wanted_timestamp,
int  flags 
)

Internal version of av_index_search_timestamp.

Definition at line 1551 of file utils.c.

Referenced by av_index_search_timestamp(), ff_add_index_entry(), mxf_read_seek(), and read_seek().

int ff_interleave_add_packet ( AVFormatContext *  s,
AVPacket *  pkt,
int(*)(AVFormatContext *, AVPacket *, AVPacket *)  compare 
)

Add packet to AVFormatContext->packet_buffer list, determining its interleaved position using compare() function argument.

Returns:
0, or < 0 on error

Definition at line 3368 of file utils.c.

Referenced by av_interleave_packet_per_dts(), and ff_audio_rechunk_interleave().

static int ff_interleave_compare_dts ( AVFormatContext *  s,
AVPacket *  next,
AVPacket *  pkt 
) [static]

Definition at line 3427 of file utils.c.

Referenced by av_interleave_packet_per_dts().

int64_t ff_iso8601_to_unix_time ( const char *  datestr  ) 

Convert a date string in ISO8601 format to Unix timestamp.

Definition at line 4309 of file utils.c.

Referenced by dv_init_mux(), gxf_write_umf_material_description(), mov_write_header(), and mxf_write_header().

void ff_make_absolute_url ( char *  buf,
int  size,
const char *  base,
const char *  rel 
)

Definition at line 4258 of file utils.c.

Referenced by new_variant(), and parse_playlist().

uint64_t ff_ntp_time ( void   ) 

Get the current time since NTP epoch in microseconds.

Definition at line 3823 of file utils.c.

Referenced by rtp_write_header(), and rtp_write_packet().

void ff_parse_key_value ( const char *  str,
ff_parse_key_val_cb  callback_get_buf,
void *  context 
)

Parse a string with comma-separated key=value pairs.

The value strings may be quoted and may contain escaped characters within quoted strings.

Parameters:
str the string to parse
callback_get_buf function that returns where to store the unescaped value string.
context the opaque context pointer to pass to callback_get_buf

Definition at line 4194 of file utils.c.

Referenced by ff_http_auth_handle_header(), and parse_playlist().

void ff_program_add_stream_index ( AVFormatContext *  ac,
int  progid,
unsigned int  idx 
)

Definition at line 3611 of file utils.c.

Referenced by pmt_cb().

void ff_read_frame_flush ( AVFormatContext *  s  ) 

Flush the frame reader.

Definition at line 1431 of file utils.c.

Referenced by av_seek_frame(), avformat_seek_file(), ff_restore_parser_state(), ff_seek_frame_binary(), mpegts_get_dts(), search_hi_lo_keyframes(), and seek_frame_generic().

void ff_reduce_index ( AVFormatContext *  s,
int  stream_index 
)

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

Definition at line 1484 of file utils.c.

Referenced by mpegps_read_pes_header(), mpegts_get_dts(), and read_frame_internal().

int ff_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().

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

Definition at line 1598 of file utils.c.

Referenced by asf_read_seek(), av_seek_frame_binary(), and ogg_read_seek().

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

Definition at line 1471 of file utils.c.

Referenced by av_update_cur_dts(), ff_seek_frame_binary(), matroska_read_seek(), mxf_read_seek(), and seek_frame_generic().

int ff_url_join ( char *  str,
int  size,
const char *  proto,
const char *  authorization,
const char *  hostname,
int  port,
const char *  fmt,
  ... 
)

Definition at line 4131 of file utils.c.

int ff_write_chained ( AVFormatContext *  dst,
int  dst_stream,
AVPacket *  pkt,
AVFormatContext *  src 
)

Write a packet to another muxer than the one the user originally intended.

Useful when chaining muxers, where one muxer internally writes a received packet to another muxer.

Parameters:
dst the muxer to write the packet to
dst_stream the stream index within dst to write the packet to
pkt the packet to be written
src the muxer the packet originally was intended for
Returns:
the value av_write_frame returned

Definition at line 4176 of file utils.c.

Referenced by ff_mov_add_hinted_packet(), rtsp_write_packet(), and sap_write_packet().

int ffio_limit ( AVIOContext *  s,
int  size 
)

Definition at line 271 of file utils.c.

Referenced by av_get_packet(), cin_read_packet(), film_read_packet(), roq_read_packet(), siff_read_packet(), and vmd_read_packet().

static void fill_all_stream_timings ( AVFormatContext *  ic  )  [static]

Definition at line 2029 of file utils.c.

Referenced by estimate_timings(), and estimate_timings_from_pts().

static void flush_packet_queue ( AVFormatContext *  s  )  [static]

Definition at line 1383 of file utils.c.

Referenced by av_close_input_stream(), avformat_close_input(), estimate_timings_from_pts(), and ff_read_frame_flush().

static void 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 105 of file utils.c.

Referenced by compute_pkt_fields2().

static void 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 87 of file utils.c.

Referenced by avformat_write_header().

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 856 of file utils.c.

Referenced by compute_frame_duration(), and compute_pkt_fields2().

static int get_std_framerate ( int  i  )  [static]

Definition at line 2362 of file utils.c.

Referenced by avformat_find_stream_info().

static int has_codec_parameters ( AVCodecContext *  avctx  )  [static]

Definition at line 2206 of file utils.c.

Referenced by avformat_find_stream_info(), and try_decode_frame().

static int has_decode_delay_been_guessed ( AVStream *  st  )  [static]

Definition at line 2233 of file utils.c.

Referenced by try_decode_frame().

static int has_duration ( AVFormatContext *  ic  )  [static]

Return 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 1961 of file utils.c.

Referenced by estimate_timings().

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

Definition at line 3903 of file utils.c.

Referenced by av_hex_dump(), and av_hex_dump_log().

static int init_input ( AVFormatContext *  s,
const char *  filename,
AVDictionary **  options 
) [static]

Definition at line 633 of file utils.c.

Referenced by avformat_open_input().

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

Interleave 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 occurred

Definition at line 3517 of file utils.c.

Referenced by av_interleaved_write_frame(), and av_write_trailer().

static int is_intra_only ( AVCodecContext *  enc  )  [static]

Definition at line 926 of file utils.c.

Referenced by compute_pkt_fields().

static int match_format ( const char *  name,
const char *  names 
) [static]

Definition at line 187 of file utils.c.

Referenced by av_find_input_format().

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

Definition at line 3942 of file utils.c.

Referenced by av_pkt_dump(), av_pkt_dump2(), av_pkt_dump_log(), and av_pkt_dump_log2().

static void print_fps ( double  d,
const char *  postfix 
) [static]

Definition at line 3639 of file utils.c.

Referenced by dump_stream_format().

static int read_frame_internal ( AVFormatContext *  s,
AVPacket *  pkt 
) [static]

Definition at line 1174 of file utils.c.

Referenced by av_read_frame(), and avformat_find_stream_info().

static int read_from_packet_buffer ( AVFormatContext *  s,
AVPacket *  pkt 
) [static]

Definition at line 1322 of file utils.c.

Referenced by av_read_frame().

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

Definition at line 1794 of file utils.c.

Referenced by av_seek_frame().

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

Definition at line 1819 of file utils.c.

static int set_codec_from_probe_data ( AVFormatContext *  s,
AVStream *  st,
AVProbeData *  pd 
) [static]

Definition at line 390 of file utils.c.

Referenced by av_read_packet().

static int tb_unreliable ( AVCodecContext *  c  )  [static]

Definition at line 2375 of file utils.c.

Referenced by avformat_find_stream_info().

static int try_decode_frame ( AVStream *  st,
AVPacket *  avpkt,
AVDictionary **  options 
) [static]

Definition at line 2240 of file utils.c.

Referenced by avformat_find_stream_info().

static void update_initial_durations ( AVFormatContext *  s,
AVStream *  st,
AVPacket *  pkt 
) [static]

Definition at line 980 of file utils.c.

Referenced by compute_pkt_fields().

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

Definition at line 951 of file utils.c.

Referenced by compute_pkt_fields().

static void 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 1981 of file utils.c.

Referenced by estimate_timings(), and fill_all_stream_timings().

static int validate_codec_tag ( AVFormatContext *  s,
AVStream *  st 
) [static]

Check that tag + id is in the table If neither is in the table -> OK If tag is in the table with another id -> FAIL If id is in the table with another tag -> FAIL unless strict < normal

Definition at line 3092 of file utils.c.

Referenced by avformat_write_header().

Variable Documentation

AVInputFormat* first_iformat = NULL [static]

head of registered input format linked list

Definition at line 126 of file utils.c.

AVOutputFormat* first_oformat = NULL [static]

head of registered output format linked list

Definition at line 128 of file utils.c.

Generated on Fri Oct 26 02:46:10 2012 for FFmpeg by  doxygen 1.5.8