Libav 0.7.1
Defines | Functions | Variables
libavformat/utils.c File Reference

various utility functions for use within Libav More...

#include "avformat.h"
#include "avio_internal.h"
#include "internal.h"
#include "libavcodec/internal.h"
#include "libavutil/opt.h"
#include "libavutil/dict.h"
#include "libavutil/pixdesc.h"
#include "metadata.h"
#include "id3v2.h"
#include "libavutil/avstring.h"
#include "riff.h"
#include "audiointerleave.h"
#include "url.h"
#include <sys/time.h>
#include <time.h>
#include <strings.h>
#include <stdarg.h>
#include <assert.h>
#include "libavutil/parseutils.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 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 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)
 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.
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)
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.
AVInputFormatav_find_input_format (const char *short_name)
 Find AVInputFormat based on the short name of the input format.
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.
AVInputFormatav_probe_input_format2 (AVProbeData *pd, int is_opened, int *score_max)
 Guess the file format.
AVInputFormatav_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, int score)
static AVDictionaryconvert_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_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)
int avformat_open_input (AVFormatContext **ps, const char *filename, AVInputFormat *fmt, AVDictionary **options)
 Open an input stream and read the header.
static AVPacketadd_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 av_read_frame_internal (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)
 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)
 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))
 Perform 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 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 av_has_duration (AVFormatContext *ic)
 Return 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, int64_t old_offset)
static void av_estimate_timings (AVFormatContext *ic, int64_t old_offset)
static int has_codec_parameters (AVCodecContext *enc)
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.
static AVProgramfind_program_from_stream (AVFormatContext *ic, int s)
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)
 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)
AVChapterff_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)
 media file output
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.
void 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 av_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.
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)
 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,...)
 Assemble a URL string from components.
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)

Variables

static AVInputFormatfirst_iformat = NULL
 head of registered input format linked list
static AVOutputFormatfirst_oformat = NULL
 head of registered output format linked list

Detailed Description

various utility functions for use within Libav

Definition in file utils.c.


Define Documentation

#define DURATION_MAX_READ_SIZE   250000

Definition at line 1917 of file utils.c.

Referenced by av_estimate_timings_from_pts().

#define DURATION_MAX_RETRY   3

Definition at line 1918 of file utils.c.

Referenced by av_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 481 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 480 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 672 of file utils.c.

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

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 2591 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 AVCodecTag *const *  tags,
unsigned int  tag 
)

Definition at line 2151 of file utils.c.

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

Definition at line 2141 of file utils.c.

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

Definition at line 3317 of file utils.c.

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

static void av_estimate_timings ( AVFormatContext ic,
int64_t  old_offset 
) [static]

Definition at line 2000 of file utils.c.

Referenced by avformat_find_stream_info().

static void av_estimate_timings_from_bit_rate ( AVFormatContext ic) [static]

Definition at line 1884 of file utils.c.

Referenced by av_estimate_timings().

static void av_estimate_timings_from_pts ( AVFormatContext ic,
int64_t  old_offset 
) [static]

Definition at line 1921 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:
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 2518 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.
Deprecated:
use avformat_find_stream_info.

Definition at line 2208 of file utils.c.

Referenced by build_file_streams(), decode_thread(), main(), open_input_file(), 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:
ffractional number
incrincrement, can be positive or negative

Definition at line 99 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:
ffractional number
valinteger value
nummust be >= 0
denmust be >= 1

Definition at line 81 of file utils.c.

Referenced by avformat_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 
)

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 3428 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 
)

Allocate and read the payload of a packet and initialize its fields with default values.

Parameters:
pktpacket
sizedesired payload size
Returns:
>0 (read size) if OK, AVERROR_xxx otherwise

Definition at line 266 of file utils.c.

Referenced by aea_read_packet(), aiff_read_packet(), apc_read_packet(), 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(), 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(), nc_read_packet(), nsv_read_chunk(), nuv_packet(), oma_read_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(), 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(), xa_read_packet(), xwma_read_packet(), yop_read_packet(), and yuv4_read_packet().

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().

static int av_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 1803 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:
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 3512 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 3517 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().

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

Interleave an AVPacket correctly so it can be muxed.

Parameters:
outthe interleaved packet will be output here
inthe 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 3124 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 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 3085 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 3131 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 ac,
int  id 
)

Definition at line 2701 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 2650 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().

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().

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.

Allocate all the structures needed to read an input stream.

'fmt' must be specified.

Definition at line 439 of file utils.c.

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

Definition at line 3549 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 3556 of file utils.c.

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

Definition at line 3562 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 3569 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().

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

Definition at line 1090 of file utils.c.

Referenced by av_read_frame(), and avformat_find_stream_info().

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 2582 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 2573 of file utils.c.

Referenced by decode_thread().

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_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().

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

Definition at line 1652 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 1677 of file utils.c.

Referenced by av_seek_frame().

int av_set_parameters ( AVFormatContext s,
AVFormatParameters ap 
)

media file output

Deprecated:
pass the options to avformat_write_header directly.

Definition at line 2752 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 3685 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().

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 1821 of file utils.c.

Referenced by av_estimate_timings(), and fill_all_stream_timings().

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 3575 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 3026 of file utils.c.

Referenced by ff_write_chained(), and http_prepare_data().

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 2810 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 3163 of file utils.c.

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

const char* avformat_configuration ( void  )

Return the libavformat build-time configuration.

Definition at line 58 of file utils.c.

int avformat_find_stream_info ( AVFormatContext ic,
AVDictionary **  options 
)

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
optionsIf non-NULL, an ic.nb_streams long array of pointers to dictionaries, where i-th member contains options for codec corresponding to i-th stream. On return each dictionary will be filled with options that were not found.
Returns:
>=0 if OK, AVERROR_xxx on error
Note:
this function isn't guaranteed to open all the codecs, so options being non-empty at return is a perfectly normal behavior.
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 2214 of file utils.c.

Referenced by av_find_stream_info(), and movie_init().

void avformat_free_context ( AVFormatContext s)

Free an AVFormatContext and all its streams.

Parameters:
scontext to free

Definition at line 2599 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.

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 2816 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().

static void compute_chapters_end ( AVFormatContext s) [static]

Definition at line 2161 of file utils.c.

Referenced by avformat_find_stream_info().

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 800 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 926 of file utils.c.

Referenced by av_read_frame_internal().

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

Definition at line 2951 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 393 of file utils.c.

Referenced by av_open_input_file(), and av_open_input_stream().

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

Definition at line 3308 of file utils.c.

Referenced by transcode().

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

Definition at line 3231 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 3245 of file utils.c.

Referenced by av_dump_format().

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 1391 of file utils.c.

Referenced by av_add_index_entry(), and read_header().

enum CodecID ff_codec_get_id ( const AVCodecTag tags,
unsigned int  tag 
)
unsigned int ff_codec_get_tag ( const AVCodecTag tags,
enum CodecID  id 
)
char* ff_data_to_hex ( char *  buff,
const uint8_t *  src,
int  s,
int  lowercase 
)

Definition at line 3636 of file utils.c.

Referenced by ff_rdt_calc_response_and_checksum(), 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 3820 of file utils.c.

Referenced by get_sindex(), and parse_chunks().

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

Definition at line 3657 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 1445 of file utils.c.

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

void 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.

Definition at line 3037 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 3073 of file utils.c.

Referenced by av_interleave_packet_per_dts().

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

Definition at line 3830 of file utils.c.

Referenced by new_variant(), and parse_playlist().

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

Add a new chapter.

Parameters:
smedia file handle
idunique ID for this chapter
startchapter start time in time_base units
endchapter end time in time_base units
titlechapter title
Returns:
AVChapter or NULL on error

Definition at line 2724 of file utils.c.

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

uint64_t ff_ntp_time ( void  )

Get the current time since NTP epoch in microseconds.

Definition at line 3403 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:
strthe string to parse
callback_get_buffunction that returns where to store the unescaped value string.
contextthe opaque context pointer to pass to callback_get_buf

Definition at line 3766 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 3196 of file utils.c.

Referenced by pmt_cb().

void ff_read_frame_flush ( AVFormatContext s)

Flush the frame reader.

Definition at line 1334 of file utils.c.

Referenced by av_seek_frame(), av_seek_frame_generic(), avformat_seek_file(), ff_restore_parser_state(), and search_hi_lo_keyframes().

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 1378 of file utils.c.

Referenced by av_read_frame_internal(), and mpegps_read_pes_header().

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

Assemble a URL string from components.

This is the reverse operation of av_url_split.

Note, this requires networking to be initialized, so the caller must ensure ff_network_init has been called.

See also:
av_url_split
Parameters:
strthe buffer to fill with the url
sizethe size of the str buffer
protothe protocol identifier, if null, the separator after the identifier is left out, too
authorizationan optional authorization string, may be null. An empty string is treated the same as a null string.
hostnamethe host name string
portthe port number, left out from the string if negative
fmta generic format string for everything to add after the host/port, may be null
Returns:
the number of characters written to the destination buffer

Definition at line 3703 of file utils.c.

Referenced by build_udp_url(), ff_rtsp_setup_output_streams(), gen_connect(), gopher_open(), http_open_cnx(), mms_open(), mmsh_open(), rtmp_open(), rtp_set_remote_url(), sap_read_header(), and sap_write_header().

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:
dstthe muxer to write the packet to
dst_streamthe stream index within dst to write the packet to
pktthe packet to be written
srcthe muxer the packet originally was intended for
Returns:
the value av_write_frame returned

Definition at line 3748 of file utils.c.

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

static void fill_all_stream_timings ( AVFormatContext ic) [static]

Definition at line 1867 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 
)
Deprecated:
use av_find_info_tag in libavutil instead.

Definition at line 3422 of file utils.c.

static AVProgram* find_program_from_stream ( AVFormatContext ic,
int  s 
) [static]

Definition at line 2507 of file utils.c.

Referenced by av_find_best_stream().

static void flush_packet_queue ( AVFormatContext s) [static]
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 770 of file utils.c.

Referenced by compute_frame_duration(), and compute_pkt_fields2().

static int get_std_framerate ( int  i) [static]

Definition at line 2182 of file utils.c.

Referenced by avformat_find_stream_info().

static int has_codec_parameters ( AVCodecContext enc) [static]

Definition at line 2046 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 2071 of file utils.c.

Referenced by avformat_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 3483 of file utils.c.

Referenced by av_hex_dump(), and av_hex_dump_log().

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

Definition at line 570 of file utils.c.

Referenced by avformat_open_input().

static int is_intra_only ( AVCodecContext enc) [static]

Definition at line 837 of file utils.c.

Referenced by compute_pkt_fields().

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

Definition at line 181 of file utils.c.

Referenced by av_find_input_format().

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 3411 of file utils.c.

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

Definition at line 3522 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 3224 of file utils.c.

Referenced by dump_stream_format().

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

Definition at line 357 of file utils.c.

Referenced by av_read_packet().

static int tb_unreliable ( AVCodecContext c) [static]

Definition at line 2195 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 2077 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 890 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 861 of file utils.c.

Referenced by compute_pkt_fields().

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 2776 of file utils.c.

Referenced by avformat_write_header().


Variable Documentation

head of registered input format linked list

Definition at line 120 of file utils.c.

Referenced by av_iformat_next(), and av_register_input_format().

head of registered output format linked list

Definition at line 122 of file utils.c.

Referenced by av_oformat_next(), and av_register_output_format().