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utils.c File Reference

various utility functions for use within FFmpeg More...

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

Go to the source code of this file.

Macros

#define LICENSE_PREFIX   "libavformat license: "
 
#define RELATIVE_TS_BASE   (INT64_MAX - (1LL<<48))
 
#define SANE_CHUNK_SIZE   (50000000)
 
#define DURATION_MAX_READ_SIZE   250000LL
 
#define DURATION_MAX_RETRY   4
 
#define FAIL(errmsg)
 

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 int is_relative (int64_t ts)
 
static int64_t wrap_timestamp (AVStream *st, int64_t timestamp)
 Wrap a given time stamp, if there is an indication for an overflow.
 
int64_t av_stream_get_end_pts (const AVStream *st)
 Returns the pts of the last muxed packet + its duration.
 
struct AVCodecParserContextav_stream_get_parser (const AVStream *st)
 
void av_format_inject_global_side_data (AVFormatContext *s)
 This function will cause global side data to be injected in the next packet of each stream as well as after any subsequent seek.
 
static const AVCodecfind_decoder (AVFormatContext *s, AVStream *st, enum AVCodecID codec_id)
 
int av_format_get_probe_score (const AVFormatContext *s)
 
int ffio_limit (AVIOContext *s, int size)
 
static int append_packet_chunked (AVIOContext *s, AVPacket *pkt, 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.
 
static int set_codec_from_probe_data (AVFormatContext *s, AVStream *st, AVProbeData *pd)
 
int av_demuxer_open (AVFormatContext *ic)
 
static int init_input (AVFormatContext *s, const char *filename, AVDictionary **options)
 
static AVPacketadd_to_pktbuf (AVPacketList **packet_buffer, AVPacket *pkt, AVPacketList **plast_pktl)
 
int avformat_queue_attached_pictures (AVFormatContext *s)
 
int avformat_open_input (AVFormatContext **ps, const char *filename, AVInputFormat *fmt, AVDictionary **options)
 Open an input stream and read the header.
 
static void force_codec_ids (AVFormatContext *s, AVStream *st)
 
static int probe_codec (AVFormatContext *s, AVStream *st, const AVPacket *pkt)
 
static int update_wrap_reference (AVFormatContext *s, AVStream *st, int stream_index, AVPacket *pkt)
 
int ff_read_packet (AVFormatContext *s, AVPacket *pkt)
 Read a transport packet from a media file.
 
static int determinable_frame_size (AVCodecContext *avctx)
 
void ff_compute_frame_duration (AVFormatContext *s, int *pnum, int *pden, AVStream *st, AVCodecParserContext *pc, AVPacket *pkt)
 Return the frame duration in seconds.
 
static int is_intra_only (AVCodecContext *enc)
 
static int has_decode_delay_been_guessed (AVStream *st)
 
static AVPacketListget_next_pkt (AVFormatContext *s, AVStream *st, AVPacketList *pktl)
 
static int64_t select_from_pts_buffer (AVStream *st, int64_t *pts_buffer, int64_t dts)
 
static void update_initial_timestamps (AVFormatContext *s, int stream_index, int64_t dts, int64_t pts, AVPacket *pkt)
 
static void update_initial_durations (AVFormatContext *s, AVStream *st, int stream_index, int duration)
 
static void compute_pkt_fields (AVFormatContext *s, AVStream *st, AVCodecParserContext *pc, AVPacket *pkt)
 
static void free_packet_buffer (AVPacketList **pkt_buf, AVPacketList **pkt_buf_end)
 
static int parse_packet (AVFormatContext *s, AVPacket *pkt, int stream_index)
 Parse a packet, add all split parts to parse_queue.
 
static int read_from_packet_buffer (AVPacketList **pkt_buffer, AVPacketList **pkt_buffer_end, AVPacket *pkt)
 
static int64_t ts_to_samples (AVStream *st, int64_t ts)
 
static int 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 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.
 
static int64_t ff_read_timestamp (AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit, int64_t(*read_timestamp)(struct AVFormatContext *, int, int64_t *, int64_t))
 
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().
 
int ff_find_last_ts (AVFormatContext *s, int stream_index, int64_t *ts, int64_t *pos, 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)
 
static int seek_frame_internal (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 (AVStream *st, const char **errmsg_ptr)
 
static int try_decode_frame (AVFormatContext *s, AVStream *st, AVPacket *avpkt, AVDictionary **options)
 
unsigned int ff_codec_get_tag (const AVCodecTag *tags, enum AVCodecID id)
 
enum AVCodecID ff_codec_get_id (const AVCodecTag *tags, unsigned int tag)
 
enum AVCodecID ff_get_pcm_codec_id (int bps, int flt, int be, int sflags)
 Select a PCM codec based on the given parameters.
 
unsigned int av_codec_get_tag (const AVCodecTag *const *tags, enum AVCodecID id)
 
int av_codec_get_tag2 (const AVCodecTag *const *tags, enum AVCodecID id, unsigned int *tag)
 
enum AVCodecID 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 ff_alloc_extradata (AVCodecContext *avctx, int size)
 Allocate extradata with additional FF_INPUT_BUFFER_PADDING_SIZE at end which is always set to 0.
 
int ff_get_extradata (AVCodecContext *avctx, AVIOContext *pb, int size)
 Allocate extradata with additional FF_INPUT_BUFFER_PADDING_SIZE at end which is always set to 0 and fill it from pb.
 
int ff_rfps_add_frame (AVFormatContext *ic, AVStream *st, int64_t ts)
 add frame for rfps calculation.
 
void ff_rfps_calculate (AVFormatContext *ic)
 
int avformat_find_stream_info (AVFormatContext *ic, AVDictionary **options)
 Read packets of a media file to get stream information.
 
AVProgramav_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 ff_free_stream (AVFormatContext *s, AVStream *st)
 
void avformat_free_context (AVFormatContext *s)
 Free an AVFormatContext and all its streams.
 
void avformat_close_input (AVFormatContext **ps)
 Close an opened input AVFormatContext.
 
AVStreamavformat_new_stream (AVFormatContext *s, const AVCodec *c)
 Add a new stream to a media file.
 
AVProgramav_new_program (AVFormatContext *ac, int id)
 
AVChapteravpriv_new_chapter (AVFormatContext *s, int id, AVRational time_base, int64_t start, int64_t end, const char *title)
 Add a new chapter.
 
void ff_program_add_stream_index (AVFormatContext *ac, int progid, unsigned idx)
 
uint64_t ff_ntp_time (void)
 Get the current time since NTP epoch in microseconds.
 
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.
 
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 avpriv_set_pts_info (AVStream *s, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
 Set the time base and wrapping info for a given stream.
 
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.
 
int64_t ff_iso8601_to_unix_time (const char *datestr)
 Convert a date string in ISO8601 format to Unix timestamp.
 
int avformat_query_codec (const AVOutputFormat *ofmt, enum AVCodecID 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.
 
AVRational av_guess_sample_aspect_ratio (AVFormatContext *format, AVStream *stream, AVFrame *frame)
 Guess the sample aspect ratio of a frame, based on both the stream and the frame aspect ratio.
 
AVRational av_guess_frame_rate (AVFormatContext *format, AVStream *st, AVFrame *frame)
 Guess the frame rate, based on both the container and codec information.
 
int avformat_match_stream_specifier (AVFormatContext *s, AVStream *st, const char *spec)
 Check if the stream st contained in s is matched by the stream specifier spec.
 
int ff_generate_avci_extradata (AVStream *st)
 Generate standard extradata for AVC-Intra based on width/height and field order.
 
uint8_tav_stream_get_side_data (AVStream *st, enum AVPacketSideDataType type, int *size)
 Get side information from stream.
 

Detailed Description

various utility functions for use within FFmpeg

Definition in file utils.c.

Macro Definition Documentation

#define LICENSE_PREFIX   "libavformat license: "
#define RELATIVE_TS_BASE   (INT64_MAX - (1LL<<48))
#define SANE_CHUNK_SIZE   (50000000)

Definition at line 159 of file utils.c.

Referenced by append_packet_chunked().

#define DURATION_MAX_READ_SIZE   250000LL

Definition at line 2338 of file utils.c.

Referenced by estimate_timings_from_pts().

#define DURATION_MAX_RETRY   4

Definition at line 2339 of file utils.c.

Referenced by estimate_timings_from_pts().

#define FAIL (   errmsg)
Value:
do { \
if (errmsg_ptr) \
*errmsg_ptr = errmsg; \
return 0; \
} while (0)

Function Documentation

static int is_relative ( int64_t  ts)
static
static int64_t wrap_timestamp ( AVStream st,
int64_t  timestamp 
)
static

Wrap a given time stamp, if there is an indication for an overflow.

Parameters
ststream
timestampthe time stamp to wrap
Returns
resulting time stamp

Definition at line 91 of file utils.c.

Referenced by av_add_index_entry(), ff_read_packet(), and ff_read_timestamp().

int64_t av_stream_get_end_pts ( const AVStream st)

Returns the pts of the last muxed packet + its duration.

the retuned value is undefined when used with a demuxer.

Definition at line 113 of file utils.c.

Referenced by do_video_stats(), and print_report().

struct AVCodecParserContext* av_stream_get_parser ( const AVStream st)
read

Definition at line 118 of file utils.c.

Referenced by process_input_packet().

void av_format_inject_global_side_data ( AVFormatContext s)

This function will cause global side data to be injected in the next packet of each stream as well as after any subsequent seek.

Definition at line 123 of file utils.c.

Referenced by read_thread().

static const AVCodec* find_decoder ( AVFormatContext s,
AVStream st,
enum AVCodecID  codec_id 
)
static

Definition at line 133 of file utils.c.

Referenced by av_find_best_stream(), avformat_find_stream_info(), and try_decode_frame().

int av_format_get_probe_score ( const AVFormatContext s)

Definition at line 153 of file utils.c.

Referenced by show_format().

int ffio_limit ( AVIOContext s,
int  size 
)
static int append_packet_chunked ( AVIOContext s,
AVPacket pkt,
int  size 
)
static

Definition at line 183 of file utils.c.

Referenced by av_append_packet(), and av_get_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
sassociated IO context
pktpacket
sizedesired payload size
Returns
>0 (read size) if OK, AVERROR_xxx otherwise

Definition at line 224 of file utils.c.

Referenced by adp_read_packet(), adx_read_packet(), aea_read_packet(), afc_read_packet(), aiff_read_packet(), apc_read_packet(), ape_tag_read_field(), asf_read_header(), asf_read_picture(), ast_read_packet(), av_append_packet(), bfi_read_packet(), cdata_read_packet(), cdxl_read_packet(), cin_read_packet(), cine_read_packet(), daud_packet(), dfa_read_packet(), dsf_read_packet(), dxa_read_packet(), ea_read_packet(), ff_pcm_read_packet(), ff_rm_parse_packet(), ff_rm_retrieve_cache(), ff_voc_get_packet(), film_read_packet(), flv_data_packet(), flv_read_packet(), fourxm_read_packet(), frm_read_packet(), g729_read_packet(), get_attachment(), gif_read_packet(), gsm_read_packet(), gxf_packet(), hnm_read_packet(), idcin_read_packet(), iff_read_packet(), ingenient_read_packet(), iss_read_packet(), lmlm4_read_packet(), load_ipmovie_packet(), lvf_read_packet(), mmf_read_packet(), mov_read_covr(), mov_read_packet(), mp3_read_packet(), mpc8_read_packet(), mpegps_read_packet(), msnwc_tcp_read_packet(), mtv_read_packet(), mv_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(), redspark_read_packet(), rl2_read_packet(), roq_read_packet(), rpl_read_packet(), rsd_read_packet(), sdr2_read_packet(), seq_read_packet(), siff_read_packet(), smjpeg_read_packet(), smush_read_packet(), sol_read_packet(), sup_read_packet(), swf_read_packet(), thp_read_packet(), tmv_read_packet(), tta_read_packet(), txd_read_packet(), vc1t_read_packet(), vid_read_packet(), vivo_read_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().

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
sassociated IO context
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 234 of file utils.c.

Referenced by dfa_read_packet(), ea_read_packet(), read_packet(), sup_read_packet(), vivo_read_packet(), wc3_read_header(), and wc3_read_packet().

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

Definition at line 248 of file utils.c.

Referenced by probe_codec().

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

Definition at line 312 of file utils.c.

Referenced by avformat_open_input().

static AVPacket* add_to_pktbuf ( AVPacketList **  packet_buffer,
AVPacket pkt,
AVPacketList **  plast_pktl 
)
static
static void force_codec_ids ( AVFormatContext s,
AVStream st 
)
static

Definition at line 489 of file utils.c.

Referenced by ff_read_packet(), and probe_codec().

static int probe_codec ( AVFormatContext s,
AVStream st,
const AVPacket pkt 
)
static

Definition at line 507 of file utils.c.

Referenced by ff_read_packet().

static int update_wrap_reference ( AVFormatContext s,
AVStream st,
int  stream_index,
AVPacket pkt 
)
static

Definition at line 557 of file utils.c.

Referenced by ff_read_packet().

int ff_read_packet ( AVFormatContext s,
AVPacket pkt 
)

Read a transport packet from a media file.

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

Definition at line 621 of file utils.c.

Referenced by asfrtp_parse_packet(), estimate_timings_from_pts(), get_subtitle_pkt(), read_frame_internal(), read_gab2_sub(), and seek_subtitle().

static int determinable_frame_size ( AVCodecContext avctx)
static

Definition at line 709 of file utils.c.

Referenced by has_codec_parameters().

void ff_compute_frame_duration ( AVFormatContext s,
int *  pnum,
int *  pden,
AVStream st,
AVCodecParserContext pc,
AVPacket pkt 
)

Return the frame duration in seconds.

Return 0 if not available.

Definition at line 723 of file utils.c.

Referenced by compute_pkt_fields(), compute_pkt_fields2(), and estimate_timings_from_pts().

static int is_intra_only ( AVCodecContext enc)
static

Definition at line 773 of file utils.c.

Referenced by compute_pkt_fields().

static int has_decode_delay_been_guessed ( AVStream st)
static

Definition at line 789 of file utils.c.

Referenced by compute_pkt_fields(), try_decode_frame(), and update_initial_timestamps().

static AVPacketList* get_next_pkt ( AVFormatContext s,
AVStream st,
AVPacketList pktl 
)
static

Definition at line 807 of file utils.c.

Referenced by update_initial_durations(), and update_initial_timestamps().

static int64_t select_from_pts_buffer ( AVStream st,
int64_t *  pts_buffer,
int64_t  dts 
)
static

Definition at line 816 of file utils.c.

Referenced by compute_pkt_fields(), and update_initial_timestamps().

static void update_initial_timestamps ( AVFormatContext s,
int  stream_index,
int64_t  dts,
int64_t  pts,
AVPacket pkt 
)
static

Definition at line 858 of file utils.c.

Referenced by compute_pkt_fields().

static void update_initial_durations ( AVFormatContext s,
AVStream st,
int  stream_index,
int  duration 
)
static

Definition at line 909 of file utils.c.

Referenced by compute_pkt_fields().

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

Definition at line 962 of file utils.c.

Referenced by parse_packet(), and read_frame_internal().

static void free_packet_buffer ( AVPacketList **  pkt_buf,
AVPacketList **  pkt_buf_end 
)
static

Definition at line 1135 of file utils.c.

Referenced by avformat_find_stream_info(), and flush_packet_queue().

static int parse_packet ( AVFormatContext s,
AVPacket pkt,
int  stream_index 
)
static

Parse a packet, add all split parts to parse_queue.

Parameters
pktPacket to parse, NULL when flushing the parser at end of stream.

Definition at line 1151 of file utils.c.

Referenced by read_frame_internal().

static int read_from_packet_buffer ( AVPacketList **  pkt_buffer,
AVPacketList **  pkt_buffer_end,
AVPacket pkt 
)
static

Definition at line 1255 of file utils.c.

Referenced by av_read_frame(), and read_frame_internal().

static int64_t ts_to_samples ( AVStream st,
int64_t  ts 
)
static

Definition at line 1270 of file utils.c.

Referenced by read_frame_internal().

static int read_frame_internal ( AVFormatContext s,
AVPacket pkt 
)
static

Definition at line 1275 of file utils.c.

Referenced by av_read_frame(), and avformat_find_stream_info().

static void flush_packet_queue ( AVFormatContext s)
static
void ff_read_frame_flush ( AVFormatContext s)
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
timestampnew dts expressed in time_base of param ref_st
ref_streference stream giving time_base of param timestamp

Definition at line 1609 of file utils.c.

Referenced by ff_seek_frame_binary(), idcin_read_seek(), matroska_read_seek(), mp3_seek(), mpc8_read_seek(), mxf_read_seek(), 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 1623 of file utils.c.

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

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 1636 of file utils.c.

Referenced by av_add_index_entry(), read_header(), and scan_file().

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 1704 of file utils.c.

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

static int64_t ff_read_timestamp ( AVFormatContext s,
int  stream_index,
int64_t *  ppos,
int64_t  pos_limit,
int64_t(*)(struct AVFormatContext *, int, int64_t *, int64_t)  read_timestamp 
)
static

Definition at line 1743 of file utils.c.

Referenced by ff_find_last_ts(), and ff_gen_search().

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_tstarget timestamp in the time base of the given stream
stream_indexstream number

Definition at line 1752 of file utils.c.

Referenced by asf_read_seek(), ogg_read_seek(), rm_read_seek(), and seek_frame_internal().

int ff_find_last_ts ( AVFormatContext s,
int  stream_index,
int64_t *  ts,
int64_t *  pos,
int64_t(*)(struct AVFormatContext *, int, int64_t *, int64_t)  read_timestamp 
)

Definition at line 1820 of file utils.c.

Referenced by ff_gen_search(), and find_duration().

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_tstarget timestamp in the time base of the given stream
stream_indexstream number

Definition at line 1858 of file utils.c.

Referenced by ff_seek_frame_binary(), and read_seek().

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

Definition at line 1967 of file utils.c.

Referenced by seek_frame_internal().

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

Definition at line 1987 of file utils.c.

Referenced by seek_frame_internal().

static int seek_frame_internal ( AVFormatContext s,
int  stream_index,
int64_t  timestamp,
int  flags 
)
static

Definition at line 2051 of file utils.c.

Referenced by av_seek_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 2181 of file utils.c.

Referenced by estimate_timings().

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 2201 of file utils.c.

Referenced by estimate_timings(), and fill_all_stream_timings().

static void fill_all_stream_timings ( AVFormatContext ic)
static

Definition at line 2273 of file utils.c.

Referenced by estimate_timings(), and estimate_timings_from_pts().

static void estimate_timings_from_bit_rate ( AVFormatContext ic)
static

Definition at line 2292 of file utils.c.

Referenced by estimate_timings().

static void estimate_timings_from_pts ( AVFormatContext ic,
int64_t  old_offset 
)
static

Definition at line 2342 of file utils.c.

Referenced by estimate_timings().

static void estimate_timings ( AVFormatContext ic,
int64_t  old_offset 
)
static

Definition at line 2468 of file utils.c.

Referenced by avformat_find_stream_info().

static int has_codec_parameters ( AVStream st,
const char **  errmsg_ptr 
)
static

Definition at line 2515 of file utils.c.

Referenced by avformat_find_stream_info(), and try_decode_frame().

static int try_decode_frame ( AVFormatContext s,
AVStream st,
AVPacket avpkt,
AVDictionary **  options 
)
static

Definition at line 2563 of file utils.c.

Referenced by avformat_find_stream_info().

unsigned int ff_codec_get_tag ( const AVCodecTag tags,
enum AVCodecID  id 
)
enum AVCodecID ff_codec_get_id ( const AVCodecTag tags,
unsigned int  tag 
)
enum AVCodecID ff_get_pcm_codec_id ( int  bps,
int  flt,
int  be,
int  sflags 
)

Select a PCM codec based on the given parameters.

Parameters
bpsbits-per-sample
fltfloating-point
bebig-endian
sflagssigned flags. each bit corresponds to one byte of bit depth. e.g. the 1st bit indicates if 8-bit should be signed or unsigned, the 2nd bit indicates if 16-bit should be signed or unsigned, etc... This is useful for formats such as WAVE where only 8-bit is unsigned and all other bit depths are signed.
Returns
a PCM codec id or AV_CODEC_ID_NONE

Definition at line 2670 of file utils.c.

Referenced by avr_read_header(), ff_mov_get_lpcm_codec_id(), ff_wav_codec_get_id(), get_codec_data(), nist_read_header(), and pvf_read_header().

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

Definition at line 2714 of file utils.c.

int av_codec_get_tag2 ( const AVCodecTag *const *  tags,
enum AVCodecID  id,
unsigned int *  tag 
)

Definition at line 2722 of file utils.c.

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

Definition at line 2739 of file utils.c.

static void compute_chapters_end ( AVFormatContext s)
static

Definition at line 2750 of file utils.c.

Referenced by avformat_find_stream_info().

static int get_std_framerate ( int  i)
static

Definition at line 2774 of file utils.c.

Referenced by avformat_find_stream_info(), ff_rfps_add_frame(), and ff_rfps_calculate().

static int tb_unreliable ( AVCodecContext c)
static

Definition at line 2788 of file utils.c.

Referenced by avformat_find_stream_info(), and ff_rfps_calculate().

int ff_alloc_extradata ( AVCodecContext avctx,
int  size 
)
int ff_get_extradata ( AVCodecContext avctx,
AVIOContext pb,
int  size 
)
int ff_rfps_add_frame ( AVFormatContext ic,
AVStream st,
int64_t  dts 
)

add frame for rfps calculation.

Parameters
dtstimestamp of the i-th frame
Returns
0 if OK, AVERROR_xxx on error

Definition at line 2838 of file utils.c.

Referenced by avformat_find_stream_info(), and mov_build_index().

void ff_rfps_calculate ( AVFormatContext ic)

Definition at line 2896 of file utils.c.

Referenced by avformat_find_stream_info(), and mov_read_header().

void ff_free_stream ( AVFormatContext s,
AVStream st 
)

Definition at line 3501 of file utils.c.

Referenced by avformat_free_context(), and ff_rm_read_mdpr_codecdata().

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
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 3683 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 ff_program_add_stream_index ( AVFormatContext ac,
int  progid,
unsigned  idx 
)

Definition at line 3713 of file utils.c.

uint64_t ff_ntp_time ( void  )

Get the current time since NTP epoch in microseconds.

Definition at line 3741 of file utils.c.

Referenced by rtp_write_header(), rtp_write_packet(), and rtp_write_trailer().

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.

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 3891 of file utils.c.

Referenced by parse_fmtp_config(), and parse_playlist().

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

Set the time base and wrapping info for a given stream.

This will be used to interpret the stream's timestamps. If the new time base is invalid (numerator or denominator are non-positive), it leaves the stream unchanged.

Parameters
sstream
pts_wrap_bitsnumber of bits effectively used by the pts (used for wrap control)
pts_numtime base numerator
pts_dentime base denominator

Definition at line 3919 of file utils.c.

Referenced by add_av_stream1(), adp_read_header(), adts_aac_read_header(), adx_read_header(), afc_read_header(), aiff_read_header(), aiff_write_header(), amr_read_header(), ape_read_header(), aqt_read_header(), asf_read_stream_properties(), asf_write_header1(), asfrtp_parse_sdp_line(), ass_read_header(), ast_read_header(), audio_read_header(), audio_write_header(), avformat_new_stream(), avi_read_header(), avi_write_header(), avr_read_header(), bfi_read_header(), bmv_read_header(), cdata_read_header(), cdxl_read_packet(), celt_header(), cin_read_header(), cine_read_header(), create_audio_stream(), create_new_audio_stream(), create_stream(), dc1394_read_common(), decklink_setup_audio(), decklink_setup_video(), 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(), epaf_read_header(), fbdev_read_header(), ff_decklink_read_header(), ff_img_read_header(), ff_raw_video_read_header(), ff_rm_read_mdpr_codecdata(), ff_voc_get_packet(), ffm2_read_header(), ffm_read_header(), ffm_write_header(), film_read_header(), flac_header(), flac_read_header(), flv_write_header(), g722_read_header(), g723_1_init(), g729_read_header(), gdigrab_read_header(), get_audio_config(), get_packet_header(), get_video_config(), gif_read_header(), gif_write_header(), grab_read_header(), gsm_read_header(), gxf_header(), gxf_write_header(), hls_read_header(), hls_write_header(), hnm_read_header(), idcin_read_header(), iff_read_header(), ilbc_read_header(), init_muxer(), init_stream(), ipmovie_read_header(), ircam_read_header(), iss_read_header(), jacosub_read_header(), lavfi_read_header(), libquvi_read_header(), lmlm4_read_header(), loas_read_header(), lrc_read_header(), lrc_write_header(), lvf_read_header(), lxf_read_header(), matroska_parse_tracks(), microdvd_read_header(), microdvd_write_header(), mkv_write_track(), 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(), mpl2_read_header(), mpsub_read_header(), msnwc_tcp_read_header(), mtv_read_header(), mv_read_header(), mxf_parse_structural_metadata(), mxf_write_header(), mxg_read_header(), nc_read_header(), new_stream(), nist_read_header(), nsv_parse_NSVs_header(), nut_read_header(), nut_write_header(), nuv_header(), ogg_new_stream(), ogg_write_header(), ogm_dshow_header(), ogm_header(), old_dirac_header(), old_flac_header(), oma_read_header(), opus_header(), parse_audio_var(), parse_strk(), parse_video_var(), parse_vtrk(), pcm_read_header(), pjs_read_header(), pmp_header(), pulse_read_header(), pulse_write_header(), pva_read_header(), pvf_read_header(), qt_rtp_parse_packet(), qtkit_read_header(), r3d_read_red1(), rawvideo_read_header(), read_frame(), read_gab2_sub(), read_header(), read_header_gme(), read_sl_header(), realtext_read_header(), redspark_read_header(), rl2_read_header(), roq_read_packet(), rpl_read_header(), rsd_read_header(), rso_read_header(), sami_read_header(), sbg_read_header(), sdr2_read_header(), seq_read_header(), siff_parse_vbv1(), skeleton_header(), smacker_read_header(), smjpeg_read_header(), smjpeg_write_header(), smush_read_header(), sol_read_header(), sox_read_header(), speex_header(), srt_read_header(), srt_write_header(), str_read_packet(), subviewer1_read_header(), subviewer_read_header(), sup_read_header(), swf_read_packet(), tak_read_header(), tedcaptions_read_header(), theora_header(), thp_read_header(), tmv_read_header(), tta_read_header(), txd_read_header(), v4l2_read_header(), vc1t_read_header(), vc1test_write_header(), vfw_read_header(), vid_read_packet(), vivo_read_header(), vmd_read_header(), vorbis_header(), vp8_header(), vplayer_read_header(), vqf_read_header(), wc3_read_header(), webvtt_read_header(), webvtt_write_header(), write_header(), write_stream_data(), wsaud_read_header(), wsvqa_read_header(), wsvqa_read_packet(), wv_read_header(), x11grab_read_header(), xa_read_header(), xmv_read_header(), xwma_read_header(), yop_read_header(), and yuv4_read_header().

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 3944 of file utils.c.

Referenced by ff_http_auth_handle_header(), and parse_playlist().

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 3998 of file utils.c.

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

int64_t ff_iso8601_to_unix_time ( const char *  datestr)

Convert a date string in ISO8601 format to Unix timestamp.

Definition at line 4007 of file utils.c.

Referenced by dv_init_mux(), gxf_write_umf_material_description(), mkv_write_header(), mov_write_header(), and mxf_write_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 4056 of file utils.c.

Referenced by flv_read_packet(), load_ipmovie_packet(), and swf_read_packet().

int ff_generate_avci_extradata ( AVStream st)

Generate standard extradata for AVC-Intra based on width/height and field order.

Definition at line 4228 of file utils.c.

Referenced by mov_read_trak(), and mxf_parse_structural_metadata().