FFmpeg: libavformat/internal.h File Reference

void ff_sdp_write_media (char *buff, int size, AVStream *st, int idx, const char *dest_addr, const char *dest_type, int port, int ttl, AVFormatContext *fmt)

Append the media-specific SDP fragment for the media stream c to the buffer buff.

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.

int ff_get_v_length (uint64_t val)

Get the length in bytes which is needed to store val as v.

void ff_put_v (AVIOContext *bc, uint64_t val)

Put val using a variable number of bytes.

int ff_get_line (AVIOContext *s, char *buf, int maxlen)

Read a whole line of text from AVIOContext.

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.

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 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.

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

Add a new chapter.

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.

enum AVCodecID ff_guess_image2_codec (const char *filename)

int64_t ff_iso8601_to_unix_time (const char *datestr)

Convert a date string in ISO8601 format to Unix timestamp.

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().

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.

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().

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.

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.

int ff_framehash_write_header (AVFormatContext *s)

Set the timebase for each stream from the corresponding codec timebase and print it.

int ff_read_packet (AVFormatContext *s, AVPacket *pkt)

Read a transport packet from a media file.

int ff_interleave_packet_per_dts (AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush)

Interleave a packet per dts in an output media file.

void ff_free_stream (AVFormatContext *s, AVStream *st)

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

Return the frame duration in seconds.

int ff_get_audio_frame_size (AVCodecContext *enc, int size, int mux)

Get the number of samples of an audio frame.

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.

AVRational ff_choose_timebase (AVFormatContext *s, AVStream *st, int min_precission)

Chooses a timebase for muxing the specified stream.

void ff_generate_avci_extradata (AVStream *st)

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

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.

Macro Definition Documentation

#define MAX_URL_SIZE 4096

Definition at line 27 of file internal.h.

Referenced by ftp_open(), http_open_cnx(), http_read_header(), libssh_open(), open_input(), parse_playlist(), and process_line().

#define PROBE_BUF_MIN 2048

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

Definition at line 30 of file internal.h.

Referenced by av_probe_input_buffer2().

#define PROBE_BUF_MAX (1<<20)

Definition at line 31 of file internal.h.

Referenced by av_probe_input_buffer2(), and mp3_read_probe().

#define hex_dump_debug ( class,

buf,

size

)

Definition at line 36 of file internal.h.

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

#define dynarray_add ( tab,

nb_ptr,

elem

)

Value:

do {\

av_dynarray_add((tab), nb_ptr, (elem));\

} while(0)

Definition at line 58 of file internal.h.

Referenced by av_new_program(), avpriv_new_chapter(), ff_rtsp_setup_output_streams(), matroska_parse_frame(), matroska_parse_rm_audio(), matroska_parse_webvtt(), mpegts_add_service(), new_variant(), parse_playlist(), and rtp_parse_addr_list().

#define NTP_OFFSET 2208988800ULL

Definition at line 90 of file internal.h.

#define NTP_OFFSET_US (NTP_OFFSET * 1000000ULL)

Definition at line 91 of file internal.h.

Referenced by ff_ntp_time(), and rtp_write_header().

#define SPACE_CHARS " \t\r\n"

Definition at line 155 of file internal.h.

Referenced by concat_read_header(), ff_hex_to_data(), get_keyword(), get_word(), get_word_until_chars(), process_line(), and rtsp_parse_range_npt().

Typedef Documentation

typedef void(* ff_parse_key_val_cb)(void *context, const char *key, int key_len, char **dest, int *dest_len)

Callback function type for ff_parse_key_value.

Parameters: key a pointer to the key

key_len the number of bytes that belong to the key, including the '=' char

dest return the destination pointer for the value in *dest, may be null to ignore the value

dest_len the length of the *dest buffer

Definition at line 167 of file internal.h.

Function Documentation

struct tm* ff_brktimegm ( time_t secs,

struct tm * tm

)

read

Definition at line 29 of file cutils.c.

Referenced by dv_write_pack().

char* ff_data_to_hex ( char * buf,

const uint8_t * src,

int size,

int lowercase

)

Definition at line 3865 of file utils.c.

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

int ff_hex_to_data ( uint8_t * data,

const char * p

)

Parse a string of hexadecimal strings.

Any space between the hexadecimal digits is ignored.

Parameters: data if non-null, the parsed data is written to this pointer

p the string to parse

Returns: the number of bytes written (or to be written, if data is null)

Definition at line 3886 of file utils.c.

Referenced by parse_fmtp_config(), and parse_playlist().

void ff_program_add_stream_index ( AVFormatContext * ac,

int progid,

unsigned int idx

)

Definition at line 3459 of file utils.c.

Referenced by hls_read_header(), and pmt_cb().

int ff_interleave_add_packet ( AVFormatContext * s,

AVPacket * pkt,

int(*)(AVFormatContext *, AVPacket *, AVPacket *) compare

)

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

Returns: 0, or < 0 on error

Definition at line 580 of file mux.c.

Referenced by ff_audio_rechunk_interleave(), and ff_interleave_packet_per_dts().

void ff_read_frame_flush ( AVFormatContext * s )

Flush the frame reader.

Definition at line 1567 of file utils.c.

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

uint64_t ff_ntp_time ( void )

Get the current time since NTP epoch in microseconds.

Definition at line 3665 of file utils.c.

Referenced by rtp_write_header(), and rtp_write_packet().

void ff_sdp_write_media ( char * buff,

int size,

AVStream * st,

int idx,

const char * dest_addr,

const char * dest_type,

int port,

int ttl,

AVFormatContext * fmt

)

Append the media-specific SDP fragment for the media stream c to the buffer buff.

Note, the buffer needs to be initialized, since it is appended to existing content.

Parameters: buff the buffer to append the SDP fragment to

size the size of the buff buffer

st the AVStream of the media to describe

idx the global stream index

dest_addr the destination address of the media stream, may be NULL

dest_type the destination address type, may be NULL

port the destination port of the media stream, 0 if unknown

ttl the time to live of the stream, 0 if not multicast

fmt the AVFormatContext, which might contain options modifying the generated SDP

Definition at line 708 of file sdp.c.

Referenced by mov_write_udta_sdp().

int ff_write_chained ( AVFormatContext * dst,

int dst_stream,

AVPacket * pkt,

AVFormatContext * src

)

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

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

Parameters: dst the muxer to write the packet to

dst_stream the stream index within dst to write the packet to

pkt the packet to be written

src the muxer the packet originally was intended for

Returns: the value av_write_frame returned

Definition at line 851 of file mux.c.

Referenced by ff_mov_add_hinted_packet(), hls_write_packet(), ism_write_packet(), rtsp_write_packet(), sap_write_packet(), and seg_write_packet().

int ff_get_v_length ( uint64_t val )

Get the length in bytes which is needed to store val as v.

Definition at line 335 of file aviobuf.c.

Referenced by ff_put_v(), and nut_write_packet().

void ff_put_v ( AVIOContext * bc,

uint64_t val

)

Put val using a variable number of bytes.

Definition at line 345 of file aviobuf.c.

Referenced by nut_write_packet(), put_packet(), put_s(), put_str(), put_tt(), write_chapter(), write_globalinfo(), write_index(), write_mainheader(), write_streamheader(), and write_streaminfo().

int ff_get_line ( AVIOContext * s,

char * buf,

int maxlen

)

Read a whole line of text from AVIOContext.

Stop reading after reaching either a \n, a 0円 or EOF. The returned string is always 0円-terminated, and may be truncated if the buffer is too small.

Parameters: s the read-only AVIOContext

buf buffer to store the read line

maxlen size of the buffer

Returns: the length of the string written in the buffer, not including the final 0円

Definition at line 632 of file aviobuf.c.

Referenced by aqt_read_header(), concat_read_header(), jacosub_read_header(), microdvd_read_header(), mpl2_read_header(), mpsub_read_header(), nist_read_header(), pjs_read_header(), pvf_read_header(), read_chomp_line(), subviewer1_read_header(), subviewer_read_header(), and vplayer_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: str the string to parse

callback_get_buf function that returns where to store the unescaped value string.

context the opaque context pointer to pass to callback_get_buf

Definition at line 3941 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 3995 of file utils.c.

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

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 1684 of file utils.c.

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

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 1620 of file utils.c.

Referenced by av_add_index_entry(), and read_header().

AVChapter* avpriv_new_chapter ( AVFormatContext * s,

int id,

AVRational time_base,

int64_t start,

int64_t end,

const char * title

)

Add a new chapter.

Parameters: s media file handle

id unique ID for this chapter

start chapter start time in time_base units

end chapter end time in time_base units

title chapter title

Returns: AVChapter or NULL on error

Definition at line 3435 of file utils.c.

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

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 1607 of file utils.c.

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

enum AVCodecID ff_guess_image2_codec ( const char * filename )

Definition at line 99 of file img2.c.

Referenced by ape_tag_read_field(), av_guess_codec(), av_guess_format(), img_read_header(), and img_read_probe().

int64_t ff_iso8601_to_unix_time ( const char * datestr )

Convert a date string in ISO8601 format to Unix timestamp.

Definition at line 4005 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_seek_frame_binary ( AVFormatContext * s,

int stream_index,

int64_t target_ts,

int flags

)

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

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

stream_index stream number

Definition at line 1734 of file utils.c.

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

void ff_update_cur_dts ( AVFormatContext * s,

AVStream * ref_st,

int64_t timestamp

)

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

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

Parameters: timestamp new dts expressed in time_base of param ref_st

ref_st reference stream giving time_base of param timestamp

Definition at line 1594 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().

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 1796 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_ts target timestamp in the time base of the given stream

stream_index stream number

Definition at line 1832 of file utils.c.

Referenced by ff_seek_frame_binary(), and read_seek().

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: s stream

pts_wrap_bits number of bits effectively used by the pts (used for wrap control)

pts_num time base numerator

pts_den time base denominator

Definition at line 3922 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(), create_audio_stream(), create_new_audio_stream(), create_stream(), dc1394_read_common(), 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_framehash_write_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(), get_packet_header(), gif_read_header(), gif_write_header(), grab_read_header(), gsm_read_header(), gxf_header(), gxf_write_header(), hls_read_header(), idcin_read_header(), iff_read_header(), ilbc_read_header(), img_read_header(), 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(), lvf_read_header(), lxf_read_header(), matroska_read_header(), microdvd_read_header(), microdvd_write_header(), mkv_write_tracks(), mmf_read_header(), modplug_read_header(), mov_read_trak(), mov_write_header(), mp3_read_header(), mpc8_read_header(), mpc_read_header(), mpeg_mux_init(), mpegts_read_header(), mpegts_set_stream_info(), mpegts_write_header(), 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(), 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(), 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(), swf_read_packet(), tak_read_header(), tedcaptions_read_header(), 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_packet(), vivo_read_header(), vmd_read_header(), vorbis_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().

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 4052 of file utils.c.

Referenced by flv_read_packet(), and load_ipmovie_packet().

int ff_framehash_write_header ( AVFormatContext * s )

Set the timebase for each stream from the corresponding codec timebase and print it.

Definition at line 23 of file framehash.c.

int ff_read_packet ( AVFormatContext * s,

AVPacket * pkt

)

Read a transport packet from a media file.

Parameters: s media file handle

pkt is filled

Returns: 0 if OK, AVERROR_xxx on error

Definition at line 649 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().

int ff_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: s media file handle

out the interleaved packet will be output here

pkt the input packet

flush 1 if no further packets are available as input and all remaining packets should be output

Returns: 1 if a packet was output, 0 if no packet could be output, < 0 if an error occurred

Definition at line 673 of file mux.c.

Referenced by gxf_interleave_packet(), and interleave_packet().

void ff_free_stream ( AVFormatContext * s,

AVStream * st

)

Definition at line 3249 of file utils.c.

Referenced by avformat_free_context(), and ff_rm_read_mdpr_codecdata().

void ff_compute_frame_duration ( int * pnum,

int * pden,

AVStream * st,

AVCodecParserContext * pc,

AVPacket * pkt

)

Return the frame duration in seconds.

Return 0 if not available.

Definition at line 781 of file utils.c.

Referenced by compute_pkt_fields(), and compute_pkt_fields2().

int ff_get_audio_frame_size ( AVCodecContext * enc,

int size,

int mux

)

Get the number of samples of an audio frame.

Return -1 on error.

Definition at line 752 of file utils.c.

Referenced by compute_pkt_fields2(), and ff_compute_frame_duration().

unsigned int ff_codec_get_tag ( const AVCodecTag * tags,

enum AVCodecID id

)

Definition at line 2546 of file utils.c.

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

enum AVCodecID ff_codec_get_id ( const AVCodecTag * tags,

unsigned int tag

)

Definition at line 2556 of file utils.c.

Referenced by asf_read_stream_properties(), ast_read_header(), av_codec_get_id(), avi_read_header(), create_new_audio_stream(), decode_stream_header(), dshow_add_device(), dshow_cycle_formats(), ff_mp4_read_dec_config_descr(), ff_rm_read_mdpr_codecdata(), ff_voc_get_packet(), ff_wav_codec_get_id(), get_aiff_header(), get_codec_data(), ircam_read_header(), lvf_read_header(), lxf_read_header(), matroska_read_header(), mov_codec_id(), mov_skip_multiple_stsd(), nsv_parse_NSVs_header(), nut_read_header(), ogm_dshow_header(), ogm_header(), oma_read_header(), parse_media_type(), read_desc_chunk(), read_header(), rm_read_audio_stream_info(), rsd_read_header(), rso_read_header(), smjpeg_read_header(), and swf_read_packet().

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: bps bits-per-sample

flt floating-point

be big-endian

sflags signed 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 2570 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().

AVRational ff_choose_timebase ( AVFormatContext * s,

AVStream * st,

int min_precission

)

Chooses a timebase for muxing the specified stream.

The choosen timebase allows sample accurate timestamps based on the framerate or sample rate for audio streams. It also is at least as precisse as 1/min_precission would be.

Definition at line 105 of file mux.c.

Referenced by nut_write_header().

void ff_generate_avci_extradata ( AVStream * st )

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

Definition at line 4194 of file utils.c.

Referenced by mov_read_trak(), and mxf_parse_structural_metadata().

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.

Parameters: size size of extradata

Returns: 0 if OK, AVERROR_xxx on error

Definition at line 2690 of file utils.c.

Referenced by adx_read_header(), afc_read_header(), aiff_read_header(), apc_read_header(), ape_read_header(), ape_tag_read_field(), avformat_find_stream_info(), avi_read_header(), celt_header(), decode_stream_header(), dfa_read_header(), encode_intervals(), ff_generate_avci_extradata(), ff_get_wav_header(), ff_mp4_read_dec_config_descr(), ff_parse_mpeg2_descriptor(), ffm2_read_header(), ffm_read_header(), flac_header(), flv_get_extradata(), flv_set_video_codec(), get_codec_data(), idcin_read_header(), matroska_read_header(), mov_create_chapter_track(), mov_parse_stsd_data(), mov_read_dvc1(), mov_read_glbl(), mov_read_strf(), mov_read_wave(), mpc8_read_header(), mpc_read_header(), mxf_parse_structural_metadata(), nut_read_header(), ogm_header(), oma_read_header(), opus_header(), parse_fmtp_config(), parse_packed_headers(), qdm2_parse_config(), read_header(), read_kuki_chunk(), redspark_read_header(), rl2_read_header(), rm_read_extradata(), rsd_read_header(), smacker_read_header(), smush_read_header(), speex_header(), svq3_parse_packet(), tta_read_header(), vc1t_read_header(), vmd_read_header(), vqf_read_header(), wsvqa_read_header(), wsvqa_read_packet(), xmv_process_packet_header(), and yop_read_header().

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