webvttdec.c File Reference

#include "avcodec.h"
#include "ass.h"
#include "codec_internal.h"
#include "libavutil/bprint.h"
#include "libavutil/mathematics.h"

Go to the source code of this file.

Functions
static int64_t	parse_webvtt_timestamp (const char *buf)
static int	read_cue_timestamp (const char *body, int len, int64_t cue_start, int64_t cue_end, int64_t prev_ts, int64_t *ts_out)
static void	flush_segment (AVBPrint *buf, AVBPrint *seg, int64_t dur_cs)
static int	webvtt_event_to_ass (AVBPrint *buf, const char *p, int64_t cue_start_ms, int64_t cue_end_ms)
static int	webvtt_decode_frame (AVCodecContext *avctx, AVSubtitle *sub, int *got_sub_ptr, const AVPacket *avpkt)

Variables
struct {
const char *   from
const char *   to
}	webvtt_tag_replace []
struct {
const char   from [6]
const char   to [6]
}	webvtt_valid_tags []
const FFCodec	ff_webvtt_decoder

Detailed Description

WebVTT subtitle decoder

See also

https://www.w3.org/TR/webvtt1/

Todo:

need to support extended markups and cue settings

Definition in file webvttdec.c.

Function Documentation

parse_webvtt_timestamp()

static int64_t parse_webvtt_timestamp ( const char *  buf )

static

Definition at line 54 of file webvttdec.c.

Referenced by read_cue_timestamp().

read_cue_timestamp()

static int read_cue_timestamp ( const char *  body, int  len, int64_t  cue_start, int64_t  cue_end, int64_t  prev_ts, int64_t *  ts_out  )

static

Definition at line 75 of file webvttdec.c.

Referenced by webvtt_event_to_ass().

flush_segment()

static void flush_segment ( AVBPrint *  buf, AVBPrint *  seg, int64_t  dur_cs  )

static

Definition at line 100 of file webvttdec.c.

Referenced by webvtt_event_to_ass().

webvtt_event_to_ass()

static int webvtt_event_to_ass ( AVBPrint *  buf, const char *  p, int64_t  cue_start_ms, int64_t  cue_end_ms  )

static

Definition at line 108 of file webvttdec.c.

Referenced by webvtt_decode_frame().

webvtt_decode_frame()

static int webvtt_decode_frame ( AVCodecContext *  avctx, AVSubtitle *  sub, int *  got_sub_ptr, const AVPacket *  avpkt  )

static

Definition at line 183 of file webvttdec.c.

Variable Documentation

from

const char from[6]

Definition at line 35 of file webvttdec.c.

Referenced by webvtt_event_to_ass().

to

const char to[6]

Definition at line 36 of file webvttdec.c.

Referenced by av_strireplace(), copy_block(), copy_picture_range(), ff_mov_lang_to_iso639(), ff_shuffle_filter_coefficients(), ff_sws_get_adaptation(), ff_sws_pixel_expand(), filter_frame(), magy_huffman_compute_bits(), mjpegenc_huffman_compute_bits(), set_name_slot(), and webvtt_event_to_ass().

webvtt_tag_replace

const { ... } webvtt_tag_replace[]

Initial value:

= {
    {"{", "\\{{}"}, {"\\", "\\\xe2\x81\xa0"}, 
    {"&gt;", ">"}, {"&lt;", "<"},
    {"&lrm;", "\xe2\x80\x8e"}, {"&rlm;", "\xe2\x80\x8f"},
    {"&amp;", "&"}, {"&nbsp;", "\\h"},
}

Referenced by webvtt_event_to_ass().

webvtt_valid_tags

const { ... } webvtt_valid_tags[]

Initial value:

= {
    {"i", "{\\i1}"}, {"/i", "{\\i0}"},
    {"b", "{\\b1}"}, {"/b", "{\\b0}"},
    {"u", "{\\u1}"}, {"/u", "{\\u0}"},
}

Referenced by webvtt_event_to_ass().

ff_webvtt_decoder

const FFCodec ff_webvtt_decoder

Initial value:

= {
    .p.name         = "webvtt",
    CODEC_LONG_NAME("WebVTT subtitle"),
    .p.type         = AVMEDIA_TYPE_SUBTITLE,
    .p.id           = AV_CODEC_ID_WEBVTT,
    FF_CODEC_DECODE_SUB_CB(webvtt_decode_frame),
    .init           = ff_ass_subtitle_header_default,
    .flush          = ff_ass_decoder_flush,
    .priv_data_size = sizeof(FFASSDecoderContext),
}

Definition at line 213 of file webvttdec.c.