static int mpsub_read_header(AVFormatContext *s)
{
MPSubContext *mpsub = s->priv_data;
AVStream *st;
AVBPrint buf;
AVRational pts_info = (AVRational){ 100, 1 }; // ts based by default
int res = 0;
float multiplier = 100.0;
float current_pts = 0;
av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED);
while (!url_feof(s->pb)) {
char line[1024];
float start, duration;
int fps, len = ff_get_line(s->pb, line, sizeof(line));
if (!len)
break;
line[strcspn(line, "\r\n")] = 0;
if (sscanf(line, "FORMAT=%d", &fps) == 1 && fps > 3 && fps < 100) {
/* frame based timing */
pts_info = (AVRational){ fps, 1 };
multiplier = 1.0;
} else if (sscanf(line, "%f %f", &start, &duration) == 2) {
AVPacket *sub;
const int64_t pos = avio_tell(s->pb);
ff_subtitles_read_chunk(s->pb, &buf);
if (buf.len) {
sub = ff_subtitles_queue_insert(&mpsub->q, buf.str, buf.len, 0);
if (!sub) {
res = AVERROR(ENOMEM);
goto end;
}
sub->pts = (int64_t)(current_pts + start*multiplier);
sub->duration = (int)(duration * multiplier);
current_pts += (start + duration) * multiplier;
sub->pos = pos;
}
}
}
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
avpriv_set_pts_info(st, 64, pts_info.den, pts_info.num);
st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
st->codec->codec_id = AV_CODEC_ID_TEXT;
ff_subtitles_queue_finalize(&mpsub->q);
end:
av_bprint_finalize(&buf, NULL);
return res;
}
static int webvtt_read_header(AVFormatContext *s)
{
WebVTTContext *webvtt = s->priv_data;
AVBPrint header, cue;
int res = 0;
AVStream *st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
avpriv_set_pts_info(st, 64, 1, 1000);
st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
st->codec->codec_id = AV_CODEC_ID_WEBVTT;
av_bprint_init(&header, 0, AV_BPRINT_SIZE_UNLIMITED);
av_bprint_init(&cue, 0, AV_BPRINT_SIZE_UNLIMITED);
for (;;) {
int i;
int64_t pos;
AVPacket *sub;
const char *p, *identifier;
//const char *settings = NULL;
int64_t ts_start, ts_end;
ff_subtitles_read_chunk(s->pb, &cue);
if (!cue.len)
break;
p = identifier = cue.str;
pos = avio_tell(s->pb);
/* ignore header chunk */
if (!strncmp(p, "\xEF\xBB\xBFWEBVTT", 9) ||
!strncmp(p, "WEBVTT", 6))
continue;
/* optional cue identifier (can be a number like in SRT or some kind of
* chaptering id), silently skip it */
for (i = 0; p[i] && p[i] != '\n'; i++) {
if (!strncmp(p + i, "-->", 3)) {
identifier = NULL;
break;
}
}
if (identifier)
p += strcspn(p, "\n");
/* cue timestamps */
if ((ts_start = read_ts(p)) == AV_NOPTS_VALUE)
break;
if (!(p = strstr(p, "-->")))
break;
p += 3;
do p++; while (*p == ' ' || *p == '\t');
if ((ts_end = read_ts(p)) == AV_NOPTS_VALUE)
break;
/* optional cue settings, TODO: store in side_data */
p += strcspn(p, "\n\t ");
while (*p == '\t' || *p == ' ')
p++;
if (*p != '\n') {
//settings = p;
p += strcspn(p, "\n");
}
if (*p == '\n')
p++;
/* create packet */
sub = ff_subtitles_queue_insert(&webvtt->q, p, strlen(p), 0);
if (!sub) {
res = AVERROR(ENOMEM);
goto end;
}
sub->pos = pos;
sub->pts = ts_start;
sub->duration = ts_end - ts_start;
}
ff_subtitles_queue_finalize(&webvtt->q);
end:
av_bprint_finalize(&cue, NULL);
av_bprint_finalize(&header, NULL);
return res;
}
