+static int read_seek2(AVFormatContext *s, int stream_index,
+ int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
+{
+ ASSContext *ass = s->priv_data;
+
+ if (flags & AVSEEK_FLAG_BYTE) {
+ return AVERROR(ENOSYS);
+ } else if (flags & AVSEEK_FLAG_FRAME) {
+ if (ts < 0 || ts >= ass->event_count)
+ return AVERROR(ERANGE);
+ ass->event_index = ts;
+ } else {
+ int i, idx = -1;
+ int64_t min_ts_diff = INT64_MAX;
+ if (stream_index == -1) {
+ AVRational time_base = s->streams[0]->time_base;
+ ts = av_rescale_q(ts, AV_TIME_BASE_Q, time_base);
+ min_ts = av_rescale_rnd(min_ts, time_base.den,
+ time_base.num * (int64_t)AV_TIME_BASE,
+ AV_ROUND_UP);
+ max_ts = av_rescale_rnd(max_ts, time_base.den,
+ time_base.num * (int64_t)AV_TIME_BASE,
+ AV_ROUND_DOWN);
+ }
+ /* TODO: ass->event[] is sorted by pts so we could do a binary search */
+ for (i=0; i<ass->event_count; i++) {
+ int64_t pts = get_pts(ass->event[i]);
+ int64_t ts_diff = FFABS(pts - ts);
+ if (pts >= min_ts && pts <= max_ts && ts_diff < min_ts_diff) {
+ min_ts_diff = ts_diff;
+ idx = i;
+ }
+ }
+ if (idx < 0)
+ return AVERROR(ERANGE);
+ ass->event_index = idx;
+ }
+ return 0;
+}
+
+AVInputFormat ff_ass_demuxer = {
+ .name = "ass",
+ .long_name = NULL_IF_CONFIG_SMALL("SSA (SubStation Alpha) subtitle"),
+ .priv_data_size = sizeof(ASSContext),
+ .read_probe = probe,
+ .read_header = read_header,
+ .read_packet = read_packet,
+ .read_close = read_close,
+ .read_seek2 = read_seek2,