static int mp3_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags) { MP3DecContext *mp3 = s->priv_data; AVIndexEntry *ie, ie1; AVStream *st = s->streams[0]; int64_t ret = av_index_search_timestamp(st, timestamp, flags); int64_t best_pos; int fast_seek = (s->flags & AVFMT_FLAG_FAST_SEEK) ? 1 : 0; int64_t filesize = mp3->header_filesize; if (mp3->usetoc == 2) return -1; // generic index code if (filesize <= 0) { int64_t size = avio_size(s->pb); if (size > 0 && size > s->internal->data_offset) filesize = size - s->internal->data_offset; } if ( (mp3->is_cbr || fast_seek) && (mp3->usetoc == 0 || !mp3->xing_toc) && st->duration > 0 && filesize > 0) { ie = &ie1; timestamp = av_clip64(timestamp, 0, st->duration); ie->timestamp = timestamp; ie->pos = av_rescale(timestamp, filesize, st->duration) + s->internal->data_offset; } else if (mp3->xing_toc) { if (ret < 0) return ret; ie = &st->index_entries[ret]; } else { return -1; } best_pos = mp3_sync(s, ie->pos, flags); if (best_pos < 0) return best_pos; if (mp3->is_cbr && ie == &ie1 && mp3->frames) { int frame_duration = av_rescale(st->duration, 1, mp3->frames); ie1.timestamp = frame_duration * av_rescale(best_pos - s->internal->data_offset, mp3->frames, mp3->header_filesize); } ff_update_cur_dts(s, st, ie->timestamp); return 0; }