static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags) { AVIContext *avi = s->priv_data; AVStream *st; int i, index; int64_t pos, pos_min; AVIStream *ast; if (!avi->index_loaded) { /* we only load the index on demand */ avi_load_index(s); avi->index_loaded = 1; } assert(stream_index>= 0); st = s->streams[stream_index]; ast= st->priv_data; index= av_index_search_timestamp(st, timestamp * FFMAX(ast->sample_size, 1), flags); if(index<0) return -1; /* find the position */ pos = st->index_entries[index].pos; timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1); // av_log(s, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp); if (CONFIG_DV_DEMUXER && avi->dv_demux) { /* One and only one real stream for DV in AVI, and it has video */ /* offsets. Calling with other stream indexes should have failed */ /* the av_index_search_timestamp call above. */ assert(stream_index == 0); /* Feed the DV video stream version of the timestamp to the */ /* DV demux so it can synthesize correct timestamps. */ dv_offset_reset(avi->dv_demux, timestamp); avio_seek(s->pb, pos, SEEK_SET); avi->stream_index= -1; return 0; } pos_min= pos; for(i = 0; i < s->nb_streams; i++) { AVStream *st2 = s->streams[i]; AVIStream *ast2 = st2->priv_data; ast2->packet_size= ast2->remaining= 0; if (ast2->sub_ctx) { seek_subtitle(st, st2, timestamp); continue; } if (st2->nb_index_entries <= 0) continue; // assert(st2->codec->block_align); assert((int64_t)st2->time_base.num*ast2->rate == (int64_t)st2->time_base.den*ast2->scale); index = av_index_search_timestamp( st2, av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1), flags | AVSEEK_FLAG_BACKWARD | (st2->codec->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0)); if(index<0) index=0; ast2->seek_pos= st2->index_entries[index].pos; pos_min= FFMIN(pos_min,ast2->seek_pos); } for(i = 0; i < s->nb_streams; i++) { AVStream *st2 = s->streams[i]; AVIStream *ast2 = st2->priv_data; if (ast2->sub_ctx || st2->nb_index_entries <= 0) continue; index = av_index_search_timestamp( st2, av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1), flags | AVSEEK_FLAG_BACKWARD | (st2->codec->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0)); if(index<0) index=0; while(!avi->non_interleaved && index>0 && st2->index_entries[index-1].pos >= pos_min) index--; ast2->frame_offset = st2->index_entries[index].timestamp; } /* do the seek */ avio_seek(s->pb, pos_min, SEEK_SET); avi->stream_index= -1; avi->dts_max= INT_MIN; return 0; }