static int rpl_read_packet(AVFormatContext *s, AVPacket *pkt) { RPLContext *rpl = s->priv_data; AVIOContext *pb = s->pb; AVStream* stream; AVIndexEntry* index_entry; uint32_t ret; if (rpl->chunk_part == s->nb_streams) { rpl->chunk_number++; rpl->chunk_part = 0; } stream = s->streams[rpl->chunk_part]; if (rpl->chunk_number >= stream->nb_index_entries) return AVERROR_EOF; index_entry = &stream->index_entries[rpl->chunk_number]; if (rpl->frame_in_part == 0) if (avio_seek(pb, index_entry->pos, SEEK_SET) < 0) return AVERROR(EIO); if (stream->codec->codec_type == AVMEDIA_TYPE_VIDEO && stream->codec->codec_tag == 124) { // We have to split Escape 124 frames because there are // multiple frames per chunk in Escape 124 samples. uint32_t frame_size; avio_skip(pb, 4); /* flags */ frame_size = avio_rl32(pb); if (avio_seek(pb, -8, SEEK_CUR) < 0) return AVERROR(EIO); ret = av_get_packet(pb, pkt, frame_size); if (ret != frame_size) { av_free_packet(pkt); return AVERROR(EIO); } pkt->duration = 1; pkt->pts = index_entry->timestamp + rpl->frame_in_part; pkt->stream_index = rpl->chunk_part; rpl->frame_in_part++; if (rpl->frame_in_part == rpl->frames_per_chunk) { rpl->frame_in_part = 0; rpl->chunk_part++; } } else { ret = av_get_packet(pb, pkt, index_entry->size); if (ret != index_entry->size) { av_free_packet(pkt); return AVERROR(EIO); } if (stream->codec->codec_type == AVMEDIA_TYPE_VIDEO) { // frames_per_chunk should always be one here; the header // parsing will warn if it isn't. pkt->duration = rpl->frames_per_chunk; } else { // All the audio codecs supported in this container // (at least so far) are constant-bitrate. pkt->duration = ret * 8; } pkt->pts = index_entry->timestamp; pkt->stream_index = rpl->chunk_part; rpl->chunk_part++; } // None of the Escape formats have keyframes, and the ADPCM // format used doesn't have keyframes. if (rpl->chunk_number == 0 && rpl->frame_in_part == 0) pkt->flags |= AV_PKT_FLAG_KEY; return ret; }