static void mkv_write_block(AVFormatContext *s, AVIOContext *pb, unsigned int blockid, AVPacket *pkt, int flags) { MatroskaMuxContext *mkv = s->priv_data; AVCodecContext *codec = s->streams[pkt->stream_index]->codec; uint8_t *data = NULL, *side_data = NULL; int offset = 0, size = pkt->size, side_data_size = 0; int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts; uint64_t additional_id = 0; int64_t discard_padding = 0; ebml_master block_group, block_additions, block_more; av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, " "pts %" PRId64 ", dts %" PRId64 ", duration %d, flags %d\n", avio_tell(pb), pkt->size, pkt->pts, pkt->dts, pkt->duration, flags); if (codec->codec_id == AV_CODEC_ID_H264 && codec->extradata_size > 0 && (AV_RB24(codec->extradata) == 1 || AV_RB32(codec->extradata) == 1)) ff_avc_parse_nal_units_buf(pkt->data, &data, &size); else if (codec->codec_id == AV_CODEC_ID_HEVC && codec->extradata_size > 6 && (AV_RB24(codec->extradata) == 1 || AV_RB32(codec->extradata) == 1)) /* extradata is Annex B, assume the bitstream is too and convert it */ ff_hevc_annexb2mp4_buf(pkt->data, &data, &size, 0, NULL); else if (codec->codec_id == AV_CODEC_ID_WAVPACK) { int ret = mkv_strip_wavpack(pkt->data, &data, &size); if (ret < 0) { av_log(s, AV_LOG_ERROR, "Error stripping a WavPack packet.\n"); return; } } else data = pkt->data; if (codec->codec_id == AV_CODEC_ID_PRORES) { /* Matroska specification requires to remove the first QuickTime atom */ size -= 8; offset = 8; } side_data = av_packet_get_side_data(pkt, AV_PKT_DATA_SKIP_SAMPLES, &side_data_size); if (side_data && side_data_size >= 10) { discard_padding = av_rescale_q(AV_RL32(side_data + 4), (AVRational){1, codec->sample_rate}, (AVRational){1, 1000000000}); } side_data = av_packet_get_side_data(pkt, AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL, &side_data_size); if (side_data) { additional_id = AV_RB64(side_data); side_data += 8; side_data_size -= 8; } if ((side_data_size && additional_id == 1) || discard_padding) { block_group = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, 0); blockid = MATROSKA_ID_BLOCK; } put_ebml_id(pb, blockid); put_ebml_num(pb, size + 4, 0); // this assumes stream_index is less than 126 avio_w8(pb, 0x80 | (mkv->is_dash ? mkv->dash_track_number : (pkt->stream_index + 1))); avio_wb16(pb, ts - mkv->cluster_pts); avio_w8(pb, flags); avio_write(pb, data + offset, size); if (data != pkt->data) av_free(data); if (discard_padding) { put_ebml_sint(pb, MATROSKA_ID_DISCARDPADDING, discard_padding); } if (side_data_size && additional_id == 1) { block_additions = start_ebml_master(pb, MATROSKA_ID_BLOCKADDITIONS, 0); block_more = start_ebml_master(pb, MATROSKA_ID_BLOCKMORE, 0); put_ebml_uint(pb, MATROSKA_ID_BLOCKADDID, 1); put_ebml_id(pb, MATROSKA_ID_BLOCKADDITIONAL); put_ebml_num(pb, side_data_size, 0); avio_write(pb, side_data, side_data_size); end_ebml_master(pb, block_more); end_ebml_master(pb, block_additions); } if ((side_data_size && additional_id == 1) || discard_padding) { end_ebml_master(pb, block_group); } }