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Adding support for muxing VP8 Alpha files

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This patch adds support for muxing VP8 Alpha Files. The Alpha channel data is
placed in BlockAdditional element of the matroska container. More information
& exact spec on how this is implemented can be found here: http://goo.gl/wCP1y

Signed-off-by: Vignesh Venkatasubramanian <vigneshv@google.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
pull/18/head
Vignesh Venkatasubramanian 12 years ago committed by Michael Niedermayer
parent 85e8a1169c
commit 8ffcc826b3
1 changed files with 49 additions and 10 deletions
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  1. 59
      libavformat/matroskaenc.c

59
libavformat/matroskaenc.c
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@ -662,6 +662,12 @@ static int mkv_write_tracks(AVFormatContext *s)
put_ebml_uint(pb, MATROSKA_ID_VIDEOSTEREOMODE, st_mode);
}
if ((tag = av_dict_get(st->metadata, "alpha_mode", NULL, 0)) ||
(tag = av_dict_get( s->metadata, "alpha_mode", NULL, 0)) ||
(codec->pix_fmt == AV_PIX_FMT_YUVA420P)) {
put_ebml_uint(pb, MATROSKA_ID_VIDEOALPHAMODE, 1);
}
if (st->sample_aspect_ratio.num) {
int64_t d_width = av_rescale(codec->width, st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
if (d_width > INT_MAX) {
@ -1136,9 +1142,10 @@ static void mkv_write_block(AVFormatContext *s, AVIOContext *pb,
{
MatroskaMuxContext *mkv = s->priv_data;
AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
uint8_t *data = NULL;
int offset = 0, size = pkt->size;
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;
av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
"pts %" PRId64 ", dts %" PRId64 ", duration %d, flags %d\n",
@ -1156,14 +1163,46 @@ static void mkv_write_block(AVFormatContext *s, AVIOContext *pb,
offset = 8;
}
put_ebml_id(pb, blockid);
put_ebml_num(pb, size+4, 0);
avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
avio_wb16(pb, ts - mkv->cluster_pts);
avio_w8(pb, flags);
avio_write(pb, data + offset, size);
if (data != pkt->data)
av_free(data);
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) {
ebml_master block_group, block_additions, block_more;
block_group = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, 0);
put_ebml_id(pb, MATROSKA_ID_BLOCK);
put_ebml_num(pb, size+4, 0);
avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // track number
avio_wb16(pb, ts - mkv->cluster_pts);
avio_w8(pb, flags);
avio_write(pb, data + offset, size);
if (data != pkt->data)
av_free(data);
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);
end_ebml_master(pb, block_group);
}
else {
put_ebml_id(pb, blockid);
put_ebml_num(pb, size+4, 0);
avio_w8(pb, 0x80 | (pkt->stream_index + 1)); // this assumes stream_index is less than 126
avio_wb16(pb, ts - mkv->cluster_pts);
avio_w8(pb, flags);
avio_write(pb, data + offset, size);
if (data != pkt->data)
av_free(data);
}
}
static int srt_get_duration(uint8_t **buf)

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