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Adding support for muxing VP8 Alpha files 

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>
This commit is contained in:
Vignesh Venkatasubramanian 2013-05-08 16:59:32 -07:00 committed by Michael Niedermayer
parent 85e8a1169c
commit 8ffcc826b3
1 changed files with 49 additions and 10 deletions
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59
libavformat/matroskaenc.c
View File

@ -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)