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libvpx: Enable vp9 alpha encoding 

Chrome canary now supports decoding of VP9 streams with alpha
channel [1]. Add support to ffmpeg for creating such files.

[1] https://codereview.chromium.org/2096813002/

Reviewed-by: James Zern <jzern@google.com>
Signed-off-by: Vignesh Venkatasubramanian <vigneshv@google.com>
This commit is contained in:
Vignesh Venkatasubramanian 2016-06-30 16:16:31 -07:00 committed by James Zern
parent 7af44ce2f7
commit acca56d962
2 changed files with 4 additions and 0 deletions
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3
libavcodec/libvpx.c
View File

@ -29,12 +29,14 @@
static const enum AVPixelFormat vp9_pix_fmts_def[] = {
AV_PIX_FMT_YUV420P,
AV_PIX_FMT_YUVA420P,
AV_PIX_FMT_NONE
};
#if CONFIG_LIBVPX_VP9_ENCODER
static const enum AVPixelFormat vp9_pix_fmts_highcol[] = {
AV_PIX_FMT_YUV420P,
AV_PIX_FMT_YUVA420P,
AV_PIX_FMT_YUV422P,
AV_PIX_FMT_YUV440P,
AV_PIX_FMT_YUV444P,
@ -46,6 +48,7 @@ static const enum AVPixelFormat vp9_pix_fmts_highcol[] = {
static const enum AVPixelFormat vp9_pix_fmts_highbd[] = {
AV_PIX_FMT_YUV420P,
AV_PIX_FMT_YUVA420P,
AV_PIX_FMT_YUV422P,
AV_PIX_FMT_YUV440P,
AV_PIX_FMT_YUV444P,

1
libavcodec/libvpxenc.c
View File

@ -284,6 +284,7 @@ static int set_pix_fmt(AVCodecContext *avctx, vpx_codec_caps_t codec_caps,
#endif
switch (avctx->pix_fmt) {
case AV_PIX_FMT_YUV420P:
case AV_PIX_FMT_YUVA420P:
enccfg->g_profile = 0;
*img_fmt = VPX_IMG_FMT_I420;
return 0;