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>
FFmpeg · Jul 13, 2016 · acca56d9629b7fc158ce188190d22314c3d92c39 · acca56d
1 parent 7af44ce
commit acca56d9629b7fc158ce188190d22314c3d92c39
Unified Split

Showing with 4 additions and 0 deletions.

+3 −0 libavcodec/libvpx.c

+1 −0 libavcodec/libvpxenc.c
diff --git a/libavcodec/libvpx.c b/libavcodec/libvpx.c
@@ -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,

diff --git a/libavcodec/libvpxenc.c b/libavcodec/libvpxenc.c
@@ -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;