ffmpeg_dxva2: support vp9 hwaccel

ffmpeg_dxva2.c

@@ -53,6 +53,7 @@ DEFINE_GUID(DXVADDI_Intel_ModeH264_E, 0x604F8E68, 0x4951,0x4C54,0x88,0xFE,0xAB,0
 DEFINE_GUID(DXVA2_ModeVC1_D,          0x1b81beA3, 0xa0c7,0x11d3,0xb9,0x84,0x00,0xc0,0x4f,0x2e,0x73,0xc5);
 DEFINE_GUID(DXVA2_ModeVC1_D2010,      0x1b81beA4, 0xa0c7,0x11d3,0xb9,0x84,0x00,0xc0,0x4f,0x2e,0x73,0xc5);
 DEFINE_GUID(DXVA2_ModeHEVC_VLD_Main,  0x5b11d51b, 0x2f4c,0x4452,0xbc,0xc3,0x09,0xf2,0xa1,0x16,0x0c,0xc0);
+DEFINE_GUID(DXVA2_ModeVP9_VLD_Profile0, 0x463707f8, 0xa1d0,0x4585,0x87,0x6d,0x83,0xaa,0x6d,0x60,0xb8,0x9e);
 DEFINE_GUID(DXVA2_NoEncrypt,          0x1b81beD0, 0xa0c7,0x11d3,0xb9,0x84,0x00,0xc0,0x4f,0x2e,0x73,0xc5);
 DEFINE_GUID(GUID_NULL,                0x00000000, 0x0000,0x0000,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00);
 
@@ -84,6 +85,9 @@ static const dxva2_mode dxva2_modes[] = {
     /* HEVC/H.265 */
     { &DXVA2_ModeHEVC_VLD_Main,  AV_CODEC_ID_HEVC },
 
+    /* VP8/9 */
+    { &DXVA2_ModeVP9_VLD_Profile0, AV_CODEC_ID_VP9 },
+
     { NULL,                      0 },
 };
 
@@ -543,6 +547,8 @@ static int dxva2_create_decoder(AVCodecContext *s)
     /* add surfaces based on number of possible refs */
     if (s->codec_id == AV_CODEC_ID_H264 || s->codec_id == AV_CODEC_ID_HEVC)
         ctx->num_surfaces += 16;
+    else if (s->codec_id == AV_CODEC_ID_VP9)
+        ctx->num_surfaces += 8;
     else
         ctx->num_surfaces += 2;