012v decoder.

The decoder also supports a12v, but removes the transparency layer
since no samples with actual transparency are available for testing.

libavcodec/codec_desc.c

@@ -1262,6 +1262,13 @@ static const AVCodecDescriptor codec_descriptors[] = {
         .long_name = NULL_IF_CONFIG_SMALL("Avid 1:1 10-bit RGB Packer"),
         .props     = AV_CODEC_PROP_INTRA_ONLY,
     },
+    {
+        .id        = AV_CODEC_ID_012V,
+        .type      = AVMEDIA_TYPE_VIDEO,
+        .name      = "012v",
+        .long_name = NULL_IF_CONFIG_SMALL("Uncompressed 4:2:2 10-bit"),
+        .props     = AV_CODEC_PROP_INTRA_ONLY,
+    },
     {
         .id        = AV_CODEC_ID_G2M,
         .type      = AVMEDIA_TYPE_VIDEO,