snow: yuv410 support

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/snowdec.c

@@ -295,6 +295,8 @@ static int decode_header(SnowContext *s){
             s->avctx->pix_fmt= PIX_FMT_YUV420P;
         }else if(s->chroma_h_shift == 0 && s->chroma_v_shift==0){
             s->avctx->pix_fmt= PIX_FMT_YUV444P;
+        }else if(s->chroma_h_shift == 2 && s->chroma_v_shift==2){
+            s->avctx->pix_fmt= PIX_FMT_YUV410P;
         } else {
             av_log(s, AV_LOG_ERROR, "unsupported color subsample mode %d %d\n", s->chroma_h_shift, s->chroma_v_shift);
             s->chroma_h_shift = s->chroma_v_shift = 1;

libavcodec/snowenc.c

@@ -220,7 +220,7 @@ static av_cold int encode_init(AVCodecContext *avctx)
     case PIX_FMT_YUV420P:
 //     case PIX_FMT_GRAY8:
 //    case PIX_FMT_YUV411P:
-//    case PIX_FMT_YUV410P:
+    case PIX_FMT_YUV410P:
         s->colorspace_type= 0;
         break;
 /*    case PIX_FMT_RGB32: