Merge commit 'b183abfb'

* commit 'b183abfb':
  vpx: Support color range

Decoder chunk not merged as the framework automatically copies avctx
color range to the frame color range. And we already set the avctx field
since cbcc88c0.

Merged-by: Clément Bœsch <cboesch@gopro.com>

libavcodec/libvpxenc.c

@@ -1020,6 +1020,16 @@ static int vpx_encode(AVCodecContext *avctx, AVPacket *pkt,
             rawimg_alpha->stride[VPX_PLANE_V] = frame->linesize[2];
         }
         timestamp                   = frame->pts;
+#if VPX_IMAGE_ABI_VERSION >= 4
+        switch (frame->color_range) {
+        case AVCOL_RANGE_MPEG:
+            rawimg->range = VPX_CR_STUDIO_RANGE;
+            break;
+        case AVCOL_RANGE_JPEG:
+            rawimg->range = VPX_CR_FULL_RANGE;
+            break;
+        }
+#endif
         if (frame->pict_type == AV_PICTURE_TYPE_I)
             flags |= VPX_EFLAG_FORCE_KF;
     }