sws: use planarRgbToRgbWrapper only for 8bit per component

The function doesnt support >8bit currently

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

libswscale/swscale_unscaled.c

@@ -932,7 +932,15 @@ void ff_get_unscaled_swscale(SwsContext *c)
         && (!needsDither || (c->flags&(SWS_FAST_BILINEAR|SWS_POINT))))
         c->swScale= rgbToRgbWrapper;
 
-    if (isPlanarRGB(srcFormat) && isPackedRGB(dstFormat))
+#define isByteRGB(f) (             \
+        f == AV_PIX_FMT_RGB32   || \
+        f == AV_PIX_FMT_RGB32_1 || \
+        f == AV_PIX_FMT_RGB24   || \
+        f == AV_PIX_FMT_BGR32   || \
+        f == AV_PIX_FMT_BGR32_1 || \
+        f == AV_PIX_FMT_BGR24)
+
+    if (srcFormat == AV_PIX_FMT_GBRP && isPlanar(srcFormat) && isByteRGB(dstFormat))
         c->swScale = planarRgbToRgbWrapper;
 
     /* bswap 16 bits per pixel/component packed formats */