implement basic C yuv422toRGB function

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@29306 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/add-ons/media/plugins/avcodec/gfx_conv_c.cpp

@@ -268,3 +268,64 @@ void gfx_conv_YCbCr420p_RGB32_c(AVFrame *in, AVFrame *out, int width, int height
 }
 
 #endif
+
+#define CLIP(a) if (0xffffff00 & (uint32)a) { if (a < 0) a = 0; else a = 255; }
+
+// http://en.wikipedia.org/wiki/YUV
+uint32 YUV444TORGBA8888(uint8 y, uint8 u, uint8 v) 
+{
+	uint32 pixel = 0;
+	int32 c, d, e;
+	int32 r,g,b;
+
+	c = y - 16;
+	d = u - 128;
+	e = v - 128;
+	
+   	r = (298 * c + 409 * e + 128) >> 8;
+	g = (298 * c - 100 * d - 208 * e + 128) >> 8;
+   	b = (298 * c + 516 * d + 128) >> 8;
+
+	CLIP(r);
+	CLIP(g);
+	CLIP(b);
+    
+	pixel = (r << 16) | (g << 8) | b;
+	
+	return pixel;
+}
+
+void gfx_conv_YCbCr422_RGB32_c(AVFrame *in, AVFrame *out, int width, int height)
+{
+	uint8 *ybase = (uint8 *)in->data[0];
+	uint8 *ubase = (uint8 *)in->data[1];
+	uint8 *vbase = (uint8 *)in->data[2];
+	
+	uint32 *rgbbase = (uint32 *)out->data[0];
+
+	int uv_index;
+
+	for (uint32 i = 0; i < height; i++) {
+
+		uv_index = 0;
+
+		for (uint32 j=0; j < width; j+=2) {
+			rgbbase[j]   = YUV444TORGBA8888(ybase[j]  ,ubase[uv_index],vbase[uv_index]);
+			rgbbase[j+1] = YUV444TORGBA8888(ybase[j+1],ubase[uv_index],vbase[uv_index]);
+    	
+    		uv_index++;
+		}
+		
+		ybase += in->linesize[0];
+		ubase += in->linesize[1];
+		vbase += in->linesize[2];
+		
+		rgbbase += out->linesize[0] / 4;
+	}
+
+	if (height & 1) {
+		// XXX special case for last line if height not multiple of 2 goes here
+		memset((height - 1) * out->linesize[0] + (uint8 *)out->data[0], 0, width * 4);
+	}
+
+}

src/add-ons/media/plugins/avcodec/gfx_conv_c.h

@@ -14,5 +14,6 @@ void gfx_conv_yuv420p_ycbcr422_c(AVFrame *in, AVFrame *out, int width, int heigh
 void gfx_conv_yuv410p_rgb32_c(AVFrame *in, AVFrame *out, int width, int height);
 void gfx_conv_yuv411p_rgb32_c(AVFrame *in, AVFrame *out, int width, int height);
 void gfx_conv_YCbCr420p_RGB32_c(AVFrame *in, AVFrame *out, int width, int height);
+void gfx_conv_YCbCr422_RGB32_c(AVFrame *in, AVFrame *out, int width, int height);
 
 #endif

src/add-ons/media/plugins/avcodec/gfx_util.cpp

@@ -68,6 +68,10 @@ gfx_convert_func resolve_colorspace(color_space colorSpace, PixelFormat pixelFor
 				}
 			}
 			
+			if (pixelFormat == PIX_FMT_YUV422P || pixelFormat == PIX_FMT_YUVJ422P) {
+				return gfx_conv_YCbCr422_RGB32_c;
+			}
+
 			TRACE("resolve_colorspace: %s => B_RGB32: NULL\n", pixfmt_to_string(pixelFormat));
 			return NULL;
 
@@ -120,7 +124,7 @@ gfx_convert_func resolve_colorspace(color_space colorSpace, PixelFormat pixelFor
 				}
 			}
 			
-			if (pixelFormat == PIX_FMT_YUV422) {
+			if (pixelFormat == PIX_FMT_YUV422 || PIX_FMT_YUVJ422P) {
 				#if INCLUDE_MMX
 				if (mmx) {
 					TRACE("resolve_colorspace: PIX_FMT_YUV422 => B_YCbCr422: gfx_conv_null_mmx\n");
@@ -134,7 +138,7 @@ gfx_convert_func resolve_colorspace(color_space colorSpace, PixelFormat pixelFor
 			}
 			
 			TRACE("resolve_colorspace: %s => B_YCbCr422: NULL\n", pixfmt_to_string(pixelFormat));
-			return NULL;
+			return gfx_conv_null_c;
 		
 		default:
 			TRACE("resolve_colorspace: default: NULL !!!\n");
@@ -159,6 +163,8 @@ const char *pixfmt_to_string(int p)
 		return "PIX_FMT_BGR24";
 	case PIX_FMT_YUV422P:
 		return "PIX_FMT_YUV422P";
+	case PIX_FMT_YUVJ422P:
+		return "PIX_FMT_YUVJ422P - YUV422P (Jpeg)";
 	case PIX_FMT_YUV444P:
 		return "PIX_FMT_YUV444P";
 	case PIX_FMT_RGBA32: