In libswscale, use all lines when converting from 422p to rgb with mmx, improve quality.

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

libswscale/x86/yuv2rgb_template.c

@@ -43,17 +43,14 @@
     if (h_size * depth > FFABS(dstStride[0]))                        \
         h_size -= 8;                                                 \
                                                                      \
-    if (c->srcFormat == PIX_FMT_YUV422P) {                           \
-        srcStride[1] *= 2;                                           \
-        srcStride[2] *= 2;                                           \
-    }                                                                \
+    vshift = c->srcFormat != PIX_FMT_YUV422P;                        \
                                                                      \
     __asm__ volatile ("pxor %mm4, %mm4\n\t");                        \
     for (y = 0; y < srcSliceH; y++) {                                \
         uint8_t *image    = dst[0] + (y + srcSliceY) * dstStride[0]; \
         const uint8_t *py = src[0] +               y * srcStride[0]; \
-        const uint8_t *pu = src[1] +        (y >> 1) * srcStride[1]; \
-        const uint8_t *pv = src[2] +        (y >> 1) * srcStride[2]; \
+        const uint8_t *pu = src[1] +   (y >> vshift) * srcStride[1]; \
+        const uint8_t *pv = src[2] +   (y >> vshift) * srcStride[2]; \
         x86_reg index = -h_size / 2;                                 \
 
 #define YUV2RGB_INITIAL_LOAD          \
@@ -188,7 +185,7 @@ static inline int RENAME(yuv420_rgb15)(SwsContext *c, const uint8_t *src[],
                                        int srcSliceY, int srcSliceH,
                                        uint8_t *dst[], int dstStride[])
 {
-    int y, h_size;
+    int y, h_size, vshift;
 
     YUV2RGB_LOOP(2)
 
@@ -216,7 +213,7 @@ static inline int RENAME(yuv420_rgb16)(SwsContext *c, const uint8_t *src[],
                                        int srcSliceY, int srcSliceH,
                                        uint8_t *dst[], int dstStride[])
 {
-    int y, h_size;
+    int y, h_size, vshift;
 
     YUV2RGB_LOOP(2)
 
@@ -306,7 +303,7 @@ static inline int RENAME(yuv420_rgb24)(SwsContext *c, const uint8_t *src[],
                                        int srcSliceY, int srcSliceH,
                                        uint8_t *dst[], int dstStride[])
 {
-    int y, h_size;
+    int y, h_size, vshift;
 
     YUV2RGB_LOOP(3)
 
@@ -324,7 +321,7 @@ static inline int RENAME(yuv420_bgr24)(SwsContext *c, const uint8_t *src[],
                                        int srcSliceY, int srcSliceH,
                                        uint8_t *dst[], int dstStride[])
 {
-    int y, h_size;
+    int y, h_size, vshift;
 
     YUV2RGB_LOOP(3)
 
@@ -368,7 +365,7 @@ static inline int RENAME(yuv420_rgb32)(SwsContext *c, const uint8_t *src[],
                                        int srcSliceY, int srcSliceH,
                                        uint8_t *dst[], int dstStride[])
 {
-    int y, h_size;
+    int y, h_size, vshift;
 
     YUV2RGB_LOOP(4)
 
@@ -389,7 +386,7 @@ static inline int RENAME(yuva420_rgb32)(SwsContext *c, const uint8_t *src[],
                                         int srcSliceY, int srcSliceH,
                                         uint8_t *dst[], int dstStride[])
 {
-    int y, h_size;
+    int y, h_size, vshift;
 
     YUV2RGB_LOOP(4)
 
@@ -411,7 +408,7 @@ static inline int RENAME(yuv420_bgr32)(SwsContext *c, const uint8_t *src[],
                                        int srcSliceY, int srcSliceH,
                                        uint8_t *dst[], int dstStride[])
 {
-    int y, h_size;
+    int y, h_size, vshift;
 
     YUV2RGB_LOOP(4)
 
@@ -432,7 +429,7 @@ static inline int RENAME(yuva420_bgr32)(SwsContext *c, const uint8_t *src[],
                                         int srcSliceY, int srcSliceH,
                                         uint8_t *dst[], int dstStride[])
 {
-    int y, h_size;
+    int y, h_size, vshift;
 
     YUV2RGB_LOOP(4)