Implements RGB to YV12 conversion in YASM.

media/base/yuv_convert.cc

Index: media/base/yuv_convert.cc
===================================================================
--- media/base/yuv_convert.cc	(revision 99073)
+++ media/base/yuv_convert.cc	(working copy)
@@ -19,6 +19,8 @@
 
 #include "build/build_config.h"
 #include "media/base/cpu_features.h"
+#include "media/base/simd/convert_rgb_to_yuv.h"
+#include "media/base/simd/convert_yuv_to_rgb.h"
 #include "media/base/yuv_convert_internal.h"
 #include "media/base/yuv_row.h"
 
@@ -52,6 +54,12 @@
                        int uv_pitch,
                        int rgb_pitch,
                        YUVType yuv_type) {
+  if (hasSSSE3()) {
+    simd::ConvertYUVtoRGB32(y_buf, u_buf, v_buf, rgb_buf, width, height,
+                            y_pitch, uv_pitch, rgb_pitch, yuv_type);
+    return;
+  }
+

[Alpha Left Google, 2011/09/01 13:24:45]

Add a comment here that we use the MMX version as a fallback.

   unsigned int y_shift = yuv_type;
   for (int y = 0; y < height; ++y) {
     uint8* rgb_row = rgb_buf + y * rgb_pitch;
@@ -366,8 +374,10 @@
     // TODO(hclam): Implement a NEON version.
     convert_proc = &ConvertRGB32ToYUV_C;
 #else
-    // For x86 processors, check if SSE2 is supported.
-    if (hasSSE2())
+    // For x86 processors, check if SSSE3 (or SSE2) is supported.
+    if (hasSSSE3())
+      convert_proc = &simd::ConvertRGB32toYUV;
+    else if (hasSSE2())
       convert_proc = &ConvertRGB32ToYUV_SSE2;
     else
       convert_proc = &ConvertRGB32ToYUV_C;
@@ -387,8 +397,21 @@
                        int rgbstride,
                        int ystride,
                        int uvstride) {
+#if defined(ARCH_CPU_ARM_FAMILY)
   ConvertRGB24ToYUV_C(rgbframe, yplane, uplane, vplane, width, height,
                       rgbstride, ystride, uvstride);
+#else
+  static void (*convert_proc)(const uint8*, uint8*, uint8*, uint8*,
+                              int, int, int, int, int) = NULL;
+  if (!convert_proc) {
+    if (hasSSSE3())
+      convert_proc = &simd::ConvertRGB24toYUV;
+    else
+      convert_proc = & ConvertRGB24ToYUV_C;
+  }
+  convert_proc(rgbframe, yplane, uplane, vplane, width, height,
+               rgbstride, ystride, uvstride);
+#endif
 }
 
 void ConvertYUY2ToYUV(const uint8* src,