VideoCaptureHost

media/base/yuv_convert_c.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "media/base/yuv_convert.h"
 #include "media/base/yuv_convert_internal.h"
 
 namespace media {
 
 static int clip_byte(int x) {
@@ skipping 30 matching lines @@
 
     rgbframe += rgbstride;
     yplane += ystride;
     if (i % 2 == 0) {
       uplane += uvstride;
       vplane += uvstride;
     }
   }
 }
 
+void ConvertRGB24ToYUV_C(const uint8* rgbframe,
+                         uint8* yplane,
+                         uint8* uplane,
+                         uint8* vplane,
+                         int width,
+                         int height,
+                         int rgbstride,
+                         int ystride,
+                         int uvstride) {
+  for (int i = 0; i < height; ++i) {
+    for (int j = 0; j < width; ++j) {
+      // Since the input pixel format is RGB24, there are 3 bytes per pixel.
+      const uint8* pixel = rgbframe + 3 * j;
+      yplane[j] = clip_byte(((pixel[2] * 66 + pixel[1] * 129 +
+                              pixel[0] * 25 + 128) >> 8) + 16);
+      if (i % 2 == 0 && j % 2 == 0) {
+        uplane[j / 2] = clip_byte(((pixel[2] * -38 + pixel[1] * -74 +
+                                    pixel[0] * 112 + 128) >> 8) + 128);
+        vplane[j / 2] = clip_byte(((pixel[2] * 112 + pixel[1] * -94 +
+                                    pixel[1] * -18 + 128) >> 8) + 128);
+      }
+    }
+
+    rgbframe += rgbstride;
+    yplane += ystride;
+    if (i % 2 == 0) {
+      uplane += uvstride;
+      vplane += uvstride;
+    }
+  }
+}
+
+void ConvertYUY2ToYUV_C(const uint8* src,
+                        uint8* yplane,
+                        uint8* uplane,
+                        uint8* vplane,
+                        int width,
+                        int height) {
+  for (int i = 0; i < height / 2; ++i) {
+    for (int j = 0; j < (width / 2); ++j) {
+      yplane[0] = src[0];
+      *uplane = src[1];
+      yplane[1] = src[2];
+      *vplane = src[3];
+      src += 4;
+      yplane += 2;
+      uplane++;
+      vplane++;
+    }
+    for (int j = 0; j < (width / 2); ++j) {
+      yplane[0] = src[0];
+      yplane[1] = src[2];
+      src += 4;
+      yplane += 2;
+    }
+  }
+}
+
 }  // namespace media