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// 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_row.h"
#if !USE_SSE2
namespace media {
static int clip_byte(int x) {
if (x > 255)
return 255;
else if (x < 0)
return 0;
else
return x;
}
void ConvertRGB32ToYUV(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 RGB32, there are 4 bytes per pixel.
const uint8* pixel = rgbframe + 4 * 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;
}
}
}
} // namespace media
#endif
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