1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #include "media/base/simd/convert_rgb_to_yuv.h" 6 7 namespace media { 8 9 static int clip_byte(int x) { 10 if (x > 255) 11 return 255; 12 else if (x < 0) 13 return 0; 14 else 15 return x; 16 } 17 18 void ConvertRGB32ToYUV_C(const uint8* rgbframe, 19 uint8* yplane, 20 uint8* uplane, 21 uint8* vplane, 22 int width, 23 int height, 24 int rgbstride, 25 int ystride, 26 int uvstride) { 27 #if defined(OS_ANDROID) 28 const int r = 0; 29 const int g = 1; 30 const int b = 2; 31 #else 32 const int r = 2; 33 const int g = 1; 34 const int b = 0; 35 #endif 36 37 for (int i = 0; i < height; ++i) { 38 for (int j = 0; j < width; ++j) { 39 // Since the input pixel format is RGB32, there are 4 bytes per pixel. 40 const uint8* pixel = rgbframe + 4 * j; 41 yplane[j] = clip_byte(((pixel[r] * 66 + pixel[g] * 129 + 42 pixel[b] * 25 + 128) >> 8) + 16); 43 if (i % 2 == 0 && j % 2 == 0) { 44 uplane[j / 2] = clip_byte(((pixel[r] * -38 + pixel[g] * -74 + 45 pixel[b] * 112 + 128) >> 8) + 128); 46 vplane[j / 2] = clip_byte(((pixel[r] * 112 + pixel[g] * -94 + 47 pixel[b] * -18 + 128) >> 8) + 128); 48 } 49 } 50 rgbframe += rgbstride; 51 yplane += ystride; 52 if (i % 2 == 0) { 53 uplane += uvstride; 54 vplane += uvstride; 55 } 56 } 57 } 58 59 void ConvertRGB24ToYUV_C(const uint8* rgbframe, 60 uint8* yplane, 61 uint8* uplane, 62 uint8* vplane, 63 int width, 64 int height, 65 int rgbstride, 66 int ystride, 67 int uvstride) { 68 for (int i = 0; i < height; ++i) { 69 for (int j = 0; j < width; ++j) { 70 // Since the input pixel format is RGB24, there are 3 bytes per pixel. 71 const uint8* pixel = rgbframe + 3 * j; 72 yplane[j] = clip_byte(((pixel[2] * 66 + pixel[1] * 129 + 73 pixel[0] * 25 + 128) >> 8) + 16); 74 if (i % 2 == 0 && j % 2 == 0) { 75 uplane[j / 2] = clip_byte(((pixel[2] * -38 + pixel[1] * -74 + 76 pixel[0] * 112 + 128) >> 8) + 128); 77 vplane[j / 2] = clip_byte(((pixel[2] * 112 + pixel[1] * -94 + 78 pixel[0] * -18 + 128) >> 8) + 128); 79 } 80 } 81 82 rgbframe += rgbstride; 83 yplane += ystride; 84 if (i % 2 == 0) { 85 uplane += uvstride; 86 vplane += uvstride; 87 } 88 } 89 } 90 91 } // namespace media 92
