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| 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
| 4 | 4 |
| 5 // This webpage shows layout of YV12 and other YUV formats | 5 // This webpage shows layout of YV12 and other YUV formats |
| 6 // http://www.fourcc.org/yuv.php | 6 // http://www.fourcc.org/yuv.php |
| 7 // The actual conversion is best described here | 7 // The actual conversion is best described here |
| 8 // http://en.wikipedia.org/wiki/YUV | 8 // http://en.wikipedia.org/wiki/YUV |
| 9 // An article on optimizing YUV conversion using tables instead of multiplies | 9 // An article on optimizing YUV conversion using tables instead of multiplies |
| 10 // http://lestourtereaux.free.fr/papers/data/yuvrgb.pdf | 10 // http://lestourtereaux.free.fr/papers/data/yuvrgb.pdf |
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| 116 typedef void (*EmptyRegisterStateProc)(); | 116 typedef void (*EmptyRegisterStateProc)(); |
| 117 static EmptyRegisterStateProc g_empty_register_state_proc_ = NULL; | 117 static EmptyRegisterStateProc g_empty_register_state_proc_ = NULL; |
| 118 | 118 |
| 119 // Get the appropriate value to bitshift by for vertical indices. | 119 // Get the appropriate value to bitshift by for vertical indices. |
| 120 int GetVerticalShift(YUVType type) { | 120 int GetVerticalShift(YUVType type) { |
| 121 switch (type) { | 121 switch (type) { |
| 122 case YV16: | 122 case YV16: |
| 123 return 0; | 123 return 0; |
| 124 case YV12: | 124 case YV12: |
| 125 case YV12J: | 125 case YV12J: |
| 126 case YV12HD: |
| 126 return 1; | 127 return 1; |
| 127 } | 128 } |
| 128 NOTREACHED(); | 129 NOTREACHED(); |
| 129 return 0; | 130 return 0; |
| 130 } | 131 } |
| 131 | 132 |
| 132 const int16 (&GetLookupTable(YUVType type))[1024][4] { | 133 const int16 (&GetLookupTable(YUVType type))[1024][4] { |
| 133 switch (type) { | 134 switch (type) { |
| 134 case YV12: | 135 case YV12: |
| 135 case YV16: | 136 case YV16: |
| 136 return kCoefficientsRgbY; | 137 return kCoefficientsRgbY; |
| 137 case YV12J: | 138 case YV12J: |
| 138 return kCoefficientsRgbY_JPEG; | 139 return kCoefficientsRgbY_JPEG; |
| 140 case YV12HD: |
| 141 return kCoefficientsRgbY_Rec709; |
| 139 } | 142 } |
| 140 NOTREACHED(); | 143 NOTREACHED(); |
| 141 return kCoefficientsRgbY; | 144 return kCoefficientsRgbY; |
| 142 } | 145 } |
| 143 | 146 |
| 144 void InitializeCPUSpecificYUVConversions() { | 147 void InitializeCPUSpecificYUVConversions() { |
| 145 CHECK(!g_filter_yuv_rows_proc_); | 148 CHECK(!g_filter_yuv_rows_proc_); |
| 146 CHECK(!g_convert_yuv_to_rgb32_row_proc_); | 149 CHECK(!g_convert_yuv_to_rgb32_row_proc_); |
| 147 CHECK(!g_scale_yuv_to_rgb32_row_proc_); | 150 CHECK(!g_scale_yuv_to_rgb32_row_proc_); |
| 148 CHECK(!g_linear_scale_yuv_to_rgb32_row_proc_); | 151 CHECK(!g_linear_scale_yuv_to_rgb32_row_proc_); |
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| 682 width, | 685 width, |
| 683 height, | 686 height, |
| 684 ystride, | 687 ystride, |
| 685 uvstride, | 688 uvstride, |
| 686 astride, | 689 astride, |
| 687 rgbstride, | 690 rgbstride, |
| 688 yuv_type); | 691 yuv_type); |
| 689 } | 692 } |
| 690 | 693 |
| 691 } // namespace media | 694 } // namespace media |
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