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Bug 1304330 - Update YuvConstants of BT.709 YUV r=jesup

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This commit is contained in:
Sotaro Ikeda 2016-09-28 19:50:14 -07:00
parent 21163fba88
commit 2cc1d95c31
1 changed files with 10 additions and 10 deletions
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20
media/libyuv/source/row_common.cc
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@ -1143,20 +1143,20 @@ const YuvConstants SIMD_ALIGNED(kYvuJPEGConstants) = {
#undef YG
// BT.709 YUV to RGB reference
// * R = Y - V * -1.28033
// * G = Y - U * 0.21482 - V * 0.38059
// * B = Y - U * -2.12798
// R = (Y - 16) * 1.164 - V * -1.793
// G = (Y - 16) * 1.164 - U * 0.213 - V * 0.533
// B = (Y - 16) * 1.164 - U * -2.112
// Y contribution to R,G,B. Scale and bias.
#define YG 16320 /* round(1.000 * 64 * 256 * 256 / 257) */
#define YGB 32 /* 64 / 2 */
#define YG 18997 /* round(1.164 * 64 * 256 * 256 / 257) */
#define YGB -1160 /* 1.164 * 64 * -16 + 64 / 2 */
// TODO(fbarchard): Find way to express 2.12 instead of 2.0.
// TODO(fbarchard): Find way to express 2.112 instead of 2.0.
// U and V contributions to R,G,B.
#define UB -128 /* max(-128, round(-2.12798 * 64)) */
#define UG 14 /* round(0.21482 * 64) */
#define VG 24 /* round(0.38059 * 64) */
#define VR -82 /* round(-1.28033 * 64) */
#define UB -128 /* max(-128, round(-2.112 * 64)) */
#define UG 14 /* round(0.213 * 64) */
#define VG 34 /* round(0.533 * 64) */
#define VR -115 /* round(-1.793 * 64) */
// Bias values to round, and subtract 128 from U and V.
#define BB (UB * 128 + YGB)