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Diffstat (limited to 'files/util/yuvconstants.c')
| -rw-r--r-- | files/util/yuvconstants.c | 106 |
1 files changed, 0 insertions, 106 deletions
diff --git a/files/util/yuvconstants.c b/files/util/yuvconstants.c deleted file mode 100644 index 4e5185af..00000000 --- a/files/util/yuvconstants.c +++ /dev/null @@ -1,106 +0,0 @@ -/* - * Copyright 2021 The LibYuv Project Authors. All rights reserved. - * - * Use of this source code is governed by a BSD-style license - * that can be found in the LICENSE file in the root of the source - * tree. An additional intellectual property rights grant can be found - * in the file PATENTS. All contributing project authors may - * be found in the AUTHORS file in the root of the source tree. - */ - -#include <math.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.h> - -// This utility computes values needed to generate yuvconstants based on -// white point values. -// The yuv formulas are tuned for 8 bit YUV channels. - -// See Also -// https://mymusing.co/bt601-yuv-to-rgb-conversion-color/ - -// BT.709 full range YUV to RGB reference -// R = Y + V * 1.5748 -// G = Y - U * 0.18732 - V * 0.46812 -// B = Y + U * 1.8556 -// KR = 0.2126 -// KB = 0.0722 - -// // Y contribution to R,G,B. Scale and bias. -// #define YG 16320 /* round(1.000 * 64 * 256 * 256 / 257) */ -// #define YB 32 /* 64 / 2 */ -// -// // U and V contributions to R,G,B. -// #define UB 113 /* round(1.77200 * 64) */ -// #define UG 22 /* round(0.34414 * 64) */ -// #define VG 46 /* round(0.71414 * 64) */ -// #define VR 90 /* round(1.40200 * 64) */ -// -// // Bias values to round, and subtract 128 from U and V. -// #define BB (-UB * 128 + YB) -// #define BG (UG * 128 + VG * 128 + YB) -// #define BR (-VR * 128 + YB) - -int main(int argc, const char* argv[]) { - if (argc < 3) { - printf("yuvconstants [KR] [KB]\n"); - printf(" e.g. yuvconstants 0.2126 0.0722\n"); - printf(" MC BT KR KB\n"); - printf(" 1 BT.709 KR = 0.2126; KB = 0.0722\n"); - printf(" 4 FCC KR = 0.30; KB = 0.11\n"); - printf(" 6 BT.601 KR = 0.299; KB = 0.114\n"); - printf(" 7 SMPTE 240M KR = 0.212; KB = 0.087\n"); - printf(" 9 BT.2020 KR = 0.2627; KB = 0.0593\n"); - return -1; - } - float kr = (float)atof(argv[1]); - float kb = (float)atof(argv[2]); - float kg = 1 - kr - kb; - - float vr = 2 * (1 - kr); - float ug = 2 * ((1 - kb) * kb / kg); - float vg = 2 * ((1 - kr) * kr / kg); - float ub = 2 * (1 - kb); - - printf("Full range\n"); - printf("R = Y + V * %5f\n", vr); - printf("G = Y - U * %6f - V * %6f\n", ug, vg); - printf("B = Y + U * %5f\n", ub); - - printf("KR = %4f; ", kr); - printf("KB = %4f\n", kb); - // printf("KG = %4f\n", kg); - // #define YG 16320 /* round(1.000 * 64 * 256 * 256 / 257) */ - // #define YB 32 /* 64 / 2 */ - // - // // U and V contributions to R,G,B. - - printf("UB %-3.0f /* round(%f * 64 = %8.4f) */\n", round(ub * 64), ub, ub * 64); - printf("UG %-3.0f /* round(%f * 64 = %8.4f) */\n", round(ug * 64), ug, ug * 64); - printf("VG %-3.0f /* round(%f * 64 = %8.4f) */\n", round(vg * 64), vg, vg * 64); - printf("VR %-3.0f /* round(%f * 64 = %8.4f) */\n", round(vr * 64), vr, vr * 64); - - vr = 255.f / 224.f * 2 * (1 - kr); - ug = 255.f / 224.f * 2 * ((1 - kb) * kb / kg); - vg = 255.f / 224.f * 2 * ((1 - kr) * kr / kg); - ub = 255.f / 224.f * 2 * (1 - kb); - - printf("\nLimited range\n"); - printf("R = (Y - 16) * 1.164 + V * %5f\n", vr); - printf("G = (Y - 16) * 1.164 - U * %6f - V * %6f\n", ug, vg); - printf("B = (Y - 16) * 1.164 + U * %5f\n", ub); - - // printf("KG = %4f\n", kg); - // #define YG 16320 /* round(1.000 * 64 * 256 * 256 / 257) */ - // #define YB 32 /* 64 / 2 */ - // - // // U and V contributions to R,G,B. - - printf("UB %-3.0f /* round(%f * 64 = %8.4f) */\n", round(ub * 64), ub, ub * 64); - printf("UG %-3.0f /* round(%f * 64 = %8.4f) */\n", round(ug * 64), ug, ug * 64); - printf("VG %-3.0f /* round(%f * 64 = %8.4f) */\n", round(vg * 64), vg, vg * 64); - printf("VR %-3.0f /* round(%f * 64 = %8.4f) */\n", round(vr * 64), vr, vr * 64); - - return 0; -} |