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299 lines
8.4 KiB
C
299 lines
8.4 KiB
C
/*
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Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely.
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*/
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#include "SDL.h"
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#include "testyuv_cvt.h"
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static float clip3(float x, float y, float z)
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{
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return (z < x) ? x : ((z > y) ? y : z);
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}
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static void RGBtoYUV(const Uint8 *rgb, int *yuv, SDL_YUV_CONVERSION_MODE mode, int monochrome, int luminance)
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{
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if (mode == SDL_YUV_CONVERSION_JPEG) {
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/* Full range YUV */
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yuv[0] = (int)(0.299 * rgb[0] + 0.587 * rgb[1] + 0.114 * rgb[2]);
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yuv[1] = (int)((rgb[2] - yuv[0]) * 0.565 + 128);
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yuv[2] = (int)((rgb[0] - yuv[0]) * 0.713 + 128);
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} else {
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// This formula is from Microsoft's documentation:
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// https://msdn.microsoft.com/en-us/library/windows/desktop/dd206750(v=vs.85).aspx
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// L = Kr * R + Kb * B + (1 - Kr - Kb) * G
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// Y = SDL_floor(2^(M-8) * (219*(L-Z)/S + 16) + 0.5);
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// U = clip3(0, (2^M)-1, SDL_floor(2^(M-8) * (112*(B-L) / ((1-Kb)*S) + 128) + 0.5));
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// V = clip3(0, (2^M)-1, SDL_floor(2^(M-8) * (112*(R-L) / ((1-Kr)*S) + 128) + 0.5));
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float S, Z, R, G, B, L, Kr, Kb, Y, U, V;
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if (mode == SDL_YUV_CONVERSION_BT709) {
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/* BT.709 */
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Kr = 0.2126f;
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Kb = 0.0722f;
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} else {
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/* BT.601 */
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Kr = 0.299f;
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Kb = 0.114f;
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}
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S = 255.0f;
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Z = 0.0f;
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R = rgb[0];
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G = rgb[1];
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B = rgb[2];
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L = Kr * R + Kb * B + (1 - Kr - Kb) * G;
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Y = (Uint8)SDL_floorf((219 * (L - Z) / S + 16) + 0.5f);
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U = (Uint8)clip3(0, 255, SDL_floorf((112.0f * (B - L) / ((1.0f - Kb) * S) + 128) + 0.5f));
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V = (Uint8)clip3(0, 255, SDL_floorf((112.0f * (R - L) / ((1.0f - Kr) * S) + 128) + 0.5f));
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yuv[0] = (Uint8)Y;
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yuv[1] = (Uint8)U;
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yuv[2] = (Uint8)V;
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}
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if (monochrome) {
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yuv[1] = 128;
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yuv[2] = 128;
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}
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if (luminance != 100) {
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yuv[0] = yuv[0] * luminance / 100;
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if (yuv[0] > 255) {
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yuv[0] = 255;
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}
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}
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}
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static void ConvertRGBtoPlanar2x2(Uint32 format, Uint8 *src, int pitch, Uint8 *out, int w, int h, SDL_YUV_CONVERSION_MODE mode, int monochrome, int luminance)
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{
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int x, y;
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int yuv[4][3];
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Uint8 *Y1, *Y2, *U, *V;
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Uint8 *rgb1, *rgb2;
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int rgb_row_advance = (pitch - w * 3) + pitch;
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int UV_advance;
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rgb1 = src;
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rgb2 = src + pitch;
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Y1 = out;
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Y2 = Y1 + w;
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switch (format) {
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case SDL_PIXELFORMAT_YV12:
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V = (Y1 + h * w);
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U = V + ((h + 1) / 2) * ((w + 1) / 2);
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UV_advance = 1;
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break;
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case SDL_PIXELFORMAT_IYUV:
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U = (Y1 + h * w);
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V = U + ((h + 1) / 2) * ((w + 1) / 2);
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UV_advance = 1;
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break;
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case SDL_PIXELFORMAT_NV12:
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U = (Y1 + h * w);
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V = U + 1;
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UV_advance = 2;
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break;
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case SDL_PIXELFORMAT_NV21:
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V = (Y1 + h * w);
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U = V + 1;
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UV_advance = 2;
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break;
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default:
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SDL_assert(!"Unsupported planar YUV format");
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return;
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}
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for (y = 0; y < (h - 1); y += 2) {
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for (x = 0; x < (w - 1); x += 2) {
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RGBtoYUV(rgb1, yuv[0], mode, monochrome, luminance);
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rgb1 += 3;
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*Y1++ = (Uint8)yuv[0][0];
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RGBtoYUV(rgb1, yuv[1], mode, monochrome, luminance);
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rgb1 += 3;
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*Y1++ = (Uint8)yuv[1][0];
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RGBtoYUV(rgb2, yuv[2], mode, monochrome, luminance);
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rgb2 += 3;
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*Y2++ = (Uint8)yuv[2][0];
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RGBtoYUV(rgb2, yuv[3], mode, monochrome, luminance);
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rgb2 += 3;
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*Y2++ = (Uint8)yuv[3][0];
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*U = (Uint8)SDL_floorf((yuv[0][1] + yuv[1][1] + yuv[2][1] + yuv[3][1]) / 4.0f + 0.5f);
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U += UV_advance;
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*V = (Uint8)SDL_floorf((yuv[0][2] + yuv[1][2] + yuv[2][2] + yuv[3][2]) / 4.0f + 0.5f);
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V += UV_advance;
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}
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/* Last column */
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if (x == (w - 1)) {
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RGBtoYUV(rgb1, yuv[0], mode, monochrome, luminance);
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rgb1 += 3;
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*Y1++ = (Uint8)yuv[0][0];
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RGBtoYUV(rgb2, yuv[2], mode, monochrome, luminance);
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rgb2 += 3;
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*Y2++ = (Uint8)yuv[2][0];
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*U = (Uint8)SDL_floorf((yuv[0][1] + yuv[2][1]) / 2.0f + 0.5f);
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U += UV_advance;
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*V = (Uint8)SDL_floorf((yuv[0][2] + yuv[2][2]) / 2.0f + 0.5f);
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V += UV_advance;
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}
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Y1 += w;
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Y2 += w;
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rgb1 += rgb_row_advance;
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rgb2 += rgb_row_advance;
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}
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/* Last row */
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if (y == (h - 1)) {
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for (x = 0; x < (w - 1); x += 2) {
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RGBtoYUV(rgb1, yuv[0], mode, monochrome, luminance);
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rgb1 += 3;
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*Y1++ = (Uint8)yuv[0][0];
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RGBtoYUV(rgb1, yuv[1], mode, monochrome, luminance);
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rgb1 += 3;
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*Y1++ = (Uint8)yuv[1][0];
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*U = (Uint8)SDL_floorf((yuv[0][1] + yuv[1][1]) / 2.0f + 0.5f);
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U += UV_advance;
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*V = (Uint8)SDL_floorf((yuv[0][2] + yuv[1][2]) / 2.0f + 0.5f);
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V += UV_advance;
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}
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/* Last column */
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if (x == (w - 1)) {
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RGBtoYUV(rgb1, yuv[0], mode, monochrome, luminance);
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*Y1++ = (Uint8)yuv[0][0];
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*U = (Uint8)yuv[0][1];
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U += UV_advance;
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*V = (Uint8)yuv[0][2];
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V += UV_advance;
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}
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}
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}
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static void ConvertRGBtoPacked4(Uint32 format, Uint8 *src, int pitch, Uint8 *out, int w, int h, SDL_YUV_CONVERSION_MODE mode, int monochrome, int luminance)
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{
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int x, y;
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int yuv[2][3];
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Uint8 *Y1, *Y2, *U, *V;
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Uint8 *rgb;
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int rgb_row_advance = (pitch - w * 3);
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rgb = src;
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switch (format) {
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case SDL_PIXELFORMAT_YUY2:
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Y1 = out;
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U = out + 1;
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Y2 = out + 2;
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V = out + 3;
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break;
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case SDL_PIXELFORMAT_UYVY:
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U = out;
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Y1 = out + 1;
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V = out + 2;
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Y2 = out + 3;
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break;
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case SDL_PIXELFORMAT_YVYU:
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Y1 = out;
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V = out + 1;
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Y2 = out + 2;
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U = out + 3;
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break;
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default:
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SDL_assert(!"Unsupported packed YUV format");
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return;
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}
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for (y = 0; y < h; ++y) {
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for (x = 0; x < (w - 1); x += 2) {
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RGBtoYUV(rgb, yuv[0], mode, monochrome, luminance);
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rgb += 3;
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*Y1 = (Uint8)yuv[0][0];
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Y1 += 4;
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RGBtoYUV(rgb, yuv[1], mode, monochrome, luminance);
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rgb += 3;
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*Y2 = (Uint8)yuv[1][0];
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Y2 += 4;
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*U = (Uint8)SDL_floorf((yuv[0][1] + yuv[1][1]) / 2.0f + 0.5f);
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U += 4;
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*V = (Uint8)SDL_floorf((yuv[0][2] + yuv[1][2]) / 2.0f + 0.5f);
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V += 4;
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}
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/* Last column */
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if (x == (w - 1)) {
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RGBtoYUV(rgb, yuv[0], mode, monochrome, luminance);
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rgb += 3;
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*Y2 = *Y1 = (Uint8)yuv[0][0];
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Y1 += 4;
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Y2 += 4;
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*U = (Uint8)yuv[0][1];
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U += 4;
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*V = (Uint8)yuv[0][2];
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V += 4;
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}
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rgb += rgb_row_advance;
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}
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}
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SDL_bool ConvertRGBtoYUV(Uint32 format, Uint8 *src, int pitch, Uint8 *out, int w, int h, SDL_YUV_CONVERSION_MODE mode, int monochrome, int luminance)
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{
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switch (format) {
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case SDL_PIXELFORMAT_YV12:
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case SDL_PIXELFORMAT_IYUV:
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case SDL_PIXELFORMAT_NV12:
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case SDL_PIXELFORMAT_NV21:
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ConvertRGBtoPlanar2x2(format, src, pitch, out, w, h, mode, monochrome, luminance);
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return SDL_TRUE;
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case SDL_PIXELFORMAT_YUY2:
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case SDL_PIXELFORMAT_UYVY:
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case SDL_PIXELFORMAT_YVYU:
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ConvertRGBtoPacked4(format, src, pitch, out, w, h, mode, monochrome, luminance);
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return SDL_TRUE;
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default:
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return SDL_FALSE;
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}
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}
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int CalculateYUVPitch(Uint32 format, int width)
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{
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switch (format) {
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case SDL_PIXELFORMAT_YV12:
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case SDL_PIXELFORMAT_IYUV:
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case SDL_PIXELFORMAT_NV12:
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case SDL_PIXELFORMAT_NV21:
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return width;
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case SDL_PIXELFORMAT_YUY2:
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case SDL_PIXELFORMAT_UYVY:
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case SDL_PIXELFORMAT_YVYU:
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return 4 * ((width + 1) / 2);
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default:
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return 0;
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}
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}
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/* vi: set ts=4 sw=4 expandtab: */
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