mirror of https://github.com/mpv-player/mpv
Slightly generalize code to generate YUV->RGB conversion table and add
XYZ->RGB conversion as an example for that. git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@30163 b3059339-0415-0410-9bf9-f77b7e298cf2
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@ -52,53 +52,67 @@ void mp_gen_gamma_map(uint8_t *map, int size, float gamma) {
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* \brief get the coefficients of the yuv -> rgb conversion matrix
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* \param params struct specifying the properties of the conversion like brightness, ...
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* \param yuv2rgb array to store coefficients into
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*
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* Note: contrast, hue and saturation will only work as expected with YUV formats,
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* not with e.g. MP_CSP_XYZ
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*/
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void mp_get_yuv2rgb_coeffs(struct mp_csp_params *params, float yuv2rgb[3][4]) {
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float uvcos = params->saturation * cos(params->hue);
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float uvsin = params->saturation * sin(params->hue);
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int format = params->format;
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int i;
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const float (*uv_coeffs)[2];
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static const float level_adjust[4] = {-16 / 255.0, -128 / 255.0, -128 / 255.0, 1.164};
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static const float uv_coeffs_table[MP_CSP_COUNT][3][2] = {
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const float (*uv_coeffs)[3];
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const float *level_adjust;
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static const float yuv_pc_level_adjust[4] = {-16 / 255.0, -128 / 255.0, -128 / 255.0, 1.164};
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static const float yuv_tv_level_adjust[4] = {0, -128 / 255.0, -128 / 255.0, 0};
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static const float xyz_level_adjust[4] = {0, 0, 0, 0};
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static const float uv_coeffs_table[MP_CSP_COUNT][3][3] = {
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[MP_CSP_DEFAULT] = {
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{ 0.000, 1.596},
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{-0.391, -0.813},
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{ 2.018, 0.000}
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{1, 0.000, 1.596},
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{1, -0.391, -0.813},
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{1, 2.018, 0.000}
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},
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[MP_CSP_BT_601] = {
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{ 0.000, 1.403},
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{-0.344, -0.714},
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{ 1.773, 0.000}
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{1, 0.000, 1.403},
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{1, -0.344, -0.714},
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{1, 1.773, 0.000}
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},
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[MP_CSP_BT_709] = {
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{ 0.0000, 1.5701},
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{-0.1870, -0.4664},
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{ 1.8556, 0.0000}
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{1, 0.0000, 1.5701},
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{1, -0.1870, -0.4664},
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{1, 1.8556, 0.0000}
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},
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[MP_CSP_SMPTE_240M] = {
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{ 0.0000, 1.5756},
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{-0.2253, -0.5000},
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{ 1.8270, 0.0000}
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{1, 0.0000, 1.5756},
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{1, -0.2253, -0.5000},
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{1, 1.8270, 0.0000}
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},
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[MP_CSP_EBU] = {
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{ 0.000, 1.140},
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{-0.396, -0.581},
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{ 2.029, 0.000}
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{1, 0.000, 1.140},
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{1, -0.396, -0.581},
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{1, 2.029, 0.000}
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},
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[MP_CSP_XYZ] = {
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{ 3.2404542, -1.5371385, -0.4985314},
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{-0.9692660, 1.8760108, 0.0415560},
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{ 0.0556434, -0.2040259, 1.0572252}
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},
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};
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if (format < 0 || format >= MP_CSP_COUNT)
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format = MP_CSP_DEFAULT;
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uv_coeffs = uv_coeffs_table[format];
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level_adjust = yuv_pc_level_adjust;
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if (format == MP_CSP_XYZ)
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level_adjust = xyz_level_adjust;
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for (i = 0; i < 3; i++) {
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yuv2rgb[i][COL_C] = params->brightness;
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yuv2rgb[i][COL_Y] = level_adjust[COL_C] * params->contrast;
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yuv2rgb[i][COL_Y] = uv_coeffs[i][COL_Y] * level_adjust[COL_C] * params->contrast;
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yuv2rgb[i][COL_C] += level_adjust[COL_Y] * yuv2rgb[i][COL_Y];
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yuv2rgb[i][COL_U] = uv_coeffs[i][0] * uvcos + uv_coeffs[i][1] * uvsin;
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yuv2rgb[i][COL_U] = uv_coeffs[i][COL_U] * uvcos + uv_coeffs[i][COL_V] * uvsin;
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yuv2rgb[i][COL_C] += level_adjust[COL_U] * yuv2rgb[i][COL_U];
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yuv2rgb[i][COL_V] = uv_coeffs[i][0] * uvsin + uv_coeffs[i][1] * uvcos;
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yuv2rgb[i][COL_V] = uv_coeffs[i][COL_U] * uvsin + uv_coeffs[i][COL_V] * uvcos;
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yuv2rgb[i][COL_C] += level_adjust[COL_V] * yuv2rgb[i][COL_V];
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// this "centers" contrast control so that e.g. a contrast of 0
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// leads to a grey image, not a black one
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@ -27,6 +27,7 @@ enum mp_csp_standard {
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MP_CSP_BT_709,
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MP_CSP_SMPTE_240M,
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MP_CSP_EBU,
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MP_CSP_XYZ,
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MP_CSP_COUNT
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};
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@ -1108,6 +1108,7 @@ static int preinit(const char *arg)
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" 2: YUV to RGB according to BT.709\n"
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" 3: YUV to RGB according to SMPT-240M\n"
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" 4: YUV to RGB according to EBU\n"
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" 5: XYZ to RGB\n"
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" lscale=<n>\n"
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" 0: use standard bilinear scaling for luma.\n"
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" 1: use improved bicubic scaling for luma.\n"
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