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Slightly generalize code to generate YUV->RGB conversion table and add

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XYZ->RGB conversion as an example for that.


git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@30163 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
reimar 2010-01-01 12:54:09 +00:00
parent 85344073fa
commit 5f684e1b32
3 changed files with 37 additions and 21 deletions
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56
libvo/csputils.c
View File

@ -52,53 +52,67 @@ void mp_gen_gamma_map(uint8_t *map, int size, float gamma) {
* \brief get the coefficients of the yuv -> rgb conversion matrix
* \param params struct specifying the properties of the conversion like brightness, ...
* \param yuv2rgb array to store coefficients into
*
* Note: contrast, hue and saturation will only work as expected with YUV formats,
* not with e.g. MP_CSP_XYZ
*/
void mp_get_yuv2rgb_coeffs(struct mp_csp_params *params, float yuv2rgb[3][4]) {
float uvcos = params->saturation * cos(params->hue);
float uvsin = params->saturation * sin(params->hue);
int format = params->format;
int i;
const float (*uv_coeffs)[2];
static const float level_adjust[4] = {-16 / 255.0, -128 / 255.0, -128 / 255.0, 1.164};
static const float uv_coeffs_table[MP_CSP_COUNT][3][2] = {
const float (*uv_coeffs)[3];
const float *level_adjust;
static const float yuv_pc_level_adjust[4] = {-16 / 255.0, -128 / 255.0, -128 / 255.0, 1.164};
static const float yuv_tv_level_adjust[4] = {0, -128 / 255.0, -128 / 255.0, 0};
static const float xyz_level_adjust[4] = {0, 0, 0, 0};
static const float uv_coeffs_table[MP_CSP_COUNT][3][3] = {
[MP_CSP_DEFAULT] = {
{ 0.000, 1.596},
{-0.391, -0.813},
{ 2.018, 0.000}
{1, 0.000, 1.596},
{1, -0.391, -0.813},
{1, 2.018, 0.000}
},
[MP_CSP_BT_601] = {
{ 0.000, 1.403},
{-0.344, -0.714},
{ 1.773, 0.000}
{1, 0.000, 1.403},
{1, -0.344, -0.714},
{1, 1.773, 0.000}
},
[MP_CSP_BT_709] = {
{ 0.0000, 1.5701},
{-0.1870, -0.4664},
{ 1.8556, 0.0000}
{1, 0.0000, 1.5701},
{1, -0.1870, -0.4664},
{1, 1.8556, 0.0000}
},
[MP_CSP_SMPTE_240M] = {
{ 0.0000, 1.5756},
{-0.2253, -0.5000},
{ 1.8270, 0.0000}
{1, 0.0000, 1.5756},
{1, -0.2253, -0.5000},
{1, 1.8270, 0.0000}
},
[MP_CSP_EBU] = {
{ 0.000, 1.140},
{-0.396, -0.581},
{ 2.029, 0.000}
{1, 0.000, 1.140},
{1, -0.396, -0.581},
{1, 2.029, 0.000}
},
[MP_CSP_XYZ] = {
{ 3.2404542, -1.5371385, -0.4985314},
{-0.9692660, 1.8760108, 0.0415560},
{ 0.0556434, -0.2040259, 1.0572252}
},
};
if (format < 0 || format >= MP_CSP_COUNT)
format = MP_CSP_DEFAULT;
uv_coeffs = uv_coeffs_table[format];
level_adjust = yuv_pc_level_adjust;
if (format == MP_CSP_XYZ)
level_adjust = xyz_level_adjust;
for (i = 0; i < 3; i++) {
yuv2rgb[i][COL_C] = params->brightness;
yuv2rgb[i][COL_Y] = level_adjust[COL_C] * params->contrast;
yuv2rgb[i][COL_Y] = uv_coeffs[i][COL_Y] * level_adjust[COL_C] * params->contrast;
yuv2rgb[i][COL_C] += level_adjust[COL_Y] * yuv2rgb[i][COL_Y];
yuv2rgb[i][COL_U] = uv_coeffs[i][0] * uvcos + uv_coeffs[i][1] * uvsin;
yuv2rgb[i][COL_U] = uv_coeffs[i][COL_U] * uvcos + uv_coeffs[i][COL_V] * uvsin;
yuv2rgb[i][COL_C] += level_adjust[COL_U] * yuv2rgb[i][COL_U];
yuv2rgb[i][COL_V] = uv_coeffs[i][0] * uvsin + uv_coeffs[i][1] * uvcos;
yuv2rgb[i][COL_V] = uv_coeffs[i][COL_U] * uvsin + uv_coeffs[i][COL_V] * uvcos;
yuv2rgb[i][COL_C] += level_adjust[COL_V] * yuv2rgb[i][COL_V];
// this "centers" contrast control so that e.g. a contrast of 0
// leads to a grey image, not a black one

1
libvo/csputils.h
View File

@ -27,6 +27,7 @@ enum mp_csp_standard {
MP_CSP_BT_709,
MP_CSP_SMPTE_240M,
MP_CSP_EBU,
MP_CSP_XYZ,
MP_CSP_COUNT
};

1
libvo/vo_gl.c
View File

@ -1108,6 +1108,7 @@ static int preinit(const char *arg)
" 2: YUV to RGB according to BT.709\n"
" 3: YUV to RGB according to SMPT-240M\n"
" 4: YUV to RGB according to EBU\n"
" 5: XYZ to RGB\n"
" lscale=<n>\n"
" 0: use standard bilinear scaling for luma.\n"
" 1: use improved bicubic scaling for luma.\n"