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vf_colorspace: Add support for gbr color space 

Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>
This commit is contained in:
Vittorio Giovara 2017-06-05 16:05:11 -04:00
parent 18bca25adb
commit d9909b11d9
1 changed files with 12 additions and 0 deletions
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12
libavfilter/vf_colorspace.c
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@ -183,6 +183,13 @@ static const double ycgco_matrix[3][3] =
{ 0.5, 0, -0.5 },
};
static const double gbr_matrix[3][3] =
{
{ 0, 1, 0 },
{ 0, -0.5, 0.5 },
{ 0.5, -0.5, 0 },
};
/*
* All constants explained in e.g. https://linuxtv.org/downloads/v4l-dvb-apis/ch02s06.html
* The older ones (bt470bg/m) are also explained in their respective ITU docs
@ -196,6 +203,7 @@ static const struct LumaCoefficients luma_coefficients[AVCOL_SPC_NB] = {
[AVCOL_SPC_BT709] = { 0.2126, 0.7152, 0.0722 },
[AVCOL_SPC_SMPTE240M] = { 0.212, 0.701, 0.087 },
[AVCOL_SPC_YCOCG] = { 0.25, 0.5, 0.25 },
[AVCOL_SPC_RGB] = { 1, 1, 1 },
[AVCOL_SPC_BT2020_NCL] = { 0.2627, 0.6780, 0.0593 },
[AVCOL_SPC_BT2020_CL] = { 0.2627, 0.6780, 0.0593 },
};
@ -222,6 +230,9 @@ static void fill_rgb2yuv_table(const struct LumaCoefficients *coeffs,
if (coeffs->cr == 0.25 && coeffs->cg == 0.5 && coeffs->cb == 0.25) {
memcpy(rgb2yuv, ycgco_matrix, sizeof(double) * 9);
return;
} else if (coeffs->cr == 1 && coeffs->cg == 1 && coeffs->cb == 1) {
memcpy(rgb2yuv, gbr_matrix, sizeof(double) * 9);
return;
}
rgb2yuv[0][0] = coeffs->cr;
@ -1074,6 +1085,7 @@ static const AVOption colorspace_options[] = {
ENUM("smpte170m", AVCOL_SPC_SMPTE170M, "csp"),
ENUM("smpte240m", AVCOL_SPC_SMPTE240M, "csp"),
ENUM("ycgco", AVCOL_SPC_YCGCO, "csp"),
ENUM("gbr", AVCOL_SPC_RGB, "csp"),
ENUM("bt2020ncl", AVCOL_SPC_BT2020_NCL, "csp"),
{ "range", "Output color range",