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avfilter/vf_colormatrix: increase precision

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Signed-off-by: Thomas Mundt <loudmax@yahoo.de>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Thomas Mundt 2016-03-26 11:53:36 +01:00 committed by Michael Niedermayer
parent 13aae86a2b
commit 2e395bbccf
3 changed files with 24 additions and 18 deletions
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38
libavfilter/vf_colormatrix.c
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@ -40,19 +40,11 @@
#define NS(n) ((n) < 0 ? (int)((n)*65536.0-0.5+DBL_EPSILON) : (int)((n)*65536.0+0.5))
#define CB(n) av_clip_uint8(n)
static const double yuv_coeff[4][3][3] = {
{ { +0.7152, +0.0722, +0.2126 }, // Rec.709 (0)
{ -0.3850, +0.5000, -0.1150 },
{ -0.4540, -0.0460, +0.5000 } },
{ { +0.5900, +0.1100, +0.3000 }, // FCC (1)
{ -0.3310, +0.5000, -0.1690 },
{ -0.4210, -0.0790, +0.5000 } },
{ { +0.5870, +0.1140, +0.2990 }, // Rec.601 (ITU-R BT.470-2/SMPTE 170M) (2)
{ -0.3313, +0.5000, -0.1687 },
{ -0.4187, -0.0813, +0.5000 } },
{ { +0.7010, +0.0870, +0.2120 }, // SMPTE 240M (3)
{ -0.3840, +0.5000, -0.1160 },
{ -0.4450, -0.0550, +0.5000 } },
static const double yuv_coeff_luma[4][3] = {
{ +0.7152, +0.0722, +0.2126 }, // Rec.709 (0)
{ +0.5900, +0.1100, +0.3000 }, // FCC (1)
{ +0.5870, +0.1140, +0.2990 }, // Rec.601 (ITU-R BT.470-2/SMPTE 170M) (2)
{ +0.7010, +0.0870, +0.2120 }, // SMPTE 240M (3)
};
enum ColorMode {
@ -122,7 +114,7 @@ AVFILTER_DEFINE_CLASS(colormatrix);
#define imh im[2][1]
#define imi im[2][2]
static void inverse3x3(double im[3][3], const double m[3][3])
static void inverse3x3(double im[3][3], double m[3][3])
{
double det = ma * (me * mi - mf * mh) - mb * (md * mi - mf * mg) + mc * (md * mh - me * mg);
det = 1.0 / det;
@ -137,7 +129,7 @@ static void inverse3x3(double im[3][3], const double m[3][3])
imi = det * (ma * me - mb * md);
}
static void solve_coefficients(double cm[3][3], double rgb[3][3], const double yuv[3][3])
static void solve_coefficients(double cm[3][3], double rgb[3][3], double yuv[3][3])
{
int i, j;
for (i = 0; i < 3; i++)
@ -148,11 +140,25 @@ static void solve_coefficients(double cm[3][3], double rgb[3][3], const double y
static void calc_coefficients(AVFilterContext *ctx)
{
ColorMatrixContext *color = ctx->priv;
double yuv_coeff[4][3][3];
double rgb_coeffd[4][3][3];
double yuv_convertd[16][3][3];
double bscale, rscale;
int v = 0;
int i, j, k;
for (i = 0; i < 4; i++) {
yuv_coeff[i][0][0] = yuv_coeff_luma[i][0];
yuv_coeff[i][0][1] = yuv_coeff_luma[i][1];
yuv_coeff[i][0][2] = yuv_coeff_luma[i][2];
bscale = 0.5 / (yuv_coeff[i][0][1] - 1.0);
rscale = 0.5 / (yuv_coeff[i][0][2] - 1.0);
yuv_coeff[i][1][0] = bscale * yuv_coeff[i][0][0];
yuv_coeff[i][1][1] = 0.5;
yuv_coeff[i][1][2] = bscale * yuv_coeff[i][0][2];
yuv_coeff[i][2][0] = rscale * yuv_coeff[i][0][0];
yuv_coeff[i][2][1] = rscale * yuv_coeff[i][0][1];
yuv_coeff[i][2][2] = 0.5;
}
for (i = 0; i < 4; i++)
inverse3x3(rgb_coeffd[i], yuv_coeff[i]);
for (i = 0; i < 4; i++) {

2
tests/ref/fate/filter-colormatrix1
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@ -1 +1 @@
colormatrix1 0a0640b2d4ccd4e793f4919d82a89523
colormatrix1 1593e24a71db42d07781b92665cf99a9

2
tests/ref/fate/filter-colormatrix2
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@ -1 +1 @@
colormatrix2 5eb17671c03496ae43723e49832ab17a
colormatrix2 cafba294debb89f59143b519f3cd1673