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csputils: improve contrast semantics for limited range output

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The previous version of this logic resulted in black crush and incorrect
brightness scaling when combined with limited range (TV) output.
This commit is contained in:
Niklas Haas 2015-04-29 22:04:11 +02:00
parent 0600d378f9
commit 99439f11ea
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GPG Key ID: 3BA77D4BFDB10BCE
1 changed files with 9 additions and 5 deletions
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14
video/csputils.c
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@ -671,18 +671,22 @@ void mp_get_yuv2rgb_coeffs(struct mp_csp_params *params, struct mp_cmat *m)
abort();
}
rgblev.min = (rgblev.min + params->brightness) * params->contrast;
rgblev.max = (rgblev.max + params->brightness) * params->contrast;
double ymul = (rgblev.max - rgblev.min) / (yuvlev.ymax - yuvlev.ymin);
double cmul = (rgblev.max - rgblev.min) / (yuvlev.cmid - yuvlev.cmin) / 2;
// Contrast scales the output value range (gain)
ymul *= params->contrast;
cmul *= params->contrast;
for (int i = 0; i < 3; i++) {
m->m[i][0] *= ymul;
m->m[i][1] *= cmul;
m->m[i][2] *= cmul;
// Set c so that Y=umin,UV=cmid maps to RGB=min (black to black)
// Set c so that Y=umin,UV=cmid maps to RGB=min (black to black),
// also add brightness offset (black lift)
m->c[i] = rgblev.min - m->m[i][0] * yuvlev.ymin
-(m->m[i][1] + m->m[i][2]) * yuvlev.cmid;
- (m->m[i][1] + m->m[i][2]) * yuvlev.cmid
+ params->brightness;
}
int in_bits = FFMAX(params->int_bits_in, 1);