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Implement getting colors. The mapping between MPlayer's gamma range

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(-100/100) and v4l's range (0-65535) had to be changed a bit to avoid
rounding errors.


git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@18174 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
albeu 2006-04-21 12:47:37 +00:00
parent f865d5a17e
commit 4d418c336f
1 changed files with 24 additions and 17 deletions
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41
libmpdemux/tvi_v4l.c
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@ -964,11 +964,6 @@ static int start(priv_t *priv)
return(1);
}
// 2nd order polynomial with p(-100)=0, p(100)=65535, p(0)=y0
static int poly(int x, int y0)
{
return ((65535-2*y0)*x*x+6553500*x+20000*y0)/20000;
}
static int control(priv_t *priv, int cmd, void *arg)
{
@ -1083,21 +1078,33 @@ static int control(priv_t *priv, int cmd, void *arg)
}
return(TVI_CONTROL_TRUE);
case TVI_CONTROL_VID_SET_BRIGHTNESS:
priv->picture.brightness = 65535*(*(int *)arg+100)/200;
control(priv, TVI_CONTROL_VID_SET_PICTURE, 0);
return(TVI_CONTROL_TRUE);
priv->picture.brightness = (327*(*(int *)arg+100)) + 68;
return control(priv, TVI_CONTROL_VID_SET_PICTURE, 0);
case TVI_CONTROL_VID_SET_HUE:
priv->picture.hue = 65535*(*(int *)arg+100)/200;
control(priv, TVI_CONTROL_VID_SET_PICTURE, 0);
return(TVI_CONTROL_TRUE);
priv->picture.hue = (327*(*(int *)arg+100)) + 68;
return control(priv, TVI_CONTROL_VID_SET_PICTURE, 0);
case TVI_CONTROL_VID_SET_SATURATION:
priv->picture.colour = 65535*(*(int *)arg+100)/200;
control(priv, TVI_CONTROL_VID_SET_PICTURE, 0);
return(TVI_CONTROL_TRUE);
priv->picture.colour = (327*(*(int *)arg+100)) + 68;
return control(priv, TVI_CONTROL_VID_SET_PICTURE, 0);
case TVI_CONTROL_VID_SET_CONTRAST:
priv->picture.contrast = poly(*(int *)arg, 24576);
control(priv, TVI_CONTROL_VID_SET_PICTURE, 0);
return(TVI_CONTROL_TRUE);
priv->picture.contrast = (327*(*(int *)arg+100)) + 68;
return control(priv, TVI_CONTROL_VID_SET_PICTURE, 0);
case TVI_CONTROL_VID_GET_BRIGHTNESS:
if(!control(priv, TVI_CONTROL_VID_GET_PICTURE, 0)) return 0;
*(int*)arg = ((int)priv->picture.brightness-68)/327-100;
return 1;
case TVI_CONTROL_VID_GET_HUE:
if(!control(priv, TVI_CONTROL_VID_GET_PICTURE, 0)) return 0;
*(int*)arg = ((int)priv->picture.hue-68)/327-100;
return 1;
case TVI_CONTROL_VID_GET_SATURATION:
if(!control(priv, TVI_CONTROL_VID_GET_PICTURE, 0)) return 0;
*(int*)arg = ((int)priv->picture.colour-68)/327-100;
return 1;
case TVI_CONTROL_VID_GET_CONTRAST:
if(!control(priv, TVI_CONTROL_VID_GET_PICTURE, 0)) return 0;
*(int*)arg = ((int)priv->picture.contrast-68)/327-100;
return 1;
case TVI_CONTROL_VID_GET_FPS:
*(float *)arg=priv->fps;
return(TVI_CONTROL_TRUE);