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colorspace: Add jpeg color-matrix conversion

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This commit is contained in:
David Schleef 2011-08-18 19:49:08 -07:00
parent f02ee5b403
commit 70684f4d1b
1 changed files with 27 additions and 0 deletions
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27
gst/colorspace/colorspace.c
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@ -1539,6 +1539,28 @@ matrix_yuv_bt470_6_to_yuv_bt709 (ColorspaceConvert * convert)
}
}
static void
matrix_yuv_jpeg_to_bt470_6 (ColorspaceConvert * convert)
{
int i;
int y, u, v;
guint8 *tmpline = convert->tmpline;
for (i = 0; i < convert->width; i++) {
y = tmpline[i * 4 + 1];
u = tmpline[i * 4 + 2];
v = tmpline[i * 4 + 3];
y = (220 * y + 16 * 256 + 128) >> 8;
//u = (261 * u + 29 * v - 4367) >> 8;
//v = (19 * u + 262 * v - 3289) >> 8;
tmpline[i * 4 + 1] = CLAMP (y, 0, 255);
tmpline[i * 4 + 2] = CLAMP (u, 0, 255);
tmpline[i * 4 + 3] = CLAMP (v, 0, 255);
}
}
static void
matrix_identity (ColorspaceConvert * convert)
{
@ -1750,6 +1772,11 @@ colorspace_convert_lookup_getput (ColorspaceConvert * convert)
&& convert->to_spec == COLOR_SPEC_YUV_BT709) {
convert->matrix = matrix_yuv_bt470_6_to_yuv_bt709;
convert->matrix16 = matrix16_yuv_bt470_6_to_yuv_bt709;
} else if (convert->from_spec == COLOR_SPEC_YUV_JPEG
&& convert->to_spec == COLOR_SPEC_YUV_BT470_6) {
convert->matrix = matrix_yuv_jpeg_to_bt470_6;
//convert->matrix16 = matrix16_yuv_jpeg_to_bt470_6;
convert->matrix16 = matrix16_identity;
}
}