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videoconvert: make a constant of scale factor

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This commit is contained in:
Wim Taymans 2013-02-01 11:51:12 +01:00
parent e303b0ad33
commit 9b95f9de95
1 changed files with 11 additions and 8 deletions
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19
gst/videoconvert/videoconvert.c
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@ -138,6 +138,9 @@ videoconvert_convert_convert (VideoConvert * convert,
convert->convert (convert, dest, src);
}
#define SCALE (8)
#define SCALE_F ((float) (1 << SCALE))
static void
videoconvert_convert_matrix (VideoConvert * convert, guint8 * pixels)
{
@ -151,11 +154,11 @@ videoconvert_convert_matrix (VideoConvert * convert, guint8 * pixels)
b = pixels[i * 4 + 3];
y = (convert->cmatrix[0][0] * r + convert->cmatrix[0][1] * g +
convert->cmatrix[0][2] * b + convert->cmatrix[0][3]) >> 8;
convert->cmatrix[0][2] * b + convert->cmatrix[0][3]) >> SCALE;
u = (convert->cmatrix[1][0] * r + convert->cmatrix[1][1] * g +
convert->cmatrix[1][2] * b + convert->cmatrix[1][3]) >> 8;
convert->cmatrix[1][2] * b + convert->cmatrix[1][3]) >> SCALE;
v = (convert->cmatrix[2][0] * r + convert->cmatrix[2][1] * g +
convert->cmatrix[2][2] * b + convert->cmatrix[2][3]) >> 8;
convert->cmatrix[2][2] * b + convert->cmatrix[2][3]) >> SCALE;
pixels[i * 4 + 1] = CLAMP (y, 0, 255);
pixels[i * 4 + 2] = CLAMP (u, 0, 255);
@ -176,11 +179,11 @@ videoconvert_convert_matrix16 (VideoConvert * convert, guint16 * pixels)
b = pixels[i * 4 + 3];
y = (convert->cmatrix[0][0] * r + convert->cmatrix[0][1] * g +
convert->cmatrix[0][2] * b + convert->cmatrix[0][3]) >> 8;
convert->cmatrix[0][2] * b + convert->cmatrix[0][3]) >> SCALE;
u = (convert->cmatrix[1][0] * r + convert->cmatrix[1][1] * g +
convert->cmatrix[1][2] * b + convert->cmatrix[1][3]) >> 8;
convert->cmatrix[1][2] * b + convert->cmatrix[1][3]) >> SCALE;
v = (convert->cmatrix[2][0] * r + convert->cmatrix[2][1] * g +
convert->cmatrix[2][2] * b + convert->cmatrix[2][3]) >> 8;
convert->cmatrix[2][2] * b + convert->cmatrix[2][3]) >> SCALE;
pixels[i * 4 + 1] = CLAMP (y, 0, 65535);
pixels[i * 4 + 2] = CLAMP (u, 0, 65535);
@ -308,8 +311,8 @@ videoconvert_convert_compute_matrix (VideoConvert * convert)
color_matrix_offset_components (&dst, offset[0], offset[1], offset[2]);
/* because we're doing 8-bit matrix coefficients */
color_matrix_scale_components (&dst, 256.0, 256.0, 256.0);
/* because we're doing fixed point matrix coefficients */
color_matrix_scale_components (&dst, SCALE_F, SCALE_F, SCALE_F);
for (i = 0; i < 4; i++)
for (j = 0; j < 4; j++)