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avfilter/vf_w3fdif: scale down coefficiends by 2

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Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol 2015-10-07 23:27:14 +02:00
parent 71199ee907
commit 4e7fa057d2
1 changed files with 7 additions and 7 deletions
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14
libavfilter/vf_w3fdif.c
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@ -122,7 +122,7 @@ static int config_output(AVFilterLink *outlink)
}
/*
* Filter coefficients from PH-2071, scaled by 256 * 256.
* Filter coefficients from PH-2071, scaled by 256 * 128.
* Each set of coefficients has a set for low-frequencies and high-frequencies.
* n_coef_lf[] and n_coef_hf[] are the number of coefs for simple and more-complex.
* It is important for later that n_coef_lf[] is even and n_coef_hf[] is odd.
@ -130,11 +130,11 @@ static int config_output(AVFilterLink *outlink)
* and high-frequencies for simple and more-complex mode.
*/
static const int8_t n_coef_lf[2] = { 2, 4 };
static const int32_t coef_lf[2][4] = {{ 32768, 32768, 0, 0},
{ -1704, 34472, 34472, -1704}};
static const int16_t coef_lf[2][4] = {{ 16384, 16384, 0, 0},
{ -852, 17236, 17236, -852}};
static const int8_t n_coef_hf[2] = { 3, 5 };
static const int32_t coef_hf[2][5] = {{ -4096, 8192, -4096, 0, 0},
{ 2032, -7602, 11140, -7602, 2032}};
static const int16_t coef_hf[2][5] = {{ -2048, 4096, -2048, 0, 0},
{ 1016, -3801, 5570, -3801, 1016}};
typedef struct ThreadData {
AVFrame *out, *cur, *adj;
@ -256,12 +256,12 @@ static int deinterlace_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_
}
}
/* save scaled result to the output frame, scaling down by 256 * 256 */
/* save scaled result to the output frame, scaling down by 256 * 128 */
work_pixel = s->work_line[jobnr];
out_pixel = out_line;
for (j = 0; j < linesize; j++, out_pixel++, work_pixel++)
*out_pixel = av_clip(*work_pixel, 0, 255 * 256 * 256) >> 16;
*out_pixel = av_clip(*work_pixel, 0, 255 * 256 * 128) >> 15;
/* move on to next line */
y_out += 2;