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avfilter/af_anlmdn: add smooth factor option

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This commit is contained in:
Paul B Mahol 2019-06-02 11:58:49 +02:00
parent cbaa60329a
commit b535577465
2 changed files with 8 additions and 3 deletions
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3
doc/filters.texi
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@ -1801,6 +1801,9 @@ Pass only noise.
Default value is @var{o}.
@end table
@item m
Set smooth factor. Default value is @var{11}. Allowed range is from @var{1} to @var{15}.
@end table
@section anull

8
libavfilter/af_anlmdn.c
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@ -29,7 +29,6 @@
#include "af_anlmdndsp.h"
#define MAX_DIFF 11.f
#define WEIGHT_LUT_NBITS 20
#define WEIGHT_LUT_SIZE (1<<WEIGHT_LUT_NBITS)
@ -41,6 +40,7 @@ typedef struct AudioNLMeansContext {
float a;
int64_t pd;
int64_t rd;
float m;
int om;
float pdiff_lut_scale;
@ -81,6 +81,7 @@ static const AVOption anlmdn_options[] = {
{ "i", "input", 0, AV_OPT_TYPE_CONST, {.i64=IN_MODE}, 0, 0, AF, "mode" },
{ "o", "output", 0, AV_OPT_TYPE_CONST, {.i64=OUT_MODE}, 0, 0, AF, "mode" },
{ "n", "noise", 0, AV_OPT_TYPE_CONST, {.i64=NOISE_MODE},0, 0, AF, "mode" },
{ "m", "set smooth factor", OFFSET(m), AV_OPT_TYPE_FLOAT, {.dbl=11.}, 1, 15, AF },
{ NULL }
};
@ -178,7 +179,7 @@ static int config_output(AVFilterLink *outlink)
if (ret < 0)
return ret;
s->pdiff_lut_scale = 1.f / MAX_DIFF * WEIGHT_LUT_SIZE;
s->pdiff_lut_scale = 1.f / s->m * WEIGHT_LUT_SIZE;
for (int i = 0; i < WEIGHT_LUT_SIZE; i++) {
float w = -i / s->pdiff_lut_scale;
@ -201,6 +202,7 @@ static int filter_channel(AVFilterContext *ctx, void *arg, int ch, int nb_jobs)
float *cache = (float *)s->cache->extended_data[ch];
const float sw = (65536.f / (4 * K + 2)) / sqrtf(s->a);
float *dst = (float *)out->extended_data[ch] + s->offset;
const float smooth = s->m;
for (int i = S; i < s->H + S; i++) {
float P = 0.f, Q = 0.f;
@ -224,7 +226,7 @@ static int filter_channel(AVFilterContext *ctx, void *arg, int ch, int nb_jobs)
av_assert2(distance >= 0.f);
w = distance * sw;
if (w >= MAX_DIFF)
if (w >= smooth)
continue;
weight_lut_idx = w * s->pdiff_lut_scale;
av_assert2(weight_lut_idx < WEIGHT_LUT_SIZE);