virtualenv/FFmpeg
1
0
Fork 0
mirror of https://github.com/FFmpeg/FFmpeg.git synced 2025-08-10 06:10:52 +02:00
Code Issues Releases Activity

avfilter/af_anlms: improve documentation and extend option

Browse Source
This commit is contained in:
Paul B Mahol
2023-05-01 20:01:50 +02:00
parent f09280dfc4
commit 5617465916
2 changed files with 12 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
doc/filters.texi
View File

@@ -2674,10 +2674,13 @@ Pass the 1st input.
Pass the 2nd input. Pass the 2nd input.
@item o @item o
Pass filtered samples. Pass difference between desired, 2nd input and error signal estimate.
@item n @item n
Pass difference between desired and filtered samples. Pass difference between input, 1st input and error signal estimate.
@item e
Pass error signal estimated samples.
Default value is @var{o}. Default value is @var{o}.
@end table @end table

11
libavfilter/af_anlms.c
View File

@@ -34,6 +34,7 @@ enum OutModes {
DESIRED_MODE, DESIRED_MODE,
OUT_MODE, OUT_MODE,
NOISE_MODE, NOISE_MODE,
ERROR_MODE,
NB_OMODES NB_OMODES
}; };
@@ -73,6 +74,7 @@ static const AVOption anlms_options[] = {
{ "d", "desired", 0, AV_OPT_TYPE_CONST, {.i64=DESIRED_MODE}, 0, 0, AT, "mode" }, { "d", "desired", 0, AV_OPT_TYPE_CONST, {.i64=DESIRED_MODE}, 0, 0, AT, "mode" },
{ "o", "output", 0, AV_OPT_TYPE_CONST, {.i64=OUT_MODE}, 0, 0, AT, "mode" }, { "o", "output", 0, AV_OPT_TYPE_CONST, {.i64=OUT_MODE}, 0, 0, AT, "mode" },
{ "n", "noise", 0, AV_OPT_TYPE_CONST, {.i64=NOISE_MODE}, 0, 0, AT, "mode" }, { "n", "noise", 0, AV_OPT_TYPE_CONST, {.i64=NOISE_MODE}, 0, 0, AT, "mode" },
{ "e", "error", 0, AV_OPT_TYPE_CONST, {.i64=ERROR_MODE}, 0, 0, AT, "mode" },
{ NULL } { NULL }
}; };
@@ -102,7 +104,7 @@ static float process_sample(AudioNLMSContext *s, float input, float desired,
const int order = s->order; const int order = s->order;
const float leakage = s->leakage; const float leakage = s->leakage;
const float mu = s->mu; const float mu = s->mu;
const float a = 1.f - leakage * mu; const float a = 1.f - leakage;
float sum, output, e, norm, b; float sum, output, e, norm, b;
int offset = *offsetp; int offset = *offsetp;
@@ -116,7 +118,7 @@ static float process_sample(AudioNLMSContext *s, float input, float desired,
norm = s->eps + sum; norm = s->eps + sum;
b = mu * e / norm; b = mu * e / norm;
if (s->anlmf) if (s->anlmf)
b *= 4.f * e * e; b *= e * e;
memcpy(tmp, delay + offset, order * sizeof(float)); memcpy(tmp, delay + offset, order * sizeof(float));
@@ -129,8 +131,9 @@ static float process_sample(AudioNLMSContext *s, float input, float desired,
switch (s->output_mode) { switch (s->output_mode) {
case IN_MODE: output = input; break; case IN_MODE: output = input; break;
case DESIRED_MODE: output = desired; break; case DESIRED_MODE: output = desired; break;
case OUT_MODE: /*output = output;*/ break; case OUT_MODE: output = desired - output; break;
case NOISE_MODE: output = desired - output; break; case NOISE_MODE: output = input - output; break;
case ERROR_MODE: break;
} }
return output; return output;
} }