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avfilter/af_afftdn: use RDFT instead 

Makes spectral filtering less crude.
This commit is contained in:
Paul B Mahol 2022-03-12 18:18:09 +01:00
parent b8af574477
commit df8163ae55
1 changed files with 16 additions and 24 deletions
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40
libavfilter/af_afftdn.c
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@ -66,7 +66,7 @@ typedef struct DeNoiseChannel {
double *abs_var;
double *rel_var;
double *min_abs_var;
AVComplexFloat *fft_in;
float *fft_in;
AVComplexFloat *fft_out;
AVTXContext *fft, *ifft;
av_tx_fn tx_fn, itx_fn;
@ -606,7 +606,7 @@ static int config_input(AVFilterLink *inlink)
s->sample_advance = s->sample_rate / 80;
s->window_length = 3 * s->sample_advance;
s->fft_length2 = 1 << (32 - ff_clz(s->window_length));
s->fft_length = s->fft_length2 * 2;
s->fft_length = s->fft_length2;
s->buffer_length = s->fft_length * 2;
s->bin_count = s->fft_length2 + 1;
@ -662,7 +662,7 @@ static int config_input(AVFilterLink *inlink)
for (int ch = 0; ch < inlink->channels; ch++) {
DeNoiseChannel *dnch = &s->dnch[ch];
float scale = 0.f;
float scale = 1.f;
switch (s->noise_type) {
case WHITE_NOISE:
@ -711,12 +711,12 @@ static int config_input(AVFilterLink *inlink)
dnch->abs_var = av_calloc(s->bin_count, sizeof(*dnch->abs_var));
dnch->rel_var = av_calloc(s->bin_count, sizeof(*dnch->rel_var));
dnch->min_abs_var = av_calloc(s->bin_count, sizeof(*dnch->min_abs_var));
dnch->fft_in = av_calloc(s->fft_length2 + 1, sizeof(*dnch->fft_in));
dnch->fft_in = av_calloc(s->fft_length2, sizeof(*dnch->fft_in));
dnch->fft_out = av_calloc(s->fft_length2 + 1, sizeof(*dnch->fft_out));
ret = av_tx_init(&dnch->fft, &dnch->tx_fn, AV_TX_FLOAT_FFT, 0, s->fft_length2, &scale, 0);
ret = av_tx_init(&dnch->fft, &dnch->tx_fn, AV_TX_FLOAT_RDFT, 0, s->fft_length2, &scale, 0);
if (ret < 0)
return ret;
ret = av_tx_init(&dnch->ifft, &dnch->itx_fn, AV_TX_FLOAT_FFT, 1, s->fft_length2, &scale, 0);
ret = av_tx_init(&dnch->ifft, &dnch->itx_fn, AV_TX_FLOAT_RDFT, 1, s->fft_length2, &scale, 0);
if (ret < 0)
return ret;
dnch->spread_function = av_calloc(s->number_of_bands * s->number_of_bands,
@ -816,7 +816,7 @@ static int config_input(AVFilterLink *inlink)
if (!s->winframe)
return AVERROR(ENOMEM);
wscale = sqrt(16.0 / (9.0 * s->fft_length));
wscale = sqrt(8.0 / (9.0 * s->fft_length));
sum = 0.0;
for (int i = 0; i < s->window_length; i++) {
double d10 = sin(i * M_PI / s->window_length);
@ -863,15 +863,11 @@ static void sample_noise_block(AudioFFTDeNoiseContext *s,
double mag2, var = 0.0, avr = 0.0, avi = 0.0;
int edge, j, k, n, edgemax;
for (int i = 0; i < s->window_length; i++) {
dnch->fft_in[i].re = s->window[i] * src[i] * (1LL << 23);
dnch->fft_in[i].im = 0.0;
}
for (int i = 0; i < s->window_length; i++)
dnch->fft_in[i] = s->window[i] * src[i] * (1LL << 23);
for (int i = s->window_length; i < s->fft_length2; i++) {
dnch->fft_in[i].re = 0.0;
dnch->fft_in[i].im = 0.0;
}
for (int i = s->window_length; i < s->fft_length2; i++)
dnch->fft_in[i] = 0.0;
dnch->tx_fn(dnch->fft, dnch->fft_out, dnch->fft_in, sizeof(float));
@ -1013,15 +1009,11 @@ static int filter_channel(AVFilterContext *ctx, void *arg, int jobnr, int nb_job
dnch->sfm_threshold += dnch->sfm_alpha * (0.5 + (1.0 / 640) * dnch->sfm_fail_total);
}
for (int m = 0; m < s->window_length; m++) {
dnch->fft_in[m].re = s->window[m] * src[m] * (1LL << 23);
dnch->fft_in[m].im = 0;
}
for (int m = 0; m < s->window_length; m++)
dnch->fft_in[m] = s->window[m] * src[m] * (1LL << 23);
for (int m = s->window_length; m < s->fft_length2; m++) {
dnch->fft_in[m].re = 0;
dnch->fft_in[m].im = 0;
}
for (int m = s->window_length; m < s->fft_length2; m++)
dnch->fft_in[m] = 0;
dnch->tx_fn(dnch->fft, dnch->fft_out, dnch->fft_in, sizeof(float));
@ -1033,7 +1025,7 @@ static int filter_channel(AVFilterContext *ctx, void *arg, int jobnr, int nb_job
dnch->itx_fn(dnch->ifft, dnch->fft_in, dnch->fft_out, sizeof(float));
for (int m = 0; m < s->window_length; m++)
dst[m] += s->window[m] * dnch->fft_in[m].re / (1LL << 23);
dst[m] += s->window[m] * dnch->fft_in[m] / (1LL << 23);
}
return 0;