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/*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#undef ZERO
#undef HALF
#undef ONE
#undef ftype
#undef SAMPLE_FORMAT
#if DEPTH == 32
#define SAMPLE_FORMAT float
#define ftype float
#define ONE 1.f
#define HALF 0.5f
#define ZERO 0.f
#else
#define SAMPLE_FORMAT double
#define ftype double
#define ONE 1.0
#define HALF 0.5
#define ZERO 0.0
#endif
#define fn3(a,b) a##_##b
#define fn2(a,b) fn3(a,b)
#define fn(a) fn2(a, SAMPLE_FORMAT)
#if DEPTH == 64
static double scalarproduct_double(const double *v1, const double *v2, int len)
{
double p = 0.0;
for (int i = 0; i < len; i++)
p += v1[i] * v2[i];
return p;
}
#endif
static ftype fn(fir_sample)(AudioRLSContext *s, ftype sample, ftype *delay,
ftype *coeffs, ftype *tmp, int *offset)
{
const int order = s->order;
ftype output;
delay[*offset] = sample;
memcpy(tmp, coeffs + order - *offset, order * sizeof(ftype));
#if DEPTH == 32
output = s->fdsp->scalarproduct_float(delay, tmp, s->kernel_size);
#else
output = scalarproduct_double(delay, tmp, s->kernel_size);
#endif
if (--(*offset) < 0)
*offset = order - 1;
return output;
}
static ftype fn(process_sample)(AudioRLSContext *s, ftype input, ftype desired, int ch)
{
ftype *coeffs = (ftype *)s->coeffs->extended_data[ch];
ftype *delay = (ftype *)s->delay->extended_data[ch];
ftype *gains = (ftype *)s->gains->extended_data[ch];
ftype *tmp = (ftype *)s->tmp->extended_data[ch];
ftype *u = (ftype *)s->u->extended_data[ch];
ftype *p = (ftype *)s->p->extended_data[ch];
ftype *dp = (ftype *)s->dp->extended_data[ch];
int *offsetp = (int *)s->offset->extended_data[ch];
const int kernel_size = s->kernel_size;
const int order = s->order;
const ftype lambda = s->lambda;
int offset = *offsetp;
ftype g = lambda;
ftype output, e;
delay[offset + order] = input;
output = fn(fir_sample)(s, input, delay, coeffs, tmp, offsetp);
e = desired - output;
for (int i = 0, pos = offset; i < order; i++, pos++) {
const int ikernel_size = i * kernel_size;
u[i] = ZERO;
for (int k = 0, pos = offset; k < order; k++, pos++)
u[i] += p[ikernel_size + k] * delay[pos];
g += u[i] * delay[pos];
}
g = ONE / g;
for (int i = 0; i < order; i++) {
const int ikernel_size = i * kernel_size;
gains[i] = u[i] * g;
coeffs[i] = coeffs[order + i] = coeffs[i] + gains[i] * e;
tmp[i] = ZERO;
for (int k = 0, pos = offset; k < order; k++, pos++)
tmp[i] += p[ikernel_size + k] * delay[pos];
}
for (int i = 0; i < order; i++) {
const int ikernel_size = i * kernel_size;
for (int k = 0; k < order; k++)
dp[ikernel_size + k] = gains[i] * tmp[k];
}
for (int i = 0; i < order; i++) {
const int ikernel_size = i * kernel_size;
for (int k = 0; k < order; k++)
p[ikernel_size + k] = (p[ikernel_size + k] - (dp[ikernel_size + k] + dp[kernel_size * k + i]) * HALF) * lambda;
}
switch (s->output_mode) {
case IN_MODE: output = input; break;
case DESIRED_MODE: output = desired; break;
case OUT_MODE: output = desired - output; break;
case NOISE_MODE: output = input - output; break;
case ERROR_MODE: break;
}
return output;
}
static int fn(filter_channels)(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
AudioRLSContext *s = ctx->priv;
AVFrame *out = arg;
const int start = (out->ch_layout.nb_channels * jobnr) / nb_jobs;
const int end = (out->ch_layout.nb_channels * (jobnr+1)) / nb_jobs;
for (int c = start; c < end; c++) {
const ftype *input = (const ftype *)s->frame[0]->extended_data[c];
const ftype *desired = (const ftype *)s->frame[1]->extended_data[c];
ftype *output = (ftype *)out->extended_data[c];
for (int n = 0; n < out->nb_samples; n++) {
output[n] = fn(process_sample)(s, input[n], desired[n], c);
if (ctx->is_disabled)
output[n] = input[n];
}
}
return 0;
}
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