/* * 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 ONE#undef ftype#undef SAMPLE_FORMAT#if DEPTH == 32#define SAMPLE_FORMAT float#define ftype float#define ONE 1.f#define ZERO 0.f#else#define SAMPLE_FORMAT double#define ftype double#define ONE 1.0#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) static ftype fn(fir_sample)(AudioAPContext *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 = s->fdsp->scalarproduct_double(delay, tmp, s->kernel_size);#endif     if (--(*offset) < 0)        *offset = order - 1;     return output;} static int fn(lup_decompose)(ftype **MA, const int N, const ftype tol, int *P){    for (int i = 0; i <= N; i++)        P[i] = i;     for (int i = 0; i < N; i++) {        ftype maxA = ZERO;        int imax = i;         for (int k = i; k < N; k++) {            ftype absA = fabs(MA[k][i]);            if (absA > maxA) {                maxA = absA;                imax = k;            }        }         if (maxA < tol)            return 0;         if (imax != i) {            FFSWAP(int, P[i], P[imax]);            FFSWAP(ftype *, MA[i], MA[imax]);            P[N]++;        }         for (int j = i + 1; j < N; j++) {            MA[j][i] /= MA[i][i];             for (int k = i + 1; k < N; k++)                MA[j][k] -= MA[j][i] * MA[i][k];        }    }     return 1;} static void fn(lup_invert)(ftype *const *MA, const int *P, const int N, ftype **IA){    for (int j = 0; j < N; j++) {        for (int i = 0; i < N; i++) {            IA[i][j] = P[i] == j ? ONE : ZERO;             for (int k = 0; k < i; k++)                IA[i][j] -= MA[i][k] * IA[k][j];        }         for (int i = N - 1; i >= 0; i--) {            for (int k = i + 1; k < N; k++)                IA[i][j] -= MA[i][k] * IA[k][j];             IA[i][j] /= MA[i][i];        }    }} static ftype fn(process_sample)(AudioAPContext *s, ftype input, ftype desired, int ch){    ftype *dcoeffs = (ftype *)s->dcoeffs->extended_data[ch];    ftype *coeffs = (ftype *)s->coeffs->extended_data[ch];    ftype *delay = (ftype *)s->delay->extended_data[ch];    ftype **itmpmp = (ftype **)&s->itmpmp[s->projection * ch];    ftype **tmpmp = (ftype **)&s->tmpmp[s->projection * ch];    ftype *tmpm = (ftype *)s->tmpm->extended_data[ch];    ftype *tmp = (ftype *)s->tmp->extended_data[ch];    ftype *e = (ftype *)s->e->extended_data[ch];    ftype *x = (ftype *)s->x->extended_data[ch];    ftype *w = (ftype *)s->w->extended_data[ch];    int *p = (int *)s->p->extended_data[ch];    int *offset = (int *)s->offset->extended_data[ch];    const int projection = s->projection;    const ftype delta = s->delta;    const int order = s->order;    const int length = projection + order;    const ftype mu = s->mu;    const ftype tol = 0.00001f;    ftype output;     x[offset[2] + length] = x[offset[2]] = input;    delay[offset[0] + order] = input;     output = fn(fir_sample)(s, input, delay, coeffs, tmp, offset);    e[offset[1]] = e[offset[1] + projection] = desired - output;     for (int i = 0; i < projection; i++) {        const int iprojection = i * projection;         for (int j = i; j < projection; j++) {            ftype sum = ZERO;            for (int k = 0; k < order; k++)                sum += x[offset[2] + i + k] * x[offset[2] + j + k];            tmpm[iprojection + j] = sum;            if (i != j)                tmpm[j * projection + i] = sum;        }         tmpm[iprojection + i] += delta;    }     fn(lup_decompose)(tmpmp, projection, tol, p);    fn(lup_invert)(tmpmp, p, projection, itmpmp);     for (int i = 0; i < projection; i++) {        ftype sum = ZERO;        for (int j = 0; j < projection; j++)            sum += itmpmp[i][j] * e[j + offset[1]];        w[i] = sum;    }     for (int i = 0; i < order; i++) {        ftype sum = ZERO;        for (int j = 0; j < projection; j++)            sum += x[offset[2] + i + j] * w[j];        dcoeffs[i] = sum;    }     for (int i = 0; i < order; i++)        coeffs[i] = coeffs[i + order] = coeffs[i] + mu * dcoeffs[i];     if (--offset[1] < 0)        offset[1] = projection - 1;     if (--offset[2] < 0)        offset[2] = length - 1;     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){    AudioAPContext *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;}