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/* libDSP - a digital signal processing library
* Copyright © 2017-2023 Ilia Platone
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "dsp.h"
void dsp_convolution_convolution(dsp_stream_p stream, dsp_stream_p matrix) {
int x, y, d;
dsp_t mn = dsp_stats_min(stream->buf, stream->len);
dsp_t mx = dsp_stats_max(stream->buf, stream->len);
int* d_pos = (int*)malloc(sizeof(int)*stream->dims);
for(y = 0; y < matrix->len; y++) {
int* pos = dsp_stream_get_position(matrix, y);
for(d = 0; d < stream->dims; d++) {
d_pos[d] = stream->sizes[d]/2+pos[d]-matrix->sizes[d]/2;
}
x = dsp_stream_set_position(stream, d_pos);
free(pos);
if(x >= 0 && x < stream->magnitude->len)
stream->magnitude->buf[x] *= sqrt(matrix->magnitude->buf[y]);
}
free(d_pos);
dsp_fourier_idft(stream);
dsp_buffer_stretch(stream->buf, stream->len, mn, mx);
}
void dsp_convolution_correlation(dsp_stream_p stream, dsp_stream_p matrix) {
int x, y, d;
dsp_t mn = dsp_stats_min(stream->buf, stream->len);
dsp_t mx = dsp_stats_max(stream->buf, stream->len);
int* d_pos = (int*)malloc(sizeof(int)*stream->dims);
dsp_buffer_shift(matrix->magnitude);
for(y = 0; y < matrix->len; y++) {
int* pos = dsp_stream_get_position(matrix, y);
for(d = 0; d < stream->dims; d++) {
d_pos[d] = stream->sizes[d]/2+pos[d]-matrix->sizes[d]/2;
}
x = dsp_stream_set_position(stream, d_pos);
free(pos);
stream->magnitude->buf[x] *= sqrt(matrix->magnitude->buf[y]);
}
dsp_buffer_shift(matrix->magnitude);
free(d_pos);
dsp_fourier_idft(stream);
dsp_buffer_stretch(stream->buf, stream->len, mn, mx);
}
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