| /* Effect: change sample rate Copyright (c) 2008,12 robs@users.sourceforge.net |
| * |
| * This library 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. |
| * |
| * This library 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 this library; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| /* Resample using a non-interpolated poly-phase FIR with length LEN.*/ |
| /* Input must be followed by LEN-1 samples. */ |
| |
| #define _ sum += (coef(p->shared->poly_fir_coefs, 0, FIR_LENGTH, divided.rem, 0, j)) *at[j], ++j; |
| |
| static void FUNCTION(stage_t * p, fifo_t * output_fifo) |
| { |
| sample_t const * input = stage_read_p(p); |
| int i, num_in = stage_occupancy(p), max_num_out = 1 + num_in*p->out_in_ratio; |
| sample_t * output = fifo_reserve(output_fifo, max_num_out); |
| div_t divided2; |
| |
| for (i = 0; p->at.parts.integer < num_in * p->L; ++i, p->at.parts.integer += p->step.parts.integer) { |
| div_t divided = div(p->at.parts.integer, p->L); |
| sample_t const * at = input + divided.quot; |
| sample_t sum = 0; |
| int j = 0; |
| CONVOLVE |
| output[i] = sum; |
| } |
| assert(max_num_out - i >= 0); |
| fifo_trim_by(output_fifo, max_num_out - i); |
| divided2 = div(p->at.parts.integer, p->L); |
| fifo_read(&p->fifo, divided2.quot, NULL); |
| p->at.parts.integer = divided2.rem; |
| } |
| |
| #undef _ |
| #undef CONVOLVE |
| #undef FIR_LENGTH |
| #undef FUNCTION |
