*
* Copyright (c) 2008 Vladimir Voroshilov
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav 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,
+ * Libav 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
+ * License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <inttypes.h>
+#include "libavutil/common.h"
#include "avcodec.h"
#include "acelp_filters.h"
{
int n, i;
- assert(pitch_delay_frac >= 0 && pitch_delay_frac < precision);
+ assert(frac_pos >= 0 && frac_pos < precision);
for (n = 0; n < length; n++) {
int idx = 0;
}
}
+void ff_acelp_interpolatef(float *out, const float *in,
+ const float *filter_coeffs, int precision,
+ int frac_pos, int filter_length, int length)
+{
+ int n, i;
+
+ for (n = 0; n < length; n++) {
+ int idx = 0;
+ float v = 0;
+
+ for (i = 0; i < filter_length;) {
+ v += in[n + i] * filter_coeffs[idx + frac_pos];
+ idx += precision;
+ i++;
+ v += in[n - i] * filter_coeffs[idx - frac_pos];
+ }
+ out[n] = v;
+ }
+}
+
void ff_acelp_high_pass_filter(int16_t* out, int hpf_f[2],
const int16_t* in, int length)
}
}
-void ff_acelp_apply_order_2_transfer_function(float *buf,
+void ff_acelp_apply_order_2_transfer_function(float *out, const float *in,
const float zero_coeffs[2],
const float pole_coeffs[2],
float gain, float mem[2], int n)
float tmp;
for (i = 0; i < n; i++) {
- tmp = gain * buf[i] - pole_coeffs[0] * mem[0] - pole_coeffs[1] * mem[1];
- buf[i] = tmp + zero_coeffs[0] * mem[0] + zero_coeffs[1] * mem[1];
+ tmp = gain * in[i] - pole_coeffs[0] * mem[0] - pole_coeffs[1] * mem[1];
+ out[i] = tmp + zero_coeffs[0] * mem[0] + zero_coeffs[1] * mem[1];
mem[1] = mem[0];
mem[0] = tmp;
}
}
+
+void ff_tilt_compensation(float *mem, float tilt, float *samples, int size)
+{
+ float new_tilt_mem = samples[size - 1];
+ int i;
+
+ for (i = size - 1; i > 0; i--)
+ samples[i] -= tilt * samples[i - 1];
+
+ samples[0] -= tilt * *mem;
+ *mem = new_tilt_mem;
+}