1 /*
2 * This file is part of FFmpeg.
3 *
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19 #include "config.h"
20 #include "libavutil/attributes.h"
21 #include "opusdsp.h"
22
postfilter_c(float *data, int period, float *gains, int len)23 static void postfilter_c(float *data, int period, float *gains, int len)
24 {
25 const float g0 = gains[0];
26 const float g1 = gains[1];
27 const float g2 = gains[2];
28
29 float x4 = data[-period - 2];
30 float x3 = data[-period - 1];
31 float x2 = data[-period + 0];
32 float x1 = data[-period + 1];
33
34 for (int i = 0; i < len; i++) {
35 float x0 = data[i - period + 2];
36 data[i] += g0 * x2 +
37 g1 * (x1 + x3) +
38 g2 * (x0 + x4);
39 x4 = x3;
40 x3 = x2;
41 x2 = x1;
42 x1 = x0;
43 }
44 }
45
deemphasis_c(float *y, float *x, float coeff, int len)46 static float deemphasis_c(float *y, float *x, float coeff, int len)
47 {
48 for (int i = 0; i < len; i++)
49 coeff = y[i] = x[i] + coeff*CELT_EMPH_COEFF;
50
51 return coeff;
52 }
53
ff_opus_dsp_init(OpusDSP *ctx)54 av_cold void ff_opus_dsp_init(OpusDSP *ctx)
55 {
56 ctx->postfilter = postfilter_c;
57 ctx->deemphasis = deemphasis_c;
58
59 #if ARCH_AARCH64
60 ff_opus_dsp_init_aarch64(ctx);
61 #elif ARCH_X86
62 ff_opus_dsp_init_x86(ctx);
63 #endif
64 }
65