1 /*
2 * Copyright (c) 2017 Paul B Mahol
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 #ifndef AVFILTER_AFIRDSP_H
22 #define AVFILTER_AFIRDSP_H
23
24 #include <stddef.h>
25
26 #include "config.h"
27 #include "libavutil/attributes.h"
28
29 typedef struct AudioFIRDSPContext {
30 void (*fcmul_add)(float *sum, const float *t, const float *c,
31 ptrdiff_t len);
32 void (*dcmul_add)(double *sum, const double *t, const double *c,
33 ptrdiff_t len);
34 } AudioFIRDSPContext;
35
36 void ff_afir_init_x86(AudioFIRDSPContext *s);
37
fcmul_add_c(float * sum,const float * t,const float * c,ptrdiff_t len)38 static void fcmul_add_c(float *sum, const float *t, const float *c, ptrdiff_t len)
39 {
40 int n;
41
42 for (n = 0; n < len; n++) {
43 const float cre = c[2 * n ];
44 const float cim = c[2 * n + 1];
45 const float tre = t[2 * n ];
46 const float tim = t[2 * n + 1];
47
48 sum[2 * n ] += tre * cre - tim * cim;
49 sum[2 * n + 1] += tre * cim + tim * cre;
50 }
51
52 sum[2 * n] += t[2 * n] * c[2 * n];
53 }
54
dcmul_add_c(double * sum,const double * t,const double * c,ptrdiff_t len)55 static void dcmul_add_c(double *sum, const double *t, const double *c, ptrdiff_t len)
56 {
57 int n;
58
59 for (n = 0; n < len; n++) {
60 const double cre = c[2 * n ];
61 const double cim = c[2 * n + 1];
62 const double tre = t[2 * n ];
63 const double tim = t[2 * n + 1];
64
65 sum[2 * n ] += tre * cre - tim * cim;
66 sum[2 * n + 1] += tre * cim + tim * cre;
67 }
68
69 sum[2 * n] += t[2 * n] * c[2 * n];
70 }
71
ff_afir_init(AudioFIRDSPContext * dsp)72 static av_unused void ff_afir_init(AudioFIRDSPContext *dsp)
73 {
74 dsp->fcmul_add = fcmul_add_c;
75 dsp->dcmul_add = dcmul_add_c;
76
77 #if ARCH_X86
78 ff_afir_init_x86(dsp);
79 #endif
80 }
81
82 #endif /* AVFILTER_AFIRDSP_H */
83