FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/acelp_filters.c
Date: 2025-12-16 02:06:53
Exec Total Coverage
Lines: 29 51 56.9%
Functions: 4 6 66.7%
Branches: 8 16 50.0%
Line Branch Exec Source
1 /*
2 * various filters for ACELP-based codecs
3 *
4 * Copyright (c) 2008 Vladimir Voroshilov
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23 #include <stddef.h>
24 #include <stdint.h>
25
26 #include "config.h"
27 #include "libavutil/avassert.h"
28 #include "libavutil/common.h"
29 #include "libavutil/log.h"
30 #include "acelp_filters.h"
31
32 const int16_t ff_acelp_interp_filter[61] = { /* (0.15) */
33 29443, 28346, 25207, 20449, 14701, 8693,
34 3143, -1352, -4402, -5865, -5850, -4673,
35 -2783, -672, 1211, 2536, 3130, 2991,
36 2259, 1170, 0, -1001, -1652, -1868,
37 -1666, -1147, -464, 218, 756, 1060,
38 1099, 904, 550, 135, -245, -514,
39 -634, -602, -451, -231, 0, 191,
40 308, 340, 296, 198, 78, -36,
41 -120, -163, -165, -132, -79, -19,
42 34, 73, 91, 89, 70, 38,
43 0,
44 };
45
46 ✗ void ff_acelp_interpolate(int16_t* out, const int16_t* in,
47 const int16_t* filter_coeffs, int precision,
48 int frac_pos, int filter_length, int length)
49 {
50 int n, i;
51
52 av_assert1(frac_pos >= 0 && frac_pos < precision);
53
54 ✗ for (n = 0; n < length; n++) {
55 ✗ int idx = 0;
56 ✗ int v = 0x4000;
57
58 ✗ for (i = 0; i < filter_length;) {
59
60 /* The reference G.729 and AMR fixed point code performs clipping after
61 each of the two following accumulations.
62 Since clipping affects only the synthetic OVERFLOW test without
63 causing an int type overflow, it was moved outside the loop. */
64
65 /* R(x):=ac_v[-k+x]
66 v += R(n-i)*ff_acelp_interp_filter(t+6i)
67 v += R(n+i+1)*ff_acelp_interp_filter(6-t+6i) */
68
69 ✗ v += in[n + i] * filter_coeffs[idx + frac_pos];
70 ✗ idx += precision;
71 ✗ i++;
72 ✗ v += in[n - i] * filter_coeffs[idx - frac_pos];
73 }
74 ✗ if (av_clip_int16(v >> 15) != (v >> 15))
75 ✗ av_log(NULL, AV_LOG_WARNING, "overflow that would need clipping in ff_acelp_interpolate()\n");
76 ✗ out[n] = v >> 15;
77 }
78 ✗ }
79
80 79164 void ff_acelp_interpolatef(float *out, const float *in,
81 const float *filter_coeffs, int precision,
82 int frac_pos, int filter_length, int length)
83 {
84 int n, i;
85
86
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 3631588 for (n = 0; n < length; n++) {
87 3552424 int idx = 0;
88 3552424 float v = 0;
89
90
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 48495464 for (i = 0; i < filter_length;) {
91 44943040 v += in[n + i] * filter_coeffs[idx + frac_pos];
92 44943040 idx += precision;
93 44943040 i++;
94 44943040 v += in[n - i] * filter_coeffs[idx - frac_pos];
95 }
96 3552424 out[n] = v;
97 }
98 79164 }
99
100
101 ✗ void ff_acelp_high_pass_filter(int16_t* out, int hpf_f[2],
102 const int16_t* in, int length)
103 {
104 int i;
105 int tmp;
106
107 ✗ for (i = 0; i < length; i++) {
108 ✗ tmp = (hpf_f[0]* 15836LL) >> 13;
109 ✗ tmp += (hpf_f[1]* -7667LL) >> 13;
110 ✗ tmp += 7699 * (in[i] - 2*in[i-1] + in[i-2]);
111
112 /* With "+0x800" rounding, clipping is needed
113 for ALGTHM and SPEECH tests. */
114 ✗ out[i] = av_clip_int16((tmp + 0x800) >> 12);
115
116 ✗ hpf_f[1] = hpf_f[0];
117 ✗ hpf_f[0] = tmp;
118 }
119 ✗ }
120
121 57618 void ff_acelp_apply_order_2_transfer_function(float *out, const float *in,
122 const float zero_coeffs[2],
123 const float pole_coeffs[2],
124 float gain, float mem[2], int n)
125 {
126 int i;
127 float tmp;
128
129
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 4444338 for (i = 0; i < n; i++) {
130 4386720 tmp = gain * in[i] - pole_coeffs[0] * mem[0] - pole_coeffs[1] * mem[1];
131 4386720 out[i] = tmp + zero_coeffs[0] * mem[0] + zero_coeffs[1] * mem[1];
132
133 4386720 mem[1] = mem[0];
134 4386720 mem[0] = tmp;
135 }
136 57618 }
137
138 20101 void ff_tilt_compensation(float *mem, float tilt, float *samples, int size)
139 {
140 20101 float new_tilt_mem = samples[size - 1];
141 int i;
142
143
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 759712 for (i = size - 1; i > 0; i--)
144 739611 samples[i] -= tilt * samples[i - 1];
145
146 20101 samples[0] -= tilt * *mem;
147 20101 *mem = new_tilt_mem;
148 20101 }
149
150 42 av_cold void ff_acelp_filter_init(ACELPFContext *c)
151 {
152 42 c->acelp_interpolatef = ff_acelp_interpolatef;
153 42 c->acelp_apply_order_2_transfer_function = ff_acelp_apply_order_2_transfer_function;
154
155 #if HAVE_MIPSFPU
156 ff_acelp_filter_init_mips(c);
157 #endif
158 42 }
159