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 <inttypes.h> |
24 |
|
|
|
25 |
|
|
#include "libavutil/avassert.h" |
26 |
|
|
#include "libavutil/common.h" |
27 |
|
|
#include "avcodec.h" |
28 |
|
|
#include "acelp_filters.h" |
29 |
|
|
|
30 |
|
|
const int16_t ff_acelp_interp_filter[61] = { /* (0.15) */ |
31 |
|
|
29443, 28346, 25207, 20449, 14701, 8693, |
32 |
|
|
3143, -1352, -4402, -5865, -5850, -4673, |
33 |
|
|
-2783, -672, 1211, 2536, 3130, 2991, |
34 |
|
|
2259, 1170, 0, -1001, -1652, -1868, |
35 |
|
|
-1666, -1147, -464, 218, 756, 1060, |
36 |
|
|
1099, 904, 550, 135, -245, -514, |
37 |
|
|
-634, -602, -451, -231, 0, 191, |
38 |
|
|
308, 340, 296, 198, 78, -36, |
39 |
|
|
-120, -163, -165, -132, -79, -19, |
40 |
|
|
34, 73, 91, 89, 70, 38, |
41 |
|
|
0, |
42 |
|
|
}; |
43 |
|
|
|
44 |
|
|
void ff_acelp_interpolate(int16_t* out, const int16_t* in, |
45 |
|
|
const int16_t* filter_coeffs, int precision, |
46 |
|
|
int frac_pos, int filter_length, int length) |
47 |
|
|
{ |
48 |
|
|
int n, i; |
49 |
|
|
|
50 |
|
|
av_assert1(frac_pos >= 0 && frac_pos < precision); |
51 |
|
|
|
52 |
|
|
for (n = 0; n < length; n++) { |
53 |
|
|
int idx = 0; |
54 |
|
|
int v = 0x4000; |
55 |
|
|
|
56 |
|
|
for (i = 0; i < filter_length;) { |
57 |
|
|
|
58 |
|
|
/* The reference G.729 and AMR fixed point code performs clipping after |
59 |
|
|
each of the two following accumulations. |
60 |
|
|
Since clipping affects only the synthetic OVERFLOW test without |
61 |
|
|
causing an int type overflow, it was moved outside the loop. */ |
62 |
|
|
|
63 |
|
|
/* R(x):=ac_v[-k+x] |
64 |
|
|
v += R(n-i)*ff_acelp_interp_filter(t+6i) |
65 |
|
|
v += R(n+i+1)*ff_acelp_interp_filter(6-t+6i) */ |
66 |
|
|
|
67 |
|
|
v += in[n + i] * filter_coeffs[idx + frac_pos]; |
68 |
|
|
idx += precision; |
69 |
|
|
i++; |
70 |
|
|
v += in[n - i] * filter_coeffs[idx - frac_pos]; |
71 |
|
|
} |
72 |
|
|
if (av_clip_int16(v >> 15) != (v >> 15)) |
73 |
|
|
av_log(NULL, AV_LOG_WARNING, "overflow that would need clipping in ff_acelp_interpolate()\n"); |
74 |
|
|
out[n] = v >> 15; |
75 |
|
|
} |
76 |
|
|
} |
77 |
|
|
|
78 |
|
79132 |
void ff_acelp_interpolatef(float *out, const float *in, |
79 |
|
|
const float *filter_coeffs, int precision, |
80 |
|
|
int frac_pos, int filter_length, int length) |
81 |
|
|
{ |
82 |
|
|
int n, i; |
83 |
|
|
|
84 |
✓✓ |
3629756 |
for (n = 0; n < length; n++) { |
85 |
|
3550624 |
int idx = 0; |
86 |
|
3550624 |
float v = 0; |
87 |
|
|
|
88 |
✓✓ |
48472544 |
for (i = 0; i < filter_length;) { |
89 |
|
44921920 |
v += in[n + i] * filter_coeffs[idx + frac_pos]; |
90 |
|
44921920 |
idx += precision; |
91 |
|
44921920 |
i++; |
92 |
|
44921920 |
v += in[n - i] * filter_coeffs[idx - frac_pos]; |
93 |
|
|
} |
94 |
|
3550624 |
out[n] = v; |
95 |
|
|
} |
96 |
|
79132 |
} |
97 |
|
|
|
98 |
|
|
|
99 |
|
|
void ff_acelp_high_pass_filter(int16_t* out, int hpf_f[2], |
100 |
|
|
const int16_t* in, int length) |
101 |
|
|
{ |
102 |
|
|
int i; |
103 |
|
|
int tmp; |
104 |
|
|
|
105 |
|
|
for (i = 0; i < length; i++) { |
106 |
|
|
tmp = (hpf_f[0]* 15836LL) >> 13; |
107 |
|
|
tmp += (hpf_f[1]* -7667LL) >> 13; |
108 |
|
|
tmp += 7699 * (in[i] - 2*in[i-1] + in[i-2]); |
109 |
|
|
|
110 |
|
|
/* With "+0x800" rounding, clipping is needed |
111 |
|
|
for ALGTHM and SPEECH tests. */ |
112 |
|
|
out[i] = av_clip_int16((tmp + 0x800) >> 12); |
113 |
|
|
|
114 |
|
|
hpf_f[1] = hpf_f[0]; |
115 |
|
|
hpf_f[0] = tmp; |
116 |
|
|
} |
117 |
|
|
} |
118 |
|
|
|
119 |
|
57598 |
void ff_acelp_apply_order_2_transfer_function(float *out, const float *in, |
120 |
|
|
const float zero_coeffs[2], |
121 |
|
|
const float pole_coeffs[2], |
122 |
|
|
float gain, float mem[2], int n) |
123 |
|
|
{ |
124 |
|
|
int i; |
125 |
|
|
float tmp; |
126 |
|
|
|
127 |
✓✓ |
4442654 |
for (i = 0; i < n; i++) { |
128 |
|
4385056 |
tmp = gain * in[i] - pole_coeffs[0] * mem[0] - pole_coeffs[1] * mem[1]; |
129 |
|
4385056 |
out[i] = tmp + zero_coeffs[0] * mem[0] + zero_coeffs[1] * mem[1]; |
130 |
|
|
|
131 |
|
4385056 |
mem[1] = mem[0]; |
132 |
|
4385056 |
mem[0] = tmp; |
133 |
|
|
} |
134 |
|
57598 |
} |
135 |
|
|
|
136 |
|
20085 |
void ff_tilt_compensation(float *mem, float tilt, float *samples, int size) |
137 |
|
|
{ |
138 |
|
20085 |
float new_tilt_mem = samples[size - 1]; |
139 |
|
|
int i; |
140 |
|
|
|
141 |
✓✓ |
759072 |
for (i = size - 1; i > 0; i--) |
142 |
|
738987 |
samples[i] -= tilt * samples[i - 1]; |
143 |
|
|
|
144 |
|
20085 |
samples[0] -= tilt * *mem; |
145 |
|
20085 |
*mem = new_tilt_mem; |
146 |
|
20085 |
} |
147 |
|
|
|
148 |
|
36 |
void ff_acelp_filter_init(ACELPFContext *c) |
149 |
|
|
{ |
150 |
|
36 |
c->acelp_interpolatef = ff_acelp_interpolatef; |
151 |
|
36 |
c->acelp_apply_order_2_transfer_function = ff_acelp_apply_order_2_transfer_function; |
152 |
|
|
|
153 |
|
|
if(HAVE_MIPSFPU) |
154 |
|
|
ff_acelp_filter_init_mips(c); |
155 |
|
36 |
} |