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1 | /* |
2 | * audio resampling | |
3 | * Copyright (c) 2004-2012 Michael Niedermayer <michaelni@gmx.at> | |
4 | * | |
5 | * This file is part of FFmpeg. | |
6 | * | |
7 | * FFmpeg is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU Lesser General Public | |
9 | * License as published by the Free Software Foundation; either | |
10 | * version 2.1 of the License, or (at your option) any later version. | |
11 | * | |
12 | * FFmpeg is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * Lesser General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU Lesser General Public | |
18 | * License along with FFmpeg; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
20 | */ | |
21 | ||
22 | /** | |
23 | * @file | |
24 | * audio resampling | |
25 | * @author Michael Niedermayer <michaelni@gmx.at> | |
26 | */ | |
27 | ||
28 | #if defined(TEMPLATE_RESAMPLE_DBL) | |
29 | ||
30 | # define RENAME(N) N ## _double | |
31 | # define FILTER_SHIFT 0 | |
32 | # define DELEM double | |
33 | # define FELEM double | |
34 | # define FELEM2 double | |
35 | # define OUT(d, v) d = v | |
36 | ||
37 | #elif defined(TEMPLATE_RESAMPLE_FLT) | |
38 | ||
39 | # define RENAME(N) N ## _float | |
40 | # define FILTER_SHIFT 0 | |
41 | # define DELEM float | |
42 | # define FELEM float | |
43 | # define FELEM2 float | |
44 | # define OUT(d, v) d = v | |
45 | ||
46 | #elif defined(TEMPLATE_RESAMPLE_S32) | |
47 | ||
48 | # define RENAME(N) N ## _int32 | |
49 | # define FILTER_SHIFT 30 | |
50 | # define DELEM int32_t | |
51 | # define FELEM int32_t | |
52 | # define FELEM2 int64_t | |
53 | # define FELEM_MAX INT32_MAX | |
54 | # define FELEM_MIN INT32_MIN | |
55 | # define OUT(d, v) v = (v + (1<<(FILTER_SHIFT-1)))>>FILTER_SHIFT;\ | |
56 | d = (uint64_t)(v + 0x80000000) > 0xFFFFFFFF ? (v>>63) ^ 0x7FFFFFFF : v | |
57 | ||
58 | #elif defined(TEMPLATE_RESAMPLE_S16) | |
59 | ||
60 | # define RENAME(N) N ## _int16 | |
61 | # define FILTER_SHIFT 15 | |
62 | # define DELEM int16_t | |
63 | # define FELEM int16_t | |
64 | # define FELEM2 int32_t | |
65 | # define FELEML int64_t | |
66 | # define FELEM_MAX INT16_MAX | |
67 | # define FELEM_MIN INT16_MIN | |
68 | # define OUT(d, v) v = (v + (1<<(FILTER_SHIFT-1)))>>FILTER_SHIFT;\ | |
69 | d = (unsigned)(v + 32768) > 65535 ? (v>>31) ^ 32767 : v | |
70 | ||
71 | #endif | |
72 | ||
73 | static void RENAME(resample_one)(void *dest, const void *source, | |
74 | int dst_size, int64_t index2, int64_t incr) | |
75 | { | |
76 | DELEM *dst = dest; | |
77 | const DELEM *src = source; | |
78 | int dst_index; | |
79 | ||
80 | for (dst_index = 0; dst_index < dst_size; dst_index++) { | |
81 | dst[dst_index] = src[index2 >> 32]; | |
82 | index2 += incr; | |
83 | } | |
84 | } | |
85 | ||
86 | static int RENAME(resample_common)(ResampleContext *c, | |
87 | void *dest, const void *source, | |
88 | int n, int update_ctx) | |
89 | { | |
90 | DELEM *dst = dest; | |
91 | const DELEM *src = source; | |
92 | int dst_index; | |
93 | int index= c->index; | |
94 | int frac= c->frac; | |
95 | int sample_index = index >> c->phase_shift; | |
96 | ||
97 | index &= c->phase_mask; | |
98 | for (dst_index = 0; dst_index < n; dst_index++) { | |
99 | FELEM *filter = ((FELEM *) c->filter_bank) + c->filter_alloc * index; | |
100 | ||
101 | FELEM2 val=0; | |
102 | int i; | |
103 | for (i = 0; i < c->filter_length; i++) { | |
104 | val += src[sample_index + i] * (FELEM2)filter[i]; | |
105 | } | |
106 | OUT(dst[dst_index], val); | |
107 | ||
108 | frac += c->dst_incr_mod; | |
109 | index += c->dst_incr_div; | |
110 | if (frac >= c->src_incr) { | |
111 | frac -= c->src_incr; | |
112 | index++; | |
113 | } | |
114 | sample_index += index >> c->phase_shift; | |
115 | index &= c->phase_mask; | |
116 | } | |
117 | ||
118 | if(update_ctx){ | |
119 | c->frac= frac; | |
120 | c->index= index; | |
121 | } | |
122 | ||
123 | return sample_index; | |
124 | } | |
125 | ||
126 | static int RENAME(resample_linear)(ResampleContext *c, | |
127 | void *dest, const void *source, | |
128 | int n, int update_ctx) | |
129 | { | |
130 | DELEM *dst = dest; | |
131 | const DELEM *src = source; | |
132 | int dst_index; | |
133 | int index= c->index; | |
134 | int frac= c->frac; | |
135 | int sample_index = index >> c->phase_shift; | |
136 | #if FILTER_SHIFT == 0 | |
137 | double inv_src_incr = 1.0 / c->src_incr; | |
138 | #endif | |
139 | ||
140 | index &= c->phase_mask; | |
141 | for (dst_index = 0; dst_index < n; dst_index++) { | |
142 | FELEM *filter = ((FELEM *) c->filter_bank) + c->filter_alloc * index; | |
143 | FELEM2 val=0, v2 = 0; | |
144 | ||
145 | int i; | |
146 | for (i = 0; i < c->filter_length; i++) { | |
147 | val += src[sample_index + i] * (FELEM2)filter[i]; | |
148 | v2 += src[sample_index + i] * (FELEM2)filter[i + c->filter_alloc]; | |
149 | } | |
150 | #ifdef FELEML | |
151 | val += (v2 - val) * (FELEML) frac / c->src_incr; | |
152 | #else | |
153 | # if FILTER_SHIFT == 0 | |
154 | val += (v2 - val) * inv_src_incr * frac; | |
155 | # else | |
156 | val += (v2 - val) / c->src_incr * frac; | |
157 | # endif | |
158 | #endif | |
159 | OUT(dst[dst_index], val); | |
160 | ||
161 | frac += c->dst_incr_mod; | |
162 | index += c->dst_incr_div; | |
163 | if (frac >= c->src_incr) { | |
164 | frac -= c->src_incr; | |
165 | index++; | |
166 | } | |
167 | sample_index += index >> c->phase_shift; | |
168 | index &= c->phase_mask; | |
169 | } | |
170 | ||
171 | if(update_ctx){ | |
172 | c->frac= frac; | |
173 | c->index= index; | |
174 | } | |
175 | ||
176 | return sample_index; | |
177 | } | |
178 | ||
179 | #undef RENAME | |
180 | #undef FILTER_SHIFT | |
181 | #undef DELEM | |
182 | #undef FELEM | |
183 | #undef FELEM2 | |
184 | #undef FELEML | |
185 | #undef FELEM_MAX | |
186 | #undef FELEM_MIN | |
187 | #undef OUT |