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Diffstat (limited to 'apps/codecs/libatrac/mdct.c')
-rw-r--r-- | apps/codecs/libatrac/mdct.c | 245 |
1 files changed, 0 insertions, 245 deletions
diff --git a/apps/codecs/libatrac/mdct.c b/apps/codecs/libatrac/mdct.c deleted file mode 100644 index 670b6d381e..0000000000 --- a/apps/codecs/libatrac/mdct.c +++ /dev/null | |||
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1 | /* | ||
2 | * MDCT/IMDCT transforms | ||
3 | * Copyright (c) 2002 Fabrice Bellard | ||
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 | #include "dsputil.h" | ||
22 | |||
23 | #ifndef M_E | ||
24 | #define M_E 2.7182818284590452354 /* e */ | ||
25 | #endif | ||
26 | #ifndef M_LN2 | ||
27 | #define M_LN2 0.69314718055994530942 /* log_e 2 */ | ||
28 | #endif | ||
29 | #ifndef M_LN10 | ||
30 | #define M_LN10 2.30258509299404568402 /* log_e 10 */ | ||
31 | #endif | ||
32 | #ifndef M_PI | ||
33 | #define M_PI 3.14159265358979323846 /* pi */ | ||
34 | #endif | ||
35 | #ifndef M_SQRT1_2 | ||
36 | #define M_SQRT1_2 0.70710678118654752440 /* 1/sqrt(2) */ | ||
37 | #endif | ||
38 | |||
39 | /** | ||
40 | * @file libavcodec/mdct.c | ||
41 | * MDCT/IMDCT transforms. | ||
42 | */ | ||
43 | |||
44 | // Generate a Kaiser-Bessel Derived Window. | ||
45 | #define BESSEL_I0_ITER 50 // default: 50 iterations of Bessel I0 approximation | ||
46 | av_cold void ff_kbd_window_init(float *window, float alpha, int n) | ||
47 | { | ||
48 | int i, j; | ||
49 | double sum = 0.0, bessel, tmp; | ||
50 | double local_window[n]; | ||
51 | double alpha2 = (alpha * M_PI / n) * (alpha * M_PI / n); | ||
52 | |||
53 | for (i = 0; i < n; i++) { | ||
54 | tmp = i * (n - i) * alpha2; | ||
55 | bessel = 1.0; | ||
56 | for (j = BESSEL_I0_ITER; j > 0; j--) | ||
57 | bessel = bessel * tmp / (j * j) + 1; | ||
58 | sum += bessel; | ||
59 | local_window[i] = sum; | ||
60 | } | ||
61 | |||
62 | sum++; | ||
63 | for (i = 0; i < n; i++) | ||
64 | window[i] = sqrt(local_window[i] / sum); | ||
65 | } | ||
66 | |||
67 | DECLARE_ALIGNED(16, float, ff_sine_128 [ 128]); | ||
68 | DECLARE_ALIGNED(16, float, ff_sine_256 [ 256]); | ||
69 | DECLARE_ALIGNED(16, float, ff_sine_512 [ 512]); | ||
70 | DECLARE_ALIGNED(16, float, ff_sine_1024[1024]); | ||
71 | DECLARE_ALIGNED(16, float, ff_sine_2048[2048]); | ||
72 | DECLARE_ALIGNED(16, float, ff_sine_4096[4096]); | ||
73 | float *ff_sine_windows[6] = { | ||
74 | ff_sine_128, ff_sine_256, ff_sine_512, ff_sine_1024, ff_sine_2048, ff_sine_4096 | ||
75 | }; | ||
76 | |||
77 | // Generate a sine window. | ||
78 | av_cold void ff_sine_window_init(float *window, int n) { | ||
79 | int i; | ||
80 | for(i = 0; i < n; i++) | ||
81 | window[i] = sinf((i + 0.5) * (M_PI / (2.0 * n))); | ||
82 | } | ||
83 | |||
84 | /** | ||
85 | * init MDCT or IMDCT computation. | ||
86 | */ | ||
87 | av_cold int ff_mdct_init(MDCTContext *s, int nbits, int inverse) | ||
88 | { | ||
89 | int n, n4, i; | ||
90 | double alpha; | ||
91 | |||
92 | memset(s, 0, sizeof(*s)); | ||
93 | n = 1 << nbits; | ||
94 | s->nbits = nbits; | ||
95 | s->n = n; | ||
96 | n4 = n >> 2; | ||
97 | s->tcos = av_malloc(n4 * sizeof(FFTSample)); | ||
98 | if (!s->tcos) | ||
99 | goto fail; | ||
100 | s->tsin = av_malloc(n4 * sizeof(FFTSample)); | ||
101 | if (!s->tsin) | ||
102 | goto fail; | ||
103 | |||
104 | for(i=0;i<n4;i++) { | ||
105 | alpha = 2 * M_PI * (i + 1.0 / 8.0) / n; | ||
106 | s->tcos[i] = -cos(alpha); | ||
107 | s->tsin[i] = -sin(alpha); | ||
108 | } | ||
109 | if (ff_fft_init(&s->fft, s->nbits - 2, inverse) < 0) | ||
110 | goto fail; | ||
111 | return 0; | ||
112 | fail: | ||
113 | av_freep(&s->tcos); | ||
114 | av_freep(&s->tsin); | ||
115 | return -1; | ||
116 | } | ||
117 | |||
118 | /* complex multiplication: p = a * b */ | ||
119 | #define CMUL(pre, pim, are, aim, bre, bim) \ | ||
120 | {\ | ||
121 | FFTSample _are = (are);\ | ||
122 | FFTSample _aim = (aim);\ | ||
123 | FFTSample _bre = (bre);\ | ||
124 | FFTSample _bim = (bim);\ | ||
125 | (pre) = _are * _bre - _aim * _bim;\ | ||
126 | (pim) = _are * _bim + _aim * _bre;\ | ||
127 | } | ||
128 | |||
129 | /** | ||
130 | * Compute the middle half of the inverse MDCT of size N = 2^nbits, | ||
131 | * thus excluding the parts that can be derived by symmetry | ||
132 | * @param output N/2 samples | ||
133 | * @param input N/2 samples | ||
134 | */ | ||
135 | void ff_imdct_half_c(MDCTContext *s, FFTSample *output, const FFTSample *input) | ||
136 | { | ||
137 | int k, n8, n4, n2, n, j; | ||
138 | const uint16_t *revtab = s->fft.revtab; | ||
139 | const FFTSample *tcos = s->tcos; | ||
140 | const FFTSample *tsin = s->tsin; | ||
141 | const FFTSample *in1, *in2; | ||
142 | FFTComplex *z = (FFTComplex *)output; | ||
143 | |||
144 | n = 1 << s->nbits; | ||
145 | n2 = n >> 1; | ||
146 | n4 = n >> 2; | ||
147 | n8 = n >> 3; | ||
148 | |||
149 | /* pre rotation */ | ||
150 | in1 = input; | ||
151 | in2 = input + n2 - 1; | ||
152 | for(k = 0; k < n4; k++) { | ||
153 | j=revtab[k]; | ||
154 | CMUL(z[j].re, z[j].im, *in2, *in1, tcos[k], tsin[k]); | ||
155 | in1 += 2; | ||
156 | in2 -= 2; | ||
157 | } | ||
158 | ff_fft_calc(&s->fft, z); | ||
159 | |||
160 | /* post rotation + reordering */ | ||
161 | output += n4; | ||
162 | for(k = 0; k < n8; k++) { | ||
163 | FFTSample r0, i0, r1, i1; | ||
164 | CMUL(r0, i1, z[n8-k-1].im, z[n8-k-1].re, tsin[n8-k-1], tcos[n8-k-1]); | ||
165 | CMUL(r1, i0, z[n8+k ].im, z[n8+k ].re, tsin[n8+k ], tcos[n8+k ]); | ||
166 | z[n8-k-1].re = r0; | ||
167 | z[n8-k-1].im = i0; | ||
168 | z[n8+k ].re = r1; | ||
169 | z[n8+k ].im = i1; | ||
170 | } | ||
171 | } | ||
172 | |||
173 | /** | ||
174 | * Compute inverse MDCT of size N = 2^nbits | ||
175 | * @param output N samples | ||
176 | * @param input N/2 samples | ||
177 | */ | ||
178 | void ff_imdct_calc_c(MDCTContext *s, FFTSample *output, const FFTSample *input) | ||
179 | { | ||
180 | int k; | ||
181 | int n = 1 << s->nbits; | ||
182 | int n2 = n >> 1; | ||
183 | int n4 = n >> 2; | ||
184 | |||
185 | ff_imdct_half_c(s, output+n4, input); | ||
186 | |||
187 | for(k = 0; k < n4; k++) { | ||
188 | output[k] = -output[n2-k-1]; | ||
189 | output[n-k-1] = output[n2+k]; | ||
190 | } | ||
191 | } | ||
192 | |||
193 | /** | ||
194 | * Compute MDCT of size N = 2^nbits | ||
195 | * @param input N samples | ||
196 | * @param out N/2 samples | ||
197 | */ | ||
198 | void ff_mdct_calc(MDCTContext *s, FFTSample *out, const FFTSample *input) | ||
199 | { | ||
200 | int i, j, n, n8, n4, n2, n3; | ||
201 | FFTSample re, im; | ||
202 | const uint16_t *revtab = s->fft.revtab; | ||
203 | const FFTSample *tcos = s->tcos; | ||
204 | const FFTSample *tsin = s->tsin; | ||
205 | FFTComplex *x = (FFTComplex *)out; | ||
206 | |||
207 | n = 1 << s->nbits; | ||
208 | n2 = n >> 1; | ||
209 | n4 = n >> 2; | ||
210 | n8 = n >> 3; | ||
211 | n3 = 3 * n4; | ||
212 | |||
213 | /* pre rotation */ | ||
214 | for(i=0;i<n8;i++) { | ||
215 | re = -input[2*i+3*n4] - input[n3-1-2*i]; | ||
216 | im = -input[n4+2*i] + input[n4-1-2*i]; | ||
217 | j = revtab[i]; | ||
218 | CMUL(x[j].re, x[j].im, re, im, -tcos[i], tsin[i]); | ||
219 | |||
220 | re = input[2*i] - input[n2-1-2*i]; | ||
221 | im = -(input[n2+2*i] + input[n-1-2*i]); | ||
222 | j = revtab[n8 + i]; | ||
223 | CMUL(x[j].re, x[j].im, re, im, -tcos[n8 + i], tsin[n8 + i]); | ||
224 | } | ||
225 | |||
226 | ff_fft_calc(&s->fft, x); | ||
227 | |||
228 | /* post rotation */ | ||
229 | for(i=0;i<n8;i++) { | ||
230 | FFTSample r0, i0, r1, i1; | ||
231 | CMUL(i1, r0, x[n8-i-1].re, x[n8-i-1].im, -tsin[n8-i-1], -tcos[n8-i-1]); | ||
232 | CMUL(i0, r1, x[n8+i ].re, x[n8+i ].im, -tsin[n8+i ], -tcos[n8+i ]); | ||
233 | x[n8-i-1].re = r0; | ||
234 | x[n8-i-1].im = i0; | ||
235 | x[n8+i ].re = r1; | ||
236 | x[n8+i ].im = i1; | ||
237 | } | ||
238 | } | ||
239 | |||
240 | av_cold void ff_mdct_end(MDCTContext *s) | ||
241 | { | ||
242 | av_freep(&s->tcos); | ||
243 | av_freep(&s->tsin); | ||
244 | ff_fft_end(&s->fft); | ||
245 | } | ||