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/* $OpenBSD: dsp.c,v 1.9 2016/06/10 06:42:22 ratchov Exp $ */ |
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/* |
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* Copyright (c) 2008-2012 Alexandre Ratchov <alex@caoua.org> |
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* |
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* Permission to use, copy, modify, and distribute this software for any |
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* purpose with or without fee is hereby granted, provided that the above |
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* copyright notice and this permission notice appear in all copies. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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*/ |
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#include <string.h> |
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#include "dsp.h" |
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#include "utils.h" |
20 |
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21 |
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int aparams_ctltovol[128] = { |
22 |
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0, |
23 |
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256, 266, 276, 287, 299, 310, 323, 335, |
24 |
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348, 362, 376, 391, 406, 422, 439, 456, |
25 |
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474, 493, 512, 532, 553, 575, 597, 621, |
26 |
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645, 670, 697, 724, 753, 782, 813, 845, |
27 |
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878, 912, 948, 985, 1024, 1064, 1106, 1149, |
28 |
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1195, 1241, 1290, 1341, 1393, 1448, 1505, 1564, |
29 |
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1625, 1689, 1756, 1825, 1896, 1971, 2048, 2128, |
30 |
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2212, 2299, 2389, 2483, 2580, 2682, 2787, 2896, |
31 |
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3010, 3128, 3251, 3379, 3511, 3649, 3792, 3941, |
32 |
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4096, 4257, 4424, 4598, 4778, 4966, 5161, 5363, |
33 |
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5574, 5793, 6020, 6256, 6502, 6757, 7023, 7298, |
34 |
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7585, 7883, 8192, 8514, 8848, 9195, 9556, 9931, |
35 |
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10321, 10726, 11148, 11585, 12040, 12513, 13004, 13515, |
36 |
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14045, 14596, 15170, 15765, 16384, 17027, 17696, 18390, |
37 |
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19112, 19863, 20643, 21453, 22295, 23170, 24080, 25025, |
38 |
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26008, 27029, 28090, 29193, 30339, 31530, 32768 |
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}; |
40 |
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short dec_ulawmap[256] = { |
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-32124, -31100, -30076, -29052, -28028, -27004, -25980, -24956, |
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-23932, -22908, -21884, -20860, -19836, -18812, -17788, -16764, |
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-15996, -15484, -14972, -14460, -13948, -13436, -12924, -12412, |
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-11900, -11388, -10876, -10364, -9852, -9340, -8828, -8316, |
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-7932, -7676, -7420, -7164, -6908, -6652, -6396, -6140, |
47 |
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-5884, -5628, -5372, -5116, -4860, -4604, -4348, -4092, |
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-3900, -3772, -3644, -3516, -3388, -3260, -3132, -3004, |
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-2876, -2748, -2620, -2492, -2364, -2236, -2108, -1980, |
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-1884, -1820, -1756, -1692, -1628, -1564, -1500, -1436, |
51 |
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-1372, -1308, -1244, -1180, -1116, -1052, -988, -924, |
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-876, -844, -812, -780, -748, -716, -684, -652, |
53 |
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-620, -588, -556, -524, -492, -460, -428, -396, |
54 |
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-372, -356, -340, -324, -308, -292, -276, -260, |
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-244, -228, -212, -196, -180, -164, -148, -132, |
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-120, -112, -104, -96, -88, -80, -72, -64, |
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-56, -48, -40, -32, -24, -16, -8, 0, |
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32124, 31100, 30076, 29052, 28028, 27004, 25980, 24956, |
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23932, 22908, 21884, 20860, 19836, 18812, 17788, 16764, |
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15996, 15484, 14972, 14460, 13948, 13436, 12924, 12412, |
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11900, 11388, 10876, 10364, 9852, 9340, 8828, 8316, |
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7932, 7676, 7420, 7164, 6908, 6652, 6396, 6140, |
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5884, 5628, 5372, 5116, 4860, 4604, 4348, 4092, |
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3900, 3772, 3644, 3516, 3388, 3260, 3132, 3004, |
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2876, 2748, 2620, 2492, 2364, 2236, 2108, 1980, |
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1884, 1820, 1756, 1692, 1628, 1564, 1500, 1436, |
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1372, 1308, 1244, 1180, 1116, 1052, 988, 924, |
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876, 844, 812, 780, 748, 716, 684, 652, |
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620, 588, 556, 524, 492, 460, 428, 396, |
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372, 356, 340, 324, 308, 292, 276, 260, |
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244, 228, 212, 196, 180, 164, 148, 132, |
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120, 112, 104, 96, 88, 80, 72, 64, |
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56, 48, 40, 32, 24, 16, 8, 0 |
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}; |
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short dec_alawmap[256] = { |
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-5504, -5248, -6016, -5760, -4480, -4224, -4992, -4736, |
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-7552, -7296, -8064, -7808, -6528, -6272, -7040, -6784, |
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-2752, -2624, -3008, -2880, -2240, -2112, -2496, -2368, |
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-3776, -3648, -4032, -3904, -3264, -3136, -3520, -3392, |
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-22016, -20992, -24064, -23040, -17920, -16896, -19968, -18944, |
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-30208, -29184, -32256, -31232, -26112, -25088, -28160, -27136, |
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-11008, -10496, -12032, -11520, -8960, -8448, -9984, -9472, |
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-15104, -14592, -16128, -15616, -13056, -12544, -14080, -13568, |
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-344, -328, -376, -360, -280, -264, -312, -296, |
86 |
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-472, -456, -504, -488, -408, -392, -440, -424, |
87 |
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-88, -72, -120, -104, -24, -8, -56, -40, |
88 |
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-216, -200, -248, -232, -152, -136, -184, -168, |
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-1376, -1312, -1504, -1440, -1120, -1056, -1248, -1184, |
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-1888, -1824, -2016, -1952, -1632, -1568, -1760, -1696, |
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-688, -656, -752, -720, -560, -528, -624, -592, |
92 |
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-944, -912, -1008, -976, -816, -784, -880, -848, |
93 |
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5504, 5248, 6016, 5760, 4480, 4224, 4992, 4736, |
94 |
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7552, 7296, 8064, 7808, 6528, 6272, 7040, 6784, |
95 |
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2752, 2624, 3008, 2880, 2240, 2112, 2496, 2368, |
96 |
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3776, 3648, 4032, 3904, 3264, 3136, 3520, 3392, |
97 |
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22016, 20992, 24064, 23040, 17920, 16896, 19968, 18944, |
98 |
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30208, 29184, 32256, 31232, 26112, 25088, 28160, 27136, |
99 |
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11008, 10496, 12032, 11520, 8960, 8448, 9984, 9472, |
100 |
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15104, 14592, 16128, 15616, 13056, 12544, 14080, 13568, |
101 |
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344, 328, 376, 360, 280, 264, 312, 296, |
102 |
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472, 456, 504, 488, 408, 392, 440, 424, |
103 |
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88, 72, 120, 104, 24, 8, 56, 40, |
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216, 200, 248, 232, 152, 136, 184, 168, |
105 |
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1376, 1312, 1504, 1440, 1120, 1056, 1248, 1184, |
106 |
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1888, 1824, 2016, 1952, 1632, 1568, 1760, 1696, |
107 |
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688, 656, 752, 720, 560, 528, 624, 592, |
108 |
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944, 912, 1008, 976, 816, 784, 880, 848 |
109 |
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}; |
110 |
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111 |
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/* |
112 |
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* Generate a string corresponding to the encoding in par, |
113 |
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* return the length of the resulting string. |
114 |
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*/ |
115 |
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int |
116 |
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aparams_enctostr(struct aparams *par, char *ostr) |
117 |
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{ |
118 |
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char *p = ostr; |
119 |
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120 |
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*p++ = par->sig ? 's' : 'u'; |
121 |
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if (par->bits > 9) |
122 |
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*p++ = '0' + par->bits / 10; |
123 |
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*p++ = '0' + par->bits % 10; |
124 |
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if (par->bps > 1) { |
125 |
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*p++ = par->le ? 'l' : 'b'; |
126 |
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*p++ = 'e'; |
127 |
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if (par->bps != APARAMS_BPS(par->bits) || |
128 |
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par->bits < par->bps * 8) { |
129 |
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*p++ = par->bps + '0'; |
130 |
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if (par->bits < par->bps * 8) { |
131 |
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*p++ = par->msb ? 'm' : 'l'; |
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*p++ = 's'; |
133 |
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*p++ = 'b'; |
134 |
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} |
135 |
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} |
136 |
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} |
137 |
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*p++ = '\0'; |
138 |
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return p - ostr - 1; |
139 |
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} |
140 |
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141 |
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/* |
142 |
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* Parse an encoding string, examples: s8, u8, s16, s16le, s24be ... |
143 |
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* set *istr to the char following the encoding. Return the number |
144 |
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* of bytes consumed. |
145 |
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*/ |
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int |
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aparams_strtoenc(struct aparams *par, char *istr) |
148 |
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{ |
149 |
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char *p = istr; |
150 |
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int i, sig, bits, le, bps, msb; |
151 |
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152 |
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#define IS_SEP(c) \ |
153 |
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(((c) < 'a' || (c) > 'z') && \ |
154 |
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((c) < 'A' || (c) > 'Z') && \ |
155 |
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((c) < '0' || (c) > '9')) |
156 |
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157 |
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/* |
158 |
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* get signedness |
159 |
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*/ |
160 |
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if (*p == 's') { |
161 |
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sig = 1; |
162 |
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} else if (*p == 'u') { |
163 |
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sig = 0; |
164 |
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} else |
165 |
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return 0; |
166 |
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p++; |
167 |
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168 |
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/* |
169 |
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* get number of bits per sample |
170 |
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*/ |
171 |
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bits = 0; |
172 |
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for (i = 0; i < 2; i++) { |
173 |
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if (*p < '0' || *p > '9') |
174 |
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break; |
175 |
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bits = (bits * 10) + *p - '0'; |
176 |
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p++; |
177 |
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} |
178 |
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if (bits < BITS_MIN || bits > BITS_MAX) |
179 |
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return 0; |
180 |
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bps = APARAMS_BPS(bits); |
181 |
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msb = 1; |
182 |
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le = ADATA_LE; |
183 |
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184 |
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/* |
185 |
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* get (optional) endianness |
186 |
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*/ |
187 |
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if (p[0] == 'l' && p[1] == 'e') { |
188 |
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le = 1; |
189 |
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p += 2; |
190 |
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} else if (p[0] == 'b' && p[1] == 'e') { |
191 |
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le = 0; |
192 |
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p += 2; |
193 |
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} else if (IS_SEP(*p)) { |
194 |
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goto done; |
195 |
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} else |
196 |
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return 0; |
197 |
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198 |
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/* |
199 |
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* get (optional) number of bytes |
200 |
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*/ |
201 |
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if (*p >= '0' && *p <= '9') { |
202 |
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bps = *p - '0'; |
203 |
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if (bps < (bits + 7) / 8 || |
204 |
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bps > (BITS_MAX + 7) / 8) |
205 |
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return 0; |
206 |
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p++; |
207 |
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208 |
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/* |
209 |
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* get (optional) alignment |
210 |
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*/ |
211 |
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if (p[0] == 'm' && p[1] == 's' && p[2] == 'b') { |
212 |
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msb = 1; |
213 |
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p += 3; |
214 |
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} else if (p[0] == 'l' && p[1] == 's' && p[2] == 'b') { |
215 |
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msb = 0; |
216 |
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p += 3; |
217 |
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} else if (IS_SEP(*p)) { |
218 |
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goto done; |
219 |
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} else |
220 |
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return 0; |
221 |
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} else if (!IS_SEP(*p)) |
222 |
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return 0; |
223 |
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224 |
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done: |
225 |
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par->msb = msb; |
226 |
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par->sig = sig; |
227 |
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par->bits = bits; |
228 |
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par->bps = bps; |
229 |
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par->le = le; |
230 |
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return p - istr; |
231 |
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} |
232 |
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233 |
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/* |
234 |
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* Initialise parameters structure with the defaults natively supported |
235 |
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* by the machine. |
236 |
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*/ |
237 |
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void |
238 |
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aparams_init(struct aparams *par) |
239 |
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{ |
240 |
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par->bps = sizeof(adata_t); |
241 |
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par->bits = ADATA_BITS; |
242 |
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par->le = ADATA_LE; |
243 |
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par->sig = 1; |
244 |
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par->msb = 0; |
245 |
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} |
246 |
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247 |
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/* |
248 |
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* log the given format/channels/encoding |
249 |
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*/ |
250 |
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void |
251 |
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aparams_log(struct aparams *par) |
252 |
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{ |
253 |
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char enc[ENCMAX]; |
254 |
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255 |
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aparams_enctostr(par, enc); |
256 |
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log_puts(enc); |
257 |
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} |
258 |
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|
259 |
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/* |
260 |
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* return true if encoding corresponds to what we store in adata_t |
261 |
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*/ |
262 |
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int |
263 |
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aparams_native(struct aparams *par) |
264 |
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{ |
265 |
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return par->bps == sizeof(adata_t) && par->bits == ADATA_BITS && |
266 |
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(par->bps == 1 || par->le == ADATA_LE) && |
267 |
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(par->bits == par->bps * 8 || !par->msb); |
268 |
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} |
269 |
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|
270 |
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/* |
271 |
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* Return the number of input and output frame that would be consumed |
272 |
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* by resamp_do(p, *icnt, *ocnt). |
273 |
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*/ |
274 |
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void |
275 |
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resamp_getcnt(struct resamp *p, int *icnt, int *ocnt) |
276 |
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{ |
277 |
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long long idiff, odiff; |
278 |
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int cdiff; |
279 |
|
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|
280 |
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cdiff = p->oblksz - p->diff; |
281 |
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idiff = (long long)*icnt * p->oblksz; |
282 |
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odiff = (long long)*ocnt * p->iblksz; |
283 |
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if (odiff - idiff >= cdiff) |
284 |
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*ocnt = (idiff + cdiff + p->iblksz - 1) / p->iblksz; |
285 |
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else |
286 |
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*icnt = (odiff + p->diff) / p->oblksz; |
287 |
|
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} |
288 |
|
|
|
289 |
|
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/* |
290 |
|
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* Resample the given number of frames. The number of output frames |
291 |
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* must match the coresponding number the input frames. Either always |
292 |
|
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* use icnt and ocnt such that: |
293 |
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* |
294 |
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* icnt * oblksz = ocnt * iblksz |
295 |
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* |
296 |
|
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* or use resamp_getcnt() to calculate the proper numbers. |
297 |
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*/ |
298 |
|
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void |
299 |
|
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resamp_do(struct resamp *p, adata_t *in, adata_t *out, int icnt, int ocnt) |
300 |
|
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{ |
301 |
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unsigned int nch; |
302 |
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adata_t *idata; |
303 |
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unsigned int oblksz; |
304 |
|
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unsigned int ifr; |
305 |
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int s, ds, diff; |
306 |
|
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adata_t *odata; |
307 |
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unsigned int iblksz; |
308 |
|
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unsigned int ofr; |
309 |
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unsigned int c; |
310 |
|
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adata_t *ctxbuf, *ctx; |
311 |
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unsigned int ctx_start; |
312 |
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|
313 |
|
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/* |
314 |
|
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* Partially copy structures into local variables, to avoid |
315 |
|
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* unnecessary indirections; this also allows the compiler to |
316 |
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* order local variables more "cache-friendly". |
317 |
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*/ |
318 |
|
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idata = in; |
319 |
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odata = out; |
320 |
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diff = p->diff; |
321 |
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iblksz = p->iblksz; |
322 |
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oblksz = p->oblksz; |
323 |
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ctxbuf = p->ctx; |
324 |
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ctx_start = p->ctx_start; |
325 |
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nch = p->nch; |
326 |
|
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ifr = icnt; |
327 |
|
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ofr = ocnt; |
328 |
|
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|
329 |
|
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/* |
330 |
|
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* Start conversion. |
331 |
|
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*/ |
332 |
|
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#ifdef DEBUG |
333 |
|
|
if (log_level >= 4) { |
334 |
|
|
log_puts("resamp: copying "); |
335 |
|
|
log_puti(ifr); |
336 |
|
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log_puts(" -> "); |
337 |
|
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log_putu(ofr); |
338 |
|
|
log_puts(" frames, diff = "); |
339 |
|
|
log_puti(diff); |
340 |
|
|
log_puts("\n"); |
341 |
|
|
} |
342 |
|
|
#endif |
343 |
|
|
for (;;) { |
344 |
|
|
if (diff >= oblksz) { |
345 |
|
|
if (ifr == 0) |
346 |
|
|
break; |
347 |
|
|
ctx_start ^= 1; |
348 |
|
|
ctx = ctxbuf + ctx_start; |
349 |
|
|
for (c = nch; c > 0; c--) { |
350 |
|
|
*ctx = *idata++; |
351 |
|
|
ctx += RESAMP_NCTX; |
352 |
|
|
} |
353 |
|
|
diff -= oblksz; |
354 |
|
|
ifr--; |
355 |
|
|
} else { |
356 |
|
|
if (ofr == 0) |
357 |
|
|
break; |
358 |
|
|
ctx = ctxbuf; |
359 |
|
|
for (c = nch; c > 0; c--) { |
360 |
|
|
s = ctx[ctx_start ^ 1]; |
361 |
|
|
ds = ctx[ctx_start] - s; |
362 |
|
|
ctx += RESAMP_NCTX; |
363 |
|
|
*odata++ = s + ADATA_MULDIV(ds, diff, oblksz); |
364 |
|
|
} |
365 |
|
|
diff += iblksz; |
366 |
|
|
ofr--; |
367 |
|
|
} |
368 |
|
|
} |
369 |
|
|
p->diff = diff; |
370 |
|
|
p->ctx_start = ctx_start; |
371 |
|
|
#ifdef DEBUG |
372 |
|
|
if (ifr != 0) { |
373 |
|
|
log_puts("resamp_do: "); |
374 |
|
|
log_puti(ifr); |
375 |
|
|
log_puts(": too many input frames\n"); |
376 |
|
|
panic(); |
377 |
|
|
} |
378 |
|
|
if (ofr != 0) { |
379 |
|
|
log_puts("resamp_do: "); |
380 |
|
|
log_puti(ofr); |
381 |
|
|
log_puts(": too many output frames\n"); |
382 |
|
|
panic(); |
383 |
|
|
} |
384 |
|
|
#endif |
385 |
|
|
} |
386 |
|
|
|
387 |
|
|
static unsigned int |
388 |
|
|
uint_gcd(unsigned int a, unsigned int b) |
389 |
|
|
{ |
390 |
|
|
unsigned int r; |
391 |
|
|
|
392 |
|
|
while (b > 0) { |
393 |
|
|
r = a % b; |
394 |
|
|
a = b; |
395 |
|
|
b = r; |
396 |
|
|
} |
397 |
|
|
return a; |
398 |
|
|
} |
399 |
|
|
|
400 |
|
|
/* |
401 |
|
|
* initialize resampler with ibufsz/obufsz factor and "nch" channels |
402 |
|
|
*/ |
403 |
|
|
void |
404 |
|
|
resamp_init(struct resamp *p, unsigned int iblksz, |
405 |
|
|
unsigned int oblksz, int nch) |
406 |
|
|
{ |
407 |
|
|
unsigned int i, g; |
408 |
|
|
|
409 |
|
|
/* |
410 |
|
|
* reduice iblksz/oblksz fraction |
411 |
|
|
*/ |
412 |
|
|
g = uint_gcd(iblksz, oblksz); |
413 |
|
|
iblksz /= g; |
414 |
|
|
oblksz /= g; |
415 |
|
|
|
416 |
|
|
/* |
417 |
|
|
* ensure weired rates dont cause integer overflows |
418 |
|
|
*/ |
419 |
|
|
while (iblksz > ADATA_UNIT || oblksz > ADATA_UNIT) { |
420 |
|
|
iblksz >>= 1; |
421 |
|
|
oblksz >>= 1; |
422 |
|
|
} |
423 |
|
|
|
424 |
|
|
p->iblksz = iblksz; |
425 |
|
|
p->oblksz = oblksz; |
426 |
|
|
p->diff = 0; |
427 |
|
|
p->nch = nch; |
428 |
|
|
p->ctx_start = 0; |
429 |
|
|
for (i = 0; i < NCHAN_MAX * RESAMP_NCTX; i++) |
430 |
|
|
p->ctx[i] = 0; |
431 |
|
|
#ifdef DEBUG |
432 |
|
|
if (log_level >= 3) { |
433 |
|
|
log_puts("resamp: "); |
434 |
|
|
log_putu(iblksz); |
435 |
|
|
log_puts("/"); |
436 |
|
|
log_putu(oblksz); |
437 |
|
|
log_puts("\n"); |
438 |
|
|
} |
439 |
|
|
#endif |
440 |
|
|
} |
441 |
|
|
|
442 |
|
|
/* |
443 |
|
|
* encode "todo" frames from native to foreign encoding |
444 |
|
|
*/ |
445 |
|
|
void |
446 |
|
|
enc_do(struct conv *p, unsigned char *in, unsigned char *out, int todo) |
447 |
|
|
{ |
448 |
|
|
unsigned int f; |
449 |
|
|
adata_t *idata; |
450 |
|
|
unsigned int s; |
451 |
|
|
unsigned int oshift; |
452 |
|
|
unsigned int obias; |
453 |
|
|
unsigned int obps; |
454 |
|
|
unsigned int i; |
455 |
|
|
unsigned char *odata; |
456 |
|
|
int obnext; |
457 |
|
|
int osnext; |
458 |
|
|
|
459 |
|
|
#ifdef DEBUG |
460 |
|
|
if (log_level >= 4) { |
461 |
|
|
log_puts("enc: copying "); |
462 |
|
|
log_putu(todo); |
463 |
|
|
log_puts(" frames\n"); |
464 |
|
|
} |
465 |
|
|
#endif |
466 |
|
|
/* |
467 |
|
|
* Partially copy structures into local variables, to avoid |
468 |
|
|
* unnecessary indirections; this also allows the compiler to |
469 |
|
|
* order local variables more "cache-friendly". |
470 |
|
|
*/ |
471 |
|
|
idata = (adata_t *)in; |
472 |
|
|
odata = out; |
473 |
|
|
oshift = p->shift; |
474 |
|
|
obias = p->bias; |
475 |
|
|
obps = p->bps; |
476 |
|
|
obnext = p->bnext; |
477 |
|
|
osnext = p->snext; |
478 |
|
|
|
479 |
|
|
/* |
480 |
|
|
* Start conversion. |
481 |
|
|
*/ |
482 |
|
|
odata += p->bfirst; |
483 |
|
|
for (f = todo * p->nch; f > 0; f--) { |
484 |
|
|
/* convert adata to u32 */ |
485 |
|
|
s = (int)*idata++ + ADATA_UNIT; |
486 |
|
|
s <<= 32 - ADATA_BITS; |
487 |
|
|
/* convert u32 to uN */ |
488 |
|
|
s >>= oshift; |
489 |
|
|
/* convert uN to sN */ |
490 |
|
|
s -= obias; |
491 |
|
|
/* packetize sN */ |
492 |
|
|
for (i = obps; i > 0; i--) { |
493 |
|
|
*odata = (unsigned char)s; |
494 |
|
|
s >>= 8; |
495 |
|
|
odata += obnext; |
496 |
|
|
} |
497 |
|
|
odata += osnext; |
498 |
|
|
} |
499 |
|
|
} |
500 |
|
|
|
501 |
|
|
/* |
502 |
|
|
* store "todo" frames of silence in foreign encoding |
503 |
|
|
*/ |
504 |
|
|
void |
505 |
|
|
enc_sil_do(struct conv *p, unsigned char *out, int todo) |
506 |
|
|
{ |
507 |
|
|
unsigned int f; |
508 |
|
|
unsigned int s; |
509 |
|
|
unsigned int oshift; |
510 |
|
|
int obias; |
511 |
|
|
unsigned int obps; |
512 |
|
|
unsigned int i; |
513 |
|
|
unsigned char *odata; |
514 |
|
|
int obnext; |
515 |
|
|
int osnext; |
516 |
|
|
|
517 |
|
|
#ifdef DEBUG |
518 |
|
|
if (log_level >= 4) { |
519 |
|
|
log_puts("enc: silence "); |
520 |
|
|
log_putu(todo); |
521 |
|
|
log_puts(" frames\n"); |
522 |
|
|
} |
523 |
|
|
#endif |
524 |
|
|
/* |
525 |
|
|
* Partially copy structures into local variables, to avoid |
526 |
|
|
* unnecessary indirections; this also allows the compiler to |
527 |
|
|
* order local variables more "cache-friendly". |
528 |
|
|
*/ |
529 |
|
|
odata = out; |
530 |
|
|
oshift = p->shift; |
531 |
|
|
obias = p->bias; |
532 |
|
|
obps = p->bps; |
533 |
|
|
obnext = p->bnext; |
534 |
|
|
osnext = p->snext; |
535 |
|
|
|
536 |
|
|
/* |
537 |
|
|
* Start conversion. |
538 |
|
|
*/ |
539 |
|
|
odata += p->bfirst; |
540 |
|
|
for (f = todo * p->nch; f > 0; f--) { |
541 |
|
|
s = ((1U << 31) >> oshift) - obias; |
542 |
|
|
for (i = obps; i > 0; i--) { |
543 |
|
|
*odata = (unsigned char)s; |
544 |
|
|
s >>= 8; |
545 |
|
|
odata += obnext; |
546 |
|
|
} |
547 |
|
|
odata += osnext; |
548 |
|
|
} |
549 |
|
|
} |
550 |
|
|
|
551 |
|
|
/* |
552 |
|
|
* initialize encoder from native to foreign encoding |
553 |
|
|
*/ |
554 |
|
|
void |
555 |
|
|
enc_init(struct conv *p, struct aparams *par, int nch) |
556 |
|
|
{ |
557 |
|
|
p->nch = nch; |
558 |
|
|
p->bps = par->bps; |
559 |
|
|
if (par->msb) { |
560 |
|
|
p->shift = 32 - par->bps * 8; |
561 |
|
|
} else { |
562 |
|
|
p->shift = 32 - par->bits; |
563 |
|
|
} |
564 |
|
|
if (par->sig) { |
565 |
|
|
p->bias = (1U << 31) >> p->shift; |
566 |
|
|
} else { |
567 |
|
|
p->bias = 0; |
568 |
|
|
} |
569 |
|
|
if (!par->le) { |
570 |
|
|
p->bfirst = par->bps - 1; |
571 |
|
|
p->bnext = -1; |
572 |
|
|
p->snext = 2 * par->bps; |
573 |
|
|
} else { |
574 |
|
|
p->bfirst = 0; |
575 |
|
|
p->bnext = 1; |
576 |
|
|
p->snext = 0; |
577 |
|
|
} |
578 |
|
|
#ifdef DEBUG |
579 |
|
|
if (log_level >= 3) { |
580 |
|
|
log_puts("enc: "); |
581 |
|
|
aparams_log(par); |
582 |
|
|
log_puts(", "); |
583 |
|
|
log_puti(p->nch); |
584 |
|
|
log_puts(" channels\n"); |
585 |
|
|
} |
586 |
|
|
#endif |
587 |
|
|
} |
588 |
|
|
|
589 |
|
|
/* |
590 |
|
|
* decode "todo" frames from from foreign to native encoding |
591 |
|
|
*/ |
592 |
|
|
void |
593 |
|
|
dec_do(struct conv *p, unsigned char *in, unsigned char *out, int todo) |
594 |
|
|
{ |
595 |
|
|
unsigned int f; |
596 |
|
|
unsigned int ibps; |
597 |
|
|
unsigned int i; |
598 |
|
|
unsigned int s = 0xdeadbeef; |
599 |
|
|
unsigned char *idata; |
600 |
|
|
int ibnext; |
601 |
|
|
int isnext; |
602 |
|
|
unsigned int ibias; |
603 |
|
|
unsigned int ishift; |
604 |
|
|
adata_t *odata; |
605 |
|
|
|
606 |
|
|
#ifdef DEBUG |
607 |
|
|
if (log_level >= 4) { |
608 |
|
|
log_puts("dec: copying "); |
609 |
|
|
log_putu(todo); |
610 |
|
|
log_puts(" frames\n"); |
611 |
|
|
} |
612 |
|
|
#endif |
613 |
|
|
/* |
614 |
|
|
* Partially copy structures into local variables, to avoid |
615 |
|
|
* unnecessary indirections; this also allows the compiler to |
616 |
|
|
* order local variables more "cache-friendly". |
617 |
|
|
*/ |
618 |
|
|
idata = in; |
619 |
|
|
odata = (adata_t *)out; |
620 |
|
|
ibps = p->bps; |
621 |
|
|
ibnext = p->bnext; |
622 |
|
|
ibias = p->bias; |
623 |
|
|
ishift = p->shift; |
624 |
|
|
isnext = p->snext; |
625 |
|
|
|
626 |
|
|
/* |
627 |
|
|
* Start conversion. |
628 |
|
|
*/ |
629 |
|
|
idata += p->bfirst; |
630 |
|
|
for (f = todo * p->nch; f > 0; f--) { |
631 |
|
|
for (i = ibps; i > 0; i--) { |
632 |
|
|
s <<= 8; |
633 |
|
|
s |= *idata; |
634 |
|
|
idata += ibnext; |
635 |
|
|
} |
636 |
|
|
idata += isnext; |
637 |
|
|
s += ibias; |
638 |
|
|
s <<= ishift; |
639 |
|
|
s >>= 32 - ADATA_BITS; |
640 |
|
|
*odata++ = s - ADATA_UNIT; |
641 |
|
|
} |
642 |
|
|
} |
643 |
|
|
|
644 |
|
|
/* |
645 |
|
|
* convert a 32-bit float to adata_t, clipping to -1:1, boundaries |
646 |
|
|
* excluded |
647 |
|
|
*/ |
648 |
|
|
static inline int |
649 |
|
|
f32_to_adata(unsigned int x) |
650 |
|
|
{ |
651 |
|
|
unsigned int s, e, m, y; |
652 |
|
|
|
653 |
|
|
s = (x >> 31); |
654 |
|
|
e = (x >> 23) & 0xff; |
655 |
|
|
m = (x << 8) | 0x80000000; |
656 |
|
|
|
657 |
|
|
/* |
658 |
|
|
* f32 exponent is (e - 127) and the point is after the 31-th |
659 |
|
|
* bit, thus the shift is: |
660 |
|
|
* |
661 |
|
|
* 31 - (BITS - 1) - (e - 127) |
662 |
|
|
* |
663 |
|
|
* to ensure output is in the 0..(2^BITS)-1 range, the minimum |
664 |
|
|
* shift is 31 - (BITS - 1), and maximum shift is 31 |
665 |
|
|
*/ |
666 |
|
|
if (e < 127 - (ADATA_BITS - 1)) |
667 |
|
|
y = 0; |
668 |
|
|
else if (e > 127) |
669 |
|
|
y = ADATA_UNIT - 1; |
670 |
|
|
else |
671 |
|
|
y = m >> (127 + (32 - ADATA_BITS) - e); |
672 |
|
|
return (y ^ -s) + s; |
673 |
|
|
} |
674 |
|
|
|
675 |
|
|
/* |
676 |
|
|
* convert samples from little endian ieee 754 floats to adata_t |
677 |
|
|
*/ |
678 |
|
|
void |
679 |
|
|
dec_do_float(struct conv *p, unsigned char *in, unsigned char *out, int todo) |
680 |
|
|
{ |
681 |
|
|
unsigned int f; |
682 |
|
|
unsigned int i; |
683 |
|
|
unsigned int s = 0xdeadbeef; |
684 |
|
|
unsigned char *idata; |
685 |
|
|
int ibnext; |
686 |
|
|
int isnext; |
687 |
|
|
adata_t *odata; |
688 |
|
|
|
689 |
|
|
#ifdef DEBUG |
690 |
|
|
if (log_level >= 4) { |
691 |
|
|
log_puts("dec_float: copying "); |
692 |
|
|
log_putu(todo); |
693 |
|
|
log_puts(" frames\n"); |
694 |
|
|
} |
695 |
|
|
#endif |
696 |
|
|
/* |
697 |
|
|
* Partially copy structures into local variables, to avoid |
698 |
|
|
* unnecessary indirections; this also allows the compiler to |
699 |
|
|
* order local variables more "cache-friendly". |
700 |
|
|
*/ |
701 |
|
|
idata = in; |
702 |
|
|
odata = (adata_t *)out; |
703 |
|
|
ibnext = p->bnext; |
704 |
|
|
isnext = p->snext; |
705 |
|
|
|
706 |
|
|
/* |
707 |
|
|
* Start conversion. |
708 |
|
|
*/ |
709 |
|
|
idata += p->bfirst; |
710 |
|
|
for (f = todo * p->nch; f > 0; f--) { |
711 |
|
|
for (i = 4; i > 0; i--) { |
712 |
|
|
s <<= 8; |
713 |
|
|
s |= *idata; |
714 |
|
|
idata += ibnext; |
715 |
|
|
} |
716 |
|
|
idata += isnext; |
717 |
|
|
*odata++ = f32_to_adata(s); |
718 |
|
|
} |
719 |
|
|
} |
720 |
|
|
|
721 |
|
|
/* |
722 |
|
|
* convert samples from ulaw/alaw to adata_t |
723 |
|
|
*/ |
724 |
|
|
void |
725 |
|
|
dec_do_ulaw(struct conv *p, unsigned char *in, |
726 |
|
|
unsigned char *out, int todo, int is_alaw) |
727 |
|
|
{ |
728 |
|
|
unsigned int f; |
729 |
|
|
unsigned char *idata; |
730 |
|
|
adata_t *odata; |
731 |
|
|
short *map; |
732 |
|
|
|
733 |
|
|
#ifdef DEBUG |
734 |
|
|
if (log_level >= 4) { |
735 |
|
|
log_puts("dec_ulaw: copying "); |
736 |
|
|
log_putu(todo); |
737 |
|
|
log_puts(" frames\n"); |
738 |
|
|
} |
739 |
|
|
#endif |
740 |
|
|
map = is_alaw ? dec_alawmap : dec_ulawmap; |
741 |
|
|
idata = in; |
742 |
|
|
odata = (adata_t *)out; |
743 |
|
|
for (f = todo * p->nch; f > 0; f--) |
744 |
|
|
*odata++ = map[*idata++] << (ADATA_BITS - 16); |
745 |
|
|
} |
746 |
|
|
|
747 |
|
|
/* |
748 |
|
|
* initialize decoder from foreign to native encoding |
749 |
|
|
*/ |
750 |
|
|
void |
751 |
|
|
dec_init(struct conv *p, struct aparams *par, int nch) |
752 |
|
|
{ |
753 |
|
|
p->bps = par->bps; |
754 |
|
|
p->nch = nch; |
755 |
|
|
if (par->msb) { |
756 |
|
|
p->shift = 32 - par->bps * 8; |
757 |
|
|
} else { |
758 |
|
|
p->shift = 32 - par->bits; |
759 |
|
|
} |
760 |
|
|
if (par->sig) { |
761 |
|
|
p->bias = (1U << 31) >> p->shift; |
762 |
|
|
} else { |
763 |
|
|
p->bias = 0; |
764 |
|
|
} |
765 |
|
|
if (par->le) { |
766 |
|
|
p->bfirst = par->bps - 1; |
767 |
|
|
p->bnext = -1; |
768 |
|
|
p->snext = 2 * par->bps; |
769 |
|
|
} else { |
770 |
|
|
p->bfirst = 0; |
771 |
|
|
p->bnext = 1; |
772 |
|
|
p->snext = 0; |
773 |
|
|
} |
774 |
|
|
#ifdef DEBUG |
775 |
|
|
if (log_level >= 3) { |
776 |
|
|
log_puts("dec: "); |
777 |
|
|
aparams_log(par); |
778 |
|
|
log_puts(", "); |
779 |
|
|
log_puti(p->nch); |
780 |
|
|
log_puts(" channels\n"); |
781 |
|
|
} |
782 |
|
|
#endif |
783 |
|
|
} |
784 |
|
|
|
785 |
|
|
/* |
786 |
|
|
* mix "todo" input frames on the output with the given volume |
787 |
|
|
*/ |
788 |
|
|
void |
789 |
|
|
cmap_add(struct cmap *p, void *in, void *out, int vol, int todo) |
790 |
|
|
{ |
791 |
|
|
adata_t *idata, *odata; |
792 |
|
|
int i, j, nch, istart, inext, onext, ostart, y, v; |
793 |
|
|
|
794 |
|
|
#ifdef DEBUG |
795 |
|
|
if (log_level >= 4) { |
796 |
|
|
log_puts("cmap: adding "); |
797 |
|
|
log_puti(todo); |
798 |
|
|
log_puts(" frames\n"); |
799 |
|
|
} |
800 |
|
|
#endif |
801 |
|
|
idata = in; |
802 |
|
|
odata = out; |
803 |
|
|
ostart = p->ostart; |
804 |
|
|
onext = p->onext; |
805 |
|
|
istart = p->istart; |
806 |
|
|
inext = p->inext; |
807 |
|
|
nch = p->nch; |
808 |
|
|
v = vol; |
809 |
|
|
|
810 |
|
|
/* |
811 |
|
|
* map/mix input on the output |
812 |
|
|
*/ |
813 |
|
|
for (i = todo; i > 0; i--) { |
814 |
|
|
odata += ostart; |
815 |
|
|
idata += istart; |
816 |
|
|
for (j = nch; j > 0; j--) { |
817 |
|
|
y = *odata + ADATA_MUL(*idata, v); |
818 |
|
|
if (y >= ADATA_UNIT) |
819 |
|
|
y = ADATA_UNIT - 1; |
820 |
|
|
else if (y < -ADATA_UNIT) |
821 |
|
|
y = -ADATA_UNIT; |
822 |
|
|
*odata = y; |
823 |
|
|
idata++; |
824 |
|
|
odata++; |
825 |
|
|
} |
826 |
|
|
odata += onext; |
827 |
|
|
idata += inext; |
828 |
|
|
} |
829 |
|
|
} |
830 |
|
|
|
831 |
|
|
/* |
832 |
|
|
* overwrite output with "todo" input frames with with the given volume |
833 |
|
|
*/ |
834 |
|
|
void |
835 |
|
|
cmap_copy(struct cmap *p, void *in, void *out, int vol, int todo) |
836 |
|
|
{ |
837 |
|
|
adata_t *idata, *odata; |
838 |
|
|
int i, j, nch, istart, inext, onext, ostart, v; |
839 |
|
|
|
840 |
|
|
#ifdef DEBUG |
841 |
|
|
if (log_level >= 4) { |
842 |
|
|
log_puts("cmap: copying "); |
843 |
|
|
log_puti(todo); |
844 |
|
|
log_puts(" frames\n"); |
845 |
|
|
} |
846 |
|
|
#endif |
847 |
|
|
idata = in; |
848 |
|
|
odata = out; |
849 |
|
|
ostart = p->ostart; |
850 |
|
|
onext = p->onext; |
851 |
|
|
istart = p->istart; |
852 |
|
|
inext = p->inext; |
853 |
|
|
nch = p->nch; |
854 |
|
|
v = vol; |
855 |
|
|
|
856 |
|
|
/* |
857 |
|
|
* copy to the output buffer |
858 |
|
|
*/ |
859 |
|
|
for (i = todo; i > 0; i--) { |
860 |
|
|
idata += istart; |
861 |
|
|
odata += ostart; |
862 |
|
|
for (j = nch; j > 0; j--) { |
863 |
|
|
*odata = ADATA_MUL(*idata, v); |
864 |
|
|
odata++; |
865 |
|
|
idata++; |
866 |
|
|
} |
867 |
|
|
odata += onext; |
868 |
|
|
idata += inext; |
869 |
|
|
} |
870 |
|
|
} |
871 |
|
|
|
872 |
|
|
/* |
873 |
|
|
* initialize channel mapper, to map a subset of input channel range |
874 |
|
|
* into a subset of the output channel range |
875 |
|
|
*/ |
876 |
|
|
void |
877 |
|
|
cmap_init(struct cmap *p, |
878 |
|
|
int imin, int imax, int isubmin, int isubmax, |
879 |
|
|
int omin, int omax, int osubmin, int osubmax) |
880 |
|
|
{ |
881 |
|
|
int cmin, cmax; |
882 |
|
|
|
883 |
|
|
cmin = -NCHAN_MAX; |
884 |
|
|
if (osubmin > cmin) |
885 |
|
|
cmin = osubmin; |
886 |
|
|
if (omin > cmin) |
887 |
|
|
cmin = omin; |
888 |
|
|
if (isubmin > cmin) |
889 |
|
|
cmin = isubmin; |
890 |
|
|
if (imin > cmin) |
891 |
|
|
cmin = imin; |
892 |
|
|
|
893 |
|
|
cmax = NCHAN_MAX; |
894 |
|
|
if (osubmax < cmax) |
895 |
|
|
cmax = osubmax; |
896 |
|
|
if (omax < cmax) |
897 |
|
|
cmax = omax; |
898 |
|
|
if (isubmax < cmax) |
899 |
|
|
cmax = isubmax; |
900 |
|
|
if (imax < cmax) |
901 |
|
|
cmax = imax; |
902 |
|
|
|
903 |
|
|
p->ostart = cmin - omin; |
904 |
|
|
p->onext = omax - cmax; |
905 |
|
|
p->istart = cmin - imin; |
906 |
|
|
p->inext = imax - cmax; |
907 |
|
|
p->nch = cmax - cmin + 1; |
908 |
|
|
#ifdef DEBUG |
909 |
|
|
if (log_level >= 3) { |
910 |
|
|
log_puts("cmap: nch = "); |
911 |
|
|
log_puti(p->nch); |
912 |
|
|
log_puts(", ostart = "); |
913 |
|
|
log_puti(p->ostart); |
914 |
|
|
log_puts(", onext = "); |
915 |
|
|
log_puti(p->onext); |
916 |
|
|
log_puts(", istart = "); |
917 |
|
|
log_puti(p->istart); |
918 |
|
|
log_puts(", inext = "); |
919 |
|
|
log_puti(p->inext); |
920 |
|
|
log_puts("\n"); |
921 |
|
|
} |
922 |
|
|
#endif |
923 |
|
|
} |