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1 /* libst.h - include file for portable sound tools library
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2 **
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3 ** Copyright (C) 1989 by Jef Poskanzer.
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4 **
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5 ** Permission to use, copy, modify, and distribute this software and its
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6 ** documentation for any purpose and without fee is hereby granted, provided
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7 ** that the above copyright notice appear in all copies and that both that
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8 ** copyright notice and this permission notice appear in supporting
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9 ** documentation. This software is provided "as is" without express or
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10 ** implied warranty.
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11 */
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12
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13 /* Synched up with: Not in FSF. */
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14
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398
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15 #ifndef INCLUDED_libst_h_
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16 #define INCLUDED_libst_h_
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17
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0
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18 #define SAMPLES_PER_SECOND 8192
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19
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20 #define MINLIN -32768
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21 #define MAXLIN 32767
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22 #define LINCLIP(x) do { if ( x < MINLIN ) x = MINLIN ; else if ( x > MAXLIN ) x = MAXLIN; } while ( 0 )
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23
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24 unsigned char st_linear_to_ulaw( /* int sample */ );
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25 int st_ulaw_to_linear_slow( /* unsigned char ulawbyte */ );
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26
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27 /*
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28 ** This macro converts from ulaw to 16 bit linear, faster.
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29 **
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30 ** Jef Poskanzer
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31 ** 23 October 1989
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32 **
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33 ** Input: 8 bit ulaw sample
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34 ** Output: signed 16 bit linear sample
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35 */
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36 #define st_ulaw_to_linear(ulawbyte) ulaw_table[ulawbyte]
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37
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38 static int ulaw_table[256] = {
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39 -32124, -31100, -30076, -29052, -28028, -27004, -25980, -24956,
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40 -23932, -22908, -21884, -20860, -19836, -18812, -17788, -16764,
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41 -15996, -15484, -14972, -14460, -13948, -13436, -12924, -12412,
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42 -11900, -11388, -10876, -10364, -9852, -9340, -8828, -8316,
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43 -7932, -7676, -7420, -7164, -6908, -6652, -6396, -6140,
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44 -5884, -5628, -5372, -5116, -4860, -4604, -4348, -4092,
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45 -3900, -3772, -3644, -3516, -3388, -3260, -3132, -3004,
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46 -2876, -2748, -2620, -2492, -2364, -2236, -2108, -1980,
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47 -1884, -1820, -1756, -1692, -1628, -1564, -1500, -1436,
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48 -1372, -1308, -1244, -1180, -1116, -1052, -988, -924,
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49 -876, -844, -812, -780, -748, -716, -684, -652,
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50 -620, -588, -556, -524, -492, -460, -428, -396,
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51 -372, -356, -340, -324, -308, -292, -276, -260,
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52 -244, -228, -212, -196, -180, -164, -148, -132,
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53 -120, -112, -104, -96, -88, -80, -72, -64,
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54 -56, -48, -40, -32, -24, -16, -8, 0,
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55 32124, 31100, 30076, 29052, 28028, 27004, 25980, 24956,
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56 23932, 22908, 21884, 20860, 19836, 18812, 17788, 16764,
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57 15996, 15484, 14972, 14460, 13948, 13436, 12924, 12412,
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58 11900, 11388, 10876, 10364, 9852, 9340, 8828, 8316,
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59 7932, 7676, 7420, 7164, 6908, 6652, 6396, 6140,
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60 5884, 5628, 5372, 5116, 4860, 4604, 4348, 4092,
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61 3900, 3772, 3644, 3516, 3388, 3260, 3132, 3004,
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62 2876, 2748, 2620, 2492, 2364, 2236, 2108, 1980,
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63 1884, 1820, 1756, 1692, 1628, 1564, 1500, 1436,
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64 1372, 1308, 1244, 1180, 1116, 1052, 988, 924,
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65 876, 844, 812, 780, 748, 716, 684, 652,
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66 620, 588, 556, 524, 492, 460, 428, 396,
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67 372, 356, 340, 324, 308, 292, 276, 260,
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68 244, 228, 212, 196, 180, 164, 148, 132,
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69 120, 112, 104, 96, 88, 80, 72, 64,
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70 56, 48, 40, 32, 24, 16, 8, 0 };
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398
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71
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72 #endif /* INCLUDED_libst_h_ */
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