Mercurial > hg > audiostuff
comparison spandsp-0.0.6pre17/src/lpc10_encdecs.h @ 4:26cd8f1ef0b1
import spandsp-0.0.6pre17
| author | Peter Meerwald <pmeerw@cosy.sbg.ac.at> |
|---|---|
| date | Fri, 25 Jun 2010 15:50:58 +0200 |
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| 3:c6c5a16ce2f2 | 4:26cd8f1ef0b1 |
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| 1 /* | |
| 2 * SpanDSP - a series of DSP components for telephony | |
| 3 * | |
| 4 * lpc10_encdecs.h - LPC10 low bit rate speech codec. | |
| 5 * | |
| 6 * Written by Steve Underwood <steveu@coppice.org> | |
| 7 * | |
| 8 * Copyright (C) 2006 Steve Underwood | |
| 9 * | |
| 10 * All rights reserved. | |
| 11 * | |
| 12 * This program is free software; you can redistribute it and/or modify | |
| 13 * it under the terms of the GNU Lesser General Public License version 2.1, | |
| 14 * as published by the Free Software Foundation. | |
| 15 * | |
| 16 * This program is distributed in the hope that it will be useful, | |
| 17 * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 19 * GNU Lesser General Public License for more details. | |
| 20 * | |
| 21 * You should have received a copy of the GNU Lesser General Public | |
| 22 * License along with this program; if not, write to the Free Software | |
| 23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
| 24 * | |
| 25 * $Id: lpc10_encdecs.h,v 1.11 2008/04/17 14:26:56 steveu Exp $ | |
| 26 */ | |
| 27 | |
| 28 #define LPC10_ORDER 10 | |
| 29 | |
| 30 #if !defined(min) | |
| 31 #define min(a,b) ((a) <= (b) ? (a) : (b)) | |
| 32 #endif | |
| 33 #if !defined(max) | |
| 34 #define max(a,b) ((a) >= (b) ? (a) : (b)) | |
| 35 #endif | |
| 36 | |
| 37 void lpc10_placea(int32_t *ipitch, | |
| 38 int32_t voibuf[4][2], | |
| 39 int32_t *obound, | |
| 40 int32_t af, | |
| 41 int32_t vwin[3][2], | |
| 42 int32_t awin[3][2], | |
| 43 int32_t ewin[3][2], | |
| 44 int32_t lframe, | |
| 45 int32_t maxwin); | |
| 46 | |
| 47 void lpc10_placev(int32_t *osbuf, | |
| 48 int32_t *osptr, | |
| 49 int32_t oslen, | |
| 50 int32_t *obound, | |
| 51 int32_t vwin[3][2], | |
| 52 int32_t af, | |
| 53 int32_t lframe, | |
| 54 int32_t minwin, | |
| 55 int32_t maxwin, | |
| 56 int32_t dvwinl, | |
| 57 int32_t dvwinh); | |
| 58 | |
| 59 void lpc10_voicing(lpc10_encode_state_t *st, | |
| 60 int32_t *vwin, | |
| 61 float *inbuf, | |
| 62 float *lpbuf, | |
| 63 const int32_t buflim[], | |
| 64 int32_t half, | |
| 65 float *minamd, | |
| 66 float *maxamd, | |
| 67 int32_t *mintau, | |
| 68 float *ivrc, | |
| 69 int32_t *obound); | |
| 70 | |
| 71 void lpc10_analyse(lpc10_encode_state_t *st, float *speech, int32_t *voice, int32_t *pitch, float *rms, float rc[]); | |
| 72 | |
| 73 static __inline__ int32_t pow_ii(int32_t x, int32_t n) | |
| 74 { | |
| 75 int32_t pow; | |
| 76 uint32_t u; | |
| 77 | |
| 78 if (n <= 0) | |
| 79 { | |
| 80 if (n == 0 || x == 1) | |
| 81 return 1; | |
| 82 if (x != -1) | |
| 83 return (x == 0) ? 1/x : 0; | |
| 84 n = -n; | |
| 85 } | |
| 86 u = n; | |
| 87 for (pow = 1; ; ) | |
| 88 { | |
| 89 if ((u & 1)) | |
| 90 pow *= x; | |
| 91 if ((u >>= 1) == 0) | |
| 92 break; | |
| 93 x *= x; | |
| 94 } | |
| 95 return pow; | |
| 96 } | |
| 97 /*- End of function --------------------------------------------------------*/ | |
| 98 | |
| 99 static __inline__ float r_sign(float a, float b) | |
| 100 { | |
| 101 float x; | |
| 102 | |
| 103 x = fabsf(a); | |
| 104 return (b >= 0.0f) ? x : -x; | |
| 105 } | |
| 106 /*- End of function --------------------------------------------------------*/ | |
| 107 /*- End of file ------------------------------------------------------------*/ |