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5
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1 /*
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2 * SpanDSP - a series of DSP components for telephony
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3 *
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4 * lpc10_encdecs.h - LPC10 low bit rate speech codec.
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5 *
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6 * Written by Steve Underwood <steveu@coppice.org>
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7 *
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8 * Copyright (C) 2006 Steve Underwood
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9 *
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10 * All rights reserved.
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11 *
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12 * This program is free software; you can redistribute it and/or modify
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13 * it under the terms of the GNU General Public License version 2, as
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14 * published by the Free Software Foundation.
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15 *
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16 * This program is distributed in the hope that it will be useful,
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17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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19 * GNU General Public License for more details.
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20 *
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21 * You should have received a copy of the GNU General Public License
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22 * along with this program; if not, write to the Free Software
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23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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24 *
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25 * $Id: lpc10_encdecs.h,v 1.9 2006/11/30 15:41:47 steveu Exp $
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26 */
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27
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28 #define LPC10_ORDER 10
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29
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30 #if !defined(min)
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31 #define min(a,b) ((a) <= (b) ? (a) : (b))
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32 #endif
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33 #if !defined(max)
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34 #define max(a,b) ((a) >= (b) ? (a) : (b))
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35 #endif
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36
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37 void lpc10_placea(int32_t *ipitch,
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38 int32_t voibuf[4][2],
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39 int32_t *obound,
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40 int32_t af,
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41 int32_t vwin[3][2],
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42 int32_t awin[3][2],
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43 int32_t ewin[3][2],
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44 int32_t lframe,
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45 int32_t maxwin);
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46
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47 void lpc10_placev(int32_t *osbuf,
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48 int32_t *osptr,
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49 int32_t oslen,
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50 int32_t *obound,
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51 int32_t vwin[3][2],
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52 int32_t af,
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53 int32_t lframe,
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54 int32_t minwin,
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55 int32_t maxwin,
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56 int32_t dvwinl,
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57 int32_t dvwinh);
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58
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59 void lpc10_voicing(lpc10_encode_state_t *st,
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60 int32_t *vwin,
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61 float *inbuf,
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62 float *lpbuf,
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63 const int32_t buflim[],
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64 int32_t half,
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65 float *minamd,
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66 float *maxamd,
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67 int32_t *mintau,
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68 float *ivrc,
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69 int32_t *obound);
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70
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71 void lpc10_analyse(lpc10_encode_state_t *st, float *speech, int32_t *voice, int32_t *pitch, float *rms, float rc[]);
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72
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73 static __inline__ int32_t pow_ii(int32_t x, int32_t n)
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74 {
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75 int32_t pow;
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76 uint32_t u;
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77
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78 if (n <= 0)
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79 {
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80 if (n == 0 || x == 1)
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81 return 1;
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82 if (x != -1)
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83 return (x == 0) ? 1/x : 0;
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84 n = -n;
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85 }
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86 u = n;
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87 for (pow = 1; ; )
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88 {
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89 if ((u & 1))
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90 pow *= x;
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91 if ((u >>= 1) == 0)
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92 break;
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93 x *= x;
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94 }
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95 return pow;
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96 }
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97 /*- End of function --------------------------------------------------------*/
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98
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99 static __inline__ float r_sign(float a, float b)
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100 {
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101 float x;
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102
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103 x = fabsf(a);
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104 return (b >= 0.0f) ? x : -x;
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105 }
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106 /*- End of function --------------------------------------------------------*/
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107 /*- End of file ------------------------------------------------------------*/
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