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comparison spandsp-0.0.3/spandsp-0.0.3/src/gsm0610_local.h @ 5:f762bf195c4b

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import spandsp-0.0.3
author Peter Meerwald <pmeerw@cosy.sbg.ac.at>
date Fri, 25 Jun 2010 16:00:21 +0200
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4:26cd8f1ef0b1 5:f762bf195c4b
1 /*
2 * SpanDSP - a series of DSP components for telephony
3 *
4 * gsm0610_local.h - GSM 06.10 full 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 General Public License version 2, as
14 * 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 General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 *
25 * This code is based on the widely used GSM 06.10 code available from
26 * http://kbs.cs.tu-berlin.de/~jutta/toast.html
27 *
28 * $Id: gsm0610_local.h,v 1.6 2006/10/24 13:45:25 steveu Exp $
29 */
30
31 #if !defined(_GSM0610_LOCAL_H_)
32 #define _GSM0610_LOCAL_H_
33
34 #define GSM0610_FRAME_LEN 160
35
36 #define GSM0610_MAGIC 0xD
37
38 static __inline__ int16_t gsm_add(int16_t a, int16_t b)
39 {
40 #if defined(__GNUC__) && defined(__i386__)
41 __asm__ __volatile__(
42 " addw %2,%0;\n"
43 " jno 0f;\n"
44 " movw $0x7fff,%0;\n"
45 " adcw $0,%0;\n"
46 "0:"
47 : "=r" (a)
48 : "0" (a), "ir" (b)
49 : "cc"
50 );
51 return a;
52 #else
53 int32_t sum;
54
55 sum = (int32_t) a + (int32_t) b;
56 return saturate(sum);
57 #endif
58 }
59 /*- End of function --------------------------------------------------------*/
60
61 static __inline__ int32_t gsm_l_add(int32_t a, int32_t b)
62 {
63 #if defined(__i386__)
64 __asm__ __volatile__(
65 " addl %2,%0;\n"
66 " jno 0f;\n"
67 " movl $0x7fffffff,%0;\n"
68 " adcl $0,%0;\n"
69 "0:"
70 : "=r" (a)
71 : "0" (a), "ir" (b)
72 : "cc"
73 );
74 return a;
75 #else
76 uint32_t A;
77
78 if (a < 0)
79 {
80 if (b >= 0)
81 return a + b;
82 /*endif*/
83 A = (uint32_t) -(a + 1) + (uint32_t) -(b + 1);
84 return (A >= INT32_MAX) ? INT32_MIN : -(int32_t) A - 2;
85 }
86 /*endif*/
87 if (b <= 0)
88 return a + b;
89 /*endif*/
90 A = (uint32_t) a + (uint32_t) b;
91 return (A > INT32_MAX) ? INT32_MAX : A;
92 #endif
93 }
94 /*- End of function --------------------------------------------------------*/
95
96 static __inline__ int16_t gsm_sub(int16_t a, int16_t b)
97 {
98 int32_t diff;
99
100 diff = (int32_t) a - (int32_t) b;
101 return saturate(diff);
102 }
103 /*- End of function --------------------------------------------------------*/
104
105 static __inline__ int16_t gsm_mult(int16_t a, int16_t b)
106 {
107 if (a == INT16_MIN && b == INT16_MIN)
108 return INT16_MAX;
109 /*endif*/
110 return ((int32_t) a * (int32_t) b) >> 15;
111 }
112 /*- End of function --------------------------------------------------------*/
113
114 static __inline__ int32_t gsm_l_mult(int16_t a, int16_t b)
115 {
116 assert (a != INT16_MIN || b != INT16_MIN);
117 return ((int32_t) a * (int32_t) b) << 1;
118 }
119 /*- End of function --------------------------------------------------------*/
120
121 static __inline__ int16_t gsm_mult_r(int16_t a, int16_t b)
122 {
123 int32_t prod;
124
125 if (b == INT16_MIN && a == INT16_MIN)
126 return INT16_MAX;
127 /*endif*/
128 prod = (int32_t) a * (int32_t) b + 16384;
129 prod >>= 15;
130 return prod & 0xFFFF;
131 }
132 /*- End of function --------------------------------------------------------*/
133
134 static __inline__ int16_t gsm_abs(int16_t a)
135 {
136 return (a == INT16_MIN) ? INT16_MAX : abs(a);
137 }
138 /*- End of function --------------------------------------------------------*/
139
140 static __inline__ int16_t gsm_asr(int16_t a, int n)
141 {
142 if (n >= 16)
143 return -(a < 0);
144 /*endif*/
145 if (n <= -16)
146 return 0;
147 /*endif*/
148 if (n < 0)
149 return a << -n;
150 /*endif*/
151 return a >> n;
152 }
153 /*- End of function --------------------------------------------------------*/
154
155 static __inline__ int16_t gsm_asl(int16_t a, int n)
156 {
157 if (n >= 16)
158 return 0;
159 /*endif*/
160 if (n <= -16)
161 return -(a < 0);
162 /*endif*/
163 if (n < 0)
164 return gsm_asr(a, -n);
165 /*endif*/
166 return a << n;
167 }
168 /*- End of function --------------------------------------------------------*/
169
170 extern void gsm0610_long_term_predictor(gsm0610_state_t *s,
171 int16_t d[40],
172 int16_t *dp, /* [-120..-1] d' IN */
173 int16_t e[40],
174 int16_t dpp[40],
175 int16_t *Nc,
176 int16_t *bc);
177
178 extern void gsm0610_lpc_analysis(gsm0610_state_t *s,
179 int16_t amp[160],
180 int16_t LARc[8]);
181
182 extern void gsm0610_preprocess(gsm0610_state_t *s,
183 const int16_t amp[],
184 int16_t so[]);
185
186 extern void gsm0610_short_term_analysis_filter(gsm0610_state_t *s,
187 int16_t LARc[8],
188 int16_t amp[160]);
189
190 extern void gsm0610_long_term_synthesis_filtering(gsm0610_state_t *s,
191 int16_t Ncr,
192 int16_t bcr,
193 int16_t erp[40],
194 int16_t *drp); /* [-120..-1] IN, [0..40] OUT */
195
196 extern void gsm0610_rpe_decoding(gsm0610_state_t *s,
197 int16_t xmaxcr,
198 int16_t Mcr,
199 int16_t *xMcr, /* [0..12], 3 bits IN */
200 int16_t erp[40]);
201
202 extern void gsm0610_rpe_encoding(gsm0610_state_t *s,
203 int16_t *e, /* [-5..-1][0..39][40..44] IN/OUT */
204 int16_t *xmaxc,
205 int16_t *Mc,
206 int16_t xMc[13]);
207
208 extern void gsm0610_short_term_synthesis_filter(gsm0610_state_t *s,
209 int16_t LARcr[8],
210 int16_t drp[40],
211 int16_t amp[160]);
212
213 extern int16_t gsm0610_norm(int32_t a);
214
215 #if defined(__GNUC__) && defined(__i386__)
216
217 void gsm0610_vec_vsraw(const int16_t *p, int n, int bits);
218
219 int32_t gsm0610_vec_iprod(const int16_t *p, const int16_t *q, int n);
220
221 int32_t gsm0610_vec_maxmin(const int16_t *p, int n, int16_t *out);
222
223 int32_t gsm0610_max_cross_corr(const int16_t *wt, const int16_t *dp, int16_t *Nc_out);
224
225 #endif
226
227 #endif
228
229 /*- End of include ---------------------------------------------------------*/

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