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comparison spandsp-0.0.6pre17/src/spandsp/private/lpc10.h @ 4:26cd8f1ef0b1

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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
1 /*
2 * SpanDSP - a series of DSP components for telephony
3 *
4 * private/lpc10.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.h,v 1.3 2009/04/12 09:12:11 steveu Exp $
26 */
27
28 #if !defined(_SPANDSP_PRIVATE_LPC10_H_)
29 #define _SPANDSP_PRIVATE_LPC10_H_
30
31 /*!
32 LPC10 codec encoder state descriptor. This defines the state of
33 a single working instance of the LPC10 encoder.
34 */
35 struct lpc10_encode_state_s
36 {
37 /*! \brief ??? */
38 int error_correction;
39
40 /* State used only by function high_pass_100hz */
41 /*! \brief ??? */
42 float z11;
43 /*! \brief ??? */
44 float z21;
45 /*! \brief ??? */
46 float z12;
47 /*! \brief ??? */
48 float z22;
49
50 /* State used by function lpc10_analyse */
51 /*! \brief ??? */
52 float inbuf[LPC10_SAMPLES_PER_FRAME*3];
53 /*! \brief ??? */
54 float pebuf[LPC10_SAMPLES_PER_FRAME*3];
55 /*! \brief ??? */
56 float lpbuf[696];
57 /*! \brief ??? */
58 float ivbuf[312];
59 /*! \brief ??? */
60 float bias;
61 /*! \brief No initial value necessary */
62 int32_t osbuf[10];
63 /*! \brief Initial value 1 */
64 int32_t osptr;
65 /*! \brief ??? */
66 int32_t obound[3];
67 /*! \brief Initial value vwin[2][0] = 307; vwin[2][1] = 462; */
68 int32_t vwin[3][2];
69 /*! \brief Initial value awin[2][0] = 307; awin[2][1] = 462; */
70 int32_t awin[3][2];
71 /*! \brief ??? */
72 int32_t voibuf[4][2];
73 /*! \brief ??? */
74 float rmsbuf[3];
75 /*! \brief ??? */
76 float rcbuf[3][10];
77 /*! \brief ??? */
78 float zpre;
79
80 /* State used by function onset */
81 /*! \brief ??? */
82 float n;
83 /*! \brief Initial value 1.0f */
84 float d__;
85 /*! \brief No initial value necessary */
86 float fpc;
87 /*! \brief ??? */
88 float l2buf[16];
89 /*! \brief ??? */
90 float l2sum1;
91 /*! \brief Initial value 1 */
92 int32_t l2ptr1;
93 /*! \brief Initial value 9 */
94 int32_t l2ptr2;
95 /*! \brief No initial value necessary */
96 int32_t lasti;
97 /*! \brief Initial value FALSE */
98 int hyst;
99
100 /* State used by function lpc10_voicing */
101 /*! \brief Initial value 20.0f */
102 float dither;
103 /*! \brief ??? */
104 float snr;
105 /*! \brief ??? */
106 float maxmin;
107 /*! \brief Initial value is probably unnecessary */
108 float voice[3][2];
109 /*! \brief ??? */
110 int32_t lbve;
111 /*! \brief ??? */
112 int32_t lbue;
113 /*! \brief ??? */
114 int32_t fbve;
115 /*! \brief ??? */
116 int32_t fbue;
117 /*! \brief ??? */
118 int32_t ofbue;
119 /*! \brief ??? */
120 int32_t sfbue;
121 /*! \brief ??? */
122 int32_t olbue;
123 /*! \brief ??? */
124 int32_t slbue;
125
126 /* State used by function dynamic_pitch_tracking */
127 /*! \brief ??? */
128 float s[60];
129 /*! \brief ??? */
130 int32_t p[2][60];
131 /*! \brief ??? */
132 int32_t ipoint;
133 /*! \brief ??? */
134 float alphax;
135
136 /* State used by function lpc10_pack */
137 /*! \brief ??? */
138 int32_t isync;
139 };
140
141 /*!
142 LPC10 codec decoder state descriptor. This defines the state of
143 a single working instance of the LPC10 decoder.
144 */
145 struct lpc10_decode_state_s
146 {
147 /*! \brief ??? */
148 int error_correction;
149
150 /* State used by function decode */
151 /*! \brief Initial value 60 */
152 int32_t iptold;
153 /*! \brief Initial value TRUE */
154 int first;
155 /*! \brief ??? */
156 int32_t ivp2h;
157 /*! \brief ??? */
158 int32_t iovoic;
159 /*! \brief Initial value 60. */
160 int32_t iavgp;
161 /*! \brief ??? */
162 int32_t erate;
163 /*! \brief ??? */
164 int32_t drc[10][3];
165 /*! \brief ??? */
166 int32_t dpit[3];
167 /*! \brief ??? */
168 int32_t drms[3];
169
170 /* State used by function synths */
171 /*! \brief ??? */
172 float buf[LPC10_SAMPLES_PER_FRAME*2];
173 /*! \brief Initial value LPC10_SAMPLES_PER_FRAME */
174 int32_t buflen;
175
176 /* State used by function pitsyn */
177 /*! \brief No initial value necessary as long as first_pitsyn is initially TRUE */
178 int32_t ivoico;
179 /*! \brief No initial value necessary as long as first_pitsyn is initially TRUE */
180 int32_t ipito;
181 /*! \brief Initial value 1.0f */
182 float rmso;
183 /*! \brief No initial value necessary as long as first_pitsyn is initially TRUE */
184 float rco[10];
185 /*! \brief No initial value necessary as long as first_pitsyn is initially TRUE */
186 int32_t jsamp;
187 /*! \brief Initial value TRUE */
188 int first_pitsyn;
189
190 /* State used by function bsynz */
191 /*! \brief ??? */
192 int32_t ipo;
193 /*! \brief ??? */
194 float exc[166];
195 /*! \brief ??? */
196 float exc2[166];
197 /*! \brief ??? */
198 float lpi[3];
199 /*! \brief ??? */
200 float hpi[3];
201 /*! \brief ??? */
202 float rmso_bsynz;
203
204 /* State used by function random */
205 /*! \brief ??? */
206 int32_t j;
207 /*! \brief ??? */
208 int32_t k;
209 /*! \brief ??? */
210 int16_t y[5];
211
212 /* State used by function deemp */
213 /*! \brief ??? */
214 float dei[2];
215 /*! \brief ??? */
216 float deo[3];
217 };
218
219 #endif
220 /*- End of include ---------------------------------------------------------*/

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