00001 /* 00002 * SpanDSP - a series of DSP components for telephony 00003 * 00004 * private/lpc10.h - LPC10 low bit rate speech codec. 00005 * 00006 * Written by Steve Underwood <steveu@coppice.org> 00007 * 00008 * Copyright (C) 2006 Steve Underwood 00009 * 00010 * All rights reserved. 00011 * 00012 * This program is free software; you can redistribute it and/or modify 00013 * it under the terms of the GNU Lesser General Public License version 2.1, 00014 * as published by the Free Software Foundation. 00015 * 00016 * This program is distributed in the hope that it will be useful, 00017 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00018 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00019 * GNU Lesser General Public License for more details. 00020 * 00021 * You should have received a copy of the GNU Lesser General Public 00022 * License along with this program; if not, write to the Free Software 00023 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 00024 * 00025 * $Id: lpc10.h,v 1.1 2008/11/30 05:43:37 steveu Exp $ 00026 */ 00027 00028 #if !defined(_SPANDSP_PRIVATE_LPC10_H_) 00029 #define _SPANDSP_PRIVATE_LPC10_H_ 00030 00031 /*! 00032 LPC10 codec encoder state descriptor. This defines the state of 00033 a single working instance of the LPC10 encoder. 00034 */ 00035 struct lpc10_encode_state_s 00036 { 00037 int error_correction; 00038 00039 /* State used only by function high_pass_100hz */ 00040 float z11; 00041 float z21; 00042 float z12; 00043 float z22; 00044 00045 /* State used by function lpc10_analyse */ 00046 float inbuf[LPC10_SAMPLES_PER_FRAME*3]; 00047 float pebuf[LPC10_SAMPLES_PER_FRAME*3]; 00048 float lpbuf[696]; 00049 float ivbuf[312]; 00050 float bias; 00051 int32_t osbuf[10]; /* No initial value necessary */ 00052 int32_t osptr; /* Initial value 1 */ 00053 int32_t obound[3]; 00054 int32_t vwin[3][2]; /* Initial value vwin[2][0] = 307; vwin[2][1] = 462; */ 00055 int32_t awin[3][2]; /* Initial value awin[2][0] = 307; awin[2][1] = 462; */ 00056 int32_t voibuf[4][2]; 00057 float rmsbuf[3]; 00058 float rcbuf[3][10]; 00059 float zpre; 00060 00061 /* State used by function onset */ 00062 float n; 00063 float d__; /* Initial value 1.0f */ 00064 float fpc; /* No initial value necessary */ 00065 float l2buf[16]; 00066 float l2sum1; 00067 int32_t l2ptr1; /* Initial value 1 */ 00068 int32_t l2ptr2; /* Initial value 9 */ 00069 int32_t lasti; /* No initial value necessary */ 00070 int hyst; /* Initial value FALSE */ 00071 00072 /* State used by function lpc10_voicing */ 00073 float dither; /* Initial value 20.0f */ 00074 float snr; 00075 float maxmin; 00076 float voice[3][2]; /* Initial value is probably unnecessary */ 00077 int32_t lbve; 00078 int32_t lbue; 00079 int32_t fbve; 00080 int32_t fbue; 00081 int32_t ofbue; 00082 int32_t sfbue; 00083 int32_t olbue; 00084 int32_t slbue; 00085 00086 /* State used by function dynamic_pitch_tracking */ 00087 float s[60]; 00088 int32_t p[2][60]; 00089 int32_t ipoint; 00090 float alphax; 00091 00092 /* State used by function lpc10_pack */ 00093 int32_t isync; 00094 }; 00095 00096 /*! 00097 LPC10 codec decoder state descriptor. This defines the state of 00098 a single working instance of the LPC10 decoder. 00099 */ 00100 struct lpc10_decode_state_s 00101 { 00102 int error_correction; 00103 00104 /* State used by function decode */ 00105 int32_t iptold; /* Initial value 60 */ 00106 int first; /* Initial value TRUE */ 00107 int32_t ivp2h; 00108 int32_t iovoic; 00109 int32_t iavgp; /* Initial value 60 */ 00110 int32_t erate; 00111 int32_t drc[10][3]; 00112 int32_t dpit[3]; 00113 int32_t drms[3]; 00114 00115 /* State used by function synths */ 00116 float buf[LPC10_SAMPLES_PER_FRAME*2]; 00117 int32_t buflen; /* Initial value LPC10_SAMPLES_PER_FRAME */ 00118 00119 /* State used by function pitsyn */ 00120 int32_t ivoico; /* No initial value necessary as long as first_pitsyn is initially TRUE_ */ 00121 int32_t ipito; /* No initial value necessary as long as first_pitsyn is initially TRUE_ */ 00122 float rmso; /* Initial value 1.0f */ 00123 float rco[10]; /* No initial value necessary as long as first_pitsyn is initially TRUE_ */ 00124 int32_t jsamp; /* Nno initial value necessary as long as first_pitsyn is initially TRUE_ */ 00125 int first_pitsyn; /* Initial value TRUE */ 00126 00127 /* State used by function bsynz */ 00128 int32_t ipo; 00129 float exc[166]; 00130 float exc2[166]; 00131 float lpi[3]; 00132 float hpi[3]; 00133 float rmso_bsynz; 00134 00135 /* State used by function random */ 00136 int32_t j; 00137 int32_t k; 00138 int16_t y[5]; 00139 00140 /* State used by function deemp */ 00141 float dei[2]; 00142 float deo[3]; 00143 }; 00144 00145 #endif 00146 /*- End of include ---------------------------------------------------------*/