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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 * gsm0610.h - GSM 06.10 full 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: gsm0610.h,v 1.7 2006/10/24 13:45:28 steveu Exp $
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26 */
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27
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28 #if !defined(_GSM0610_H_)
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29 #define _GSM0610_H_
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30
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31 /*! \page gsm0610_page GSM 06.10 encoding and decoding
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32 \section gsm0610_page_sec_1 What does it do?
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33
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34 The GSM 06.10 module is an version of the widely used GSM FR codec software
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35 available from http://kbs.cs.tu-berlin.de/~jutta/toast.html. This version
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36 was produced since some versions of this codec are not bit exact, or not
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37 very efficient on modern processors. This implementation can use MMX instructions
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38 on Pentium class processors, or alternative methods on other processors. It
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39 passes all the ETSI test vectors. That is, it is a tested bit exact implementation.
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40
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41 This implementation supports encoded data in one of three packing formats:
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42 - Unpacked, with the 76 parameters of a GSM 06.10 code frame each occupying a
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43 separate byte. (note that none of the parameters exceed 8 bits).
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44 - Packed the the 33 byte per frame, used for VoIP, where 4 bits per frame are wasted.
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45 - Packed in WAV49 format, where 2 frames are packed into 65 bytes.
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46
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47 \section gsm0610_page_sec_2 How does it work?
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48 ???.
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49 */
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50
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51 enum
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52 {
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53 GSM0610_PACKING_NONE,
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54 GSM0610_PACKING_WAV49,
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55 GSM0610_PACKING_VOIP
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56 };
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57
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58 /*!
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59 GSM 06.10 FR codec unpacked frame.
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60 */
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61 typedef struct
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62 {
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63 int16_t LARc[8];
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64 int16_t Nc[4];
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65 int16_t bc[4];
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66 int16_t Mc[4];
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67 int16_t xmaxc[4];
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68 int16_t xMc[4][13];
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69 } gsm0610_frame_t;
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70
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71 /*!
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72 GSM 06.10 FR codec state descriptor. This defines the state of
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73 a single working instance of the GSM 06.10 FR encoder or decoder.
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74 */
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75 typedef struct
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76 {
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77 /*! \brief One of the packing modes */
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78 int packing;
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79
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80 int16_t dp0[280];
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81
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82 int16_t z1; /* preprocessing, Offset_com. */
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83 int32_t L_z2; /* Offset_com. */
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84 int16_t mp; /* Preemphasis */
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85
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86 int16_t u[8]; /* short_term_delay_filter */
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87 int16_t LARpp[2][8];
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88 int16_t j;
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89
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90 int16_t nrp; /* long term synthesis */
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91 int16_t v[9]; /* short term synthesis */
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92 int16_t msr; /* decoder postprocessing */
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93
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94 int16_t e[50]; /* encoder */
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95 uint8_t frame_index;
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96 uint8_t frame_chain;
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97 } gsm0610_state_t;
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98
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99 #ifdef __cplusplus
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100 extern "C" {
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101 #endif
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102
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103 /*! Initialise a GSM 06.10 encode or decode context.
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104 \param s The GSM 06.10 context
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105 \param packing One of the GSM0610_PACKING_xxx options.
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106 \return A pointer to the GSM 06.10 context, or NULL for error. */
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107 gsm0610_state_t *gsm0610_init(gsm0610_state_t *s, int packing);
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108
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109 int gsm0610_release(gsm0610_state_t *s);
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110
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111 /*! Encode a buffer of linear PCM data to GSM 06.10.
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112 \param s The GSM 06.10 context.
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113 \param ima_data The GSM 06.10 data produced.
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114 \param amp The audio sample buffer.
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115 \param len The number of samples in the buffer.
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116 \return The number of bytes of GSM 06.10 data produced. */
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117 int gsm0610_encode(gsm0610_state_t *s, uint8_t code[], const int16_t amp[], int quant);
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118
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119 /*! Decode a buffer of GSM 06.10 data to linear PCM.
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120 \param s The GSM 06.10 context.
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121 \param amp The audio sample buffer.
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122 \param code The GSM 06.10 data.
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123 \param quant The number of frames of GSM 06.10 data to be decoded.
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124 \return The number of samples returned. */
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125 int gsm0610_decode(gsm0610_state_t *s, int16_t amp[], const uint8_t code[], int quant);
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126
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127 int gsm0610_pack_none(uint8_t c[], gsm0610_frame_t *s);
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128
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129 int gsm0610_pack_wav49(uint8_t c[], gsm0610_frame_t *s, int half);
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130
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131 int gsm0610_pack_voip(uint8_t c[], gsm0610_frame_t *s);
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132
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133 int gsm0610_unpack_none(gsm0610_frame_t *s, const uint8_t c[]);
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134
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135 int gsm0610_unpack_wav49(gsm0610_frame_t *s, const uint8_t c[], int half);
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136
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137 int gsm0610_unpack_voip(gsm0610_frame_t *s, const uint8_t c[]);
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138
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139 #ifdef __cplusplus
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140 }
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141 #endif
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142
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143 #endif
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144 /*- End of include ---------------------------------------------------------*/
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