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annotate host.c @ 6:9cbb19619a9f default tip

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README: punctuation fix
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 20 Aug 2024 19:00:23 +0000
parents 9008dbc8ca74
children
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1 /***************************************************************************
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2 *
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3 * File Name: host.c
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4 *
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5 * Purpose: Contains functions for file I/O and formatting, no signal
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6 * processing.
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7 *
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8 * The functions in this file are listed below. All are level 2
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9 * fuctions, where level 0 is main(), except for fillBitAlloc() which
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10 * is level 3. The two "Interface" routines perform truncation of the
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11 * three least significant bits of the 16 bit linear input. The others
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12 * are simply file I/O functions and data reformatters.
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13 *
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14 * fillBitAlloc()
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15 * hostEncoderInterface()
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16 * readDecfile()
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17 * speechDecoderHostInterface()
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18 * writeEncfile()
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19 *
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20 **************************************************************************/
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21
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22 /*_________________________________________________________________________
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23 | |
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24 | Include Files |
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25 |_________________________________________________________________________|
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26 */
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27
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28 #include <stdio.h>
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29 #include "typedefs.h"
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30
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31 /***************************************************************************
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32 *
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33 * FUNCTION NAME: fillBitAlloc
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34 *
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35 * PURPOSE:
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36 *
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37 * Arrange speech parameters for encoder output
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38 *
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39 * INPUTS:
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40 *
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41 * The speechcoders codewords:
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42 * iR0 - Frame energy
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43 * piVqIndeces[0:2] - LPC vector quantizer codewords
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44 * iSoftInterp - Soft interpolation bit 1 or 0
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45 * iVoicing - voicing mode 0,1,2,3
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46 * piLags[0:3] - Frame and delta lag codewords
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47 * piCodeWrdsA[0:3] - VSELP codevector 1
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48 * piCodeWrdsB[0:3] - VSELP codevector 2 (n/a for voiced modes)
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49 * piGsp0s[0:3] - GSP0 codewords
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50 * swVadFlag - voice activity detection flag
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51 * swSP - Speech flag
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52 *
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53 * OUTPUTS:
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54 *
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55 * pswBAlloc[0:20] - an array into which the coded data is moved
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56 *
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57 * RETURN VALUE:
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58 *
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59 * none
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60 *
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61 * REFERENCES: Sub-clause 2.1 and 4.1.12 of GSM Recomendation 06.20
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62 *
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63 **************************************************************************/
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64
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65 void fillBitAlloc(int iVoicing, int iR0, int *piVqIndeces,
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66 int iSoftInterp, int *piLags,
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67 int *piCodeWrdsA, int *piCodeWrdsB,
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68 int *piGsp0s, Shortword swVadFlag,
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69 Shortword swSP, Shortword *pswBAlloc)
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70 {
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71
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72 /*_________________________________________________________________________
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73 | |
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74 | Automatic Variables |
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75 |_________________________________________________________________________|
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76 */
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77
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78 int i;
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79 Shortword *pswNxt;
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80
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81 /*_________________________________________________________________________
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82 | |
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83 | Executable Code |
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84 |_________________________________________________________________________|
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85 */
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86
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87 pswNxt = pswBAlloc;
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88 *pswNxt++ = iR0;
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89 for (i = 0; i < 3; i++)
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90 *pswNxt++ = *piVqIndeces++;
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91 *pswNxt++ = iSoftInterp;
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92 *pswNxt++ = iVoicing;
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93
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94 /* check voicing mode */
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95 if (iVoicing)
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96 {
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97 /* voiced mode */
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98 for (i = 0; i < N_SUB; i++)
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99 {
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100 *pswNxt++ = *piLags++;
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101 *pswNxt++ = *piCodeWrdsA++;
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102 *pswNxt++ = *piGsp0s++;
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103 }
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104 }
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105 else
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106 { /* unvoiced frame */
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107 for (i = 0; i < N_SUB; i++)
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108 {
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109 *pswNxt++ = *piCodeWrdsA++;
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110 *pswNxt++ = *piCodeWrdsB++;
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111 *pswNxt++ = *piGsp0s++;
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112 }
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113 }
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114 *pswNxt++ = swVadFlag;
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115 *pswNxt++ = swSP;
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116 }
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117
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118 /***************************************************************************
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119 *
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120 * FUNCTION NAME: hostEncoderInterface
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121 *
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122 * PURPOSE:
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123 *
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124 * Read in speech data from a file. Zero the least significant 3 bits.
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125 *
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126 *
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127 * INPUTS:
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128 *
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129 * pfileInSpeech
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130 * FILE pointer to the binary input file
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131 *
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132 * iNumToRead
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133 * Number of samples to read from the file, typically
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134 * 160 (20 ms of speech).
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135 *
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136 *
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137 * OUTPUTS:
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138 *
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139 * pswSamplesRead[]
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140 * The speech samples read in from the file.
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141 *
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142 *
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143 * RETURN VALUE:
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144 *
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145 * iNumRead
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146 * The number of samples actually read.
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147 *
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148 * IMPLEMENTATION:
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149 *
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150 * The input speech file should be in "native" format. This means that
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151 * the file is to be read (by this program) and written (by another
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152 * program) as short ints (not chars).
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153 *
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154 * If not enough samples are available in the file, the number actually
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155 * read is returned. If the read fails to fill the requested iNumToRead
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156 * samples, then the rest are zeroed.
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157 *
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158 * In all cases the least significant 3 bits of all speech samples are
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159 * zeroed.
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160 *
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161 * REFERENCES: Sub-clause 4.1 of GSM Recomendation 06.20
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162 *
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163 * KEYWORDS: read, read speech, get speech data
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164 *
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165 **************************************************************************/
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166
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167 int hostEncoderInterface(FILE *pfileInSpeech, int iNumToRead,
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168 Shortword pswSamplesRead[])
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169 {
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170
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171 /*_________________________________________________________________________
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172 | |
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173 | Automatic Variables |
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174 |_________________________________________________________________________|
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175 */
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176 int iNumRead,
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177 i;
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178
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179 /*_________________________________________________________________________
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180 | |
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181 | Executable Code |
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182 |_________________________________________________________________________|
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183 */
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184
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185 iNumRead = fread((char *) pswSamplesRead, sizeof (Shortword),
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186 iNumToRead, pfileInSpeech);
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187
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188 /* Delete the 3 LSB's - 13 bit speech input */
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189 /*------------------------------------------*/
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190
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191 for (i = 0; i < iNumRead; i++)
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192 {
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193 pswSamplesRead[i] &= 0xfff8;
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194 }
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195
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196
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197 /* Fill out the iNumToRead buffer with zeroes */
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198 /*--------------------------------------------*/
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199
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200 if (iNumRead != iNumToRead)
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201 {
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202 for (i = iNumRead; i < iNumToRead; i++)
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203 {
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204 pswSamplesRead[i] = 0;
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205 }
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206 }
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207 return (iNumRead);
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208 }
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209
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210 /***************************************************************************
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211 *
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212 * FUNCTION NAME: readDecfile
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213 *
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214 * PURPOSE:
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215 * Reads decoder parameter input file
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216 *
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217 * INPUT:
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218 * infile decoder parameter input file.
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219 *
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220 * OUTPUT:
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221 * pswSpeechPara array of received 16-bit values
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222 *
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223 * RETURN:
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224 * 0 successfully read a complete frame of data
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225 *
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226 * REFERENCES: Sub-clause 4.2 of GSM Recomendation 06.20
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227 *
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228 * KEYWORDS: pswSpeechPara
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229 *
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230 **************************************************************************/
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231
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232 int readDecfile(FILE *infile, Shortword pswSpeechPara[])
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233 {
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234 if (fread((char *) pswSpeechPara, sizeof (Shortword), 22, infile) == 0)
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235 return (1);
9008dbc8ca74 import original C code from GSM 06.06
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236 else
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237 return (0);
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238 }
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239
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parents:
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240 /***************************************************************************
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241 *
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242 * FUNCTION NAME: speechDecoderHostInterface
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243 *
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244 * PURPOSE:
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245 * The purpose of this function is to truncate the linear pcm and write
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246 * it into the output file
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247 *
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248 * INPUTS:
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249 *
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250 * F_LEN
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251 *
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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252 * 160 = linear pcm output frame size
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253 *
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254 * pswDecodedSpeechFrame[0:F_LEN-1]
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255 *
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256 * 16 bit linear pcm
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257 *
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258 * OUTPUTS:
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259 *
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260 * fpfileSpeechOut
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261 *
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262 * 13 bit linear pcm stored to file given by this pointer
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263 *
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264 * RETURN VALUE:
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265 *
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266 * none
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267 *
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268 * IMPLEMENTATION:
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269 *
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270 * REFERENCES: Sub-clause 4.2 of GSM Recomendation 06.20
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271 *
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272 * KEYWORDS: synthesis, speechdecoder, decoding, truncation
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273 *
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274 **************************************************************************/
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275
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276 void speechDecoderHostInterface(Shortword pswDecodedSpeechFrame[],
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277 FILE *fpfileSpeechOut)
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278 {
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279
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280 /*_________________________________________________________________________
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parents:
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281 | |
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282 | Local Constants |
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283 |_________________________________________________________________________|
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284 */
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285
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286 #define PCM_MASK 0xfff8 /* 16 to 13 bit linear PCM mask */
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parents:
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287
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288 /*_________________________________________________________________________
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289 | |
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290 | Automatic Variables |
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291 |_________________________________________________________________________|
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292 */
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293
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294 short int i;
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295
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296 /*_________________________________________________________________________
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297 | |
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298 | Executable Code |
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299 |_________________________________________________________________________|
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300 */
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301
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302 /* truncate the 16 bit linear pcm to 13 bits */
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303 /* ----------------------------------------- */
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304
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305 for (i = 0; i < F_LEN; i++)
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306 {
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307 pswDecodedSpeechFrame[i] = pswDecodedSpeechFrame[i] & PCM_MASK;
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308 }
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309
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310 /* F_LEN samples of linear pcm to output file */
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311 /* ------------------------------------------ */
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312
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313 fwrite((char *) pswDecodedSpeechFrame, sizeof (Shortword),
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314 F_LEN, fpfileSpeechOut);
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315 }
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316
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317 /***************************************************************************
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318 *
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319 * FUNCTION NAME: writeEncfile
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320 *
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321 * PURPOSE:
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322 * Writes encoded parameters to ouput file
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323 *
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324 * INPUT:
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325 * pswSpeechPara array of encoded parameter words.
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326 *
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327 * OUTPUT:
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328 * fpfileEnc 16-bit encoded values.
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329 *
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330 * RETURN:
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331 * i number of bytes written
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332 *
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333 * REFERENCES: Sub-clause 4.1 of GSM Recomendation 06.20
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334 *
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335 * KEYWORDS: pswSpeechPara, fpfileEnc
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336 *
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337 **************************************************************************
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338 */
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339
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340 int writeEncfile(Shortword pswSpeechPara[], FILE *fpfileEnc)
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341 {
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342 int i;
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343
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344 i = fwrite((char *) pswSpeechPara, sizeof (Shortword), 20, fpfileEnc);
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345
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346 return (i);
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347 }