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annotate src/coder.c @ 5:799b56cbccb6

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EFR2 decoder: add post-processing step from AMR
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 03 Apr 2024 06:09:10 +0000
parents 56410792419a
children
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1 /***************************************************************************
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2 *
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3 * FILE NAME: CODER.C
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4 *
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5 * Main program of the EFR coder at 12.2 kbit/s.
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6 *
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7 * Usage : coder speech_file bitstream_file
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8 *
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9 * Format for speech_file:
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10 * Speech is read from a binary file of 16 bits data.
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11 *
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12 * Format for bitstream_file:
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13 * 244 words (2-byte) containing 244 bits.
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14 * Bit 0 = 0x0000 and Bit 1 = 0x0001
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15 * One word (2-byte) for voice activity decision (VAD) flag bit
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16 * 0x0000 -> inactive (no detected speech activity);
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17 * 0x0001 -> active
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18 * One word (2-byte) for speech (SP) flag bit
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19 * 0x0000 -> inactive (no transmission of speech frames);
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20 * 0x0001 -> active
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21 *
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22 ***************************************************************************/
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23
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24 #include <stdio.h>
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25 #include <stdlib.h>
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26 #include <string.h>
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27 #include "typedef.h"
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28 #include "basic_op.h"
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29 #include "sig_proc.h"
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30 #include "count.h"
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31 #include "codec.h"
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32 #include "cnst.h"
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33 #include "n_stack.h"
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34 #include "e_homing.h"
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35
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36 #include "dtx.h"
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37
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38 Word16 dtx_mode;
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39 extern Word16 txdtx_ctrl;
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40
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41 /* L_FRAME, M, PRM_SIZE, AZ_SIZE, SERIAL_SIZE: defined in "cnst.h" */
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42
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43 int main (int argc, char *argv[])
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44 {
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45 FILE *f_speech; /* File of speech data */
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46 FILE *f_serial; /* File of serial bits for transmission */
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47
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48 extern Word16 *new_speech; /* Pointer to new speech data */
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49
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50 Word16 prm[PRM_SIZE]; /* Analysis parameters. */
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51 Word16 serial[SERIAL_SIZE-1];/* Output bitstream buffer */
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52 Word16 syn[L_FRAME]; /* Buffer for synthesis speech */
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53
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54 Word16 frame;
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55
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56 Word16 vad, sp;
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57
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58 Word16 reset_flag;
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59 Word16 i;
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60
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61 proc_head ("Encoder");
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62
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63 /*----------------------------------------------------------------------*
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64 * Open speech file and result file (output serial bit stream) *
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65 *----------------------------------------------------------------------*/
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66
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67 if ((argc < 3) || (argc > 4))
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68 {
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69 fprintf (stderr,
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70 " Usage:\n\n coder speech_file bitstream_file <dtx|nodtx>\n");
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71 fprintf (stderr, "\n");
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72 exit (1);
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73 }
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74 if ((f_speech = fopen (argv[1], "rb")) == NULL)
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75 {
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76 fprintf (stderr, "Error opening input file %s !!\n", argv[1]);
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77 exit (0);
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78 }
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79 fprintf (stderr, " Input speech file: %s\n", argv[1]);
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80
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81 if ((f_serial = fopen (argv[2], "wb")) == NULL)
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82 {
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83 fprintf (stderr,"Error opening output bitstream file %s !!\n",argv[2]);
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84 exit (0);
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85 }
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86 fprintf (stderr, " Output bitstream file: %s\n", argv[2]);
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87
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88 dtx_mode = 0; /* DTX disabled by default */
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89
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90 if (argc == 4)
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91 {
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92 if (strcmp (argv[3], "nodtx") == 0)
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93 {
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94 dtx_mode = 0;
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95 }
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96 else if (strcmp (argv[3], "dtx") == 0)
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97 {
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98 dtx_mode = 1;
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99 }
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100 else
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101 {
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102 fprintf (stderr, "\nWrong DTX switch: %s !!\n", argv[3]);
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103 exit (1);
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104 }
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105 }
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106 if (dtx_mode == 1)
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107 {
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108 fprintf (stderr, " DTX: enabled\n");
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109 }
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110 else
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111 {
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112 fprintf (stderr, " DTX: disabled\n");
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113 }
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114
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115 /*-----------------------------------------------------------------------*
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116 * Initialisation of the coder. *
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117 *-----------------------------------------------------------------------*/
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118
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119 reset_enc (); /* Bring the encoder, VAD and DTX to the initial state */
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120
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121 Init_WMOPS_counter ();
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122
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123 /* Loop for each "L_FRAME" speech data. */
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124
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125 frame = 0;
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126 while (fread (new_speech, sizeof (Word16), L_FRAME, f_speech) == L_FRAME)
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127 {
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128 #if(WMOPS)
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129 fprintf (stderr, "frame=%d ", ++frame);
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130 #else
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131 fprintf (stderr, "\nframe=%d ", ++frame);
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132 #endif
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133
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134 /* Check whether this frame is an encoder homing frame */
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135 reset_flag = encoder_homing_frame_test (new_speech);
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136
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137 #if (WMOPS)
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138 Reset_WMOPS_counter (); /* reset WMOPS counter for the new frame */
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139 #endif
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140
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141 for (i = 0; i < L_FRAME; i++) /* Delete the 3 LSBs (13-bit input) */
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142 {
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143 new_speech[i] = new_speech[i] & 0xfff8; logic16 (); move16 ();
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144 }
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145
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146 Pre_Process (new_speech, L_FRAME); /* filter + downscaling */
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147
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148 #if (WMOPS)
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149 fwc (); /* function worst case */
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150 #endif
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151
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152 Coder_12k2 (prm, syn); /* Find speech parameters */
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153
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154 test (); logic16 ();
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155 if ((txdtx_ctrl & TX_SP_FLAG) == 0)
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156 {
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157 /* Write comfort noise parameters into the parameter frame.
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158 Use old parameters in case SID frame is not to be updated */
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159 CN_encoding (prm, txdtx_ctrl);
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160 }
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161 Prm2bits_12k2 (prm, &serial[0]); /* Parameters to serial bits */
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162
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163 #if (WMOPS)
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164 fwc (); /* function worst case */
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165 #endif
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166
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167 test (); logic16 ();
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168 if ((txdtx_ctrl & TX_SP_FLAG) == 0)
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169 {
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170 /* Insert SID codeword into the serial parameter frame */
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171 sid_codeword_encoding (&serial[0]);
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172 }
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173
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174 #if (WMOPS)
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175 fwc (); /* function worst case */
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176 #endif
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177
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178 #if (WMOPS)
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179 WMOPS_output (dtx_mode);/* output speech encoder WMOPS values
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180 for current frame */
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181 #endif
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182
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183 /* Write the bit stream to file */
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184 fwrite (serial, sizeof (Word16), (SERIAL_SIZE-1), f_serial);
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185
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186 /* Write the VAD- and SP-flags to file after the speech
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187 parameter bit stream */
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188 vad = 0;
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189 sp = 0;
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190
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191 if ((txdtx_ctrl & TX_VAD_FLAG) != 0)
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192 {
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193 vad = 1;
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194 }
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195 if ((txdtx_ctrl & TX_SP_FLAG) != 0)
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196 {
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197 sp = 1;
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198 }
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199 fwrite (&vad, sizeof (Word16), 1, f_serial);
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200 fwrite (&sp, sizeof (Word16), 1, f_serial);
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201
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202 if (reset_flag != 0)
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203 {
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204 reset_enc (); /*Bring the encoder, VAD and DTX to the home state */
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205 }
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206 }
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207
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208 return (0);
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209 }