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annotate src/decoder.c @ 2:c511bfb36c2a

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beginning of EFR2 decoder, using AMR version of AGC module
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 03 Apr 2024 05:47:51 +0000
parents 56410792419a
children 799b56cbccb6
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1 /***************************************************************************
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2 *
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3 * FILE NAME: decoder.c
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4 *
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5 * Usage : decoder bitstream_file synth_file
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6 *
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7 * Format for bitstream_file:
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8 * One word (2-byte) for bad frame indication (BFI) flag bit
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9 * 0x0000 -> good frame; 0x0001 -> bad frame
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10 * 244 words (2-byte) containing 244 bits.
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11 * Bit 0 = 0x0000 and Bit 1 = 0x0001
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12 * One word (2-byte) for ternary Silence Descriptor (SID) flag
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13 * 0x0000 -> inactive (no detected speech activity);
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14 * 0x0001 -> active
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15 * One word (2-byte) for Time Alignment Flag (TAF) bit
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16 * 0x0000 -> inactive (no transmission of speech frames);
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17 * 0x0001 -> active
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18 *
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19 * Format for synth_file:
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20 * Synthesis is written to a binary file of 16 bits data.
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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 "typedef.h"
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27 #include "n_stack.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 "d_homing.h"
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34
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35
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36 /* These constants define the number of consecutive parameters
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37 that function decoder_homing_frame_test() checks */
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38
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39 #define WHOLE_FRAME 57
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40 #define TO_FIRST_SUBFRAME 18
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41
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42
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43 Word16 synth_buf[L_FRAME + M];
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44
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45 /* L_FRAME, M, PRM_SIZE, AZ_SIZE, SERIAL_SIZE: defined in "cnst.h" */
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46
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47 /*-----------------------------------------------------------------*
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48 * Global variables *
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49 *-----------------------------------------------------------------*/
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50
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51 #if (WMOPS)
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52 Word16 dtx_mode = 0;
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53
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54 #endif
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55
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56 /*-----------------------------------------------------------------*
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57 * Main decoder routine *
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58 *-----------------------------------------------------------------*/
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59
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60 int
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61 main (int argc, char *argv[])
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62 {
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63 Word16 *synth; /* Synthesis */
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64 Word16 parm[PRM_SIZE + 1]; /* Synthesis parameters */
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65 Word16 serial[SERIAL_SIZE+2];/* Serial stream */
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66 Word16 Az_dec[AZ_SIZE]; /* Decoded Az for post-filter */
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67 /* in 4 subframes, length= 44 */
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68 Word16 i, frame, temp;
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69 FILE *f_syn, *f_serial;
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70
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71 Word16 TAF, SID_flag;
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72
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73 Word16 reset_flag;
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74 static Word16 reset_flag_old = 1;
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75
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76 proc_head ("Decoder");
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77
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78 /*-----------------------------------------------------------------*
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79 * Read passed arguments and open in/out files *
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80 *-----------------------------------------------------------------*/
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81
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82 if (argc != 3)
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83 {
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84 fprintf (stderr,
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85 " Usage:\n\n decoder bitstream_file synth_file\n");
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86 fprintf (stderr, "\n");
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87 exit (1);
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88 }
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89 /* Open file for synthesis and packed serial stream */
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90
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91 if ((f_serial = fopen (argv[1], "rb")) == NULL)
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92 {
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93 fprintf (stderr, "Input file '%s' does not exist !!\n", argv[1]);
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94 exit (0);
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95 }
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96 else
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97 fprintf (stderr, "Input bitstream file: %s\n", argv[1]);
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98
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99 if ((f_syn = fopen (argv[2], "wb")) == NULL)
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100 {
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101 fprintf (stderr, "Cannot open file '%s' !!\n", argv[2]);
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102 exit (0);
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103 }
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104 else
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105 fprintf (stderr, "Synthesis speech file: %s\n", argv[2]);
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106
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107 /*-----------------------------------------------------------------*
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108 * Initialization of decoder *
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109 *-----------------------------------------------------------------*/
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110
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111 synth = synth_buf + M;
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112
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113 reset_dec (); /* Bring the decoder and receive DTX to the initial state */
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114
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115 #if (WMOPS)
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116 Init_WMOPS_counter ();
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117 #endif
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118
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119 /*-----------------------------------------------------------------*
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120 * Loop for each "L_FRAME" speech data *
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121 *-----------------------------------------------------------------*/
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122
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123 frame = 0;
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124
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125 while (fread (serial, sizeof (Word16), 247, f_serial) == 247)
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126 {
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127 #if (WMOPS)
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128 fprintf (stderr, "frame=%d ", ++frame);
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129 #else
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130 fprintf (stderr, "\nframe=%d ", ++frame);
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131 #endif
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132
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133 #if (WMOPS)
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134 Reset_WMOPS_counter (); /* reset WMOPS counter for the new frame */
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135 #endif
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136
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137 SID_flag = serial[245]; /* Receive SID flag */
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138 TAF = serial[246]; /* Receive TAF flag */
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139
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140 Bits2prm_12k2 (serial, parm); /* serial to parameters */
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141
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142 #if (WMOPS)
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143 fwc (); /* function worst case */
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144 #endif
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145
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146 if (parm[0] == 0) /* BFI == 0, perform DHF check */
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147 {
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148 if (reset_flag_old == 1) /* Check for second and further
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149 successive DHF (to first subfr.) */
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150 {
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151 reset_flag = decoder_homing_frame_test (&parm[1],
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152 TO_FIRST_SUBFRAME);
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153 }
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154 else
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155 {
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156 reset_flag = 0;
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157 }
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158 }
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159 else /* BFI==1, bypass DHF check (frame
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160 is taken as not being a DHF) */
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161 {
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162 reset_flag = 0;
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163 }
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164
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165 if ((reset_flag != 0) && (reset_flag_old != 0))
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166 {
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167 /* Force the output to be the encoder homing frame pattern */
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168
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169 for (i = 0; i < L_FRAME; i++)
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170 {
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171 synth[i] = EHF_MASK;
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172 }
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173 }
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174 else
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175 {
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176 Decoder_12k2 (parm, synth, Az_dec, TAF, SID_flag);/* Synthesis */
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177
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178 Post_Filter (synth, Az_dec); /* Post-filter */
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179 #if (WMOPS)
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180 fwc (); /* function worst case */
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181 #endif
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182
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183 for (i = 0; i < L_FRAME; i++)
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184 /* Upscale the 15 bit linear PCM to 16 bits,
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185 then truncate to 13 bits */
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186 {
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187 temp = shl (synth[i], 1);
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188 synth[i] = temp & 0xfff8; logic16 (); move16 ();
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189 }
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190
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191 #if (WMOPS)
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192 fwc (); /* function worst case */
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193 #endif
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194
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195 #if (WMOPS)
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196 WMOPS_output (dtx_mode);/* output WMOPS values for current frame */
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197 #endif
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198 } /* else */
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199
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200 fwrite (synth, sizeof (Word16), L_FRAME, f_syn);
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201
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202 /* BFI == 0, perform check for first DHF (whole frame) */
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203 if ((parm[0] == 0) && (reset_flag_old == 0))
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204 {
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205 reset_flag = decoder_homing_frame_test (&parm[1], WHOLE_FRAME);
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diff changeset
206 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
207
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diff changeset
208 if (reset_flag != 0)
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209 {
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Mychaela Falconia <falcon@freecalypso.org>
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210 /* Bring the decoder and receive DTX to the home state */
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Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
211 reset_dec ();
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Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
212 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
213 reset_flag_old = reset_flag;
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214
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215 } /* while */
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Mychaela Falconia <falcon@freecalypso.org>
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216
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Mychaela Falconia <falcon@freecalypso.org>
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217 return 0;
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Mychaela Falconia <falcon@freecalypso.org>
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218 }