FreeCalypso > hg > gsm-codec-lib

annotate frtest/max-out.c @ 183:452c1d5a6268

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libgsmefr BFI w/o data: emit zero output after decoder reset In real-life usage, each EFR decoder session will most likely begin with lots of BFI frames before the first real frame arrives. However, because the spec-defined home state of the decoder is speech rather than CN, our regular logic for BFI w/o data would have to feed pseudorandom noise to the decoder (in the "fixed codebook excitation pulses" part), which is silly to do at the beginning of the decoder session right out of reset. Therefore, let's check reset_flag_old, and if we are still in the reset state, simply emit zero output.
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 03 Jan 2023 00:12:18 +0000
parents a5ffec18e4cd
children
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1 /*
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2 * This program reads an extended-libgsm binary file (which must be in FR
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3 * codec format, not EFR) and performs the following processing, in this
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4 * order:
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5 *
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6 * 1) dumps every frame in human-readable form just like gsmrec-dump;
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7 * 2) passes the frame stream through our DTX Rx preprocessor;
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8 * 3) dumps the output from the preprocessor;
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9 * 4) feeds this output to the standard 06.10 decoder (libgsm);
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10 * 5) finds the highest-magnitude PCM sample in the decoder output and
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11 * reports this maximum output magnitude.
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12 *
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13 * This program is intended to serve as a debug aid, for troubleshooting
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14 * of our libgsmfrp+libgsm stack.
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15 */
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17 #include <stdio.h>
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18 #include <stdint.h>
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19 #include <stdlib.h>
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20 #include <gsm.h>
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21 #include "../libgsmfrp/gsm_fr_preproc.h"
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22 #include "../libtest/binreader.h"
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24 main(argc, argv)
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25 char **argv;
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26 {
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27 FILE *binf;
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28 gsm dec_state;
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29 struct gsmfr_preproc_state *pp_state;
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30 unsigned frame_index;
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31 uint8_t frame[BINFILE_MAX_FRAME];
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32 int16_t pcm[160];
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33 gsm_signal fr_params[76];
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34 int rc, bfi, taf;
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35 int i, j, n;
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36 unsigned samp_abs, samp_max;
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37
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38 if (argc != 2) {
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39 fprintf(stderr, "usage: %s bin-stream-file\n", argv[0]);
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40 exit(1);
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41 }
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42 binf = fopen(argv[1], "r");
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43 if (!binf) {
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44 perror(argv[1]);
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45 exit(1);
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46 }
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47 dec_state = gsm_create();
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48 if (!dec_state) {
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49 fprintf(stderr, "gsm_create() failed!\n");
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50 exit(1);
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51 }
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52 pp_state = gsmfr_preproc_create();
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53 if (!pp_state) {
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54 fprintf(stderr, "gsmfr_preproc_create() failed!\n");
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55 exit(1);
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56 }
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57 for (frame_index = 0; ; frame_index++) {
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58 rc = binfile_read_frame(binf, frame);
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59 if (rc < 0) {
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60 fprintf(stderr, "error: garbage in %s\n", argv[1]);
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61 exit(1);
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62 }
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63 if (!rc)
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64 break;
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65 printf("#%u: ", frame_index);
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66 switch (frame[0] & 0xF0) {
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67 case 0xB0:
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68 bfi = 1;
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69 taf = frame[1] & 1;
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70 printf("BFI TAF=%u\n", taf);
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71 break;
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72 case 0xD0:
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73 bfi = 0;
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74 fputs("FR", stdout);
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75 gsm_explode(dec_state, frame, fr_params);
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76 n = 0;
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77 for (i = 0; i < 8; i++)
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78 printf(" %d", fr_params[n++]);
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79 putchar('\n');
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80 for (i = 0; i < 4; i++) {
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81 putchar(' ');
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82 for (j = 0; j < 17; j++)
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83 printf(" %d", fr_params[n++]);
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84 putchar('\n');
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85 }
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86 break;
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87 default:
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88 fprintf(stderr, "error: %s is not in FR codec format\n",
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89 argv[1]);
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90 exit(1);
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91 }
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92 if (bfi)
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93 gsmfr_preproc_bfi(pp_state, taf, frame);
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94 else
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95 gsmfr_preproc_good_frame(pp_state, frame);
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96 fputs("Xform:", stdout);
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97 gsm_explode(dec_state, frame, fr_params);
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98 n = 0;
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99 for (i = 0; i < 8; i++)
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100 printf(" %d", fr_params[n++]);
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101 putchar('\n');
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102 for (i = 0; i < 4; i++) {
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103 putchar(' ');
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104 for (j = 0; j < 17; j++)
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105 printf(" %d", fr_params[n++]);
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106 putchar('\n');
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107 }
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108 gsm_decode(dec_state, frame, pcm);
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109 samp_max = 0;
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110 for (i = 0; i < 160; i++) {
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111 if (pcm[i] >= 0)
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112 samp_abs = pcm[i];
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113 else
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114 samp_abs = -pcm[i];
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115 if (samp_abs > samp_max)
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116 samp_max = samp_abs;
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117 }
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118 printf(" MAX=%u\n", samp_max);
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119 }
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120 exit(0);
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121 }