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annotate amrconv/cod-parse.c @ 237:e4a4bf11f37c

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doc/PCM8-conversions: document command line utilities
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 08 May 2023 04:29:05 +0000
parents 0beafaa0623f
children
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1 /*
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2 * This program reads an ETSI/3GPP AMR *.cod file and parses it into
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3 * a human-readable form.
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4 */
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5
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6 #include <stdio.h>
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7 #include <stdint.h>
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8 #include <stdlib.h>
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9 #include <string.h>
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10 #include <strings.h>
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11 #include "amr_defs.h"
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12
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13 extern char *amr_mode_names[16];
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14 extern unsigned amr_bit_lengths[9];
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15
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16 static char *type_names[4] = {
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17 "Speech",
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18 "SID_FIRST",
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19 "SID_UPDATE",
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20 "NO_DATA"
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21 };
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23 main(argc, argv)
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24 char **argv;
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25 {
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26 char *infname;
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27 FILE *inf;
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28 int big_endian;
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29 unsigned frame_no, type, mode;
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30 uint8_t input_bits[COD_FORMAT_NWORDS];
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31 uint16_t params[MAX_PRM_SIZE];
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32 int rc;
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33
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34 if (argc == 2 && argv[1][0] != '-') {
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35 big_endian = 0;
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36 infname = argv[1];
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37 } else if (argc == 3 && !strcmp(argv[1], "-b")) {
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38 big_endian = 1;
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39 infname = argv[2];
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40 } else {
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41 fprintf(stderr, "usage: %s [-b] file.cod\n", argv[0]);
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42 exit(1);
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43 }
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44 inf = fopen(infname, "r");
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45 if (!inf) {
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46 perror(infname);
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47 exit(1);
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48 }
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49 for (frame_no = 0; ; frame_no++) {
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50 rc = read_cod_bits(inf, big_endian, input_bits, infname);
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51 if (!rc)
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52 break;
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53 type = input_bits[0];
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54 mode = input_bits[245];
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55 printf("#%u: Type=%u Mode=%u", frame_no, type, mode);
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56 if (type == TX_NO_DATA) {
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57 printf(" (NO_DATA)\n");
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58 continue;
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59 }
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60 if (type > TX_NO_DATA || mode > MR122) {
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61 printf(" (unsupported)\n");
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62 continue;
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63 }
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64 printf(" (%s %s)\n", amr_mode_names[mode], type_names[type]);
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65 switch (type) {
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66 case TX_SPEECH_GOOD:
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67 preen_frame_bits(input_bits+1, amr_bit_lengths[mode],
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68 infname, frame_no);
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69 reassemble_amr_params(input_bits+1, params, mode);
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70 dump_amr_params(params, mode);
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71 break;
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72 case TX_SID_FIRST:
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73 case TX_SID_UPDATE:
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74 preen_frame_bits(input_bits+1, AMR_NBITS_SID, infname,
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75 frame_no);
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76 reassemble_amr_params(input_bits+1, params, MRDTX);
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77 dump_amr_params(params, MRDTX);
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78 break;
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79 }
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80 }
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81 exit(0);
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82 }