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annotate efrtest/etsi-dec.c @ 550:de333989a12b

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document gsm[e]fr-decode-tw5[-r] utilities
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 05 Oct 2024 02:16:48 +0000
parents 9f354d2aea13
children
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1 /*
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2 * gsmefr-etsi-dec is a test program for our EFR decoder: it reads ETSI's
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3 * .dec format as input and writes raw 16-bit PCM (same as ETSI's *.out)
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4 * as output, allowing our decoder to be tested with ETSI's official test
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5 * sequences.
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6 *
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7 * ETSI input and output files are read and written in LE byte order
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8 * by default, or in BE byte order if -b option is given.
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9 */
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10
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11 #include <stdio.h>
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12 #include <stdint.h>
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13 #include <stdlib.h>
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14 #include <string.h>
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15 #include <strings.h>
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16 #include "../libgsmefr/gsm_efr.h"
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17 #include "etsi.h"
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18
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19 main(argc, argv)
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20 char **argv;
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21 {
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22 int big_endian;
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23 char *infname, *outfname;
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24 FILE *inf, *outf;
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25 struct EFR_decoder_state *state;
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26 unsigned frame_no;
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27 uint8_t input_bits[ETSI_DEC_NWORDS], frame[EFR_RTP_FRAME_LEN];
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28 int16_t pcm[160];
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29 int rc;
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30
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31 if (argc == 3 && argv[1][0] != '-') {
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32 big_endian = 0;
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33 infname = argv[1];
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34 outfname = argv[2];
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35 } else if (argc == 4 && !strcmp(argv[1], "-b")) {
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36 big_endian = 1;
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37 infname = argv[2];
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38 outfname = argv[3];
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39 } else {
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40 fprintf(stderr, "usage: %s [-b] input.dec output.out\n",
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41 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 outf = fopen(outfname, "w");
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50 if (!outf) {
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51 perror(outfname);
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52 exit(1);
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53 }
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54 state = EFR_decoder_create();
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55 if (!state) {
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56 perror("EFR_decoder_create()");
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57 exit(1);
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58 }
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59 for (frame_no = 0; ; frame_no++) {
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60 rc = read_etsi_bits(inf, big_endian, input_bits,
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61 ETSI_DEC_NWORDS, infname);
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62 if (!rc)
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63 break;
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64 if (input_bits[0] > 1) {
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65 fprintf(stderr, "error in %s frame #%u: BFI > 1\n",
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66 infname, frame_no);
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67 exit(1);
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68 }
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69 bits2frame(input_bits + 1, frame, infname, frame_no);
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70 if (input_bits[245] > 2) {
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71 fprintf(stderr, "error in %s frame #%u: SID > 2\n",
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72 infname, frame_no);
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73 exit(1);
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74 }
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75 if (input_bits[246] > 1) {
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76 fprintf(stderr, "error in %s frame #%u: TAF > 1\n",
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77 infname, frame_no);
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78 exit(1);
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79 }
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80 rc = EFR_sid_classify(frame);
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81 if (input_bits[245] != rc) {
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82 fprintf(stderr,
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83 "warning: frame #%u has mismatching SID (file says %u, analysis yields %d)\n",
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84 frame_no, input_bits[245], rc);
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85 }
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86 EFR_decode_frame(state, frame, input_bits[0], input_bits[246],
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87 pcm);
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88 if (big_endian)
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89 write_pcm_be(outf, pcm);
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90 else
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91 write_pcm_le(outf, pcm);
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92 }
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93 fclose(outf);
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94 exit(0);
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95 }