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annotate amrefr/tseq-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 3eadaef8b28f
children
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1 /*
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2 * amrefr-tseq-dec is a test program for our libtwamr-based "alternative EFR"
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3 * decoder: it functions just like gsmefr-etsi-dec, but uses libtwamr as
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4 * the decoder engine instead of libgsmefr. Libgsmefr functions are still
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5 * used for frame unpacking, but not for actual decoding. Note that there is
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6 * no DTX support in this version, and the *.dec test sequence being decoded
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7 * must have SID=0 in every frame. As a simplification, we also require BFI=0:
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8 * while it is possible to feed BFI=1 frames to libtwamr decoder (convert to
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9 * RX_SPEECH_BAD), such support is not needed for decoding the test sequences
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10 * in amr122_efr.zip, hence we've omitted it for simplicity.
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11 *
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12 * The byte order is LE by default or BE with -b option.
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13 */
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14
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15 #include <stdio.h>
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16 #include <stdint.h>
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17 #include <stdlib.h>
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18 #include <string.h>
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19 #include <strings.h>
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20 #include "../libgsmefr/gsm_efr.h"
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21 #include "../libtwamr/tw_amr.h"
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22 #include "../efrtest/etsi.h"
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23
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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 int big_endian;
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28 char *infname, *outfname;
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29 FILE *inf, *outf;
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30 struct amr_decoder_state *state;
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31 unsigned frame_no;
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32 uint8_t input_bits[ETSI_DEC_NWORDS], efr_frame[EFR_RTP_FRAME_LEN];
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33 struct amr_param_frame amr_frame;
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34 int16_t pcm[160];
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35 int rc;
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36
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37 if (argc == 3 && argv[1][0] != '-') {
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38 big_endian = 0;
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39 infname = argv[1];
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40 outfname = argv[2];
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41 } else if (argc == 4 && !strcmp(argv[1], "-b")) {
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42 big_endian = 1;
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43 infname = argv[2];
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44 outfname = argv[3];
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45 } else {
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46 fprintf(stderr, "usage: %s [-b] input.dec output.out\n",
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47 argv[0]);
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48 exit(1);
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49 }
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50 inf = fopen(infname, "r");
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51 if (!inf) {
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52 perror(infname);
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53 exit(1);
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54 }
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55 outf = fopen(outfname, "w");
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56 if (!outf) {
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57 perror(outfname);
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58 exit(1);
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59 }
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60 state = amr_decoder_create();
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61 if (!state) {
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62 perror("amr_decoder_create()");
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63 exit(1);
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64 }
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65 amr_frame.type = RX_SPEECH_GOOD;
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66 amr_frame.mode = 0x87;
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67 for (frame_no = 0; ; frame_no++) {
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68 rc = read_etsi_bits(inf, big_endian, input_bits,
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69 ETSI_DEC_NWORDS, infname);
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70 if (!rc)
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71 break;
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72 if (input_bits[0]) {
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73 fprintf(stderr,
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74 "error in %s frame #%u: BFI != 0 not supported\n",
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75 infname, frame_no);
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76 exit(1);
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77 }
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78 bits2frame(input_bits + 1, efr_frame, infname, frame_no);
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79 if (input_bits[245]) {
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80 fprintf(stderr,
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81 "error in %s frame #%u: SID != 0 not supported\n",
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82 infname, frame_no);
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83 exit(1);
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84 }
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85 EFR_frame2params(efr_frame, amr_frame.param);
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86 amr_decode_frame(state, &amr_frame, pcm);
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87 if (big_endian)
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88 write_pcm_be(outf, pcm);
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89 else
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90 write_pcm_le(outf, pcm);
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91 }
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92 fclose(outf);
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93 exit(0);
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94 }