FreeCalypso > hg > gsm-codec-lib

annotate efrtest/dlcap-dec.c @ 478:936a08cc73ce

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doc/AMR-library-API: describe the decoder
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 19 May 2024 21:32:31 +0000
parents 5f23cb3f0f8d
children
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1 /*
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2 * This program reads a TCH/EFS downlink capture produced with FreeCalypso tools
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3 * (fw version with TCH downlink sniffing feature and fc-shell tch record)
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4 * and feeds it to our libgsmefr decoder, making our best attempt to
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5 * replicate the processing steps that must be performed by the original DSP.
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6 *
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7 * The output format is "robe" (raw big-endian).
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8 */
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10 #include <ctype.h>
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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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18 main(argc, argv)
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19 char **argv;
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20 {
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21 FILE *inf, *outf;
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22 struct EFR_decoder_state *state;
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23 char linebuf[128];
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24 int lineno, rc;
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25 uint16_t status_words[3];
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26 uint8_t tidsp_bytes[33], frame[EFR_RTP_FRAME_LEN];
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27 int16_t params[EFR_NUM_PARAMS], pcm[160];
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28 unsigned fn_mod_104;
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29 int bfi, taf, sid;
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31 if (argc != 3) {
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32 fprintf(stderr, "usage: %s infile outfile\n", argv[0]);
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33 exit(1);
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34 }
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35 inf = fopen(argv[1], "r");
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36 if (!inf) {
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37 perror(argv[1]);
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38 exit(1);
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39 }
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40 outf = fopen(argv[2], "w");
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41 if (!outf) {
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42 perror(argv[2]);
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43 exit(1);
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44 }
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45 state = EFR_decoder_create();
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46 if (!state) {
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47 perror("EFR_decoder_create()");
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48 exit(1);
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49 }
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50 for (lineno = 1; fgets(linebuf, sizeof linebuf, inf); lineno++) {
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51 /* support both old and new formats */
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52 if (isxdigit(linebuf[0]) && isxdigit(linebuf[1]) &&
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53 isxdigit(linebuf[2]) && isxdigit(linebuf[3])) {
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54 rc = parse_dlcap_common(linebuf, status_words,
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55 tidsp_bytes);
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56 if (rc < 0) {
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57 invalid: fprintf(stderr,
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58 "error: %s is not in the expected format\n",
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59 argv[1]);
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60 exit(1);
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61 }
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62 fn_mod_104 = 0; /* won't have TAF */
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63 } else if (!strncmp(linebuf, "EFR ", 4)) {
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64 rc = parse_dlcap_common(linebuf + 4, status_words,
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65 tidsp_bytes);
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66 if (rc < 0)
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67 goto invalid;
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68 if (linebuf[85] != ' ')
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69 goto invalid;
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70 if (!isdigit(linebuf[86]))
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71 goto invalid;
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72 fn_mod_104 = strtoul(linebuf + 86, 0, 10);
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73 } else
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74 goto invalid;
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75 /* processing, hoping to replicate what the DSP does */
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76 efr_tidsp_to_std(tidsp_bytes, frame);
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77 EFR_frame2params(frame, params);
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78 bfi = (status_words[0] & 0x0204) != 0;
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79 sid = (status_words[0] & 0x0018) >> 3;
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80 taf = fn_mod_104 == 60;
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81 EFR_decode_params(state, params, bfi, sid, taf, pcm);
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82 write_pcm_to_robe(outf, pcm);
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83 }
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84 exit(0);
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85 }