FreeCalypso > hg > gsm-codec-lib

annotate efrtest/rec2etsi.c @ 122:b33f2168fdec

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doc/EFR-rationale article written
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 10 Dec 2022 08:51:01 +0000
parents bd832a456339
children
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1 /*
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2 * This program reads in an EFR session recording in our binary format
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3 * (presumably obtained by converting from an RTP capture on the network
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4 * side or from a Calypso DSP readout on the mobile side) and converts
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5 * it into ETSI *.dec format, to be fed to ETSI decoder test program.
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6 *
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7 * The output from this program is in the local machine's native byte order.
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8 */
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9
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10 #include <stdio.h>
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11 #include <stdint.h>
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12 #include <stdlib.h>
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13 #include <string.h>
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14 #include <strings.h>
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15 #include "../libgsmefr/gsm_efr.h"
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16 #include "../libtest/binreader.h"
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17
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18 static void
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19 frame2bits(frame, bits)
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20 uint8_t *frame;
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21 uint16_t *bits;
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22 {
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23 unsigned nb, byte, mask, bit;
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24
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25 for (nb = 0; nb < 31; nb++) {
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26 byte = *frame++;
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27 for (mask = 0x80; mask; mask >>= 1) {
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28 if (byte & mask)
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29 bit = 1;
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30 else
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31 bit = 0;
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32 *bits++ = bit;
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33 }
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34 }
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35 }
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36
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37 main(argc, argv)
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38 char **argv;
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39 {
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40 FILE *binf, *outf;
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41 uint8_t frame[BINFILE_MAX_FRAME];
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42 uint16_t bits[250];
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43 int rc;
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44
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45 if (argc != 3) {
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46 fprintf(stderr, "usage: %s input.gsmx output.dec\n", argv[0]);
47
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47 exit(1);
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48 }
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49 binf = fopen(argv[1], "r");
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50 if (!binf) {
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51 perror(argv[1]);
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52 exit(1);
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53 }
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54 outf = fopen(argv[2], "w");
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55 if (!outf) {
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56 perror(argv[2]);
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57 exit(1);
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58 }
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59 for (;;) {
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60 rc = binfile_read_frame(binf, frame);
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61 if (rc < 0) {
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62 fprintf(stderr, "error: garbage in %s\n", argv[1]);
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63 exit(1);
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64 }
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65 if (!rc)
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66 break;
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67 if (frame[0] == 0xBF) {
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68 bits[3] = 1; /* BFI */
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69 bzero(bits + 4, 245 * 2);
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70 bits[249] = frame[1] & 1; /* TAF */
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71 } else if ((frame[0] & 0xF0) == 0xC0) {
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72 frame2bits(frame, bits);
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73 bits[248] = EFR_sid_classify(frame);
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74 bits[249] = 0; /* TAF */
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75 } else {
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76 fprintf(stderr,
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77 "error: %s is not in EFR codec format\n",
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78 argv[1]);
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79 exit(1);
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80 }
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81 fwrite(bits + 3, 2, 247, outf);
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82 }
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83 fclose(outf);
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84 exit(0);
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85 }