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annotate amrconv/amr2efr.c @ 585:3c6bf0d26ee7 default tip

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TW-TS-005 reader: fix maximum line length bug TW-TS-005 section 4.1 states: The maximum allowed length of each line is 80 characters, not including the OS-specific newline encoding. The implementation of this line length limit in the TW-TS-005 hex file reader function in the present suite was wrong, such that lines of the full maximum length could not be read. Fix it. Note that this bug affects comment lines too, not just actual RTP payloads. Neither Annex A nor Annex B features an RTP payload format that goes to the maximum of 40 bytes, but if a comment line goes to the maximum allowed length of 80 characters not including the terminating newline, the bug will be triggered, necessitating the present fix.
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 25 Feb 2025 07:49:28 +0000
parents b092a510141e
children
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1 /*
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2 * Our gsm-amr2efr utility reads in a speech recording in .amr format
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3 * (the mode must be MR122 for every frame, no DTX) and converts it into
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4 * our ad hoc .gsmx format for EFR. The conversion is a bit reshuffling
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5 * only, no transcoding takes place.
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6 */
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7
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8 #include <stdio.h>
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9 #include <stdint.h>
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10 #include <stdlib.h>
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11 #include <string.h>
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12 #include <strings.h>
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13
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14 extern const uint8_t amr_122_bit_order[244];
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15
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16 static const char amr_file_hdr[] = "#!AMR\n";
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17
101
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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 char *infname, *outfname;
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22 FILE *inf, *outf;
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23 int wrong_flag, hdrb;
101
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24 uint8_t frm_in[31], frm_out[31];
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25 unsigned bit_a, bit_n;
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26
105
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27 if (argc == 3 && argv[1][0] != '-') {
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28 wrong_flag = 0;
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29 infname = argv[1];
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30 outfname = argv[2];
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31 } else if (argc == 4 && !strcmp(argv[1], "-w")) {
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32 wrong_flag = 1;
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33 infname = argv[2];
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34 outfname = argv[3];
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35 } else {
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36 fprintf(stderr, "usage: %s [-w] input.amr output.gsmx\n",
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37 argv[0]);
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38 exit(1);
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39 }
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40 inf = fopen(infname, "r");
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41 if (!inf) {
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42 perror(infname);
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43 exit(1);
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44 }
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45 if (fread(frm_in, 1, 6, inf) != 6 || bcmp(frm_in, amr_file_hdr, 6)) {
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46 fprintf(stderr, "error: %s is not in AMR format\n", 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 for (;;) {
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55 hdrb = getc(inf);
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56 if (hdrb < 0)
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57 break;
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58 if ((hdrb & 0x78) != 0x38) {
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59 fprintf(stderr, "error: unexpected content in %s\n",
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60 infname);
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61 exit(1);
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62 }
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63 if (fread(frm_in, 1, 31, inf) != 31) {
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64 fprintf(stderr, "error: short read from %s\n", infname);
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65 exit(1);
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66 }
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67 frm_out[0] = 0xC0;
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68 for (bit_a = 0; bit_a < 244; bit_a++) {
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69 if (wrong_flag)
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70 bit_n = bit_a;
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71 else
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72 bit_n = amr_122_bit_order[bit_a];
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73 msb_set_bit(frm_out, 4 + bit_n,
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74 msb_get_bit(frm_in, bit_a));
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75 }
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76 fwrite(frm_out, 1, 31, outf);
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77 }
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78 fclose(outf);
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79 exit(0);
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80 }