FreeCalypso > hg > gsm-codec-lib

annotate miscutil/amr2efr.c @ 102:dd88f9312170

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gsm-amr2efr: forgot about AMR file header
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 27 Nov 2022 05:20:08 +0000
parents d86f866489e9
children ecfbced76fea
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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101
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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
102
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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 FILE *inf, *outf;
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22 int hdrb;
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23 uint8_t frm_in[31], frm_out[31];
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24 unsigned bit_a, bit_n;
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25
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26 if (argc != 3) {
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27 fprintf(stderr, "usage: %s input.amr output.gsmx\n", argv[0]);
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28 exit(1);
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29 }
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30 inf = fopen(argv[1], "r");
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31 if (!inf) {
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32 perror(argv[1]);
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33 exit(1);
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34 }
102
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35 if (fread(frm_in, 1, 6, inf) != 6 || bcmp(frm_in, amr_file_hdr, 6)) {
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36 fprintf(stderr, "error: %s is not in AMR format\n", argv[1]);
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37 exit(1);
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38 }
101
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39 outf = fopen(argv[2], "w");
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40 if (!outf) {
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41 perror(argv[2]);
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42 exit(1);
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43 }
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44 for (;;) {
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45 hdrb = getc(inf);
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46 if (hdrb < 0)
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47 break;
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48 if ((hdrb & 0x78) != 0x38) {
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49 fprintf(stderr, "error: unexpected content in %s\n",
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50 argv[1]);
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51 exit(1);
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52 }
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53 if (fread(frm_in, 1, 31, inf) != 31) {
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54 fprintf(stderr, "error: short read from %s\n", argv[1]);
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55 exit(1);
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56 }
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57 bzero(frm_out, 31);
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58 frm_out[0] = 0xC0;
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59 for (bit_a = 0; bit_a < 244; bit_a++) {
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60 bit_n = amr_122_bit_order[bit_a];
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61 msb_set_bit(frm_out, 4 + bit_n,
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62 msb_get_bit(frm_in, bit_a));
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63 }
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64 fwrite(frm_out, 1, 31, outf);
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65 }
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66 fclose(outf);
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67 exit(0);
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68 }