FreeCalypso > hg > gsm-codec-lib

annotate frtest/decode-r.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 cfa3006a66da
children
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1 /*
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2 * gsmfr-decode-r is like gsmfr-decode, but writes the decoded PCM
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3 * output in our "robe" format instead of WAV.
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4 */
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5
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6 #include <stdio.h>
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7 #include <stdint.h>
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8 #include <stdlib.h>
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9 #include "../libgsmfr2/tw_gsmfr.h"
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10 #include "../libtest/binreader.h"
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11 #include "../libtest/robewrite.h"
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13 main(argc, argv)
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14 char **argv;
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15 {
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16 FILE *binf, *outf;
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17 struct gsmfr_fulldec_state *fd_state;
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18 uint8_t frame[BINFILE_MAX_FRAME];
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19 int16_t pcm[160];
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20 int rc, bfi, taf;
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22 if (argc != 3) {
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23 fprintf(stderr, "usage: %s input.gsm output.robe\n", argv[0]);
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24 exit(1);
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25 }
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26 binf = fopen(argv[1], "r");
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27 if (!binf) {
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28 perror(argv[1]);
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29 exit(1);
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30 }
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31 outf = fopen(argv[2], "w");
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32 if (!outf) {
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33 perror(argv[2]);
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34 exit(1);
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35 }
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36 fd_state = gsmfr_fulldec_create();
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37 if (!fd_state) {
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38 fprintf(stderr, "gsmfr_fulldec_create() failed!\n");
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39 exit(1);
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40 }
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41 for (;;) {
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42 rc = binfile_read_frame(binf, frame);
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43 if (rc < 0) {
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44 fprintf(stderr, "error: garbage in %s\n", argv[1]);
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45 exit(1);
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46 }
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47 if (!rc)
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48 break;
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49 if (frame[0] == 0xBF) {
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50 bfi = 1;
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51 taf = frame[1] & 1;
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52 } else if ((frame[0] & 0xF0) == 0xD0)
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53 bfi = 0;
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54 else {
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55 fprintf(stderr, "error: %s is not in FR codec format\n",
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56 argv[1]);
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57 exit(1);
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58 }
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59 if (bfi)
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60 gsmfr_fulldec_bfi(fd_state, taf, pcm);
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61 else
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62 gsmfr_fulldec_good_frame(fd_state, frame, pcm);
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63 write_pcm_to_robe(outf, pcm);
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64 }
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65 fclose(outf);
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66 exit(0);
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67 }