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annotate amrconv/ietf-parse.c @ 287:f00925b533b7

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gsmfr-encode: convert to libgsmfr2
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 14 Apr 2024 06:16:47 +0000
parents 934cf92a1c45
children
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214
934cf92a1c45 amrconv: new program amr-ietf-parse
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
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2 * This program reads an AMR recording in IETF RFC 4867 format and parses it
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3 * into a human-readable form.
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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 <string.h>
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10 #include <strings.h>
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11 #include "amr_defs.h"
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12
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13 extern char *amr_mode_names[16];
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14 extern const char amr_file_hdr[IETF_HDR_LEN];
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15 extern const uint8_t extra_bytes_per_ft[9];
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16
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17 main(argc, argv)
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18 char **argv;
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19 {
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20 char *infname;
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21 FILE *inf;
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22 uint8_t frm_in[MAX_IF1_BYTES];
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23 unsigned frame_no, mode, qbit, sti, sid_mode;
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24 uint8_t ser_bits[MAX_SERIAL_SIZE];
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25 uint16_t params[MAX_PRM_SIZE];
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26 int rc;
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27
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28 if (argc != 2) {
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29 fprintf(stderr, "usage: %s amr_file\n", argv[0]);
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30 exit(1);
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31 }
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32 infname = argv[1];
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33 inf = fopen(infname, "r");
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34 if (!inf) {
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35 perror(infname);
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36 exit(1);
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37 }
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38 if (fread(frm_in, 1, IETF_HDR_LEN, inf) != IETF_HDR_LEN ||
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39 bcmp(frm_in, amr_file_hdr, IETF_HDR_LEN)) {
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40 fprintf(stderr, "error: %s is not in IETF AMR format\n",
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41 infname);
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42 exit(1);
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43 }
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44 for (frame_no = 0; ; frame_no++) {
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45 rc = getc(inf);
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46 if (rc < 0)
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47 break;
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48 mode = (rc & 0x78) >> 3;
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49 qbit = (rc & 4) >> 2;
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50 printf("#%u: FT=%u (%s) Q=%u\n", frame_no, mode,
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51 amr_mode_names[mode], qbit);
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52 if (mode == MODE_NO_DATA)
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53 continue;
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54 if (mode > MRDTX) {
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55 fprintf(stderr, "error in frame #%u: invalid FT=%u\n",
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56 frame_no, mode);
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57 exit(1);
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58 }
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59 rc = fread(frm_in, 1, extra_bytes_per_ft[mode], inf);
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60 if (rc != extra_bytes_per_ft[mode]) {
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61 fprintf(stderr,
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62 "error: short read from %s on frame #%u\n",
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63 infname, frame_no);
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64 exit(1);
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65 }
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66 amr_if1_unpack(frm_in, ser_bits, mode);
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67 reassemble_amr_params(ser_bits, params, mode);
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68 dump_amr_params(params, mode);
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69 if (mode == MRDTX) {
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70 sti = (frm_in[4] & 0x10) >> 4;
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71 sid_mode = 0;
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72 if (frm_in[4] & 0x08)
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73 sid_mode |= 1;
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74 if (frm_in[4] & 0x04)
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75 sid_mode |= 2;
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76 if (frm_in[4] & 0x02)
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77 sid_mode |= 4;
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78 printf(" SID_%s Mode=%u\n", sti ? "UPDATE" : "FIRST",
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79 sid_mode);
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80 }
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81 }
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82 exit(0);
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83 }