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annotate amrconv/ietf2hex.c @ 605:63f774192906

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gsmhr_decoder_twts002_in(): set BFI=1 SID=1 for invalid SID When a received TW-TS-002 RTP payload indicates invalid SID, which of the 3 possible BFI/SID combinations should we pass to our internal ETSI-based speech decoder or TFO engine? Our original code passed BFI=0 SID=1, but upon further reflection, BFI=1 SID=1 is a better choice. In the corner case where received invalid SID is fed to a full decoder in homed state, setting BFI=1 allows that decoder to emit zeros on PCM and stay homed, instead of launching into full decoding.
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 04 Dec 2025 21:01:46 +0000
parents e414d138c607
children
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1 /*
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2 * This program reads an AMR speech recording in RFC 4867 binary storage format,
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3 * converts each frame to an octet-aligned RTP payload (adds CMR octet), and
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4 * writes out these payloads as a TW-TS-005 Annex C hex file.
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5 */
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6
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7 #include <stdio.h>
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8 #include <stdint.h>
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9 #include <stdlib.h>
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10 #include <string.h>
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11 #include <strings.h>
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12 #include "../libtest/tw5writer.h"
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13 #include "amr_defs.h"
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15 extern const char amr_file_hdr[IETF_HDR_LEN];
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16 extern const uint8_t extra_bytes_per_ft[9];
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17
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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 uint8_t frame[MAX_IF1_BYTES + 2];
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23 unsigned frame_no, ft, frame_len;
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24 int rc;
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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.hex\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 }
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35 if (fread(frame, 1, IETF_HDR_LEN, inf) != IETF_HDR_LEN ||
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36 bcmp(frame, amr_file_hdr, IETF_HDR_LEN)) {
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37 fprintf(stderr, "error: %s is not in IETF AMR format\n",
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38 argv[1]);
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39 exit(1);
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40 }
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41 if (strcmp(argv[2], "-")) {
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42 outf = fopen(argv[2], "w");
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43 if (!outf) {
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44 perror(argv[2]);
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45 exit(1);
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46 }
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47 } else
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48 outf = stdout;
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49 frame[0] = 0xF0;
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50 for (frame_no = 0; ; frame_no++) {
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51 rc = getc(inf);
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52 if (rc < 0)
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53 break;
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54 frame[1] = rc & 0x7C;
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55 ft = frame[1] >> 3;
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56 frame_len = 2;
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57 if (ft != MODE_NO_DATA) {
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58 if (ft > MRDTX) {
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59 fprintf(stderr,
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60 "error in frame #%u: invalid FT=%u\n",
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61 frame_no, ft);
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62 exit(1);
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63 }
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64 rc = fread(frame + 2, 1, extra_bytes_per_ft[ft], inf);
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65 if (rc != extra_bytes_per_ft[ft]) {
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66 fprintf(stderr,
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67 "error: short read from %s on frame #%u\n",
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68 argv[1], frame_no);
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69 exit(1);
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70 }
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71 frame_len += extra_bytes_per_ft[ft];
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72 }
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73 emit_hex_frame(outf, frame, frame_len);
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74 }
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75 exit(0);
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76 }