FreeCalypso > hg > gsm-codec-lib

annotate amrconv/bwe2oa.c @ 599:762cf36e2487

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libgsmhr1/err_conc.[ch]: import original
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 04 Dec 2025 10:02:09 +0000
parents 2f1e91dd552b
children
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1 /*
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2 * This program reads a TW-TS-005 hexadecimal file, expects each record to be
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3 * AMR in BWE format, converts it to OA format, and writes the output into
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4 * a new TW-TS-005 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/tw5reader.h"
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13 #include "../libtest/tw5writer.h"
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14 #include "amr_defs.h"
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15
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16 extern const uint8_t pl_total_bytes_oa[9], pl_total_bytes_bwe[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 unsigned lineno;
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23 uint8_t frm_in[TWTS005_MAX_FRAME], frm_out[MAX_IF1_BYTES + 2];
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24 unsigned frm_in_len, cmr, ft, expect_len, out_len, n;
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25 int rc;
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26
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27 if (argc != 3) {
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28 fprintf(stderr, "usage: %s amr-bwe.hex amr-oa.hex\n", argv[0]);
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29 exit(1);
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30 }
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31 inf = fopen(argv[1], "r");
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32 if (!inf) {
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33 perror(argv[1]);
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34 exit(1);
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35 }
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36 lineno = 0;
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37 outf = fopen(argv[2], "w");
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38 if (!outf) {
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39 perror(argv[2]);
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40 exit(1);
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41 }
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42 for (;;) {
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43 rc = twts005_read_frame(inf, &lineno, frm_in, &frm_in_len);
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44 if (rc < 0) {
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45 fprintf(stderr, "%s line %u: not valid TW-TS-005\n",
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46 argv[1], lineno);
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47 exit(1);
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48 }
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49 if (!rc)
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50 break;
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51 if (frm_in_len == 0) {
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52 fputs("NULL\n", outf);
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53 continue;
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54 }
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55 if (frm_in_len < 2) {
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56 inv_payload: fprintf(stderr,
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57 "%s line %u: payload is not valid AMR BWE\n",
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58 argv[1], lineno);
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59 exit(1);
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60 }
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61 cmr = frm_in[0] >> 4;
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62 if (cmr > MR122 && cmr != MODE_NO_DATA)
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63 goto inv_payload;
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64 if (frm_in[0] & 0x08)
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65 goto inv_payload;
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66 ft = ((frm_in[0] & 0x07) << 1) | ((frm_in[1] & 0x80) >> 7);
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67 if (ft <= MRDTX)
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68 expect_len = pl_total_bytes_bwe[ft];
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69 else if (ft == MODE_NO_DATA)
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70 expect_len = 2;
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71 else
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72 goto inv_payload;
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73 if (frm_in_len != expect_len)
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74 goto inv_payload;
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75 /* With some frame types, the number of padding bits in OA
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76 * output will be greater than the number of padding bits in
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77 * BWE input. The easiest way to ensure zero fill in those bits
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78 * is to zero the byte just past the input. Because our frm_in
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79 * buffer is sized for TW-TS-005, we have room.
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80 */
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81 frm_in[expect_len] = 0;
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82 /* proceed to output */
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83 if (ft != MODE_NO_DATA)
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84 out_len = pl_total_bytes_oa[ft];
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85 else
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86 out_len = 2;
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87 frm_out[0] = cmr << 4;
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88 frm_out[1] = (ft << 3) | ((frm_in[1] & 0x40) >> 4);
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89 for (n = 2; n < out_len; n++)
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90 frm_out[n] = (frm_in[n-1] << 2) | (frm_in[n] >> 6);
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91 emit_hex_frame(outf, frm_out, out_len);
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92 }
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93 exit(0);
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94 }