FreeCalypso > hg > gsm-codec-lib

annotate efrtest/etsi-enc-common.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 51678b070c7a
children
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1 /*
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2 * This C module holds some functions that have been split off from
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3 * etsi-enc.c, with the goal of making it easier to build both
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4 * standard-EFR and AMR-EFR versions of the ETSI-format EFR encoder.
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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 <unistd.h>
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13 #include "../libgsmefr/gsm_efr.h"
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14
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15 read_input(inf, pcm, filename_for_errs, big_endian)
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16 FILE *inf;
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17 int16_t *pcm;
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18 char *filename_for_errs;
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19 {
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20 uint8_t file_bytes[320], *sp;
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21 int cc;
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22 unsigned n;
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23
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24 cc = fread(file_bytes, 2, 160, inf);
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25 if (cc == 0)
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26 return 0;
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27 if (cc != 160) {
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28 fprintf(stderr, "error: short read from %s\n",
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29 filename_for_errs);
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30 exit(1);
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31 }
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32 sp = file_bytes;
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33 for (n = 0; n < 160; n++) {
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34 if (big_endian)
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35 pcm[n] = (sp[0] << 8) | sp[1];
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36 else
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37 pcm[n] = sp[0] | (sp[1] << 8);
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38 sp += 2;
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39 }
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40 return 1;
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41 }
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42
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43 void
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44 frame2bits(frame, bits)
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45 uint8_t *frame, *bits;
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46 {
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47 unsigned nb, byte, mask, bit;
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48
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49 for (nb = 0; nb < EFR_RTP_FRAME_LEN; nb++) {
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50 byte = *frame++;
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51 for (mask = 0x80; mask; mask >>= 1) {
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52 if (byte & mask)
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53 bit = 1;
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54 else
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55 bit = 0;
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56 *bits++ = bit;
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57 }
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58 }
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59 }
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60
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61 void
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62 emit_output(outf, bits, nbits, big_endian)
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63 FILE *outf;
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64 uint8_t *bits;
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65 unsigned nbits;
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66 {
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67 unsigned n;
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69 for (n = 0; n < nbits; n++) {
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70 if (big_endian) {
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71 putc(0, outf);
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72 putc(bits[n], outf);
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73 } else {
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74 putc(bits[n], outf);
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75 putc(0, outf);
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76 }
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77 }
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78 }