FreeCalypso > hg > gsm-codec-lib

annotate miscutil/raw2wav.c @ 183:452c1d5a6268

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libgsmefr BFI w/o data: emit zero output after decoder reset In real-life usage, each EFR decoder session will most likely begin with lots of BFI frames before the first real frame arrives. However, because the spec-defined home state of the decoder is speech rather than CN, our regular logic for BFI w/o data would have to feed pseudorandom noise to the decoder (in the "fixed codebook excitation pulses" part), which is silly to do at the beginning of the decoder session right out of reset. Therefore, let's check reset_flag_old, and if we are still in the reset state, simply emit zero output.
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 03 Jan 2023 00:12:18 +0000
parents c1dc094f0821
children
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c1dc094f0821 pcm16-raw2wav utility written
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1 /*
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2 * This program reads a 16-bit linear PCM speech recording in raw format
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3 * (either BE or LE) and converts it into WAV container format.
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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 "../libtest/wavwriter.h"
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12
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13 static void
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14 swap_bytes(bytes, cc)
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15 uint8_t *bytes;
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16 unsigned cc;
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17 {
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18 uint8_t *dp, *endp;
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19 int t;
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20
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21 dp = bytes;
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22 endp = bytes + cc;
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23 while (dp < endp) {
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24 t = dp[0];
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25 dp[0] = dp[1];
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26 dp[1] = t;
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27 dp += 2;
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28 }
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29 }
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30
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31 main(argc, argv)
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32 char **argv;
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33 {
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34 int big_endian;
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35 FILE *binf;
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36 void *wav;
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37 uint8_t bytes[320];
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38 int cc;
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39
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40 if (argc != 4) {
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41 usage: fprintf(stderr, "usage: %s be|le input.raw output.wav\n",
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42 argv[0]);
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43 exit(1);
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44 }
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45 if (!strcmp(argv[1], "be"))
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46 big_endian = 1;
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47 else if (!strcmp(argv[1], "le"))
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48 big_endian = 0;
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49 else
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50 goto usage;
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51 binf = fopen(argv[2], "r");
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52 if (!binf) {
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53 perror(argv[2]);
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54 exit(1);
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55 }
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56 wav = wav_write_open(argv[3], 8000, 16, 1);
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57 if (!wav) {
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58 perror(argv[3]);
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59 exit(1);
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60 }
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61 for (;;) {
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62 cc = fread(bytes, 1, sizeof bytes, binf);
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63 if (cc <= 0)
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64 break;
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65 if (cc & 1) {
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66 fprintf(stderr, "error: %s has odd number of bytes\n",
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67 argv[2]);
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68 exit(1);
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69 }
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70 if (big_endian)
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71 swap_bytes(bytes, cc);
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72 wav_write_data(wav, bytes, cc);
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73 }
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74 wav_write_close(wav);
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75 exit(0);
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76 }