FreeCalypso > hg > gsm-codec-lib

annotate efrtest/decode.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 d5bab777865a
children
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1 /*
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2 * This file is the main module for gsmefr-decode utility.
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3 */
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4
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5 #include <stdio.h>
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6 #include <stdint.h>
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7 #include <stdlib.h>
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8 #include "../libgsmefr/gsm_efr.h"
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9 #include "../libtest/binreader.h"
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10 #include "../libtest/wavwriter.h"
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11 #include "../libtest/pcmwrite.h"
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13 main(argc, argv)
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14 char **argv;
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15 {
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16 FILE *binf;
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17 void *wav;
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18 struct EFR_decoder_state *state;
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19 uint8_t frame[BINFILE_MAX_FRAME];
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20 int16_t pcm[160];
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21 int rc, bfi, taf;
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23 if (argc != 3) {
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24 fprintf(stderr, "usage: %s input.gsmx output.wav\n", argv[0]);
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25 exit(1);
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26 }
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27 binf = fopen(argv[1], "r");
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28 if (!binf) {
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29 perror(argv[1]);
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30 exit(1);
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31 }
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32 wav = wav_write_open(argv[2], 8000, 16, 1);
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33 if (!wav) {
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34 perror(argv[2]);
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35 exit(1);
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36 }
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37 state = EFR_decoder_create();
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38 if (!state) {
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39 perror("EFR_decoder_create()");
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40 exit(1);
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41 }
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42 for (;;) {
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43 rc = binfile_read_frame(binf, frame);
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44 if (rc < 0) {
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45 fprintf(stderr, "error: garbage in %s\n", argv[1]);
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46 exit(1);
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47 }
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48 if (!rc)
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49 break;
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50 if (frame[0] == 0xBF) {
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51 bfi = 1;
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52 taf = frame[1] & 1;
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53 } else if ((frame[0] & 0xF0) == 0xC0)
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54 bfi = 0;
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55 else {
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56 fprintf(stderr,
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57 "error: %s is not in EFR codec format\n",
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58 argv[1]);
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59 exit(1);
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60 }
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61 if (bfi)
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62 EFR_decode_bfi_nodata(state, taf, pcm);
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63 else
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64 EFR_decode_frame(state, frame, 0, 0, pcm);
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65 write_pcm_to_wav(wav, pcm);
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66 }
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67 wav_write_close(wav);
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68 exit(0);
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69 }