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annotate amrtest/decode.c @ 550:de333989a12b

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document gsm[e]fr-decode-tw5[-r] utilities
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 05 Oct 2024 02:16:48 +0000
parents fe4983b05230
children
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1 /*
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2 * twamr-decode is a speech decoder utility going from *.amr input
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3 * to WAV output. It logically replaces amrnb-dec from opencore-amr
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4 * package.
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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 "../libtwamr/tw_amr.h"
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13 #include "../libtest/wavwriter.h"
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14 #include "../libtest/pcmwrite.h"
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16 main(argc, argv)
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17 char **argv;
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18 {
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19 FILE *inf;
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20 void *wav;
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21 uint8_t frm_in[AMR_IETF_MAX_PL];
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22 struct amr_decoder_state *state;
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23 struct amr_param_frame frame;
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24 int16_t pcm[160];
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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 input.amr output.wav\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 if (fread(frm_in, 1, AMR_IETF_HDR_LEN, inf) != AMR_IETF_HDR_LEN ||
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37 bcmp(frm_in, amr_file_header_magic, AMR_IETF_HDR_LEN)) {
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38 fprintf(stderr, "error: %s is not in IETF AMR format\n",
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39 argv[1]);
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40 exit(1);
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41 }
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42 wav = wav_write_open(argv[2], 8000, 16, 1);
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43 if (!wav) {
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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 state = amr_decoder_create();
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48 if (!state) {
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49 perror("amr_decoder_create()");
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50 exit(1);
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51 }
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52 for (;;) {
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53 rc = getc(inf);
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54 if (rc < 0)
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55 break;
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56 frm_in[0] = rc;
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57 rc = amr_ietf_grok_first_octet(frm_in[0]);
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58 if (rc < 0) {
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59 inv: fprintf(stderr, "error: %s contains invalid AMR data\n",
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60 argv[1]);
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61 exit(1);
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62 }
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63 if (rc && fread(frm_in+1, 1, rc, inf) != rc)
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64 goto inv;
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65 amr_frame_from_ietf(frm_in, &frame);
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66 amr_decode_frame(state, &frame, pcm);
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67 write_pcm_to_wav(wav, pcm);
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68 }
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69 wav_write_close(wav);
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70 exit(0);
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71 }