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annotate libtest/wavrdhelp.c @ 485:751f06541fbb

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doc/Codec-utils: clarify lack of DHF in gsmfr-decode-rb
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 20 May 2024 01:47:22 +0000
parents 30d1d0a705c0
children
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13
30d1d0a705c0 libtest: add WAV reader helper functions
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1 /*
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2 * In this module we implement our helper functions
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3 * on top of the basic WAV reader.
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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 "wavreader.h"
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9 #include "wavrdhelp.h"
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10
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11 int wavrd_check_header(void *wav, const char *filename)
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12 {
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13 int format, sampleRate, channels, bitsPerSample;
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14
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15 if (!wav_get_header(wav, &format, &channels, &sampleRate,
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16 &bitsPerSample, NULL)) {
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17 fprintf(stderr, "error: %s is not a valid WAV file\n",
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18 filename);
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19 return -1;
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20 }
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21 if (format != 1) {
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22 fprintf(stderr, "error: %s has unsupported WAV format %d\n",
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23 filename, format);
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24 return -1;
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25 }
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26 if (bitsPerSample != 16) {
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27 fprintf(stderr,
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28 "error: %s has unsupported WAV sample depth %d\n",
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29 filename, bitsPerSample);
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30 return -1;
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31 }
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32 if (channels != 1) {
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33 fprintf(stderr, "error: %s has %d channels, need 1\n",
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34 filename, channels);
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35 return -1;
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36 }
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37 if (sampleRate != 8000) {
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38 fprintf(stderr,
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39 "error: %s has %d Hz sample rate, need 8000 Hz\n",
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40 filename, sampleRate);
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41 return -1;
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42 }
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43 return 0;
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44 }
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45
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46 int wavrd_get_pcm_block(void *wav, int16_t *pcm)
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47 {
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48 uint8_t bytes[320], *dp;
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49 int cc, i;
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50
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51 cc = wav_read_data(wav, bytes, 320);
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52 cc >>= 1;
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53 dp = bytes;
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54 for (i = 0; i < cc; i++) {
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55 pcm[i] = dp[0] | (dp[1] << 8);
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56 dp += 2;
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57 }
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58 while (i < 160)
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59 pcm[i++] = 0;
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60 return cc;
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61 }