FreeCalypso > hg > gsm-codec-lib
annotate libtest/wavrdhelp.c @ 15:851ca64e38e9
rtp-gsmfr-extr program written, compiles
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sun, 20 Nov 2022 04:15:44 +0000 |
parents | 30d1d0a705c0 |
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rev | line source |
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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 } |