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annotate oss_audio.c @ 4:c8875256b767

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Use stdio for console output, update usage, and use sensible exit values.
author Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
date Tue, 21 May 2013 12:10:27 +0200
parents c55ea9478c80
children
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c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
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1 #if !defined(WIN32) && !defined(WIN64)
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2 #include <stdint.h>
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3 #include <fcntl.h>
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4 #include <unistd.h>
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5 #include <sys/stat.h>
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6 #include <sys/soundcard.h>
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7 #include <sys/ioctl.h>
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8
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9 int oss_audio_open(uint32_t oss_audio_rate, uint8_t nchannels)
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10 {
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11 int afd = -1, tmp = 0;
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12
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13 /* open the sound device */
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14 if ((afd = open("/dev/dsp", O_WRONLY, 0)) == -1)
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15 { /* Opening device failed */
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16 return(-2);
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17 }
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18
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19 tmp = AFMT_S16_NE;
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20 /* set the sound driver audio format for playback */
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21 if (ioctl(afd, SNDCTL_DSP_SETFMT, &tmp) == -1)
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22 { /* Fatal error */
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23 goto err;
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24 }
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25
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26 /* set the sound driver number of channels for playback */
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27 tmp = (nchannels-1);
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28 if (ioctl(afd, SNDCTL_DSP_STEREO, &tmp) == -1)
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29 { /* Fatal error */
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30 goto err;
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31 }
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32
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33 /* set the sound driver number playback rate */
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34 tmp = oss_audio_rate;
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35 if (ioctl(afd, SNDCTL_DSP_SPEED, &tmp) == -1)
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36 { /* Fatal error */
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37 goto err;
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38 }
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39
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40 return afd;
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41 err:
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42 close(afd);
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43 return(-1);
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44 }
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45 #endif
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46