58 lines
1023 B
C
58 lines
1023 B
C
#include "vocal.h"
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int init_dsp( char *device ) {
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int dsp, arg;
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char *dev = (device == NULL ? "/dev/dsp" : device);
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if ((dsp=open( dev, O_RDONLY)) < 0) {
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perror("open of sound device failed");
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return -1;
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}
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arg = AFMT_U8;
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if (ioctl(dsp, SNDCTL_DSP_SETFMT, &arg)<0) {
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perror ("SNDCTL_DSP_SETFMT failed");
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return -1;
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}
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if (arg != AFMT_U8) {
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perror ("sound device doesn't support AFMT_U8");
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return -1;
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}
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arg = SIZE;
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if (ioctl(dsp, SOUND_PCM_WRITE_BITS, &arg) == -1) {
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perror("SOUND_PCM_WRITE_BITS ioctl failed");
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return -1;
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}
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if (arg != SIZE) {
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perror("unable to set sample size");
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return -1;
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}
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arg = CHANNELS;
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if (ioctl(dsp, SOUND_PCM_WRITE_CHANNELS, &arg) == -1) {
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perror("SOUND_PCM_WRITE_CHANNELS ioctl failed");
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return -1;
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}
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if (arg != CHANNELS) {
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perror("unable to set number of channels");
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return -1;
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}
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arg = RATE;
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if (ioctl(dsp, SOUND_PCM_WRITE_RATE, &arg) == -1) {
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perror("SOUND_PCM_WRITE_WRITE ioctl failed");
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return -1;
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}
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return dsp;
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}
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