75 lines
2.2 KiB
C
75 lines
2.2 KiB
C
/***************************************************************************
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, write to the *
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* Free Software Foundation, Inc., *
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
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***************************************************************************/
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#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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