84 lines
2.5 KiB
C
84 lines
2.5 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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*
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* Copyright (C) 2002 Dave Chapman
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*
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* oss_sound - a sound driver for Linux (and others?) OSS audio
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*
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* All files in this archive are subject to the GNU General Public License.
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* See the file COPYING in the source tree root for full license agreement.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include <stdio.h>
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#include <fcntl.h>
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#include <linux/soundcard.h>
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#include "../common/sound.h"
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/* We want to use the "real" open in this file */
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#undef open
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int init_sound(sound_t* sound) {
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sound->fd=open("/dev/dsp", O_WRONLY);
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sound->freq=-1;
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sound->channels=-1;
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if (sound->fd <= 0) {
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fprintf(stderr,"Can not open /dev/dsp - simulating sound output\n");
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sound->fd=0;
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}
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}
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int config_sound(sound_t* sound, int sound_freq, int channels) {
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int format=AFMT_U16_LE;
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int setting=0x000C000D; // 12 fragments size 8kb ? WHAT IS THIS?
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sound->freq=sound_freq;
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sound->channels=channels;
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if (sound->fd) {
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if (ioctl(sound->fd,SNDCTL_DSP_SETFRAGMENT,&setting)==-1) {
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perror("SNDCTL_DSP_SETFRAGMENT");
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}
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if (ioctl(sound->fd,SNDCTL_DSP_CHANNELS,&channels)==-1) {
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perror("SNDCTL_DSP_STEREO");
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}
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if (channels==0) { fprintf(stderr,"Warning, only mono supported\n"); }
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if (ioctl(sound->fd,SNDCTL_DSP_SETFMT,&format)==-1) {
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perror("SNDCTL_DSP_SETFMT");
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}
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if (ioctl(sound->fd,SNDCTL_DSP_SPEED,&sound_freq)==-1) {
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perror("SNDCTL_DSP_SPEED");
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}
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}
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}
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int output_sound(sound_t* sound,const void* buf, int count) {
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unsigned long long t;
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if (sound->fd) {
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return(write(sound->fd,buf,count));
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} else {
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t=(unsigned int)(((unsigned int)(1000000/sound->channels)*count)/sound->freq);
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// fprintf(stderr,"writing %d bytes at %d frequency - sleeping for %u microseconds\n",count,sound->freq,t);
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usleep(t);
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return(count);
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}
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}
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void close_sound(sound_t* sound) {
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if (sound->fd) close(sound->fd);
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sound->fd=-1;
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}
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