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/* osssound.c: OSS (e.g. Linux) sound I/O
Copyright (c) 2000-2004 Russell Marks, Matan Ziv-Av, Philip Kendall
$Id: osssound.c 3115 2007-08-19 02:49:14Z fredm $
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <config.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <sys/soundcard.h>
#include "settings.h"
#include "sound.h"
#include "spectrum.h"
#include "ui/ui.h"
/* using (8) 64 byte frags for 8kHz, scale up for higher */
#define BASE_SOUND_FRAG_PWR 6
static int soundfd=-1;
static int sixteenbit=1;
/* returns 0 on *success*, and adjusts freq/stereo args to reflect
* what we've actually got.
*/
int sound_lowlevel_init(const char *device,int *freqptr,int *stereoptr)
{
int frag,tmp,flags;
/* select a default device if we weren't explicitly given one */
if(device==NULL) device = "/dev/dsp";
/* Open the sound device non-blocking to avoid hangs if it is being
* used by something else, but then set it blocking again as that's what
* we actually want
*/
if((soundfd=open(device,O_WRONLY|O_NONBLOCK))==-1)
{
settings_current.sound = 0;
ui_error(UI_ERROR_ERROR,"couldn't open sound device '%s': %s",device,strerror(errno));
return 1;
}
if((flags=fcntl(soundfd,F_GETFL))==-1)
{
settings_current.sound = 0;
ui_error(UI_ERROR_ERROR,"couldn't get flags from sound device: %s",strerror(errno));
close(soundfd);
return 1;
}
flags &= ~O_NONBLOCK;
if(fcntl(soundfd,F_SETFL,flags)==-1)
{
settings_current.sound = 0;
ui_error(UI_ERROR_ERROR,"couldn't set sound device non-blocking: %s",strerror(errno));
close(soundfd);
return 1;
}
tmp=AFMT_S16_NE;
sixteenbit=1;
if(settings_current.sound_force_8bit || ioctl(soundfd,SNDCTL_DSP_SETFMT,&tmp)==-1)
{
/* try 8-bit - may be an 8-bit-only device */
tmp=AFMT_U8;
if((ioctl(soundfd,SNDCTL_DSP_SETFMT,&tmp))==-1)
{
settings_current.sound = 0;
ui_error(UI_ERROR_ERROR,"couldn't set sound device into 8-bit mode: %s",strerror(errno));
close(soundfd);
return 1;
}
sixteenbit=0;
}
/* XXX should it warn if it didn't get the stereoness it wanted? */
tmp=(*stereoptr)?1:0;
if(ioctl(soundfd,SNDCTL_DSP_STEREO,&tmp)<0)
{
/* if it failed, make sure the opposite is ok */
tmp=(*stereoptr)?0:1;
if(ioctl(soundfd,SNDCTL_DSP_STEREO,&tmp)<0)
{
settings_current.sound = 0;
ui_error(UI_ERROR_ERROR,"couldn't set sound device into either mono or stereo mode: %s",strerror(errno));
close(soundfd);
return 1;
}
*stereoptr=tmp;
}
frag=(0x80000|BASE_SOUND_FRAG_PWR);
if(ioctl(soundfd,SNDCTL_DSP_SPEED,freqptr)<0)
{
settings_current.sound = 0;
ui_error(UI_ERROR_ERROR,"couldn't set sound device speed to %d: %s",*freqptr, strerror(errno));
close(soundfd);
return 1;
}
if(*freqptr>8250) frag++;
if(*freqptr>16500) frag++;
if(*freqptr>33000) frag++;
if(*stereoptr) frag++;
if(sixteenbit) frag++;
/* FIXME: OSS API docs say you should write to the soundcard in frag size
blocks */
if(ioctl(soundfd,SNDCTL_DSP_SETFRAGMENT,&frag)<0)
{
settings_current.sound = 0;
ui_error(UI_ERROR_ERROR,"couldn't set sound device fragment size to %d: %s",frag,strerror(errno));
close(soundfd);
return 1;
}
return 0; /* success */
}
void sound_lowlevel_end(void)
{
if(soundfd!=-1)
close(soundfd);
}
void sound_lowlevel_frame(libspectrum_signed_word *data,int len)
{
static unsigned char buf8[4096];
unsigned char *data8=(unsigned char *)data;
int ret=0,ofs=0;
len<<=1; /* now in bytes */
if(!sixteenbit)
{
libspectrum_signed_word *src;
unsigned char *dst;
int f;
src=data; dst=buf8;
len>>=1;
for(f=0;f<len;f++)
*dst++=128+(int)((*src++)/256);
data8=buf8;
}
while(len)
{
ret=write(soundfd,data8+ofs,len);
if(ret>0)
ofs+=ret,len-=ret;
}
}
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