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/***************************************************************************
oss.c - description
-------------------
begin : Wed May 15 2002
copyright : (C) 2002 by Pete Bernert
email : BlackDove@addcom.de
***************************************************************************/
/***************************************************************************
* *
* 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. See also the license.txt file for *
* additional informations. *
* *
***************************************************************************/
#include "stdafx.h"
#define _IN_OSS
#include "externals.h"
////////////////////////////////////////////////////////////////////////
// oss globals
////////////////////////////////////////////////////////////////////////
#define OSS_MODE_STEREO 1
#define OSS_MODE_MONO 0
#define OSS_SPEED_44100 44100
static int oss_audio_fd = -1;
extern int errno;
////////////////////////////////////////////////////////////////////////
// SETUP SOUND
////////////////////////////////////////////////////////////////////////
void SetupSound(void)
{
int pspeed=44100;
int pstereo;
int format;
int fragsize = 0;
int myfrag;
int oss_speed, oss_stereo;
pstereo = OSS_MODE_STEREO;
oss_speed = pspeed;
oss_stereo = pstereo;
if((oss_audio_fd=open("/dev/dsp",O_WRONLY,0))==-1)
{
printf("Sound device not available!\n");
return;
}
if(ioctl(oss_audio_fd,SNDCTL_DSP_RESET,0)==-1)
{
printf("Sound reset failed\n");
return;
}
// we use 64 fragments with 1024 bytes each
// rearmed: now using 10*4096 for better latency
fragsize=12;
myfrag=(10<<16)|fragsize;
if(ioctl(oss_audio_fd,SNDCTL_DSP_SETFRAGMENT,&myfrag)==-1)
{
printf("Sound set fragment failed!\n");
return;
}
format = AFMT_S16_NE;
if(ioctl(oss_audio_fd,SNDCTL_DSP_SETFMT,&format) == -1)
{
printf("Sound format not supported!\n");
return;
}
if(format!=AFMT_S16_NE)
{
printf("Sound format not supported!\n");
return;
}
if(ioctl(oss_audio_fd,SNDCTL_DSP_STEREO,&oss_stereo)==-1 || !oss_stereo)
{
printf("Stereo mode not supported!\n");
return;
}
if(ioctl(oss_audio_fd,SNDCTL_DSP_SPEED,&oss_speed)==-1)
{
printf("Sound frequency not supported\n");
return;
}
if(oss_speed!=pspeed)
{
printf("Sound frequency not supported\n");
return;
}
}
////////////////////////////////////////////////////////////////////////
// REMOVE SOUND
////////////////////////////////////////////////////////////////////////
void RemoveSound(void)
{
if(oss_audio_fd != -1 )
{
close(oss_audio_fd);
oss_audio_fd = -1;
}
}
////////////////////////////////////////////////////////////////////////
// GET BYTES BUFFERED
////////////////////////////////////////////////////////////////////////
unsigned long SoundGetBytesBuffered(void)
{
audio_buf_info info;
unsigned long l;
if(oss_audio_fd == -1) return SOUNDSIZE;
if(ioctl(oss_audio_fd,SNDCTL_DSP_GETOSPACE,&info)==-1)
l=0;
else
{
if(info.fragments<(info.fragstotal>>1)) // can we write in at least the half of fragments?
l=SOUNDSIZE; // -> no? wait
else l=0; // -> else go on
}
return l;
}
////////////////////////////////////////////////////////////////////////
// FEED SOUND DATA
////////////////////////////////////////////////////////////////////////
void SoundFeedStreamData(unsigned char* pSound,long lBytes)
{
if(oss_audio_fd == -1) return;
write(oss_audio_fd,pSound,lBytes);
}
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