pcsx2/plugins/PeopsSPU2/alsa.c

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/***************************************************************************
alsa.c - description
-------------------
begin : Sat Mar 01 2003
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. *
* *
***************************************************************************/
//*************************************************************************//
// History of changes:
//
// 2003/03/02 - linuzappz
// - fixed XRUN behavior
//
// 2003/03/01 - linuzappz
// - created
//
//*************************************************************************//
#include "stdafx.h"
#define _IN_OSS
#include "externals.h"
#ifndef _WINDOWS
#define ALSA_PCM_NEW_HW_PARAMS_API
#define ALSA_PCM_NEW_SW_PARAMS_API
#include <alsa/asoundlib.h>
////////////////////////////////////////////////////////////////////////
// small linux time helper... only used for watchdog
////////////////////////////////////////////////////////////////////////
unsigned long timeGetTime()
{
struct timeval tv;
gettimeofday(&tv, 0); // well, maybe there are better ways
return tv.tv_sec * 1000 + tv.tv_usec/1000; // to do that, but at least it works
}
////////////////////////////////////////////////////////////////////////
// oss globals
////////////////////////////////////////////////////////////////////////
#define ALSA_MEM_DEF
#include "alsa.h"
static snd_pcm_t *handle = NULL;
static snd_pcm_uframes_t buffer_size;
////////////////////////////////////////////////////////////////////////
// SETUP SOUND
////////////////////////////////////////////////////////////////////////
void SetupSound(void)
{
snd_pcm_hw_params_t *hwparams;
snd_pcm_sw_params_t *swparams;
snd_pcm_status_t *status;
int pspeed;
int pchannels;
int format;
int buffer_time;
int period_time;
int err;
if(iDisStereo) pchannels=1;
else pchannels=2;
pspeed=48000;
format=SND_PCM_FORMAT_S16_LE;
buffer_time=500000;
period_time=buffer_time/4;
if((err=snd_pcm_open(&handle, "default",
SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK))<0)
{
printf("Audio open error: %s\n", snd_strerror(err));
return;
}
if((err=snd_pcm_nonblock(handle, 0))<0)
{
printf("Can't set blocking moded: %s\n", snd_strerror(err));
return;
}
snd_pcm_hw_params_alloca(&hwparams);
snd_pcm_sw_params_alloca(&swparams);
if((err=snd_pcm_hw_params_any(handle, hwparams))<0)
{
printf("Broken configuration for this PCM: %s\n", snd_strerror(err));
return;
}
if((err=snd_pcm_hw_params_set_access(handle, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED))<0)
{
printf("Access type not available: %s\n", snd_strerror(err));
return;
}
if((err=snd_pcm_hw_params_set_format(handle, hwparams, format))<0)
{
printf("Sample format not available: %s\n", snd_strerror(err));
return;
}
if((err=snd_pcm_hw_params_set_channels(handle, hwparams, pchannels))<0)
{
printf("Channels count not available: %s\n", snd_strerror(err));
return;
}
if((err=snd_pcm_hw_params_set_rate_near(handle, hwparams, &pspeed, 0))<0)
{
printf("Rate not available: %s\n", snd_strerror(err));
return;
}
if((err=snd_pcm_hw_params_set_buffer_time_near(handle, hwparams, &buffer_time, 0))<0)
{
printf("Buffer time error: %s\n", snd_strerror(err));
return;
}
if((err=snd_pcm_hw_params_set_period_time_near(handle, hwparams, &period_time, 0))<0)
{
printf("Period time error: %s\n", snd_strerror(err));
return;
}
if((err=snd_pcm_hw_params(handle, hwparams))<0)
{
printf("Unable to install hw params: %s\n", snd_strerror(err));
return;
}
snd_pcm_status_alloca(&status);
if((err=snd_pcm_status(handle, status))<0)
{
printf("Unable to get status: %s\n", snd_strerror(err));
return;
}
buffer_size=snd_pcm_status_get_avail(status);
}
////////////////////////////////////////////////////////////////////////
// REMOVE SOUND
////////////////////////////////////////////////////////////////////////
void RemoveSound(void)
{
if(handle != NULL)
{
snd_pcm_drop(handle);
snd_pcm_close(handle);
handle = NULL;
}
}
////////////////////////////////////////////////////////////////////////
// GET BYTES BUFFERED
////////////////////////////////////////////////////////////////////////
unsigned long SoundGetBytesBuffered(void)
{
unsigned long l;
if(handle == NULL) // failed to open?
return SOUNDSIZE;
l = snd_pcm_avail_update(handle);
if(l<0) return 0;
if(l<buffer_size/2) // 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 SoundFeedVoiceData(unsigned char* pSound,long lBytes)
{
if(handle == NULL) return;
if(snd_pcm_state(handle) == SND_PCM_STATE_XRUN)
snd_pcm_prepare(handle);
snd_pcm_writei(handle,pSound,
iDisStereo == 1 ? lBytes/2 : lBytes/4);
}
#endif