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alsa.c

/***************************************************************************
                            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_spu()
{
 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=44100;
 format=SND_PCM_FORMAT_S16;
 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 SoundFeedStreamData(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

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