/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
 *            audiooutputenginedummy.cc
 *
 *  Sat Apr 30 21:12:02 CEST 2011
 *  Copyright 2011 Bent Bisballe Nyeng
 *  deva@aasimon.org
 ****************************************************************************/

/*
 *  This file is part of DrumGizmo.
 *
 *  DrumGizmo 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.
 *
 *  DrumGizmo 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 DrumGizmo; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
 */
#include "audioout.h"


#define T(x, msg) if(x < 0) { printf("%s failed: %s\n", msg, snd_strerror(x)); fflush(stdout); }

AudioOut::AudioOut(std::string device, unsigned int srate, int channels)
{
  handle = NULL;

  snd_pcm_uframes_t frames = 940;

  int rc;

  rc = snd_pcm_open(&handle, device.c_str(), SND_PCM_STREAM_PLAYBACK, 0);
  T(rc, "snd_pcm_open");

  if(!handle) {
    printf("No handle!\n");
    //    return false;
  }

  // Allocate a hardware parameters object.
  snd_pcm_hw_params_alloca(&params);
  //  if(rc < 0) return false;

  // Fill it in with default values.
  rc = snd_pcm_hw_params_any(handle, params);
  T(rc, "snd_pcm_hw_params_any");

  rc = snd_pcm_hw_params_set_access(handle, params,
                                    SND_PCM_ACCESS_RW_INTERLEAVED);
  T(rc, "snd_pcm_hw_params_set_access");

  rc = snd_pcm_hw_params_set_format(handle, params, SND_PCM_FORMAT_FLOAT);
  T(rc, "snd_pcm_hw_params_set_format");

  rc = snd_pcm_hw_params_set_channels(handle, params, channels);
  T(rc, "snd_pcm_hw_params_set_channels");

  rc = snd_pcm_hw_params_set_rate_near(handle, params, &srate, 0);
  T(rc, "snd_pcm_hw_params_set_rate_near");

  rc = snd_pcm_hw_params_set_period_size_near(handle, params, &frames, 0);
  T(rc, "snd_pcm_hw_params_set_period_size_near");
  
  rc = snd_pcm_hw_params(handle, params);
  T(rc, "snd_pcm_hw_params");
}

AudioOut::~AudioOut()
{
  if(handle) snd_pcm_close(handle);
}

void AudioOut::write(sample_t *samples, size_t size)
{
  // Write the interleaved buffer to the soundcard
  size_t sz = 0;
  while(size > sz) {
    sz += snd_pcm_writei(handle, samples + sz, size - sz);
  }
}