src/source.cc


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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set et sw=2 ts=2: */
/***************************************************************************
 *            source.cc
 *
 *  Thu Sep 25 10:35:39 CEST 2014
 *  Copyright 2014 Bent Bisballe Nyeng
 *  deva@aasimon.org
 ****************************************************************************/

/*
 *  This file is part of LibAudioIO.
 *
 *  LibAudioIO is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *  
 *  LibAudioIO 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
 *  Lesser General Public License for more details.
 *  
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with LibAudioIO; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */
#include "source.h"

Source::Source(snd_pcm_t *handle, unsigned int _samplerate,
               unsigned int _channels, snd_pcm_uframes_t _frames)
{
  this->handle = handle;
  this->_samplerate = _samplerate;
  this->_channels = _channels;
  this->_frames = _frames;
}

Source::~Source()
{
  snd_pcm_drain(handle);
  snd_pcm_close(handle);
}

int Source::readSamples(char *pcm, size_t maxsize)
{
	int rc;

	rc = snd_pcm_readi(handle, pcm, maxsize / sizeof(short) / _channels);
	if(rc == -EPIPE) {
		// EPIPE means overrun
		snd_pcm_prepare(handle);
    return -2;
	} else if (rc < 0) {
    return -1; // Read Error
	}

  return rc * sizeof(short) * _channels;
}

unsigned int Source::samplerate()
{
  return this->_samplerate;
}

unsigned int Source::channels()
{
  return this->_channels;
}

snd_pcm_uframes_t Source::frames()
{
  return this->_frames;
}