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/*******************************************************************************
* Copyright 2009-2016 Jörg Müller
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
******************************************************************************/
#include "OpenALReader.h"
#include "respec/ConverterFunctions.h"
#include "Exception.h"
#include <algorithm>
#include <al.h>
AUD_NAMESPACE_BEGIN
OpenALReader::OpenALReader(Specs specs, int buffersize) :
m_specs(specs),
m_position(0),
m_device(nullptr)
{
if((specs.channels != CHANNELS_MONO) && (specs.channels != CHANNELS_STEREO))
specs.channels = CHANNELS_MONO;
m_device = alcCaptureOpenDevice(nullptr, specs.rate,
specs.channels == CHANNELS_MONO ? AL_FORMAT_MONO16 : AL_FORMAT_STEREO16,
buffersize * specs.channels * 2);
if(!m_device)
AUD_THROW(DeviceException, "The capture device couldn't be opened with OpenAL.");
alcCaptureStart(m_device);
}
OpenALReader::~OpenALReader()
{
if(m_device)
{
//alcCaptureStop(m_device);
alcCaptureCloseDevice(m_device);
}
}
bool OpenALReader::isSeekable() const
{
return false;
}
void OpenALReader::seek(int position)
{
m_position = position;
}
int OpenALReader::getLength() const
{
int length;
alcGetIntegerv(m_device, ALC_CAPTURE_SAMPLES, 1, &length);
return length;
}
int OpenALReader::getPosition() const
{
return m_position;
}
Specs OpenALReader::getSpecs() const
{
return m_specs;
}
void OpenALReader::read(int & length, bool& eos, sample_t* buffer)
{
int len = getLength();
length = std::min(length, len);
if(length > 0)
{
alcCaptureSamples(m_device, buffer, length);
convert_s16_float((data_t*)buffer, (data_t*)buffer, length * m_specs.channels);
}
eos = false;
m_position += length;
}
AUD_NAMESPACE_END
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