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/*
* Copyright (C) 2011, Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#if ENABLE(WEB_AUDIO)
#include "DefaultAudioDestinationNode.h"
#include "ExceptionCode.h"
#include "Logging.h"
#include <wtf/MainThread.h>
const unsigned EnabledInputChannels = 2;
namespace WebCore {
DefaultAudioDestinationNode::DefaultAudioDestinationNode(AudioContext* context)
: AudioDestinationNode(context, AudioDestination::hardwareSampleRate())
, m_numberOfInputChannels(0)
{
// Node-specific default mixing rules.
m_channelCount = 2;
m_channelCountMode = Explicit;
m_channelInterpretation = AudioBus::Speakers;
}
DefaultAudioDestinationNode::~DefaultAudioDestinationNode()
{
uninitialize();
}
void DefaultAudioDestinationNode::initialize()
{
ASSERT(isMainThread());
if (isInitialized())
return;
createDestination();
AudioNode::initialize();
}
void DefaultAudioDestinationNode::uninitialize()
{
ASSERT(isMainThread());
if (!isInitialized())
return;
m_destination->stop();
m_numberOfInputChannels = 0;
AudioNode::uninitialize();
}
void DefaultAudioDestinationNode::createDestination()
{
float hardwareSampleRate = AudioDestination::hardwareSampleRate();
LOG(WebAudio, ">>>> hardwareSampleRate = %f\n", hardwareSampleRate);
m_destination = AudioDestination::create(*this, m_inputDeviceId, m_numberOfInputChannels, channelCount(), hardwareSampleRate);
}
void DefaultAudioDestinationNode::enableInput(const String& inputDeviceId)
{
ASSERT(isMainThread());
if (m_numberOfInputChannels != EnabledInputChannels) {
m_numberOfInputChannels = EnabledInputChannels;
m_inputDeviceId = inputDeviceId;
if (isInitialized()) {
// Re-create destination.
m_destination->stop();
createDestination();
m_destination->start();
}
}
}
void DefaultAudioDestinationNode::startRendering()
{
ASSERT(isInitialized());
if (isInitialized())
m_destination->start();
}
unsigned long DefaultAudioDestinationNode::maxChannelCount() const
{
return AudioDestination::maxChannelCount();
}
void DefaultAudioDestinationNode::setChannelCount(unsigned long channelCount, ExceptionCode& ec)
{
// The channelCount for the input to this node controls the actual number of channels we
// send to the audio hardware. It can only be set depending on the maximum number of
// channels supported by the hardware.
ASSERT(isMainThread());
if (!maxChannelCount() || channelCount > maxChannelCount()) {
ec = INVALID_STATE_ERR;
return;
}
unsigned long oldChannelCount = this->channelCount();
AudioNode::setChannelCount(channelCount, ec);
if (!ec && this->channelCount() != oldChannelCount && isInitialized()) {
// Re-create destination.
m_destination->stop();
createDestination();
m_destination->start();
}
}
} // namespace WebCore
#endif // ENABLE(WEB_AUDIO)
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