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/*
* Copyright (C) 2012, 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 "modules/webaudio/MediaStreamAudioDestinationNode.h"
#include "bindings/core/v8/ExceptionMessages.h"
#include "bindings/core/v8/ExceptionState.h"
#include "core/dom/ExceptionCode.h"
#include "modules/webaudio/AbstractAudioContext.h"
#include "modules/webaudio/AudioNodeInput.h"
#include "platform/UUID.h"
#include "platform/mediastream/MediaStreamCenter.h"
#include "public/platform/WebRTCPeerConnectionHandler.h"
#include "wtf/Locker.h"
namespace blink {
// WebAudioCapturerSource ignores the channel count beyond 8, so we set the
// block here to avoid anything can cause the crash.
static const unsigned long kMaxChannelCount = 8;
MediaStreamAudioDestinationHandler::MediaStreamAudioDestinationHandler(AudioNode& node, size_t numberOfChannels)
: AudioBasicInspectorHandler(NodeTypeMediaStreamAudioDestination, node, node.context()->sampleRate(), numberOfChannels)
, m_mixBus(AudioBus::create(numberOfChannels, ProcessingSizeInFrames))
{
m_source = MediaStreamSource::create("WebAudio-" + createCanonicalUUIDString(), MediaStreamSource::TypeAudio, "MediaStreamAudioDestinationNode", false, true, MediaStreamSource::ReadyStateLive, true);
MediaStreamSourceVector audioSources;
audioSources.append(m_source.get());
MediaStreamSourceVector videoSources;
m_stream = MediaStream::create(node.context()->getExecutionContext(), MediaStreamDescriptor::create(audioSources, videoSources));
MediaStreamCenter::instance().didCreateMediaStreamAndTracks(m_stream->descriptor());
m_source->setAudioFormat(numberOfChannels, node.context()->sampleRate());
initialize();
}
PassRefPtr<MediaStreamAudioDestinationHandler> MediaStreamAudioDestinationHandler::create(AudioNode& node, size_t numberOfChannels)
{
return adoptRef(new MediaStreamAudioDestinationHandler(node, numberOfChannels));
}
MediaStreamAudioDestinationHandler::~MediaStreamAudioDestinationHandler()
{
uninitialize();
}
void MediaStreamAudioDestinationHandler::process(size_t numberOfFrames)
{
// Conform the input bus into the internal mix bus, which represents
// MediaStreamDestination's channel count.
m_mixBus->copyFrom(*input(0).bus());
m_source->consumeAudio(m_mixBus.get(), numberOfFrames);
}
void MediaStreamAudioDestinationHandler::setChannelCount(unsigned long channelCount, ExceptionState& exceptionState)
{
ASSERT(isMainThread());
// Currently the maximum channel count supported for this node is 8,
// which is constrained by m_source (WebAudioCapturereSource). Although
// it has its own safety check for the excessive channels, throwing an
// exception here is useful to developers.
if (channelCount > maxChannelCount()) {
exceptionState.throwDOMException(
IndexSizeError,
ExceptionMessages::indexOutsideRange<unsigned>("channel count",
channelCount,
1,
ExceptionMessages::InclusiveBound,
maxChannelCount(),
ExceptionMessages::InclusiveBound));
return;
}
unsigned long oldChannelCount = this->channelCount();
AudioHandler::setChannelCount(channelCount, exceptionState);
// Update the pipeline with the new channel count only if absolutely
// necessary. This process requires the graph lock.
//
// TODO(hongchan): There might be a data race here since both threads
// have access to m_mixBus.
if (!exceptionState.hadException() && this->channelCount() != oldChannelCount && isInitialized()) {
AbstractAudioContext::AutoLocker locker(context());
m_mixBus = AudioBus::create(channelCount, ProcessingSizeInFrames);
m_source->setAudioFormat(channelCount, context()->sampleRate());
}
}
unsigned long MediaStreamAudioDestinationHandler::maxChannelCount() const
{
return kMaxChannelCount;
}
// ----------------------------------------------------------------
MediaStreamAudioDestinationNode::MediaStreamAudioDestinationNode(AbstractAudioContext& context, size_t numberOfChannels)
: AudioBasicInspectorNode(context)
{
setHandler(MediaStreamAudioDestinationHandler::create(*this, numberOfChannels));
}
MediaStreamAudioDestinationNode* MediaStreamAudioDestinationNode::create(AbstractAudioContext& context, size_t numberOfChannels)
{
return new MediaStreamAudioDestinationNode(context, numberOfChannels);
}
MediaStream* MediaStreamAudioDestinationNode::stream() const
{
return static_cast<MediaStreamAudioDestinationHandler&>(handler()).stream();
}
} // namespace blink
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