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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 "OfflineAudioDestinationNode.h"
#include "AudioBus.h"
#include "AudioContext.h"
#include "HRTFDatabaseLoader.h"
#include <algorithm>
#include <wtf/Threading.h>
using namespace std;
namespace WebCore {
const size_t renderQuantumSize = 128;
OfflineAudioDestinationNode::OfflineAudioDestinationNode(AudioContext* context, AudioBuffer* renderTarget)
: AudioDestinationNode(context, renderTarget->sampleRate())
, m_renderTarget(renderTarget)
, m_startedRendering(false)
{
m_renderBus = adoptPtr(new AudioBus(renderTarget->numberOfChannels(), renderQuantumSize));
initialize();
}
OfflineAudioDestinationNode::~OfflineAudioDestinationNode()
{
uninitialize();
}
void OfflineAudioDestinationNode::initialize()
{
if (isInitialized())
return;
AudioNode::initialize();
}
void OfflineAudioDestinationNode::uninitialize()
{
if (!isInitialized())
return;
AudioNode::uninitialize();
}
void OfflineAudioDestinationNode::startRendering()
{
ASSERT(isMainThread());
ASSERT(m_renderTarget.get());
if (!m_renderTarget.get())
return;
if (!m_startedRendering) {
m_startedRendering = true;
m_renderThread = createThread(OfflineAudioDestinationNode::renderEntry, this, "offline renderer");
}
}
// Do offline rendering in this thread.
void* OfflineAudioDestinationNode::renderEntry(void* threadData)
{
OfflineAudioDestinationNode* destinationNode = reinterpret_cast<OfflineAudioDestinationNode*>(threadData);
ASSERT(destinationNode);
destinationNode->render();
return 0;
}
void OfflineAudioDestinationNode::render()
{
ASSERT(!isMainThread());
ASSERT(m_renderBus.get());
if (!m_renderBus.get())
return;
bool channelsMatch = m_renderBus->numberOfChannels() == m_renderTarget->numberOfChannels();
ASSERT(channelsMatch);
if (!channelsMatch)
return;
bool isRenderBusAllocated = m_renderBus->length() >= renderQuantumSize;
ASSERT(isRenderBusAllocated);
if (!isRenderBusAllocated)
return;
// Synchronize with HRTFDatabaseLoader.
// The database must be loaded before we can proceed.
HRTFDatabaseLoader* loader = HRTFDatabaseLoader::loader();
ASSERT(loader);
if (!loader)
return;
loader->waitForLoaderThreadCompletion();
// Break up the render target into smaller "render quantize" sized pieces.
// Render until we're finished.
size_t framesToProcess = m_renderTarget->length();
unsigned numberOfChannels = m_renderTarget->numberOfChannels();
unsigned n = 0;
while (framesToProcess > 0) {
// Render one render quantum.
provideInput(m_renderBus.get(), renderQuantumSize);
size_t framesAvailableToCopy = min(framesToProcess, renderQuantumSize);
for (unsigned channelIndex = 0; channelIndex < numberOfChannels; ++channelIndex) {
float* source = m_renderBus->channel(channelIndex)->data();
float* destination = m_renderTarget->getChannelData(channelIndex)->data();
memcpy(destination + n, source, sizeof(float) * framesAvailableToCopy);
}
n += framesAvailableToCopy;
framesToProcess -= framesAvailableToCopy;
}
// Our work is done. Let the AudioContext know.
callOnMainThread(notifyCompleteDispatch, this);
}
void OfflineAudioDestinationNode::notifyCompleteDispatch(void* userData)
{
OfflineAudioDestinationNode* destinationNode = static_cast<OfflineAudioDestinationNode*>(userData);
ASSERT(destinationNode);
if (!destinationNode)
return;
destinationNode->notifyComplete();
}
void OfflineAudioDestinationNode::notifyComplete()
{
context()->fireCompletionEvent();
}
} // namespace WebCore
#endif // ENABLE(WEB_AUDIO)
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