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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 "AsyncAudioDecoder.h"
#include "AudioBuffer.h"
#include "AudioBufferCallback.h"
#include <wtf/ArrayBuffer.h>
#include <wtf/MainThread.h>
#include <wtf/OwnPtr.h>
#include <wtf/PassOwnPtr.h>
namespace WebCore {
AsyncAudioDecoder::AsyncAudioDecoder()
{
// Start worker thread.
MutexLocker lock(m_threadCreationMutex);
m_threadID = createThread(AsyncAudioDecoder::threadEntry, this, "Audio Decoder");
}
AsyncAudioDecoder::~AsyncAudioDecoder()
{
m_queue.kill();
// Stop thread.
waitForThreadCompletion(m_threadID);
m_threadID = 0;
}
void AsyncAudioDecoder::decodeAsync(ArrayBuffer* audioData, float sampleRate, PassRefPtr<AudioBufferCallback> successCallback, PassRefPtr<AudioBufferCallback> errorCallback)
{
ASSERT(isMainThread());
ASSERT(audioData);
if (!audioData)
return;
OwnPtr<DecodingTask> decodingTask = DecodingTask::create(audioData, sampleRate, successCallback, errorCallback);
m_queue.append(decodingTask.release()); // note that ownership of the task is effectively taken by the queue.
}
// Asynchronously decode in this thread.
void AsyncAudioDecoder::threadEntry(void* threadData)
{
ASSERT(threadData);
AsyncAudioDecoder* decoder = reinterpret_cast<AsyncAudioDecoder*>(threadData);
decoder->runLoop();
}
void AsyncAudioDecoder::runLoop()
{
ASSERT(!isMainThread());
{
// Wait for until we have m_threadID established before starting the run loop.
MutexLocker lock(m_threadCreationMutex);
}
// Keep running decoding tasks until we're killed.
while (OwnPtr<DecodingTask> decodingTask = m_queue.waitForMessage()) {
// Let the task take care of its own ownership.
// See DecodingTask::notifyComplete() for cleanup.
decodingTask.leakPtr()->decode();
}
}
PassOwnPtr<AsyncAudioDecoder::DecodingTask> AsyncAudioDecoder::DecodingTask::create(ArrayBuffer* audioData, float sampleRate, PassRefPtr<AudioBufferCallback> successCallback, PassRefPtr<AudioBufferCallback> errorCallback)
{
return adoptPtr(new DecodingTask(audioData, sampleRate, successCallback, errorCallback));
}
AsyncAudioDecoder::DecodingTask::DecodingTask(ArrayBuffer* audioData, float sampleRate, PassRefPtr<AudioBufferCallback> successCallback, PassRefPtr<AudioBufferCallback> errorCallback)
: m_audioData(audioData)
, m_sampleRate(sampleRate)
, m_successCallback(successCallback)
, m_errorCallback(errorCallback)
{
}
void AsyncAudioDecoder::DecodingTask::decode()
{
ASSERT(m_audioData.get());
if (!m_audioData.get())
return;
// Do the actual decoding and invoke the callback.
m_audioBuffer = AudioBuffer::createFromAudioFileData(m_audioData->data(), m_audioData->byteLength(), false, sampleRate());
// Decoding is finished, but we need to do the callbacks on the main thread.
callOnMainThread(notifyCompleteDispatch, this);
}
void AsyncAudioDecoder::DecodingTask::notifyCompleteDispatch(void* userData)
{
AsyncAudioDecoder::DecodingTask* task = reinterpret_cast<AsyncAudioDecoder::DecodingTask*>(userData);
ASSERT(task);
if (!task)
return;
task->notifyComplete();
}
void AsyncAudioDecoder::DecodingTask::notifyComplete()
{
if (audioBuffer() && successCallback())
successCallback()->handleEvent(audioBuffer());
else if (errorCallback())
errorCallback()->handleEvent(audioBuffer());
// Our ownership was given up in AsyncAudioDecoder::runLoop()
// Make sure to clean up here.
delete this;
}
} // namespace WebCore
#endif // ENABLE(WEB_AUDIO)
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