AudioContext.decodeAudioData returns a Promise

Source/modules/webaudio/AsyncAudioDecoder.cpp

 /*
  * 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 "modules/webaudio/AsyncAudioDecoder.h"
 
+#include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "core/dom/DOMArrayBuffer.h"
+#include "core/dom/DOMException.h"
+#include "core/dom/ExceptionCode.h"
 #include "modules/webaudio/AudioBuffer.h"
 #include "modules/webaudio/AudioBufferCallback.h"
+#include "modules/webaudio/AudioContext.h"
 #include "platform/Task.h"
 #include "platform/audio/AudioBus.h"
 #include "platform/audio/AudioFileReader.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebTraceLocation.h"
 #include "wtf/MainThread.h"
 #include "wtf/PassOwnPtr.h"
 
 namespace blink {
 
 AsyncAudioDecoder::AsyncAudioDecoder()
     : m_thread(adoptPtr(Platform::current()->createThread("Audio Decoder")))
 {
 }
 
 AsyncAudioDecoder::~AsyncAudioDecoder()
 {
 }
 
-void AsyncAudioDecoder::decodeAsync(DOMArrayBuffer* audioData, float sampleRate, AudioBufferCallback* successCallback, AudioBufferCallback* errorCallback)
+void AsyncAudioDecoder::decodeAsync(DOMArrayBuffer* audioData, float sampleRate, AudioBufferCallback* successCallback, AudioBufferCallback* errorCallback, ScriptPromiseResolver* resolver, AudioContext* context)
 {
     ASSERT(isMainThread());
     ASSERT(audioData);
-    if (!audioData)
-        return;
 
     // Add a ref to keep audioData alive until completion of decoding.
     RefPtr<DOMArrayBuffer> audioDataRef(audioData);
 
     // The leak references to successCallback and errorCallback are picked up on notifyComplete.
-    m_thread->postTask(FROM_HERE, new Task(bind(&AsyncAudioDecoder::decode, audioDataRef.release().leakRef(), sampleRate, successCallback, errorCallback)));
+    m_thread->postTask(FROM_HERE, new Task(bind(&AsyncAudioDecoder::decode, audioDataRef.release().leakRef(), sampleRate, successCallback, errorCallback, resolver, context)));
 }
 
-void AsyncAudioDecoder::decode(DOMArrayBuffer* audioData, float sampleRate, AudioBufferCallback* successCallback, AudioBufferCallback* errorCallback)
+void AsyncAudioDecoder::decode(DOMArrayBuffer* audioData, float sampleRate, AudioBufferCallback* successCallback, AudioBufferCallback* errorCallback, ScriptPromiseResolver* resolver, AudioContext* context)
 {
     RefPtr<AudioBus> bus = createBusFromInMemoryAudioFile(audioData->data(), audioData->byteLength(), false, sampleRate);
 
     // Decoding is finished, but we need to do the callbacks on the main thread.
     // The leaked reference to audioBuffer is picked up in notifyComplete.
-    Platform::current()->mainThread()->postTask(FROM_HERE, bind(&AsyncAudioDecoder::notifyComplete, audioData, successCallback, errorCallback, bus.release().leakRef()));
+    Platform::current()->mainThread()->postTask(FROM_HERE, bind(&AsyncAudioDecoder::notifyComplete, audioData, successCallback, errorCallback, bus.release().leakRef(), resolver, context));
 }
 
-void AsyncAudioDecoder::notifyComplete(DOMArrayBuffer* audioData, AudioBufferCallback* successCallback, AudioBufferCallback* errorCallback, AudioBus* audioBus)
+void AsyncAudioDecoder::notifyComplete(DOMArrayBuffer* audioData, AudioBufferCallback* successCallback, AudioBufferCallback* errorCallback, AudioBus* audioBus, ScriptPromiseResolver* resolver, AudioContext* context)
 {
+    ASSERT(isMainThread());
+
     // Adopt references, so everything gets correctly dereffed.
     RefPtr<DOMArrayBuffer> audioDataRef = adoptRef(audioData);
     RefPtr<AudioBus> audioBusRef = adoptRef(audioBus);
 
     AudioBuffer* audioBuffer = AudioBuffer::createFromAudioBus(audioBus);
-    if (audioBuffer && successCallback)
-        successCallback->handleEvent(audioBuffer);
-    else if (errorCallback)
-        errorCallback->handleEvent(audioBuffer);
+    if (audioBuffer) {
+        resolver->resolve(audioBuffer);
+        if (successCallback)
+            successCallback->handleEvent(audioBuffer);
+    } else {
+        RefPtrWillBeRawPtr<DOMException> error = DOMException::create(
+            EncodingError,
+            "Unable to decode audio data");
+        resolver->reject(error);
+        if (errorCallback)
+            errorCallback->handleEvent(error.get());
+    }
+    // Tell context to remove this resolver since it's been fulfilled.
+    context->removeAudioDecoderResolver(resolver);
 }
 
 } // namespace blink
 
 #endif // ENABLE(WEB_AUDIO)