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      1 /*
      2  * Copyright (C) 2012, Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1.  Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2.  Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     15  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     16  * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
     17  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     18  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     19  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
     20  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     21  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
     22  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     23  */
     24 
     25 #include "config.h"
     26 
     27 #if ENABLE(WEB_AUDIO)
     28 
     29 #include "modules/webaudio/OfflineAudioContext.h"
     30 
     31 #include "bindings/v8/ExceptionMessages.h"
     32 #include "bindings/v8/ExceptionState.h"
     33 #include "core/dom/Document.h"
     34 #include "core/dom/ExceptionCode.h"
     35 #include "core/dom/ExecutionContext.h"
     36 
     37 namespace WebCore {
     38 
     39 PassRefPtrWillBeRawPtr<OfflineAudioContext> OfflineAudioContext::create(ExecutionContext* context, unsigned numberOfChannels, size_t numberOfFrames, float sampleRate, ExceptionState& exceptionState)
     40 {
     41     // FIXME: add support for workers.
     42     if (!context || !context->isDocument()) {
     43         exceptionState.throwDOMException(
     44             NotSupportedError,
     45             "Workers are not supported.");
     46         return nullptr;
     47     }
     48 
     49     Document* document = toDocument(context);
     50 
     51     if (!numberOfFrames) {
     52         exceptionState.throwDOMException(SyntaxError, "number of frames cannot be zero.");
     53         return nullptr;
     54     }
     55 
     56     if (numberOfChannels > AudioContext::maxNumberOfChannels()) {
     57         exceptionState.throwDOMException(
     58             IndexSizeError,
     59             ExceptionMessages::indexOutsideRange<unsigned>(
     60                 "number of channels",
     61                 numberOfChannels,
     62                 0,
     63                 ExceptionMessages::InclusiveBound,
     64                 AudioContext::maxNumberOfChannels(),
     65                 ExceptionMessages::InclusiveBound));
     66         return nullptr;
     67     }
     68 
     69     if (!isSampleRateRangeGood(sampleRate)) {
     70         exceptionState.throwDOMException(SyntaxError, "sample rate (" + String::number(sampleRate) + ") must be in the range 44100-96000 Hz.");
     71         return nullptr;
     72     }
     73 
     74     RefPtrWillBeRawPtr<OfflineAudioContext> audioContext(adoptRefWillBeThreadSafeRefCountedGarbageCollected(new OfflineAudioContext(document, numberOfChannels, numberOfFrames, sampleRate)));
     75 
     76     if (!audioContext->destination()) {
     77         exceptionState.throwDOMException(
     78             NotSupportedError,
     79             "OfflineAudioContext(" + String::number(numberOfChannels)
     80             + ", " + String::number(numberOfFrames)
     81             + ", " + String::number(sampleRate)
     82             + ")");
     83     }
     84 
     85     audioContext->suspendIfNeeded();
     86     return audioContext.release();
     87 }
     88 
     89 OfflineAudioContext::OfflineAudioContext(Document* document, unsigned numberOfChannels, size_t numberOfFrames, float sampleRate)
     90     : AudioContext(document, numberOfChannels, numberOfFrames, sampleRate)
     91 {
     92     ScriptWrappable::init(this);
     93 }
     94 
     95 OfflineAudioContext::~OfflineAudioContext()
     96 {
     97 }
     98 
     99 } // namespace WebCore
    100 
    101 #endif // ENABLE(WEB_AUDIO)
    102