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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 PassRefPtr<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 0;
     47     }
     48 
     49     Document* document = toDocument(context);
     50 
     51     if (!numberOfFrames) {
     52         exceptionState.throwDOMException(SyntaxError, "number of frames cannot be zero.");
     53         return 0;
     54     }
     55 
     56     if (numberOfChannels > 10) {
     57         exceptionState.throwDOMException(SyntaxError, "number of channels (" + String::number(numberOfChannels) + ") exceeds maximum (10).");
     58         return 0;
     59     }
     60 
     61     if (!isSampleRateRangeGood(sampleRate)) {
     62         exceptionState.throwDOMException(SyntaxError, "sample rate (" + String::number(sampleRate) + ") must be in the range 44100-96000 Hz.");
     63         return 0;
     64     }
     65 
     66     RefPtr<OfflineAudioContext> audioContext(adoptRef(new OfflineAudioContext(document, numberOfChannels, numberOfFrames, sampleRate)));
     67     audioContext->suspendIfNeeded();
     68     return audioContext.release();
     69 }
     70 
     71 OfflineAudioContext::OfflineAudioContext(Document* document, unsigned numberOfChannels, size_t numberOfFrames, float sampleRate)
     72     : AudioContext(document, numberOfChannels, numberOfFrames, sampleRate)
     73 {
     74     ScriptWrappable::init(this);
     75 }
     76 
     77 OfflineAudioContext::~OfflineAudioContext()
     78 {
     79 }
     80 
     81 } // namespace WebCore
     82 
     83 #endif // ENABLE(WEB_AUDIO)
     84