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      1 /*
      2  * Copyright (C) 2011, 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/DefaultAudioDestinationNode.h"
     30 
     31 #include "bindings/v8/ExceptionMessages.h"
     32 #include "bindings/v8/ExceptionState.h"
     33 #include "core/dom/ExceptionCode.h"
     34 #include "platform/Logging.h"
     35 #include "wtf/MainThread.h"
     36 
     37 namespace WebCore {
     38 
     39 DefaultAudioDestinationNode::DefaultAudioDestinationNode(AudioContext* context)
     40     : AudioDestinationNode(context, AudioDestination::hardwareSampleRate())
     41     , m_numberOfInputChannels(0)
     42 {
     43     // Node-specific default mixing rules.
     44     m_channelCount = 2;
     45     m_channelCountMode = Explicit;
     46     m_channelInterpretation = AudioBus::Speakers;
     47 }
     48 
     49 DefaultAudioDestinationNode::~DefaultAudioDestinationNode()
     50 {
     51     uninitialize();
     52 }
     53 
     54 void DefaultAudioDestinationNode::initialize()
     55 {
     56     ASSERT(isMainThread());
     57     if (isInitialized())
     58         return;
     59 
     60     createDestination();
     61     AudioNode::initialize();
     62 }
     63 
     64 void DefaultAudioDestinationNode::uninitialize()
     65 {
     66     ASSERT(isMainThread());
     67     if (!isInitialized())
     68         return;
     69 
     70     m_destination->stop();
     71     m_numberOfInputChannels = 0;
     72 
     73     AudioNode::uninitialize();
     74 }
     75 
     76 void DefaultAudioDestinationNode::createDestination()
     77 {
     78     float hardwareSampleRate = AudioDestination::hardwareSampleRate();
     79     WTF_LOG(WebAudio, ">>>> hardwareSampleRate = %f\n", hardwareSampleRate);
     80 
     81     m_destination = AudioDestination::create(*this, m_inputDeviceId, m_numberOfInputChannels, channelCount(), hardwareSampleRate);
     82 }
     83 
     84 void DefaultAudioDestinationNode::startRendering()
     85 {
     86     ASSERT(isInitialized());
     87     if (isInitialized())
     88         m_destination->start();
     89 }
     90 
     91 unsigned long DefaultAudioDestinationNode::maxChannelCount() const
     92 {
     93     return AudioDestination::maxChannelCount();
     94 }
     95 
     96 void DefaultAudioDestinationNode::setChannelCount(unsigned long channelCount, ExceptionState& exceptionState)
     97 {
     98     // The channelCount for the input to this node controls the actual number of channels we
     99     // send to the audio hardware. It can only be set depending on the maximum number of
    100     // channels supported by the hardware.
    101 
    102     ASSERT(isMainThread());
    103 
    104     if (!maxChannelCount() || channelCount > maxChannelCount()) {
    105         exceptionState.throwDOMException(
    106             IndexSizeError,
    107             ExceptionMessages::indexOutsideRange<unsigned>("channel count", channelCount, 1, ExceptionMessages::InclusiveBound, maxChannelCount(), ExceptionMessages::InclusiveBound));
    108         return;
    109     }
    110 
    111     unsigned long oldChannelCount = this->channelCount();
    112     AudioNode::setChannelCount(channelCount, exceptionState);
    113 
    114     if (!exceptionState.hadException() && this->channelCount() != oldChannelCount && isInitialized()) {
    115         // Re-create destination.
    116         m_destination->stop();
    117         createDestination();
    118         m_destination->start();
    119     }
    120 }
    121 
    122 } // namespace WebCore
    123 
    124 #endif // ENABLE(WEB_AUDIO)
    125