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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/core/v8/ExceptionMessages.h"
     32 #include "bindings/core/v8/ExceptionState.h"
     33 #include "core/dom/ExceptionCode.h"
     34 #include "platform/Logging.h"
     35 #include "wtf/MainThread.h"
     36 
     37 namespace blink {
     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     ASSERT(!isInitialized());
     52 }
     53 
     54 void DefaultAudioDestinationNode::dispose()
     55 {
     56     uninitialize();
     57     AudioDestinationNode::dispose();
     58 }
     59 
     60 void DefaultAudioDestinationNode::initialize()
     61 {
     62     ASSERT(isMainThread());
     63     if (isInitialized())
     64         return;
     65 
     66     createDestination();
     67     AudioNode::initialize();
     68 }
     69 
     70 void DefaultAudioDestinationNode::uninitialize()
     71 {
     72     ASSERT(isMainThread());
     73     if (!isInitialized())
     74         return;
     75 
     76     m_destination->stop();
     77     m_numberOfInputChannels = 0;
     78 
     79     AudioNode::uninitialize();
     80 }
     81 
     82 void DefaultAudioDestinationNode::createDestination()
     83 {
     84     float hardwareSampleRate = AudioDestination::hardwareSampleRate();
     85     WTF_LOG(WebAudio, ">>>> hardwareSampleRate = %f\n", hardwareSampleRate);
     86 
     87     m_destination = AudioDestination::create(*this, m_inputDeviceId, m_numberOfInputChannels, channelCount(), hardwareSampleRate);
     88 }
     89 
     90 void DefaultAudioDestinationNode::startRendering()
     91 {
     92     ASSERT(isInitialized());
     93     if (isInitialized())
     94         m_destination->start();
     95 }
     96 
     97 unsigned long DefaultAudioDestinationNode::maxChannelCount() const
     98 {
     99     return AudioDestination::maxChannelCount();
    100 }
    101 
    102 void DefaultAudioDestinationNode::setChannelCount(unsigned long channelCount, ExceptionState& exceptionState)
    103 {
    104     // The channelCount for the input to this node controls the actual number of channels we
    105     // send to the audio hardware. It can only be set depending on the maximum number of
    106     // channels supported by the hardware.
    107 
    108     ASSERT(isMainThread());
    109 
    110     if (!maxChannelCount() || channelCount > maxChannelCount()) {
    111         exceptionState.throwDOMException(
    112             IndexSizeError,
    113             ExceptionMessages::indexOutsideRange<unsigned>("channel count", channelCount, 1, ExceptionMessages::InclusiveBound, maxChannelCount(), ExceptionMessages::InclusiveBound));
    114         return;
    115     }
    116 
    117     unsigned long oldChannelCount = this->channelCount();
    118     AudioNode::setChannelCount(channelCount, exceptionState);
    119 
    120     if (!exceptionState.hadException() && this->channelCount() != oldChannelCount && isInitialized()) {
    121         // Re-create destination.
    122         m_destination->stop();
    123         createDestination();
    124         m_destination->start();
    125     }
    126 }
    127 
    128 } // namespace blink
    129 
    130 #endif // ENABLE(WEB_AUDIO)
    131