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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 const unsigned EnabledInputChannels = 2;
     38 
     39 namespace WebCore {
     40 
     41 DefaultAudioDestinationNode::DefaultAudioDestinationNode(AudioContext* context)
     42     : AudioDestinationNode(context, AudioDestination::hardwareSampleRate())
     43     , m_numberOfInputChannels(0)
     44 {
     45     // Node-specific default mixing rules.
     46     m_channelCount = 2;
     47     m_channelCountMode = Explicit;
     48     m_channelInterpretation = AudioBus::Speakers;
     49 }
     50 
     51 DefaultAudioDestinationNode::~DefaultAudioDestinationNode()
     52 {
     53     uninitialize();
     54 }
     55 
     56 void DefaultAudioDestinationNode::initialize()
     57 {
     58     ASSERT(isMainThread());
     59     if (isInitialized())
     60         return;
     61 
     62     createDestination();
     63     AudioNode::initialize();
     64 }
     65 
     66 void DefaultAudioDestinationNode::uninitialize()
     67 {
     68     ASSERT(isMainThread());
     69     if (!isInitialized())
     70         return;
     71 
     72     m_destination->stop();
     73     m_numberOfInputChannels = 0;
     74 
     75     AudioNode::uninitialize();
     76 }
     77 
     78 void DefaultAudioDestinationNode::createDestination()
     79 {
     80     float hardwareSampleRate = AudioDestination::hardwareSampleRate();
     81     WTF_LOG(WebAudio, ">>>> hardwareSampleRate = %f\n", hardwareSampleRate);
     82 
     83     m_destination = AudioDestination::create(*this, m_inputDeviceId, m_numberOfInputChannels, channelCount(), hardwareSampleRate);
     84 }
     85 
     86 void DefaultAudioDestinationNode::enableInput(const String& inputDeviceId)
     87 {
     88     ASSERT(isMainThread());
     89     if (m_numberOfInputChannels != EnabledInputChannels) {
     90         m_numberOfInputChannels = EnabledInputChannels;
     91         m_inputDeviceId = inputDeviceId;
     92 
     93         if (isInitialized()) {
     94             // Re-create destination.
     95             m_destination->stop();
     96             createDestination();
     97             m_destination->start();
     98         }
     99     }
    100 }
    101 
    102 void DefaultAudioDestinationNode::startRendering()
    103 {
    104     ASSERT(isInitialized());
    105     if (isInitialized())
    106         m_destination->start();
    107 }
    108 
    109 unsigned long DefaultAudioDestinationNode::maxChannelCount() const
    110 {
    111     return AudioDestination::maxChannelCount();
    112 }
    113 
    114 void DefaultAudioDestinationNode::setChannelCount(unsigned long channelCount, ExceptionState& exceptionState)
    115 {
    116     // The channelCount for the input to this node controls the actual number of channels we
    117     // send to the audio hardware. It can only be set depending on the maximum number of
    118     // channels supported by the hardware.
    119 
    120     ASSERT(isMainThread());
    121 
    122     if (!maxChannelCount() || channelCount > maxChannelCount()) {
    123         exceptionState.throwDOMException(
    124             IndexSizeError,
    125             ExceptionMessages::failedToSet(
    126                 "channelCount",
    127                 "AudioDestinationNode",
    128                 "channel count (" + String::number(channelCount)
    129                 + ") must be between 1 and "
    130                 + String::number(maxChannelCount()) + "."));
    131         return;
    132     }
    133 
    134     unsigned long oldChannelCount = this->channelCount();
    135     AudioNode::setChannelCount(channelCount, exceptionState);
    136 
    137     if (!exceptionState.hadException() && this->channelCount() != oldChannelCount && isInitialized()) {
    138         // Re-create destination.
    139         m_destination->stop();
    140         createDestination();
    141         m_destination->start();
    142     }
    143 }
    144 
    145 } // namespace WebCore
    146 
    147 #endif // ENABLE(WEB_AUDIO)
    148