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
37namespace blink {
38
39DefaultAudioDestinationNode::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
49DefaultAudioDestinationNode::~DefaultAudioDestinationNode()
50{
51    ASSERT(!isInitialized());
52}
53
54void DefaultAudioDestinationNode::dispose()
55{
56    uninitialize();
57    AudioDestinationNode::dispose();
58}
59
60void DefaultAudioDestinationNode::initialize()
61{
62    ASSERT(isMainThread());
63    if (isInitialized())
64        return;
65
66    createDestination();
67    AudioNode::initialize();
68}
69
70void 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
82void 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
90void DefaultAudioDestinationNode::startRendering()
91{
92    ASSERT(isInitialized());
93    if (isInitialized())
94        m_destination->start();
95}
96
97unsigned long DefaultAudioDestinationNode::maxChannelCount() const
98{
99    return AudioDestination::maxChannelCount();
100}
101
102void 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