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/AudioSummingJunction.h"
30
31#include "modules/webaudio/AudioContext.h"
32#include "modules/webaudio/AudioNodeOutput.h"
33#include <algorithm>
34
35namespace blink {
36
37AudioSummingJunction::AudioSummingJunction(AudioContext* context)
38    : m_context(context)
39    , m_renderingStateNeedUpdating(false)
40    , m_didCallDispose(false)
41{
42    ASSERT(context);
43    m_context->registerLiveAudioSummingJunction(*this);
44}
45
46void AudioSummingJunction::dispose()
47{
48    m_didCallDispose = true;
49    m_context->removeMarkedSummingJunction(this);
50}
51
52AudioSummingJunction::~AudioSummingJunction()
53{
54}
55
56void AudioSummingJunction::trace(Visitor* visitor)
57{
58    visitor->trace(m_context);
59}
60
61void AudioSummingJunction::changedOutputs()
62{
63    ASSERT(context()->isGraphOwner());
64    if (!m_renderingStateNeedUpdating && !m_didCallDispose) {
65        context()->markSummingJunctionDirty(this);
66        m_renderingStateNeedUpdating = true;
67    }
68}
69
70void AudioSummingJunction::updateRenderingState()
71{
72    ASSERT(context()->isAudioThread() && context()->isGraphOwner());
73    if (m_renderingStateNeedUpdating) {
74        // Copy from m_outputs to m_renderingOutputs.
75        m_renderingOutputs.resize(m_outputs.size());
76        unsigned j = 0;
77        for (HashSet<AudioNodeOutput*>::iterator i = m_outputs.begin(); i != m_outputs.end(); ++i, ++j) {
78            AudioNodeOutput* output = *i;
79            m_renderingOutputs[j] = output;
80            output->updateRenderingState();
81        }
82
83        didUpdate();
84
85        m_renderingStateNeedUpdating = false;
86    }
87}
88
89} // namespace blink
90
91#endif // ENABLE(WEB_AUDIO)
92