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