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