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
35 using namespace std;
36
37 namespace WebCore {
38
AudioSummingJunction(AudioContext * context)39 AudioSummingJunction::AudioSummingJunction(AudioContext* context)
40 : m_context(context)
41 , m_renderingStateNeedUpdating(false)
42 {
43 }
44
~AudioSummingJunction()45 AudioSummingJunction::~AudioSummingJunction()
46 {
47 if (m_renderingStateNeedUpdating && m_context.get())
48 m_context->removeMarkedSummingJunction(this);
49 }
50
changedOutputs()51 void AudioSummingJunction::changedOutputs()
52 {
53 ASSERT(context()->isGraphOwner());
54 if (!m_renderingStateNeedUpdating && canUpdateState()) {
55 context()->markSummingJunctionDirty(this);
56 m_renderingStateNeedUpdating = true;
57 }
58 }
59
updateRenderingState()60 void 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