1/*
2 * Copyright (C) 2012, Intel Corporation. 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 "AudioBasicInspectorNode.h"
30
31#include "AudioNodeInput.h"
32#include "AudioNodeOutput.h"
33#include <wtf/IsoMallocInlines.h>
34
35namespace WebCore {
36
37WTF_MAKE_ISO_ALLOCATED_IMPL(AudioBasicInspectorNode);
38
39AudioBasicInspectorNode::AudioBasicInspectorNode(AudioContext& context, float sampleRate, unsigned outputChannelCount)
40 : AudioNode(context, sampleRate)
41{
42 setNodeType(NodeTypeBasicInspector);
43 addInput(std::make_unique<AudioNodeInput>(this));
44 addOutput(std::make_unique<AudioNodeOutput>(this, outputChannelCount));
45}
46
47// We override pullInputs() as an optimization allowing this node to take advantage of in-place processing,
48// where the input is simply passed through unprocessed to the output.
49// Note: this only applies if the input and output channel counts match.
50void AudioBasicInspectorNode::pullInputs(size_t framesToProcess)
51{
52 // Render input stream - try to render directly into output bus for pass-through processing where process() doesn't need to do anything...
53 input(0)->pull(output(0)->bus(), framesToProcess);
54}
55
56ExceptionOr<void> AudioBasicInspectorNode::connect(AudioNode& destination, unsigned outputIndex, unsigned inputIndex)
57{
58 ASSERT(isMainThread());
59
60 AudioContext::AutoLocker locker(context());
61
62 auto result = AudioNode::connect(destination, outputIndex, inputIndex);
63 updatePullStatus();
64 return result;
65}
66
67ExceptionOr<void> AudioBasicInspectorNode::disconnect(unsigned outputIndex)
68{
69 ASSERT(isMainThread());
70
71 AudioContext::AutoLocker locker(context());
72
73 auto result = AudioNode::disconnect(outputIndex);
74 updatePullStatus();
75 return result;
76}
77
78void AudioBasicInspectorNode::checkNumberOfChannelsForInput(AudioNodeInput* input)
79{
80 ASSERT(context().isAudioThread() && context().isGraphOwner());
81
82 ASSERT(input == this->input(0));
83 if (input != this->input(0))
84 return;
85
86 unsigned numberOfChannels = input->numberOfChannels();
87
88 if (numberOfChannels != output(0)->numberOfChannels()) {
89 // This will propagate the channel count to any nodes connected further downstream in the graph.
90 output(0)->setNumberOfChannels(numberOfChannels);
91 }
92
93 AudioNode::checkNumberOfChannelsForInput(input);
94
95 updatePullStatus();
96}
97
98void AudioBasicInspectorNode::updatePullStatus()
99{
100 ASSERT(context().isGraphOwner());
101
102 if (output(0)->isConnected()) {
103 // When an AudioBasicInspectorNode is connected to a downstream node, it will get pulled by the
104 // downstream node, thus remove it from the context's automatic pull list.
105 if (m_needAutomaticPull) {
106 context().removeAutomaticPullNode(*this);
107 m_needAutomaticPull = false;
108 }
109 } else {
110 unsigned numberOfInputConnections = input(0)->numberOfRenderingConnections();
111 if (numberOfInputConnections && !m_needAutomaticPull) {
112 // When an AudioBasicInspectorNode is not connected to any downstream node while still connected from
113 // upstream node(s), add it to the context's automatic pull list.
114 context().addAutomaticPullNode(*this);
115 m_needAutomaticPull = true;
116 } else if (!numberOfInputConnections && m_needAutomaticPull) {
117 // The AudioBasicInspectorNode is connected to nothing, remove it from the context's automatic pull list.
118 context().removeAutomaticPullNode(*this);
119 m_needAutomaticPull = false;
120 }
121 }
122}
123
124} // namespace WebCore
125
126#endif // ENABLE(WEB_AUDIO)
127