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