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1 /* | 1 /* |
2 * Copyright (C) 2010, Google Inc. All rights reserved. | 2 * Copyright (C) 2010, Google Inc. All rights reserved. |
3 * | 3 * |
4 * Redistribution and use in source and binary forms, with or without | 4 * Redistribution and use in source and binary forms, with or without |
5 * modification, are permitted provided that the following conditions | 5 * modification, are permitted provided that the following conditions |
6 * are met: | 6 * are met: |
7 * 1. Redistributions of source code must retain the above copyright | 7 * 1. Redistributions of source code must retain the above copyright |
8 * notice, this list of conditions and the following disclaimer. | 8 * notice, this list of conditions and the following disclaimer. |
9 * 2. Redistributions in binary form must reproduce the above copyright | 9 * 2. Redistributions in binary form must reproduce the above copyright |
10 * notice, this list of conditions and the following disclaimer in the | 10 * notice, this list of conditions and the following disclaimer in the |
11 * documentation and/or other materials provided with the distribution. | 11 * documentation and/or other materials provided with the distribution. |
12 * | 12 * |
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND AN
Y | 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND AN
Y |
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED | 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
15 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | 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 AN
Y | 16 * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR AN
Y |
17 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES | 17 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
18 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | 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 O
N | 19 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND O
N |
20 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | 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 | 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. | 22 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
23 */ | 23 */ |
24 | 24 |
25 #include "modules/webaudio/AudioDestinationNode.h" | 25 #include "modules/webaudio/AudioDestinationNode.h" |
| 26 |
26 #include "modules/webaudio/AbstractAudioContext.h" | 27 #include "modules/webaudio/AbstractAudioContext.h" |
27 #include "modules/webaudio/AudioNodeInput.h" | 28 #include "modules/webaudio/AudioNodeInput.h" |
28 #include "modules/webaudio/AudioNodeOutput.h" | 29 #include "modules/webaudio/AudioNodeOutput.h" |
29 #include "platform/audio/AudioUtilities.h" | 30 #include "platform/audio/AudioUtilities.h" |
30 #include "platform/audio/DenormalDisabler.h" | 31 #include "platform/audio/DenormalDisabler.h" |
31 #include "wtf/Atomics.h" | 32 #include "wtf/Atomics.h" |
32 | 33 |
33 namespace blink { | 34 namespace blink { |
34 | 35 |
35 AudioDestinationHandler::AudioDestinationHandler(AudioNode& node, float sampleRa
te) | 36 AudioDestinationHandler::AudioDestinationHandler(AudioNode& node, float sampleRa
te) |
36 : AudioHandler(NodeTypeDestination, node, sampleRate) | 37 : AudioHandler(NodeTypeDestination, node, sampleRate) |
37 , m_currentSampleFrame(0) | 38 , m_currentSampleFrame(0) |
38 { | 39 { |
39 addInput(); | 40 addInput(); |
40 } | 41 } |
41 | 42 |
42 AudioDestinationHandler::~AudioDestinationHandler() | 43 AudioDestinationHandler::~AudioDestinationHandler() |
43 { | 44 { |
44 ASSERT(!isInitialized()); | 45 ASSERT(!isInitialized()); |
45 } | 46 } |
46 | 47 |
47 void AudioDestinationHandler::render(AudioBus* sourceBus, AudioBus* destinationB
us, size_t numberOfFrames) | 48 void AudioDestinationHandler::render(AudioBus* sourceBus, AudioBus* destinationB
us, size_t numberOfFrames, const WebAudioTimestamp& outputTimestamp) |
48 { | 49 { |
49 // We don't want denormals slowing down any of the audio processing | 50 // We don't want denormals slowing down any of the audio processing |
50 // since they can very seriously hurt performance. | 51 // since they can very seriously hurt performance. |
51 // This will take care of all AudioNodes because they all process within thi
s scope. | 52 // This will take care of all AudioNodes because they all process within thi
s scope. |
52 DenormalDisabler denormalDisabler; | 53 DenormalDisabler denormalDisabler; |
53 | 54 |
54 // Need to check if the context actually alive. Otherwise the subsequent | 55 // Need to check if the context actually alive. Otherwise the subsequent |
55 // steps will fail. If the context is not alive somehow, return immediately | 56 // steps will fail. If the context is not alive somehow, return immediately |
56 // and do nothing. | 57 // and do nothing. |
57 // | 58 // |
58 // TODO(hongchan): because the context can go away while rendering, so this | 59 // TODO(hongchan): because the context can go away while rendering, so this |
59 // check cannot guarantee the safe execution of the following steps. | 60 // check cannot guarantee the safe execution of the following steps. |
60 ASSERT(context()); | 61 ASSERT(context()); |
61 if (!context()) | 62 if (!context()) |
62 return; | 63 return; |
63 | 64 |
64 context()->deferredTaskHandler().setAudioThreadToCurrentThread(); | 65 context()->deferredTaskHandler().setAudioThreadToCurrentThread(); |
65 | 66 |
66 // If the destination node is not initialized, pass the silence to the final | 67 // If the destination node is not initialized, pass the silence to the final |
67 // audio destination (one step before the FIFO). This check is for the case | 68 // audio destination (one step before the FIFO). This check is for the case |
68 // where the destination is in the middle of tearing down process. | 69 // where the destination is in the middle of tearing down process. |
69 if (!isInitialized()) { | 70 if (!isInitialized()) { |
70 destinationBus->zero(); | 71 destinationBus->zero(); |
71 return; | 72 return; |
72 } | 73 } |
73 | 74 |
74 // Let the context take care of any business at the start of each render qua
ntum. | 75 // Let the context take care of any business at the start of each render qua
ntum. |
75 context()->handlePreRenderTasks(); | 76 // Set the output device audio stream timestamp. |
| 77 context()->handlePreRenderTasks(outputTimestamp); |
76 | 78 |
77 // Prepare the local audio input provider for this render quantum. | 79 // Prepare the local audio input provider for this render quantum. |
78 if (sourceBus) | 80 if (sourceBus) |
79 m_localAudioInputProvider.set(sourceBus); | 81 m_localAudioInputProvider.set(sourceBus); |
80 | 82 |
81 ASSERT(numberOfInputs() >= 1); | 83 ASSERT(numberOfInputs() >= 1); |
82 if (numberOfInputs() < 1) { | 84 if (numberOfInputs() < 1) { |
83 destinationBus->zero(); | 85 destinationBus->zero(); |
84 return; | 86 return; |
85 } | 87 } |
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117 return static_cast<AudioDestinationHandler&>(handler()); | 119 return static_cast<AudioDestinationHandler&>(handler()); |
118 } | 120 } |
119 | 121 |
120 unsigned long AudioDestinationNode::maxChannelCount() const | 122 unsigned long AudioDestinationNode::maxChannelCount() const |
121 { | 123 { |
122 return audioDestinationHandler().maxChannelCount(); | 124 return audioDestinationHandler().maxChannelCount(); |
123 } | 125 } |
124 | 126 |
125 } // namespace blink | 127 } // namespace blink |
126 | 128 |
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