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1 // Copyright 2015 The Chromium Authors. All rights reserved. | 1 // Copyright 2015 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "modules/webaudio/AudioContext.h" | 5 #include "modules/webaudio/AudioContext.h" |
6 | 6 |
7 #include "bindings/core/v8/ExceptionMessages.h" | 7 #include "bindings/core/v8/ExceptionMessages.h" |
8 #include "bindings/core/v8/ExceptionState.h" | 8 #include "bindings/core/v8/ExceptionState.h" |
9 #include "bindings/core/v8/ScriptPromiseResolver.h" | 9 #include "bindings/core/v8/ScriptPromiseResolver.h" |
10 #include "core/dom/DOMException.h" | 10 #include "core/dom/DOMException.h" |
11 #include "core/dom/ExceptionCode.h" | 11 #include "core/dom/ExceptionCode.h" |
12 #include "core/frame/UseCounter.h" | 12 #include "core/frame/UseCounter.h" |
13 #include "modules/webaudio/AudioBufferCallback.h" | 13 #include "modules/webaudio/AudioBufferCallback.h" |
| 14 #include "modules/webaudio/AudioContextOptions.h" |
| 15 #include "modules/webaudio/DefaultAudioDestinationNode.h" |
14 #include "platform/Histogram.h" | 16 #include "platform/Histogram.h" |
15 #include "platform/audio/AudioUtilities.h" | 17 #include "platform/audio/AudioUtilities.h" |
| 18 #include "public/platform/WebAudioLatencyHint.h" |
16 | 19 |
17 #if DEBUG_AUDIONODE_REFERENCES | 20 #if DEBUG_AUDIONODE_REFERENCES |
18 #include <stdio.h> | 21 #include <stdio.h> |
19 #endif | 22 #endif |
20 | 23 |
21 namespace blink { | 24 namespace blink { |
22 | 25 |
23 // Don't allow more than this number of simultaneous AudioContexts | 26 // Don't allow more than this number of simultaneous AudioContexts |
24 // talking to hardware. | 27 // talking to hardware. |
25 const unsigned MaxHardwareContexts = 6; | 28 const unsigned MaxHardwareContexts = 6; |
26 static unsigned s_hardwareContextCount = 0; | 29 static unsigned s_hardwareContextCount = 0; |
27 static unsigned s_contextId = 0; | 30 static unsigned s_contextId = 0; |
28 | 31 |
29 AudioContext* AudioContext::create(Document& document, | 32 AudioContext* AudioContext::create(Document& document, |
| 33 const AudioContextOptions& contextOptions, |
30 ExceptionState& exceptionState) { | 34 ExceptionState& exceptionState) { |
31 DCHECK(isMainThread()); | 35 DCHECK(isMainThread()); |
32 | 36 |
33 UseCounter::countCrossOriginIframe(document, | 37 UseCounter::countCrossOriginIframe(document, |
34 UseCounter::AudioContextCrossOriginIframe); | 38 UseCounter::AudioContextCrossOriginIframe); |
35 | 39 |
36 if (s_hardwareContextCount >= MaxHardwareContexts) { | 40 if (s_hardwareContextCount >= MaxHardwareContexts) { |
37 exceptionState.throwDOMException( | 41 exceptionState.throwDOMException( |
38 NotSupportedError, ExceptionMessages::indexExceedsMaximumBound( | 42 NotSupportedError, ExceptionMessages::indexExceedsMaximumBound( |
39 "number of hardware contexts", | 43 "number of hardware contexts", |
40 s_hardwareContextCount, MaxHardwareContexts)); | 44 s_hardwareContextCount, MaxHardwareContexts)); |
41 return nullptr; | 45 return nullptr; |
42 } | 46 } |
43 | 47 |
44 AudioContext* audioContext = new AudioContext(document); | 48 WebAudioLatencyHint latencyHint(WebAudioLatencyHint::CategoryInteractive); |
| 49 if (contextOptions.latencyHint().isAudioContextLatencyCategory()) { |
| 50 latencyHint = WebAudioLatencyHint( |
| 51 contextOptions.latencyHint().getAsAudioContextLatencyCategory()); |
| 52 } |
| 53 // TODO: add support for latencyHint().isDouble() |
| 54 |
| 55 AudioContext* audioContext = new AudioContext(document, latencyHint); |
45 audioContext->suspendIfNeeded(); | 56 audioContext->suspendIfNeeded(); |
46 | 57 |
47 if (!AudioUtilities::isValidAudioBufferSampleRate( | 58 if (!AudioUtilities::isValidAudioBufferSampleRate( |
48 audioContext->sampleRate())) { | 59 audioContext->sampleRate())) { |
49 exceptionState.throwDOMException( | 60 exceptionState.throwDOMException( |
50 NotSupportedError, | 61 NotSupportedError, |
51 ExceptionMessages::indexOutsideRange( | 62 ExceptionMessages::indexOutsideRange( |
52 "hardware sample rate", audioContext->sampleRate(), | 63 "hardware sample rate", audioContext->sampleRate(), |
53 AudioUtilities::minAudioBufferSampleRate(), | 64 AudioUtilities::minAudioBufferSampleRate(), |
54 ExceptionMessages::InclusiveBound, | 65 ExceptionMessages::InclusiveBound, |
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76 ("WebAudio.AudioContext.MaxChannelsAvailable")); | 87 ("WebAudio.AudioContext.MaxChannelsAvailable")); |
77 DEFINE_STATIC_LOCAL(SparseHistogram, sampleRateHistogram, | 88 DEFINE_STATIC_LOCAL(SparseHistogram, sampleRateHistogram, |
78 ("WebAudio.AudioContext.HardwareSampleRate")); | 89 ("WebAudio.AudioContext.HardwareSampleRate")); |
79 maxChannelCountHistogram.sample( | 90 maxChannelCountHistogram.sample( |
80 audioContext->destination()->maxChannelCount()); | 91 audioContext->destination()->maxChannelCount()); |
81 sampleRateHistogram.sample(audioContext->sampleRate()); | 92 sampleRateHistogram.sample(audioContext->sampleRate()); |
82 | 93 |
83 return audioContext; | 94 return audioContext; |
84 } | 95 } |
85 | 96 |
86 AudioContext::AudioContext(Document& document) | 97 AudioContext::AudioContext(Document& document, |
87 : BaseAudioContext(&document), m_contextId(s_contextId++) {} | 98 const WebAudioLatencyHint& latencyHint) |
| 99 : BaseAudioContext(&document), m_contextId(s_contextId++) { |
| 100 m_destinationNode = DefaultAudioDestinationNode::create(this, latencyHint); |
| 101 initialize(); |
| 102 } |
88 | 103 |
89 AudioContext::~AudioContext() { | 104 AudioContext::~AudioContext() { |
90 #if DEBUG_AUDIONODE_REFERENCES | 105 #if DEBUG_AUDIONODE_REFERENCES |
91 fprintf(stderr, "[%16p]: AudioContext::~AudioContext(): %u\n", this, | 106 fprintf(stderr, "[%16p]: AudioContext::~AudioContext(): %u\n", this, |
92 m_contextId); | 107 m_contextId); |
93 #endif | 108 #endif |
94 } | 109 } |
95 | 110 |
96 DEFINE_TRACE(AudioContext) { | 111 DEFINE_TRACE(AudioContext) { |
97 visitor->trace(m_closeResolver); | 112 visitor->trace(m_closeResolver); |
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198 DCHECK(isMainThread()); | 213 DCHECK(isMainThread()); |
199 DCHECK(destination()); | 214 DCHECK(destination()); |
200 | 215 |
201 if (contextState() == Running) { | 216 if (contextState() == Running) { |
202 destination()->audioDestinationHandler().stopRendering(); | 217 destination()->audioDestinationHandler().stopRendering(); |
203 setContextState(Suspended); | 218 setContextState(Suspended); |
204 deferredTaskHandler().clearHandlersToBeDeleted(); | 219 deferredTaskHandler().clearHandlersToBeDeleted(); |
205 } | 220 } |
206 } | 221 } |
207 | 222 |
| 223 double AudioContext::baseLatency() const { |
| 224 return framesPerBuffer() * 2 / static_cast<double>(sampleRate()); |
| 225 } |
| 226 |
208 } // namespace blink | 227 } // namespace blink |
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