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1 /* | 1 /* |
2 * Copyright (C) 2012, Google Inc. All rights reserved. | 2 * Copyright (C) 2012, 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 |
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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 #ifndef OfflineAudioContext_h | 25 #ifndef OfflineAudioContext_h |
26 #define OfflineAudioContext_h | 26 #define OfflineAudioContext_h |
27 | 27 |
28 #include "modules/ModulesExport.h" | 28 #include "modules/ModulesExport.h" |
29 #include "modules/webaudio/AbstractAudioContext.h" | 29 #include "modules/webaudio/AbstractAudioContext.h" |
30 | 30 |
| 31 #include "wtf/HashMap.h" |
| 32 |
31 namespace blink { | 33 namespace blink { |
32 | 34 |
33 class ExceptionState; | 35 class ExceptionState; |
| 36 class OfflineAudioDestinationHandler; |
34 | 37 |
35 class MODULES_EXPORT OfflineAudioContext final : public AbstractAudioContext { | 38 class MODULES_EXPORT OfflineAudioContext final : public AbstractAudioContext { |
36 DEFINE_WRAPPERTYPEINFO(); | 39 DEFINE_WRAPPERTYPEINFO(); |
37 public: | 40 public: |
38 static OfflineAudioContext* create(ExecutionContext*, unsigned numberOfChann
els, size_t numberOfFrames, float sampleRate, ExceptionState&); | 41 static OfflineAudioContext* create(ExecutionContext*, unsigned numberOfChann
els, size_t numberOfFrames, float sampleRate, ExceptionState&); |
39 | 42 |
40 ~OfflineAudioContext() override; | 43 ~OfflineAudioContext() override; |
41 | 44 |
| 45 DECLARE_VIRTUAL_TRACE(); |
| 46 |
42 ScriptPromise startOfflineRendering(ScriptState*); | 47 ScriptPromise startOfflineRendering(ScriptState*); |
43 | 48 |
44 ScriptPromise closeContext(ScriptState*) final; | 49 ScriptPromise closeContext(ScriptState*) final; |
| 50 ScriptPromise suspendContext(ScriptState*, double) final; |
| 51 ScriptPromise resumeContext(ScriptState*) final; |
| 52 |
| 53 // This is to implement the pure virtual method from AbstractAudioContext. |
| 54 // CANNOT be called from an OfflineAudioContext. |
45 ScriptPromise suspendContext(ScriptState*) final; | 55 ScriptPromise suspendContext(ScriptState*) final; |
46 ScriptPromise resumeContext(ScriptState*) final; | |
47 | 56 |
48 bool hasRealtimeConstraint() final { return false; } | 57 bool hasRealtimeConstraint() final { return false; } |
49 | 58 |
| 59 DEFINE_ATTRIBUTE_EVENT_LISTENER(complete); |
| 60 |
| 61 // Fire completion event when the rendering is finished. |
| 62 void fireCompletionEvent(); |
| 63 |
| 64 // This is same with the online version in AbstractAudioContext class except |
| 65 // for returning a boolean value after checking the scheduled suspends. |
| 66 bool handlePreOfflineRenderTasks(); |
| 67 |
| 68 void handlePostOfflineRenderTasks(); |
| 69 |
| 70 // Resolve a suspend scheduled at the specified frame. With this specified |
| 71 // frame as a unique key, the associated promise resolver can be retrieved |
| 72 // from the map (m_scheduledSuspends) and resolved. |
| 73 void resolveSuspendOnMainThread(size_t); |
| 74 |
| 75 // The HashMap with 'zero' key is needed because |currentSampleFrame| can be |
| 76 // zero. |
| 77 using SuspendMap = HeapHashMap<size_t, Member<ScriptPromiseResolver>, Defaul
tHash<size_t>::Hash, WTF::UnsignedWithZeroKeyHashTraits<size_t>>; |
| 78 |
| 79 using OfflineGraphAutoLocker = DeferredTaskHandler::OfflineGraphAutoLocker; |
| 80 |
50 private: | 81 private: |
51 OfflineAudioContext(Document*, unsigned numberOfChannels, size_t numberOfFra
mes, float sampleRate); | 82 OfflineAudioContext(Document*, unsigned numberOfChannels, size_t numberOfFra
mes, float sampleRate, ExceptionState&); |
| 83 |
| 84 // Fetch directly the destination handler. |
| 85 OfflineAudioDestinationHandler& destinationHandler(); |
| 86 |
| 87 AudioBuffer* renderTarget() const { return m_renderTarget.get(); } |
| 88 |
| 89 // Check if the rendering needs to be suspended. |
| 90 bool shouldSuspend(); |
| 91 |
| 92 Member<AudioBuffer> m_renderTarget; |
| 93 |
| 94 // This map is to store the timing of scheduled suspends (frame) and the |
| 95 // associated promise resolver. This storage can only be modified by the |
| 96 // main thread and accessed by the audio thread with the graph lock. |
| 97 // |
| 98 // The map is consist of key-value pairs of: |
| 99 // { size_t quantizedFrame: ScriptPromiseResolver resolver } |
| 100 // |
| 101 // Note that |quantizedFrame| is a unique key, since you can have only one |
| 102 // suspend scheduled for a certain frame. |
| 103 SuspendMap m_scheduledSuspends; |
| 104 |
| 105 Member<ScriptPromiseResolver> m_completeResolver; |
| 106 |
| 107 // This flag is necessary to indicate the rendering has actually started. |
| 108 // Note that initial state of context is 'Suspended', which is the same |
| 109 // state when the context is suspended. |
| 110 bool m_isRenderingStarted; |
| 111 |
| 112 // Total render sample length. |
| 113 size_t m_totalRenderFrames; |
52 }; | 114 }; |
53 | 115 |
54 } // namespace blink | 116 } // namespace blink |
55 | 117 |
56 #endif // OfflineAudioContext_h | 118 #endif // OfflineAudioContext_h |
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