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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 |
(...skipping 10 matching lines...) Expand all Loading... | |
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; | |
37 | |
38 // The HashMap with 'zero' key is needed because |currentSampleFrame| can be | |
39 // zero. | |
40 using SuspendMap = HeapHashMap<size_t, Member<ScriptPromiseResolver>, DefaultHas h<size_t>::Hash, WTF::UnsignedWithZeroKeyHashTraits<size_t>>; | |
34 | 41 |
35 class MODULES_EXPORT OfflineAudioContext final : public AbstractAudioContext { | 42 class MODULES_EXPORT OfflineAudioContext final : public AbstractAudioContext { |
36 DEFINE_WRAPPERTYPEINFO(); | 43 DEFINE_WRAPPERTYPEINFO(); |
37 public: | 44 public: |
38 static OfflineAudioContext* create(ExecutionContext*, unsigned numberOfChann els, size_t numberOfFrames, float sampleRate, ExceptionState&); | 45 static OfflineAudioContext* create(ExecutionContext*, unsigned numberOfChann els, size_t numberOfFrames, float sampleRate, ExceptionState&); |
39 | 46 |
40 ~OfflineAudioContext() override; | 47 ~OfflineAudioContext() override; |
41 | 48 |
49 DECLARE_VIRTUAL_TRACE(); | |
50 | |
42 ScriptPromise startOfflineRendering(ScriptState*); | 51 ScriptPromise startOfflineRendering(ScriptState*); |
43 | 52 |
44 ScriptPromise closeContext(ScriptState*) final; | 53 ScriptPromise closeContext(ScriptState*) final; |
54 ScriptPromise suspendContext(ScriptState*, double) final; | |
55 ScriptPromise resumeContext(ScriptState*) final; | |
56 | |
57 // This is to implement the pure virtual method from AbstractAudioContext. | |
58 // CANNOT be called from an OfflineAudioContext. | |
45 ScriptPromise suspendContext(ScriptState*) final; | 59 ScriptPromise suspendContext(ScriptState*) final; |
46 ScriptPromise resumeContext(ScriptState*) final; | |
47 | 60 |
48 bool hasRealtimeConstraint() final { return false; } | 61 bool hasRealtimeConstraint() final { return false; } |
49 | 62 |
63 DEFINE_ATTRIBUTE_EVENT_LISTENER(complete); | |
64 | |
65 // Fire completion event when the rendering is suspended. | |
66 void fireSuspendedEvent(); | |
67 | |
68 // Fire completion event when the rendering is finished. | |
69 void fireCompletionEvent(); | |
70 | |
71 // This is same with the online version in AbstractAudioContext class except | |
72 // for returning a boolean value after checking the scheduled suspends. | |
73 bool handlePreOfflineRenderTasks(); | |
74 | |
75 void handlePostOfflineRenderTasks(); | |
76 | |
77 // Resolve a suspend scheduled at the specified frame. With this specified | |
78 // frame as a unique key, the associated promise resolver can be retrieved | |
79 // from the map (m_scheduledSuspends) and resolved. | |
80 void resolveSuspendOnMainThread(size_t); | |
81 | |
50 private: | 82 private: |
51 OfflineAudioContext(Document*, unsigned numberOfChannels, size_t numberOfFra mes, float sampleRate); | 83 OfflineAudioContext(Document*, unsigned numberOfChannels, size_t numberOfFra mes, float sampleRate); |
84 | |
85 // Fetch directly the destination handler. | |
86 OfflineAudioDestinationHandler& destinationHandler(); | |
87 | |
88 AudioBuffer* renderTarget() const { return m_renderTarget.get(); } | |
89 | |
90 // Check if the rendering needs to be suspended. | |
91 bool shouldSuspend(); | |
92 | |
93 Member<AudioBuffer> m_renderTarget; | |
94 | |
95 // This map is to store the timing of scheduled suspends (frame) and the | |
96 // associated promise resolver. This storage can only be modified by the | |
97 // main thread and accessed by the audio thread with the graph lock. | |
Raymond Toy
2015/10/21 18:22:45
Add comment on what the key is and the value in th
hongchan
2015/10/22 18:23:49
Done.
| |
98 SuspendMap m_scheduledSuspends; | |
99 | |
100 Member<ScriptPromiseResolver> m_completeResolver; | |
101 | |
102 // This flag is necessary to indicate the rendering has actually started. | |
103 // Note that initial state of context is 'Suspended', which is the same | |
104 // state when the context is suspended. | |
105 bool m_isRenderingStarted; | |
106 | |
107 // Total render sample length. | |
108 size_t m_totalRenderFrames; | |
52 }; | 109 }; |
53 | 110 |
54 } // namespace blink | 111 } // namespace blink |
55 | 112 |
56 #endif // OfflineAudioContext_h | 113 #endif // OfflineAudioContext_h |
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