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comparison: content/media/webaudio/AudioParamTimeline.h
content/media/webaudio/AudioParamTimeline.h
- branch
- TOR_BUG_9701
- changeset 8
- 97036ab72558
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| -1:000000000000 | 0:152a1951b5d9 |
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| 1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ | |
| 2 /* vim:set ts=2 sw=2 sts=2 et cindent: */ | |
| 3 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 4 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 6 | |
| 7 #ifndef AudioParamTimeline_h_ | |
| 8 #define AudioParamTimeline_h_ | |
| 9 | |
| 10 #include "AudioEventTimeline.h" | |
| 11 #include "mozilla/ErrorResult.h" | |
| 12 #include "nsAutoPtr.h" | |
| 13 #include "MediaStreamGraph.h" | |
| 14 #include "AudioSegment.h" | |
| 15 | |
| 16 namespace mozilla { | |
| 17 | |
| 18 namespace dom { | |
| 19 | |
| 20 // This helper class is used to represent the part of the AudioParam | |
| 21 // class that gets sent to AudioNodeEngine instances. In addition to | |
| 22 // AudioEventTimeline methods, it holds a pointer to an optional | |
| 23 // MediaStream which represents the AudioNode inputs to the AudioParam. | |
| 24 // This MediaStream is managed by the AudioParam subclass on the main | |
| 25 // thread, and can only be obtained from the AudioNodeEngine instances | |
| 26 // consuming this class. | |
| 27 class AudioParamTimeline : public AudioEventTimeline<ErrorResult> | |
| 28 { | |
| 29 typedef AudioEventTimeline<ErrorResult> BaseClass; | |
| 30 | |
| 31 public: | |
| 32 explicit AudioParamTimeline(float aDefaultValue) | |
| 33 : BaseClass(aDefaultValue) | |
| 34 { | |
| 35 } | |
| 36 | |
| 37 MediaStream* Stream() const | |
| 38 { | |
| 39 return mStream; | |
| 40 } | |
| 41 | |
| 42 bool HasSimpleValue() const | |
| 43 { | |
| 44 return BaseClass::HasSimpleValue() && !mStream; | |
| 45 } | |
| 46 | |
| 47 // Get the value of the AudioParam at time aTime + aCounter. | |
| 48 // aCounter here is an offset to aTime if we try to get the value in ticks, | |
| 49 // otherwise it should always be zero. aCounter is meant to be used when | |
| 50 // getting the value of an a-rate AudioParam for each tick inside an | |
| 51 // AudioNodeEngine implementation. | |
| 52 template<class TimeType> | |
| 53 float GetValueAtTime(TimeType aTime, size_t aCounter = 0); | |
| 54 | |
| 55 virtual size_t SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const | |
| 56 { | |
| 57 return mStream ? mStream->SizeOfIncludingThis(aMallocSizeOf) : 0; | |
| 58 } | |
| 59 | |
| 60 virtual size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const | |
| 61 { | |
| 62 return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf); | |
| 63 } | |
| 64 | |
| 65 | |
| 66 private: | |
| 67 float AudioNodeInputValue(size_t aCounter) const; | |
| 68 | |
| 69 protected: | |
| 70 // This is created lazily when needed. | |
| 71 nsRefPtr<MediaStream> mStream; | |
| 72 }; | |
| 73 | |
| 74 template<> inline float | |
| 75 AudioParamTimeline::GetValueAtTime(double aTime, size_t aCounter) | |
| 76 { | |
| 77 MOZ_ASSERT(!aCounter); | |
| 78 | |
| 79 // Getting an AudioParam value on an AudioNode does not consider input from | |
| 80 // other AudioNodes, which is managed only on the graph thread. | |
| 81 return BaseClass::GetValueAtTime(aTime); | |
| 82 } | |
| 83 | |
| 84 | |
| 85 template<> inline float | |
| 86 AudioParamTimeline::GetValueAtTime(int64_t aTime, size_t aCounter) | |
| 87 { | |
| 88 MOZ_ASSERT(aCounter < WEBAUDIO_BLOCK_SIZE); | |
| 89 MOZ_ASSERT(!aCounter || !HasSimpleValue()); | |
| 90 | |
| 91 // Mix the value of the AudioParam itself with that of the AudioNode inputs. | |
| 92 return BaseClass::GetValueAtTime(static_cast<int64_t>(aTime + aCounter)) + | |
| 93 (mStream ? AudioNodeInputValue(aCounter) : 0.0f); | |
| 94 } | |
| 95 | |
| 96 } | |
| 97 } | |
| 98 | |
| 99 #endif | |
| 100 |
