content/media/webaudio/AudioParamTimeline.h@97036ab72558 (annotated)
content/media/webaudio/AudioParamTimeline.h
Tue, 06 Jan 2015 21:39:09 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Tue, 06 Jan 2015 21:39:09 +0100
- branch
- TOR_BUG_9701
- changeset 8
- 97036ab72558
- permissions
- -rw-r--r--
Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.
| michael@0 | 1 | /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ |
| michael@0 | 2 | /* vim:set ts=2 sw=2 sts=2 et cindent: */ |
| michael@0 | 3 | /* This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 4 | * License, v. 2.0. If a copy of the MPL was not distributed with this |
| michael@0 | 5 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 6 | |
| michael@0 | 7 | #ifndef AudioParamTimeline_h_ |
| michael@0 | 8 | #define AudioParamTimeline_h_ |
| michael@0 | 9 | |
| michael@0 | 10 | #include "AudioEventTimeline.h" |
| michael@0 | 11 | #include "mozilla/ErrorResult.h" |
| michael@0 | 12 | #include "nsAutoPtr.h" |
| michael@0 | 13 | #include "MediaStreamGraph.h" |
| michael@0 | 14 | #include "AudioSegment.h" |
| michael@0 | 15 | |
| michael@0 | 16 | namespace mozilla { |
| michael@0 | 17 | |
| michael@0 | 18 | namespace dom { |
| michael@0 | 19 | |
| michael@0 | 20 | // This helper class is used to represent the part of the AudioParam |
| michael@0 | 21 | // class that gets sent to AudioNodeEngine instances. In addition to |
| michael@0 | 22 | // AudioEventTimeline methods, it holds a pointer to an optional |
| michael@0 | 23 | // MediaStream which represents the AudioNode inputs to the AudioParam. |
| michael@0 | 24 | // This MediaStream is managed by the AudioParam subclass on the main |
| michael@0 | 25 | // thread, and can only be obtained from the AudioNodeEngine instances |
| michael@0 | 26 | // consuming this class. |
| michael@0 | 27 | class AudioParamTimeline : public AudioEventTimeline<ErrorResult> |
| michael@0 | 28 | { |
| michael@0 | 29 | typedef AudioEventTimeline<ErrorResult> BaseClass; |
| michael@0 | 30 | |
| michael@0 | 31 | public: |
| michael@0 | 32 | explicit AudioParamTimeline(float aDefaultValue) |
| michael@0 | 33 | : BaseClass(aDefaultValue) |
| michael@0 | 34 | { |
| michael@0 | 35 | } |
| michael@0 | 36 | |
| michael@0 | 37 | MediaStream* Stream() const |
| michael@0 | 38 | { |
| michael@0 | 39 | return mStream; |
| michael@0 | 40 | } |
| michael@0 | 41 | |
| michael@0 | 42 | bool HasSimpleValue() const |
| michael@0 | 43 | { |
| michael@0 | 44 | return BaseClass::HasSimpleValue() && !mStream; |
| michael@0 | 45 | } |
| michael@0 | 46 | |
| michael@0 | 47 | // Get the value of the AudioParam at time aTime + aCounter. |
| michael@0 | 48 | // aCounter here is an offset to aTime if we try to get the value in ticks, |
| michael@0 | 49 | // otherwise it should always be zero. aCounter is meant to be used when |
| michael@0 | 50 | // getting the value of an a-rate AudioParam for each tick inside an |
| michael@0 | 51 | // AudioNodeEngine implementation. |
| michael@0 | 52 | template<class TimeType> |
| michael@0 | 53 | float GetValueAtTime(TimeType aTime, size_t aCounter = 0); |
| michael@0 | 54 | |
| michael@0 | 55 | virtual size_t SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const |
| michael@0 | 56 | { |
| michael@0 | 57 | return mStream ? mStream->SizeOfIncludingThis(aMallocSizeOf) : 0; |
| michael@0 | 58 | } |
| michael@0 | 59 | |
| michael@0 | 60 | virtual size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const |
| michael@0 | 61 | { |
| michael@0 | 62 | return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf); |
| michael@0 | 63 | } |
| michael@0 | 64 | |
| michael@0 | 65 | |
| michael@0 | 66 | private: |
| michael@0 | 67 | float AudioNodeInputValue(size_t aCounter) const; |
| michael@0 | 68 | |
| michael@0 | 69 | protected: |
| michael@0 | 70 | // This is created lazily when needed. |
| michael@0 | 71 | nsRefPtr<MediaStream> mStream; |
| michael@0 | 72 | }; |
| michael@0 | 73 | |
| michael@0 | 74 | template<> inline float |
| michael@0 | 75 | AudioParamTimeline::GetValueAtTime(double aTime, size_t aCounter) |
| michael@0 | 76 | { |
| michael@0 | 77 | MOZ_ASSERT(!aCounter); |
| michael@0 | 78 | |
| michael@0 | 79 | // Getting an AudioParam value on an AudioNode does not consider input from |
| michael@0 | 80 | // other AudioNodes, which is managed only on the graph thread. |
| michael@0 | 81 | return BaseClass::GetValueAtTime(aTime); |
| michael@0 | 82 | } |
| michael@0 | 83 | |
| michael@0 | 84 | |
| michael@0 | 85 | template<> inline float |
| michael@0 | 86 | AudioParamTimeline::GetValueAtTime(int64_t aTime, size_t aCounter) |
| michael@0 | 87 | { |
| michael@0 | 88 | MOZ_ASSERT(aCounter < WEBAUDIO_BLOCK_SIZE); |
| michael@0 | 89 | MOZ_ASSERT(!aCounter || !HasSimpleValue()); |
| michael@0 | 90 | |
| michael@0 | 91 | // Mix the value of the AudioParam itself with that of the AudioNode inputs. |
| michael@0 | 92 | return BaseClass::GetValueAtTime(static_cast<int64_t>(aTime + aCounter)) + |
| michael@0 | 93 | (mStream ? AudioNodeInputValue(aCounter) : 0.0f); |
| michael@0 | 94 | } |
| michael@0 | 95 | |
| michael@0 | 96 | } |
| michael@0 | 97 | } |
| michael@0 | 98 | |
| michael@0 | 99 | #endif |
| michael@0 | 100 |
