зеркало из https://github.com/mozilla/gecko-dev.git
66 строки
2.5 KiB
C++
66 строки
2.5 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=2 sw=2 sts=2 et cindent: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "WebAudioUtils.h"
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#include "AudioNodeStream.h"
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namespace mozilla {
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namespace dom {
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struct ConvertTimeToTickHelper
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{
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AudioNodeStream* mSourceStream;
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AudioNodeStream* mDestinationStream;
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static int64_t Convert(double aTime, void* aClosure)
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{
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ConvertTimeToTickHelper* This = static_cast<ConvertTimeToTickHelper*> (aClosure);
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MOZ_ASSERT(This->mSourceStream->SampleRate() == This->mDestinationStream->SampleRate());
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return WebAudioUtils::ConvertDestinationStreamTimeToSourceStreamTime(
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aTime, This->mSourceStream, This->mDestinationStream);
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}
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};
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TrackTicks
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WebAudioUtils::ConvertDestinationStreamTimeToSourceStreamTime(double aTime,
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AudioNodeStream* aSource,
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MediaStream* aDestination)
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{
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StreamTime streamTime = std::max<MediaTime>(0, SecondsToMediaTime(aTime));
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GraphTime graphTime = aDestination->StreamTimeToGraphTime(streamTime);
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StreamTime thisStreamTime = aSource->GraphTimeToStreamTimeOptimistic(graphTime);
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TrackTicks ticks = TimeToTicksRoundUp(aSource->SampleRate(), thisStreamTime);
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return ticks;
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}
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double
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WebAudioUtils::StreamPositionToDestinationTime(TrackTicks aSourcePosition,
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AudioNodeStream* aSource,
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AudioNodeStream* aDestination)
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{
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MOZ_ASSERT(aSource->SampleRate() == aDestination->SampleRate());
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StreamTime sourceTime = TicksToTimeRoundDown(aSource->SampleRate(), aSourcePosition);
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GraphTime graphTime = aSource->StreamTimeToGraphTime(sourceTime);
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StreamTime destinationTime = aDestination->GraphTimeToStreamTimeOptimistic(graphTime);
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return MediaTimeToSeconds(destinationTime);
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}
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void
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WebAudioUtils::ConvertAudioParamToTicks(AudioParamTimeline& aParam,
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AudioNodeStream* aSource,
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AudioNodeStream* aDest)
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{
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MOZ_ASSERT(!aSource || aSource->SampleRate() == aDest->SampleRate());
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ConvertTimeToTickHelper ctth;
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ctth.mSourceStream = aSource;
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ctth.mDestinationStream = aDest;
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aParam.ConvertEventTimesToTicks(ConvertTimeToTickHelper::Convert, &ctth, aDest->SampleRate());
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}
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}
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}
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