gecko-dev/content/media/webaudio/WebAudioUtils.cpp

66 lines
2.5 KiB
C++

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