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

45 lines
1.5 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)
{
TrackRate sampleRate = IdealAudioRate();
ConvertTimeToTickHelper* This = static_cast<ConvertTimeToTickHelper*> (aClosure);
TrackTicks tick = This->mDestinationStream->GetCurrentPosition();
StreamTime destinationStreamTime = TicksToTimeRoundDown(sampleRate, tick);
GraphTime graphTime = This->mDestinationStream->StreamTimeToGraphTime(destinationStreamTime);
StreamTime streamTime = This->mSourceStream->GraphTimeToStreamTime(graphTime);
return TimeToTicksRoundDown(sampleRate, streamTime + SecondsToMediaTime(aTime));
}
};
void
WebAudioUtils::ConvertAudioParamToTicks(AudioParamTimeline& aParam,
AudioNodeStream* aSource,
AudioNodeStream* aDest)
{
ConvertTimeToTickHelper ctth;
ctth.mSourceStream = aSource;
ctth.mDestinationStream = aDest;
aParam.ConvertEventTimesToTicks(ConvertTimeToTickHelper::Convert, &ctth);
}
}
}