ClockCM.mm   [plain text]

/*
* Copyright (C) 2012, 2015 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#import "config.h"

#if USE(COREMEDIA)
#import "ClockCM.h"

#import <pal/avfoundation/MediaTimeAVFoundation.h>

#import "CoreMediaSoftLink.h"

using namespace PAL;

// A default time scale of 1000 allows milli-second CMTime precision without scaling the timebase.
static const int32_t DefaultTimeScale = 1000;

std::unique_ptr<Clock> Clock::create()
{
return std::make_unique<ClockCM>();
}

ClockCM::ClockCM()
: m_timebase(0)
, m_rate(1)
, m_running(false)
{
CMClockRef rawClockPtr = 0;
#if PLATFORM(IOS_FAMILY)
CMAudioClockCreate(kCFAllocatorDefault, &rawClockPtr);
#else
CMAudioDeviceClockCreate(kCFAllocatorDefault, NULL, &rawClockPtr);
#endif
RetainPtr<CMClockRef> clock = adoptCF(rawClockPtr);
initializeWithTimingSource(clock.get());
}

ClockCM::ClockCM(CMClockRef clock)
: m_timebase(0)
, m_running(false)
{
initializeWithTimingSource(clock);
}

void ClockCM::initializeWithTimingSource(CMClockRef clock)
{
CMTimebaseRef rawTimebasePtr = 0;
CMTimebaseCreateWithMasterClock(kCFAllocatorDefault, clock, &rawTimebasePtr);
m_timebase = adoptCF(rawTimebasePtr);
}

void ClockCM::setCurrentTime(double time)
{
CMTime cmTime = CMTimeMakeWithSeconds(time, DefaultTimeScale);
CMTimebaseSetTime(m_timebase.get(), cmTime);
}

double ClockCM::currentTime() const
{
CMTime cmTime = CMTimebaseGetTime(m_timebase.get());
return CMTimeGetSeconds(cmTime);
}

void ClockCM::setCurrentMediaTime(const MediaTime& time)
{
CMTimebaseSetTime(m_timebase.get(), PAL::toCMTime(time));
}

MediaTime ClockCM::currentMediaTime() const
{
return PAL::toMediaTime(CMTimebaseGetTime(m_timebase.get()));
}

void ClockCM::setPlayRate(double rate)
{
if (m_rate == rate)
return;

m_rate = rate;
if (m_running)
CMTimebaseSetRate(m_timebase.get(), rate);
}

void ClockCM::start()
{
if (m_running)
return;
m_running = true;
CMTimebaseSetRate(m_timebase.get(), m_rate);
}

void ClockCM::stop()
{
if (!m_running)
return;
m_running = false;
CMTimebaseSetRate(m_timebase.get(), 0);
}

#endif