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/*******************************************************************************
* Copyright 2009-2016 Jörg Müller
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
******************************************************************************/
#include "CoreAudioSynchronizer.h"
#include "CoreAudioDevice.h"
#include "Exception.h"
AUD_NAMESPACE_BEGIN
CoreAudioSynchronizer::CoreAudioSynchronizer(AudioUnit& audio_unit) :
m_clock_ref(nullptr),
m_playing(false)
{
OSStatus status = CAClockNew(0, &m_clock_ref);
if(status != noErr)
AUD_THROW(DeviceException, "Could not create a CoreAudio clock.");
CAClockTimebase timebase = kCAClockTimebase_AudioOutputUnit;
status = CAClockSetProperty(m_clock_ref, kCAClockProperty_InternalTimebase, sizeof(timebase), &timebase);
if(status != noErr)
{
CAClockDispose(m_clock_ref);
AUD_THROW(DeviceException, "Could not create a CoreAudio clock.");
}
status = CAClockSetProperty(m_clock_ref, kCAClockProperty_TimebaseSource, sizeof(audio_unit), &audio_unit);
if(status != noErr)
{
CAClockDispose(m_clock_ref);
AUD_THROW(DeviceException, "Could not create a CoreAudio clock.");
}
CAClockSyncMode sync_mode = kCAClockSyncMode_Internal;
status = CAClockSetProperty(m_clock_ref, kCAClockProperty_SyncMode, sizeof(sync_mode), &sync_mode);
if(status != noErr)
{
CAClockDispose(m_clock_ref);
AUD_THROW(DeviceException, "Could not create a CoreAudio clock.");
}
}
CoreAudioSynchronizer::~CoreAudioSynchronizer()
{
CAClockDispose(m_clock_ref);
}
void CoreAudioSynchronizer::seek(std::shared_ptr<IHandle> handle, double time)
{
if(m_playing)
CAClockStop(m_clock_ref);
CAClockTime clock_time;
clock_time.format = kCAClockTimeFormat_Seconds;
clock_time.time.seconds = time;
CAClockSetCurrentTime(m_clock_ref, &clock_time);
handle->seek(time);
if(m_playing)
CAClockStart(m_clock_ref);
}
double CoreAudioSynchronizer::getPosition(std::shared_ptr<IHandle> handle)
{
CAClockTime clock_time;
OSStatus status;
if(m_playing)
status = CAClockGetCurrentTime(m_clock_ref, kCAClockTimeFormat_Seconds, &clock_time);
else
status = CAClockGetStartTime(m_clock_ref, kCAClockTimeFormat_Seconds, &clock_time);
if(status != noErr)
return 0;
return clock_time.time.seconds;
}
void CoreAudioSynchronizer::play()
{
if(m_playing)
return;
m_playing = true;
CAClockStart(m_clock_ref);
}
void CoreAudioSynchronizer::stop()
{
if(!m_playing)
return;
m_playing = false;
CAClockStop(m_clock_ref);
}
void CoreAudioSynchronizer::setSyncCallback(ISynchronizer::syncFunction function, void* data)
{
}
int CoreAudioSynchronizer::isPlaying()
{
return m_playing;
}
AUD_NAMESPACE_END
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