/**
* used by the cacheAudioEventsForMeasure-method, this collects
* all AudioEvents in the requested measure for entry into the BulkCacher
*
* @param bufferPosition {int} the desired measures buffers start pointer
* @param bufferEnd {int} the desired measures buffers end pointer
*
* @return {std::vector<BaseCacheableAudioEvent*>}
*/
std::vector<BaseCacheableAudioEvent*>* collectCacheableSequencerEvents( int bufferPosition, int bufferEnd )
{
std::vector<BaseCacheableAudioEvent*>* events = new std::vector<BaseCacheableAudioEvent*>();
for ( int i = 0, l = instruments.size(); i < l; ++i )
{
std::vector<BaseAudioEvent*>* audioEvents = instruments.at( i )->getEvents();
int amount = audioEvents->size();
for ( int j = 0; j < amount; j++ )
{
BaseAudioEvent* audioEvent = audioEvents->at( j );
// if event is an instance of BaseCacheableAudioEvent add it to the list
if ( dynamic_cast<BaseCacheableAudioEvent*>( audioEvent ) != NULL )
{
int sampleStart = audioEvent->getSampleStart();
int sampleEnd = audioEvent->getSampleEnd();
if (( sampleStart >= bufferPosition && sampleStart <= bufferEnd ) ||
( sampleStart < bufferPosition && sampleEnd >= bufferPosition ))
{
if ( !audioEvent->deletable())
events->push_back(( BaseCacheableAudioEvent* ) audioEvent );
}
}
}
}
return events;
}
void collectLiveEvents( BaseInstrument* instrument )
{
AudioChannel* channel = instrument->audioChannel;
std::vector<BaseAudioEvent*>* liveEvents = instrument->getLiveEvents();
// removal queue
std::vector<BaseAudioEvent*> removes;
int i = 0;
for ( i; i < liveEvents->size(); i++ )
{
BaseAudioEvent* audioEvent = liveEvents->at( i );
if ( !audioEvent->deletable())
channel->addLiveEvent( audioEvent );
else
removes.push_back( audioEvent );
}
// removal queue filled ? process it so we can safely
// remove "deleted" AudioEvents without errors occurring
if ( removes.size() > 0 )
{
int i = 0;
for ( i; i < removes.size(); i++ )
{
BaseAudioEvent* audioEvent = removes[ i ];
// remove audio event from the list
if ( std::find( liveEvents->begin(), liveEvents->end(), audioEvent ) != liveEvents->end())
{
liveEvents->erase( std::find( liveEvents->begin(), liveEvents->end(), audioEvent ));
}
instrument->removeEvent( audioEvent );
}
}
}
/**
* used by the getAudioEvents-method of the sequencer, this validates
* the present AudioEvents against the requested position
* and updates and flushes the removal queue
*
* @param instrument {BaseInstrument*} instrument to gather events from
* @param bufferPosition {int} the current buffers start pointer
* @param bufferEnd {int} the current buffers end pointer
*/
void collectSequencedEvents( BaseInstrument* instrument, int bufferPosition, int bufferEnd )
{
if ( !instrument->hasEvents() )
return;
AudioChannel* channel = instrument->audioChannel;
std::vector<BaseAudioEvent*>* audioEvents = instrument->getEvents();
// removal queue
std::vector<BaseAudioEvent*> removes;
// channel has an internal loop (e.g. drum machine) ? recalculate requested
// buffer position by subtracting all measures above the first
if ( channel->maxBufferPosition > 0 )
{
int bytesPerBar = AudioEngine::bytes_per_bar;
while ( bufferPosition >= channel->maxBufferPosition )
{
bufferPosition -= bytesPerBar;
bufferEnd -= bytesPerBar;
}
}
int i = 0, amount = audioEvents->size();
for ( i; i < amount; i++ )
{
BaseAudioEvent* audioEvent = audioEvents->at( i );
if ( audioEvent->isEnabled() )
{
int sampleStart = audioEvent->getSampleStart();
int sampleEnd = audioEvent->getSampleEnd();
if ( audioEvent->getLoopeable() ||
( sampleStart >= bufferPosition && sampleStart <= bufferEnd ) ||
( sampleStart < bufferPosition && sampleEnd >= bufferPosition ))
{
if ( !audioEvent->deletable())
channel->addEvent( audioEvent );
else
removes.push_back( audioEvent );
}
}
}
// removal queue filled ? process it so we can safely
// remove "deleted" AudioEvents without errors occurring
if ( removes.size() > 0 )
{
int i = 0;
for ( i; i < removes.size(); i++ )
{
BaseAudioEvent* audioEvent = removes[ i ];
// remove audio event from the instruments event list
if ( std::find( audioEvents->begin(), audioEvents->end(), audioEvent ) != audioEvents->end())
{
audioEvents->erase( std::find( audioEvents->begin(), audioEvents->end(), audioEvent ));
}
instrument->removeEvent( audioEvent );
}
}
}