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/*
Rosegarden
A sequencer and musical notation editor.
This program is Copyright 2000-2008
Guillaume Laurent <glaurent@telegraph-road.org>,
Chris Cannam <cannam@all-day-breakfast.com>,
Richard Bown <bownie@bownie.com>
The moral right of the authors to claim authorship of this work
has been asserted.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version. See the file
COPYING included with this distribution for more information.
*/
#ifndef _AUDIO_PLAY_QUEUE_H_
#define _AUDIO_PLAY_QUEUE_H_
#include "RealTime.h"
#include "Instrument.h"
#include <set>
#include <vector>
#include <map>
#include <list>
namespace Rosegarden
{
class PlayableAudioFile;
/**
* An ordered list of PlayableAudioFiles that does not aim to be quick
* to add to or remove files from, but that aims to quickly answer the
* question of which files are playing within a given time slice.
*
* Note that there is no locking between audio file add/remove and
* lookup. Add/remove should only be carried out when it is known
* that no threads will be performing lookup.
*/
class AudioPlayQueue
{
public:
AudioPlayQueue();
virtual ~AudioPlayQueue();
struct FileTimeCmp {
bool operator()(const PlayableAudioFile &, const PlayableAudioFile &) const;
bool operator()(const PlayableAudioFile *, const PlayableAudioFile *) const;
};
typedef std::set<PlayableAudioFile *, FileTimeCmp> FileSet;
typedef std::list<PlayableAudioFile *> FileList;
/**
* Add a file to the queue. AudioPlayQueue takes ownership of the
* file and will delete it when removed.
*/
void addScheduled(PlayableAudioFile *file);
/**
* Add a file to the unscheduled list. AudioPlayQueue takes
* ownership of the file and will delete it when removed.
* Unscheduled files will be returned along with schuled ones for
* normal lookups, but everything will be less efficient when
* there are unscheduled files on the queue. This is intended
* for asynchronous (preview) playback.
*/
void addUnscheduled(PlayableAudioFile *file);
/**
* Remove a scheduled or unscheduled file from the queue and
* delete it.
*/
void erase(PlayableAudioFile *file);
/**
* Remove all files and delete them.
*/
void clear();
/**
* Return true if the queue is empty.
*/
bool empty() const;
/**
* Return the total number of files in the queue. (May be slow.)
*/
size_t size() const;
/**
* Look up the files playing during a given slice and return them
* in the passed FileSet. The pointers returned are still owned
* by me and the caller should not delete them.
*/
void getPlayingFiles(const RealTime &sliceStart,
const RealTime &sliceDuration,
FileSet &) const;
/**
* Look up the files playing during a given slice on a given
* instrument and return them in the passed array. The size arg
* gives the available size of the array and is used to return the
* number of file pointers written. The pointers returned are
* still owned by me and the caller should not delete them.
*/
void getPlayingFilesForInstrument(const RealTime &sliceStart,
const RealTime &sliceDuration,
InstrumentId instrumentId,
PlayableAudioFile **files,
size_t &size) const;
/**
* Return true if at least one scheduled or unscheduled file is
* associated with the given instrument somewhere in the queue.
*/
bool haveFilesForInstrument(InstrumentId instrumentId) const;
/**
* Return a (shared reference to an) ordered set of all files on
* the scheduled queue.
*/
const FileSet &getAllScheduledFiles() const;
/**
* Return a (shared reference to an) ordered set of all files on
* the unscheduled queue.
*/
const FileList &getAllUnscheduledFiles() const;
/**
* Get an approximate (but always pessimistic) estimate of the
* number of ring buffers required for the current queue -- that
* is, the maximum possible number of audio channels playing at
* once from non-small-file-cached-files.
*/
size_t getMaxBuffersRequired() const { return m_maxBuffers; }
private:
FileSet m_files;
typedef std::vector<PlayableAudioFile *> FileVector;
typedef std::map<int, FileVector> ReverseFileMap;
ReverseFileMap m_index;
typedef std::vector<ReverseFileMap> InstrumentReverseFileMap;
InstrumentReverseFileMap m_instrumentIndex;
FileList m_unscheduled;
typedef std::map<int, size_t> FileCountMap;
FileCountMap m_counts;
size_t m_maxBuffers;
};
}
#endif
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