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