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196 lines
5.9 KiB
C++
196 lines
5.9 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#ifndef AUDIO_MIDIPLAYER_H
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#define AUDIO_MIDIPLAYER_H
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#include "common/scummsys.h"
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#include "common/mutex.h"
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#include "audio/mididrv.h"
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class MidiParser;
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namespace Audio {
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/**
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* @defgroup audio_midiplayer MIDI player
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* @ingroup audio
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*
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* @brief MidiPlayer class for playing MIDI sounds.
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* @{
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*/
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/**
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* Simple MIDI playback class.
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*
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* @note Currently incomplete, as it lacks play() methods. This is just a
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* start of the real thing, which tries to include code replicated between
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* several of our engines.
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*
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* Eventually, this should offer ways to start playback of SMF and XMIDI
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* data (and possibly make it easy to add further playback methods),
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* should be able to automatically instantiate _driver as needed,
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* should perform memory management on the MidiParser object(s) being
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* used, and possibly more.
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*
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* Also, pause/resume handling should be unified (we provide an implementation,
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* but several subclasses use different ones).
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*
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* Also, care should be taken to ensure that mutex locking is done right.
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*
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* @todo Document origin of this class. It is based on code shared by
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* several engines (e.g. DRACI says it copied it from MADE, which took
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* it from SAGE).
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*/
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class MidiPlayer : public MidiDriver_BASE {
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public:
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MidiPlayer();
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~MidiPlayer();
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// TODO: Implement ways to actually play stuff
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//virtual void play(TODO);
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// TODO: Document these
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virtual void stop();
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virtual void pause();
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virtual void resume();
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/**
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* Return whether there is currently any MIDI music playing.
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*
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* @todo There is a subtle difference between the semantics of this in
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* various subclasses, related to paused music: Namely, should this
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* function return true or false if a MIDI song is currently loaded,
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* but paused? In the base implementation of pause/resume, "false"
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* will be returned (that is, it is not possible to distinguish between
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* nothing being played, and an active but paused MIDI tune).
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* But in several subclasses (e.g. in HUGO), there is a separate _paused
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* variable, which is used to pause playback, and for these, "true"
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* will be returned.
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* And in SAGA, isPlaying is overwritten to return the value
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* of _parser->isPlaying() (which should amount to "true" in the
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* described situation).
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* We really should unify this and clearly define the desired
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* semantics of this method.
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*/
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bool isPlaying() const { return _isPlaying; }
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/**
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* Return the currently active master volume, in the range 0-255.
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*/
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int getVolume() const { return _masterVolume; }
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/**
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* Set the master volume to the specified value in the range 0-255.
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* (values outside this range are automatically clipped).
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* This may cause suitable MIDI events to be sent to active channels.
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*
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* @todo This method currently does not do anything if the new volume
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* matches the old volume. But some engines always update the
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* volume (Parallaction, Tinsel, Touche, ...). This is why
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* this method is currently virtual. We really should figure
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* which way to do it, and then make this the default, and make
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* this method non-virtual again.
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*/
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virtual void setVolume(int volume);
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/**
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* Update the volume according to the ConfMan's 'music_volume'
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* setting. also respects the 'mute' setting.
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*/
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void syncVolume();
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// TODO: Document this
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bool hasNativeMT32() const { return _nativeMT32; }
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// MidiDriver_BASE implementation
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void send(uint32 b) override;
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void metaEvent(byte type, byte *data, uint16 length) override;
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protected:
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/**
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* This method is invoked by the default send() implementation,
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* after suitably filtering the message b.
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*/
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virtual void sendToChannel(byte ch, uint32 b);
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/**
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* This method is invoked by metaEvent when an end-of-track
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* event arrives. By default, this tells the parser
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* to jump to the start (if looping is enabled) resp.
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* invokes stope():
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* Overload this to customize behavior.
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*/
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virtual void endOfTrack();
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// TODO: Document this
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virtual void onTimer();
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static void timerCallback(void *data);
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void createDriver(int flags = MDT_MIDI | MDT_ADLIB | MDT_PREFER_GM);
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protected:
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enum {
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/**
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* The number of MIDI channels supported.
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*/
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kNumChannels = 16
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};
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Common::Mutex _mutex;
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MidiDriver *_driver;
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/**
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* A MidiParser instances, to be created by methods of a MidiPlayer
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* subclass.
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* @note The stop() method (and hence the destructor) invoke the
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* unloadMusic() method of _parser and then delete it.
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*/
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MidiParser *_parser;
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/**
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* This is an (optional) pointer to a malloc'ed buffer containing
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* MIDI data used by _parser. The stop() method (and hence the
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* destructor) will free this if set.
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* Subclasses of this class may use _midiData, but don't have to
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*/
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byte *_midiData;
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MidiChannel *_channelsTable[kNumChannels];
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uint8 _channelsVolume[kNumChannels];
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bool _isLooping;
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bool _isPlaying;
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/**
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* The master volume, in the range 0-255.
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*/
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int _masterVolume; // FIXME: byte or int ?
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bool _nativeMT32;
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};
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/** @} */
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} // End of namespace Audio
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#endif
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