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232 lines
6.3 KiB
232 lines
6.3 KiB
/* alsaout.cpp - class AlsaOut which represents an alsa client/port pair
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This file is part of LibKMid 0.9.5
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Copyright (C) 1997,98,99,2000 Antonio Larrosa Jimenez
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LibKMid's homepage : http://www.arrakis.es/~rlarrosa/libtdemid.html
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library 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 GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public License
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along with this library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA.
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Send comments and bug fixes to Antonio Larrosa <larrosa@kde.org>
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***************************************************************************/
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#ifndef _ALSAOUT_H
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#define _ALSAOUT_H
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#include <libtdemid/midiout.h>
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struct snd_seq_event;
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typedef struct snd_seq_event snd_seq_event_t;
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/**
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* @short Sends MIDI events to a MIDI devices using ALSA
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* @version 0.9.5 17/01/2000
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* @author Antonio Larrosa Jimenez <larrosa@kde.org>
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*/
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class AlsaOut : public MidiOut
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{
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friend class DeviceManager;
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protected:
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/**
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* @internal
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* Total number of devices.
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*/
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int ndevs;
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/**
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* @internal
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* Total number of midi ports
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*/
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int nmidiports;
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double count;
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double lastcount;
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double lasttime;
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double begintime;
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int m_rate;
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/**
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* @internal
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* A "constant" used to convert from milliseconds to the computer rate
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*/
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double convertrate;
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long int time;
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virtual void seqbuf_dump (void);
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virtual void seqbuf_clean(void);
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void eventInit(snd_seq_event_t *ev);
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void eventSend(snd_seq_event_t *ep);
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void timerEventSend(int type);
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public:
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/**
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* Constructor. After constructing a MidiOut device, you must open it
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* (using openDev() ). Additionally you may want to initialize it
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* (with initDev() ),
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*/
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AlsaOut(int d, int client=64, int port=0, const char *cname="", const char *pname="");
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/**
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* Destructor. It doesn't matter if you close the device ( closeDev() )
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* before you destruct the object because in other case, it will be closed
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* here.
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*/
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virtual ~AlsaOut();
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/**
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* Opens the device. This is generally called from DeviceManager , so you
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* shouldn't call this yourself (except if you created the MidiOut object
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* yourself.
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* @param sqfd a file descriptor of /dev/sequencer
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* @see closeDev
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* @see initDev
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*/
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virtual void openDev (int sqfd);
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/**
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* Closes the device. It basically tells the device (the file descriptor)
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* is going to be closed.
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* @see openDev
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*/
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virtual void closeDev ();
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/**
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* Initializes the device sending generic standard midi events and controllers,
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* such as changing the patches of each channel to an Acoustic Piano (000),
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* setting the volume to a normal value, etc.
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*/
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virtual void initDev ();
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/**
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* @return the device type of the object. This is to identify the
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* inherited class that a given object is polymorphed to.
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* The returned value is one of these :
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*
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* @li KMID_EXTERNAL_MIDI if it's a MidiOut object
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* @li KMID_SYNTH if it's a SynthOut object (as an AWE device)
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* @li KMID_FM if it's a FMOut object
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* @li KMID_GUS if it's a GUSOut object
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*
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* which are defined in midispec.h
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*
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* @see deviceName
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*/
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int deviceType () const { return devicetype; }
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/**
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* Returns the name and type of this MIDI device.
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* @see deviceType
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*/
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virtual const char * deviceName (void) const;
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/**
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* @internal
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*/
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int rate (void) { return m_rate; }
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/**
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* See DeviceManager::noteOn()
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*/
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virtual void noteOn ( uchar chn, uchar note, uchar vel );
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/**
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* See DeviceManager::noteOff()
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*/
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virtual void noteOff ( uchar chn, uchar note, uchar vel );
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/**
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* See DeviceManager::keyPressure()
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*/
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virtual void keyPressure ( uchar chn, uchar note, uchar vel );
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/**
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* See DeviceManager::chnPatchChange()
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*/
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virtual void chnPatchChange ( uchar chn, uchar patch );
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/**
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* See DeviceManager::chnPressure()
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*/
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virtual void chnPressure ( uchar chn, uchar vel );
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/**
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* See DeviceManager::chnPitchBender()
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*/
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virtual void chnPitchBender ( uchar chn, uchar lsb, uchar msb );
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/**
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* See DeviceManager::chnController()
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*/
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virtual void chnController ( uchar chn, uchar ctl , uchar v );
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/**
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* See DeviceManager::sysex()
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*/
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virtual void sysex ( uchar *data,ulong size);
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/**
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* Mutes all notes being played on a given channel.
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*/
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virtual void channelSilence ( uchar chn );
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/**
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* Mute or "unmute" a given channel .
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* @param chn channel to work on
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* @param b if true, the device will ignore subsequent notes played on the chn
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* channel, and mute all notes being played on it. If b is false, the channel
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* is back to work.
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*/
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virtual void channelMute ( uchar chn, int b );
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/**
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* Change all channel volume events multiplying it by this percentage correction
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* Instead of forcing a channel to a fixed volume, this method allows to
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* music to fade out even when it was being played softly.
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* @param volper is an integer value, where 0 is quiet, 100 is used to send
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* an unmodified value, 200 play music twice louder than it should, etc.
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*/
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virtual void setVolumePercentage ( int volper )
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{ volumepercentage = volper; }
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/**
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* Returns true if everything's ok and false if there has been any problem
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*/
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int ok (void)
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{ if (seqfd<0) return 0;
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return (_ok>0);
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}
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virtual void wait (double ticks);
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virtual void tmrSetTempo (int v);
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virtual void tmrStart (int tpcn);
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virtual void tmrStart () { tmrStart(-1); }
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virtual void tmrStop ();
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virtual void tmrContinue ();
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/**
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* @internal
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* If i==1 syncronizes by cleaning the buffer instead of sending it (in fact,
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* this is what synchronizing really means :-) )
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*/
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void sync (int i=0);
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class AlsaOutPrivate;
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AlsaOutPrivate *di;
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};
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#endif // _ALSAOUT_H
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