trunk/src/Sampler.h

/***************************************************************************
 *                                                                         *
 *   LinuxSampler - modular, streaming capable sampler                     *
 *                                                                         *
 *   Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck   *
 *   Copyright (C) 2005 - 2012 Christian Schoenebeck                       *
 *                                                                         *
 *   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.                                   *
 *                                                                         *
 *   This program is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the Free Software           *
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston,                 *
 *   MA  02111-1307  USA                                                   *
 ***************************************************************************/

#ifndef __LS_SAMPLER_H__
#define __LS_SAMPLER_H__

#include <vector>
#include <map>
#include "EventListeners.h"
#include "common/global.h"
#include "common/Exception.h"
#include "engines/EngineChannel.h"
#include "drivers/midi/MidiInputDevice.h"
#include "drivers/audio/AudioOutputDevice.h"

namespace LinuxSampler {

    // just symbol prototyping
    class Sampler;

    /** @brief LinuxSampler sampler channel
     *
     * Encapsulates a channel of a specific sampler engine type, one
     * connection to a MIDI input device and one connection to an audio
     * output device. You cannot create an instance of this class on your
     * own, you have to use the AddSamplerChannel() method of the Sampler
     * object to create a new sampler channel.
     */
    class SamplerChannel {
        public:
            /**
             * Assign a sampler engine type to this sampler channel.
             *
             * @param EngineType - type of the engine to use
             * @throws Exception - if \a EngineType is invalid
             * @see Sampler::AvailableEngineTypes()
             */
            void SetEngineType(String EngineType) throw (Exception);

            /**
             * Connect this sampler channel to an audio output device, that
             * is an instance of an audio output driver. If this sampler
             * channel was already connected to an audio output device, then
             * the old connection will automatically be removed before.
             *
             * @param pDevice - audio output device to connect to
             * @throws Exception in case the audio device is tried to be
             *                   changed while the sampler channel is used by a
             *                   host plugin (e.g. VST, AU, DSSI, LV2) which
             *                   don't allow to change the audio output device
             */
            void SetAudioOutputDevice(AudioOutputDevice* pDevice) throw (Exception);

            /**
             * Connect this sampler channel to a MIDI input device.
             *
             * @param pDevice - MIDI input device to connect to
             * @throws Exception in case the MIDI device is tried to be changed
             *                   while the sampler channel is being used by a
             *                   host plugin (e.g. VST, AU, DSSI, LV2) which
             *                   don't allow to change the MIDI port or even
             *                   device
             */
            void SetMidiInputDevice(MidiInputDevice *pDevice) throw (Exception);

            /**
             * Connect this sampler channel to a MIDI input port.
             *
             * @param MidiPort - MIDI port to connect to
             * @throws Exception in case the MIDI port is tried to be changed
             *                   while the sampler channel is being used by a
             *                   host plugin (e.g. VST, AU, DSSI, LV2) which
             *                   don't allow to change the MIDI port
             */
            void SetMidiInputPort(int MidiPort) throw (Exception);

            /**
             * Define on which MIDI channel(s) this sampler channel should
             * listen to. By default, that is after creation of a new
             * sampler channel, the sampler channel will listen to all MIDI
             * channels.
             *
             * @param MidiChannel - MIDI channel to listen
             */
            void SetMidiInputChannel(midi_chan_t MidiChannel);

            /**
             * Connect this sampler channel to a MIDI input triplet.
             *
             * @param pDevice - MIDI input device to connect to
             * @param iMidiPort - MIDI port to connect to
             * @param MidiChannel - optional: MIDI channel on which the
             *                      sampler channel should listen to
             *                      (default: listen on all MIDI channels)
             * @throws Exception in case the MIDI port is tried to be changed
             *                   while the sampler channel is being used by a
             *                   host plugin (e.g. VST, AU, DSSI, LV2) which
             *                   don't allow to change the MIDI port
             */
            void SetMidiInput(MidiInputDevice* pDevice, int iMidiPort, midi_chan_t MidiChannel = midi_chan_all) throw (Exception);

            /**
             * Returns the EngineChannel object that was deployed on this
             * sampler channel appropriate to the given sampler engine type.
             *
             * @returns  pointer to engine or NULL if no engine deployed
             */
            EngineChannel* GetEngineChannel();

            /**
             * Returns the MIDI input channel to which this sampler
             * channel is currently connected to.
             *
             * @returns  The MIDI input channel on which the sampler
             *           channel is listening to.
             */
            midi_chan_t GetMidiInputChannel();

            /**
             * Returns the MIDI input port number to which this sampler
             * channel is currently connected to.
             *
             * @returns  MIDI input port number or -1 if not connected
             */
            int GetMidiInputPort();

            /**
             * Returns the audio output device to which this sampler channel
             * is currently connected to.
             *
             * @returns  pointer to audio output device or NULL if not
             *           connected
             */
            AudioOutputDevice* GetAudioOutputDevice();

            /**
             * Returns the MIDI input device to which this sampler channel
             * is currently connected to.
             *
             * @returns  pointer to MIDI input device or NULL if not
             *           connected
             */
            MidiInputDevice* GetMidiInputDevice();

            /**
             * Returns the index number of this sampler channel within the
             * Sampler instance.
             */
            uint Index();

            /** Returns the sampler to which this channel belongs */
            Sampler* GetSampler();

            ///////////////////////////////////////////////////////////////
            // Event Listener methods

            /**
             * Registers the specified listener to be notified
             * when the engine type of this sampler channel is changed.
             */
            void AddEngineChangeListener(EngineChangeListener* l);

            /**
             * Removes the specified listener.
             */
            void RemoveEngineChangeListener(EngineChangeListener* l);

            /**
             * Removes the specified listener.
             */
            void RemoveAllEngineChangeListeners();

            /**
             * Notifies listeners that the engine type of this sampler
             * channel is going to be changed soon.
             */
            void fireEngineToBeChanged();

            /**
             * Notifies listeners that the engine
             * type of this sampler channel is changed.
             */
            void fireEngineChanged();


        protected:
            SamplerChannel(Sampler* pS);
            virtual ~SamplerChannel();

            /** Getting MIDI input device port given its index number. */
            MidiInputPort* __GetMidiInputDevicePort(int iMidiPort);

            Sampler*           pSampler;
            EngineChannel*     pEngineChannel;
            AudioOutputDevice* pAudioOutputDevice;
            MidiInputDevice*   pMidiInputDevice;
            int                iIndex;

            friend class Sampler;
        private:
            int                iMidiPort;   ///< Don't access directly, read GetMidiInputPort() instead !
            midi_chan_t        midiChannel; ///< Don't access directly, read GetMidiInputChannel() instead !
            ListenerList<EngineChangeListener*> llEngineChangeListeners;
    };

    /** @brief LinuxSampler main class
     *
     * This is the toplevel class for a LinuxSampler instance.
     *
     * LinuxSampler can have arbitrary numbers of sampler channels. Each
     * sampler channel can individually be deployed with it's own sampler
     * engine, connected to an arbitrary MIDI input device and connected to
     * an arbitrary audio output device. Here an example setup:
     * @code
     * S.Channel    MIDI in    S.Engine         Audio out
     * -------------------------------------------------------------------
     *   0          Alsa   ->  gig::Engine  ->  Jack
     *   1          VSTi   ->  Akai::Engine ->  VSTi
     *   2          Jack   ->  DLS::Engine  ->  Jack
     *   3          Jack   ->  SF::Engine   ->  Alsa
     *
     * ... (and so on) ...
     * @endcode
     *
     * Note that not all audio and MIDI backends and sampler engines listed
     * in the example above might already been implemented!
     *
     * As you can see in the example setup, LinuxSampler is capable to use
     * several, different audio output and MIDI input systems
     * simultaniously at the same time. Here the example setup shown in the
     * aspect of MIDI input and audio output devices / drivers:
     * @code
     *                      ######################### #########################
     *                      # AudioOutputDeviceJack # # AudioOutputDeviceVSTi #
     *                      ######################### #########################
     *                                        ^   ^           ^
     *  /------------>|Sampler Channel 0|-----/   |           |
     *  |  /--------->|Sampler Channel 1|---------------------/
     *  |  |  /------>|Sampler Channel 2|---------/
     *  |  |  |  /--->|Sampler Channel 3|------------>#########################
     *  |  |  |  |    ... (and so on) ...             # AudioOutputDeviceAlsa #
     *  |  |  |  |                                    #########################
     *  |  |  |  \-----------------------------------------------------\
     *  |  |  \--------------------------------------------\           |
     *  |  \--------------------\                          |           |
     *  |                       |                          |           |
     * ####################### ####################### #######################
     * # MidiInputDeviceAlsa # # MidiInputDeviceVSTi # # MidiInputDeviceJack #
     * ####################### ####################### #######################
     * @endcode
     *
     * As you can see in this example setup, one device (that is midi input
     * driver / audio output driver) can be connected multiple times to
     * different sampler channels.
     *
     * It's even possible to create multiple instances of the same driver, for
     * example multiple instances of the Alsa output driver to use multiple
     * sound cards at the same time, or multiple instances of the JACK audio
     * output driver to leverage SMP systems or boxes with several hard discs.
     */
    class Sampler {
        public:
            /**
             * Constructor. Create a LinuxSampler instance.
             */
            Sampler();

            /**
             * Destructor.
             */
            virtual ~Sampler();

            /**
             * Returns the number of sampler channels currently allocated.
             */
            uint SamplerChannels();

            /**
             * Create and add a new sampler channel to this Sampler
             * instance. For race condition reasons the new channel will use
             * an index past the last already existing sampler channel
             * index (in case the index limit was not reached yet, otherwise
             * a free index starting from 0 is searched).
             *
             * @returns  pointer to new sampler channel
             */
            SamplerChannel* AddSamplerChannel();

            /**
             * Returns the sampler channel of the given sampler channel
             * index.
             *
             * @returns  pointer to sought sampler channel
             */
            SamplerChannel* GetSamplerChannel(uint uiSamplerChannel);

            /**
             * Returns all created sampler channels.
             */
            std::map<uint, SamplerChannel*> GetSamplerChannels();

            /**
             * Destroy and remove the given sampler channel from this
             * Sampler instance.
             *
             * @param pSamplerChannel - pointer to sampler channel to remove
             */
            void RemoveSamplerChannel(SamplerChannel* pSamplerChannel);

            /**
             * Destroy and remove the given sampler channel from this
             * Sampler instance.
             *
             * @param uiSamplerChannel - index of the sampler channel to
             *                           remove
             */
            void RemoveSamplerChannel(uint uiSamplerChannel);

            /**
             * Destroy and remove all sampler channels from this
             * Sampler instance.
             */
            void RemoveAllSamplerChannels();

            /**
             * Returns the names of all available audio output drivers.
             */
            std::vector<String> AvailableAudioOutputDrivers();

            /**
             * Returns the names of all available MIDI input drivers.
             */
            std::vector<String> AvailableMidiInputDrivers();

            /**
             * Returns the names of all available sampler engine types.
             * @see SamplerChannel::SetEngineType()
             */
            std::vector<String> AvailableEngineTypes();

            /**
             * Create an audio output device.
             *
             * @param AudioDriver - name of the audio driver
             * @param Parameters - eventually needed driver parameters to
             *                     create the device
             * @returns  pointer to created audio output device
             * @throws Exception  if device could not be created
             */
            AudioOutputDevice* CreateAudioOutputDevice(String AudioDriver, std::map<String,String> Parameters) throw (Exception);

            /**
             * Create a midi input device.
             *
             * @param MidiDriver - name of the midi driver
             * @param Parameters - eventually needed driver parameters to
             *                     create the device
             * @returns  pointer to created midi input device
             * @throws Exception  if device could not be created
             */
            MidiInputDevice* CreateMidiInputDevice(String MidiDriver, std::map<String,String> Parameters) throw (Exception);

            /**
             * Returns the number of all created audio output devices.
             */
            uint AudioOutputDevices();

            /**
             * Returns the number of all created MIDI input devices.
             */
            uint MidiInputDevices();

            /**
             * Returns all created audio output devices.
             */
            std::map<uint, AudioOutputDevice*> GetAudioOutputDevices();

            /**
             * Returns all created MIDI input devices.
             */
            std::map<uint, MidiInputDevice*> GetMidiInputDevices();

            /**
             * Destroy the given audio output device and takes care if there
             * are still sampler engines connected to this device, etc.
             *
             * @throws Exception  if sampler channels are still
             *                    connected to the device
             */
            void DestroyAudioOutputDevice(AudioOutputDevice* pDevice) throw (Exception);

            /**
             * Destroy all audio output devices and takes care if there
             * are still sampler engines connected to devices, etc.
             *
             * Note: non-autonomous devices, that is devices associated with
             * host plugin instances like VST, AU, DSSI, LV2 are not
             * destroyed by this method.
             *
             * @throws Exception  if sampler channels are still
             *                    connected to device
             */
            void DestroyAllAudioOutputDevices() throw (Exception);

            /**
             * Destroy the given MIDI input device and takes care if there
             * are still sampler engines connected to this device, etc.
             *
             * @throws Exception  if sampler channels are still
             *                    connected to the device
             */
            void DestroyMidiInputDevice(MidiInputDevice* pDevice) throw (Exception);

            /**
             * Destroy all MIDI input devices and take care if there
             * are still sampler engines connected to device, etc.
             *
             * Note: non-autonomous devices, that is devices associated with
             * host plugin instances like VST, AU, DSSI, LV2 are not
             * destroyed by this method.
             *
             * @throws Exception  if sampler channels are still
             *                    connected to device
             */
            void DestroyAllMidiInputDevices() throw (Exception);

             /**
             * Gets the current number of all active streams.
             * @returns The current number of all active streams.
             */
            int GetDiskStreamCount();

            /**
             * Gets the current number of all active voices.
             * @returns The current number of all active voices.
             */
            int GetVoiceCount();

            /**
             * @see SetGlobalMaxVoices()
             */
            int GetGlobalMaxVoices();

            /**
             * @see SetGlobalMaxStreams()
             */
            int GetGlobalMaxStreams();

            /**
             * Sets the global maximum amount limit of voices.
             *
             * Note that this voice limit can also be altered for
             * each sampler engine instance individually instead.
             *
             * @throws Exception  if \a n is invalid
             */
            void SetGlobalMaxVoices(int n) throw (Exception);

            /**
             * Sets the global maximum amount limit of disk streams.
             *
             * Note that this stream limit can also be altered for
             * each sampler engine instance individually instead.
                         *
             * @throws Exception  if \a n is invalid
             */
            void SetGlobalMaxStreams(int n) throw (Exception);

            /**
             * Reset the whole sampler. Destroy all engines, sampler
             * channels, MIDI input devices and audio output devices.
             */
            void Reset();

            ///////////////////////////////////////////////////////////////
            // Event Listener methods

            /**
             * Registers the specified listener to be notified
             * when the number of sampler chanels is changed.
             */
            void AddChannelCountListener(ChannelCountListener* l);

            /**
             * Removes the specified listener.
             */
            void RemoveChannelCountListener(ChannelCountListener* l);

            /**
             * Registers the specified listener to be notified
             * when the number of audio output devices is changed.
             */
            void AddAudioDeviceCountListener(AudioDeviceCountListener* l);

            /**
             * Removes the specified listener.
             */
            void RemoveAudioDeviceCountListener(AudioDeviceCountListener* l);

            /**
             * Registers the specified listener to be notified
             * when the number of MIDI input devices is changed.
             */
            void AddMidiDeviceCountListener(MidiDeviceCountListener* l);

            /**
             * Removes the specified listener.
             */
            void RemoveMidiDeviceCountListener(MidiDeviceCountListener* l);

            /**
             * Registers the specified listener to be notified when the number
             * of active voices in a particular sampler channel is changed.
             */
            void AddVoiceCountListener(VoiceCountListener* l);

            /**
             * Removes the specified listener.
             */
            void RemoveVoiceCountListener(VoiceCountListener* l);

            /**
             * Notifies listeners that the number of active voices
             * on the specified sampler channel is changed.
             * @param ChannelId The numerical ID of the sampler channel.
             * @param NewCount The new number of active voices.
             */
            void fireVoiceCountChanged(int ChannelId, int NewCount);

            /**
             * Registers the specified listener to be notified when the number
             * of active disk streams in a particular sampler channel is changed.
             */
            void AddStreamCountListener(StreamCountListener* l);

            /**
             * Removes the specified listener.
             */
            void RemoveStreamCountListener(StreamCountListener* l);

            /**
             * Notifies listeners that the number of active disk streams
             * on the specified sampler channel is changed.
             * @param ChannelId The numerical ID of the sampler channel.
             * @param NewCount The new number of active disk streams.
             */
            void fireStreamCountChanged(int ChannelId, int NewCount);

            /**
             * Registers the specified listener to be
             * notified when the fill state of the disk stream
             * buffers on a specific sampler channel is changed.
             */
            void AddBufferFillListener(BufferFillListener* l);

            /**
             * Removes the specified listener.
             */
            void RemoveBufferFillListener(BufferFillListener* l);

            /**
             * Notifies listeners that the fill state of the disk stream
             * buffers on the specified sampler channel is changed.
             * @param ChannelId The numerical ID of the sampler channel.
             * @param FillData The buffer fill data for the specified sampler channel.
             */
            void fireBufferFillChanged(int ChannelId, String FillData);

            /**
             * Registers the specified listener to be notified
             * when total number of active voices is changed.
             */
            void AddTotalVoiceCountListener(TotalVoiceCountListener* l);

            /**
             * Removes the specified listener.
             */
            void RemoveTotalVoiceCountListener(TotalVoiceCountListener* l);

            /**
             * Notifies listeners that the total number of active voices is changed.
             * @param NewCount The new number of active voices.
             */
            void fireTotalVoiceCountChanged(int NewCount);

            /**
             * Registers the specified listener to be notified when the number
             * of total streams is changed.
             */
            void AddTotalStreamCountListener(TotalStreamCountListener* l);

            /**
             * Removes the specified listener.
             */
            void RemoveTotalStreamCountListener(TotalStreamCountListener* l);

            /**
             * Notifies listeners that the total number of total streams changed.
             * @param NewCount The new number of total streams.
             */
            void fireTotalStreamCountChanged(int NewCount);

            /**
             * Registers the specified listener to be notified when the number
             * of effect sends on a particular sampler channel is changed.
             */
            void AddFxSendCountListener(FxSendCountListener* l);

            /**
             * Removes the specified listener.
             */
            void RemoveFxSendCountListener(FxSendCountListener* l);

            /**
             * Notifies listeners about the current number of voices,
             * streams and total voices, and the current fill state of
             * the disk stream buffers.
             */
            void fireStatistics();

            ///////////////////////////////////////////////////////////////
            // system specific methods

            /**
             * Advise the FPU to treat denormal floating point numbers as
             * zero, to avoid severe performance penalty when dealing with
             * such extreme floating point values.
             *
             * @returns @c true if FPU supports it, @c false otherwise
             */
            static bool EnableDenormalsAreZeroMode();

#if defined(WIN32)
            /**
             * Gets the directory where the liblinuxsampler dll is located.
             * Note: this method is currently only available for Windows.
             * @returns installation directory
             */
            static String GetInstallDir();
#endif
        protected:
            /**
             * Notifies listeners that the number of sampler channels has been changed.
             * @param NewCount The new number of sampler channels.
             */
            void fireChannelCountChanged(int NewCount);

            /**
             * Notifies listeners that the specified sampler channel has just
             * been added.
             * @param pChannel The new sampler channel.
             */
            void fireChannelAdded(SamplerChannel* pChannel);

            /**
             * Notifies listeners that the specified sampler channel is
             * going to be removed soon.
             * @param pChannel sampler channel to be removed.
             */
            void fireChannelToBeRemoved(SamplerChannel* pChannel);

            /**
             * Notifies listeners that the number of audio output devices has been changed.
             * @param NewCount The new number of audio output devices.
             */
            void fireAudioDeviceCountChanged(int NewCount);

            /**
             * Notifies listeners that the number of MIDI input devices has been changed.
             * @param NewCount The new number of MIDI input devices.
             */
            void fireMidiDeviceCountChanged(int NewCount);

            /**
             * Notifies listeners that the supplied MIDI input device is
             * going to be destroyed soon.
             * @param pDevice MIDI input device to be destroyed
             */
            void fireMidiDeviceToBeDestroyed(MidiInputDevice* pDevice);

            /**
             * Notifies listeners that the supplied MIDI input device was
             * just created.
             * @param pDevice new MIDI input device 
             */
            void fireMidiDeviceCreated(MidiInputDevice* pDevice);

            /**
             * Notifies listeners that the number of effect sends
             * on a particular sampler channel is changed.
             * @param ChannelId The numerical ID of the sampler channel.
             * @param NewCount The new number of sampler channels.
             */
            void fireFxSendCountChanged(int ChannelId, int NewCount);

            typedef std::map<uint, SamplerChannel*> SamplerChannelMap;

            SamplerChannelMap mSamplerChannels; ///< contains all created sampler channels

            // statistics cache
            uint uiOldTotalVoiceCount;
            uint uiOldTotalStreamCount;
            std::map<uint, uint> mOldVoiceCounts;
            std::map<uint, uint> mOldStreamCounts;

            friend class SamplerChannel;

        private:
            ListenerList<ChannelCountListener*> llChannelCountListeners;
            ListenerList<AudioDeviceCountListener*> llAudioDeviceCountListeners;
            ListenerList<MidiDeviceCountListener*> llMidiDeviceCountListeners;
            ListenerList<VoiceCountListener*> llVoiceCountListeners;
            ListenerList<StreamCountListener*> llStreamCountListeners;
            ListenerList<BufferFillListener*> llBufferFillListeners;
            ListenerList<TotalStreamCountListener*> llTotalStreamCountListeners;
            ListenerList<TotalVoiceCountListener*> llTotalVoiceCountListeners;
            ListenerList<FxSendCountListener*> llFxSendCountListeners;

            class EventHandler : public EngineChangeListener, public FxSendCountListener {
                public:
                    void SetSampler(Sampler* pSampler) { this->pSampler = pSampler; }

                    /**
                     * Invoked when the engine type of the specified sampler
                     * channel is going to be changed soon.
                     * @param ChannelId The numerical ID of the sampler channel
                     */
                    virtual void EngineToBeChanged(int ChannelId);

                    /**
                     * Invoked when the engine type of the
                     * specified sampler channel is changed.
                     * @param ChannelId The numerical ID of the sampler
                     * channel, which engine type has been changed.
                     */
                    virtual void EngineChanged(int ChannelId);

                    /**
                     * Invoked when the number of effect sends
                     * on the specified sampler channel has changed.
                     * @param ChannelId The numerical ID of the sampler channel.
                     * @param NewCount The new number of effect sends.
                     */
                    virtual void FxSendCountChanged(int ChannelId, int NewCount);

                private:
                    Sampler* pSampler;
            } eventHandler;
    };
}

#endif // __LS_SAMPLER_H__