engines/gig/EngineChannel.cpp

/***************************************************************************
 *                                                                         *
 *   LinuxSampler - modular, streaming capable sampler                     *
 *                                                                         *
 *   Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck   *
 *   Copyright (C) 2005 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                                                   *
 ***************************************************************************/

#include "EngineChannel.h"

namespace LinuxSampler { namespace gig {    

    EngineChannel::EngineChannel() {
        pMIDIKeyInfo = new midi_key_info_t[128];
        pEngine      = NULL;
        pInstrument  = NULL;
        pEventQueue  = new RingBuffer<Event>(MAX_EVENTS_PER_FRAGMENT, 0);        
        pActiveKeys  = new Pool<uint>(128);
        for (uint i = 0; i < 128; i++) {
            pMIDIKeyInfo[i].pActiveVoices  = NULL; // we allocate when we retrieve the right Engine object
            pMIDIKeyInfo[i].KeyPressed     = false;
            pMIDIKeyInfo[i].Active         = false;
            pMIDIKeyInfo[i].ReleaseTrigger = false;
            pMIDIKeyInfo[i].pEvents        = NULL; // we allocate when we retrieve the right Engine object
        }
        InstrumentIdx  = -1;
        InstrumentStat = -1;
        AudioDeviceChannelLeft  = -1;
        AudioDeviceChannelRight = -1;
    }

    EngineChannel::~EngineChannel() {
        if (pInstrument) Engine::instruments.HandBack(pInstrument, this);
        for (uint i = 0; i < 128; i++) {
            if (pMIDIKeyInfo[i].pActiveVoices) {
                pMIDIKeyInfo[i].pActiveVoices->clear();
                delete pMIDIKeyInfo[i].pActiveVoices;
            }
            if (pMIDIKeyInfo[i].pEvents) {
                pMIDIKeyInfo[i].pEvents->clear();
                delete pMIDIKeyInfo[i].pEvents;
            }
        }
        if (pEventQueue) delete pEventQueue;
        if (pActiveKeys) delete pActiveKeys;
        if (pMIDIKeyInfo) delete[] pMIDIKeyInfo;
    }

    /**
     * This method is not thread safe!
     */
    void EngineChannel::ResetInternal() {
        Pitch               = 0;
        SustainPedal        = false;
        GlobalVolume        = 1.0;
        CurrentKeyDimension = 0;

        // set all MIDI controller values to zero
        memset(ControllerTable, 0x00, 128);

        // reset key info
        for (uint i = 0; i < 128; i++) {
            if (pMIDIKeyInfo[i].pActiveVoices)
                pMIDIKeyInfo[i].pActiveVoices->clear();
            if (pMIDIKeyInfo[i].pEvents)
                pMIDIKeyInfo[i].pEvents->clear();
            pMIDIKeyInfo[i].KeyPressed     = false;
            pMIDIKeyInfo[i].Active         = false;
            pMIDIKeyInfo[i].ReleaseTrigger = false;
            pMIDIKeyInfo[i].itSelf         = Pool<uint>::Iterator();
        }

        // reset all key groups
        std::map<uint,uint*>::iterator iter = ActiveKeyGroups.begin();
        for (; iter != ActiveKeyGroups.end(); iter++) iter->second = NULL;

        // free all active keys
        pActiveKeys->clear();

        // delete all input events
        pEventQueue->init();

        if (pEngine) pEngine->ResetInternal();
    }

    int EngineChannel::RenderAudio(uint Samples) {
        return (pEngine) ? pEngine->RenderAudio(this, Samples) : 0;
    }

    LinuxSampler::Engine* EngineChannel::GetEngine() {
        return pEngine;
    }

    /**
     * More or less a workaround to set the instrument name, index and load
     * status variable to zero percent immediately, that is without blocking
     * the calling thread. It might be used in future for other preparations
     * as well though.
     *
     * @param FileName   - file name of the Gigasampler instrument file
     * @param Instrument - index of the instrument in the .gig file
     * @see LoadInstrument()
     */
    void EngineChannel::PrepareLoadInstrument(const char* FileName, uint Instrument) {
        InstrumentFile = FileName;
        InstrumentIdx  = Instrument;
        InstrumentStat = 0;
    }

    /**
     * Load an instrument from a .gig file. PrepareLoadInstrument() has to
     * be called first to provide the information which instrument to load.
     * This method will then actually start to load the instrument and block
     * the calling thread until loading was completed.
     *
     * @returns detailed description of the method call result
     * @see PrepareLoadInstrument()
     */
    void EngineChannel::LoadInstrument() {

        if (pEngine) pEngine->DisableAndLock();
        
        ResetInternal();
        
        // free old instrument
        if (pInstrument) {
            // give old instrument back to instrument manager
            Engine::instruments.HandBack(pInstrument, this);
        }

        // delete all key groups
        ActiveKeyGroups.clear();

        // request gig instrument from instrument manager
        try {
            instrument_id_t instrid;
            instrid.FileName    = InstrumentFile;
            instrid.iInstrument = InstrumentIdx;
            pInstrument = Engine::instruments.Borrow(instrid, this);
            if (!pInstrument) {
                InstrumentStat = -1;
                dmsg(1,("no instrument loaded!!!\n"));
                exit(EXIT_FAILURE);
            }
        }
        catch (RIFF::Exception e) {
            InstrumentStat = -2;
            String msg = "gig::Engine error: Failed to load instrument, cause: " + e.Message;
            throw LinuxSamplerException(msg);
        }
        catch (InstrumentResourceManagerException e) {
            InstrumentStat = -3;
            String msg = "gig::Engine error: Failed to load instrument, cause: " + e.Message();
            throw LinuxSamplerException(msg);
        }
        catch (...) {
            InstrumentStat = -4;
            throw LinuxSamplerException("gig::Engine error: Failed to load instrument, cause: Unknown exception while trying to parse gig file.");
        }

        // rebuild ActiveKeyGroups map with key groups of current instrument
        for (::gig::Region* pRegion = pInstrument->GetFirstRegion(); pRegion; pRegion = pInstrument->GetNextRegion())
            if (pRegion->KeyGroup) ActiveKeyGroups[pRegion->KeyGroup] = NULL;

        InstrumentIdxName = pInstrument->pInfo->Name;
        InstrumentStat = 100;

        // inform audio driver for the need of two channels
        try {
            if (pEngine && pEngine->pAudioOutputDevice)
                pEngine->pAudioOutputDevice->AcquireChannels(2); // gig Engine only stereo
        }
        catch (AudioOutputException e) {
            String msg = "Audio output device unable to provide 2 audio channels, cause: " + e.Message();
            throw LinuxSamplerException(msg);
        }

        if (pEngine) pEngine->Enable();
    }

    /**
     * Will be called by the InstrumentResourceManager when the instrument
     * we are currently using in this engine is going to be updated, so we
     * can stop playback before that happens.
     */
    void EngineChannel::ResourceToBeUpdated(::gig::Instrument* pResource, void*& pUpdateArg) {
        dmsg(3,("gig::Engine: Received instrument update message.\n"));
        if (pEngine) pEngine->DisableAndLock();
        ResetInternal();
        this->pInstrument = NULL;
    }

    /**
     * Will be called by the InstrumentResourceManager when the instrument
     * update process was completed, so we can continue with playback.
     */
    void EngineChannel::ResourceUpdated(::gig::Instrument* pOldResource, ::gig::Instrument* pNewResource, void* pUpdateArg) {
        this->pInstrument = pNewResource; //TODO: there are couple of engine parameters we should update here as well if the instrument was updated (see LoadInstrument())
        if (pEngine) pEngine->Enable();
    }

    void EngineChannel::Connect(AudioOutputDevice* pAudioOut) {        
        pEngine = Engine::AcquireEngine(this, pAudioOut);
        ResetInternal();        
        for (uint i = 0; i < 128; i++) {
            pMIDIKeyInfo[i].pActiveVoices = new RTList<Voice>(pEngine->pVoicePool);
            pMIDIKeyInfo[i].pEvents       = new RTList<Event>(pEngine->pEventPool);
        }
        AudioDeviceChannelLeft  = 0;
        AudioDeviceChannelRight = 1;
        pOutputLeft             = pAudioOut->Channel(0)->Buffer();
        pOutputRight            = pAudioOut->Channel(1)->Buffer();
    }

    void EngineChannel::DisconnectAudioOutputDevice() {
        if (pEngine) { // if clause to prevent disconnect loops
            ResetInternal();
            for (uint i = 0; i < 128; i++) {
                if (pMIDIKeyInfo[i].pActiveVoices) delete pMIDIKeyInfo[i].pActiveVoices;
                if (pMIDIKeyInfo[i].pEvents)       delete pMIDIKeyInfo[i].pEvents;
            }
            Engine* oldEngine = pEngine;
            AudioOutputDevice* oldAudioDevice = pEngine->pAudioOutputDevice;
            pEngine = NULL;
            Engine::FreeEngine(this, oldAudioDevice);
            AudioDeviceChannelLeft  = -1;
            AudioDeviceChannelRight = -1;
            oldAudioDevice->Disconnect(this);
        }
    }

    void EngineChannel::SetOutputChannel(uint EngineAudioChannel, uint AudioDeviceChannel) {
        if (!pEngine || !pEngine->pAudioOutputDevice) throw AudioOutputException("No audio output device connected yet.");
        
        AudioChannel* pChannel = pEngine->pAudioOutputDevice->Channel(AudioDeviceChannel);
        if (!pChannel) throw AudioOutputException("Invalid audio output device channel " + ToString(AudioDeviceChannel));
        switch (EngineAudioChannel) {
            case 0: // left output channel
                pOutputLeft = pChannel->Buffer();
                AudioDeviceChannelLeft = AudioDeviceChannel;
                break;
            case 1: // right output channel
                pOutputRight = pChannel->Buffer();
                AudioDeviceChannelRight = AudioDeviceChannel;
                break;
            default:
                throw AudioOutputException("Invalid engine audio channel " + ToString(EngineAudioChannel));
        }
    }

    int EngineChannel::OutputChannel(uint EngineAudioChannel) {
        switch (EngineAudioChannel) {
            case 0: // left channel
                return AudioDeviceChannelLeft;
            case 1: // right channel
                return AudioDeviceChannelRight;
            default:
                throw AudioOutputException("Invalid engine audio channel " + ToString(EngineAudioChannel));
        }
    }

    /**
     *  Will be called by the MIDIIn Thread to let the audio thread trigger a new
     *  voice for the given key.
     *
     *  @param Key      - MIDI key number of the triggered key
     *  @param Velocity - MIDI velocity value of the triggered key
     */
    void EngineChannel::SendNoteOn(uint8_t Key, uint8_t Velocity) {
        if (pEngine) {
            Event event               = pEngine->pEventGenerator->CreateEvent();
            event.Type                = Event::type_note_on;
            event.Param.Note.Key      = Key;
            event.Param.Note.Velocity = Velocity;
            if (this->pEventQueue->write_space() > 0) this->pEventQueue->push(&event);
            else dmsg(1,("Engine: Input event queue full!"));
        }
    }

    /**
     *  Will be called by the MIDIIn Thread to signal the audio thread to release
     *  voice(s) on the given key.
     *
     *  @param Key      - MIDI key number of the released key
     *  @param Velocity - MIDI release velocity value of the released key
     */
    void EngineChannel::SendNoteOff(uint8_t Key, uint8_t Velocity) {
        if (pEngine) {
            Event event               = pEngine->pEventGenerator->CreateEvent();
            event.Type                = Event::type_note_off;
            event.Param.Note.Key      = Key;
            event.Param.Note.Velocity = Velocity;
            if (this->pEventQueue->write_space() > 0) this->pEventQueue->push(&event);
            else dmsg(1,("Engine: Input event queue full!"));
        }
    }

    /**
     *  Will be called by the MIDIIn Thread to signal the audio thread to change
     *  the pitch value for all voices.
     *
     *  @param Pitch - MIDI pitch value (-8192 ... +8191)
     */
    void EngineChannel::SendPitchbend(int Pitch) {
        if (pEngine) {        
            Event event             = pEngine->pEventGenerator->CreateEvent();
            event.Type              = Event::type_pitchbend;
            event.Param.Pitch.Pitch = Pitch;
            if (this->pEventQueue->write_space() > 0) this->pEventQueue->push(&event);
            else dmsg(1,("Engine: Input event queue full!"));
        }
    }

    /**
     *  Will be called by the MIDIIn Thread to signal the audio thread that a
     *  continuous controller value has changed.
     *
     *  @param Controller - MIDI controller number of the occured control change
     *  @param Value      - value of the control change
     */
    void EngineChannel::SendControlChange(uint8_t Controller, uint8_t Value) {
        if (pEngine) {
            Event event               = pEngine->pEventGenerator->CreateEvent();
            event.Type                = Event::type_control_change;
            event.Param.CC.Controller = Controller;
            event.Param.CC.Value      = Value;
            if (this->pEventQueue->write_space() > 0) this->pEventQueue->push(&event);
            else dmsg(1,("Engine: Input event queue full!"));
        }
    }

    float EngineChannel::Volume() {
        return GlobalVolume;
    }

    void EngineChannel::Volume(float f) {
        GlobalVolume = f;
    }

    uint EngineChannel::Channels() {
        return 2;
    }

    String EngineChannel::InstrumentFileName() {
        return InstrumentFile;
    }

    String EngineChannel::InstrumentName() {
        return InstrumentIdxName;
    }

    int EngineChannel::InstrumentIndex() {
        return InstrumentIdx;
    }

    int EngineChannel::InstrumentStatus() {
        return InstrumentStat;
    }    

}} // namespace LinuxSampler::gig
1	/***************************************************************************
2	* *
3	* LinuxSampler - modular, streaming capable sampler *
4	* *
5	* Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck *
6	* Copyright (C) 2005 Christian Schoenebeck *
7	* *
8	* This program is free software; you can redistribute it and/or modify *
9	* it under the terms of the GNU General Public License as published by *
10	* the Free Software Foundation; either version 2 of the License, or *
11	* (at your option) any later version. *
12	* *
13	* This program is distributed in the hope that it will be useful, *
14	* but WITHOUT ANY WARRANTY; without even the implied warranty of *
15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
16	* GNU General Public License for more details. *
17	* *
18	* You should have received a copy of the GNU General Public License *
19	* along with this program; if not, write to the Free Software *
20	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, *
21	* MA 02111-1307 USA *
22	***************************************************************************/
23
24	#include "EngineChannel.h"
25
26	namespace LinuxSampler { namespace gig {
27
28	EngineChannel::EngineChannel() {
29	pMIDIKeyInfo = new midi_key_info_t[128];
30	pEngine = NULL;
31	pInstrument = NULL;
32	pEventQueue = new RingBuffer<Event>(MAX_EVENTS_PER_FRAGMENT, 0);
33	pActiveKeys = new Pool<uint>(128);
34	for (uint i = 0; i < 128; i++) {
35	pMIDIKeyInfo[i].pActiveVoices = NULL; // we allocate when we retrieve the right Engine object
36	pMIDIKeyInfo[i].KeyPressed = false;
37	pMIDIKeyInfo[i].Active = false;
38	pMIDIKeyInfo[i].ReleaseTrigger = false;
39	pMIDIKeyInfo[i].pEvents = NULL; // we allocate when we retrieve the right Engine object
40	}
41	InstrumentIdx = -1;
42	InstrumentStat = -1;
43	AudioDeviceChannelLeft = -1;
44	AudioDeviceChannelRight = -1;
45	}
46
47	EngineChannel::~EngineChannel() {
48	if (pInstrument) Engine::instruments.HandBack(pInstrument, this);
49	for (uint i = 0; i < 128; i++) {
50	if (pMIDIKeyInfo[i].pActiveVoices) {
51	pMIDIKeyInfo[i].pActiveVoices->clear();
52	delete pMIDIKeyInfo[i].pActiveVoices;
53	}
54	if (pMIDIKeyInfo[i].pEvents) {
55	pMIDIKeyInfo[i].pEvents->clear();
56	delete pMIDIKeyInfo[i].pEvents;
57	}
58	}
59	if (pEventQueue) delete pEventQueue;
60	if (pActiveKeys) delete pActiveKeys;
61	if (pMIDIKeyInfo) delete[] pMIDIKeyInfo;
62	}
63
64	/**
65	* This method is not thread safe!
66	*/
67	void EngineChannel::ResetInternal() {
68	Pitch = 0;
69	SustainPedal = false;
70	GlobalVolume = 1.0;
71	CurrentKeyDimension = 0;
72
73	// set all MIDI controller values to zero
74	memset(ControllerTable, 0x00, 128);
75
76	// reset key info
77	for (uint i = 0; i < 128; i++) {
78	if (pMIDIKeyInfo[i].pActiveVoices)
79	pMIDIKeyInfo[i].pActiveVoices->clear();
80	if (pMIDIKeyInfo[i].pEvents)
81	pMIDIKeyInfo[i].pEvents->clear();
82	pMIDIKeyInfo[i].KeyPressed = false;
83	pMIDIKeyInfo[i].Active = false;
84	pMIDIKeyInfo[i].ReleaseTrigger = false;
85	pMIDIKeyInfo[i].itSelf = Pool<uint>::Iterator();
86	}
87
88	// reset all key groups
89	std::map<uint,uint*>::iterator iter = ActiveKeyGroups.begin();
90	for (; iter != ActiveKeyGroups.end(); iter++) iter->second = NULL;
91
92	// free all active keys
93	pActiveKeys->clear();
94
95	// delete all input events
96	pEventQueue->init();
97
98	if (pEngine) pEngine->ResetInternal();
99	}
100
101	int EngineChannel::RenderAudio(uint Samples) {
102	return (pEngine) ? pEngine->RenderAudio(this, Samples) : 0;
103	}
104
105	LinuxSampler::Engine* EngineChannel::GetEngine() {
106	return pEngine;
107	}
108
109	/**
110	* More or less a workaround to set the instrument name, index and load
111	* status variable to zero percent immediately, that is without blocking
112	* the calling thread. It might be used in future for other preparations
113	* as well though.
114	*
115	* @param FileName - file name of the Gigasampler instrument file
116	* @param Instrument - index of the instrument in the .gig file
117	* @see LoadInstrument()
118	*/
119	void EngineChannel::PrepareLoadInstrument(const char* FileName, uint Instrument) {
120	InstrumentFile = FileName;
121	InstrumentIdx = Instrument;
122	InstrumentStat = 0;
123	}
124
125	/**
126	* Load an instrument from a .gig file. PrepareLoadInstrument() has to
127	* be called first to provide the information which instrument to load.
128	* This method will then actually start to load the instrument and block
129	* the calling thread until loading was completed.
130	*
131	* @returns detailed description of the method call result
132	* @see PrepareLoadInstrument()
133	*/
134	void EngineChannel::LoadInstrument() {
135
136	if (pEngine) pEngine->DisableAndLock();
137
138	ResetInternal();
139
140	// free old instrument
141	if (pInstrument) {
142	// give old instrument back to instrument manager
143	Engine::instruments.HandBack(pInstrument, this);
144	}
145
146	// delete all key groups
147	ActiveKeyGroups.clear();
148
149	// request gig instrument from instrument manager
150	try {
151	instrument_id_t instrid;
152	instrid.FileName = InstrumentFile;
153	instrid.iInstrument = InstrumentIdx;
154	pInstrument = Engine::instruments.Borrow(instrid, this);
155	if (!pInstrument) {
156	InstrumentStat = -1;
157	dmsg(1,("no instrument loaded!!!\n"));
158	exit(EXIT_FAILURE);
159	}
160	}
161	catch (RIFF::Exception e) {
162	InstrumentStat = -2;
163	String msg = "gig::Engine error: Failed to load instrument, cause: " + e.Message;
164	throw LinuxSamplerException(msg);
165	}
166	catch (InstrumentResourceManagerException e) {
167	InstrumentStat = -3;
168	String msg = "gig::Engine error: Failed to load instrument, cause: " + e.Message();
169	throw LinuxSamplerException(msg);
170	}
171	catch (...) {
172	InstrumentStat = -4;
173	throw LinuxSamplerException("gig::Engine error: Failed to load instrument, cause: Unknown exception while trying to parse gig file.");
174	}
175
176	// rebuild ActiveKeyGroups map with key groups of current instrument
177	for (::gig::Region* pRegion = pInstrument->GetFirstRegion(); pRegion; pRegion = pInstrument->GetNextRegion())
178	if (pRegion->KeyGroup) ActiveKeyGroups[pRegion->KeyGroup] = NULL;
179
180	InstrumentIdxName = pInstrument->pInfo->Name;
181	InstrumentStat = 100;
182
183	// inform audio driver for the need of two channels
184	try {
185	if (pEngine && pEngine->pAudioOutputDevice)
186	pEngine->pAudioOutputDevice->AcquireChannels(2); // gig Engine only stereo
187	}
188	catch (AudioOutputException e) {
189	String msg = "Audio output device unable to provide 2 audio channels, cause: " + e.Message();
190	throw LinuxSamplerException(msg);
191	}
192
193	if (pEngine) pEngine->Enable();
194	}
195
196	/**
197	* Will be called by the InstrumentResourceManager when the instrument
198	* we are currently using in this engine is going to be updated, so we
199	* can stop playback before that happens.
200	*/
201	void EngineChannel::ResourceToBeUpdated(::gig::Instrument* pResource, void*& pUpdateArg) {
202	dmsg(3,("gig::Engine: Received instrument update message.\n"));
203	if (pEngine) pEngine->DisableAndLock();
204	ResetInternal();
205	this->pInstrument = NULL;
206	}
207
208	/**
209	* Will be called by the InstrumentResourceManager when the instrument
210	* update process was completed, so we can continue with playback.
211	*/
212	void EngineChannel::ResourceUpdated(::gig::Instrument* pOldResource, ::gig::Instrument* pNewResource, void* pUpdateArg) {
213	this->pInstrument = pNewResource; //TODO: there are couple of engine parameters we should update here as well if the instrument was updated (see LoadInstrument())
214	if (pEngine) pEngine->Enable();
215	}
216
217	void EngineChannel::Connect(AudioOutputDevice* pAudioOut) {
218	pEngine = Engine::AcquireEngine(this, pAudioOut);
219	ResetInternal();
220	for (uint i = 0; i < 128; i++) {
221	pMIDIKeyInfo[i].pActiveVoices = new RTList<Voice>(pEngine->pVoicePool);
222	pMIDIKeyInfo[i].pEvents = new RTList<Event>(pEngine->pEventPool);
223	}
224	AudioDeviceChannelLeft = 0;
225	AudioDeviceChannelRight = 1;
226	pOutputLeft = pAudioOut->Channel(0)->Buffer();
227	pOutputRight = pAudioOut->Channel(1)->Buffer();
228	}
229
230	void EngineChannel::DisconnectAudioOutputDevice() {
231	if (pEngine) { // if clause to prevent disconnect loops
232	ResetInternal();
233	for (uint i = 0; i < 128; i++) {
234	if (pMIDIKeyInfo[i].pActiveVoices) delete pMIDIKeyInfo[i].pActiveVoices;
235	if (pMIDIKeyInfo[i].pEvents) delete pMIDIKeyInfo[i].pEvents;
236	}
237	Engine* oldEngine = pEngine;
238	AudioOutputDevice* oldAudioDevice = pEngine->pAudioOutputDevice;
239	pEngine = NULL;
240	Engine::FreeEngine(this, oldAudioDevice);
241	AudioDeviceChannelLeft = -1;
242	AudioDeviceChannelRight = -1;
243	oldAudioDevice->Disconnect(this);
244	}
245	}
246
247	void EngineChannel::SetOutputChannel(uint EngineAudioChannel, uint AudioDeviceChannel) {
248	if (!pEngine \|\| !pEngine->pAudioOutputDevice) throw AudioOutputException("No audio output device connected yet.");
249
250	AudioChannel* pChannel = pEngine->pAudioOutputDevice->Channel(AudioDeviceChannel);
251	if (!pChannel) throw AudioOutputException("Invalid audio output device channel " + ToString(AudioDeviceChannel));
252	switch (EngineAudioChannel) {
253	case 0: // left output channel
254	pOutputLeft = pChannel->Buffer();
255	AudioDeviceChannelLeft = AudioDeviceChannel;
256	break;
257	case 1: // right output channel
258	pOutputRight = pChannel->Buffer();
259	AudioDeviceChannelRight = AudioDeviceChannel;
260	break;
261	default:
262	throw AudioOutputException("Invalid engine audio channel " + ToString(EngineAudioChannel));
263	}
264	}
265
266	int EngineChannel::OutputChannel(uint EngineAudioChannel) {
267	switch (EngineAudioChannel) {
268	case 0: // left channel
269	return AudioDeviceChannelLeft;
270	case 1: // right channel
271	return AudioDeviceChannelRight;
272	default:
273	throw AudioOutputException("Invalid engine audio channel " + ToString(EngineAudioChannel));
274	}
275	}
276
277	/**
278	* Will be called by the MIDIIn Thread to let the audio thread trigger a new
279	* voice for the given key.
280	*
281	* @param Key - MIDI key number of the triggered key
282	* @param Velocity - MIDI velocity value of the triggered key
283	*/
284	void EngineChannel::SendNoteOn(uint8_t Key, uint8_t Velocity) {
285	if (pEngine) {
286	Event event = pEngine->pEventGenerator->CreateEvent();
287	event.Type = Event::type_note_on;
288	event.Param.Note.Key = Key;
289	event.Param.Note.Velocity = Velocity;
290	if (this->pEventQueue->write_space() > 0) this->pEventQueue->push(&event);
291	else dmsg(1,("Engine: Input event queue full!"));
292	}
293	}
294
295	/**
296	* Will be called by the MIDIIn Thread to signal the audio thread to release
297	* voice(s) on the given key.
298	*
299	* @param Key - MIDI key number of the released key
300	* @param Velocity - MIDI release velocity value of the released key
301	*/
302	void EngineChannel::SendNoteOff(uint8_t Key, uint8_t Velocity) {
303	if (pEngine) {
304	Event event = pEngine->pEventGenerator->CreateEvent();
305	event.Type = Event::type_note_off;
306	event.Param.Note.Key = Key;
307	event.Param.Note.Velocity = Velocity;
308	if (this->pEventQueue->write_space() > 0) this->pEventQueue->push(&event);
309	else dmsg(1,("Engine: Input event queue full!"));
310	}
311	}
312
313	/**
314	* Will be called by the MIDIIn Thread to signal the audio thread to change
315	* the pitch value for all voices.
316	*
317	* @param Pitch - MIDI pitch value (-8192 ... +8191)
318	*/
319	void EngineChannel::SendPitchbend(int Pitch) {
320	if (pEngine) {
321	Event event = pEngine->pEventGenerator->CreateEvent();
322	event.Type = Event::type_pitchbend;
323	event.Param.Pitch.Pitch = Pitch;
324	if (this->pEventQueue->write_space() > 0) this->pEventQueue->push(&event);
325	else dmsg(1,("Engine: Input event queue full!"));
326	}
327	}
328
329	/**
330	* Will be called by the MIDIIn Thread to signal the audio thread that a
331	* continuous controller value has changed.
332	*
333	* @param Controller - MIDI controller number of the occured control change
334	* @param Value - value of the control change
335	*/
336	void EngineChannel::SendControlChange(uint8_t Controller, uint8_t Value) {
337	if (pEngine) {
338	Event event = pEngine->pEventGenerator->CreateEvent();
339	event.Type = Event::type_control_change;
340	event.Param.CC.Controller = Controller;
341	event.Param.CC.Value = Value;
342	if (this->pEventQueue->write_space() > 0) this->pEventQueue->push(&event);
343	else dmsg(1,("Engine: Input event queue full!"));
344	}
345	}
346
347	float EngineChannel::Volume() {
348	return GlobalVolume;
349	}
350
351	void EngineChannel::Volume(float f) {
352	GlobalVolume = f;
353	}
354
355	uint EngineChannel::Channels() {
356	return 2;
357	}
358
359	String EngineChannel::InstrumentFileName() {
360	return InstrumentFile;
361	}
362
363	String EngineChannel::InstrumentName() {
364	return InstrumentIdxName;
365	}
366
367	int EngineChannel::InstrumentIndex() {
368	return InstrumentIdx;
369	}
370
371	int EngineChannel::InstrumentStatus() {
372	return InstrumentStat;
373	}
374
375	}} // namespace LinuxSampler::gig