/[svn]/linuxsampler/trunk/src/engines/AbstractEngine.h
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Contents of /linuxsampler/trunk/src/engines/AbstractEngine.h

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Revision 2015 - (show annotations) (download) (as text)
Sun Oct 25 22:22:52 2009 UTC (14 years, 5 months ago) by iliev
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* Refactoring: moved the independent code from gig::Voice to base classes
* SoundFont format engine: implemented EG1 & EG2

1 /***************************************************************************
2 * *
3 * LinuxSampler - modular, streaming capable sampler *
4 * *
5 * Copyright (C) 2003,2004 by Benno Senoner and Christian Schoenebeck *
6 * Copyright (C) 2005-2009 Christian Schoenebeck *
7 * Copyright (C) 2009 Grigor Iliev *
8 * *
9 * This program is free software; you can redistribute it and/or modify *
10 * it under the terms of the GNU General Public License as published by *
11 * the Free Software Foundation; either version 2 of the License, or *
12 * (at your option) any later version. *
13 * *
14 * This program is distributed in the hope that it will be useful, *
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
17 * GNU General Public License for more details. *
18 * *
19 * You should have received a copy of the GNU General Public License *
20 * along with this program; if not, write to the Free Software *
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, *
22 * MA 02111-1307 USA *
23 ***************************************************************************/
24
25 #ifndef __LS_ABSTRACTENGINE_H__
26 #define __LS_ABSTRACTENGINE_H__
27
28 #include "Engine.h"
29 #include "../common/ArrayList.h"
30 #include "../common/atomic.h"
31 #include "../common/ConditionServer.h"
32 #include "../common/Pool.h"
33 #include "../common/RingBuffer.h"
34 #include "../drivers/audio/AudioOutputDevice.h"
35 #include "common/Event.h"
36
37 namespace LinuxSampler {
38
39 class AbstractEngineChannel;
40
41 class AbstractEngine: public Engine {
42
43 public:
44 enum Format { GIG = 1, SF2, SFZ };
45 static String GetFormatString(Format f);
46 static AbstractEngine* AcquireEngine(AbstractEngineChannel* pChannel, AudioOutputDevice* pDevice);
47 static void FreeEngine(AbstractEngineChannel* pChannel, AudioOutputDevice* pDevice);
48
49 AbstractEngine();
50 virtual ~AbstractEngine();
51
52 // implementation of abstract methods derived from class 'LinuxSampler::Engine'
53 virtual void SendSysex(void* pData, uint Size, MidiInputPort* pSender);
54 virtual void Reset();
55 virtual void Enable();
56 virtual void Disable();
57 virtual uint VoiceCount();
58 virtual uint VoiceCountMax();
59 virtual String EngineName();
60
61 virtual Format GetEngineFormat() = 0;
62 virtual void Connect(AudioOutputDevice* pAudioOut) = 0;
63 virtual void DisableAndLock();
64
65 void SetVoiceCount(uint Count);// Simple array wrapper just to make sure memory is freed
66 // when liblinuxsampler is unloaded
67 class FloatTable {
68 private:
69 const float* array;
70 public:
71 FloatTable(const float* array) : array(array) { }
72 ~FloatTable() { delete[] array; }
73 const float& operator[](int i) const { return array[i]; }
74 };
75
76 static const FloatTable VolumeCurve; ///< Table that maps volume control change values 0..127 to amplitude. Unity gain is at 90.
77 static const FloatTable PanCurve; ///< Table that maps pan control change values 0..128 to right channel amplitude. Unity gain is at 64 (center).
78 static const FloatTable CrossfadeCurve; ///< Table that maps crossfade control change values 0..127 to amplitude. Unity gain is at 127.
79
80 AudioOutputDevice* pAudioOutputDevice;
81
82 friend class AbstractVoice;
83 friend class AbstractEngineChannel;
84 template<class V, class R, class I> friend class EngineChannelBase;
85 template<class EC, class R, class S, class D> friend class VoiceBase;
86
87 protected:
88 ArrayList<EngineChannel*> engineChannels; ///< All engine channels of a Engine instance.
89 ConditionServer EngineDisabled;
90 int8_t ScaleTuning[12]; ///< contains optional detune factors (-64..+63 cents) for all 12 semitones of an octave
91 RingBuffer<Event,false>* pEventQueue; ///< Input event queue for engine global events (e.g. SysEx messages).
92 EventGenerator* pEventGenerator;
93 RTList<Event>* pGlobalEvents; ///< All engine global events for the current audio fragment (usually only SysEx messages).
94 Pool<Event>* pEventPool; ///< Contains all Event objects that can be used.
95 RingBuffer<uint8_t,false>* pSysexBuffer; ///< Input buffer for MIDI system exclusive messages.
96 uint SampleRate; ///< Sample rate of the engines output audio signal (in Hz)
97 uint MaxSamplesPerCycle; ///< Size of each audio output buffer
98 unsigned long FrameTime; ///< Time in frames of the start of the current audio fragment
99 int ActiveVoiceCountMax; ///< the maximum voice usage since application start
100 atomic_t ActiveVoiceCount; ///< number of currently active voices
101
102 void RouteAudio(EngineChannel* pEngineChannel, uint Samples);
103 void ClearEventLists();
104 void ImportEvents(uint Samples);
105 void ProcessSysex(Pool<Event>::Iterator& itSysexEvent);
106 void ResetScaleTuning();
107 void ProcessPitchbend(AbstractEngineChannel* pEngineChannel, Pool<Event>::Iterator& itPitchbendEvent);
108
109 void ProcessFxSendControllers (
110 AbstractEngineChannel* pEngineChannel,
111 Pool<Event>::Iterator& itControlChangeEvent
112 );
113
114 uint8_t GSCheckSum(const RingBuffer<uint8_t,false>::NonVolatileReader AddrReader, uint DataSize);
115
116 virtual void ResetInternal() = 0;
117 virtual void KillAllVoices(EngineChannel* pEngineChannel, Pool<Event>::Iterator& itKillEvent) = 0;
118 virtual void ProcessNoteOn(EngineChannel* pEngineChannel, Pool<Event>::Iterator& itNoteOnEvent) = 0;
119 virtual void ProcessNoteOff(EngineChannel* pEngineChannel, Pool<Event>::Iterator& itNoteOffEvent) = 0;
120 virtual void ProcessControlChange(EngineChannel* pEngineChannel, Pool<Event>::Iterator& itControlChangeEvent) = 0;
121 virtual int GetMinFadeOutSamples() = 0;
122
123 private:
124 static std::map<Format, std::map<AudioOutputDevice*,AbstractEngine*> > engines;
125
126 static float* InitVolumeCurve();
127 static float* InitPanCurve();
128 static float* InitCrossfadeCurve();
129 static float* InitCurve(const float* segments, int size = 128);
130
131 void AdjustScale(int8_t ScaleTunes[12]);
132 };
133
134 } // namespace LinuxSampler
135
136 #endif /* __LS_ABSTRACTENGINE_H__ */
137

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