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

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Revision 2298 - (show annotations) (download) (as text)
Fri Dec 9 17:04:24 2011 UTC (12 years, 3 months ago) by iliev
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* use different EQ effect instance for every voice

1 /***************************************************************************
2 * *
3 * LinuxSampler - modular, streaming capable sampler *
4 * *
5 * Copyright (C) 2003,2004 by Benno Senoner and Christian Schoenebeck *
6 * Copyright (C) 2005-2008 Christian Schoenebeck *
7 * Copyright (C) 2009-2010 Christian Schoenebeck and 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 #include "common/SignalUnitRack.h"
37
38 namespace LinuxSampler {
39
40 class AbstractEngineChannel;
41
42 class AbstractEngine: public Engine {
43
44 public:
45 enum Format { GIG = 1, SF2, SFZ };
46 static String GetFormatString(Format f);
47 static AbstractEngine* AcquireEngine(AbstractEngineChannel* pChannel, AudioOutputDevice* pDevice);
48 static void FreeEngine(AbstractEngineChannel* pChannel, AudioOutputDevice* pDevice);
49
50 AbstractEngine();
51 virtual ~AbstractEngine();
52
53 // implementation of abstract methods derived from class 'LinuxSampler::Engine'
54 virtual void SendSysex(void* pData, uint Size, MidiInputPort* pSender);
55 virtual void Reset();
56 virtual void Enable();
57 virtual void Disable();
58 virtual uint VoiceCount();
59 virtual uint VoiceCountMax();
60 virtual String EngineName();
61
62 virtual Format GetEngineFormat() = 0;
63 virtual void Connect(AudioOutputDevice* pAudioOut) = 0;
64 virtual void DisableAndLock();
65
66 void SetVoiceCount(uint Count);// Simple array wrapper just to make sure memory is freed
67 // when liblinuxsampler is unloaded
68
69 float Random() {
70 RandomSeed = RandomSeed * 1103515245 + 12345; // classic pseudo random number generator
71 return RandomSeed / 4294967296.0f;
72 }
73
74 class FloatTable {
75 private:
76 const float* array;
77 public:
78 FloatTable(const float* array) : array(array) { }
79 ~FloatTable() { delete[] array; }
80 const float& operator[](int i) const { return array[i]; }
81 };
82
83 static const FloatTable VolumeCurve; ///< Table that maps volume control change values 0..127 to amplitude. Unity gain is at 90.
84 static const FloatTable PanCurve; ///< Table that maps pan control change values 0..128 to right channel amplitude. Unity gain is at 64 (center).
85 static const FloatTable CrossfadeCurve; ///< Table that maps crossfade control change values 0..127 to amplitude. Unity gain is at 127.
86
87 AudioOutputDevice* pAudioOutputDevice;
88
89 //TODO: should be protected
90 AudioChannel* pDedicatedVoiceChannelLeft; ///< encapsulates a special audio rendering buffer (left) for rendering and routing audio on a per voice basis (this is a very special case and only used for voices which lie on a note which was set with individual, dedicated FX send level)
91 AudioChannel* pDedicatedVoiceChannelRight; ///< encapsulates a special audio rendering buffer (right) for rendering and routing audio on a per voice basis (this is a very special case and only used for voices which lie on a note which was set with individual, dedicated FX send level)
92
93 friend class AbstractVoice;
94 friend class AbstractEngineChannel;
95 template<class V, class R, class I> friend class EngineChannelBase;
96 template<class EC, class R, class S, class D> friend class VoiceBase;
97
98 protected:
99 ArrayList<EngineChannel*> engineChannels; ///< All engine channels of a Engine instance.
100 ConditionServer EngineDisabled;
101 int8_t ScaleTuning[12]; ///< contains optional detune factors (-64..+63 cents) for all 12 semitones of an octave
102 RingBuffer<Event,false>* pEventQueue; ///< Input event queue for engine global events (e.g. SysEx messages).
103 EventGenerator* pEventGenerator;
104 RTList<Event>* pGlobalEvents; ///< All engine global events for the current audio fragment (usually only SysEx messages).
105 Pool<Event>* pEventPool; ///< Contains all Event objects that can be used.
106 RingBuffer<uint8_t,false>* pSysexBuffer; ///< Input buffer for MIDI system exclusive messages.
107 uint SampleRate; ///< Sample rate of the engines output audio signal (in Hz)
108 uint MaxSamplesPerCycle; ///< Size of each audio output buffer
109 unsigned long FrameTime; ///< Time in frames of the start of the current audio fragment
110 int ActiveVoiceCountMax; ///< the maximum voice usage since application start
111 atomic_t ActiveVoiceCount; ///< number of currently active voices
112 int VoiceSpawnsLeft; ///< We only allow CONFIG_MAX_VOICES voices to be spawned per audio fragment, we use this variable to ensure this limit.
113
114 void RouteAudio(EngineChannel* pEngineChannel, uint Samples);
115 void RouteDedicatedVoiceChannels(EngineChannel* pEngineChannel, optional<float> FxSendLevels[2], uint Samples);
116 void ClearEventLists();
117 void ImportEvents(uint Samples);
118 void ProcessSysex(Pool<Event>::Iterator& itSysexEvent);
119 void ResetScaleTuning();
120 void ProcessPitchbend(AbstractEngineChannel* pEngineChannel, Pool<Event>::Iterator& itPitchbendEvent);
121
122 void ProcessFxSendControllers (
123 AbstractEngineChannel* pEngineChannel,
124 Pool<Event>::Iterator& itControlChangeEvent
125 );
126
127 uint8_t GSCheckSum(const RingBuffer<uint8_t,false>::NonVolatileReader AddrReader, uint DataSize);
128
129 virtual void ResetInternal() = 0;
130 virtual void KillAllVoices(EngineChannel* pEngineChannel, Pool<Event>::Iterator& itKillEvent) = 0;
131 virtual void ProcessNoteOn(EngineChannel* pEngineChannel, Pool<Event>::Iterator& itNoteOnEvent) = 0;
132 virtual void ProcessNoteOff(EngineChannel* pEngineChannel, Pool<Event>::Iterator& itNoteOffEvent) = 0;
133 virtual void ProcessControlChange(EngineChannel* pEngineChannel, Pool<Event>::Iterator& itControlChangeEvent) = 0;
134 virtual int GetMinFadeOutSamples() = 0;
135
136 private:
137 static std::map<Format, std::map<AudioOutputDevice*,AbstractEngine*> > engines;
138 uint32_t RandomSeed; ///< State of the random number generator used by the random dimension.
139
140 static float* InitVolumeCurve();
141 static float* InitPanCurve();
142 static float* InitCrossfadeCurve();
143 static float* InitCurve(const float* segments, int size = 128);
144
145 void AdjustScale(int8_t ScaleTunes[12]);
146 bool RouteFxSend(FxSend* pFxSend, AudioChannel* ppSource[2], float FxSendLevel, uint Samples);
147 };
148
149 } // namespace LinuxSampler
150
151 #endif /* __LS_ABSTRACTENGINE_H__ */
152

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