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

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Revision 2448 - (show annotations) (download) (as text)
Fri May 3 14:26:32 2013 UTC (6 years, 9 months ago) by schoenebeck
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* Immediately apply scale tuning changes to active voices.
* Exposed scale tuning to C++ API (along to the already existing standard
  SysEx way).
* Bumped version to 1.0.0.svn21

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) 2009-2013 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 "../common/ChangeFlagRelaxed.h"
35 #include "../drivers/audio/AudioOutputDevice.h"
36 #include "common/Event.h"
37 #include "common/SignalUnitRack.h"
38
39 namespace LinuxSampler {
40
41 class AbstractEngineChannel;
42
43 class AbstractEngine: public Engine {
44
45 public:
46 enum Format { GIG = 1, SF2, SFZ };
47 static String GetFormatString(Format f);
48 static AbstractEngine* AcquireEngine(AbstractEngineChannel* pChannel, AudioOutputDevice* pDevice);
49 static void FreeEngine(AbstractEngineChannel* pChannel, AudioOutputDevice* pDevice);
50
51 AbstractEngine();
52 virtual ~AbstractEngine();
53
54 // implementation of abstract methods derived from class 'LinuxSampler::Engine'
55 virtual void SendSysex(void* pData, uint Size, MidiInputPort* pSender) OVERRIDE;
56 virtual void Reset() OVERRIDE;
57 virtual void Enable() OVERRIDE;
58 virtual void Disable() OVERRIDE;
59 virtual uint VoiceCount() OVERRIDE;
60 virtual uint VoiceCountMax() OVERRIDE;
61 virtual String EngineName() OVERRIDE;
62 virtual void AdjustScaleTuning(const int8_t ScaleTunes[12]) OVERRIDE;
63 virtual void GetScaleTuning(int8_t* pScaleTunes) OVERRIDE;
64 virtual void ResetScaleTuning() OVERRIDE;
65
66 virtual Format GetEngineFormat() = 0;
67 virtual void Connect(AudioOutputDevice* pAudioOut) = 0;
68 virtual void DisableAndLock();
69
70 void SetVoiceCount(uint Count);
71
72 float Random() {
73 RandomSeed = RandomSeed * 1103515245 + 12345; // classic pseudo random number generator
74 return RandomSeed / 4294967296.0f;
75 }
76
77 // Simple array wrapper just to make sure memory is freed
78 // when liblinuxsampler is unloaded
79 class FloatTable {
80 private:
81 const float* array;
82 public:
83 FloatTable(const float* array) : array(array) { }
84 ~FloatTable() { delete[] array; }
85 const float& operator[](int i) const { return array[i]; }
86 };
87
88 static const FloatTable VolumeCurve; ///< Table that maps volume control change values 0..127 to amplitude. Unity gain is at 90.
89 static const FloatTable PanCurve; ///< Table that maps pan control change values 0..128 to right channel amplitude. Unity gain is at 64 (center).
90 static const FloatTable CrossfadeCurve; ///< Table that maps crossfade control change values 0..127 to amplitude. Unity gain is at 127.
91
92 AudioOutputDevice* pAudioOutputDevice;
93
94 //TODO: should be protected
95 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)
96 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)
97
98 friend class AbstractVoice;
99 friend class AbstractEngineChannel;
100 template<class V, class R, class I> friend class EngineChannelBase;
101 template<class EC, class R, class S, class D> friend class VoiceBase;
102
103 protected:
104 ArrayList<EngineChannel*> engineChannels; ///< All engine channels of a Engine instance.
105 ConditionServer EngineDisabled;
106 int8_t ScaleTuning[12]; ///< contains optional detune factors (-64..+63 cents) for all 12 semitones of an octave
107 ChangeFlagRelaxed ScaleTuningChanged; ///< Boolean flag indicating whenever ScaleTuning has been modified by a foreign thread (i.e. by API).
108 RingBuffer<Event,false>* pEventQueue; ///< Input event queue for engine global events (e.g. SysEx messages).
109 EventGenerator* pEventGenerator;
110 RTList<Event>* pGlobalEvents; ///< All engine global events for the current audio fragment (usually only SysEx messages).
111 Pool<Event>* pEventPool; ///< Contains all Event objects that can be used.
112 RingBuffer<uint8_t,false>* pSysexBuffer; ///< Input buffer for MIDI system exclusive messages.
113 uint SampleRate; ///< Sample rate of the engines output audio signal (in Hz)
114 uint MaxSamplesPerCycle; ///< Size of each audio output buffer
115 unsigned long FrameTime; ///< Time in frames of the start of the current audio fragment
116 int ActiveVoiceCountMax; ///< the maximum voice usage since application start
117 atomic_t ActiveVoiceCount; ///< number of currently active voices
118 int VoiceSpawnsLeft; ///< We only allow CONFIG_MAX_VOICES voices to be spawned per audio fragment, we use this variable to ensure this limit.
119
120 void RouteAudio(EngineChannel* pEngineChannel, uint Samples);
121 void RouteDedicatedVoiceChannels(EngineChannel* pEngineChannel, optional<float> FxSendLevels[2], uint Samples);
122 void ClearEventLists();
123 void ImportEvents(uint Samples);
124 void ProcessSysex(Pool<Event>::Iterator& itSysexEvent);
125 void ProcessPitchbend(AbstractEngineChannel* pEngineChannel, Pool<Event>::Iterator& itPitchbendEvent);
126
127 void ProcessFxSendControllers (
128 AbstractEngineChannel* pEngineChannel,
129 Pool<Event>::Iterator& itControlChangeEvent
130 );
131
132 uint8_t GSCheckSum(const RingBuffer<uint8_t,false>::NonVolatileReader AddrReader, uint DataSize);
133
134 virtual void ResetInternal() = 0;
135 virtual void KillAllVoices(EngineChannel* pEngineChannel, Pool<Event>::Iterator& itKillEvent) = 0;
136 virtual void ProcessNoteOn(EngineChannel* pEngineChannel, Pool<Event>::Iterator& itNoteOnEvent) = 0;
137 virtual void ProcessNoteOff(EngineChannel* pEngineChannel, Pool<Event>::Iterator& itNoteOffEvent) = 0;
138 virtual void ProcessControlChange(EngineChannel* pEngineChannel, Pool<Event>::Iterator& itControlChangeEvent) = 0;
139 virtual int GetMinFadeOutSamples() = 0;
140
141 private:
142 static std::map<Format, std::map<AudioOutputDevice*,AbstractEngine*> > engines;
143 uint32_t RandomSeed; ///< State of the random number generator used by the random dimension.
144
145 static float* InitVolumeCurve();
146 static float* InitPanCurve();
147 static float* InitCrossfadeCurve();
148 static float* InitCurve(const float* segments, int size = 128);
149
150 bool RouteFxSend(FxSend* pFxSend, AudioChannel* ppSource[2], float FxSendLevel, uint Samples);
151 };
152
153 } // namespace LinuxSampler
154
155 #endif /* __LS_ABSTRACTENGINE_H__ */
156

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