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

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Revision 2012 - (show annotations) (download) (as text)
Fri Oct 23 17:53:17 2009 UTC (14 years, 5 months ago) by iliev
File MIME type: text/x-c++hdr
File size: 7341 byte(s)
* Refactoring: moved the independent code from
  the Gigasampler format engine to base classes
* SFZ format engine: experimental code (not usable yet)
* SoundFont format engine: experimental code (not usable yet)
* Fixed crash which may occur when MIDI key + transpose is out of range

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 AbstractEngineChannel;
83 template<class V, class R, class I> friend class EngineChannelBase;
84
85 protected:
86 ArrayList<EngineChannel*> engineChannels; ///< All engine channels of a Engine instance.
87 ConditionServer EngineDisabled;
88 int8_t ScaleTuning[12]; ///< contains optional detune factors (-64..+63 cents) for all 12 semitones of an octave
89 RingBuffer<Event,false>* pEventQueue; ///< Input event queue for engine global events (e.g. SysEx messages).
90 EventGenerator* pEventGenerator;
91 RTList<Event>* pGlobalEvents; ///< All engine global events for the current audio fragment (usually only SysEx messages).
92 Pool<Event>* pEventPool; ///< Contains all Event objects that can be used.
93 RingBuffer<uint8_t,false>* pSysexBuffer; ///< Input buffer for MIDI system exclusive messages.
94 uint SampleRate; ///< Sample rate of the engines output audio signal (in Hz)
95 uint MaxSamplesPerCycle; ///< Size of each audio output buffer
96 unsigned long FrameTime; ///< Time in frames of the start of the current audio fragment
97 int ActiveVoiceCountMax; ///< the maximum voice usage since application start
98 atomic_t ActiveVoiceCount; ///< number of currently active voices
99
100 void RouteAudio(EngineChannel* pEngineChannel, uint Samples);
101 void ClearEventLists();
102 void ImportEvents(uint Samples);
103 void ProcessSysex(Pool<Event>::Iterator& itSysexEvent);
104 void ResetScaleTuning();
105 void ProcessPitchbend(AbstractEngineChannel* pEngineChannel, Pool<Event>::Iterator& itPitchbendEvent);
106
107 void ProcessFxSendControllers (
108 AbstractEngineChannel* pEngineChannel,
109 Pool<Event>::Iterator& itControlChangeEvent
110 );
111
112 uint8_t GSCheckSum(const RingBuffer<uint8_t,false>::NonVolatileReader AddrReader, uint DataSize);
113
114 virtual void ResetInternal() = 0;
115 virtual void KillAllVoices(EngineChannel* pEngineChannel, Pool<Event>::Iterator& itKillEvent) = 0;
116 virtual void ProcessNoteOn(EngineChannel* pEngineChannel, Pool<Event>::Iterator& itNoteOnEvent) = 0;
117 virtual void ProcessNoteOff(EngineChannel* pEngineChannel, Pool<Event>::Iterator& itNoteOffEvent) = 0;
118 virtual void ProcessControlChange(EngineChannel* pEngineChannel, Pool<Event>::Iterator& itControlChangeEvent) = 0;
119
120 private:
121 static std::map<Format, std::map<AudioOutputDevice*,AbstractEngine*> > engines;
122
123 static float* InitVolumeCurve();
124 static float* InitPanCurve();
125 static float* InitCrossfadeCurve();
126 static float* InitCurve(const float* segments, int size = 128);
127
128 void AdjustScale(int8_t ScaleTunes[12]);
129 };
130
131 } // namespace LinuxSampler
132
133 #endif /* __LS_ABSTRACTENGINE_H__ */
134

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