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

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Revision 2448 - (hide annotations) (download) (as text)
Fri May 3 14:26:32 2013 UTC (10 years, 10 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 iliev 2012 /***************************************************************************
2     * *
3     * LinuxSampler - modular, streaming capable sampler *
4     * *
5     * Copyright (C) 2003,2004 by Benno Senoner and Christian Schoenebeck *
6 persson 2072 * Copyright (C) 2005-2008 Christian Schoenebeck *
7 persson 2427 * Copyright (C) 2009-2013 Christian Schoenebeck and Grigor Iliev *
8 iliev 2012 * *
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 schoenebeck 2448 #include "../common/ChangeFlagRelaxed.h"
35 iliev 2012 #include "../drivers/audio/AudioOutputDevice.h"
36     #include "common/Event.h"
37 iliev 2296 #include "common/SignalUnitRack.h"
38 iliev 2012
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 schoenebeck 2434 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 schoenebeck 2448 virtual void AdjustScaleTuning(const int8_t ScaleTunes[12]) OVERRIDE;
63     virtual void GetScaleTuning(int8_t* pScaleTunes) OVERRIDE;
64     virtual void ResetScaleTuning() OVERRIDE;
65 iliev 2012
66     virtual Format GetEngineFormat() = 0;
67     virtual void Connect(AudioOutputDevice* pAudioOut) = 0;
68     virtual void DisableAndLock();
69    
70 persson 2427 void SetVoiceCount(uint Count);
71 iliev 2297
72     float Random() {
73     RandomSeed = RandomSeed * 1103515245 + 12345; // classic pseudo random number generator
74     return RandomSeed / 4294967296.0f;
75     }
76 persson 2427
77     // Simple array wrapper just to make sure memory is freed
78     // when liblinuxsampler is unloaded
79 iliev 2012 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 schoenebeck 2121
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 iliev 2012
98 iliev 2015 friend class AbstractVoice;
99 iliev 2012 friend class AbstractEngineChannel;
100     template<class V, class R, class I> friend class EngineChannelBase;
101 iliev 2015 template<class EC, class R, class S, class D> friend class VoiceBase;
102 iliev 2012
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 schoenebeck 2448 ChangeFlagRelaxed ScaleTuningChanged; ///< Boolean flag indicating whenever ScaleTuning has been modified by a foreign thread (i.e. by API).
108 iliev 2012 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 iliev 2027 RingBuffer<uint8_t,false>* pSysexBuffer; ///< Input buffer for MIDI system exclusive messages.
113 iliev 2012 uint SampleRate; ///< Sample rate of the engines output audio signal (in Hz)
114     uint MaxSamplesPerCycle; ///< Size of each audio output buffer
115 iliev 2027 unsigned long FrameTime; ///< Time in frames of the start of the current audio fragment
116 iliev 2012 int ActiveVoiceCountMax; ///< the maximum voice usage since application start
117 iliev 2027 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 iliev 2012
120     void RouteAudio(EngineChannel* pEngineChannel, uint Samples);
121 schoenebeck 2121 void RouteDedicatedVoiceChannels(EngineChannel* pEngineChannel, optional<float> FxSendLevels[2], uint Samples);
122 iliev 2012 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 iliev 2015 virtual int GetMinFadeOutSamples() = 0;
140 iliev 2012
141     private:
142     static std::map<Format, std::map<AudioOutputDevice*,AbstractEngine*> > engines;
143 persson 2072 uint32_t RandomSeed; ///< State of the random number generator used by the random dimension.
144 iliev 2012
145     static float* InitVolumeCurve();
146     static float* InitPanCurve();
147     static float* InitCrossfadeCurve();
148     static float* InitCurve(const float* segments, int size = 128);
149    
150 schoenebeck 2121 bool RouteFxSend(FxSend* pFxSend, AudioChannel* ppSource[2], float FxSendLevel, uint Samples);
151 iliev 2012 };
152    
153     } // namespace LinuxSampler
154    
155     #endif /* __LS_ABSTRACTENGINE_H__ */
156    

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