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

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Sat Feb 3 15:33:00 2007 UTC (17 years, 1 month ago) by persson
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* playback is no longer disabled during instrument loading
* all notes playing on a channel that changes its instrument keep
  playing with the old instrument until they get a note off command
* new thread safety fix for lscp "load engine" and "set channel audio
  output device"

1 /***************************************************************************
2 * *
3 * LinuxSampler - modular, streaming capable sampler *
4 * *
5 * Copyright (C) 2003,2004 by Benno Senoner and Christian Schoenebeck *
6 * Copyright (C) 2005-2007 Christian Schoenebeck *
7 * *
8 * This program is free software; you can redistribute it and/or modify *
9 * it under the terms of the GNU General Public License as published by *
10 * the Free Software Foundation; either version 2 of the License, or *
11 * (at your option) any later version. *
12 * *
13 * This program is distributed in the hope that it will be useful, *
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
16 * GNU General Public License for more details. *
17 * *
18 * You should have received a copy of the GNU General Public License *
19 * along with this program; if not, write to the Free Software *
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, *
21 * MA 02111-1307 USA *
22 ***************************************************************************/
23
24 #ifndef __LS_GIG_ENGINE_H__
25 #define __LS_GIG_ENGINE_H__
26
27 #include "../../common/global.h"
28
29 #include <map>
30 #include <gig.h>
31
32 #include "EngineGlobals.h"
33 #include "../../common/RingBuffer.h"
34 #include "../../common/Pool.h"
35 #include "../../common/ArrayList.h"
36 #include "../../common/ConditionServer.h"
37 #include "../Engine.h"
38 #include "../common/Event.h"
39 #include "../../network/lscp.h"
40 #include "EngineChannel.h"
41
42 // identifier of this sampler engine
43 #define LS_GIG_ENGINE_NAME "GIG"
44
45 namespace LinuxSampler { namespace gig {
46
47 // just symbol prototyping
48 class Voice;
49 class DiskThread;
50 class InstrumentResourceManager;
51 class midi_key_info_t;
52 class EngineChannel;
53
54 /**
55 * Sampler engine for the Gigasampler format.
56 */
57 class Engine : public LinuxSampler::Engine {
58 public:
59 // methods
60 Engine();
61 virtual ~Engine();
62 void Connect(AudioOutputDevice* pAudioOut);
63 ::gig::DimensionRegion** ChangeInstrument(EngineChannel* pEngineChannel, ::gig::Instrument* pInstrument);
64
65 // implementation of abstract methods derived from class 'LinuxSampler::Engine'
66 virtual int RenderAudio(uint Samples);
67 virtual void SendSysex(void* pData, uint Size);
68 virtual void Reset();
69 virtual void Enable();
70 virtual void Disable();
71 virtual uint VoiceCount();
72 virtual uint VoiceCountMax();
73 virtual bool DiskStreamSupported();
74 virtual uint DiskStreamCount();
75 virtual uint DiskStreamCountMax();
76 virtual String DiskStreamBufferFillBytes();
77 virtual String DiskStreamBufferFillPercentage();
78 virtual String Description();
79 virtual String Version();
80 virtual String EngineName();
81 virtual InstrumentManager* GetInstrumentManager();
82
83 static const float* VolumeCurve; ///< Table that maps volume control change values 0..127 to amplitude. Unity gain is at 90.
84 static const float* PanCurve; ///< Table that maps pan control change values 0..128 to right channel amplitude. Unity gain is at 64 (center).
85 static const float* CrossfadeCurve; ///< Table that maps crossfade control change values 0..127 to amplitude. Unity gain is at 127.
86
87 //protected:
88 static InstrumentResourceManager instruments;
89
90 AudioOutputDevice* pAudioOutputDevice;
91 uint SampleRate; ///< Sample rate of the engines output audio signal (in Hz)
92 uint MaxSamplesPerCycle; ///< Size of each audio output buffer
93 DiskThread* pDiskThread;
94 RingBuffer<Event,false>* pEventQueue; ///< Input event queue for engine global events (e.g. SysEx messages).
95 Pool<Voice>* pVoicePool; ///< Contains all voices that can be activated.
96 EventGenerator* pEventGenerator;
97 RTList<Event>* pVoiceStealingQueue; ///< All voice-launching events which had to be postponed due to free voice shortage.
98 RTList<Event>* pGlobalEvents; ///< All engine global events for the current audio fragment (usually only SysEx messages).
99 Pool<Event>* pEventPool; ///< Contains all Event objects that can be used.
100 RingBuffer<uint8_t,false>* pSysexBuffer; ///< Input buffer for MIDI system exclusive messages.
101 int ActiveVoiceCount; ///< number of currently active voices (this value will be returned for public calls)
102 int ActiveVoiceCountTemp; ///< number of currently active voices (for internal usage, will be used for incrementation)
103 int ActiveVoiceCountMax; ///< the maximum voice usage since application start
104 int VoiceSpawnsLeft; ///< We only allow CONFIG_MAX_VOICES voices to be spawned per audio fragment, we use this variable to ensure this limit.
105 RTList<Voice>::Iterator itLastStolenVoice; ///< Only for voice stealing: points to the last voice which was theft in current audio fragment, NULL otherwise.
106 RTList<uint>::Iterator iuiLastStolenKey; ///< Only for voice stealing: key number of last key on which the last voice was theft in current audio fragment, NULL otherwise.
107 EngineChannel* pLastStolenChannel; ///< Only for voice stealing: points to the engine channel on which the previous voice was stolen in this audio fragment.
108 RTList<Voice>::Iterator itLastStolenVoiceGlobally; ///< Same as itLastStolenVoice, but engine globally
109 RTList<uint>::Iterator iuiLastStolenKeyGlobally; ///< Same as iuiLastStolenKey, but engine globally
110 bool SuspensionRequested;
111 ConditionServer EngineDisabled;
112 int8_t ScaleTuning[12]; ///< contains optional detune factors (-64..+63 cents) for all 12 semitones of an octave
113 int MaxFadeOutPos; ///< The last position in an audio fragment to allow an instant fade out (e.g. for voice stealing) without leading to clicks.
114 uint32_t RandomSeed; ///< State of the random number generator used by the random dimension.
115 Mutex ResetInternalMutex; ///< Mutex to protect the ResetInternal function for concurrent usage (e.g. by the lscp and instrument loader threads).
116
117 void ProcessEvents(EngineChannel* pEngineChannel, uint Samples);
118 void RenderActiveVoices(EngineChannel* pEngineChannel, uint Samples);
119 void RenderStolenVoices(uint Samples);
120 void RouteAudio(EngineChannel* pEngineChannel, uint Samples);
121 void PostProcess(EngineChannel* pEngineChannel);
122 void ClearEventLists();
123 void ImportEvents(uint Samples);
124 void ProcessNoteOn(EngineChannel* pEngineChannel, Pool<Event>::Iterator& itNoteOnEvent);
125 void ProcessNoteOff(EngineChannel* pEngineChannel, Pool<Event>::Iterator& itNoteOffEvent);
126 void ProcessPitchbend(EngineChannel* pEngineChannel, Pool<Event>::Iterator& itPitchbendEvent);
127 void ProcessControlChange(EngineChannel* pEngineChannel, Pool<Event>::Iterator& itControlChangeEvent);
128 void ProcessSysex(Pool<Event>::Iterator& itSysexEvent);
129 Pool<Voice>::Iterator LaunchVoice(EngineChannel* pEngineChannel, Pool<Event>::Iterator& itNoteOnEvent, int iLayer, bool ReleaseTriggerVoice, bool VoiceStealing, bool HandleKeyGroupConflicts);
130 int StealVoice(EngineChannel* pEngineChannel, Pool<Event>::Iterator& itNoteOnEvent);
131 void FreeVoice(EngineChannel* pEngineChannel, Pool<Voice>::Iterator& itVoice);
132 void FreeKey(EngineChannel* pEngineChannel, midi_key_info_t* pKey);
133 void ResetInternal();
134 void ResetScaleTuning();
135
136 static Engine* AcquireEngine(LinuxSampler::gig::EngineChannel* pChannel, AudioOutputDevice* pDevice);
137 static void FreeEngine(LinuxSampler::gig::EngineChannel* pChannel, AudioOutputDevice* pDevice);
138
139 void DisableAndLock(); // FIXME: should at least be protected
140
141 friend class Voice;
142 private:
143
144 /// Command used by the instrument loader thread to
145 /// request an instrument change on a channel.
146 struct instrument_change_command_t {
147 EngineChannel* pEngineChannel;
148 ::gig::Instrument* pInstrument;
149 };
150 struct instrument_change_reply_t {
151 int dummy;
152 };
153 RingBuffer<instrument_change_command_t,false>* InstrumentChangeQueue; ///< Contains the instrument change command
154 RingBuffer<instrument_change_reply_t,false>* InstrumentChangeReplyQueue; ///< Contains the acknowledge of an instrument change
155 ::gig::DimensionRegion** pDimRegionsInUse; ///< After an instrument change, this contains a list of dimension regions that are still in use by playing voices
156
157 ArrayList<EngineChannel*> engineChannels; ///< All engine channels of a gig::Engine instance.
158
159 static std::map<AudioOutputDevice*,Engine*> engines; ///< All instances of gig::Engine.
160
161 int SostenutoKeys[128];
162 int SostenutoKeyCount;
163
164 uint8_t GSCheckSum(const RingBuffer<uint8_t,false>::NonVolatileReader AddrReader, uint DataSize);
165 void AdjustScale(int8_t ScaleTunes[12]);
166 void ReleaseAllVoices(EngineChannel* pEngineChannel, Pool<Event>::Iterator& itReleaseEvent);
167 void KillAllVoices(EngineChannel* pEngineChannel, Pool<Event>::Iterator& itKillEvent);
168 bool ShouldReleaseVoice(EngineChannel* pEngineChannel, int Key);
169 static float* InitVolumeCurve();
170 static float* InitPanCurve();
171 static float* InitCrossfadeCurve();
172 static float* InitCurve(const float* segments, int size = 128);
173
174 unsigned long FrameTime; ///< Time in frames of the start of the current audio fragment
175 };
176
177 }} // namespace LinuxSampler::gig
178
179 #endif // __LS_GIG_ENGINE_H__

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