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

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Sat Feb 26 02:01:14 2005 UTC (19 years, 2 months ago) by schoenebeck
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* design change: using now one sampler engine instance and one disk thread
  instance for all sampler channels that are connected to the same audio
  output device (and are using the same engine type of course)
* added EngineFactory / EngineChannelFactory to remove the annoying build
  dependencies e.g. of the lscpserver to the actual sampler engine
  implementations
* bumped version to 0.3.0 (current CVS state is still quite broken,
  previous, stable CVS version was tagged as "v0_2_0" and is also available
  as source tarball)

1 /***************************************************************************
2 * *
3 * LinuxSampler - modular, streaming capable sampler *
4 * *
5 * Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck *
6 * Copyright (C) 2005 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_VOICE_H__
25 #define __LS_GIG_VOICE_H__
26
27 #include "../../common/global.h"
28
29 #if DEBUG_HEADERS
30 # warning Voice.h included
31 #endif // DEBUG_HEADERS
32
33 #include "../../common/RTMath.h"
34 #include "../../common/RingBuffer.h"
35 #include "../../common/Pool.h"
36 #include "../../drivers/audio/AudioOutputDevice.h"
37 #include "../../lib/fileloader/libgig/gig.h"
38 #include "../common/BiquadFilter.h"
39 //#include "EngineGlobals.h"
40 #include "Engine.h"
41 #include "EngineChannel.h"
42 #include "Stream.h"
43 #include "DiskThread.h"
44
45 #include "EGDecay.h"
46 #include "Filter.h"
47 #include "../common/LFO.h"
48
49 namespace LinuxSampler { namespace gig {
50
51 class Engine;
52 class EGADSR;
53 class EGDecay;
54 class VCAManipulator;
55 class VCFCManipulator;
56 class VCOManipulator;
57
58 /// Reflects a MIDI controller
59 struct midi_ctrl {
60 uint8_t controller; ///< MIDI control change controller number
61 uint8_t value; ///< Current MIDI controller value
62 float fvalue; ///< Transformed / effective value (e.g. volume level or filter cutoff frequency)
63 };
64
65 /** Gig Voice
66 *
67 * Renders a voice for the Gigasampler format.
68 */
69 class Voice {
70 public:
71 // Types
72 enum type_t {
73 type_normal,
74 type_release_trigger_required, ///< If the key of this voice will be released, it causes a release triggered voice to be spawned
75 type_release_trigger ///< Release triggered voice which cannot be killed by releasing its key
76 };
77
78 // Attributes
79 type_t Type; ///< Voice Type
80 int MIDIKey; ///< MIDI key number of the key that triggered the voice
81 uint KeyGroup;
82 DiskThread* pDiskThread; ///< Pointer to the disk thread, to be able to order a disk stream and later to delete the stream again
83 RTList<Voice>::Iterator itChildVoice; ///< Points to the next layer voice (if any). This field is currently only used by the voice stealing algorithm.
84
85 // Methods
86 Voice();
87 ~Voice();
88 void Kill(Pool<Event>::Iterator& itKillEvent);
89 void Render(uint Samples);
90 void Reset();
91 void SetOutput(AudioOutputDevice* pAudioOutputDevice);
92 void SetEngine(Engine* pEngine);
93 int Trigger(EngineChannel* pEngineChannel, Pool<Event>::Iterator& itNoteOnEvent, int PitchBend, ::gig::Instrument* pInstrument, int iLayer, bool ReleaseTriggerVoice, bool VoiceStealing);
94 inline bool IsActive() { return PlaybackState; }
95 //private:
96 // Types
97 enum playback_state_t {
98 playback_state_end = 0,
99 playback_state_ram = 1,
100 playback_state_disk = 2
101 };
102
103 // Attributes
104 EngineChannel* pEngineChannel;
105 Engine* pEngine; ///< Pointer to the sampler engine, to be able to access the event lists.
106 float Volume; ///< Volume level of the voice
107 float PanLeft;
108 float PanRight;
109 float CrossfadeVolume; ///< Current attenuation level caused by a crossfade (only if a crossfade is defined of course)
110 double Pos; ///< Current playback position in sample
111 float PitchBase; ///< Basic pitch depth, stays the same for the whole life time of the voice
112 float PitchBend; ///< Current pitch value of the pitchbend wheel
113 ::gig::Sample* pSample; ///< Pointer to the sample to be played back
114 ::gig::Region* pRegion; ///< Pointer to the articulation information of the respective keyboard region of this voice
115 ::gig::DimensionRegion* pDimRgn; ///< Pointer to the articulation information of current dimension region of this voice
116 playback_state_t PlaybackState; ///< When a sample will be triggered, it will be first played from RAM cache and after a couple of sample points it will switch to disk streaming and at the end of a disk stream we have to add null samples, so the interpolator can do it's work correctly
117 bool DiskVoice; ///< If the sample is very short it completely fits into the RAM cache and doesn't need to be streamed from disk, in that case this flag is set to false
118 Stream::reference_t DiskStreamRef; ///< Reference / link to the disk stream
119 int RealSampleWordsLeftToRead; ///< Number of samples left to read, not including the silence added for the interpolator
120 unsigned long MaxRAMPos; ///< The upper allowed limit (not actually the end) in the RAM sample cache, after that point it's not safe to chase the interpolator another time over over the current cache position, instead we switch to disk then.
121 bool RAMLoop; ///< If this voice has a loop defined which completely fits into the cached RAM part of the sample, in this case we handle the looping within the voice class, else if the loop is located in the disk stream part, we let the disk stream handle the looping
122 uint LoopCyclesLeft; ///< In case there is a RAMLoop and it's not an endless loop; reflects number of loop cycles left to be passed
123 uint Delay; ///< Number of sample points the rendering process of this voice should be delayed (jitter correction), will be set to 0 after the first audio fragment cycle
124 EGADSR* pEG1; ///< Envelope Generator 1 (Amplification)
125 EGADSR* pEG2; ///< Envelope Generator 2 (Filter cutoff frequency)
126 EGDecay* pEG3; ///< Envelope Generator 3 (Pitch)
127 Filter FilterLeft;
128 Filter FilterRight;
129 midi_ctrl VCFCutoffCtrl;
130 midi_ctrl VCFResonanceCtrl;
131 int FilterUpdateCounter; ///< Used to update filter parameters all FILTER_UPDATE_PERIOD samples
132 static const float FILTER_CUTOFF_COEFF;
133 static const int FILTER_UPDATE_MASK;
134 VCAManipulator* pVCAManipulator;
135 VCFCManipulator* pVCFCManipulator;
136 VCOManipulator* pVCOManipulator;
137 LFO<gig::VCAManipulator>* pLFO1; ///< Low Frequency Oscillator 1 (Amplification)
138 LFO<gig::VCFCManipulator>* pLFO2; ///< Low Frequency Oscillator 2 (Filter cutoff frequency)
139 LFO<gig::VCOManipulator>* pLFO3; ///< Low Frequency Oscillator 3 (Pitch)
140 Pool<Event>::Iterator itTriggerEvent; ///< First event on the key's list the voice should process (only needed for the first audio fragment in which voice was triggered, after that it will be set to NULL).
141 //public: // FIXME: just made public for debugging (sanity check in Engine::RenderAudio()), should be changed to private before the final release
142 Pool<Event>::Iterator itKillEvent; ///< Event which caused this voice to be killed
143 //private:
144 int SynthesisMode;
145
146 // Static Methods
147 static float CalculateFilterCutoffCoeff();
148 static int CalculateFilterUpdateMask();
149
150 // Methods
151 void KillImmediately();
152 void ProcessEvents(uint Samples);
153 void CalculateBiquadParameters(uint Samples);
154 void Synthesize(uint Samples, sample_t* pSrc, uint Skip);
155
156 inline float CrossfadeAttenuation(uint8_t& CrossfadeControllerValue) {
157 float att = (!pDimRgn->Crossfade.out_end) ? CrossfadeControllerValue / 127.0f /* 0,0,0,0 means no crossfade defined */
158 : (CrossfadeControllerValue < pDimRgn->Crossfade.in_end) ?
159 ((CrossfadeControllerValue <= pDimRgn->Crossfade.in_start) ? 0.0f
160 : float(CrossfadeControllerValue - pDimRgn->Crossfade.in_start) / float(pDimRgn->Crossfade.in_end - pDimRgn->Crossfade.in_start))
161 : (CrossfadeControllerValue <= pDimRgn->Crossfade.out_start) ? 1.0f
162 : (CrossfadeControllerValue < pDimRgn->Crossfade.out_end) ? float(pDimRgn->Crossfade.out_end - CrossfadeControllerValue) / float(pDimRgn->Crossfade.out_end - pDimRgn->Crossfade.out_start)
163 : 0.0f;
164 return pDimRgn->InvertAttenuationController ? 1 - att : att;
165 }
166
167 inline float Constrain(float ValueToCheck, float Min, float Max) {
168 if (ValueToCheck > Max) ValueToCheck = Max;
169 else if (ValueToCheck < Min) ValueToCheck = Min;
170 return ValueToCheck;
171 }
172 };
173
174 }} // namespace LinuxSampler::gig
175
176 #endif // __LS_GIG_VOICE_H__

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