/[svn]/linuxsampler/trunk/src/engines/gig/EGDecay.cpp
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Contents of /linuxsampler/trunk/src/engines/gig/EGDecay.cpp

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Revision 53 - (show annotations) (download)
Mon Apr 26 17:15:51 2004 UTC (19 years, 11 months ago) by schoenebeck
File size: 3410 byte(s)
* completely restructured source tree
* implemented multi channel support
* implemented instrument manager, which controls sharing of instruments
  between multiple sampler engines / sampler channels
* created abstract classes 'AudioOutputDevice' and 'MidiInputDevice' for
  convenient implementation of further audio output driver and MIDI input
  driver for LinuxSampler
* implemented following LSCP commands: 'SET CHANNEL MIDI INPUT TYPE',
  'LOAD ENGINE', 'GET CHANNELS', 'ADD CHANNEL', 'REMOVE CHANNEL',
  'SET CHANNEL AUDIO OUTPUT TYPE'
* temporarily removed all command line options
* LSCP server is now launched by default

1 /***************************************************************************
2 * *
3 * LinuxSampler - modular, streaming capable sampler *
4 * *
5 * Copyright (C) 2003 by Benno Senoner and Christian Schoenebeck *
6 * *
7 * This program is free software; you can redistribute it and/or modify *
8 * it under the terms of the GNU General Public License as published by *
9 * the Free Software Foundation; either version 2 of the License, or *
10 * (at your option) any later version. *
11 * *
12 * This program is distributed in the hope that it will be useful, *
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
15 * GNU General Public License for more details. *
16 * *
17 * You should have received a copy of the GNU General Public License *
18 * along with this program; if not, write to the Free Software *
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, *
20 * MA 02111-1307 USA *
21 ***************************************************************************/
22
23 #include "EGDecay.h"
24
25 namespace LinuxSampler { namespace gig {
26
27 EGDecay::EGDecay(gig::Engine* pEngine, Event::destination_t ModulationDestination) {
28 this->ModulationDestination = ModulationDestination;
29 this->pEngine = pEngine;
30 }
31
32 /**
33 * Will be called by the voice for every audio fragment to let the EG
34 * queue it's modulation changes for the current audio fragment.
35 *
36 * @param Samples - total number of sample points to be rendered in this
37 * audio fragment cycle by the audio engine
38 */
39 void EGDecay::Process(uint Samples) {
40 if (!DecayStepsLeft) return;
41
42 int iSample = TriggerDelay;
43 int to_process = RTMath::Min(Samples - iSample, DecayStepsLeft);
44 int process_end = iSample + to_process;
45 DecayStepsLeft -= to_process;
46 while (iSample < to_process) {
47 pEngine->pSynthesisParameters[ModulationDestination][iSample++] *= Level;
48 Level += DecayCoeff;
49 }
50 TriggerDelay = 0;
51 }
52
53 /**
54 * Will be called by the voice when the key / voice was triggered.
55 *
56 * @param Depth - Initial level of the envelope
57 * @param DecayTime - Decay time of the envelope (0.000 - 10.000s)
58 * @param Delay - Number of sample points triggering should be delayed.
59 */
60 void EGDecay::Trigger(float Depth, double DecayTime, uint Delay) {
61 this->TriggerDelay = Delay;
62 this->Level = Depth;
63
64 // calculate decay parameters (lin. curve)
65 DecayStepsLeft = (long) (DecayTime * pEngine->pAudioOutputDevice->SampleRate());
66 DecayCoeff = (1.0 - Depth) / DecayStepsLeft;
67
68 dmsg(4,("Depth=%d, DecayTime=%f\n", Depth, DecayTime));
69 }
70
71 }} // namespace LinuxSampler::gig

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