/[svn]/linuxsampler/trunk/src/audiothread.h
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Annotation of /linuxsampler/trunk/src/audiothread.h

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Mon Feb 16 19:30:42 2004 UTC (20 years, 2 months ago) by schoenebeck
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* implemented bidirectional voice state transition, means voice state can
  switch arbitrary times between 'Sustained'<-->'Released' within it's life
  time, thus the release process of a voice can be cancelled
* src/eg_vca.cpp: extended envelope generator by additional states
  ('Attack_Hold', 'Decay_1' and 'Decay_2')
* applied patch from Vladimir Senkov which adds new command line parameters
  ('--jackout', '--alsaout' and '--samplerate')
* configure.in: fixed compiler warning
1 schoenebeck 9 /***************************************************************************
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     #ifndef __AUDIOTHREAD_H__
24     #define __AUDIOTHREAD_H__
25    
26     #include <math.h>
27     #include <unistd.h>
28     #include <fcntl.h>
29    
30     #include "global.h"
31     #include "thread.h"
32     #include "ringbuffer.h"
33 schoenebeck 31 #include "audioio.h"
34 schoenebeck 9 #include "voice.h"
35     #include "gig.h"
36 senoner 10 #include "rtelmemorypool.h"
37 schoenebeck 30 #include "modulationsystem.h"
38 senoner 10
39 schoenebeck 32 #define PITCHBEND_SEMITONES 12
40     #define MAX_AUDIO_VOICES 64
41 schoenebeck 9
42     // preload 64k samples = 128kB of data in RAM for 16 bit mono samples
43 senoner 10 #define NUM_RAM_PRELOAD_SAMPLES 32768
44 schoenebeck 9
45 schoenebeck 32 // just symbol prototyping
46     class Voice;
47    
48 schoenebeck 31 //FIXME: Class name "AudioThread" is now misleading, because there is no thread anymore, but the name will change soon to "Engine" when we restructure the source tree
49     class AudioThread {
50 schoenebeck 9 public:
51 schoenebeck 20 double Volume; ///< overall volume (a value < 1.0 means attenuation, a value > 1.0 means amplification)
52     int ActiveVoiceCount; ///< number of currently active voices
53     int ActiveVoiceCountMax; ///< the maximum voice usage since application start
54 schoenebeck 12
55 schoenebeck 9 AudioThread(AudioIO* pAudioIO, DiskThread* pDiskThread, gig::Instrument* pInstrument);
56     ~AudioThread();
57 schoenebeck 32 void SendNoteOn(uint8_t Key, uint8_t Velocity);
58     void SendNoteOff(uint8_t Key, uint8_t Velocity);
59     void SendPitchbend(int Pitch);
60     void SendControlChange(uint8_t Controller, uint8_t Value);
61 schoenebeck 31 int RenderAudio(uint Samples);
62     inline float* GetAudioSumBuffer(uint Channel) {
63     return pAudioSumBuffer[Channel];
64     };
65 schoenebeck 32 protected:
66 schoenebeck 15 struct midi_key_info_t {
67 schoenebeck 32 RTEList<Voice>* pActiveVoices; ///< Contains the active voices associated with the MIDI key.
68     bool KeyPressed; ///< Is true if the respective MIDI key is currently pressed.
69 schoenebeck 33 bool Active; ///< If the key contains active voices.
70     uint* pSelf; ///< hack to allow fast deallocation of the key from the list of active keys
71     RTEList<ModulationSystem::Event>* pEvents; ///< Key specific events (only Note-on, Note-off and sustain pedal currently)
72 schoenebeck 12 };
73 senoner 10
74 schoenebeck 32 RingBuffer<ModulationSystem::Event>* pEventQueue; ///< Input event queue.
75     float* pAudioSumBuffer[2]; ///< Audio sum of all voices (32 bit, index 0 = left channel, index 1 = right channel)
76     midi_key_info_t pMIDIKeyInfo[128]; ///< Contains all active voices sorted by MIDI key number and other informations to the respective MIDI key
77     RTELMemoryPool<Voice>* pVoicePool; ///< Contains all voices that can be activated.
78 schoenebeck 33 RTELMemoryPool<uint>* pActiveKeys; ///< Holds all keys in it's allocation list with active voices.
79 schoenebeck 32 RTELMemoryPool<ModulationSystem::Event>* pEventPool; ///< Contains all Event objects that can be used.
80     RTEList<ModulationSystem::Event>* pEvents; ///< All events for the current audio fragment.
81     RTEList<ModulationSystem::Event>* pCCEvents[ModulationSystem::destination_count]; ///< Control change events for the current audio fragment.
82     AudioIO* pAudioIO;
83     DiskThread* pDiskThread;
84     gig::Instrument* pInstrument;
85     bool SustainPedal; ///< true if sustain pedal is down
86     uint8_t PrevHoldCCValue;
87     int Pitch; ///< Current (absolute) MIDI pitch value.
88 senoner 10
89 schoenebeck 32 void ProcessNoteOn(ModulationSystem::Event* pNoteOnEvent);
90     void ProcessNoteOff(ModulationSystem::Event* pNoteOffEvent);
91     void ProcessPitchbend(ModulationSystem::Event* pPitchbendEvent);
92     void ProcessControlChange(ModulationSystem::Event* pControlChangeEvent);
93 schoenebeck 30 void KillVoice(Voice* pVoice);
94 schoenebeck 9 void CacheInitialSamples(gig::Sample* pSample);
95 schoenebeck 32
96     friend class Voice;
97 schoenebeck 9 };
98    
99     #endif // __AUDIOTHREAD_H__
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