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

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Revision 15 - (show annotations) (download) (as text)
Sun Nov 23 21:16:49 2003 UTC (20 years, 4 months ago) by schoenebeck
File MIME type: text/x-c++hdr
File size: 5392 byte(s)
* rewrote sustain pedal handling: instead of just queuing the note-offs I
  added a sustain pointer for each midi key which starts to point to the
  first active voice on the respective key and increments to the next voice
  on the key when a note-off arrived, the release velocity value will
  immediately be stored in the respective voice object (this also fixes the
  segmentation fault issue when the sustain pool was full)

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 #ifndef __AUDIOTHREAD_H__
24 #define __AUDIOTHREAD_H__
25
26 #include <stdio.h>
27 #include <stdlib.h>
28 #include <math.h>
29 #include <unistd.h>
30 #include <fcntl.h>
31
32 #include "global.h"
33 #include "thread.h"
34 #include "ringbuffer.h"
35 #include "voice.h"
36 #include "audioio.h"
37 #include "gig.h"
38 #include "rtelmemorypool.h"
39
40 #define PITCHBEND_SEMITONES 12
41 #define MAX_AUDIO_VOICES 64
42
43 // preload 64k samples = 128kB of data in RAM for 16 bit mono samples
44 #define NUM_RAM_PRELOAD_SAMPLES 32768
45
46 class AudioThread : public Thread {
47 public:
48 int ActiveVoiceCount; ///< number of currently active voices
49 int ActiveVoiceCountMax; ///< the maximum voice usage since application start
50
51 AudioThread(AudioIO* pAudioIO, DiskThread* pDiskThread, gig::Instrument* pInstrument);
52 ~AudioThread();
53 void ProcessNoteOn(uint8_t Pitch, uint8_t Velocity);
54 void ProcessNoteOff(uint8_t Pitch, uint8_t Velocity);
55 void ProcessContinuousController(uint8_t Channel, uint8_t Number, uint8_t Value);
56 protected:
57 int Main(); ///< Implementation of virtual method from class Thread
58 private:
59 enum command_type_t {
60 command_type_note_on,
61 command_type_note_off,
62 command_type_continuous_controller
63 };
64 struct command_t {
65 command_type_t type;
66 uint8_t channel;
67 uint8_t pitch;
68 uint8_t velocity;
69 uint8_t number;
70 uint8_t value;
71 } command;
72 struct midi_key_info_t {
73 RTEList<Voice*>* pActiveVoices; ///< Contains the active voices associated with the MIDI key.
74 RTEList<Voice*>::NodeHandle hSustainPtr; ///< Points to the voice element in the active voice list which has not received a note-off yet (this pointer is needed for sustain pedal handling)
75 bool Sustained; ///< Is true if the MIDI key is currently sustained, thus if Note-off arrived while sustain pedal pressed.
76 };
77
78 RingBuffer<command_t>* pCommandQueue;
79 float* pAudioSumBuffer; ///< Audio sum of all voices (32 bit)
80 Voice** pVoices; ///< The voice pool, containing all Voices (active and inactice voices) in unsorted order
81 midi_key_info_t pMIDIKeyInfo[128]; ///< Contains all active voices sorted by MIDI key number and other informations to the respective MIDI key
82 /* ActiveVoicePool is a memory pool of limited size (size=MAX VOICES) of active voices.
83 it can be allocated dynamically in real time and the allocated elements can be added to
84 the linked lists represented by ActiveVoices[MIDIKey]. This means we can have unlimited
85 active voices per key. This if for example useful to manage the sustain pedal messages
86 */
87 RTELMemoryPool<Voice*>* ActiveVoicePool;
88 RTELMemoryPool<uint>* SustainedKeyPool; ///< Contains the MIDI key numbers of all currently sustained keys.
89 AudioIO* pAudioIO;
90 DiskThread* pDiskThread;
91 gig::Instrument* pInstrument;
92 bool SustainPedal; ///< true if sustain pedal is down
93 uint8_t PrevHoldCCValue;
94
95 void ActivateVoice(uint8_t MIDIKey, uint8_t Velocity);
96 void ReleaseVoice(uint8_t MIDIKey, uint8_t Velocity);
97 void ReleaseVoice(Voice* pVoice);
98 void ContinuousController(uint8_t Channel, uint8_t Number, uint8_t Value);
99 void CacheInitialSamples(gig::Sample* pSample);
100 };
101
102 #endif // __AUDIOTHREAD_H__

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