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

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Revision 12 - (show annotations) (download) (as text)
Sun Nov 16 19:01:50 2003 UTC (15 years, 8 months ago) by schoenebeck
File MIME type: text/x-c++hdr
File size: 5530 byte(s)
* src/gig.cpp: fixed bug in decompression algorithm which caused it not to
  detect the end of a stream and let the disk streams reload forever also
  resulting in strange sounds at the end of disk voices (concerned only
  playback of compressed gig files)
* src/audiothread.cpp: deallocation of voices when they reached the end of
  playback (thus e.g. when sustain pedal is pressed and a disk stream
  reached it's end)
* various endian corrections needed for non intel systems
* introduced debug level, you can set the debug level and thus the
  verbosity of LinuxSampler in src/global.h

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
39 #include "rtelmemorypool.h"
40
41 #define DEBUG 0
42 #define PITCHBEND_SEMITONES 12
43 #define MAX_AUDIO_VOICES 64
44
45 // preload 64k samples = 128kB of data in RAM for 16 bit mono samples
46 #define NUM_RAM_PRELOAD_SAMPLES 32768
47
48 class AudioThread : public Thread {
49 public:
50 int ActiveVoiceCount; ///< number of currently active voices
51
52 AudioThread(AudioIO* pAudioIO, DiskThread* pDiskThread, gig::Instrument* pInstrument);
53 ~AudioThread();
54 void ProcessNoteOn(uint8_t Pitch, uint8_t Velocity);
55 void ProcessNoteOff(uint8_t Pitch, uint8_t Velocity);
56 void ProcessContinuousController(uint8_t Channel, uint8_t Number, uint8_t Value);
57 protected:
58 int Main(); ///< Implementation of virtual method from class Thread
59 private:
60 enum command_type_t {
61 command_type_note_on,
62 command_type_note_off,
63 command_type_continuous_controller
64 };
65 struct command_t {
66 command_type_t type;
67 uint8_t channel;
68 uint8_t pitch;
69 uint8_t velocity;
70 uint8_t number;
71 uint8_t value;
72 } command;
73 struct sustained_key_t {
74 int midikey;
75 int velocity;
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 RTEList<Voice *>* pActiveVoices[128]; ///< Contains all active voices sorted by MIDI key number
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 /* SustainedVoicePool is a dynamically allocated pool (size=MAX VOICES) and list of notes
89 notes that were sustained and where the corresponding MIDI note-off arrived
90 but cannot processed yet. Basically when the sustain pedal is pressed and the
91 note-off on a certain midi key arrives. notes are not deleted from the
92 ActiveVoices[MIDIKey] list but an element is added in the SustainedVoicePool,
93 which is a dynamically allocated pool with a builtin list.
94 Then the pedal is finally released, this list is traversed and all elements
95 in the lists ActiveVoices[MIDIKey] ( where MIDIKey is contained in the list of
96 sustained voices) are processed (voices are released)
97 */
98 RTELMemoryPool<sustained_key_t>* SustainedKeyPool;
99 AudioIO* pAudioIO;
100 DiskThread* pDiskThread;
101 gig::Instrument* pInstrument;
102 bool SustainPedal; ///< true if sustain pedal is down
103 uint8_t PrevHoldCCValue;
104
105 void ActivateVoice(uint8_t MIDIKey, uint8_t Velocity);
106 void ReleaseVoice(uint8_t MIDIKey, uint8_t Velocity);
107 void ReleaseVoice(Voice* pVoice);
108 void ContinuousController(uint8_t Channel, uint8_t Number, uint8_t Value);
109 void CacheInitialSamples(gig::Sample* pSample);
110 };
111
112 #endif // __AUDIOTHREAD_H__

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