trunk/src/audiothread.h

/***************************************************************************
 *                                                                         *
 *   LinuxSampler - modular, streaming capable sampler                     *
 *                                                                         *
 *   Copyright (C) 2003 by Benno Senoner and Christian Schoenebeck         *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the Free Software           *
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston,                 *
 *   MA  02111-1307  USA                                                   *
 ***************************************************************************/

#ifndef __AUDIOTHREAD_H__
#define __AUDIOTHREAD_H__

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <unistd.h>
#include <fcntl.h>

#include "global.h"
#include "thread.h"
#include "ringbuffer.h"
#include "voice.h"
#include "audioio.h"
#include "gig.h"

#include "rtelmemorypool.h"

#define DEBUG                   0
#define PITCHBEND_SEMITONES     12
#define MAX_AUDIO_VOICES        64

// preload 64k samples = 128kB of data in RAM for 16 bit mono samples
#define NUM_RAM_PRELOAD_SAMPLES 32768

class AudioThread : public Thread {
    public:
        int ActiveVoiceCount;  ///< number of currently active voices

        AudioThread(AudioIO* pAudioIO, DiskThread* pDiskThread, gig::Instrument* pInstrument);
       ~AudioThread();
        void ProcessNoteOn(uint8_t Pitch, uint8_t Velocity);
        void ProcessNoteOff(uint8_t Pitch, uint8_t Velocity);
        void ProcessContinuousController(uint8_t Channel, uint8_t Number, uint8_t Value);
    protected:
        int Main(); ///< Implementation of virtual method from class Thread
    private:
        enum command_type_t {
            command_type_note_on,
            command_type_note_off,
            command_type_continuous_controller
        };
        struct command_t {
            command_type_t type;
            uint8_t        channel;
            uint8_t        pitch;
            uint8_t        velocity;
            uint8_t        number;
            uint8_t        value;
        } command;
        struct sustained_key_t {
            int midikey;
            int velocity;
        };

        RingBuffer<command_t>*           pCommandQueue;
        float*                           pAudioSumBuffer;    ///< Audio sum of all voices (32 bit)
        Voice**                          pVoices;            ///< The voice pool, containing all Voices (active and inactice voices) in unsorted order
        RTEList<Voice *>*                pActiveVoices[128]; ///< Contains all active voices sorted by MIDI key number
        /* ActiveVoicePool is a memory pool of limited size (size=MAX VOICES) of active voices.
           it can be allocated dynamically in real time and the allocated elements can be added to
           the linked lists represented by ActiveVoices[MIDIKey]. This means we can have unlimited
           active voices per key. This if for example useful to manage the sustain pedal messages
         */
        RTELMemoryPool<Voice *>*         ActiveVoicePool;
        /* SustainedVoicePool is a dynamically allocated pool (size=MAX VOICES) and list of notes
           notes that were sustained and where the corresponding MIDI note-off arrived
           but cannot processed yet. Basically when the sustain pedal is pressed and the
           note-off on a certain midi key arrives. notes are not deleted from the
           ActiveVoices[MIDIKey] list but an element is added in the SustainedVoicePool,
           which is a dynamically allocated pool with a builtin list.
           Then the pedal is finally released, this list is traversed and all elements
           in the lists ActiveVoices[MIDIKey] ( where MIDIKey is contained in the list of
           sustained voices) are processed (voices are released)
        */
        RTELMemoryPool<sustained_key_t>* SustainedKeyPool;
        AudioIO*                         pAudioIO;
        DiskThread*                      pDiskThread;
        gig::Instrument*                 pInstrument;
        bool                             SustainPedal;  ///< true if sustain pedal is down
        uint8_t                          PrevHoldCCValue;

        void ActivateVoice(uint8_t MIDIKey, uint8_t Velocity);
        void ReleaseVoice(uint8_t MIDIKey, uint8_t Velocity);
        void ReleaseVoice(Voice* pVoice);
        void ContinuousController(uint8_t Channel, uint8_t Number, uint8_t Value);
        void CacheInitialSamples(gig::Sample* pSample);
};

#endif // __AUDIOTHREAD_H__
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 <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	senoner	10	#include "rtelmemorypool.h"
40
41	schoenebeck	9	#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	senoner	10	#define NUM_RAM_PRELOAD_SAMPLES 32768
47	schoenebeck	9
48			class AudioThread : public Thread {
49			public:
50	schoenebeck	12	int ActiveVoiceCount; ///< number of currently active voices
51
52	schoenebeck	9	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	senoner	10	void ProcessContinuousController(uint8_t Channel, uint8_t Number, uint8_t Value);
57	schoenebeck	9	protected:
58			int Main(); ///< Implementation of virtual method from class Thread
59			private:
60			enum command_type_t {
61			command_type_note_on,
62	senoner	10	command_type_note_off,
63			command_type_continuous_controller
64	schoenebeck	9	};
65			struct command_t {
66			command_type_t type;
67	senoner	10	uint8_t channel;
68	schoenebeck	9	uint8_t pitch;
69			uint8_t velocity;
70	senoner	10	uint8_t number;
71			uint8_t value;
72	schoenebeck	9	} command;
73	schoenebeck	12	struct sustained_key_t {
74			int midikey;
75			int velocity;
76			};
77	senoner	10
78	schoenebeck	12	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	senoner	10	/* 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	schoenebeck	12	RTELMemoryPool<Voice > ActiveVoicePool;
88	senoner	10	/* 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	schoenebeck	12	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	senoner	10
105	schoenebeck	9	void ActivateVoice(uint8_t MIDIKey, uint8_t Velocity);
106			void ReleaseVoice(uint8_t MIDIKey, uint8_t Velocity);
107	schoenebeck	12	void ReleaseVoice(Voice* pVoice);
108	senoner	10	void ContinuousController(uint8_t Channel, uint8_t Number, uint8_t Value);
109	schoenebeck	9	void CacheInitialSamples(gig::Sample* pSample);
110			};
111
112			#endif // __AUDIOTHREAD_H__