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

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

#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

//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
class AudioThread {
    public:
        double Volume;               ///< overall volume (a value < 1.0 means attenuation, a value > 1.0 means amplification)
        int    ActiveVoiceCount;     ///< number of currently active voices
        int    ActiveVoiceCountMax;  ///< the maximum voice usage since application start

        AudioThread(AudioIO* pAudioIO, DiskThread* pDiskThread, gig::Instrument* pInstrument);
       ~AudioThread();
        void          SendNoteOn(uint8_t Pitch, uint8_t Velocity);
        void          SendNoteOff(uint8_t Pitch, uint8_t Velocity);
        void          SendControlChange(uint8_t Channel, uint8_t Number, uint8_t Value);
        int           RenderAudio(uint Samples);
        inline float* GetAudioSumBuffer(uint Channel) {
            return pAudioSumBuffer[Channel];
        };
    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 midi_key_info_t {
            RTEList<Voice*>*             pActiveVoices;         ///< Contains the active voices associated with the MIDI key.
            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)
            bool                         Sustained;             ///< Is true if the MIDI key is currently sustained, thus if Note-off arrived while sustain pedal pressed.
            bool                         KeyPressed;            ///< Is true if the respective MIDI key is currently pressed.
            uint*                        pSustainPoolNode;      ///< FIXME: hack to allow fast deallocation of the key from the sustained key pool
        };

        RingBuffer<command_t>*           pCommandQueue;
        float*                           pAudioSumBuffer[2];    ///< Audio sum of all voices (32 bit, index 0 = left channel, index 1 = right channel)
        Voice**                          pVoices;               ///< The voice pool, containing all Voices (active and inactice voices) in unsorted order
        midi_key_info_t                  pMIDIKeyInfo[128];     ///< Contains all active voices sorted by MIDI key number and other informations to the respective MIDI key
        /* 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;
        RTELMemoryPool<uint>*            SustainedKeyPool;      ///< Contains the MIDI key numbers of all currently sustained keys.
        AudioIO*                         pAudioIO;
        DiskThread*                      pDiskThread;
        gig::Instrument*                 pInstrument;
        bool                             SustainPedal;          ///< true if sustain pedal is down
        uint8_t                          PrevHoldCCValue;

        void ProcessNoteOn(uint8_t MIDIKey, uint8_t Velocity);
        void ProcessNoteOff(uint8_t MIDIKey, uint8_t Velocity);
        void ProcessControlChange(uint8_t Channel, uint8_t Number, uint8_t Value);
        void KillVoice(Voice* pVoice);
        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 <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	9	#define PITCHBEND_SEMITONES 12
40			#define MAX_AUDIO_VOICES 64
41
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	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
46			class AudioThread {
47	schoenebeck	9	public:
48	schoenebeck	20	double Volume; ///< overall volume (a value < 1.0 means attenuation, a value > 1.0 means amplification)
49			int ActiveVoiceCount; ///< number of currently active voices
50			int ActiveVoiceCountMax; ///< the maximum voice usage since application start
51	schoenebeck	12
52	schoenebeck	9	AudioThread(AudioIO* pAudioIO, DiskThread* pDiskThread, gig::Instrument* pInstrument);
53			~AudioThread();
54	schoenebeck	31	void SendNoteOn(uint8_t Pitch, uint8_t Velocity);
55			void SendNoteOff(uint8_t Pitch, uint8_t Velocity);
56			void SendControlChange(uint8_t Channel, uint8_t Number, uint8_t Value);
57			int RenderAudio(uint Samples);
58			inline float* GetAudioSumBuffer(uint Channel) {
59			return pAudioSumBuffer[Channel];
60			};
61	schoenebeck	9	private:
62			enum command_type_t {
63			command_type_note_on,
64	senoner	10	command_type_note_off,
65			command_type_continuous_controller
66	schoenebeck	9	};
67			struct command_t {
68			command_type_t type;
69	senoner	10	uint8_t channel;
70	schoenebeck	9	uint8_t pitch;
71			uint8_t velocity;
72	senoner	10	uint8_t number;
73			uint8_t value;
74	schoenebeck	9	} command;
75	schoenebeck	15	struct midi_key_info_t {
76	schoenebeck	31	RTEList<Voice> pActiveVoices; ///< Contains the active voices associated with the MIDI key.
77			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)
78			bool Sustained; ///< Is true if the MIDI key is currently sustained, thus if Note-off arrived while sustain pedal pressed.
79			bool KeyPressed; ///< Is true if the respective MIDI key is currently pressed.
80			uint* pSustainPoolNode; ///< FIXME: hack to allow fast deallocation of the key from the sustained key pool
81	schoenebeck	12	};
82	senoner	10
83	schoenebeck	12	RingBuffer<command_t>* pCommandQueue;
84	schoenebeck	31	float* pAudioSumBuffer[2]; ///< Audio sum of all voices (32 bit, index 0 = left channel, index 1 = right channel)
85			Voice** pVoices; ///< The voice pool, containing all Voices (active and inactice voices) in unsorted order
86			midi_key_info_t pMIDIKeyInfo[128]; ///< Contains all active voices sorted by MIDI key number and other informations to the respective MIDI key
87	senoner	10	/* ActiveVoicePool is a memory pool of limited size (size=MAX VOICES) of active voices.
88			it can be allocated dynamically in real time and the allocated elements can be added to
89			the linked lists represented by ActiveVoices[MIDIKey]. This means we can have unlimited
90			active voices per key. This if for example useful to manage the sustain pedal messages
91			*/
92	schoenebeck	15	RTELMemoryPool<Voice> ActiveVoicePool;
93	schoenebeck	31	RTELMemoryPool<uint>* SustainedKeyPool; ///< Contains the MIDI key numbers of all currently sustained keys.
94	schoenebeck	12	AudioIO* pAudioIO;
95			DiskThread* pDiskThread;
96			gig::Instrument* pInstrument;
97	schoenebeck	31	bool SustainPedal; ///< true if sustain pedal is down
98	schoenebeck	12	uint8_t PrevHoldCCValue;
99	senoner	10
100	schoenebeck	18	void ProcessNoteOn(uint8_t MIDIKey, uint8_t Velocity);
101			void ProcessNoteOff(uint8_t MIDIKey, uint8_t Velocity);
102			void ProcessControlChange(uint8_t Channel, uint8_t Number, uint8_t Value);
103	schoenebeck	30	void KillVoice(Voice* pVoice);
104	schoenebeck	9	void CacheInitialSamples(gig::Sample* pSample);
105			};
106
107			#endif // __AUDIOTHREAD_H__