/[svn]/linuxsampler/tags/v0_1_0/src/audiothread.h
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revision 10 by senoner, Tue Nov 11 23:30:47 2003 UTC revision 33 by schoenebeck, Mon Feb 16 19:30:42 2004 UTC
# Line 23  Line 23 
23  #ifndef __AUDIOTHREAD_H__  #ifndef __AUDIOTHREAD_H__
24  #define __AUDIOTHREAD_H__  #define __AUDIOTHREAD_H__
25    
 #include <stdio.h>  
 #include <stdlib.h>  
26  #include <math.h>  #include <math.h>
27  #include <unistd.h>  #include <unistd.h>
28  #include <fcntl.h>  #include <fcntl.h>
# Line 32  Line 30 
30  #include "global.h"  #include "global.h"
31  #include "thread.h"  #include "thread.h"
32  #include "ringbuffer.h"  #include "ringbuffer.h"
 #include "voice.h"  
33  #include "audioio.h"  #include "audioio.h"
34    #include "voice.h"
35  #include "gig.h"  #include "gig.h"
   
36  #include "rtelmemorypool.h"  #include "rtelmemorypool.h"
37    #include "modulationsystem.h"
38    
39  #define DEBUG                   0  #define PITCHBEND_SEMITONES             12
40  #define PITCHBEND_SEMITONES     12  #define MAX_AUDIO_VOICES                64
 #define MAX_AUDIO_VOICES        64  
41    
42  // preload 64k samples = 128kB of data in RAM for 16 bit mono samples  // preload 64k samples = 128kB of data in RAM for 16 bit mono samples
43  #define NUM_RAM_PRELOAD_SAMPLES 32768  #define NUM_RAM_PRELOAD_SAMPLES 32768
44    
45  class AudioThread : public Thread {  // just symbol prototyping
46    class Voice;
47    
48    //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      public:      public:
51            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    
55          AudioThread(AudioIO* pAudioIO, DiskThread* pDiskThread, gig::Instrument* pInstrument);          AudioThread(AudioIO* pAudioIO, DiskThread* pDiskThread, gig::Instrument* pInstrument);
56         ~AudioThread();         ~AudioThread();
57          void ProcessNoteOn(uint8_t Pitch, uint8_t Velocity);          void          SendNoteOn(uint8_t Key, uint8_t Velocity);
58          void ProcessNoteOff(uint8_t Pitch, uint8_t Velocity);          void          SendNoteOff(uint8_t Key, uint8_t Velocity);
59          void ProcessContinuousController(uint8_t Channel, uint8_t Number, uint8_t Value);          void          SendPitchbend(int Pitch);
60            void          SendControlChange(uint8_t Controller, uint8_t Value);
61          // the number of currently active streams          int           RenderAudio(uint Samples);
62          // printed on the console the main thread (along with the active streams count)          inline float* GetAudioSumBuffer(uint Channel) {
63          int ActiveVoiceCount;              return pAudioSumBuffer[Channel];
64            };
65      protected:      protected:
66          int Main(); ///< Implementation of virtual method from class Thread          struct midi_key_info_t {
67      private:              RTEList<Voice>*                      pActiveVoices;         ///< Contains the active voices associated with the MIDI key.
68          enum command_type_t {              bool                                 KeyPressed;            ///< Is true if the respective MIDI key is currently pressed.
69              command_type_note_on,              bool                                 Active;                ///< If the key contains active voices.
70              command_type_note_off,              uint*                                pSelf;                 ///< hack to allow fast deallocation of the key from the list of active keys
71              command_type_continuous_controller              RTEList<ModulationSystem::Event>*    pEvents;               ///< Key specific events (only Note-on, Note-off and sustain pedal currently)
72          };          };
         struct command_t {  
             command_type_t type;  
             uint8_t        channel;  
             uint8_t        pitch;  
             uint8_t        velocity;  
             uint8_t        number;  
             uint8_t        value;  
         } command;  
         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)  
         */  
   
         typedef struct {  
                          int midikey;  
                          int velocity;  
                        } sustained_key_t;  
   
         RTELMemoryPool<sustained_key_t> *SustainedKeyPool;  
   
         uint8_t PrevHoldCCValue;  
         // SustainPedal = 1 if the sustain pedal is down, otherwise it is 0  
         uint8_t SustainPedal;  
   
73    
74            RingBuffer<ModulationSystem::Event>*     pEventQueue;           ///< Input event queue.
75          AudioIO*               pAudioIO;          float*                                   pAudioSumBuffer[2];    ///< Audio sum of all voices (32 bit, index 0 = left channel, index 1 = right channel)
76          DiskThread*            pDiskThread;          midi_key_info_t                          pMIDIKeyInfo[128];     ///< Contains all active voices sorted by MIDI key number and other informations to the respective MIDI key
77          gig::Instrument*       pInstrument;          RTELMemoryPool<Voice>*                   pVoicePool;            ///< Contains all voices that can be activated.
78            RTELMemoryPool<uint>*                    pActiveKeys;           ///< Holds all keys in it's allocation list with active voices.
79          void ActivateVoice(uint8_t MIDIKey, uint8_t Velocity);          RTELMemoryPool<ModulationSystem::Event>* pEventPool;            ///< Contains all Event objects that can be used.
80          void ReleaseVoice(uint8_t MIDIKey, uint8_t Velocity);          RTEList<ModulationSystem::Event>*        pEvents;               ///< All events for the current audio fragment.
81          void ContinuousController(uint8_t Channel, uint8_t Number, uint8_t Value);          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    
89            void ProcessNoteOn(ModulationSystem::Event* pNoteOnEvent);
90            void ProcessNoteOff(ModulationSystem::Event* pNoteOffEvent);
91            void ProcessPitchbend(ModulationSystem::Event* pPitchbendEvent);
92            void ProcessControlChange(ModulationSystem::Event* pControlChangeEvent);
93            void KillVoice(Voice* pVoice);
94          void CacheInitialSamples(gig::Sample* pSample);          void CacheInitialSamples(gig::Sample* pSample);
95    
96            friend class Voice;
97  };  };
98    
99  #endif // __AUDIOTHREAD_H__  #endif // __AUDIOTHREAD_H__
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