/[svn]/linuxsampler/tags/singlechannel/src/audiothread.h
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revision 10 by senoner, Tue Nov 11 23:30:47 2003 UTC revision 31 by schoenebeck, Sun Jan 18 20:31:31 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    
 #define DEBUG                   0  
39  #define PITCHBEND_SEMITONES     12  #define PITCHBEND_SEMITONES     12
40  #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 {  //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      public:      public:
48            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    
52          AudioThread(AudioIO* pAudioIO, DiskThread* pDiskThread, gig::Instrument* pInstrument);          AudioThread(AudioIO* pAudioIO, DiskThread* pDiskThread, gig::Instrument* pInstrument);
53         ~AudioThread();         ~AudioThread();
54          void ProcessNoteOn(uint8_t Pitch, uint8_t Velocity);          void          SendNoteOn(uint8_t Pitch, uint8_t Velocity);
55          void ProcessNoteOff(uint8_t Pitch, uint8_t Velocity);          void          SendNoteOff(uint8_t Pitch, uint8_t Velocity);
56          void ProcessContinuousController(uint8_t Channel, uint8_t Number, uint8_t Value);          void          SendControlChange(uint8_t Channel, uint8_t Number, uint8_t Value);
57            int           RenderAudio(uint Samples);
58          // the number of currently active streams          inline float* GetAudioSumBuffer(uint Channel) {
59          // printed on the console the main thread (along with the active streams count)              return pAudioSumBuffer[Channel];
60          int ActiveVoiceCount;          };
   
     protected:  
         int Main(); ///< Implementation of virtual method from class Thread  
61      private:      private:
62          enum command_type_t {          enum command_type_t {
63              command_type_note_on,              command_type_note_on,
# Line 73  class AudioThread : public Thread { Line 72  class AudioThread : public Thread {
72              uint8_t        number;              uint8_t        number;
73              uint8_t        value;              uint8_t        value;
74          } command;          } command;
75          RingBuffer<command_t>* pCommandQueue;          struct midi_key_info_t {
76          float*                 pAudioSumBuffer;    ///< Audio sum of all voices (32 bit)              RTEList<Voice*>*             pActiveVoices;         ///< Contains the active voices associated with the MIDI key.
77          Voice**                pVoices;            ///< The voice pool, containing all Voices (active and inactice voices) in unsorted order              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            };
82    
83          RTEList<Voice *> *pActiveVoices[128];  ///< Contains all active voices sorted by MIDI key number          RingBuffer<command_t>*           pCommandQueue;
84            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          /* ActiveVoicePool is a memory pool of limited size (size=MAX VOICES) of active voices.          /* 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             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             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             active voices per key. This if for example useful to manage the sustain pedal messages
91           */           */
92          RTELMemoryPool<Voice *> *ActiveVoicePool;          RTELMemoryPool<Voice*>*          ActiveVoicePool;
93          /* SustainedVoicePool is a dynamically allocated pool (size=MAX VOICES) and list of notes          RTELMemoryPool<uint>*            SustainedKeyPool;      ///< Contains the MIDI key numbers of all currently sustained keys.
94             notes that were sustained and where the corresponding MIDI note-off arrived          AudioIO*                         pAudioIO;
95             but cannot processed yet. Basically when the sustain pedal is pressed and the          DiskThread*                      pDiskThread;
96             note-off on a certain midi key arrives. notes are not deleted from the          gig::Instrument*                 pInstrument;
97             ActiveVoices[MIDIKey] list but an element is added in the SustainedVoicePool,          bool                             SustainPedal;          ///< true if sustain pedal is down
98             which is a dynamically allocated pool with a builtin list.          uint8_t                          PrevHoldCCValue;
99             Then the pedal is finally released, this list is traversed and all elements  
100             in the lists ActiveVoices[MIDIKey] ( where MIDIKey is contained in the list of          void ProcessNoteOn(uint8_t MIDIKey, uint8_t Velocity);
101             sustained voices) are processed (voices are released)          void ProcessNoteOff(uint8_t MIDIKey, uint8_t Velocity);
102          */          void ProcessControlChange(uint8_t Channel, uint8_t Number, uint8_t Value);
103            void KillVoice(Voice* pVoice);
         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;  
   
   
   
         AudioIO*               pAudioIO;  
         DiskThread*            pDiskThread;  
         gig::Instrument*       pInstrument;  
   
         void ActivateVoice(uint8_t MIDIKey, uint8_t Velocity);  
         void ReleaseVoice(uint8_t MIDIKey, uint8_t Velocity);  
         void ContinuousController(uint8_t Channel, uint8_t Number, uint8_t Value);  
         
104          void CacheInitialSamples(gig::Sample* pSample);          void CacheInitialSamples(gig::Sample* pSample);
105  };  };
106    
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