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/*************************************************************************** |
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* * |
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* LinuxSampler - modular, streaming capable sampler * |
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* * |
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* Copyright (C) 2003 by Benno Senoner and Christian Schoenebeck * |
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* * |
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* This program is free software; you can redistribute it and/or modify * |
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* it under the terms of the GNU General Public License as published by * |
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* the Free Software Foundation; either version 2 of the License, or * |
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* (at your option) any later version. * |
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* * |
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* This program is distributed in the hope that it will be useful, * |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of * |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * |
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* GNU General Public License for more details. * |
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* * |
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* You should have received a copy of the GNU General Public License * |
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* along with this program; if not, write to the Free Software * |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, * |
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* MA 02111-1307 USA * |
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***************************************************************************/ |
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|
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#ifndef __AUDIOTHREAD_H__ |
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#define __AUDIOTHREAD_H__ |
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|
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#include <math.h> |
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#include <unistd.h> |
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#include <fcntl.h> |
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|
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#include "global.h" |
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#include "thread.h" |
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#include "ringbuffer.h" |
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#include "audioio.h" |
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#include "voice.h" |
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#include "gig.h" |
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#include "rtelmemorypool.h" |
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#include "modulationsystem.h" |
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|
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#define PITCHBEND_SEMITONES 12 |
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#define MAX_AUDIO_VOICES 64 |
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#define MAX_EVENTS_PER_FRAGMENT 1024 |
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|
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// preload 64k samples = 128kB of data in RAM for 16 bit mono samples |
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#define NUM_RAM_PRELOAD_SAMPLES 32768 |
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|
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// just symbol prototyping |
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class Voice; |
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|
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//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 |
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class AudioThread { |
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public: |
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double Volume; ///< overall volume (a value < 1.0 means attenuation, a value > 1.0 means amplification) |
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int ActiveVoiceCount; ///< number of currently active voices |
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int ActiveVoiceCountMax; ///< the maximum voice usage since application start |
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|
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AudioThread(AudioIO* pAudioIO, DiskThread* pDiskThread, gig::Instrument* pInstrument); |
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~AudioThread(); |
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void SendNoteOn(uint8_t Key, uint8_t Velocity); |
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void SendNoteOff(uint8_t Key, uint8_t Velocity); |
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void SendPitchbend(int Pitch); |
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void SendControlChange(uint8_t Controller, uint8_t Value); |
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int RenderAudio(uint Samples); |
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inline float* GetAudioSumBuffer(uint Channel) { |
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return pAudioSumBuffer[Channel]; |
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}; |
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protected: |
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struct midi_key_info_t { |
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RTEList<Voice>* pActiveVoices; ///< Contains the active voices associated with the MIDI key. |
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Voice* pSustainPtr; ///< 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) |
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bool Sustained; ///< Is true if the MIDI key is currently sustained, thus if Note-off arrived while sustain pedal pressed. |
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bool KeyPressed; ///< Is true if the respective MIDI key is currently pressed. |
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uint* pSustainPoolNode; ///< FIXME: hack to allow fast deallocation of the key from the sustained key pool |
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}; |
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|
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RingBuffer<ModulationSystem::Event>* pEventQueue; ///< Input event queue. |
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float* pAudioSumBuffer[2]; ///< Audio sum of all voices (32 bit, index 0 = left channel, index 1 = right channel) |
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midi_key_info_t pMIDIKeyInfo[128]; ///< Contains all active voices sorted by MIDI key number and other informations to the respective MIDI key |
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/* ActiveVoicePool is a memory pool of limited size (size=MAX VOICES) of active voices. |
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it can be allocated dynamically in real time and the allocated elements can be added to |
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the linked lists represented by ActiveVoices[MIDIKey]. This means we can have unlimited |
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active voices per key. This if for example useful to manage the sustain pedal messages |
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*/ |
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RTELMemoryPool<Voice>* pVoicePool; ///< Contains all voices that can be activated. |
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RTELMemoryPool<uint>* pSustainedKeyPool; ///< Contains the MIDI key numbers of all currently sustained keys. |
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RTELMemoryPool<ModulationSystem::Event>* pEventPool; ///< Contains all Event objects that can be used. |
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RTEList<ModulationSystem::Event>* pEvents; ///< All events for the current audio fragment. |
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RTEList<ModulationSystem::Event>* pCCEvents[ModulationSystem::destination_count]; ///< Control change events for the current audio fragment. |
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AudioIO* pAudioIO; |
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DiskThread* pDiskThread; |
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gig::Instrument* pInstrument; |
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bool SustainPedal; ///< true if sustain pedal is down |
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uint8_t PrevHoldCCValue; |
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int Pitch; ///< Current (absolute) MIDI pitch value. |
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|
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void ProcessNoteOn(ModulationSystem::Event* pNoteOnEvent); |
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void ProcessNoteOff(ModulationSystem::Event* pNoteOffEvent); |
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void ProcessPitchbend(ModulationSystem::Event* pPitchbendEvent); |
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void ProcessControlChange(ModulationSystem::Event* pControlChangeEvent); |
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void KillVoice(Voice* pVoice); |
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void CacheInitialSamples(gig::Sample* pSample); |
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|
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friend class Voice; |
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}; |
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|
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#endif // __AUDIOTHREAD_H__ |
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