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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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#include "audiothread.h" |
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|
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AudioThread::AudioThread(AudioIO* pAudioIO, DiskThread* pDiskThread, gig::Instrument* pInstrument) { |
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this->pAudioIO = pAudioIO; |
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this->pDiskThread = pDiskThread; |
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this->pInstrument = pInstrument; |
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this->Pitch = 0; |
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Voice::pDiskThread = pDiskThread; |
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Voice::pEngine = this; |
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pEventQueue = new RingBuffer<ModulationSystem::Event>(MAX_EVENTS_PER_FRAGMENT); |
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pEventPool = new RTELMemoryPool<ModulationSystem::Event>(MAX_EVENTS_PER_FRAGMENT); |
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pVoicePool = new RTELMemoryPool<Voice>(MAX_AUDIO_VOICES); |
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pActiveKeys = new RTELMemoryPool<uint>(128); |
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pEvents = new RTEList<ModulationSystem::Event>(pEventPool); |
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for (uint i = 0; i < ModulationSystem::destination_count; i++) { |
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pCCEvents[i] = new RTEList<ModulationSystem::Event>(pEventPool); |
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} |
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for (uint i = 0; i < 128; i++) { |
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pMIDIKeyInfo[i].pActiveVoices = new RTEList<Voice>(pVoicePool); |
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pMIDIKeyInfo[i].KeyPressed = false; |
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pMIDIKeyInfo[i].Active = false; |
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pMIDIKeyInfo[i].pSelf = NULL; |
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pMIDIKeyInfo[i].pEvents = new RTEList<ModulationSystem::Event>(pEventPool); |
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} |
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|
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// FIXME: assuming stereo output |
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pAudioSumBuffer[0] = new float[pAudioIO->MaxSamplesPerCycle() * pAudioIO->Channels()]; |
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pAudioSumBuffer[1] = &pAudioSumBuffer[0][pAudioIO->MaxSamplesPerCycle()]; |
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|
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// set all voice outputs to the AudioSumBuffer |
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for (Voice* pVoice = pVoicePool->alloc(); pVoice; pVoice = pVoicePool->alloc()) { //FIXME: assuming stereo |
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pVoice->SetOutputLeft(pAudioSumBuffer[0], pAudioIO->MaxSamplesPerCycle()); |
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pVoice->SetOutputRight(pAudioSumBuffer[1], pAudioIO->MaxSamplesPerCycle()); |
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} |
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pVoicePool->clear(); |
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|
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// cache initial samples points (for actually needed samples) |
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dmsg(1,("Caching initial samples...")); |
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gig::Region* pRgn = this->pInstrument->GetFirstRegion(); |
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while (pRgn) { |
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if (!pRgn->GetSample()->GetCache().Size) { |
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dmsg(2,("C")); |
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CacheInitialSamples(pRgn->GetSample()); |
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} |
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for (uint i = 0; i < pRgn->DimensionRegions; i++) { |
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CacheInitialSamples(pRgn->pDimensionRegions[i]->pSample); |
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} |
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|
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pRgn = this->pInstrument->GetNextRegion(); |
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} |
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|
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// initialize modulation system |
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ModulationSystem::Initialize(pAudioIO->SampleRate(), pAudioIO->MaxSamplesPerCycle()); |
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|
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// sustain pedal value |
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PrevHoldCCValue = 0; |
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SustainPedal = 0; |
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|
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dmsg(1,("OK\n")); |
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} |
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|
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AudioThread::~AudioThread() { |
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ModulationSystem::Close(); |
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for (uint i = 0; i < 128; i++) { |
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if (pMIDIKeyInfo[i].pActiveVoices) delete pMIDIKeyInfo[i].pActiveVoices; |
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if (pMIDIKeyInfo[i].pEvents) delete pMIDIKeyInfo[i].pEvents; |
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} |
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for (uint i = 0; i < ModulationSystem::destination_count; i++) { |
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if (pCCEvents[i]) delete pCCEvents[i]; |
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} |
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delete[] pCCEvents; |
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if (pEvents) delete pEvents; |
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if (pEventQueue) delete pEventQueue; |
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if (pEventPool) delete pEventPool; |
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if (pVoicePool) delete pVoicePool; |
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if (pActiveKeys) delete pActiveKeys; |
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delete[] pAudioSumBuffer[0]; // this also frees the right channel buffer |
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} |
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|
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/** |
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* Let this engine proceed to render the given amount of sample points. The |
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* calculated audio data of all voices of this engine will be placed into |
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* the engine's audio sum buffer which has to be copied and eventually be |
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* converted to the appropriate value range by the audio output class (e.g. |
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* AlsaIO or JackIO) right after. |
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* |
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* @param Samples - number of sample points to be rendered |
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* @returns 0 on success |
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*/ |
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int AudioThread::RenderAudio(uint Samples) { |
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|
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// empty the event lists for the new fragment |
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pEvents->clear(); |
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for (uint i = 0; i < ModulationSystem::destination_count; i++) { |
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pCCEvents[i]->clear(); |
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} |
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|
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// read and copy events from input queue |
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ModulationSystem::Event Event; |
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while (true) { |
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if (!pEventQueue->pop(&Event)) break; |
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pEvents->alloc_assign(Event); |
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} |
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|
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|
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// update time of start and end of this audio fragment (as events' time stamps relate to this) |
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ModulationSystem::UpdateFragmentTime(); |
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|
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|
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// process events |
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ModulationSystem::Event* pNextEvent = pEvents->first(); |
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while (pNextEvent) { |
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ModulationSystem::Event* pEvent = pNextEvent; |
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pEvents->set_current(pEvent); |
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pNextEvent = pEvents->next(); |
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switch (pEvent->Type) { |
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case ModulationSystem::event_type_note_on: |
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dmsg(5,("Audio Thread: Note on received\n")); |
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ProcessNoteOn(pEvent); |
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break; |
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case ModulationSystem::event_type_note_off: |
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dmsg(5,("Audio Thread: Note off received\n")); |
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ProcessNoteOff(pEvent); |
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break; |
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case ModulationSystem::event_type_control_change: |
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dmsg(5,("Audio Thread: MIDI CC received\n")); |
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ProcessControlChange(pEvent); |
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break; |
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case ModulationSystem::event_type_pitchbend: |
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dmsg(5,("Audio Thread: Pitchbend received\n")); |
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ProcessPitchbend(pEvent); |
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break; |
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} |
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} |
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|
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|
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// zero out the output sum buffer (left and right channel) |
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memset(pAudioSumBuffer[0], 0, Samples * pAudioIO->Channels() * sizeof(float)); |
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|
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|
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// render audio from all active voices |
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int active_voices = 0; |
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uint* piKey = pActiveKeys->first(); |
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while (piKey) { // iterate through all active keys |
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midi_key_info_t* pKey = &pMIDIKeyInfo[*piKey]; |
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pActiveKeys->set_current(piKey); |
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piKey = pActiveKeys->next(); |
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|
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Voice* pVoiceNext = pKey->pActiveVoices->first(); |
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while (pVoiceNext) { // iterate through all voices on this key |
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// already get next voice on key |
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Voice* pVoice = pVoiceNext; |
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pKey->pActiveVoices->set_current(pVoice); |
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pVoiceNext = pKey->pActiveVoices->next(); |
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|
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// now render current voice |
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pVoice->Render(Samples); |
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if (pVoice->IsActive()) active_voices++; // still active |
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else { // voice reached end, is now inactive |
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KillVoice(pVoice); // remove voice from the list of active voices |
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} |
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} |
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pKey->pEvents->clear(); // free all events on the key |
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} |
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|
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|
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// write that to the disk thread class so that it can print it |
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// on the console for debugging purposes |
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ActiveVoiceCount = active_voices; |
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if (ActiveVoiceCount > ActiveVoiceCountMax) ActiveVoiceCountMax = ActiveVoiceCount; |
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|
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|
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return 0; |
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} |
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|
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/** |
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* Will be called by the MIDIIn Thread to let the audio thread trigger a new |
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* voice for the given key. |
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* |
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* @param Key - MIDI key number of the triggered key |
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* @param Velocity - MIDI velocity value of the triggered key |
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*/ |
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void AudioThread::SendNoteOn(uint8_t Key, uint8_t Velocity) { |
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ModulationSystem::Event Event; |
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Event.Type = ModulationSystem::event_type_note_on; |
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Event.Key = Key; |
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Event.Velocity = Velocity; |
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if (this->pEventQueue->write_space() > 0) this->pEventQueue->push(&Event); |
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else dmsg(1,("AudioThread: Input event queue full!")); |
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} |
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|
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/** |
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* Will be called by the MIDIIn Thread to signal the audio thread to release |
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* voice(s) on the given key. |
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* |
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* @param Key - MIDI key number of the released key |
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* @param Velocity - MIDI release velocity value of the released key |
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*/ |
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void AudioThread::SendNoteOff(uint8_t Key, uint8_t Velocity) { |
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ModulationSystem::Event Event; |
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Event.Type = ModulationSystem::event_type_note_off; |
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Event.Key = Key; |
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Event.Velocity = Velocity; |
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if (this->pEventQueue->write_space() > 0) this->pEventQueue->push(&Event); |
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else dmsg(1,("AudioThread: Input event queue full!")); |
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} |
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|
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/** |
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* Will be called by the MIDIIn Thread to signal the audio thread to change |
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* the pitch value for all voices. |
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* |
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* @param Pitch - MIDI pitch value (-8192 ... +8191) |
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*/ |
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void AudioThread::SendPitchbend(int Pitch) { |
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ModulationSystem::Event Event; |
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Event.Type = ModulationSystem::event_type_pitchbend; |
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Event.Pitch = Pitch; |
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if (this->pEventQueue->write_space() > 0) this->pEventQueue->push(&Event); |
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else dmsg(1,("AudioThread: Input event queue full!")); |
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} |
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|
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/** |
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* Will be called by the MIDIIn Thread to signal the audio thread that a |
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* continuous controller value has changed. |
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* |
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* @param Controller - MIDI controller number of the occured control change |
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* @param Value - value of the control change |
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*/ |
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void AudioThread::SendControlChange(uint8_t Controller, uint8_t Value) { |
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ModulationSystem::Event Event; |
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Event.Type = ModulationSystem::event_type_control_change; |
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Event.Controller = Controller; |
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Event.Value = Value; |
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if (this->pEventQueue->write_space() > 0) this->pEventQueue->push(&Event); |
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else dmsg(1,("AudioThread: Input event queue full!")); |
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} |
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|
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/** |
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* Assigns and triggers a new voice for the respective MIDI key. |
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* |
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* @param pNoteOnEvent - key, velocity and time stamp of the event |
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*/ |
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void AudioThread::ProcessNoteOn(ModulationSystem::Event* pNoteOnEvent) { |
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midi_key_info_t* pKey = &pMIDIKeyInfo[pNoteOnEvent->Key]; |
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|
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pKey->KeyPressed = true; // the MIDI key was now pressed down |
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|
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// cancel release process of voices on this key if needed |
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if (pKey->Active && !SustainPedal) { |
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pNoteOnEvent->Type = ModulationSystem::event_type_cancel_release; // transform event type |
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pEvents->move(pNoteOnEvent, pKey->pEvents); // move event to the key's own event list |
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} |
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|
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// allocate a new voice for the key |
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Voice* pNewVoice = pKey->pActiveVoices->alloc(); |
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if (pNewVoice) { |
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// launch the new voice |
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if (pNewVoice->Trigger(pNoteOnEvent, this->Pitch, this->pInstrument) < 0) { |
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dmsg(1,("Triggering new voice failed!\n")); |
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pKey->pActiveVoices->free(pNewVoice); |
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} |
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else if (!pKey->Active) { // mark as active key |
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pKey->Active = true; |
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pKey->pSelf = pActiveKeys->alloc(); |
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*pKey->pSelf = pNoteOnEvent->Key; |
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} |
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} |
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else std::cerr << "No free voice!" << std::endl << std::flush; |
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} |
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|
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/** |
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* Releases the voices on the given key if sustain pedal is not pressed. |
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* If sustain is pressed, the release of the note will be postponed until |
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* sustain pedal will be released or voice turned inactive by itself (e.g. |
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* due to completion of sample playback). |
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* |
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* @param pNoteOffEvent - key, velocity and time stamp of the event |
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*/ |
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void AudioThread::ProcessNoteOff(ModulationSystem::Event* pNoteOffEvent) { |
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midi_key_info_t* pKey = &pMIDIKeyInfo[pNoteOffEvent->Key]; |
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|
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pKey->KeyPressed = false; // the MIDI key was now released |
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|
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// release voices on this key if needed |
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if (pKey->Active && !SustainPedal) { |
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pNoteOffEvent->Type = ModulationSystem::event_type_release; // transform event type |
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pEvents->move(pNoteOffEvent, pKey->pEvents); // move event to the key's own event list |
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} |
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} |
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|
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/** |
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* Moves pitchbend event from the general (input) event list to the pitch |
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* event list and converts absolute pitch value to delta pitch value. |
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* |
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* @param pPitchbendEvent - absolute pitch value and time stamp of the event |
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*/ |
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void AudioThread::ProcessPitchbend(ModulationSystem::Event* pPitchbendEvent) { |
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int currentPitch = pPitchbendEvent->Pitch; |
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pPitchbendEvent->Pitch -= this->Pitch; // convert to delta |
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this->Pitch = currentPitch; // store current absolute pitch value |
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pEvents->move(pPitchbendEvent, pCCEvents[ModulationSystem::destination_vco]); |
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} |
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|
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/** |
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* Immediately kills the voice given with pVoice (no matter if sustain is |
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* pressed or not) and removes it from the MIDI key's list of active voice. |
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* This method will e.g. be called if a voice went inactive by itself. |
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* |
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* @param pVoice - points to the voice to be killed |
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*/ |
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void AudioThread::KillVoice(Voice* pVoice) { |
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if (pVoice) { |
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if (pVoice->IsActive()) pVoice->Kill(); |
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|
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midi_key_info_t* pKey = &pMIDIKeyInfo[pVoice->MIDIKey]; |
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|
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// free the voice object |
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pVoicePool->free(pVoice); |
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|
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// check if there are no voices left on the MIDI key and update the key info if so |
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if (pKey->pActiveVoices->is_empty()) { |
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pKey->Active = false; |
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pActiveKeys->free(pKey->pSelf); // remove key from list of active keys |
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pKey->pSelf = NULL; |
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dmsg(3,("Key has no more voices now\n")); |
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} |
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} |
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else std::cerr << "Couldn't release voice! (pVoice == NULL)\n" << std::flush; |
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} |
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|
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/** |
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* Reacts on supported control change commands (e.g. pitch bend wheel, |
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* modulation wheel, aftertouch). |
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* |
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* @param pControlChangeEvent - controller, value and time stamp of the event |
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*/ |
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void AudioThread::ProcessControlChange(ModulationSystem::Event* pControlChangeEvent) { |
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dmsg(4,("AudioThread::ContinuousController cc=%d v=%d\n", pControlChangeEvent->Controller, pControlChangeEvent->Value)); |
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|
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switch (pControlChangeEvent->Controller) { |
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case 64: { |
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if (pControlChangeEvent->Value >= 64 && PrevHoldCCValue < 64) { |
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dmsg(4,("PEDAL DOWN\n")); |
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SustainPedal = true; |
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|
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// cancel release process of voices if necessary |
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uint* piKey = pActiveKeys->first(); |
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if (piKey) { |
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pControlChangeEvent->Type = ModulationSystem::event_type_cancel_release; // transform event type |
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while (piKey) { |
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midi_key_info_t* pKey = &pMIDIKeyInfo[*piKey]; |
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pActiveKeys->set_current(piKey); |
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piKey = pActiveKeys->next(); |
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if (!pKey->KeyPressed) { |
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ModulationSystem::Event* pNewEvent = pKey->pEvents->alloc(); |
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if (pNewEvent) *pNewEvent = *pControlChangeEvent; // copy event to the key's own event list |
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else dmsg(1,("Event pool emtpy!\n")); |
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} |
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} |
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pEvents->free(pControlChangeEvent); // free the original event |
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} |
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} |
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if (pControlChangeEvent->Value < 64 && PrevHoldCCValue >= 64) { |
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dmsg(4,("PEDAL UP\n")); |
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SustainPedal = false; |
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|
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// release voices if their respective key is not pressed |
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uint* piKey = pActiveKeys->first(); |
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if (piKey) { |
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pControlChangeEvent->Type = ModulationSystem::event_type_release; // transform event type |
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while (piKey) { |
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midi_key_info_t* pKey = &pMIDIKeyInfo[*piKey]; |
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pActiveKeys->set_current(piKey); |
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piKey = pActiveKeys->next(); |
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if (!pKey->KeyPressed) { |
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ModulationSystem::Event* pNewEvent = pKey->pEvents->alloc(); |
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if (pNewEvent) *pNewEvent = *pControlChangeEvent; // copy event to the key's own event list |
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else dmsg(1,("Event pool emtpy!\n")); |
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} |
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} |
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pEvents->free(pControlChangeEvent); // free the original event |
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} |
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|
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} |
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PrevHoldCCValue = pControlChangeEvent->Value; |
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break; |
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} |
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} |
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} |
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|
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/** |
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* Caches a certain size at the beginning of the given sample in RAM. If the |
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* sample is very short, the whole sample will be loaded into RAM and thus |
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* no disk streaming is needed for this sample. Caching an initial part of |
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* samples is needed to compensate disk reading latency. |
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* |
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* @param pSample - points to the sample to be cached |
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*/ |
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void AudioThread::CacheInitialSamples(gig::Sample* pSample) { |
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if (!pSample || pSample->GetCache().Size) return; |
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if (pSample->SamplesTotal <= NUM_RAM_PRELOAD_SAMPLES) { |
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// Sample is too short for disk streaming, so we load the whole |
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// sample into RAM and place 'pAudioIO->FragmentSize << MAX_PITCH' |
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// number of '0' samples (silence samples) behind the official buffer |
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// border, to allow the interpolator do it's work even at the end of |
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// the sample. |
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gig::buffer_t buf = pSample->LoadSampleDataWithNullSamplesExtension((pAudioIO->MaxSamplesPerCycle() << MAX_PITCH) + 3); |
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dmsg(4,("Cached %d Bytes, %d silence bytes.\n", buf.Size, buf.NullExtensionSize)); |
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} |
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else { // we only cache NUM_RAM_PRELOAD_SAMPLES and stream the other sample points from disk |
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pSample->LoadSampleData(NUM_RAM_PRELOAD_SAMPLES); |
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} |
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|
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if (!pSample->GetCache().Size) std::cerr << "Unable to cache sample - maybe memory full!" << std::endl << std::flush; |
437 |
} |