trunk/src/audiothread.cpp

/***************************************************************************
 *                                                                         *
 *   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                                                   *
 ***************************************************************************/

#include "audiothread.h"

AudioThread::AudioThread(AudioIO* pAudioIO, DiskThread* pDiskThread, gig::Instrument* pInstrument) : Thread(true, 1, 0) {
    this->pAudioIO    = pAudioIO;
    this->pDiskThread = pDiskThread;
    this->pInstrument = pInstrument;
    pCommandQueue     = new RingBuffer<command_t>(1024);
    pVoices           = new Voice*[MAX_AUDIO_VOICES];
    // allocate the ActiveVoicePool (for each midi key there is a variable size linked list
    // of pointers to Voice objects)
    ActiveVoicePool = new RTELMemoryPool<Voice*>(MAX_AUDIO_VOICES);
    for (uint i = 0; i < MAX_AUDIO_VOICES; i++) {
        pVoices[i] = new Voice(pDiskThread);
    }
    for (uint i = 0; i < 128; i++) {
        pMIDIKeyInfo[i].pActiveVoices    = new RTEList<Voice*>;
        pMIDIKeyInfo[i].hSustainPtr      = NULL;
        pMIDIKeyInfo[i].Sustained        = false;
        pMIDIKeyInfo[i].KeyPressed       = false;
        pMIDIKeyInfo[i].pSustainPoolNode = NULL;
    }
    SustainedKeyPool = new RTELMemoryPool<uint>(128);

    pAudioSumBuffer = new float[pAudioIO->FragmentSize * pAudioIO->Channels];

    // set all voice outputs to the AudioSumBuffer
    for (int i = 0; i < MAX_AUDIO_VOICES; i++) {
        pVoices[i]->SetOutput(pAudioSumBuffer, pAudioIO->FragmentSize * 2);  //FIXME: assuming stereo
    }

    // cache initial samples points (for actually needed samples)
    dmsg(1,("Caching initial samples..."));
    gig::Region* pRgn = this->pInstrument->GetFirstRegion();
    while (pRgn) {
        if (!pRgn->GetSample()->GetCache().Size) {
            dmsg(2,("C"));
            CacheInitialSamples(pRgn->GetSample());
        }
        for (uint i = 0; i < pRgn->DimensionRegions; i++) {
            CacheInitialSamples(pRgn->pDimensionRegions[i]->pSample);
        }

        pRgn = this->pInstrument->GetNextRegion();
    }

    // sustain pedal value
    PrevHoldCCValue = 0;
    SustainPedal    = 0;

    dmsg(1,("OK\n"));
}

AudioThread::~AudioThread() {
    if (pCommandQueue) delete pCommandQueue;
    if (pVoices) {
        for (uint i = 0; i < MAX_AUDIO_VOICES; i++) {
            if (pVoices[i]) delete pVoices[i];
        }
    }
    delete[] pVoices;
}

int AudioThread::Main() {
    dmsg(2,("Audio thread running\n"));

    while (true) {

        // read and process commands from the queue
        while (true) {
            command_t command;
            if (!pCommandQueue->pop(&command)) break;

            switch (command.type) {
                case command_type_note_on:
                    dmsg(5,("Audio Thread: Note on received\n"));
                    ProcessNoteOn(command.pitch, command.velocity);
                    break;
                case command_type_note_off:
                    dmsg(5,("Audio Thread: Note off received\n"));
                    ProcessNoteOff(command.pitch, command.velocity);
                    break;
                case command_type_continuous_controller:
                    dmsg(5,("Audio Thread: MIDI CC received\n"));
                    ProcessControlChange(command.channel, command.number, command.value);
                    break;
            }
        }


        // zero out the sum buffer
        for (uint u = 0; u < pAudioIO->FragmentSize * pAudioIO->Channels; u++) {
            pAudioSumBuffer[u] = 0.0;
        }


        // render audio from all active voices
        int active_voices = 0;
        for (uint i = 0; i < MAX_AUDIO_VOICES; i++) {
            if (pVoices[i]->IsActive()) {
                pVoices[i]->RenderAudio();
                if (pVoices[i]->IsActive()) active_voices++; // still active
                else { // voice reached end, is now inactive
                    ReleaseVoice(pVoices[i]); // remove voice from the list of active voices
                }
            }
        }
        // write that to the disk thread class so that it can print it
        // on the console for debugging purposes
        ActiveVoiceCount = active_voices;
        if (ActiveVoiceCount > ActiveVoiceCountMax) ActiveVoiceCountMax = ActiveVoiceCount;


        // check clipping in the audio sum, convert to sample_type
        // (from 32bit to 16bit sample) and copy to output buffer
        float sample_point;
        for (uint u = 0; u < pAudioIO->FragmentSize * pAudioIO->Channels; u++) {
            sample_point = this->pAudioSumBuffer[u] / 4; // FIXME division by 4 just for testing purposes (to give a bit of head room when mixing multiple voices together)
            if (sample_point < -32768.0) sample_point = -32768.0;
            if (sample_point > 32767.0)  sample_point = 32767.0;
            this->pAudioIO->pOutputBuffer[u] = (sample_t) sample_point;
        }


        // call audio driver to output sound
        int res = this->pAudioIO->Output();
        if (res < 0) exit(EXIT_FAILURE);
    }
}

/// Will be called by the MIDIIn Thread to let the audio thread trigger a new voice.
void AudioThread::SendNoteOn(uint8_t Pitch, uint8_t Velocity) {
    command_t cmd;
    cmd.type     = command_type_note_on;
    cmd.pitch    = Pitch;
    cmd.velocity = Velocity;
    if (this->pCommandQueue->write_space() > 0) this->pCommandQueue->push(&cmd);
    else dmsg(1,("AudioThread: Command queue full!"));
}

/// Will be called by the MIDIIn Thread to signal the audio thread to release voice(s).
void AudioThread::SendNoteOff(uint8_t Pitch, uint8_t Velocity) {
    command_t cmd;
    cmd.type     = command_type_note_off;
    cmd.pitch    = Pitch;
    cmd.velocity = Velocity;
    if (this->pCommandQueue->write_space() > 0) this->pCommandQueue->push(&cmd);
    else dmsg(1,("AudioThread: Command queue full!"));
}

// Will be called by the MIDIIn Thread to signal the audio thread that a continuous controller value has changed.
void AudioThread::SendControlChange(uint8_t Channel, uint8_t Number, uint8_t Value) {
    command_t cmd;
    cmd.type     = command_type_continuous_controller;
    cmd.channel  = Channel;
    cmd.number   = Number;
    cmd.value    = Value;
    if (this->pCommandQueue->write_space() > 0) this->pCommandQueue->push(&cmd);
    else dmsg(1,("AudioThread: Command queue full!"));
}

/**
 *  Assigns and triggers a new voice for the respective MIDI key.
 */
void AudioThread::ProcessNoteOn(uint8_t MIDIKey, uint8_t Velocity) {
    pMIDIKeyInfo[MIDIKey].KeyPressed = true; // the MIDI key was currently pressed down
    for (int i = 0; i < MAX_AUDIO_VOICES; i++) {
        if (pVoices[i]->IsActive()) continue; // search for a free voice

        // launch the new voice
        if (pVoices[i]->Trigger(MIDIKey, Velocity, this->pInstrument) < 0) {
            return; // failed to trigger the new voice
        }

        // add (append) a new voice to the corresponding MIDIKey active voices list
        Voice** new_voice_ptr = ActiveVoicePool->alloc_append(pMIDIKeyInfo[MIDIKey].pActiveVoices);
        *new_voice_ptr = pVoices[i];
        pVoices[i]->pSelfPtr = new_voice_ptr; // FIXME: hack to allow fast deallocation

        // update key info
        if (!pMIDIKeyInfo[MIDIKey].hSustainPtr) {
            dmsg(4,("ActivateVoice(uint,uint): hSustainPtr == null, setting release pointer to the last voice on the key...\n"));
            pMIDIKeyInfo[MIDIKey].pActiveVoices->last();
            pMIDIKeyInfo[MIDIKey].hSustainPtr = pMIDIKeyInfo[MIDIKey].pActiveVoices->current();
        }
        return;
    }
    std::cerr << "No free voice!" << std::endl << std::flush;
}

/**
 *  Releases the voices on the given key if sustain pedal is not pressed.
 *  If sustain is pressed, the release of the note will be postponed until
 *  sustain pedal will be released or voice turned inactive by itself (e.g.
 *  due to completion of sample playback).
 */
void AudioThread::ProcessNoteOff(uint8_t MIDIKey, uint8_t Velocity) {
    pMIDIKeyInfo[MIDIKey].KeyPressed = false; // the MIDI key was currently released
    midi_key_info_t* pmidikey = &pMIDIKeyInfo[MIDIKey];
    if (SustainPedal) { // if sustain pedal is pressed postpone the Note-Off
        if (pmidikey->hSustainPtr) {
            // stick the note-off information to the respective voice
            Voice** pVoiceToRelease = pmidikey->pActiveVoices->set_current(pmidikey->hSustainPtr);
            if (pVoiceToRelease) {
                (*pVoiceToRelease)->ReleaseVelocity = Velocity;
                // now increment the sustain pointer
                pmidikey->pActiveVoices->next();
                pmidikey->hSustainPtr = pmidikey->pActiveVoices->current();
                // if the key was not sustained yet, add it's MIDI key number to the sustained key pool
                if (!pmidikey->Sustained) {
                    uint* sustainedmidikey     = SustainedKeyPool->alloc();
                    *sustainedmidikey          = MIDIKey;
                    pmidikey->pSustainPoolNode = sustainedmidikey;
                    pmidikey->Sustained        = true;
                }
            }
            else dmsg(3,("Ignoring NOTE OFF --> pVoiceToRelease == null!\n"));
        }
        else dmsg(3,("Ignoring NOTE OFF, seems like more Note-Offs than Note-Ons or no free voices available?\n"));
    }
    else {
        // release all active voices on the midi key
        Voice** pVoicePtr = pmidikey->pActiveVoices->first();
        while (pVoicePtr) {
            Voice** pVoicePtrNext = pMIDIKeyInfo[MIDIKey].pActiveVoices->next();
            ReleaseVoice(*pVoicePtr);
            pVoicePtr = pVoicePtrNext;
        }
    }
}

/**
 *  Releases the voice given with pVoice (no matter if sustain is pressed or
 *  not). This method will e.g. be directly called if a voice went inactive
 *  by itself. If sustain pedal is pressed the method takes care to free
 *  those sustain informations of the voice.
 */
void AudioThread::ReleaseVoice(Voice* pVoice) {
    if (pVoice) {
        if (pVoice->IsActive()) pVoice->Kill(); //TODO: for now we're rude and just kill the poor, poor voice immediately :), later we add a Release() method to the Voice class and call it here to let the voice go through it's release phase

        if (pMIDIKeyInfo[pVoice->MIDIKey].Sustained) {
            // check if the sustain pointer has to be moved, now that we release the voice
            RTEList<Voice*>::NodeHandle hSustainPtr = pMIDIKeyInfo[pVoice->MIDIKey].hSustainPtr;
            if (hSustainPtr) {
                Voice** pVoicePtr = pMIDIKeyInfo[pVoice->MIDIKey].pActiveVoices->set_current(hSustainPtr);
                if (pVoicePtr) {
                    if (*pVoicePtr == pVoice) { // move sustain pointer to the next sustained voice
                        dmsg(3,("Correcting sustain pointer\n"));
                        pMIDIKeyInfo[pVoice->MIDIKey].pActiveVoices->next();
                        pMIDIKeyInfo[pVoice->MIDIKey].hSustainPtr = pMIDIKeyInfo[pVoice->MIDIKey].pActiveVoices->current();
                    }
                    else dmsg(4,("ReleaseVoice(Voice*): *hSustain != pVoice\n"));
                }
                else dmsg(3,("ReleaseVoice(Voice*): pVoicePtr == null\n"));
            }
            else dmsg(3,("ReleaseVoice(Voice*): hSustainPtr == null\n"));
        }

        // remove the voice from the list associated with this MIDI key
        ActiveVoicePool->free(pVoice->pSelfPtr);

        // check if there are no voices left on the MIDI key and update the key info if so
        if (pMIDIKeyInfo[pVoice->MIDIKey].pActiveVoices->is_empty()) {
            pMIDIKeyInfo[pVoice->MIDIKey].hSustainPtr = NULL;
            if (pMIDIKeyInfo[pVoice->MIDIKey].Sustained) {
                SustainedKeyPool->free(pMIDIKeyInfo[pVoice->MIDIKey].pSustainPoolNode);
                pMIDIKeyInfo[pVoice->MIDIKey].pSustainPoolNode = NULL;
                pMIDIKeyInfo[pVoice->MIDIKey].Sustained        = false;
            }
            dmsg(3,("Key has no more voices now\n"));
        }
    }
    else std::cerr << "Couldn't release voice! (pVoice == NULL)\n" << std::flush;
}

void AudioThread::ProcessControlChange(uint8_t Channel, uint8_t Number, uint8_t Value) {
    dmsg(4,("AudioThread::ContinuousController c=%d n=%d v=%d\n", Channel, Number, Value));
    if (Number == 64) {
        if (Value >= 64 && PrevHoldCCValue < 64) {
            dmsg(4,("PEDAL DOWN\n"));
            SustainPedal = true;
        }
        if (Value < 64 && PrevHoldCCValue >= 64) {
            dmsg(4,("PEDAL UP\n"));
            SustainPedal = false;
            // iterate through all keys that are currently sustained
            for (uint* key = SustainedKeyPool->first(); key; key = SustainedKeyPool->next()) {
                if (!pMIDIKeyInfo[*key].KeyPressed) { // release the voices on the key, if the key is not pressed anymore
                    // release all active voices on the midi key
                    Voice** pVoicePtr = pMIDIKeyInfo[*key].pActiveVoices->first();
                    while (pVoicePtr) {
                        Voice** pVoicePtrNext = pMIDIKeyInfo[*key].pActiveVoices->next();
                        dmsg(3,("Sustain CC: releasing voice on midi key %d\n", *key));
                        ReleaseVoice(*pVoicePtr);
                        pVoicePtr = pVoicePtrNext;
                    }
                }
            }
        }
        PrevHoldCCValue = Value;
    }
}

void AudioThread::CacheInitialSamples(gig::Sample* pSample) {
    if (!pSample || pSample->GetCache().Size) return;
    if (pSample->SamplesTotal <= NUM_RAM_PRELOAD_SAMPLES) {
        // Sample is too short for disk streaming, so we load the whole
        // sample into RAM and place 'pAudioIO->FragmentSize << MAX_PITCH'
        // number of '0' samples (silence samples) behind the official buffer
        // border, to allow the interpolator do it's work even at the end of
        // the sample.
        gig::buffer_t buf = pSample->LoadSampleDataWithNullSamplesExtension((pAudioIO->FragmentSize << MAX_PITCH) + 3);
        dmsg(4,("Cached %d Bytes, %d silence bytes.\n", buf.Size, buf.NullExtensionSize));
    }
    else { // we only cache NUM_RAM_PRELOAD_SAMPLES and stream the other sample points from disk
        pSample->LoadSampleData(NUM_RAM_PRELOAD_SAMPLES);
    }

    if (!pSample->GetCache().Size) std::cerr << "Unable to cache sample - maybe memory full!" << std::endl << std::flush;
}
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			#include "audiothread.h"
24
25			AudioThread::AudioThread(AudioIO* pAudioIO, DiskThread* pDiskThread, gig::Instrument* pInstrument) : Thread(true, 1, 0) {
26			this->pAudioIO = pAudioIO;
27			this->pDiskThread = pDiskThread;
28			this->pInstrument = pInstrument;
29			pCommandQueue = new RingBuffer<command_t>(1024);
30			pVoices = new Voice*[MAX_AUDIO_VOICES];
31	senoner	10	// allocate the ActiveVoicePool (for each midi key there is a variable size linked list
32	schoenebeck	12	// of pointers to Voice objects)
33			ActiveVoicePool = new RTELMemoryPool<Voice*>(MAX_AUDIO_VOICES);
34	schoenebeck	9	for (uint i = 0; i < MAX_AUDIO_VOICES; i++) {
35			pVoices[i] = new Voice(pDiskThread);
36			}
37			for (uint i = 0; i < 128; i++) {
38	schoenebeck	18	pMIDIKeyInfo[i].pActiveVoices = new RTEList<Voice*>;
39			pMIDIKeyInfo[i].hSustainPtr = NULL;
40			pMIDIKeyInfo[i].Sustained = false;
41			pMIDIKeyInfo[i].KeyPressed = false;
42			pMIDIKeyInfo[i].pSustainPoolNode = NULL;
43	schoenebeck	9	}
44	schoenebeck	15	SustainedKeyPool = new RTELMemoryPool<uint>(128);
45	schoenebeck	9
46			pAudioSumBuffer = new float[pAudioIO->FragmentSize * pAudioIO->Channels];
47
48			// set all voice outputs to the AudioSumBuffer
49			for (int i = 0; i < MAX_AUDIO_VOICES; i++) {
50			pVoices[i]->SetOutput(pAudioSumBuffer, pAudioIO->FragmentSize * 2); //FIXME: assuming stereo
51			}
52
53			// cache initial samples points (for actually needed samples)
54	schoenebeck	12	dmsg(1,("Caching initial samples..."));
55	schoenebeck	9	gig::Region* pRgn = this->pInstrument->GetFirstRegion();
56			while (pRgn) {
57			if (!pRgn->GetSample()->GetCache().Size) {
58	schoenebeck	12	dmsg(2,("C"));
59	schoenebeck	9	CacheInitialSamples(pRgn->GetSample());
60			}
61			for (uint i = 0; i < pRgn->DimensionRegions; i++) {
62			CacheInitialSamples(pRgn->pDimensionRegions[i]->pSample);
63			}
64
65			pRgn = this->pInstrument->GetNextRegion();
66			}
67	senoner	10
68			// sustain pedal value
69	schoenebeck	12	PrevHoldCCValue = 0;
70			SustainPedal = 0;
71	senoner	10
72	schoenebeck	12	dmsg(1,("OK\n"));
73	schoenebeck	9	}
74
75			AudioThread::~AudioThread() {
76			if (pCommandQueue) delete pCommandQueue;
77			if (pVoices) {
78			for (uint i = 0; i < MAX_AUDIO_VOICES; i++) {
79			if (pVoices[i]) delete pVoices[i];
80			}
81			}
82			delete[] pVoices;
83			}
84
85			int AudioThread::Main() {
86	schoenebeck	12	dmsg(2,("Audio thread running\n"));
87	schoenebeck	9
88			while (true) {
89
90			// read and process commands from the queue
91			while (true) {
92			command_t command;
93	schoenebeck	18	if (!pCommandQueue->pop(&command)) break;
94	schoenebeck	9
95			switch (command.type) {
96			case command_type_note_on:
97	schoenebeck	12	dmsg(5,("Audio Thread: Note on received\n"));
98	schoenebeck	18	ProcessNoteOn(command.pitch, command.velocity);
99	schoenebeck	9	break;
100			case command_type_note_off:
101	schoenebeck	12	dmsg(5,("Audio Thread: Note off received\n"));
102	schoenebeck	18	ProcessNoteOff(command.pitch, command.velocity);
103	schoenebeck	9	break;
104	senoner	10	case command_type_continuous_controller:
105	schoenebeck	12	dmsg(5,("Audio Thread: MIDI CC received\n"));
106	schoenebeck	18	ProcessControlChange(command.channel, command.number, command.value);
107	senoner	10	break;
108	schoenebeck	9	}
109			}
110
111
112			// zero out the sum buffer
113			for (uint u = 0; u < pAudioIO->FragmentSize * pAudioIO->Channels; u++) {
114			pAudioSumBuffer[u] = 0.0;
115			}
116
117
118			// render audio from all active voices
119	schoenebeck	12	int active_voices = 0;
120	schoenebeck	9	for (uint i = 0; i < MAX_AUDIO_VOICES; i++) {
121			if (pVoices[i]->IsActive()) {
122			pVoices[i]->RenderAudio();
123	schoenebeck	12	if (pVoices[i]->IsActive()) active_voices++; // still active
124			else { // voice reached end, is now inactive
125			ReleaseVoice(pVoices[i]); // remove voice from the list of active voices
126			}
127	schoenebeck	9	}
128			}
129	schoenebeck	12	// write that to the disk thread class so that it can print it
130	senoner	10	// on the console for debugging purposes
131	schoenebeck	12	ActiveVoiceCount = active_voices;
132	schoenebeck	13	if (ActiveVoiceCount > ActiveVoiceCountMax) ActiveVoiceCountMax = ActiveVoiceCount;
133	schoenebeck	9
134
135			// check clipping in the audio sum, convert to sample_type
136			// (from 32bit to 16bit sample) and copy to output buffer
137			float sample_point;
138			for (uint u = 0; u < pAudioIO->FragmentSize * pAudioIO->Channels; u++) {
139			sample_point = this->pAudioSumBuffer[u] / 4; // FIXME division by 4 just for testing purposes (to give a bit of head room when mixing multiple voices together)
140			if (sample_point < -32768.0) sample_point = -32768.0;
141			if (sample_point > 32767.0) sample_point = 32767.0;
142			this->pAudioIO->pOutputBuffer[u] = (sample_t) sample_point;
143			}
144
145
146			// call audio driver to output sound
147			int res = this->pAudioIO->Output();
148			if (res < 0) exit(EXIT_FAILURE);
149			}
150			}
151
152			/// Will be called by the MIDIIn Thread to let the audio thread trigger a new voice.
153	schoenebeck	18	void AudioThread::SendNoteOn(uint8_t Pitch, uint8_t Velocity) {
154	schoenebeck	9	command_t cmd;
155			cmd.type = command_type_note_on;
156			cmd.pitch = Pitch;
157			cmd.velocity = Velocity;
158	schoenebeck	18	if (this->pCommandQueue->write_space() > 0) this->pCommandQueue->push(&cmd);
159			else dmsg(1,("AudioThread: Command queue full!"));
160	schoenebeck	9	}
161
162	schoenebeck	18	/// Will be called by the MIDIIn Thread to signal the audio thread to release voice(s).
163			void AudioThread::SendNoteOff(uint8_t Pitch, uint8_t Velocity) {
164	schoenebeck	9	command_t cmd;
165			cmd.type = command_type_note_off;
166			cmd.pitch = Pitch;
167			cmd.velocity = Velocity;
168	schoenebeck	18	if (this->pCommandQueue->write_space() > 0) this->pCommandQueue->push(&cmd);
169			else dmsg(1,("AudioThread: Command queue full!"));
170	schoenebeck	9	}
171
172	schoenebeck	18	// Will be called by the MIDIIn Thread to signal the audio thread that a continuous controller value has changed.
173			void AudioThread::SendControlChange(uint8_t Channel, uint8_t Number, uint8_t Value) {
174	senoner	10	command_t cmd;
175			cmd.type = command_type_continuous_controller;
176			cmd.channel = Channel;
177			cmd.number = Number;
178			cmd.value = Value;
179	schoenebeck	18	if (this->pCommandQueue->write_space() > 0) this->pCommandQueue->push(&cmd);
180			else dmsg(1,("AudioThread: Command queue full!"));
181	senoner	10	}
182
183	schoenebeck	18	/**
184			* Assigns and triggers a new voice for the respective MIDI key.
185			*/
186			void AudioThread::ProcessNoteOn(uint8_t MIDIKey, uint8_t Velocity) {
187			pMIDIKeyInfo[MIDIKey].KeyPressed = true; // the MIDI key was currently pressed down
188	schoenebeck	9	for (int i = 0; i < MAX_AUDIO_VOICES; i++) {
189	schoenebeck	18	if (pVoices[i]->IsActive()) continue; // search for a free voice
190	schoenebeck	15
191	schoenebeck	18	// launch the new voice
192			if (pVoices[i]->Trigger(MIDIKey, Velocity, this->pInstrument) < 0) {
193			return; // failed to trigger the new voice
194			}
195
196	senoner	10	// add (append) a new voice to the corresponding MIDIKey active voices list
197	schoenebeck	15	Voice** new_voice_ptr = ActiveVoicePool->alloc_append(pMIDIKeyInfo[MIDIKey].pActiveVoices);
198	schoenebeck	12	*new_voice_ptr = pVoices[i];
199			pVoices[i]->pSelfPtr = new_voice_ptr; // FIXME: hack to allow fast deallocation
200	schoenebeck	15
201	schoenebeck	18	// update key info
202	schoenebeck	15	if (!pMIDIKeyInfo[MIDIKey].hSustainPtr) {
203			dmsg(4,("ActivateVoice(uint,uint): hSustainPtr == null, setting release pointer to the last voice on the key...\n"));
204			pMIDIKeyInfo[MIDIKey].pActiveVoices->last();
205			pMIDIKeyInfo[MIDIKey].hSustainPtr = pMIDIKeyInfo[MIDIKey].pActiveVoices->current();
206			}
207	schoenebeck	9	return;
208			}
209			std::cerr << "No free voice!" << std::endl << std::flush;
210			}
211
212	schoenebeck	15	/**
213			* Releases the voices on the given key if sustain pedal is not pressed.
214			* If sustain is pressed, the release of the note will be postponed until
215			* sustain pedal will be released or voice turned inactive by itself (e.g.
216			* due to completion of sample playback).
217			*/
218	schoenebeck	18	void AudioThread::ProcessNoteOff(uint8_t MIDIKey, uint8_t Velocity) {
219			pMIDIKeyInfo[MIDIKey].KeyPressed = false; // the MIDI key was currently released
220	schoenebeck	15	midi_key_info_t* pmidikey = &pMIDIKeyInfo[MIDIKey];
221			if (SustainPedal) { // if sustain pedal is pressed postpone the Note-Off
222			if (pmidikey->hSustainPtr) {
223			// stick the note-off information to the respective voice
224			Voice** pVoiceToRelease = pmidikey->pActiveVoices->set_current(pmidikey->hSustainPtr);
225			if (pVoiceToRelease) {
226			(*pVoiceToRelease)->ReleaseVelocity = Velocity;
227			// now increment the sustain pointer
228			pmidikey->pActiveVoices->next();
229			pmidikey->hSustainPtr = pmidikey->pActiveVoices->current();
230			// if the key was not sustained yet, add it's MIDI key number to the sustained key pool
231			if (!pmidikey->Sustained) {
232	schoenebeck	18	uint* sustainedmidikey = SustainedKeyPool->alloc();
233			*sustainedmidikey = MIDIKey;
234			pmidikey->pSustainPoolNode = sustainedmidikey;
235			pmidikey->Sustained = true;
236	schoenebeck	15	}
237			}
238			else dmsg(3,("Ignoring NOTE OFF --> pVoiceToRelease == null!\n"));
239			}
240			else dmsg(3,("Ignoring NOTE OFF, seems like more Note-Offs than Note-Ons or no free voices available?\n"));
241	schoenebeck	12	}
242			else {
243	schoenebeck	18	// release all active voices on the midi key
244	schoenebeck	15	Voice** pVoicePtr = pmidikey->pActiveVoices->first();
245	schoenebeck	18	while (pVoicePtr) {
246			Voice** pVoicePtrNext = pMIDIKeyInfo[MIDIKey].pActiveVoices->next();
247			ReleaseVoice(*pVoicePtr);
248			pVoicePtr = pVoicePtrNext;
249			}
250	schoenebeck	12	}
251			}
252	senoner	10
253	schoenebeck	15	/**
254			* Releases the voice given with pVoice (no matter if sustain is pressed or
255			* not). This method will e.g. be directly called if a voice went inactive
256	schoenebeck	18	* by itself. If sustain pedal is pressed the method takes care to free
257	schoenebeck	15	* those sustain informations of the voice.
258			*/
259	schoenebeck	12	void AudioThread::ReleaseVoice(Voice* pVoice) {
260	schoenebeck	9	if (pVoice) {
261	schoenebeck	12	if (pVoice->IsActive()) pVoice->Kill(); //TODO: for now we're rude and just kill the poor, poor voice immediately :), later we add a Release() method to the Voice class and call it here to let the voice go through it's release phase
262	senoner	10
263	schoenebeck	15	if (pMIDIKeyInfo[pVoice->MIDIKey].Sustained) {
264			// check if the sustain pointer has to be moved, now that we release the voice
265			RTEList<Voice*>::NodeHandle hSustainPtr = pMIDIKeyInfo[pVoice->MIDIKey].hSustainPtr;
266			if (hSustainPtr) {
267			Voice** pVoicePtr = pMIDIKeyInfo[pVoice->MIDIKey].pActiveVoices->set_current(hSustainPtr);
268			if (pVoicePtr) {
269			if (*pVoicePtr == pVoice) { // move sustain pointer to the next sustained voice
270			dmsg(3,("Correcting sustain pointer\n"));
271			pMIDIKeyInfo[pVoice->MIDIKey].pActiveVoices->next();
272			pMIDIKeyInfo[pVoice->MIDIKey].hSustainPtr = pMIDIKeyInfo[pVoice->MIDIKey].pActiveVoices->current();
273			}
274			else dmsg(4,("ReleaseVoice(Voice): hSustain != pVoice\n"));
275			}
276			else dmsg(3,("ReleaseVoice(Voice*): pVoicePtr == null\n"));
277			}
278			else dmsg(3,("ReleaseVoice(Voice*): hSustainPtr == null\n"));
279	schoenebeck	18	}
280	schoenebeck	15
281	schoenebeck	18	// remove the voice from the list associated with this MIDI key
282			ActiveVoicePool->free(pVoice->pSelfPtr);
283	schoenebeck	15
284	schoenebeck	18	// check if there are no voices left on the MIDI key and update the key info if so
285			if (pMIDIKeyInfo[pVoice->MIDIKey].pActiveVoices->is_empty()) {
286			pMIDIKeyInfo[pVoice->MIDIKey].hSustainPtr = NULL;
287			if (pMIDIKeyInfo[pVoice->MIDIKey].Sustained) {
288			SustainedKeyPool->free(pMIDIKeyInfo[pVoice->MIDIKey].pSustainPoolNode);
289			pMIDIKeyInfo[pVoice->MIDIKey].pSustainPoolNode = NULL;
290			pMIDIKeyInfo[pVoice->MIDIKey].Sustained = false;
291	schoenebeck	15	}
292	schoenebeck	18	dmsg(3,("Key has no more voices now\n"));
293	schoenebeck	15	}
294	schoenebeck	9	}
295	schoenebeck	15	else std::cerr << "Couldn't release voice! (pVoice == NULL)\n" << std::flush;
296	schoenebeck	9	}
297
298	schoenebeck	18	void AudioThread::ProcessControlChange(uint8_t Channel, uint8_t Number, uint8_t Value) {
299	schoenebeck	12	dmsg(4,("AudioThread::ContinuousController c=%d n=%d v=%d\n", Channel, Number, Value));
300			if (Number == 64) {
301			if (Value >= 64 && PrevHoldCCValue < 64) {
302			dmsg(4,("PEDAL DOWN\n"));
303			SustainPedal = true;
304			}
305			if (Value < 64 && PrevHoldCCValue >= 64) {
306			dmsg(4,("PEDAL UP\n"));
307			SustainPedal = false;
308	schoenebeck	15	// iterate through all keys that are currently sustained
309			for (uint* key = SustainedKeyPool->first(); key; key = SustainedKeyPool->next()) {
310	schoenebeck	18	if (!pMIDIKeyInfo[*key].KeyPressed) { // release the voices on the key, if the key is not pressed anymore
311			// release all active voices on the midi key
312			Voice** pVoicePtr = pMIDIKeyInfo[*key].pActiveVoices->first();
313			while (pVoicePtr) {
314			Voice** pVoicePtrNext = pMIDIKeyInfo[*key].pActiveVoices->next();
315			dmsg(3,("Sustain CC: releasing voice on midi key %d\n", *key));
316			ReleaseVoice(*pVoicePtr);
317			pVoicePtr = pVoicePtrNext;
318			}
319	schoenebeck	15	}
320	schoenebeck	12	}
321			}
322			PrevHoldCCValue = Value;
323	senoner	10	}
324			}
325
326	schoenebeck	9	void AudioThread::CacheInitialSamples(gig::Sample* pSample) {
327			if (!pSample \|\| pSample->GetCache().Size) return;
328			if (pSample->SamplesTotal <= NUM_RAM_PRELOAD_SAMPLES) {
329			// Sample is too short for disk streaming, so we load the whole
330			// sample into RAM and place 'pAudioIO->FragmentSize << MAX_PITCH'
331			// number of '0' samples (silence samples) behind the official buffer
332			// border, to allow the interpolator do it's work even at the end of
333			// the sample.
334	schoenebeck	18	gig::buffer_t buf = pSample->LoadSampleDataWithNullSamplesExtension((pAudioIO->FragmentSize << MAX_PITCH) + 3);
335	schoenebeck	12	dmsg(4,("Cached %d Bytes, %d silence bytes.\n", buf.Size, buf.NullExtensionSize));
336	schoenebeck	9	}
337			else { // we only cache NUM_RAM_PRELOAD_SAMPLES and stream the other sample points from disk
338			pSample->LoadSampleData(NUM_RAM_PRELOAD_SAMPLES);
339			}
340
341			if (!pSample->GetCache().Size) std::cerr << "Unable to cache sample - maybe memory full!" << std::endl << std::flush;
342			}