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();
    }

    // initialize modulation system
    ModulationSystem::Initialize(pAudioIO->Samplerate, pAudioIO->FragmentSize);

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

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

AudioThread::~AudioThread() {
    ModulationSystem::Close();
    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 output sum buffer
        memset(pAudioSumBuffer, 0, pAudioIO->FragmentSize * pAudioIO->Channels * sizeof(float));


        // 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
                    KillVoice(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] * this->Volume;
            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();
            (*pVoicePtr)->Release();
            pVoicePtr = pVoicePtrNext;
        }
    }
}

/**
 *  Immediately kills the voice given with pVoice (no matter if sustain is
 *  pressed or not) and removes it from the MIDI key's list of active voice.
 *  This method will e.g. be 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::KillVoice(Voice* pVoice) {
    if (pVoice) {
        if (pVoice->IsActive()) pVoice->Kill();

        if (pMIDIKeyInfo[pVoice->MIDIKey].Sustained) {
            // check if the sustain pointer has to be moved, now that we kill 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));
                        (*pVoicePtr)->Release();
                        pVoicePtr = pVoicePtrNext;
                    }
                }
                SustainedKeyPool->free(pMIDIKeyInfo[*key].pSustainPoolNode);
                pMIDIKeyInfo[*key].pSustainPoolNode = NULL;
                pMIDIKeyInfo[*key].Sustained   = false;
                pMIDIKeyInfo[*key].hSustainPtr = NULL;
            }
            //SustainedKeyPool->empty();
        }
        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	/***************************************************************************
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	// allocate the ActiveVoicePool (for each midi key there is a variable size linked list
32	// of pointers to Voice objects)
33	ActiveVoicePool = new RTELMemoryPool<Voice*>(MAX_AUDIO_VOICES);
34	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	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	}
44	SustainedKeyPool = new RTELMemoryPool<uint>(128);
45
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	dmsg(1,("Caching initial samples..."));
55	gig::Region* pRgn = this->pInstrument->GetFirstRegion();
56	while (pRgn) {
57	if (!pRgn->GetSample()->GetCache().Size) {
58	dmsg(2,("C"));
59	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
68	// initialize modulation system
69	ModulationSystem::Initialize(pAudioIO->Samplerate, pAudioIO->FragmentSize);
70
71	// sustain pedal value
72	PrevHoldCCValue = 0;
73	SustainPedal = 0;
74
75	dmsg(1,("OK\n"));
76	}
77
78	AudioThread::~AudioThread() {
79	ModulationSystem::Close();
80	if (pCommandQueue) delete pCommandQueue;
81	if (pVoices) {
82	for (uint i = 0; i < MAX_AUDIO_VOICES; i++) {
83	if (pVoices[i]) delete pVoices[i];
84	}
85	}
86	delete[] pVoices;
87	}
88
89	int AudioThread::Main() {
90	dmsg(2,("Audio thread running\n"));
91
92	while (true) {
93
94	// read and process commands from the queue
95	while (true) {
96	command_t command;
97	if (!pCommandQueue->pop(&command)) break;
98
99	switch (command.type) {
100	case command_type_note_on:
101	dmsg(5,("Audio Thread: Note on received\n"));
102	ProcessNoteOn(command.pitch, command.velocity);
103	break;
104	case command_type_note_off:
105	dmsg(5,("Audio Thread: Note off received\n"));
106	ProcessNoteOff(command.pitch, command.velocity);
107	break;
108	case command_type_continuous_controller:
109	dmsg(5,("Audio Thread: MIDI CC received\n"));
110	ProcessControlChange(command.channel, command.number, command.value);
111	break;
112	}
113	}
114
115
116	// zero out the output sum buffer
117	memset(pAudioSumBuffer, 0, pAudioIO->FragmentSize * pAudioIO->Channels * sizeof(float));
118
119
120	// render audio from all active voices
121	int active_voices = 0;
122	for (uint i = 0; i < MAX_AUDIO_VOICES; i++) {
123	if (pVoices[i]->IsActive()) {
124	pVoices[i]->RenderAudio();
125	if (pVoices[i]->IsActive()) active_voices++; // still active
126	else { // voice reached end, is now inactive
127	KillVoice(pVoices[i]); // remove voice from the list of active voices
128	}
129	}
130	}
131	// write that to the disk thread class so that it can print it
132	// on the console for debugging purposes
133	ActiveVoiceCount = active_voices;
134	if (ActiveVoiceCount > ActiveVoiceCountMax) ActiveVoiceCountMax = ActiveVoiceCount;
135
136
137	// check clipping in the audio sum, convert to sample_type
138	// (from 32bit to 16bit sample) and copy to output buffer
139	float sample_point;
140	for (uint u = 0; u < pAudioIO->FragmentSize * pAudioIO->Channels; u++) {
141	sample_point = this->pAudioSumBuffer[u] * this->Volume;
142	if (sample_point < -32768.0) sample_point = -32768.0;
143	if (sample_point > 32767.0) sample_point = 32767.0;
144	this->pAudioIO->pOutputBuffer[u] = (sample_t) sample_point;
145	}
146
147
148	// call audio driver to output sound
149	int res = this->pAudioIO->Output();
150	if (res < 0) exit(EXIT_FAILURE);
151	}
152	}
153
154	/// Will be called by the MIDIIn Thread to let the audio thread trigger a new voice.
155	void AudioThread::SendNoteOn(uint8_t Pitch, uint8_t Velocity) {
156	command_t cmd;
157	cmd.type = command_type_note_on;
158	cmd.pitch = Pitch;
159	cmd.velocity = Velocity;
160	if (this->pCommandQueue->write_space() > 0) this->pCommandQueue->push(&cmd);
161	else dmsg(1,("AudioThread: Command queue full!"));
162	}
163
164	/// Will be called by the MIDIIn Thread to signal the audio thread to release voice(s).
165	void AudioThread::SendNoteOff(uint8_t Pitch, uint8_t Velocity) {
166	command_t cmd;
167	cmd.type = command_type_note_off;
168	cmd.pitch = Pitch;
169	cmd.velocity = Velocity;
170	if (this->pCommandQueue->write_space() > 0) this->pCommandQueue->push(&cmd);
171	else dmsg(1,("AudioThread: Command queue full!"));
172	}
173
174	// Will be called by the MIDIIn Thread to signal the audio thread that a continuous controller value has changed.
175	void AudioThread::SendControlChange(uint8_t Channel, uint8_t Number, uint8_t Value) {
176	command_t cmd;
177	cmd.type = command_type_continuous_controller;
178	cmd.channel = Channel;
179	cmd.number = Number;
180	cmd.value = Value;
181	if (this->pCommandQueue->write_space() > 0) this->pCommandQueue->push(&cmd);
182	else dmsg(1,("AudioThread: Command queue full!"));
183	}
184
185	/**
186	* Assigns and triggers a new voice for the respective MIDI key.
187	*/
188	void AudioThread::ProcessNoteOn(uint8_t MIDIKey, uint8_t Velocity) {
189	pMIDIKeyInfo[MIDIKey].KeyPressed = true; // the MIDI key was currently pressed down
190	for (int i = 0; i < MAX_AUDIO_VOICES; i++) {
191	if (pVoices[i]->IsActive()) continue; // search for a free voice
192
193	// launch the new voice
194	if (pVoices[i]->Trigger(MIDIKey, Velocity, this->pInstrument) < 0) {
195	return; // failed to trigger the new voice
196	}
197
198	// add (append) a new voice to the corresponding MIDIKey active voices list
199	Voice** new_voice_ptr = ActiveVoicePool->alloc_append(pMIDIKeyInfo[MIDIKey].pActiveVoices);
200	*new_voice_ptr = pVoices[i];
201	pVoices[i]->pSelfPtr = new_voice_ptr; // FIXME: hack to allow fast deallocation
202
203	// update key info
204	if (!pMIDIKeyInfo[MIDIKey].hSustainPtr) {
205	dmsg(4,("ActivateVoice(uint,uint): hSustainPtr == null, setting release pointer to the last voice on the key...\n"));
206	pMIDIKeyInfo[MIDIKey].pActiveVoices->last();
207	pMIDIKeyInfo[MIDIKey].hSustainPtr = pMIDIKeyInfo[MIDIKey].pActiveVoices->current();
208	}
209	return;
210	}
211	std::cerr << "No free voice!" << std::endl << std::flush;
212	}
213
214	/**
215	* Releases the voices on the given key if sustain pedal is not pressed.
216	* If sustain is pressed, the release of the note will be postponed until
217	* sustain pedal will be released or voice turned inactive by itself (e.g.
218	* due to completion of sample playback).
219	*/
220	void AudioThread::ProcessNoteOff(uint8_t MIDIKey, uint8_t Velocity) {
221	pMIDIKeyInfo[MIDIKey].KeyPressed = false; // the MIDI key was currently released
222	midi_key_info_t* pmidikey = &pMIDIKeyInfo[MIDIKey];
223	if (SustainPedal) { // if sustain pedal is pressed postpone the Note-Off
224	if (pmidikey->hSustainPtr) {
225	// stick the note-off information to the respective voice
226	Voice** pVoiceToRelease = pmidikey->pActiveVoices->set_current(pmidikey->hSustainPtr);
227	if (pVoiceToRelease) {
228	(*pVoiceToRelease)->ReleaseVelocity = Velocity;
229	// now increment the sustain pointer
230	pmidikey->pActiveVoices->next();
231	pmidikey->hSustainPtr = pmidikey->pActiveVoices->current();
232	// if the key was not sustained yet, add it's MIDI key number to the sustained key pool
233	if (!pmidikey->Sustained) {
234	uint* sustainedmidikey = SustainedKeyPool->alloc();
235	*sustainedmidikey = MIDIKey;
236	pmidikey->pSustainPoolNode = sustainedmidikey;
237	pmidikey->Sustained = true;
238	}
239	}
240	else dmsg(3,("Ignoring NOTE OFF --> pVoiceToRelease == null!\n"));
241	}
242	else dmsg(3,("Ignoring NOTE OFF, seems like more Note-Offs than Note-Ons or no free voices available?\n"));
243	}
244	else {
245	// release all active voices on the midi key
246	Voice** pVoicePtr = pmidikey->pActiveVoices->first();
247	while (pVoicePtr) {
248	Voice** pVoicePtrNext = pMIDIKeyInfo[MIDIKey].pActiveVoices->next();
249	(*pVoicePtr)->Release();
250	pVoicePtr = pVoicePtrNext;
251	}
252	}
253	}
254
255	/**
256	* Immediately kills the voice given with pVoice (no matter if sustain is
257	* pressed or not) and removes it from the MIDI key's list of active voice.
258	* This method will e.g. be called if a voice went inactive by itself. If
259	* sustain pedal is pressed the method takes care to free those sustain
260	* informations of the voice.
261	*/
262	void AudioThread::KillVoice(Voice* pVoice) {
263	if (pVoice) {
264	if (pVoice->IsActive()) pVoice->Kill();
265
266	if (pMIDIKeyInfo[pVoice->MIDIKey].Sustained) {
267	// check if the sustain pointer has to be moved, now that we kill the voice
268	RTEList<Voice*>::NodeHandle hSustainPtr = pMIDIKeyInfo[pVoice->MIDIKey].hSustainPtr;
269	if (hSustainPtr) {
270	Voice** pVoicePtr = pMIDIKeyInfo[pVoice->MIDIKey].pActiveVoices->set_current(hSustainPtr);
271	if (pVoicePtr) {
272	if (*pVoicePtr == pVoice) { // move sustain pointer to the next sustained voice
273	dmsg(3,("Correcting sustain pointer\n"));
274	pMIDIKeyInfo[pVoice->MIDIKey].pActiveVoices->next();
275	pMIDIKeyInfo[pVoice->MIDIKey].hSustainPtr = pMIDIKeyInfo[pVoice->MIDIKey].pActiveVoices->current();
276	}
277	else dmsg(4,("ReleaseVoice(Voice): hSustain != pVoice\n"));
278	}
279	else dmsg(3,("ReleaseVoice(Voice*): pVoicePtr == null\n"));
280	}
281	else dmsg(3,("ReleaseVoice(Voice*): hSustainPtr == null\n"));
282	}
283
284	// remove the voice from the list associated with this MIDI key
285	ActiveVoicePool->free(pVoice->pSelfPtr);
286
287	// check if there are no voices left on the MIDI key and update the key info if so
288	if (pMIDIKeyInfo[pVoice->MIDIKey].pActiveVoices->is_empty()) {
289	pMIDIKeyInfo[pVoice->MIDIKey].hSustainPtr = NULL;
290	if (pMIDIKeyInfo[pVoice->MIDIKey].Sustained) {
291	SustainedKeyPool->free(pMIDIKeyInfo[pVoice->MIDIKey].pSustainPoolNode);
292	pMIDIKeyInfo[pVoice->MIDIKey].pSustainPoolNode = NULL;
293	pMIDIKeyInfo[pVoice->MIDIKey].Sustained = false;
294	}
295	dmsg(3,("Key has no more voices now\n"));
296	}
297	}
298	else std::cerr << "Couldn't release voice! (pVoice == NULL)\n" << std::flush;
299	}
300
301	void AudioThread::ProcessControlChange(uint8_t Channel, uint8_t Number, uint8_t Value) {
302	dmsg(4,("AudioThread::ContinuousController c=%d n=%d v=%d\n", Channel, Number, Value));
303	if (Number == 64) {
304	if (Value >= 64 && PrevHoldCCValue < 64) {
305	dmsg(4,("PEDAL DOWN\n"));
306	SustainPedal = true;
307	}
308	if (Value < 64 && PrevHoldCCValue >= 64) {
309	dmsg(4,("PEDAL UP\n"));
310	SustainPedal = false;
311	// iterate through all keys that are currently sustained
312	for (uint* key = SustainedKeyPool->first(); key; key = SustainedKeyPool->next()) {
313	if (!pMIDIKeyInfo[*key].KeyPressed) { // release the voices on the key, if the key is not pressed anymore
314	// release all active voices on the midi key
315	Voice** pVoicePtr = pMIDIKeyInfo[*key].pActiveVoices->first();
316	while (pVoicePtr) {
317	Voice** pVoicePtrNext = pMIDIKeyInfo[*key].pActiveVoices->next();
318	dmsg(3,("Sustain CC: releasing voice on midi key %d\n", *key));
319	(*pVoicePtr)->Release();
320	pVoicePtr = pVoicePtrNext;
321	}
322	}
323	SustainedKeyPool->free(pMIDIKeyInfo[*key].pSustainPoolNode);
324	pMIDIKeyInfo[*key].pSustainPoolNode = NULL;
325	pMIDIKeyInfo[*key].Sustained = false;
326	pMIDIKeyInfo[*key].hSustainPtr = NULL;
327	}
328	//SustainedKeyPool->empty();
329	}
330	PrevHoldCCValue = Value;
331	}
332	}
333
334	void AudioThread::CacheInitialSamples(gig::Sample* pSample) {
335	if (!pSample \|\| pSample->GetCache().Size) return;
336	if (pSample->SamplesTotal <= NUM_RAM_PRELOAD_SAMPLES) {
337	// Sample is too short for disk streaming, so we load the whole
338	// sample into RAM and place 'pAudioIO->FragmentSize << MAX_PITCH'
339	// number of '0' samples (silence samples) behind the official buffer
340	// border, to allow the interpolator do it's work even at the end of
341	// the sample.
342	gig::buffer_t buf = pSample->LoadSampleDataWithNullSamplesExtension((pAudioIO->FragmentSize << MAX_PITCH) + 3);
343	dmsg(4,("Cached %d Bytes, %d silence bytes.\n", buf.Size, buf.NullExtensionSize));
344	}
345	else { // we only cache NUM_RAM_PRELOAD_SAMPLES and stream the other sample points from disk
346	pSample->LoadSampleData(NUM_RAM_PRELOAD_SAMPLES);
347	}
348
349	if (!pSample->GetCache().Size) std::cerr << "Unable to cache sample - maybe memory full!" << std::endl << std::flush;
350	}