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++) {
        pActiveVoices[i] = new RTEList<Voice*>;
    }
    SustainedKeyPool = new RTELMemoryPool<sustained_key_t>(200);

    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->read(&command, 1) == 0) break;

            switch (command.type) {
                case command_type_note_on:
                    dmsg(5,("Audio Thread: Note on received\n"));
                    ActivateVoice(command.pitch, command.velocity);
                    break;
                case command_type_note_off:
                    dmsg(5,("Audio Thread: Note off received\n"));
                    ReleaseVoice(command.pitch, command.velocity);
                    break;
                case command_type_continuous_controller:
                    dmsg(5,("Audio Thread: MIDI CC received\n"));
                    ContinuousController(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;


        // 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::ProcessNoteOn(uint8_t Pitch, uint8_t Velocity) {
    command_t cmd;
    cmd.type     = command_type_note_on;
    cmd.pitch    = Pitch;
    cmd.velocity = Velocity;
    this->pCommandQueue->write(&cmd, 1);
}

/// Will be called by the MIDIIn Thread to signal the audio thread to release a voice.
void AudioThread::ProcessNoteOff(uint8_t Pitch, uint8_t Velocity) {
    command_t cmd;
    cmd.type     = command_type_note_off;
    cmd.pitch    = Pitch;
    cmd.velocity = Velocity;
    this->pCommandQueue->write(&cmd, 1);
}

// Will be called by the MIDIIn Thead to send MIDI continuos controller events
void AudioThread::ProcessContinuousController(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;
    this->pCommandQueue->write(&cmd, 1);
}

void AudioThread::ActivateVoice(uint8_t MIDIKey, uint8_t Velocity) {
    for (int i = 0; i < MAX_AUDIO_VOICES; i++) {
        if (pVoices[i]->IsActive()) continue;
        pVoices[i]->Trigger(MIDIKey, Velocity, this->pInstrument);
        // add (append) a new voice to the corresponding MIDIKey active voices list
        Voice** new_voice_ptr = ActiveVoicePool->alloc_append(pActiveVoices[MIDIKey]);
        *new_voice_ptr = pVoices[i];
        pVoices[i]->pSelfPtr = new_voice_ptr; // FIXME: hack to allow fast deallocation
        return;
    }
    std::cerr << "No free voice!" << std::endl << std::flush;
}

void AudioThread::ReleaseVoice(uint8_t MIDIKey, uint8_t Velocity) {
    // if sustain pedal is pressed postpone the Note-Off
    if (SustainPedal) {
        // alloc an element in the SustainedKeyPool and add the current midikey to it
        sustained_key_t* key = SustainedKeyPool->alloc();
        if (key == NULL) printf("ERROR: SustainedKeyPool FULL ! exiting\n"); // FIXME
        key->midikey  = MIDIKey;
        key->velocity = Velocity;
    }
    else {
        // get the first voice in the list of active voices on the MIDI Key
        Voice** pVoicePtr = pActiveVoices[MIDIKey]->first();
        if (pVoicePtr) ReleaseVoice(*pVoicePtr);
        else std::cerr << "Couldn't find active voice for note off command!" << std::endl << std::flush;
    }
}

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

        // remove the voice from the list associated to this MIDI key
        ActiveVoicePool->free(pVoice->pSelfPtr);
    }
    else std::cerr << "Couldn't find active voice to release!" << std::endl << std::flush;
}

void AudioThread::ContinuousController(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;
            for (sustained_key_t* key = SustainedKeyPool->first(); key; key = SustainedKeyPool->next()) {
                ReleaseVoice(key->midikey, key->velocity);
            }
            // empty the SustainedKeyPool (free all the elements)
            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);
        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	pActiveVoices[i] = new RTEList<Voice*>;
39	}
40	SustainedKeyPool = new RTELMemoryPool<sustained_key_t>(200);
41
42	pAudioSumBuffer = new float[pAudioIO->FragmentSize * pAudioIO->Channels];
43
44	// set all voice outputs to the AudioSumBuffer
45	for (int i = 0; i < MAX_AUDIO_VOICES; i++) {
46	pVoices[i]->SetOutput(pAudioSumBuffer, pAudioIO->FragmentSize * 2); //FIXME: assuming stereo
47	}
48
49	// cache initial samples points (for actually needed samples)
50	dmsg(1,("Caching initial samples..."));
51	gig::Region* pRgn = this->pInstrument->GetFirstRegion();
52	while (pRgn) {
53	if (!pRgn->GetSample()->GetCache().Size) {
54	dmsg(2,("C"));
55	CacheInitialSamples(pRgn->GetSample());
56	}
57	for (uint i = 0; i < pRgn->DimensionRegions; i++) {
58	CacheInitialSamples(pRgn->pDimensionRegions[i]->pSample);
59	}
60
61	pRgn = this->pInstrument->GetNextRegion();
62	}
63
64	// sustain pedal value
65	PrevHoldCCValue = 0;
66	SustainPedal = 0;
67
68	dmsg(1,("OK\n"));
69	}
70
71	AudioThread::~AudioThread() {
72	if (pCommandQueue) delete pCommandQueue;
73	if (pVoices) {
74	for (uint i = 0; i < MAX_AUDIO_VOICES; i++) {
75	if (pVoices[i]) delete pVoices[i];
76	}
77	}
78	delete[] pVoices;
79	}
80
81	int AudioThread::Main() {
82	dmsg(2,("Audio thread running\n"));
83
84	while (true) {
85
86	// read and process commands from the queue
87	while (true) {
88	command_t command;
89	if (pCommandQueue->read(&command, 1) == 0) break;
90
91	switch (command.type) {
92	case command_type_note_on:
93	dmsg(5,("Audio Thread: Note on received\n"));
94	ActivateVoice(command.pitch, command.velocity);
95	break;
96	case command_type_note_off:
97	dmsg(5,("Audio Thread: Note off received\n"));
98	ReleaseVoice(command.pitch, command.velocity);
99	break;
100	case command_type_continuous_controller:
101	dmsg(5,("Audio Thread: MIDI CC received\n"));
102	ContinuousController(command.channel, command.number, command.value);
103	break;
104	}
105	}
106
107
108	// zero out the sum buffer
109	for (uint u = 0; u < pAudioIO->FragmentSize * pAudioIO->Channels; u++) {
110	pAudioSumBuffer[u] = 0.0;
111	}
112
113
114	// render audio from all active voices
115	int active_voices = 0;
116	for (uint i = 0; i < MAX_AUDIO_VOICES; i++) {
117	if (pVoices[i]->IsActive()) {
118	pVoices[i]->RenderAudio();
119	if (pVoices[i]->IsActive()) active_voices++; // still active
120	else { // voice reached end, is now inactive
121	ReleaseVoice(pVoices[i]); // remove voice from the list of active voices
122	}
123	}
124	}
125	// write that to the disk thread class so that it can print it
126	// on the console for debugging purposes
127	ActiveVoiceCount = active_voices;
128
129
130	// check clipping in the audio sum, convert to sample_type
131	// (from 32bit to 16bit sample) and copy to output buffer
132	float sample_point;
133	for (uint u = 0; u < pAudioIO->FragmentSize * pAudioIO->Channels; u++) {
134	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)
135	if (sample_point < -32768.0) sample_point = -32768.0;
136	if (sample_point > 32767.0) sample_point = 32767.0;
137	this->pAudioIO->pOutputBuffer[u] = (sample_t) sample_point;
138	}
139
140
141	// call audio driver to output sound
142	int res = this->pAudioIO->Output();
143	if (res < 0) exit(EXIT_FAILURE);
144	}
145	}
146
147	/// Will be called by the MIDIIn Thread to let the audio thread trigger a new voice.
148	void AudioThread::ProcessNoteOn(uint8_t Pitch, uint8_t Velocity) {
149	command_t cmd;
150	cmd.type = command_type_note_on;
151	cmd.pitch = Pitch;
152	cmd.velocity = Velocity;
153	this->pCommandQueue->write(&cmd, 1);
154	}
155
156	/// Will be called by the MIDIIn Thread to signal the audio thread to release a voice.
157	void AudioThread::ProcessNoteOff(uint8_t Pitch, uint8_t Velocity) {
158	command_t cmd;
159	cmd.type = command_type_note_off;
160	cmd.pitch = Pitch;
161	cmd.velocity = Velocity;
162	this->pCommandQueue->write(&cmd, 1);
163	}
164
165	// Will be called by the MIDIIn Thead to send MIDI continuos controller events
166	void AudioThread::ProcessContinuousController(uint8_t Channel, uint8_t Number, uint8_t Value) {
167	command_t cmd;
168	cmd.type = command_type_continuous_controller;
169	cmd.channel = Channel;
170	cmd.number = Number;
171	cmd.value = Value;
172	this->pCommandQueue->write(&cmd, 1);
173	}
174
175	void AudioThread::ActivateVoice(uint8_t MIDIKey, uint8_t Velocity) {
176	for (int i = 0; i < MAX_AUDIO_VOICES; i++) {
177	if (pVoices[i]->IsActive()) continue;
178	pVoices[i]->Trigger(MIDIKey, Velocity, this->pInstrument);
179	// add (append) a new voice to the corresponding MIDIKey active voices list
180	Voice** new_voice_ptr = ActiveVoicePool->alloc_append(pActiveVoices[MIDIKey]);
181	*new_voice_ptr = pVoices[i];
182	pVoices[i]->pSelfPtr = new_voice_ptr; // FIXME: hack to allow fast deallocation
183	return;
184	}
185	std::cerr << "No free voice!" << std::endl << std::flush;
186	}
187
188	void AudioThread::ReleaseVoice(uint8_t MIDIKey, uint8_t Velocity) {
189	// if sustain pedal is pressed postpone the Note-Off
190	if (SustainPedal) {
191	// alloc an element in the SustainedKeyPool and add the current midikey to it
192	sustained_key_t* key = SustainedKeyPool->alloc();
193	if (key == NULL) printf("ERROR: SustainedKeyPool FULL ! exiting\n"); // FIXME
194	key->midikey = MIDIKey;
195	key->velocity = Velocity;
196	}
197	else {
198	// get the first voice in the list of active voices on the MIDI Key
199	Voice** pVoicePtr = pActiveVoices[MIDIKey]->first();
200	if (pVoicePtr) ReleaseVoice(*pVoicePtr);
201	else std::cerr << "Couldn't find active voice for note off command!" << std::endl << std::flush;
202	}
203	}
204
205	void AudioThread::ReleaseVoice(Voice* pVoice) {
206	if (pVoice) {
207	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
208
209	// remove the voice from the list associated to this MIDI key
210	ActiveVoicePool->free(pVoice->pSelfPtr);
211	}
212	else std::cerr << "Couldn't find active voice to release!" << std::endl << std::flush;
213	}
214
215	void AudioThread::ContinuousController(uint8_t Channel, uint8_t Number, uint8_t Value) {
216	dmsg(4,("AudioThread::ContinuousController c=%d n=%d v=%d\n", Channel, Number, Value));
217	if (Number == 64) {
218	if (Value >= 64 && PrevHoldCCValue < 64) {
219	dmsg(4,("PEDAL DOWN\n"));
220	SustainPedal = true;
221	}
222	if (Value < 64 && PrevHoldCCValue >= 64) {
223	dmsg(4,("PEDAL UP\n"));
224	SustainPedal = false;
225	for (sustained_key_t* key = SustainedKeyPool->first(); key; key = SustainedKeyPool->next()) {
226	ReleaseVoice(key->midikey, key->velocity);
227	}
228	// empty the SustainedKeyPool (free all the elements)
229	SustainedKeyPool->empty();
230	}
231	PrevHoldCCValue = Value;
232	}
233	}
234
235	void AudioThread::CacheInitialSamples(gig::Sample* pSample) {
236	if (!pSample \|\| pSample->GetCache().Size) return;
237	if (pSample->SamplesTotal <= NUM_RAM_PRELOAD_SAMPLES) {
238	// Sample is too short for disk streaming, so we load the whole
239	// sample into RAM and place 'pAudioIO->FragmentSize << MAX_PITCH'
240	// number of '0' samples (silence samples) behind the official buffer
241	// border, to allow the interpolator do it's work even at the end of
242	// the sample.
243	gig::buffer_t buf = pSample->LoadSampleDataWithNullSamplesExtension(pAudioIO->FragmentSize << MAX_PITCH);
244	dmsg(4,("Cached %d Bytes, %d silence bytes.\n", buf.Size, buf.NullExtensionSize));
245	}
246	else { // we only cache NUM_RAM_PRELOAD_SAMPLES and stream the other sample points from disk
247	pSample->LoadSampleData(NUM_RAM_PRELOAD_SAMPLES);
248	}
249
250	if (!pSample->GetCache().Size) std::cerr << "Unable to cache sample - maybe memory full!" << std::endl << std::flush;
251	}