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//=============================================================================
// MusE
// Linux Music Editor
// $Id:$
//
// Copyright (C) 2002-2006 by Werner Schweer and others
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License version 2.
//
// 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., 675 Mass Ave, Cambridge, MA 02139, USA.
//=============================================================================
#include "audio.h"
#include "ticksynth.h"
#include "default_click.h"
SynthI* metronome = 0;
class MetronomeSynth;
static MetronomeSynth* metronomeSynth;
//---------------------------------------------------------
// MetronomeSynth
//---------------------------------------------------------
class MetronomeSynth : public Synth {
public:
MetronomeSynth(const QFileInfo* fi) : Synth(fi, QString("Metronome")) {}
virtual ~MetronomeSynth() {}
virtual void incInstances(int) {}
virtual void* instantiate();
virtual SynthIF* createSIF(SynthI*);
};
//---------------------------------------------------------
// instantiate
//---------------------------------------------------------
void* MetronomeSynth::instantiate()
{
return 0;
}
//---------------------------------------------------------
// MetronomeSynthIF
//---------------------------------------------------------
class MetronomeSynthIF : public SynthIF
{
const float* data;
int pos;
int len;
void process(float** buffer, int offset, int n);
public:
MetronomeSynthIF(SynthI* s) : SynthIF(s) {
data = 0;
}
virtual bool guiVisible() const { return false; }
virtual void showGui(bool) {}
virtual bool hasGui() const { return false; }
virtual void getGeometry(int*, int*, int*, int*) const {}
virtual void setGeometry(int, int, int, int) {}
virtual void getData(MidiEventList*, unsigned pos, int ports, unsigned n, float** buffer);
virtual bool putEvent(const MidiEvent& ev);
virtual MidiEvent receiveEvent() { return MidiEvent(); }
virtual int eventsPending() const { return 0; }
virtual int channels() const { return 1; }
virtual void deactivate2() {}
virtual void deactivate3() {}
virtual QString getPatchName(int, int, int) const { return ""; }
virtual QString getPatchName(int, int) { return ""; }
virtual void populatePatchPopup(QMenu*, int) {};
virtual void write(Xml&) const {}
virtual void setParameter(int, float) {}
virtual int getControllerInfo(int, const char**, int*, int*, int*) { return 0; }
virtual bool hasAuxSend() const { return false; }
};
//---------------------------------------------------------
// getData
//---------------------------------------------------------
void MetronomeSynthIF::getData(MidiEventList* el, unsigned pos, int/*ports*/, unsigned n, float** buffer)
{
unsigned curPos = pos;
unsigned endPos = pos + n;
unsigned off = pos;
iMidiEvent i = el->begin();
for (; i != el->end(); ++i) {
unsigned frame = i->time();
if (frame >= endPos)
break;
if (frame > curPos) {
if (frame < pos)
printf("should not happen: missed event %d\n", pos -frame);
else
process(buffer, curPos-pos, frame - curPos);
curPos = frame;
}
putEvent(*i);
}
if (endPos - curPos)
process(buffer, curPos - off, endPos - curPos);
el->erase(el->begin(), i);
}
//---------------------------------------------------------
// putEvent
//---------------------------------------------------------
bool MetronomeSynthIF::putEvent(const MidiEvent& ev)
{
if (ev.dataA() == 0) {
data = defaultClickEmphasis;
len = defaultClickEmphasisLength;
}
else {
data = defaultClick;
len = defaultClickLength;
}
pos = 0;
return false;
}
//---------------------------------------------------------
// createSIF
//---------------------------------------------------------
SynthIF* MetronomeSynth::createSIF(SynthI* s)
{
return new MetronomeSynthIF(s);
}
//---------------------------------------------------------
// process
// synthesize n samples into buffer+offset
//---------------------------------------------------------
void MetronomeSynthIF::process(float** buffer, int offset, int n)
{
if (data == 0) {
memset(buffer[0], 0, n * sizeof(float));
return;
}
const float* s = data + pos;
float* d = *buffer + offset;
int l = std::min(n, len);
int i;
for (i = 0; i < l; ++i)
*d++ = *s++;
for (; i < n; ++i)
*d++ = 0.0f;
pos += l;
len -= l;
if (len <= 0)
data = 0;
}
//---------------------------------------------------------
// initMetronome
//---------------------------------------------------------
void initMetronome()
{
QFileInfo fi; // dummy
metronomeSynth = new MetronomeSynth(&fi);
metronome = new SynthI();
metronome->setName("metronome");
metronome->initInstance(metronomeSynth);
}
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