[Stk] Simple question regarding real-time MIDI input
Ge Wang
gewang@CS.Princeton.EDU
Tue, 23 Mar 2004 00:38:13 -0500
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I apologize for the multiple posts. i have (already) found
a bug with my code: the velocity was set at the wrong place.
the corrected code is below.
Best,
Ge!
---
// (modified) rtsine.cpp STK tutorial program with midi input
#include "WaveLoop.h"
#include "RtWvOut.h"
#include "RtMidi.h"
#include "SKINI.h"
int main()
{
// Set the global sample rate before creating class instances.
Stk::setSampleRate( 44100.0 );
WaveLoop *input = 0;
RtWvOut * output = 0;
RtMidi * midi = 0;
double vel = 0.0;
int key_count = 0, count = 0;
try {
// Define and load the sine wave file
input = new WaveLoop( "rawwaves/sinewave.raw", TRUE );
// Define and open the default realtime output device for
one-channel playback
output = new RtWvOut(1);
// instantiate midi input 0
midi = new RtMidi;
}
catch (StkError &) {
goto cleanup;
}
printf( "starting to poll for midi input...\n" );
// play the oscillator with MIDI
for (;;)
{
// poll MIDI every N samples (regardless of buffer size - may
want to improve this)
if( ++count >= 100 )
{
if( midi->nextMessage() ) // poll
{
if( midi->getType() == 0x90 ) // note on
{
if( (int)( midi->getByteThree() ) ) // velocity
{
// set frequency
input->setFrequency(
Midi2Pitch[(int)(midi->getByteTwo()+.5)] );
// set velocity
vel = midi->getByteThree();
// increment keys down
key_count++;
}
// most kb controllers send 0-velocity note-on
messages for "key-up"
else key_count--;
}
else if( midi->getType() == 0x80 ) // note off
key_count--;
}
// reset count
count = 0;
}
try {
output->tick( key_count > 0 ? input->tick() * (vel/128.0) :
0.0 );
}
catch (StkError &) {
goto cleanup;
}
}
cleanup:
delete input;
delete output;
delete midi;
return 0;
}
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<fixed><color><param>0000,0000,0000</param>
I apologize for the multiple posts. i have (already) found
a bug with my code: the velocity was set at the wrong place.
the corrected code is below.
Best,
Ge!</color><color><param>2323,6E6E,2525</param>
---
// (modified) rtsine.cpp STK tutorial program with midi input</color>
<color><param>6868,3838,2121</param>#include "WaveLoop.h"</color>
<color><param>6868,3838,2121</param>#include "RtWvOut.h"</color>
<color><param>6868,3838,2121</param>#include "RtMidi.h"</color>
<color><param>6868,3838,2121</param>#include "SKINI.h"</color>
<color><param>7676,0F0F,5050</param>int</color> main()
{
<color><param>2323,6E6E,2525</param>// Set the global sample rate
before creating class instances.</color>
Stk::setSampleRate(
<color><param>0000,0000,FFFF</param>44100.0</color> );
WaveLoop *input = <color><param>0000,0000,FFFF</param>0</color>;
RtWvOut * output = <color><param>0000,0000,FFFF</param>0</color>;
RtMidi * midi = <color><param>0000,0000,FFFF</param>0</color>;
<color><param>7676,0F0F,5050</param>double</color> vel =
<color><param>0000,0000,FFFF</param>0.0</color>;
<color><param>7676,0F0F,5050</param>int</color> key_count =
<color><param>0000,0000,FFFF</param>0</color>, count =
<color><param>0000,0000,FFFF</param>0</color>;
<color><param>7676,0F0F,5050</param>try</color> {
<color><param>2323,6E6E,2525</param>// Define and load the
sine wave file</color>
input = <color><param>7676,0F0F,5050</param>new</color>
WaveLoop(
<color><param>8989,1313,1515</param>"rawwaves/sinewave.raw"</color>,
<color><param>7676,0F0F,5050</param>TRUE</color> );
<color><param>2323,6E6E,2525</param>// Define and open the
default realtime output device for one-channel playback</color>
output = <color><param>7676,0F0F,5050</param>new</color>
RtWvOut(<color><param>0000,0000,FFFF</param>1</color>);
<color><param>2323,6E6E,2525</param>// instantiate midi input 0</color>
midi = <color><param>7676,0F0F,5050</param>new</color> RtMidi;
}
<color><param>7676,0F0F,5050</param>catch</color> (StkError &) {
<color><param>7676,0F0F,5050</param>goto</color> cleanup;
}
printf( <color><param>8989,1313,1515</param>"starting to poll for
midi input...\n"</color> );
<color><param>2323,6E6E,2525</param>// play the oscillator with
MIDI</color>
<color><param>7676,0F0F,5050</param>for</color> (;;)
{
<color><param>2323,6E6E,2525</param>// poll MIDI every N
samples (regardless of buffer size - may want to improve this)</color>
<color><param>7676,0F0F,5050</param>if</color>( ++count >=
<color><param>0000,0000,FFFF</param>100</color> )
{
<color><param>7676,0F0F,5050</param>if</color>(
midi->nextMessage() ) <color><param>2323,6E6E,2525</param>// poll</color>
{
<color><param>7676,0F0F,5050</param>if</color>(
midi->getType() == <color><param>0000,0000,FFFF</param>0x90</color> )
<color><param>2323,6E6E,2525</param>// note on</color>
{
<color><param>7676,0F0F,5050</param>if</color>(
(<color><param>7676,0F0F,5050</param>int</color>)(
midi->getByteThree() ) ) <color><param>2323,6E6E,2525</param>//
velocity</color>
{
<color><param>2323,6E6E,2525</param>// set
frequency</color>
input->setFrequency(
Midi2Pitch[(<color><param>7676,0F0F,5050</param>int</color>)(midi->getByteTwo()<color><param>0000,0000,FFFF</param>+.5</color>)]
);
<color><param>2323,6E6E,2525</param>// set velocity</color>
vel = midi->getByteThree();
<color><param>2323,6E6E,2525</param>// increment keys down</color>
key_count++;
}
<color><param>2323,6E6E,2525</param>// most kb
controllers send 0-velocity note-on messages for "key-up"</color>
<color><param>7676,0F0F,5050</param>else</color>
key_count--;
}
<color><param>7676,0F0F,5050</param>else</color>
<color><param>7676,0F0F,5050</param>if</color>( midi->getType() ==
<color><param>0000,0000,FFFF</param>0x80</color> )
<color><param>2323,6E6E,2525</param>// note off</color>
key_count--;
}
<color><param>2323,6E6E,2525</param>// reset count</color>
count = <color><param>0000,0000,FFFF</param>0</color>;
}
<color><param>7676,0F0F,5050</param>try</color> {
output->tick( key_count >
<color><param>0000,0000,FFFF</param>0</color> ? input->tick() *
(vel/<color><param>0000,0000,FFFF</param>128.0</color>) :
<color><param>0000,0000,FFFF</param>0.0</color> );
}
<color><param>7676,0F0F,5050</param>catch</color> (StkError &) {
<color><param>7676,0F0F,5050</param>goto</color> cleanup;
}
}
cleanup:
<color><param>7676,0F0F,5050</param>delete</color> input;
<color><param>7676,0F0F,5050</param>delete</color> output;
<color><param>7676,0F0F,5050</param>delete</color> midi;
<color><param>7676,0F0F,5050</param>return</color>
<color><param>0000,0000,FFFF</param>0</color>;
}</fixed>
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