I have a program I'm working on that uses the Beads library to sample songs and change the rate at which they're played (this is done using a potentiometer—I'm sending data in from an Arduino to control the rate).
In this program, the sound clip is established in the void setup() function.
However, I would like to be able to change the song sample dynamically, in void draw(), depending on what data the program is receiving. I have five different songs, and I want the Processing program to play a different song, depending on whether the values it's receiving are between 1-100, 101-200, 201-300, 301-400, or 401-500.
Here is my code so far:
float derp = 0;
// this is a more complex sampler
// clicking somewhere on the window initiates sample playback
// moving the mouse controls the playback rate
// we can run both SamplePlayers through the same Gain
port = new Serial(this, "/dev/tty.usbmodem411", 9600);
ac = new AudioContext(); // create our AudioContext
// whenever we load a file, we need to enclose the code in a Try/Catch block
// Try/Catch blocks will inform us if the file can't be found
// initialize the SamplePlayer
sp1 = new SamplePlayer(ac, new Sample(sketchPath("") + "prelude_no_8.mp3"));
// if there is an error, show an error message (at the bottom of the processing window)
println("Exception while attempting to load sample!");
e.printStackTrace(); // then print a technical description of the error
exit(); // and exit the program
// note that we want to play the sample multiple times
rateValue = new Glide(ac, 1, 30); // initialize our rateValue Glide object
sp1.setRate(rateValue); // connect it to the SamplePlayer
// as usual, we create a gain that will control the volume of our sample player
gainValue = new Glide(ac, 0.0, 30);
sampleGain = new Gain(ac, 1, gainValue);
ac.out.addInput(sampleGain); // connect the Gain to the AudioContext
ac.start(); // begin audio processing
background(0); // set the background to black
line(width/2, 0, width/2, height); // draw a line in the middle
text("Click to begin playback.", 100, 100); // tell the user what to do!
text("Move the mouse to control playback speed.", 100, 120); // tell the user what to do!
// although we're not drawing to the screen, we need to have a draw function
// in order to wait for mousePressed events
float halfWidth = width / 2.0;
gainValue.setValue((float)mouseY / (float)height); // set the gain based on mouse position along the Y-axis
rateValue.setValue(((float)derp - halfWidth)/halfWidth); // set the rate based on mouse position along the X-axis
println((float)mouseY / (float)height);
println(((float)derp - halfWidth)/halfWidth);
// this routine is called whenever a mouse button is pressed on the Processing sketch
// if the left mouse button is clicked, then play the sound
if( mouseX > width / 2.0 )
sp1.setPosition(000); // set the start position to the beginning
sp1.start(); // play the audio file
// if the right mouse button is clicked, then play the bass drum sample backwards
sp1.setToEnd(); // set the start position to the end of the file
sp1.start(); // play the file in reverse (rate set in the draw routine)
void serialEvent (Serial port)
derp = float(port.readStringUntil('\n'));
Any help would be largely appreciated! Thank you!