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Topic: Sonia - playing it backwards (Read 403 times) |
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md
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Sonia - playing it backwards
« on: May 17th, 2004, 5:32pm » |
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I'm trying to play a sample backwards.
What am I missing here?
code:
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Sample mySample;
float[] sampleData;
int streamSize;
void setup(){
size(200, 200);
Sonia.start(this);
mySample = new Sample("test.aif");
streamSize = mySample.getNumFrames();
sampleData = new float[streamSize];
mySample.read(sampleData);
LiveOutput.start(streamSize,streamSize*2);
LiveOutput.startStream();
}
void loop(){
}
void liveOutputEvent(){
for(int i=LiveOutput.data.length;i>0;i--) {
LiveOutput.data[i] = sampleData[i];
}
}
public void stop(){
Sonia.stop();
super.stop();
}
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mattgilbert
 
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Re: Sonia - playing it backwards
« Reply #1 on: May 17th, 2004, 8:31pm » |
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The problem is with your liveOutputEvent block. I see that you're trying to update the data backwards, but what you have doesn't do that.
Code:
void liveOutputEvent(){
for(int i=LiveOutput.data.length;i>0;i--) {
LiveOutput.data[i] = sampleData[i];
}
}
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does almost exactly the same thing as
Code:
void liveOutputEvent(){
for(int i=0;i<LiveOutput.data.length;i++) {
LiveOutput.data[i] = sampleData[i];
}
}
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to reverse the order of the floats in LiveOutput.data, you need something like:
Code:
void liveOutputEvent(){
for(int i=0;i<LiveOutput.data.length;i++) {
LiveOutput.data[i] = sampleData[sampleData.length-1-i];
}
}
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the difference being that I'm pulling the floats from sampleData[] starting at the end with the sampleData[sampleData.length-1-i] part. At the beginning of the update, when i=0, this takes the last element in the sampleData[] (element sampleData.length-1, since the elements are numbered starting at zero), and puts it in the first element of LiveOutput.data[]. Then it works forwards on LiveOutput.data[] and backwards on sampleData, reversing the order of the data.
Did I explain that ok?
Matt
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md
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Re: Sonia - playing it backwards
« Reply #2 on: May 17th, 2004, 9:17pm » |
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Off course! I gues I spend too mutch time inside.
Your answer was great! Thanks for your time 'and your understanding  '
-m
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mattgilbert
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Re: Sonia - playing it backwards
« Reply #3 on: May 19th, 2004, 7:13am » |
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right on.
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