package org.jcodec.audio;

import java.nio.FloatBuffer;
import org.jcodec.common.AudioFormat;

public class ChannelSplit implements AudioFilter {
  private AudioFormat format;
  
  public ChannelSplit(AudioFormat format) {
    this.format = format;
  }
  
  public void filter(FloatBuffer[] _in, long[] inPos, FloatBuffer[] out) {
    if (_in.length != 1)
      throw new IllegalArgumentException("Channel split invoked on more then one input"); 
    if (out.length != this.format.getChannels())
      throw new IllegalArgumentException("Channel split must be supplied with " + this.format.getChannels() + " output buffers to hold the channels."); 
    FloatBuffer in0 = _in[0];
    int outSampleCount = in0.remaining() / out.length;
    for (int i = 0; i < out.length; i++) {
      if (out[i].remaining() < outSampleCount)
        throw new IllegalArgumentException("Supplied buffer for " + i + "th channel doesn't have sufficient space to put the samples ( required: " + outSampleCount + ", actual: " + out[i]
            
            .remaining() + ")"); 
    } 
    while (in0.remaining() >= this.format.getChannels()) {
      for (int j = 0; j < out.length; j++)
        out[j].put(in0.get()); 
    } 
  }
  
  public int getDelay() {
    return 0;
  }
  
  public int getNInputs() {
    return 1;
  }
  
  public int getNOutputs() {
    return this.format.getChannels();
  }
}