package org.jcodec.audio;

import java.io.IOException;
import java.nio.FloatBuffer;

public class Audio {
  public static void transfer(AudioSource src, AudioSink sink) throws IOException {
    filterTransfer(src, new DummyFilter(1), sink);
  }
  
  public static void filterTransfer(AudioSource src, AudioFilter filter, AudioSink sink) throws IOException {
    if (filter.getNInputs() != 1)
      throw new IllegalArgumentException("Audio filter has # inputs != 1"); 
    if (filter.getNOutputs() != 1)
      throw new IllegalArgumentException("Audio filter has # outputs != 1"); 
    if (filter.getDelay() != 0)
      throw new IllegalArgumentException("Audio filter has delay"); 
    FloatBuffer[] ins = { FloatBuffer.allocate(4096) };
    FloatBuffer[] outs = { FloatBuffer.allocate(8192) };
    long[] pos = new long[1];
    while (src.readFloat(ins[0]) != -1) {
      ins[0].flip();
      filter.filter(ins, pos, outs);
      pos[0] = pos[0] + (long)ins[0].position();
      rotate(ins[0]);
      outs[0].flip();
      sink.writeFloat(outs[0]);
      outs[0].clear();
    } 
  }
  
  public static void print(FloatBuffer buf) {
    FloatBuffer dup = buf.duplicate();
    while (dup.hasRemaining())
      System.out.print(String.format("%.3f,", dup.get())); 
    System.out.println();
  }
  
  public static void rotate(FloatBuffer buf) {
    int pos;
    for (pos = 0; buf.hasRemaining(); pos++)
      buf.put(pos, buf.get()); 
    buf.position(pos);
    buf.limit(buf.capacity());
  }
  
  public static class DummyFilter implements AudioFilter {
    private int nInputs;
    
    public DummyFilter(int nInputs) {
      this.nInputs = nInputs;
    }
    
    public void filter(FloatBuffer[] _in, long[] inPos, FloatBuffer[] out) {
      for (int i = 0; i < _in.length; i++) {
        if (out[i].remaining() >= _in[i].remaining()) {
          out[i].put(_in[i]);
        } else {
          FloatBuffer duplicate = _in[i].duplicate();
          duplicate.limit(_in[i].position() + out[i].remaining());
          out[i].put(duplicate);
        } 
      } 
    }
    
    public int getDelay() {
      return 0;
    }
    
    public int getNInputs() {
      return this.nInputs;
    }
    
    public int getNOutputs() {
      return this.nInputs;
    }
  }
}