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/**
* Copyright (c) 2011, The University of Southampton and the individual contributors.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* * Neither the name of the University of Southampton nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
*
*/
package org.openimaj.audio;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.openimaj.audio.processor.AudioProcessor;
import org.openimaj.audio.processor.FixedSizeSampleAudioProcessor;
import org.openimaj.audio.samples.SampleBuffer;
import org.openimaj.audio.samples.SampleBufferFactory;
import org.openimaj.audio.timecode.AudioTimecode;
/**
* A basic audio mixer that takes a number of {@link AudioStream}s and mixes
* then with some gain compensation into a single audio stream.
*
* @author David Dupplaw ([email protected])
* @created 23rd November 2011
*/
public class AudioMixer extends AudioStream
{
/**
* A listener for objects that wish to be informed of a mix event. The mix
* event provides the sample buffers of all the channels and the sample
* buffer of the mixed stream. It is called before the mixed stream chunk is
* returned from each mix event.
*
* @author David Dupplaw ([email protected])
*
* @created 29 Nov 2011
*/
public interface MixEventListener
{
/**
* Callback for a mix event.
*
* @param channels
* the channels being mixed
* @param mix
* the mixed channel
*/
public void mix(SampleBuffer[] channels, SampleBuffer mix);
}
/** A list of the audio streams to mix in this mixer */
private final List streams = new ArrayList();
private final List gain = new ArrayList();
private final Map streamMap = new HashMap();
/** The currently processed sample in the mixer */
private SampleBuffer currentSample = null;
/** The size of each mix - the sample buffer size */
private int bufferSize = 256;
/**
* If set to TRUE, this will cause the mixer to run even when there are not
* streams to play. It does this by returning empty sample chunks.
*/
private boolean alwaysRun = true;
/** The time the mixer started */
private long startMillis = -1;
/** The timecode we're using */
private AudioTimecode timecode = null;
/** Listeners of the mix event */
private final List mixEventListeners =
new ArrayList();
/** Whether or not to fire mix events */
private boolean fireMixEvents = false;
/**
* Default constructor that takes the format for the samples. All streams
* added to this mixer must conform to that sample format.
*
* @param af
* The {@link AudioFormat}
*/
public AudioMixer(final AudioFormat af)
{
this.setFormat(af);
// Create the current sample chunk that we'll reuse
this.currentSample = SampleBufferFactory.createSampleBuffer(af, this.bufferSize);
this.timecode = new AudioTimecode(0);
}
/**
* The timecode object
*
* @param tc
* The timecode object.
*/
public void setTimecodeObject(final AudioTimecode tc)
{
this.timecode = tc;
}
/**
* Add an {@link AudioStream} to this mixer. It must conform to the same
* format as this mixer. If not, an {@link IllegalArgumentException} will be
* thrown.
*
* @param as The {@link AudioStream} to add to this mixer.
* @param defaultGain
* The default gain of this stream.
*/
public void addStream(final AudioStream as, final float defaultGain)
{
if (as.format.equals(this.getFormat()))
{
AudioStream stream = as;
// It's important that the incoming sample chunks from
// the input streams are equal in length, so we wrap them
// all in FixedSampleSizeAudioProcessor. However, before we
// do we check whether they already are fixed sized chunks.
// We can't check with just a instanceof because that will also
// be true for subclasses and we can't be sure they're doing more.
// So, we must check ONLY for instances of EXACTLY
// FixedSampleSizeAudioProcessors.
if (stream.getClass().getName().equals(
FixedSizeSampleAudioProcessor.class.getName()))
{
// Get the underlying stream.
stream = ((AudioProcessor) as).getUnderlyingStream();
}
// Set the gain
this.gain.add(defaultGain);
// Add the stream wrapped in a fixed size audio processor.
synchronized (this.streams)
{
// Wrap the stream in a FixedSizeSampleAudioProcessor
final FixedSizeSampleAudioProcessor fssap =
new FixedSizeSampleAudioProcessor(stream, this.bufferSize);
this.streams.add(fssap);
this.streamMap.put(as, fssap);
}
}
else
throw new IllegalArgumentException("Format of added stream is " +
"incompatible with the mixer.");
}
/**
* {@inheritDoc}
*
* @see org.openimaj.audio.AudioStream#nextSampleChunk()
*/
@Override
synchronized public SampleChunk nextSampleChunk()
{
// If there are no streams attached to this mixer, then
// we return null - end of mixer stream.
if (this.streams.size() == 0 && !this.alwaysRun)
return null;
// Set the time the mixer started
if (this.startMillis == -1)
this.startMillis = System.currentTimeMillis();
// Get the next sample chunk from each stream.
final SampleBuffer sb = this.currentSample;
SampleChunk sc = null;
final List chunkList = new ArrayList();
synchronized (this.streams)
{
for (int stream = 0; stream < this.streams.size(); stream++)
{
// We can do this because the sample chunks from all the streams
// are forced to be the same size!
sc = this.streams.get(stream).nextSampleChunk();
// Get the next chunk and add it to a list for going through
// later
if (sc != null)
{
// System.out.println(
// this+" Stream "+stream+" size "+sc.getNumberOfSamples()
// );
chunkList.add(sc.getSampleBuffer());
}
else
{
// Got to the end of the stream, so we'll remove it
this.streams.remove(stream);
this.gain.remove(stream);
}
}
// System.out.println( chunkList +" -> "+this.gain );
// Now create the new sample chunk by averaging the samples
// at each point from all streams
for (int i = 0; i < sb.size(); i++)
{
float Z = 0;
for (int stream = 0; stream < chunkList.size(); stream++)
if (chunkList.get(stream) != null)
Z += chunkList.get(stream).get(i) * this.gain.get(stream);
// Set the value in the new sample buffer
sb.set(i, Z);
}
}
// Fire the mix event
if (this.fireMixEvents)
for (final MixEventListener mel : this.mixEventListeners)
mel.mix(chunkList.toArray(new SampleBuffer[0]), sb);
// Create a SampleChunk for our mix stream
sc = sb.getSampleChunk();
this.timecode.setTimecodeInMilliseconds(System.currentTimeMillis() -
this.startMillis);
sc.setStartTimecode(this.timecode);
return sc;
}
/**
* {@inheritDoc}
*
* @see org.openimaj.audio.AudioStream#reset()
*/
@Override
public void reset()
{
// No implementation
}
/**
* Set the size of the buffer that the mixer will mix. Note that this must
* be done before any streams are added to the mixer.
*
* @param bufferSize
* The buffer size in samples per channel.
*/
public void setBufferSize(final int bufferSize)
{
this.bufferSize = bufferSize;
this.currentSample = SampleBufferFactory.createSampleBuffer(
this.format, bufferSize);
}
/**
* Whether to run the mixer when there are no audio streams to mix.
*
* @param alwaysRun
* TRUE to make the mixer always run.
*/
public void setAlwaysRun(final boolean alwaysRun)
{
this.alwaysRun = alwaysRun;
}
/**
* Add a mix event listener to this AudioMixer.
*
* @param mel
* The {@link MixEventListener} to add
*/
public void addMixEventListener(final MixEventListener mel)
{
this.mixEventListeners.add(mel);
}
/**
* Remove the given {@link MixEventListener} from this mixer.
*
* @param mel
* The {@link MixEventListener} to remove
*/
public void removeMixEventListener(final MixEventListener mel)
{
this.mixEventListeners.remove(mel);
}
/**
* {@inheritDoc}
*
* @see org.openimaj.audio.AudioStream#getLength()
*/
@Override
public long getLength()
{
return -1;
}
/**
* Whether to fire mix events or not (default is that the mixer doesn't)
*
* @param tf
* TRUE to fire mix events.
*/
public void setMixEvents(final boolean tf)
{
this.fireMixEvents = tf;
}
/**
* Remove the given audio stream from the mixer.
*
* @param as The audio stream to remove
*/
public void removeStream(final AudioStream as)
{
synchronized (this.streams)
{
AudioStream aas = this.streamMap.get(as);
if (aas == null)
aas = as;
System.out.println("Removing " + aas + " from " + this.streams);
this.gain.remove(this.streams.indexOf(aas));
this.streams.remove(this.streams.indexOf(aas));
}
}
}
