be.tarsos.dsp.AudioDispatcher Maven / Gradle / Ivy
/*
* _______ _____ _____ _____
* |__ __| | __ \ / ____| __ \
* | | __ _ _ __ ___ ___ ___| | | | (___ | |__) |
* | |/ _` | '__/ __|/ _ \/ __| | | |\___ \| ___/
* | | (_| | | \__ \ (_) \__ \ |__| |____) | |
* |_|\__,_|_| |___/\___/|___/_____/|_____/|_|
*
* -------------------------------------------------------------
*
* TarsosDSP is developed by Joren Six at IPEM, University Ghent
*
* -------------------------------------------------------------
*
* Info: http://0110.be/tag/TarsosDSP
* Github: https://github.com/JorenSix/TarsosDSP
* Releases: http://0110.be/releases/TarsosDSP/
*
* TarsosDSP includes modified source code by various authors,
* for credits and info, see README.
*
*/
package be.tarsos.dsp;
import java.io.IOException;
import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.logging.Level;
import java.util.logging.Logger;
import be.tarsos.dsp.io.TarsosDSPAudioFloatConverter;
import be.tarsos.dsp.io.TarsosDSPAudioFormat;
import be.tarsos.dsp.io.TarsosDSPAudioInputStream;
/**
* This class plays a file and sends float arrays to registered AudioProcessor
* implementors. This class can be used to feed FFT's, pitch detectors, audio players, ...
* Using a (blocking) audio player it is even possible to synchronize execution of
* AudioProcessors and sound. This behavior can be used for visualization.
* @author Joren Six
*/
public class AudioDispatcher implements Runnable {
/**
* Log messages.
*/
private static final Logger LOG = Logger.getLogger(AudioDispatcher.class.getName());
/**
* The audio stream (in bytes), conversion to float happens at the last
* moment.
*/
private final TarsosDSPAudioInputStream audioInputStream;
/**
* This buffer is reused again and again to store audio data using the float
* data type.
*/
private float[] audioFloatBuffer;
/**
* This buffer is reused again and again to store audio data using the byte
* data type.
*/
private byte[] audioByteBuffer;
/**
* A list of registered audio processors. The audio processors are
* responsible for actually doing the digital signal processing
*/
private final List audioProcessors;
/**
* Converter converts an array of floats to an array of bytes (and vice
* versa).
*/
private final TarsosDSPAudioFloatConverter converter;
private final TarsosDSPAudioFormat format;
/**
* The floatOverlap: the number of elements that are copied in the buffer
* from the previous buffer. Overlap should be smaller (strict) than the
* buffer size and can be zero. Defined in number of samples.
*/
private int floatOverlap, floatStepSize;
/**
* The overlap and stepsize defined not in samples but in bytes. So it
* depends on the bit depth. Since the int datatype is used only 8,16,24,...
* bits or 1,2,3,... bytes are supported.
*/
private int byteOverlap, byteStepSize;
/**
* The number of bytes to skip before processing starts.
*/
private long bytesToSkip;
/**
* Position in the stream in bytes. e.g. if 44100 bytes are processed and 16
* bits per frame are used then you are 0.5 seconds into the stream.
*/
private long bytesProcessed;
/**
* The audio event that is send through the processing chain.
*/
private AudioEvent audioEvent;
/**
* If true the dispatcher stops dispatching audio.
*/
private boolean stopped;
/**
* If true then the first buffer is only filled up to buffer size - hop size
* E.g. if the buffer is 2048 and the hop size is 48 then you get 2000 times
* zero 0 and 48 actual audio samples. During the next iteration you get
* mostly zeros and 96 samples.
*/
private boolean zeroPadFirstBuffer;
/**
* If true then the last buffer is zero padded. Otherwise the buffer is
* shortened to the remaining number of samples. If false then the audio
* processors must be prepared to handle shorter audio buffers.
*/
private boolean zeroPadLastBuffer;
/**
* Create a new dispatcher from a stream.
*
* @param stream
* The stream to read data from.
* @param audioBufferSize
* The size of the buffer defines how much samples are processed
* in one step. Common values are 1024,2048.
* @param bufferOverlap
* How much consecutive buffers overlap (in samples). Half of the
* AudioBufferSize is common (512, 1024) for an FFT.
*/
public AudioDispatcher(final TarsosDSPAudioInputStream stream, final int audioBufferSize, final int bufferOverlap){
// The copy on write list allows concurrent modification of the list while
// it is iterated. A nice feature to have when adding AudioProcessors while
// the AudioDispatcher is running.
audioProcessors = new CopyOnWriteArrayList();
audioInputStream = stream;
format = audioInputStream.getFormat();
setStepSizeAndOverlap(audioBufferSize, bufferOverlap);
audioEvent = new AudioEvent(format);
audioEvent.setFloatBuffer(audioFloatBuffer);
audioEvent.setOverlap(bufferOverlap);
converter = TarsosDSPAudioFloatConverter.getConverter(format);
stopped = false;
bytesToSkip = 0;
zeroPadLastBuffer = true;
}
/**
* Skip a number of seconds before processing the stream.
* @param seconds
*/
public void skip(double seconds){
bytesToSkip = Math.round(seconds * format.getSampleRate()) * format.getFrameSize();
}
/**
* Set a new step size and overlap size. Both in number of samples. Watch
* out with this method: it should be called after a batch of samples is
* processed, not during.
*
* @param audioBufferSize
* The size of the buffer defines how much samples are processed
* in one step. Common values are 1024,2048.
* @param bufferOverlap
* How much consecutive buffers overlap (in samples). Half of the
* AudioBufferSize is common (512, 1024) for an FFT.
*/
public void setStepSizeAndOverlap(final int audioBufferSize, final int bufferOverlap){
audioFloatBuffer = new float[audioBufferSize];
floatOverlap = bufferOverlap;
floatStepSize = audioFloatBuffer.length - floatOverlap;
audioByteBuffer = new byte[audioFloatBuffer.length * format.getFrameSize()];
byteOverlap = floatOverlap * format.getFrameSize();
byteStepSize = floatStepSize * format.getFrameSize();
}
/**
* if zero pad is true then the first buffer is only filled up to buffer size - hop size
* E.g. if the buffer is 2048 and the hop size is 48 then you get 2000x0 and 48 filled audio samples
* @param zeroPadFirstBuffer true if the buffer should be zeroPadFirstBuffer, false otherwise.
*/
public void setZeroPadFirstBuffer(boolean zeroPadFirstBuffer){
this.zeroPadFirstBuffer = zeroPadFirstBuffer;
}
/**
* If zero pad last buffer is true then the last buffer is filled with zeros until the normal amount
* of elements are present in the buffer. Otherwise the buffer only contains the last elements and no zeros.
* By default it is set to true.
*
* @param zeroPadLastBuffer
*/
public void setZeroPadLastBuffer(boolean zeroPadLastBuffer) {
this.zeroPadLastBuffer = zeroPadLastBuffer;
}
/**
* Adds an AudioProcessor to the chain of processors.
*
* @param audioProcessor
* The AudioProcessor to add.
*/
public void addAudioProcessor(final AudioProcessor audioProcessor) {
audioProcessors.add(audioProcessor);
LOG.fine("Added an audioprocessor to the list of processors: " + audioProcessor.toString());
}
/**
* Removes an AudioProcessor to the chain of processors and calls its processingFinished method.
*
* @param audioProcessor
* The AudioProcessor to remove.
*/
public void removeAudioProcessor(final AudioProcessor audioProcessor) {
audioProcessors.remove(audioProcessor);
audioProcessor.processingFinished();
LOG.fine("Remove an audioprocessor to the list of processors: " + audioProcessor.toString());
}
public void run() {
int bytesRead = 0;
if(bytesToSkip!=0){
skipToStart();
}
//Read the first (and in some cases last) audio block.
try {
//needed to get correct time info when skipping first x seconds
audioEvent.setBytesProcessed(bytesProcessed);
bytesRead = readNextAudioBlock();
} catch (IOException e) {
String message="Error while reading audio input stream: " + e.getMessage();
LOG.warning(message);
throw new Error(message);
}
// As long as the stream has not ended
while (bytesRead != 0 && !stopped) {
//Makes sure the right buffers are processed, they can be changed by audio processors.
for (final AudioProcessor processor : audioProcessors) {
if(!processor.process(audioEvent)){
//skip to the next audio processors if false is returned.
break;
}
}
if(!stopped){
//Update the number of bytes processed;
bytesProcessed += bytesRead;
audioEvent.setBytesProcessed(bytesProcessed);
// Read, convert and process consecutive overlapping buffers.
// Slide the buffer.
try {
bytesRead = readNextAudioBlock();
audioEvent.setOverlap(floatOverlap);
} catch (IOException e) {
String message="Error while reading audio input stream: " + e.getMessage();
LOG.warning(message);
throw new Error(message);
}
}
}
// Notify all processors that no more data is available.
// when stop() is called processingFinished is called explicitly, no need to do this again.
// The explicit call is to prevent timing issues.
if(!stopped){
stop();
}
}
private void skipToStart() {
long skipped = 0l;
try{
skipped = audioInputStream.skip(bytesToSkip);
if(skipped !=bytesToSkip){
throw new IOException();
}
bytesProcessed += bytesToSkip;
}catch(IOException e){
String message=String.format("Did not skip the expected amount of bytes, %d skipped, %d expected!", skipped,bytesToSkip);
LOG.warning(message);
throw new Error(message);
}
}
/**
* Stops dispatching audio data.
*/
public void stop() {
stopped = true;
for (final AudioProcessor processor : audioProcessors) {
processor.processingFinished();
}
try {
audioInputStream.close();
} catch (IOException e) {
LOG.log(Level.SEVERE, "Closing audio stream error.", e);
}
}
/**
* Reads the next audio block. It tries to read the number of bytes defined
* by the audio buffer size minus the overlap. If the expected number of
* bytes could not be read either the end of the stream is reached or
* something went wrong.
*
* The behavior for the first and last buffer is defined by their corresponding the zero pad settings. The method also handles the case if
* the first buffer is also the last.
*
* @return The number of bytes read.
* @throws IOException
* When something goes wrong while reading the stream. In
* particular, an IOException is thrown if the input stream has
* been closed.
*/
private int readNextAudioBlock() throws IOException {
assert floatOverlap < audioFloatBuffer.length;
// Is this the first buffer?
boolean isFirstBuffer = (bytesProcessed ==0 || bytesProcessed == bytesToSkip);
final int offsetInBytes;
final int offsetInSamples;
final int bytesToRead;
//Determine the amount of bytes to read from the stream
if(isFirstBuffer && !zeroPadFirstBuffer){
//If this is the first buffer and we do not want to zero pad the
//first buffer then read a full buffer
bytesToRead = audioByteBuffer.length;
// With an offset in bytes of zero;
offsetInBytes = 0;
offsetInSamples=0;
}else{
//In all other cases read the amount of bytes defined by the step size
bytesToRead = byteStepSize;
offsetInBytes = byteOverlap;
offsetInSamples = floatOverlap;
}
//Shift the audio information using array copy since it is probably faster than manually shifting it.
// No need to do this on the first buffer
if(!isFirstBuffer && audioFloatBuffer.length == floatOverlap + floatStepSize ){
System.arraycopy(audioFloatBuffer,floatStepSize, audioFloatBuffer,0 ,floatOverlap);
/*
for(int i = floatStepSize ; i < floatStepSize+floatOverlap ; i++){
audioFloatBuffer[i-floatStepSize] = audioFloatBuffer[i];
}*/
}
// Total amount of bytes read
int totalBytesRead = 0;
// The amount of bytes read from the stream during one iteration.
int bytesRead=0;
// Is the end of the stream reached?
boolean endOfStream = false;
// Always try to read the 'bytesToRead' amount of bytes.
// unless the stream is closed (stopped is true) or no bytes could be read during one iteration
while(!stopped && !endOfStream && totalBytesRead © 2015 - 2024 Weber Informatics LLC | Privacy Policy