core.be.tarsos.dsp.io.PipedAudioStream Maven / Gradle / Ivy
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/*
* _______ _____ _____ _____
* |__ __| | __ \ / ____| __ \
* | | __ _ _ __ ___ ___ ___| | | | (___ | |__) |
* | |/ _` | '__/ __|/ _ \/ __| | | |\___ \| ___/
* | | (_| | | \__ \ (_) \__ \ |__| |____) | |
* |_|\__,_|_| |___/\___/|___/_____/|_____/|_|
*
* -------------------------------------------------------------
*
* 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.io;
import java.io.InputStream;
import be.tarsos.dsp.util.AudioResourceUtils;
/**
* An audio file can be used to convert and read from. It uses libAV to convert
* about any audio format to a one channel PCM stream of a chosen sample rate. There is
* support for movie files as well, the first audio channel is then used as input.
* The resource is either a local file or a type of stream supported by libAV (e.g. HTTP streams);
*
* For a list of audio decoders the following command is practical:
*
avconv -decoders | grep -E "^A" | sort
A... 8svx_exp 8SVX exponential
A... 8svx_fib 8SVX fibonacci
A... aac AAC (Advanced Audio Coding)
A... aac_latm AAC LATM (Advanced Audio Coding LATM syntax)
...
*
*/
public class PipedAudioStream {
//private final static Logger LOG = Logger.getLogger(PipedAudioStream.class.getName());
private final String resource;
private static PipeDecoder pipeDecoder = new PipeDecoder();
public static void setDecoder(PipeDecoder decoder){
pipeDecoder = decoder;
}
private final PipeDecoder decoder;
public PipedAudioStream(String resource){
this.resource = AudioResourceUtils.sanitizeResource(resource);
decoder = pipeDecoder;
}
/**
* Return a one channel, signed PCM stream of audio of a defined sample rate.
* @param targetSampleRate The target sample stream.
* @param startTimeOffset The start time offset.
* @return An audio stream which can be used to read samples from.
*/
public TarsosDSPAudioInputStream getMonoStream(int targetSampleRate,double startTimeOffset){
return getMonoStream(targetSampleRate, startTimeOffset,-1);
}
private TarsosDSPAudioFormat getTargetFormat(int targetSampleRate){
return new TarsosDSPAudioFormat(targetSampleRate, 16, 1, true, false);
}
/**
* Return a one channel, signed PCM stream of audio of a defined sample rate.
* @param targetSampleRate The target sample stream.
* @param startTimeOffset The start time offset.
* @param numberOfSeconds the number of seconds to pipe. If negative the stream is processed until end of stream.
* @return An audio stream which can be used to read samples from.
*/
public TarsosDSPAudioInputStream getMonoStream(int targetSampleRate, double startTimeOffset,
double numberOfSeconds) {
InputStream stream = null;
stream = decoder.getDecodedStream(resource, targetSampleRate,startTimeOffset,numberOfSeconds);
return new UniversalAudioInputStream(stream, getTargetFormat(targetSampleRate));
}
}