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package javax.sound.sampled.spi;
import java.io.InputStream;
import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioInputStream;
/**
* A format conversion provider provides format conversion services
* from one or more input formats to one or more output formats.
* Converters include codecs, which encode and/or decode audio data,
* as well as transcoders, etc. Format converters provide methods for
* determining what conversions are supported and for obtaining an audio
* stream from which converted data can be read.
* <p>
* The source format represents the format of the incoming
* audio data, which will be converted.
* <p>
* The target format represents the format of the processed, converted
* audio data. This is the format of the data that can be read from
* the stream returned by one of the <code>getAudioInputStream</code> methods.
*
* @author Kara Kytle
* @since 1.3
*/
public abstract class FormatConversionProvider {
// NEW METHODS
/**
* Obtains the set of source format encodings from which format
* conversion services are provided by this provider.
* @return array of source format encodings. The array will always
* have a length of at least 1.
*/
public abstract AudioFormat.Encoding[] getSourceEncodings();
/**
* Obtains the set of target format encodings to which format
* conversion services are provided by this provider.
* @return array of target format encodings. The array will always
* have a length of at least 1.
*/
public abstract AudioFormat.Encoding[] getTargetEncodings();
/**
* Indicates whether the format converter supports conversion from the
* specified source format encoding.
* @param sourceEncoding the source format encoding for which support is queried
* @return <code>true</code> if the encoding is supported, otherwise <code>false</code>
*/
public boolean isSourceEncodingSupported(AudioFormat.Encoding sourceEncoding){
AudioFormat.Encoding sourceEncodings[] = getSourceEncodings();
for(int i=0; i<sourceEncodings.length; i++) {
if( sourceEncoding.equals( sourceEncodings[i]) ) {
return true;
}
}
return false;
}
/**
* Indicates whether the format converter supports conversion to the
* specified target format encoding.
* @param targetEncoding the target format encoding for which support is queried
* @return <code>true</code> if the encoding is supported, otherwise <code>false</code>
*/
public boolean isTargetEncodingSupported(AudioFormat.Encoding targetEncoding){
AudioFormat.Encoding targetEncodings[] = getTargetEncodings();
for(int i=0; i<targetEncodings.length; i++) {
if( targetEncoding.equals( targetEncodings[i]) ) {
return true;
}
}
return false;
}
/**
* Obtains the set of target format encodings supported by the format converter
* given a particular source format.
* If no target format encodings are supported for this source format,
* an array of length 0 is returned.
* @return array of supported target format encodings.
*/
public abstract AudioFormat.Encoding[] getTargetEncodings(AudioFormat sourceFormat);
/**
* Indicates whether the format converter supports conversion to a particular encoding
* from a particular format.
* @param targetEncoding desired encoding of the outgoing data
* @param sourceFormat format of the incoming data
* @return <code>true</code> if the conversion is supported, otherwise <code>false</code>
*/
public boolean isConversionSupported(AudioFormat.Encoding targetEncoding, AudioFormat sourceFormat){
AudioFormat.Encoding targetEncodings[] = getTargetEncodings(sourceFormat);
for(int i=0; i<targetEncodings.length; i++) {
if( targetEncoding.equals( targetEncodings[i]) ) {
return true;
}
}
return false;
}
/**
* Obtains the set of target formats with the encoding specified
* supported by the format converter
* If no target formats with the specified encoding are supported
* for this source format, an array of length 0 is returned.
* @return array of supported target formats.
*/
public abstract AudioFormat[] getTargetFormats(AudioFormat.Encoding targetEncoding, AudioFormat sourceFormat);
/**
* Indicates whether the format converter supports conversion to one
* particular format from another.
* @param targetFormat desired format of outgoing data
* @param sourceFormat format of the incoming data
* @return <code>true</code> if the conversion is supported, otherwise <code>false</code>
*/
public boolean isConversionSupported(AudioFormat targetFormat, AudioFormat sourceFormat){
AudioFormat targetFormats[] = getTargetFormats( targetFormat.getEncoding(), sourceFormat );
for(int i=0; i<targetFormats.length; i++) {
if( targetFormat.matches( targetFormats[i] ) ) {
return true;
}
}
return false;
}
/**
* Obtains an audio input stream with the specified encoding from the given audio
* input stream.
* @param targetEncoding desired encoding of the stream after processing
* @param sourceStream stream from which data to be processed should be read
* @return stream from which processed data with the specified target encoding may be read
* @throws IllegalArgumentException if the format combination supplied is
* not supported.
*/
public abstract AudioInputStream getAudioInputStream(AudioFormat.Encoding targetEncoding, AudioInputStream sourceStream);
/**
* Obtains an audio input stream with the specified format from the given audio
* input stream.
* @param targetFormat desired data format of the stream after processing
* @param sourceStream stream from which data to be processed should be read
* @return stream from which processed data with the specified format may be read
* @throws IllegalArgumentException if the format combination supplied is
* not supported.
*/
public abstract AudioInputStream getAudioInputStream(AudioFormat targetFormat, AudioInputStream sourceStream);
}