JDK8/Java8源码在线阅读
/*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
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*
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* accompanied this code).
*
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*
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package javax.sound.sampled;
import java.io.File;
import java.io.InputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.URL;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.Vector;
import java.util.ArrayList;
import javax.sound.sampled.spi.AudioFileWriter;
import javax.sound.sampled.spi.AudioFileReader;
import javax.sound.sampled.spi.FormatConversionProvider;
import javax.sound.sampled.spi.MixerProvider;
import com.sun.media.sound.JDK13Services;
/* $fb TODO:
* - consistent usage of (typed) collections
*/
/**
* The <code>AudioSystem</code> class acts as the entry point to the
* sampled-audio system resources. This class lets you query and
* access the mixers that are installed on the system.
* <code>AudioSystem</code> includes a number of
* methods for converting audio data between different formats, and for
* translating between audio files and streams. It also provides a method
* for obtaining a <code>{@link Line}</code> directly from the
* <code>AudioSystem</code> without dealing explicitly
* with mixers.
*
* <p>Properties can be used to specify the default mixer
* for specific line types.
* Both system properties and a properties file are considered.
* The <code>sound.properties</code> properties file is read from
* an implementation-specific location (typically it is the <code>lib</code>
* directory in the Java installation directory).
* If a property exists both as a system property and in the
* properties file, the system property takes precedence. If none is
* specified, a suitable default is chosen among the available devices.
* The syntax of the properties file is specified in
* {@link java.util.Properties#load(InputStream) Properties.load}. The
* following table lists the available property keys and which methods
* consider them:
*
* <table border=0>
* <caption>Audio System Property Keys</caption>
* <tr>
* <th>Property Key</th>
* <th>Interface</th>
* <th>Affected Method(s)</th>
* </tr>
* <tr>
* <td><code>javax.sound.sampled.Clip</code></td>
* <td>{@link Clip}</td>
* <td>{@link #getLine}, {@link #getClip}</td>
* </tr>
* <tr>
* <td><code>javax.sound.sampled.Port</code></td>
* <td>{@link Port}</td>
* <td>{@link #getLine}</td>
* </tr>
* <tr>
* <td><code>javax.sound.sampled.SourceDataLine</code></td>
* <td>{@link SourceDataLine}</td>
* <td>{@link #getLine}, {@link #getSourceDataLine}</td>
* </tr>
* <tr>
* <td><code>javax.sound.sampled.TargetDataLine</code></td>
* <td>{@link TargetDataLine}</td>
* <td>{@link #getLine}, {@link #getTargetDataLine}</td>
* </tr>
* </table>
*
* The property value consists of the provider class name
* and the mixer name, separated by the hash mark ("#").
* The provider class name is the fully-qualified
* name of a concrete {@link javax.sound.sampled.spi.MixerProvider
* mixer provider} class. The mixer name is matched against
* the <code>String</code> returned by the <code>getName</code>
* method of <code>Mixer.Info</code>.
* Either the class name, or the mixer name may be omitted.
* If only the class name is specified, the trailing hash mark
* is optional.
*
* <p>If the provider class is specified, and it can be
* successfully retrieved from the installed providers, the list of
* <code>Mixer.Info</code> objects is retrieved
* from the provider. Otherwise, or when these mixers
* do not provide a subsequent match, the list is retrieved
* from {@link #getMixerInfo} to contain
* all available <code>Mixer.Info</code> objects.
*
* <p>If a mixer name is specified, the resulting list of
* <code>Mixer.Info</code> objects is searched:
* the first one with a matching name, and whose
* <code>Mixer</code> provides the
* respective line interface, will be returned.
* If no matching <code>Mixer.Info</code> object
* is found, or the mixer name is not specified,
* the first mixer from the resulting
* list, which provides the respective line
* interface, will be returned.
*
* For example, the property <code>javax.sound.sampled.Clip</code>
* with a value
* <code>"com.sun.media.sound.MixerProvider#SunClip"</code>
* will have the following consequences when
* <code>getLine</code> is called requesting a <code>Clip</code>
* instance:
* if the class <code>com.sun.media.sound.MixerProvider</code> exists
* in the list of installed mixer providers,
* the first <code>Clip</code> from the first mixer with name
* <code>"SunClip"</code> will be returned. If it cannot
* be found, the first <code>Clip</code> from the first mixer
* of the specified provider will be returned, regardless of name.
* If there is none, the first <code>Clip</code> from the first
* <code>Mixer</code> with name
* <code>"SunClip"</code> in the list of all mixers
* (as returned by <code>getMixerInfo</code>) will be returned,
* or, if not found, the first <code>Clip</code> of the first
* <code>Mixer</code>that can be found in the list of all
* mixers is returned.
* If that fails, too, an <code>IllegalArgumentException</code>
* is thrown.
*
* @author Kara Kytle
* @author Florian Bomers
* @author Matthias Pfisterer
* @author Kevin P. Smith
*
* @see AudioFormat
* @see AudioInputStream
* @see Mixer
* @see Line
* @see Line.Info
* @since 1.3
*/
public class AudioSystem {
/**
* An integer that stands for an unknown numeric value.
* This value is appropriate only for signed quantities that do not
* normally take negative values. Examples include file sizes, frame
* sizes, buffer sizes, and sample rates.
* A number of Java Sound constructors accept
* a value of <code>NOT_SPECIFIED</code> for such parameters. Other
* methods may also accept or return this value, as documented.
*/
public static final int NOT_SPECIFIED = -1;
/**
* Private no-args constructor for ensuring against instantiation.
*/
private AudioSystem() {
}
/**
* Obtains an array of mixer info objects that represents
* the set of audio mixers that are currently installed on the system.
* @return an array of info objects for the currently installed mixers. If no mixers
* are available on the system, an array of length 0 is returned.
* @see #getMixer
*/
public static Mixer.Info[] getMixerInfo() {
List infos = getMixerInfoList();
Mixer.Info[] allInfos = (Mixer.Info[]) infos.toArray(new Mixer.Info[infos.size()]);
return allInfos;
}
/**
* Obtains the requested audio mixer.
* @param info a <code>Mixer.Info</code> object representing the desired
* mixer, or <code>null</code> for the system default mixer
* @return the requested mixer
* @throws SecurityException if the requested mixer
* is unavailable because of security restrictions
* @throws IllegalArgumentException if the info object does not represent
* a mixer installed on the system
* @see #getMixerInfo
*/
public static Mixer getMixer(Mixer.Info info) {
Mixer mixer = null;
List providers = getMixerProviders();
for(int i = 0; i < providers.size(); i++ ) {
try {
return ((MixerProvider)providers.get(i)).getMixer(info);
} catch (IllegalArgumentException e) {
} catch (NullPointerException e) {
// $$jb 08.20.99: If the strings in the info object aren't
// set, then Netscape (using jdk1.1.5) tends to throw
// NPE's when doing some string manipulation. This is
// probably not the best fix, but is solves the problem
// of the NPE in Netscape using local classes
// $$jb 11.01.99: Replacing this patch.
}
}
//$$fb if looking for default mixer, and not found yet, add a round of looking
if (info == null) {
for(int i = 0; i < providers.size(); i++ ) {
try {
MixerProvider provider = (MixerProvider) providers.get(i);
Mixer.Info[] infos = provider.getMixerInfo();
// start from 0 to last device (do not reverse this order)
for (int ii = 0; ii < infos.length; ii++) {
try {
return provider.getMixer(infos[ii]);
} catch (IllegalArgumentException e) {
// this is not a good default device :)
}
}
} catch (IllegalArgumentException e) {
} catch (NullPointerException e) {
}
}
}
throw new IllegalArgumentException("Mixer not supported: "
+ (info!=null?info.toString():"null"));
}
//$$fb 2002-11-26: fix for 4757930: DOC: AudioSystem.getTarget/SourceLineInfo() is ambiguous
/**
* Obtains information about all source lines of a particular type that are supported
* by the installed mixers.
* @param info a <code>Line.Info</code> object that specifies the kind of
* lines about which information is requested
* @return an array of <code>Line.Info</code> objects describing source lines matching
* the type requested. If no matching source lines are supported, an array of length 0
* is returned.
*
* @see Mixer#getSourceLineInfo(Line.Info)
*/
public static Line.Info[] getSourceLineInfo(Line.Info info) {
Vector vector = new Vector();
Line.Info[] currentInfoArray;
Mixer mixer;
Line.Info fullInfo = null;
Mixer.Info[] infoArray = getMixerInfo();
for (int i = 0; i < infoArray.length; i++) {
mixer = getMixer(infoArray[i]);
currentInfoArray = mixer.getSourceLineInfo(info);
for (int j = 0; j < currentInfoArray.length; j++) {
vector.addElement(currentInfoArray[j]);
}
}
Line.Info[] returnedArray = new Line.Info[vector.size()];
for (int i = 0; i < returnedArray.length; i++) {
returnedArray[i] = (Line.Info)vector.get(i);
}
return returnedArray;
}
/**
* Obtains information about all target lines of a particular type that are supported
* by the installed mixers.
* @param info a <code>Line.Info</code> object that specifies the kind of
* lines about which information is requested
* @return an array of <code>Line.Info</code> objects describing target lines matching
* the type requested. If no matching target lines are supported, an array of length 0
* is returned.
*
* @see Mixer#getTargetLineInfo(Line.Info)
*/
public static Line.Info[] getTargetLineInfo(Line.Info info) {
Vector vector = new Vector();
Line.Info[] currentInfoArray;
Mixer mixer;
Line.Info fullInfo = null;
Mixer.Info[] infoArray = getMixerInfo();
for (int i = 0; i < infoArray.length; i++) {
mixer = getMixer(infoArray[i]);
currentInfoArray = mixer.getTargetLineInfo(info);
for (int j = 0; j < currentInfoArray.length; j++) {
vector.addElement(currentInfoArray[j]);
}
}
Line.Info[] returnedArray = new Line.Info[vector.size()];
for (int i = 0; i < returnedArray.length; i++) {
returnedArray[i] = (Line.Info)vector.get(i);
}
return returnedArray;
}
/**
* Indicates whether the system supports any lines that match
* the specified <code>Line.Info</code> object. A line is supported if
* any installed mixer supports it.
* @param info a <code>Line.Info</code> object describing the line for which support is queried
* @return <code>true</code> if at least one matching line is
* supported, otherwise <code>false</code>
*
* @see Mixer#isLineSupported(Line.Info)
*/
public static boolean isLineSupported(Line.Info info) {
Mixer mixer;
Mixer.Info[] infoArray = getMixerInfo();
for (int i = 0; i < infoArray.length; i++) {
if( infoArray[i] != null ) {
mixer = getMixer(infoArray[i]);
if (mixer.isLineSupported(info)) {
return true;
}
}
}
return false;
}
/**
* Obtains a line that matches the description in the specified
* <code>Line.Info</code> object.
*
* <p>If a <code>DataLine</code> is requested, and <code>info</code>
* is an instance of <code>DataLine.Info</code> specifying at least
* one fully qualified audio format, the last one
* will be used as the default format of the returned
* <code>DataLine</code>.
*
* <p>If system properties
* <code>javax.sound.sampled.Clip</code>,
* <code>javax.sound.sampled.Port</code>,
* <code>javax.sound.sampled.SourceDataLine</code> and
* <code>javax.sound.sampled.TargetDataLine</code> are defined
* or they are defined in the file "sound.properties",
* they are used to retrieve default lines.
* For details, refer to the {@link AudioSystem class description}.
*
* If the respective property is not set, or the mixer
* requested in the property is not installed or does not provide the
* requested line, all installed mixers are queried for the
* requested line type. A Line will be returned from the first mixer
* providing the requested line type.
*
* @param info a <code>Line.Info</code> object describing the desired kind of line
* @return a line of the requested kind
*
* @throws LineUnavailableException if a matching line
* is not available due to resource restrictions
* @throws SecurityException if a matching line
* is not available due to security restrictions
* @throws IllegalArgumentException if the system does not
* support at least one line matching the specified
* <code>Line.Info</code> object
* through any installed mixer
*/
public static Line getLine(Line.Info info) throws LineUnavailableException {
LineUnavailableException lue = null;
List providers = getMixerProviders();
// 1: try from default mixer for this line class
try {
Mixer mixer = getDefaultMixer(providers, info);
if (mixer != null && mixer.isLineSupported(info)) {
return mixer.getLine(info);
}
} catch (LineUnavailableException e) {
lue = e;
} catch (IllegalArgumentException iae) {
// must not happen... but better to catch it here,
// if plug-ins are badly written
}
// 2: if that doesn't work, try to find any mixing mixer
for(int i = 0; i < providers.size(); i++) {
MixerProvider provider = (MixerProvider) providers.get(i);
Mixer.Info[] infos = provider.getMixerInfo();
for (int j = 0; j < infos.length; j++) {
try {
Mixer mixer = provider.getMixer(infos[j]);
// see if this is an appropriate mixer which can mix
if (isAppropriateMixer(mixer, info, true)) {
return mixer.getLine(info);
}
} catch (LineUnavailableException e) {
lue = e;
} catch (IllegalArgumentException iae) {
// must not happen... but better to catch it here,
// if plug-ins are badly written
}
}
}
// 3: if that didn't work, try to find any non-mixing mixer
for(int i = 0; i < providers.size(); i++) {
MixerProvider provider = (MixerProvider) providers.get(i);
Mixer.Info[] infos = provider.getMixerInfo();
for (int j = 0; j < infos.length; j++) {
try {
Mixer mixer = provider.getMixer(infos[j]);
// see if this is an appropriate mixer which can mix
if (isAppropriateMixer(mixer, info, false)) {
return mixer.getLine(info);
}
} catch (LineUnavailableException e) {
lue = e;
} catch (IllegalArgumentException iae) {
// must not happen... but better to catch it here,
// if plug-ins are badly written
}
}
}
// if this line was supported but was not available, throw the last
// LineUnavailableException we got (??).
if (lue != null) {
throw lue;
}
// otherwise, the requested line was not supported, so throw
// an Illegal argument exception
throw new IllegalArgumentException("No line matching " +
info.toString() + " is supported.");
}
/**
* Obtains a clip that can be used for playing back
* an audio file or an audio stream. The returned clip
* will be provided by the default system mixer, or,
* if not possible, by any other mixer installed in the
* system that supports a <code>Clip</code>
* object.
*
* <p>The returned clip must be opened with the
* <code>open(AudioFormat)</code> or
* <code>open(AudioInputStream)</code> method.
*
* <p>This is a high-level method that uses <code>getMixer</code>
* and <code>getLine</code> internally.
*
* <p>If the system property
* <code>javax.sound.sampled.Clip</code>
* is defined or it is defined in the file "sound.properties",
* it is used to retrieve the default clip.
* For details, refer to the {@link AudioSystem class description}.
*
* @return the desired clip object
*
* @throws LineUnavailableException if a clip object
* is not available due to resource restrictions
* @throws SecurityException if a clip object
* is not available due to security restrictions
* @throws IllegalArgumentException if the system does not
* support at least one clip instance through any installed mixer
*
* @see #getClip(Mixer.Info)
* @since 1.5
*/
public static Clip getClip() throws LineUnavailableException{
AudioFormat format = new AudioFormat(AudioFormat.Encoding.PCM_SIGNED,
AudioSystem.NOT_SPECIFIED,
16, 2, 4,
AudioSystem.NOT_SPECIFIED, true);
DataLine.Info info = new DataLine.Info(Clip.class, format);
return (Clip) AudioSystem.getLine(info);
}
/**
* Obtains a clip from the specified mixer that can be
* used for playing back an audio file or an audio stream.
*
* <p>The returned clip must be opened with the
* <code>open(AudioFormat)</code> or
* <code>open(AudioInputStream)</code> method.
*
* <p>This is a high-level method that uses <code>getMixer</code>
* and <code>getLine</code> internally.
*
* @param mixerInfo a <code>Mixer.Info</code> object representing the
* desired mixer, or <code>null</code> for the system default mixer
* @return a clip object from the specified mixer
*
* @throws LineUnavailableException if a clip
* is not available from this mixer due to resource restrictions
* @throws SecurityException if a clip
* is not available from this mixer due to security restrictions
* @throws IllegalArgumentException if the system does not
* support at least one clip through the specified mixer
*
* @see #getClip()
* @since 1.5
*/
public static Clip getClip(Mixer.Info mixerInfo) throws LineUnavailableException{
AudioFormat format = new AudioFormat(AudioFormat.Encoding.PCM_SIGNED,
AudioSystem.NOT_SPECIFIED,
16, 2, 4,
AudioSystem.NOT_SPECIFIED, true);
DataLine.Info info = new DataLine.Info(Clip.class, format);
Mixer mixer = AudioSystem.getMixer(mixerInfo);
return (Clip) mixer.getLine(info);
}
/**
* Obtains a source data line that can be used for playing back
* audio data in the format specified by the
* <code>AudioFormat</code> object. The returned line
* will be provided by the default system mixer, or,
* if not possible, by any other mixer installed in the
* system that supports a matching
* <code>SourceDataLine</code> object.
*
* <p>The returned line should be opened with the
* <code>open(AudioFormat)</code> or
* <code>open(AudioFormat, int)</code> method.
*
* <p>This is a high-level method that uses <code>getMixer</code>
* and <code>getLine</code> internally.
*
* <p>The returned <code>SourceDataLine</code>'s default
* audio format will be initialized with <code>format</code>.
*
* <p>If the system property
* <code>javax.sound.sampled.SourceDataLine</code>
* is defined or it is defined in the file "sound.properties",
* it is used to retrieve the default source data line.
* For details, refer to the {@link AudioSystem class description}.
*
* @param format an <code>AudioFormat</code> object specifying
* the supported audio format of the returned line,
* or <code>null</code> for any audio format
* @return the desired <code>SourceDataLine</code> object
*
* @throws LineUnavailableException if a matching source data line
* is not available due to resource restrictions
* @throws SecurityException if a matching source data line
* is not available due to security restrictions
* @throws IllegalArgumentException if the system does not
* support at least one source data line supporting the
* specified audio format through any installed mixer
*
* @see #getSourceDataLine(AudioFormat, Mixer.Info)
* @since 1.5
*/
public static SourceDataLine getSourceDataLine(AudioFormat format)
throws LineUnavailableException{
DataLine.Info info = new DataLine.Info(SourceDataLine.class, format);
return (SourceDataLine) AudioSystem.getLine(info);
}
/**
* Obtains a source data line that can be used for playing back
* audio data in the format specified by the
* <code>AudioFormat</code> object, provided by the mixer
* specified by the <code>Mixer.Info</code> object.
*
* <p>The returned line should be opened with the
* <code>open(AudioFormat)</code> or
* <code>open(AudioFormat, int)</code> method.
*
* <p>This is a high-level method that uses <code>getMixer</code>
* and <code>getLine</code> internally.
*
* <p>The returned <code>SourceDataLine</code>'s default
* audio format will be initialized with <code>format</code>.
*
* @param format an <code>AudioFormat</code> object specifying
* the supported audio format of the returned line,
* or <code>null</code> for any audio format
* @param mixerinfo a <code>Mixer.Info</code> object representing
* the desired mixer, or <code>null</code> for the system
* default mixer
* @return the desired <code>SourceDataLine</code> object
*
* @throws LineUnavailableException if a matching source data
* line is not available from the specified mixer due
* to resource restrictions
* @throws SecurityException if a matching source data line
* is not available from the specified mixer due to
* security restrictions
* @throws IllegalArgumentException if the specified mixer does
* not support at least one source data line supporting
* the specified audio format
*
* @see #getSourceDataLine(AudioFormat)
* @since 1.5
*/
public static SourceDataLine getSourceDataLine(AudioFormat format,
Mixer.Info mixerinfo)
throws LineUnavailableException{
DataLine.Info info = new DataLine.Info(SourceDataLine.class, format);
Mixer mixer = AudioSystem.getMixer(mixerinfo);
return (SourceDataLine) mixer.getLine(info);
}
/**
* Obtains a target data line that can be used for recording
* audio data in the format specified by the
* <code>AudioFormat</code> object. The returned line
* will be provided by the default system mixer, or,
* if not possible, by any other mixer installed in the
* system that supports a matching
* <code>TargetDataLine</code> object.
*
* <p>The returned line should be opened with the
* <code>open(AudioFormat)</code> or
* <code>open(AudioFormat, int)</code> method.
*
* <p>This is a high-level method that uses <code>getMixer</code>
* and <code>getLine</code> internally.
*
* <p>The returned <code>TargetDataLine</code>'s default
* audio format will be initialized with <code>format</code>.
*
* <p>If the system property
* {@code javax.sound.sampled.TargetDataLine}
* is defined or it is defined in the file "sound.properties",
* it is used to retrieve the default target data line.
* For details, refer to the {@link AudioSystem class description}.
*
* @param format an <code>AudioFormat</code> object specifying
* the supported audio format of the returned line,
* or <code>null</code> for any audio format
* @return the desired <code>TargetDataLine</code> object
*
* @throws LineUnavailableException if a matching target data line
* is not available due to resource restrictions
* @throws SecurityException if a matching target data line
* is not available due to security restrictions
* @throws IllegalArgumentException if the system does not
* support at least one target data line supporting the
* specified audio format through any installed mixer
*
* @see #getTargetDataLine(AudioFormat, Mixer.Info)
* @see AudioPermission
* @since 1.5
*/
public static TargetDataLine getTargetDataLine(AudioFormat format)
throws LineUnavailableException{
DataLine.Info info = new DataLine.Info(TargetDataLine.class, format);
return (TargetDataLine) AudioSystem.getLine(info);
}
/**
* Obtains a target data line that can be used for recording
* audio data in the format specified by the
* <code>AudioFormat</code> object, provided by the mixer
* specified by the <code>Mixer.Info</code> object.
*
* <p>The returned line should be opened with the
* <code>open(AudioFormat)</code> or
* <code>open(AudioFormat, int)</code> method.
*
* <p>This is a high-level method that uses <code>getMixer</code>
* and <code>getLine</code> internally.
*
* <p>The returned <code>TargetDataLine</code>'s default
* audio format will be initialized with <code>format</code>.
*
* @param format an <code>AudioFormat</code> object specifying
* the supported audio format of the returned line,
* or <code>null</code> for any audio format
* @param mixerinfo a <code>Mixer.Info</code> object representing the
* desired mixer, or <code>null</code> for the system default mixer
* @return the desired <code>TargetDataLine</code> object
*
* @throws LineUnavailableException if a matching target data
* line is not available from the specified mixer due
* to resource restrictions
* @throws SecurityException if a matching target data line
* is not available from the specified mixer due to
* security restrictions
* @throws IllegalArgumentException if the specified mixer does
* not support at least one target data line supporting
* the specified audio format
*
* @see #getTargetDataLine(AudioFormat)
* @see AudioPermission
* @since 1.5
*/
public static TargetDataLine getTargetDataLine(AudioFormat format,
Mixer.Info mixerinfo)
throws LineUnavailableException {
DataLine.Info info = new DataLine.Info(TargetDataLine.class, format);
Mixer mixer = AudioSystem.getMixer(mixerinfo);
return (TargetDataLine) mixer.getLine(info);
}
// $$fb 2002-04-12: fix for 4662082: behavior of AudioSystem.getTargetEncodings() methods doesn't match the spec
/**
* Obtains the encodings that the system can obtain from an
* audio input stream with the specified encoding using the set
* of installed format converters.
* @param sourceEncoding the encoding for which conversion support
* is queried
* @return array of encodings. If <code>sourceEncoding</code>is not supported,
* an array of length 0 is returned. Otherwise, the array will have a length
* of at least 1, representing <code>sourceEncoding</code> (no conversion).
*/
public static AudioFormat.Encoding[] getTargetEncodings(AudioFormat.Encoding sourceEncoding) {
List codecs = getFormatConversionProviders();
Vector encodings = new Vector();
AudioFormat.Encoding encs[] = null;
// gather from all the codecs
for(int i=0; i<codecs.size(); i++ ) {
FormatConversionProvider codec = (FormatConversionProvider) codecs.get(i);
if( codec.isSourceEncodingSupported( sourceEncoding ) ) {
encs = codec.getTargetEncodings();
for (int j = 0; j < encs.length; j++) {
encodings.addElement( encs[j] );
}
}
}
AudioFormat.Encoding encs2[] = (AudioFormat.Encoding[]) encodings.toArray(new AudioFormat.Encoding[0]);
return encs2;
}
// $$fb 2002-04-12: fix for 4662082: behavior of AudioSystem.getTargetEncodings() methods doesn't match the spec
/**
* Obtains the encodings that the system can obtain from an
* audio input stream with the specified format using the set
* of installed format converters.
* @param sourceFormat the audio format for which conversion
* is queried
* @return array of encodings. If <code>sourceFormat</code>is not supported,
* an array of length 0 is returned. Otherwise, the array will have a length
* of at least 1, representing the encoding of <code>sourceFormat</code> (no conversion).
*/
public static AudioFormat.Encoding[] getTargetEncodings(AudioFormat sourceFormat) {
List codecs = getFormatConversionProviders();
Vector encodings = new Vector();
int size = 0;
int index = 0;
AudioFormat.Encoding encs[] = null;
// gather from all the codecs
for(int i=0; i<codecs.size(); i++ ) {
encs = ((FormatConversionProvider) codecs.get(i)).getTargetEncodings(sourceFormat);
size += encs.length;
encodings.addElement( encs );
}
// now build a new array
AudioFormat.Encoding encs2[] = new AudioFormat.Encoding[size];
for(int i=0; i<encodings.size(); i++ ) {
encs = (AudioFormat.Encoding [])(encodings.get(i));
for(int j=0; j<encs.length; j++ ) {
encs2[index++] = encs[j];
}
}
return encs2;
}
/**
* Indicates whether an audio input stream of the specified encoding
* can be obtained from an audio input stream that has the specified
* format.
* @param targetEncoding the desired encoding after conversion
* @param sourceFormat the audio format before conversion
* @return <code>true</code> if the conversion is supported,
* otherwise <code>false</code>
*/
public static boolean isConversionSupported(AudioFormat.Encoding targetEncoding, AudioFormat sourceFormat) {
List codecs = getFormatConversionProviders();
for(int i=0; i<codecs.size(); i++ ) {
FormatConversionProvider codec = (FormatConversionProvider) codecs.get(i);
if(codec.isConversionSupported(targetEncoding,sourceFormat) ) {
return true;
}
}
return false;
}
/**
* Obtains an audio input stream of the indicated encoding, by converting the
* provided audio input stream.
* @param targetEncoding the desired encoding after conversion
* @param sourceStream the stream to be converted
* @return an audio input stream of the indicated encoding
* @throws IllegalArgumentException if the conversion is not supported
* @see #getTargetEncodings(AudioFormat.Encoding)
* @see #getTargetEncodings(AudioFormat)
* @see #isConversionSupported(AudioFormat.Encoding, AudioFormat)
* @see #getAudioInputStream(AudioFormat, AudioInputStream)
*/
public static AudioInputStream getAudioInputStream(AudioFormat.Encoding targetEncoding,
AudioInputStream sourceStream) {
List codecs = getFormatConversionProviders();
for(int i = 0; i < codecs.size(); i++) {
FormatConversionProvider codec = (FormatConversionProvider) codecs.get(i);
if( codec.isConversionSupported( targetEncoding, sourceStream.getFormat() ) ) {
return codec.getAudioInputStream( targetEncoding, sourceStream );
}
}
// we ran out of options, throw an exception
throw new IllegalArgumentException("Unsupported conversion: " + targetEncoding + " from " + sourceStream.getFormat());
}
/**
* Obtains the formats that have a particular encoding and that the system can
* obtain from a stream of the specified format using the set of
* installed format converters.
* @param targetEncoding the desired encoding after conversion
* @param sourceFormat the audio format before conversion
* @return array of formats. If no formats of the specified
* encoding are supported, an array of length 0 is returned.
*/
public static AudioFormat[] getTargetFormats(AudioFormat.Encoding targetEncoding, AudioFormat sourceFormat) {
List codecs = getFormatConversionProviders();
Vector formats = new Vector();
int size = 0;
int index = 0;
AudioFormat fmts[] = null;
// gather from all the codecs
for(int i=0; i<codecs.size(); i++ ) {
FormatConversionProvider codec = (FormatConversionProvider) codecs.get(i);
fmts = codec.getTargetFormats(targetEncoding, sourceFormat);
size += fmts.length;
formats.addElement( fmts );
}
// now build a new array
AudioFormat fmts2[] = new AudioFormat[size];
for(int i=0; i<formats.size(); i++ ) {
fmts = (AudioFormat [])(formats.get(i));
for(int j=0; j<fmts.length; j++ ) {
fmts2[index++] = fmts[j];
}
}
return fmts2;
}
/**
* Indicates whether an audio input stream of a specified format
* can be obtained from an audio input stream of another specified format.
* @param targetFormat the desired audio format after conversion
* @param sourceFormat the audio format before conversion
* @return <code>true</code> if the conversion is supported,
* otherwise <code>false</code>
*/
public static boolean isConversionSupported(AudioFormat targetFormat, AudioFormat sourceFormat) {
List codecs = getFormatConversionProviders();
for(int i=0; i<codecs.size(); i++ ) {
FormatConversionProvider codec = (FormatConversionProvider) codecs.get(i);
if(codec.isConversionSupported(targetFormat, sourceFormat) ) {
return true;
}
}
return false;
}
/**
* Obtains an audio input stream of the indicated format, by converting the
* provided audio input stream.
* @param targetFormat the desired audio format after conversion
* @param sourceStream the stream to be converted
* @return an audio input stream of the indicated format
* @throws IllegalArgumentException if the conversion is not supported
* #see #getTargetEncodings(AudioFormat)
* @see #getTargetFormats(AudioFormat.Encoding, AudioFormat)
* @see #isConversionSupported(AudioFormat, AudioFormat)
* @see #getAudioInputStream(AudioFormat.Encoding, AudioInputStream)
*/
public static AudioInputStream getAudioInputStream(AudioFormat targetFormat,
AudioInputStream sourceStream) {
if (sourceStream.getFormat().matches(targetFormat)) {
return sourceStream;
}
List codecs = getFormatConversionProviders();
for(int i = 0; i < codecs.size(); i++) {
FormatConversionProvider codec = (FormatConversionProvider) codecs.get(i);
if(codec.isConversionSupported(targetFormat,sourceStream.getFormat()) ) {
return codec.getAudioInputStream(targetFormat,sourceStream);
}
}
// we ran out of options...
throw new IllegalArgumentException("Unsupported conversion: " + targetFormat + " from " + sourceStream.getFormat());
}
/**
* Obtains the audio file format of the provided input stream. The stream must
* point to valid audio file data. The implementation of this method may require
* multiple parsers to examine the stream to determine whether they support it.
* These parsers must be able to mark the stream, read enough data to determine whether they
* support the stream, and, if not, reset the stream's read pointer to its original
* position. If the input stream does not support these operations, this method may fail
* with an <code>IOException</code>.
* @param stream the input stream from which file format information should be
* extracted
* @return an <code>AudioFileFormat</code> object describing the stream's audio file format
* @throws UnsupportedAudioFileException if the stream does not point to valid audio
* file data recognized by the system
* @throws IOException if an input/output exception occurs
* @see InputStream#markSupported
* @see InputStream#mark
*/
public static AudioFileFormat getAudioFileFormat(InputStream stream)
throws UnsupportedAudioFileException, IOException {
List providers = getAudioFileReaders();
AudioFileFormat format = null;
for(int i = 0; i < providers.size(); i++ ) {
AudioFileReader reader = (AudioFileReader) providers.get(i);
try {
format = reader.getAudioFileFormat( stream ); // throws IOException
break;
} catch (UnsupportedAudioFileException e) {
continue;
}
}
if( format==null ) {
throw new UnsupportedAudioFileException("file is not a supported file type");
} else {
return format;
}
}
/**
* Obtains the audio file format of the specified URL. The URL must
* point to valid audio file data.
* @param url the URL from which file format information should be
* extracted
* @return an <code>AudioFileFormat</code> object describing the audio file format
* @throws UnsupportedAudioFileException if the URL does not point to valid audio
* file data recognized by the system
* @throws IOException if an input/output exception occurs
*/
public static AudioFileFormat getAudioFileFormat(URL url)
throws UnsupportedAudioFileException, IOException {
List providers = getAudioFileReaders();
AudioFileFormat format = null;
for(int i = 0; i < providers.size(); i++ ) {
AudioFileReader reader = (AudioFileReader) providers.get(i);
try {
format = reader.getAudioFileFormat( url ); // throws IOException
break;
} catch (UnsupportedAudioFileException e) {
continue;
}
}
if( format==null ) {
throw new UnsupportedAudioFileException("file is not a supported file type");
} else {
return format;
}
}
/**
* Obtains the audio file format of the specified <code>File</code>. The <code>File</code> must
* point to valid audio file data.
* @param file the <code>File</code> from which file format information should be
* extracted
* @return an <code>AudioFileFormat</code> object describing the audio file format
* @throws UnsupportedAudioFileException if the <code>File</code> does not point to valid audio
* file data recognized by the system
* @throws IOException if an I/O exception occurs
*/
public static AudioFileFormat getAudioFileFormat(File file)
throws UnsupportedAudioFileException, IOException {
List providers = getAudioFileReaders();
AudioFileFormat format = null;
for(int i = 0; i < providers.size(); i++ ) {
AudioFileReader reader = (AudioFileReader) providers.get(i);
try {
format = reader.getAudioFileFormat( file ); // throws IOException
break;
} catch (UnsupportedAudioFileException e) {
continue;
}
}
if( format==null ) {
throw new UnsupportedAudioFileException("file is not a supported file type");
} else {
return format;
}
}
/**
* Obtains an audio input stream from the provided input stream. The stream must
* point to valid audio file data. The implementation of this method may
* require multiple parsers to
* examine the stream to determine whether they support it. These parsers must
* be able to mark the stream, read enough data to determine whether they
* support the stream, and, if not, reset the stream's read pointer to its original
* position. If the input stream does not support these operation, this method may fail
* with an <code>IOException</code>.
* @param stream the input stream from which the <code>AudioInputStream</code> should be
* constructed
* @return an <code>AudioInputStream</code> object based on the audio file data contained
* in the input stream.
* @throws UnsupportedAudioFileException if the stream does not point to valid audio
* file data recognized by the system
* @throws IOException if an I/O exception occurs
* @see InputStream#markSupported
* @see InputStream#mark
*/
public static AudioInputStream getAudioInputStream(InputStream stream)
throws UnsupportedAudioFileException, IOException {
List providers = getAudioFileReaders();
AudioInputStream audioStream = null;
for(int i = 0; i < providers.size(); i++ ) {
AudioFileReader reader = (AudioFileReader) providers.get(i);
try {
audioStream = reader.getAudioInputStream( stream ); // throws IOException
break;
} catch (UnsupportedAudioFileException e) {
continue;
}
}
if( audioStream==null ) {
throw new UnsupportedAudioFileException("could not get audio input stream from input stream");
} else {
return audioStream;
}
}
/**
* Obtains an audio input stream from the URL provided. The URL must
* point to valid audio file data.
* @param url the URL for which the <code>AudioInputStream</code> should be
* constructed
* @return an <code>AudioInputStream</code> object based on the audio file data pointed
* to by the URL
* @throws UnsupportedAudioFileException if the URL does not point to valid audio
* file data recognized by the system
* @throws IOException if an I/O exception occurs
*/
public static AudioInputStream getAudioInputStream(URL url)
throws UnsupportedAudioFileException, IOException {
List providers = getAudioFileReaders();
AudioInputStream audioStream = null;
for(int i = 0; i < providers.size(); i++ ) {
AudioFileReader reader = (AudioFileReader) providers.get(i);
try {
audioStream = reader.getAudioInputStream( url ); // throws IOException
break;
} catch (UnsupportedAudioFileException e) {
continue;
}
}
if( audioStream==null ) {
throw new UnsupportedAudioFileException("could not get audio input stream from input URL");
} else {
return audioStream;
}
}
/**
* Obtains an audio input stream from the provided <code>File</code>. The <code>File</code> must
* point to valid audio file data.
* @param file the <code>File</code> for which the <code>AudioInputStream</code> should be
* constructed
* @return an <code>AudioInputStream</code> object based on the audio file data pointed
* to by the <code>File</code>
* @throws UnsupportedAudioFileException if the <code>File</code> does not point to valid audio
* file data recognized by the system
* @throws IOException if an I/O exception occurs
*/
public static AudioInputStream getAudioInputStream(File file)
throws UnsupportedAudioFileException, IOException {
List providers = getAudioFileReaders();
AudioInputStream audioStream = null;
for(int i = 0; i < providers.size(); i++ ) {
AudioFileReader reader = (AudioFileReader) providers.get(i);
try {
audioStream = reader.getAudioInputStream( file ); // throws IOException
break;
} catch (UnsupportedAudioFileException e) {
continue;
}
}
if( audioStream==null ) {
throw new UnsupportedAudioFileException("could not get audio input stream from input file");
} else {
return audioStream;
}
}
/**
* Obtains the file types for which file writing support is provided by the system.
* @return array of unique file types. If no file types are supported,
* an array of length 0 is returned.
*/
public static AudioFileFormat.Type[] getAudioFileTypes() {
List providers = getAudioFileWriters();
Set returnTypesSet = new HashSet();
for(int i=0; i < providers.size(); i++) {
AudioFileWriter writer = (AudioFileWriter) providers.get(i);
AudioFileFormat.Type[] fileTypes = writer.getAudioFileTypes();
for(int j=0; j < fileTypes.length; j++) {
returnTypesSet.add(fileTypes[j]);
}
}
AudioFileFormat.Type returnTypes[] = (AudioFileFormat.Type[])
returnTypesSet.toArray(new AudioFileFormat.Type[0]);
return returnTypes;
}
/**
* Indicates whether file writing support for the specified file type is provided
* by the system.
* @param fileType the file type for which write capabilities are queried
* @return <code>true</code> if the file type is supported,
* otherwise <code>false</code>
*/
public static boolean isFileTypeSupported(AudioFileFormat.Type fileType) {
List providers = getAudioFileWriters();
for(int i=0; i < providers.size(); i++) {
AudioFileWriter writer = (AudioFileWriter) providers.get(i);
if (writer.isFileTypeSupported(fileType)) {
return true;
}
}
return false;
}
/**
* Obtains the file types that the system can write from the
* audio input stream specified.
* @param stream the audio input stream for which audio file type support
* is queried
* @return array of file types. If no file types are supported,
* an array of length 0 is returned.
*/
public static AudioFileFormat.Type[] getAudioFileTypes(AudioInputStream stream) {
List providers = getAudioFileWriters();
Set returnTypesSet = new HashSet();
for(int i=0; i < providers.size(); i++) {
AudioFileWriter writer = (AudioFileWriter) providers.get(i);
AudioFileFormat.Type[] fileTypes = writer.getAudioFileTypes(stream);
for(int j=0; j < fileTypes.length; j++) {
returnTypesSet.add(fileTypes[j]);
}
}
AudioFileFormat.Type returnTypes[] = (AudioFileFormat.Type[])
returnTypesSet.toArray(new AudioFileFormat.Type[0]);
return returnTypes;
}
/**
* Indicates whether an audio file of the specified file type can be written
* from the indicated audio input stream.
* @param fileType the file type for which write capabilities are queried
* @param stream the stream for which file-writing support is queried
* @return <code>true</code> if the file type is supported for this audio input stream,
* otherwise <code>false</code>
*/
public static boolean isFileTypeSupported(AudioFileFormat.Type fileType,
AudioInputStream stream) {
List providers = getAudioFileWriters();
for(int i=0; i < providers.size(); i++) {
AudioFileWriter writer = (AudioFileWriter) providers.get(i);
if(writer.isFileTypeSupported(fileType, stream)) {
return true;
}
}
return false;
}
/**
* Writes a stream of bytes representing an audio file of the specified file type
* to the output stream provided. Some file types require that
* the length be written into the file header; such files cannot be written from
* start to finish unless the length is known in advance. An attempt
* to write a file of such a type will fail with an IOException if the length in
* the audio file type is <code>AudioSystem.NOT_SPECIFIED</code>.
*
* @param stream the audio input stream containing audio data to be
* written to the file
* @param fileType the kind of audio file to write
* @param out the stream to which the file data should be written
* @return the number of bytes written to the output stream
* @throws IOException if an input/output exception occurs
* @throws IllegalArgumentException if the file type is not supported by
* the system
* @see #isFileTypeSupported
* @see #getAudioFileTypes
*/
public static int write(AudioInputStream stream, AudioFileFormat.Type fileType,
OutputStream out) throws IOException {
List providers = getAudioFileWriters();
int bytesWritten = 0;
boolean flag = false;
for(int i=0; i < providers.size(); i++) {
AudioFileWriter writer = (AudioFileWriter) providers.get(i);
try {
bytesWritten = writer.write( stream, fileType, out ); // throws IOException
flag = true;
break;
} catch (IllegalArgumentException e) {
// thrown if this provider cannot write the sequence, try the next
continue;
}
}
if(!flag) {
throw new IllegalArgumentException("could not write audio file: file type not supported: " + fileType);
} else {
return bytesWritten;
}
}
/**
* Writes a stream of bytes representing an audio file of the specified file type
* to the external file provided.
* @param stream the audio input stream containing audio data to be
* written to the file
* @param fileType the kind of audio file to write
* @param out the external file to which the file data should be written
* @return the number of bytes written to the file
* @throws IOException if an I/O exception occurs
* @throws IllegalArgumentException if the file type is not supported by
* the system
* @see #isFileTypeSupported
* @see #getAudioFileTypes
*/
public static int write(AudioInputStream stream, AudioFileFormat.Type fileType,
File out) throws IOException {
List providers = getAudioFileWriters();
int bytesWritten = 0;
boolean flag = false;
for(int i=0; i < providers.size(); i++) {
AudioFileWriter writer = (AudioFileWriter) providers.get(i);
try {
bytesWritten = writer.write( stream, fileType, out ); // throws IOException
flag = true;
break;
} catch (IllegalArgumentException e) {
// thrown if this provider cannot write the sequence, try the next
continue;
}
}
if (!flag) {
throw new IllegalArgumentException("could not write audio file: file type not supported: " + fileType);
} else {
return bytesWritten;
}
}
// METHODS FOR INTERNAL IMPLEMENTATION USE
/**
* Obtains the set of MixerProviders on the system.
*/
private static List getMixerProviders() {
return getProviders(MixerProvider.class);
}
/**
* Obtains the set of format converters (codecs, transcoders, etc.)
* that are currently installed on the system.
* @return an array of
* {@link javax.sound.sampled.spi.FormatConversionProvider
* FormatConversionProvider}
* objects representing the available format converters. If no format
* converters readers are available on the system, an array of length 0 is
* returned.
*/
private static List getFormatConversionProviders() {
return getProviders(FormatConversionProvider.class);
}
/**
* Obtains the set of audio file readers that are currently installed on the system.
* @return a List of
* {@link javax.sound.sampled.spi.AudioFileReader
* AudioFileReader}
* objects representing the installed audio file readers. If no audio file
* readers are available on the system, an empty List is returned.
*/
private static List getAudioFileReaders() {
return getProviders(AudioFileReader.class);
}
/**
* Obtains the set of audio file writers that are currently installed on the system.
* @return a List of
* {@link javax.sound.samples.spi.AudioFileWriter AudioFileWriter}
* objects representing the available audio file writers. If no audio file
* writers are available on the system, an empty List is returned.
*/
private static List getAudioFileWriters() {
return getProviders(AudioFileWriter.class);
}
/** Attempts to locate and return a default Mixer that provides lines
* of the specified type.
*
* @param providers the installed mixer providers
* @param info The requested line type
* TargetDataLine.class, Clip.class or Port.class.
* @return a Mixer that matches the requirements, or null if no default mixer found
*/
private static Mixer getDefaultMixer(List providers, Line.Info info) {
Class lineClass = info.getLineClass();
String providerClassName = JDK13Services.getDefaultProviderClassName(lineClass);
String instanceName = JDK13Services.getDefaultInstanceName(lineClass);
Mixer mixer;
if (providerClassName != null) {
MixerProvider defaultProvider = getNamedProvider(providerClassName, providers);
if (defaultProvider != null) {
if (instanceName != null) {
mixer = getNamedMixer(instanceName, defaultProvider, info);
if (mixer != null) {
return mixer;
}
} else {
mixer = getFirstMixer(defaultProvider, info,
false /* mixing not required*/);
if (mixer != null) {
return mixer;
}
}
}
}
/* Provider class not specified or
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