179 * methods may also accept or return this value, as documented.
180 */
181 public static final int NOT_SPECIFIED = -1;
182
183 /**
184 * Private no-args constructor for ensuring against instantiation.
185 */
186 private AudioSystem() {
187 }
188
189
190 /**
191 * Obtains an array of mixer info objects that represents
192 * the set of audio mixers that are currently installed on the system.
193 * @return an array of info objects for the currently installed mixers. If no mixers
194 * are available on the system, an array of length 0 is returned.
195 * @see #getMixer
196 */
197 public static Mixer.Info[] getMixerInfo() {
198
199 List infos = getMixerInfoList();
200 Mixer.Info[] allInfos = (Mixer.Info[]) infos.toArray(new Mixer.Info[infos.size()]);
201 return allInfos;
202 }
203
204
205 /**
206 * Obtains the requested audio mixer.
207 * @param info a <code>Mixer.Info</code> object representing the desired
208 * mixer, or <code>null</code> for the system default mixer
209 * @return the requested mixer
210 * @throws SecurityException if the requested mixer
211 * is unavailable because of security restrictions
212 * @throws IllegalArgumentException if the info object does not represent
213 * a mixer installed on the system
214 * @see #getMixerInfo
215 */
216 public static Mixer getMixer(Mixer.Info info) {
217
218 Mixer mixer = null;
219 List providers = getMixerProviders();
220
221 for(int i = 0; i < providers.size(); i++ ) {
222
223 try {
224 return ((MixerProvider)providers.get(i)).getMixer(info);
225
226 } catch (IllegalArgumentException e) {
227 } catch (NullPointerException e) {
228 // $$jb 08.20.99: If the strings in the info object aren't
229 // set, then Netscape (using jdk1.1.5) tends to throw
230 // NPE's when doing some string manipulation. This is
231 // probably not the best fix, but is solves the problem
232 // of the NPE in Netscape using local classes
233 // $$jb 11.01.99: Replacing this patch.
234 }
235 }
236
237 //$$fb if looking for default mixer, and not found yet, add a round of looking
238 if (info == null) {
239 for(int i = 0; i < providers.size(); i++ ) {
240 try {
241 MixerProvider provider = (MixerProvider) providers.get(i);
242 Mixer.Info[] infos = provider.getMixerInfo();
243 // start from 0 to last device (do not reverse this order)
244 for (int ii = 0; ii < infos.length; ii++) {
245 try {
246 return provider.getMixer(infos[ii]);
247 } catch (IllegalArgumentException e) {
248 // this is not a good default device :)
249 }
250 }
251 } catch (IllegalArgumentException e) {
252 } catch (NullPointerException e) {
253 }
254 }
255 }
256
257
258 throw new IllegalArgumentException("Mixer not supported: "
259 + (info!=null?info.toString():"null"));
260 }
261
262
263 //$$fb 2002-11-26: fix for 4757930: DOC: AudioSystem.getTarget/SourceLineInfo() is ambiguous
264 /**
265 * Obtains information about all source lines of a particular type that are supported
266 * by the installed mixers.
267 * @param info a <code>Line.Info</code> object that specifies the kind of
268 * lines about which information is requested
269 * @return an array of <code>Line.Info</code> objects describing source lines matching
270 * the type requested. If no matching source lines are supported, an array of length 0
271 * is returned.
272 *
273 * @see Mixer#getSourceLineInfo(Line.Info)
274 */
275 public static Line.Info[] getSourceLineInfo(Line.Info info) {
276
277 Vector vector = new Vector();
278 Line.Info[] currentInfoArray;
279
280 Mixer mixer;
281 Line.Info fullInfo = null;
282 Mixer.Info[] infoArray = getMixerInfo();
283
284 for (int i = 0; i < infoArray.length; i++) {
285
286 mixer = getMixer(infoArray[i]);
287
288 currentInfoArray = mixer.getSourceLineInfo(info);
289 for (int j = 0; j < currentInfoArray.length; j++) {
290 vector.addElement(currentInfoArray[j]);
291 }
292 }
293
294 Line.Info[] returnedArray = new Line.Info[vector.size()];
295
296 for (int i = 0; i < returnedArray.length; i++) {
297 returnedArray[i] = (Line.Info)vector.get(i);
298 }
299
300 return returnedArray;
301 }
302
303
304 /**
305 * Obtains information about all target lines of a particular type that are supported
306 * by the installed mixers.
307 * @param info a <code>Line.Info</code> object that specifies the kind of
308 * lines about which information is requested
309 * @return an array of <code>Line.Info</code> objects describing target lines matching
310 * the type requested. If no matching target lines are supported, an array of length 0
311 * is returned.
312 *
313 * @see Mixer#getTargetLineInfo(Line.Info)
314 */
315 public static Line.Info[] getTargetLineInfo(Line.Info info) {
316
317 Vector vector = new Vector();
318 Line.Info[] currentInfoArray;
319
320 Mixer mixer;
321 Line.Info fullInfo = null;
322 Mixer.Info[] infoArray = getMixerInfo();
323
324 for (int i = 0; i < infoArray.length; i++) {
325
326 mixer = getMixer(infoArray[i]);
327
328 currentInfoArray = mixer.getTargetLineInfo(info);
329 for (int j = 0; j < currentInfoArray.length; j++) {
330 vector.addElement(currentInfoArray[j]);
331 }
332 }
333
334 Line.Info[] returnedArray = new Line.Info[vector.size()];
335
336 for (int i = 0; i < returnedArray.length; i++) {
337 returnedArray[i] = (Line.Info)vector.get(i);
338 }
339
340 return returnedArray;
341 }
342
343
344 /**
345 * Indicates whether the system supports any lines that match
346 * the specified <code>Line.Info</code> object. A line is supported if
347 * any installed mixer supports it.
348 * @param info a <code>Line.Info</code> object describing the line for which support is queried
349 * @return <code>true</code> if at least one matching line is
350 * supported, otherwise <code>false</code>
351 *
352 * @see Mixer#isLineSupported(Line.Info)
353 */
354 public static boolean isLineSupported(Line.Info info) {
355
356 Mixer mixer;
357 Mixer.Info[] infoArray = getMixerInfo();
391 * If the respective property is not set, or the mixer
392 * requested in the property is not installed or does not provide the
393 * requested line, all installed mixers are queried for the
394 * requested line type. A Line will be returned from the first mixer
395 * providing the requested line type.
396 *
397 * @param info a <code>Line.Info</code> object describing the desired kind of line
398 * @return a line of the requested kind
399 *
400 * @throws LineUnavailableException if a matching line
401 * is not available due to resource restrictions
402 * @throws SecurityException if a matching line
403 * is not available due to security restrictions
404 * @throws IllegalArgumentException if the system does not
405 * support at least one line matching the specified
406 * <code>Line.Info</code> object
407 * through any installed mixer
408 */
409 public static Line getLine(Line.Info info) throws LineUnavailableException {
410 LineUnavailableException lue = null;
411 List providers = getMixerProviders();
412
413
414 // 1: try from default mixer for this line class
415 try {
416 Mixer mixer = getDefaultMixer(providers, info);
417 if (mixer != null && mixer.isLineSupported(info)) {
418 return mixer.getLine(info);
419 }
420 } catch (LineUnavailableException e) {
421 lue = e;
422 } catch (IllegalArgumentException iae) {
423 // must not happen... but better to catch it here,
424 // if plug-ins are badly written
425 }
426
427
428 // 2: if that doesn't work, try to find any mixing mixer
429 for(int i = 0; i < providers.size(); i++) {
430 MixerProvider provider = (MixerProvider) providers.get(i);
431 Mixer.Info[] infos = provider.getMixerInfo();
432
433 for (int j = 0; j < infos.length; j++) {
434 try {
435 Mixer mixer = provider.getMixer(infos[j]);
436 // see if this is an appropriate mixer which can mix
437 if (isAppropriateMixer(mixer, info, true)) {
438 return mixer.getLine(info);
439 }
440 } catch (LineUnavailableException e) {
441 lue = e;
442 } catch (IllegalArgumentException iae) {
443 // must not happen... but better to catch it here,
444 // if plug-ins are badly written
445 }
446 }
447 }
448
449
450 // 3: if that didn't work, try to find any non-mixing mixer
451 for(int i = 0; i < providers.size(); i++) {
452 MixerProvider provider = (MixerProvider) providers.get(i);
453 Mixer.Info[] infos = provider.getMixerInfo();
454 for (int j = 0; j < infos.length; j++) {
455 try {
456 Mixer mixer = provider.getMixer(infos[j]);
457 // see if this is an appropriate mixer which can mix
458 if (isAppropriateMixer(mixer, info, false)) {
459 return mixer.getLine(info);
460 }
461 } catch (LineUnavailableException e) {
462 lue = e;
463 } catch (IllegalArgumentException iae) {
464 // must not happen... but better to catch it here,
465 // if plug-ins are badly written
466 }
467 }
468 }
469
470 // if this line was supported but was not available, throw the last
471 // LineUnavailableException we got (??).
472 if (lue != null) {
747
748 DataLine.Info info = new DataLine.Info(TargetDataLine.class, format);
749 Mixer mixer = AudioSystem.getMixer(mixerinfo);
750 return (TargetDataLine) mixer.getLine(info);
751 }
752
753
754 // $$fb 2002-04-12: fix for 4662082: behavior of AudioSystem.getTargetEncodings() methods doesn't match the spec
755 /**
756 * Obtains the encodings that the system can obtain from an
757 * audio input stream with the specified encoding using the set
758 * of installed format converters.
759 * @param sourceEncoding the encoding for which conversion support
760 * is queried
761 * @return array of encodings. If <code>sourceEncoding</code>is not supported,
762 * an array of length 0 is returned. Otherwise, the array will have a length
763 * of at least 1, representing <code>sourceEncoding</code> (no conversion).
764 */
765 public static AudioFormat.Encoding[] getTargetEncodings(AudioFormat.Encoding sourceEncoding) {
766
767 List codecs = getFormatConversionProviders();
768 Vector encodings = new Vector();
769
770 AudioFormat.Encoding encs[] = null;
771
772 // gather from all the codecs
773 for(int i=0; i<codecs.size(); i++ ) {
774 FormatConversionProvider codec = (FormatConversionProvider) codecs.get(i);
775 if( codec.isSourceEncodingSupported( sourceEncoding ) ) {
776 encs = codec.getTargetEncodings();
777 for (int j = 0; j < encs.length; j++) {
778 encodings.addElement( encs[j] );
779 }
780 }
781 }
782 AudioFormat.Encoding encs2[] = (AudioFormat.Encoding[]) encodings.toArray(new AudioFormat.Encoding[0]);
783 return encs2;
784 }
785
786
787
788 // $$fb 2002-04-12: fix for 4662082: behavior of AudioSystem.getTargetEncodings() methods doesn't match the spec
789 /**
790 * Obtains the encodings that the system can obtain from an
791 * audio input stream with the specified format using the set
792 * of installed format converters.
793 * @param sourceFormat the audio format for which conversion
794 * is queried
795 * @return array of encodings. If <code>sourceFormat</code>is not supported,
796 * an array of length 0 is returned. Otherwise, the array will have a length
797 * of at least 1, representing the encoding of <code>sourceFormat</code> (no conversion).
798 */
799 public static AudioFormat.Encoding[] getTargetEncodings(AudioFormat sourceFormat) {
800
801
802 List codecs = getFormatConversionProviders();
803 Vector encodings = new Vector();
804
805 int size = 0;
806 int index = 0;
807 AudioFormat.Encoding encs[] = null;
808
809 // gather from all the codecs
810
811 for(int i=0; i<codecs.size(); i++ ) {
812 encs = ((FormatConversionProvider) codecs.get(i)).getTargetEncodings(sourceFormat);
813 size += encs.length;
814 encodings.addElement( encs );
815 }
816
817 // now build a new array
818
819 AudioFormat.Encoding encs2[] = new AudioFormat.Encoding[size];
820 for(int i=0; i<encodings.size(); i++ ) {
821 encs = (AudioFormat.Encoding [])(encodings.get(i));
822 for(int j=0; j<encs.length; j++ ) {
823 encs2[index++] = encs[j];
824 }
825 }
826 return encs2;
827 }
828
829
830 /**
831 * Indicates whether an audio input stream of the specified encoding
832 * can be obtained from an audio input stream that has the specified
833 * format.
834 * @param targetEncoding the desired encoding after conversion
835 * @param sourceFormat the audio format before conversion
836 * @return <code>true</code> if the conversion is supported,
837 * otherwise <code>false</code>
838 */
839 public static boolean isConversionSupported(AudioFormat.Encoding targetEncoding, AudioFormat sourceFormat) {
840
841
842 List codecs = getFormatConversionProviders();
843
844 for(int i=0; i<codecs.size(); i++ ) {
845 FormatConversionProvider codec = (FormatConversionProvider) codecs.get(i);
846 if(codec.isConversionSupported(targetEncoding,sourceFormat) ) {
847 return true;
848 }
849 }
850 return false;
851 }
852
853
854 /**
855 * Obtains an audio input stream of the indicated encoding, by converting the
856 * provided audio input stream.
857 * @param targetEncoding the desired encoding after conversion
858 * @param sourceStream the stream to be converted
859 * @return an audio input stream of the indicated encoding
860 * @throws IllegalArgumentException if the conversion is not supported
861 * @see #getTargetEncodings(AudioFormat.Encoding)
862 * @see #getTargetEncodings(AudioFormat)
863 * @see #isConversionSupported(AudioFormat.Encoding, AudioFormat)
864 * @see #getAudioInputStream(AudioFormat, AudioInputStream)
865 */
866 public static AudioInputStream getAudioInputStream(AudioFormat.Encoding targetEncoding,
867 AudioInputStream sourceStream) {
868
869 List codecs = getFormatConversionProviders();
870
871 for(int i = 0; i < codecs.size(); i++) {
872 FormatConversionProvider codec = (FormatConversionProvider) codecs.get(i);
873 if( codec.isConversionSupported( targetEncoding, sourceStream.getFormat() ) ) {
874 return codec.getAudioInputStream( targetEncoding, sourceStream );
875 }
876 }
877 // we ran out of options, throw an exception
878 throw new IllegalArgumentException("Unsupported conversion: " + targetEncoding + " from " + sourceStream.getFormat());
879 }
880
881
882 /**
883 * Obtains the formats that have a particular encoding and that the system can
884 * obtain from a stream of the specified format using the set of
885 * installed format converters.
886 * @param targetEncoding the desired encoding after conversion
887 * @param sourceFormat the audio format before conversion
888 * @return array of formats. If no formats of the specified
889 * encoding are supported, an array of length 0 is returned.
890 */
891 public static AudioFormat[] getTargetFormats(AudioFormat.Encoding targetEncoding, AudioFormat sourceFormat) {
892
893 List codecs = getFormatConversionProviders();
894 Vector formats = new Vector();
895
896 int size = 0;
897 int index = 0;
898 AudioFormat fmts[] = null;
899
900 // gather from all the codecs
901
902 for(int i=0; i<codecs.size(); i++ ) {
903 FormatConversionProvider codec = (FormatConversionProvider) codecs.get(i);
904 fmts = codec.getTargetFormats(targetEncoding, sourceFormat);
905 size += fmts.length;
906 formats.addElement( fmts );
907 }
908
909 // now build a new array
910
911 AudioFormat fmts2[] = new AudioFormat[size];
912 for(int i=0; i<formats.size(); i++ ) {
913 fmts = (AudioFormat [])(formats.get(i));
914 for(int j=0; j<fmts.length; j++ ) {
915 fmts2[index++] = fmts[j];
916 }
917 }
918 return fmts2;
919 }
920
921
922 /**
923 * Indicates whether an audio input stream of a specified format
924 * can be obtained from an audio input stream of another specified format.
925 * @param targetFormat the desired audio format after conversion
926 * @param sourceFormat the audio format before conversion
927 * @return <code>true</code> if the conversion is supported,
928 * otherwise <code>false</code>
929 */
930
931 public static boolean isConversionSupported(AudioFormat targetFormat, AudioFormat sourceFormat) {
932
933 List codecs = getFormatConversionProviders();
934
935 for(int i=0; i<codecs.size(); i++ ) {
936 FormatConversionProvider codec = (FormatConversionProvider) codecs.get(i);
937 if(codec.isConversionSupported(targetFormat, sourceFormat) ) {
938 return true;
939 }
940 }
941 return false;
942 }
943
944
945 /**
946 * Obtains an audio input stream of the indicated format, by converting the
947 * provided audio input stream.
948 * @param targetFormat the desired audio format after conversion
949 * @param sourceStream the stream to be converted
950 * @return an audio input stream of the indicated format
951 * @throws IllegalArgumentException if the conversion is not supported
952 * #see #getTargetEncodings(AudioFormat)
953 * @see #getTargetFormats(AudioFormat.Encoding, AudioFormat)
954 * @see #isConversionSupported(AudioFormat, AudioFormat)
955 * @see #getAudioInputStream(AudioFormat.Encoding, AudioInputStream)
956 */
957 public static AudioInputStream getAudioInputStream(AudioFormat targetFormat,
958 AudioInputStream sourceStream) {
959
960 if (sourceStream.getFormat().matches(targetFormat)) {
961 return sourceStream;
962 }
963
964 List codecs = getFormatConversionProviders();
965
966 for(int i = 0; i < codecs.size(); i++) {
967 FormatConversionProvider codec = (FormatConversionProvider) codecs.get(i);
968 if(codec.isConversionSupported(targetFormat,sourceStream.getFormat()) ) {
969 return codec.getAudioInputStream(targetFormat,sourceStream);
970 }
971 }
972
973 // we ran out of options...
974 throw new IllegalArgumentException("Unsupported conversion: " + targetFormat + " from " + sourceStream.getFormat());
975 }
976
977
978 /**
979 * Obtains the audio file format of the provided input stream. The stream must
980 * point to valid audio file data. The implementation of this method may require
981 * multiple parsers to examine the stream to determine whether they support it.
982 * These parsers must be able to mark the stream, read enough data to determine whether they
983 * support the stream, and, if not, reset the stream's read pointer to its original
984 * position. If the input stream does not support these operations, this method may fail
985 * with an <code>IOException</code>.
986 * @param stream the input stream from which file format information should be
987 * extracted
988 * @return an <code>AudioFileFormat</code> object describing the stream's audio file format
989 * @throws UnsupportedAudioFileException if the stream does not point to valid audio
990 * file data recognized by the system
991 * @throws IOException if an input/output exception occurs
992 * @see InputStream#markSupported
993 * @see InputStream#mark
994 */
995 public static AudioFileFormat getAudioFileFormat(InputStream stream)
996 throws UnsupportedAudioFileException, IOException {
997
998 List providers = getAudioFileReaders();
999 AudioFileFormat format = null;
1000
1001 for(int i = 0; i < providers.size(); i++ ) {
1002 AudioFileReader reader = (AudioFileReader) providers.get(i);
1003 try {
1004 format = reader.getAudioFileFormat( stream ); // throws IOException
1005 break;
1006 } catch (UnsupportedAudioFileException e) {
1007 continue;
1008 }
1009 }
1010
1011 if( format==null ) {
1012 throw new UnsupportedAudioFileException("file is not a supported file type");
1013 } else {
1014 return format;
1015 }
1016 }
1017
1018 /**
1019 * Obtains the audio file format of the specified URL. The URL must
1020 * point to valid audio file data.
1021 * @param url the URL from which file format information should be
1022 * extracted
1023 * @return an <code>AudioFileFormat</code> object describing the audio file format
1024 * @throws UnsupportedAudioFileException if the URL does not point to valid audio
1025 * file data recognized by the system
1026 * @throws IOException if an input/output exception occurs
1027 */
1028 public static AudioFileFormat getAudioFileFormat(URL url)
1029 throws UnsupportedAudioFileException, IOException {
1030
1031 List providers = getAudioFileReaders();
1032 AudioFileFormat format = null;
1033
1034 for(int i = 0; i < providers.size(); i++ ) {
1035 AudioFileReader reader = (AudioFileReader) providers.get(i);
1036 try {
1037 format = reader.getAudioFileFormat( url ); // throws IOException
1038 break;
1039 } catch (UnsupportedAudioFileException e) {
1040 continue;
1041 }
1042 }
1043
1044 if( format==null ) {
1045 throw new UnsupportedAudioFileException("file is not a supported file type");
1046 } else {
1047 return format;
1048 }
1049 }
1050
1051 /**
1052 * Obtains the audio file format of the specified <code>File</code>. The <code>File</code> must
1053 * point to valid audio file data.
1054 * @param file the <code>File</code> from which file format information should be
1055 * extracted
1056 * @return an <code>AudioFileFormat</code> object describing the audio file format
1057 * @throws UnsupportedAudioFileException if the <code>File</code> does not point to valid audio
1058 * file data recognized by the system
1059 * @throws IOException if an I/O exception occurs
1060 */
1061 public static AudioFileFormat getAudioFileFormat(File file)
1062 throws UnsupportedAudioFileException, IOException {
1063
1064 List providers = getAudioFileReaders();
1065 AudioFileFormat format = null;
1066
1067 for(int i = 0; i < providers.size(); i++ ) {
1068 AudioFileReader reader = (AudioFileReader) providers.get(i);
1069 try {
1070 format = reader.getAudioFileFormat( file ); // throws IOException
1071 break;
1072 } catch (UnsupportedAudioFileException e) {
1073 continue;
1074 }
1075 }
1076
1077 if( format==null ) {
1078 throw new UnsupportedAudioFileException("file is not a supported file type");
1079 } else {
1080 return format;
1081 }
1082 }
1083
1084
1085 /**
1086 * Obtains an audio input stream from the provided input stream. The stream must
1087 * point to valid audio file data. The implementation of this method may
1088 * require multiple parsers to
1089 * examine the stream to determine whether they support it. These parsers must
1090 * be able to mark the stream, read enough data to determine whether they
1091 * support the stream, and, if not, reset the stream's read pointer to its original
1092 * position. If the input stream does not support these operation, this method may fail
1093 * with an <code>IOException</code>.
1094 * @param stream the input stream from which the <code>AudioInputStream</code> should be
1095 * constructed
1096 * @return an <code>AudioInputStream</code> object based on the audio file data contained
1097 * in the input stream.
1098 * @throws UnsupportedAudioFileException if the stream does not point to valid audio
1099 * file data recognized by the system
1100 * @throws IOException if an I/O exception occurs
1101 * @see InputStream#markSupported
1102 * @see InputStream#mark
1103 */
1104 public static AudioInputStream getAudioInputStream(InputStream stream)
1105 throws UnsupportedAudioFileException, IOException {
1106
1107 List providers = getAudioFileReaders();
1108 AudioInputStream audioStream = null;
1109
1110 for(int i = 0; i < providers.size(); i++ ) {
1111 AudioFileReader reader = (AudioFileReader) providers.get(i);
1112 try {
1113 audioStream = reader.getAudioInputStream( stream ); // throws IOException
1114 break;
1115 } catch (UnsupportedAudioFileException e) {
1116 continue;
1117 }
1118 }
1119
1120 if( audioStream==null ) {
1121 throw new UnsupportedAudioFileException("could not get audio input stream from input stream");
1122 } else {
1123 return audioStream;
1124 }
1125 }
1126
1127 /**
1128 * Obtains an audio input stream from the URL provided. The URL must
1129 * point to valid audio file data.
1130 * @param url the URL for which the <code>AudioInputStream</code> should be
1131 * constructed
1132 * @return an <code>AudioInputStream</code> object based on the audio file data pointed
1133 * to by the URL
1134 * @throws UnsupportedAudioFileException if the URL does not point to valid audio
1135 * file data recognized by the system
1136 * @throws IOException if an I/O exception occurs
1137 */
1138 public static AudioInputStream getAudioInputStream(URL url)
1139 throws UnsupportedAudioFileException, IOException {
1140
1141 List providers = getAudioFileReaders();
1142 AudioInputStream audioStream = null;
1143
1144 for(int i = 0; i < providers.size(); i++ ) {
1145 AudioFileReader reader = (AudioFileReader) providers.get(i);
1146 try {
1147 audioStream = reader.getAudioInputStream( url ); // throws IOException
1148 break;
1149 } catch (UnsupportedAudioFileException e) {
1150 continue;
1151 }
1152 }
1153
1154 if( audioStream==null ) {
1155 throw new UnsupportedAudioFileException("could not get audio input stream from input URL");
1156 } else {
1157 return audioStream;
1158 }
1159 }
1160
1161 /**
1162 * Obtains an audio input stream from the provided <code>File</code>. The <code>File</code> must
1163 * point to valid audio file data.
1164 * @param file the <code>File</code> for which the <code>AudioInputStream</code> should be
1165 * constructed
1166 * @return an <code>AudioInputStream</code> object based on the audio file data pointed
1167 * to by the <code>File</code>
1168 * @throws UnsupportedAudioFileException if the <code>File</code> does not point to valid audio
1169 * file data recognized by the system
1170 * @throws IOException if an I/O exception occurs
1171 */
1172 public static AudioInputStream getAudioInputStream(File file)
1173 throws UnsupportedAudioFileException, IOException {
1174
1175 List providers = getAudioFileReaders();
1176 AudioInputStream audioStream = null;
1177
1178 for(int i = 0; i < providers.size(); i++ ) {
1179 AudioFileReader reader = (AudioFileReader) providers.get(i);
1180 try {
1181 audioStream = reader.getAudioInputStream( file ); // throws IOException
1182 break;
1183 } catch (UnsupportedAudioFileException e) {
1184 continue;
1185 }
1186 }
1187
1188 if( audioStream==null ) {
1189 throw new UnsupportedAudioFileException("could not get audio input stream from input file");
1190 } else {
1191 return audioStream;
1192 }
1193 }
1194
1195
1196 /**
1197 * Obtains the file types for which file writing support is provided by the system.
1198 * @return array of unique file types. If no file types are supported,
1199 * an array of length 0 is returned.
1200 */
1201 public static AudioFileFormat.Type[] getAudioFileTypes() {
1202 List providers = getAudioFileWriters();
1203 Set returnTypesSet = new HashSet();
1204
1205 for(int i=0; i < providers.size(); i++) {
1206 AudioFileWriter writer = (AudioFileWriter) providers.get(i);
1207 AudioFileFormat.Type[] fileTypes = writer.getAudioFileTypes();
1208 for(int j=0; j < fileTypes.length; j++) {
1209 returnTypesSet.add(fileTypes[j]);
1210 }
1211 }
1212 AudioFileFormat.Type returnTypes[] = (AudioFileFormat.Type[])
1213 returnTypesSet.toArray(new AudioFileFormat.Type[0]);
1214 return returnTypes;
1215 }
1216
1217
1218 /**
1219 * Indicates whether file writing support for the specified file type is provided
1220 * by the system.
1221 * @param fileType the file type for which write capabilities are queried
1222 * @return <code>true</code> if the file type is supported,
1223 * otherwise <code>false</code>
1224 */
1225 public static boolean isFileTypeSupported(AudioFileFormat.Type fileType) {
1226
1227 List providers = getAudioFileWriters();
1228
1229 for(int i=0; i < providers.size(); i++) {
1230 AudioFileWriter writer = (AudioFileWriter) providers.get(i);
1231 if (writer.isFileTypeSupported(fileType)) {
1232 return true;
1233 }
1234 }
1235 return false;
1236 }
1237
1238
1239 /**
1240 * Obtains the file types that the system can write from the
1241 * audio input stream specified.
1242 * @param stream the audio input stream for which audio file type support
1243 * is queried
1244 * @return array of file types. If no file types are supported,
1245 * an array of length 0 is returned.
1246 */
1247 public static AudioFileFormat.Type[] getAudioFileTypes(AudioInputStream stream) {
1248 List providers = getAudioFileWriters();
1249 Set returnTypesSet = new HashSet();
1250
1251 for(int i=0; i < providers.size(); i++) {
1252 AudioFileWriter writer = (AudioFileWriter) providers.get(i);
1253 AudioFileFormat.Type[] fileTypes = writer.getAudioFileTypes(stream);
1254 for(int j=0; j < fileTypes.length; j++) {
1255 returnTypesSet.add(fileTypes[j]);
1256 }
1257 }
1258 AudioFileFormat.Type returnTypes[] = (AudioFileFormat.Type[])
1259 returnTypesSet.toArray(new AudioFileFormat.Type[0]);
1260 return returnTypes;
1261 }
1262
1263
1264 /**
1265 * Indicates whether an audio file of the specified file type can be written
1266 * from the indicated audio input stream.
1267 * @param fileType the file type for which write capabilities are queried
1268 * @param stream the stream for which file-writing support is queried
1269 * @return <code>true</code> if the file type is supported for this audio input stream,
1270 * otherwise <code>false</code>
1271 */
1272 public static boolean isFileTypeSupported(AudioFileFormat.Type fileType,
1273 AudioInputStream stream) {
1274
1275 List providers = getAudioFileWriters();
1276
1277 for(int i=0; i < providers.size(); i++) {
1278 AudioFileWriter writer = (AudioFileWriter) providers.get(i);
1279 if(writer.isFileTypeSupported(fileType, stream)) {
1280 return true;
1281 }
1282 }
1283 return false;
1284 }
1285
1286
1287 /**
1288 * Writes a stream of bytes representing an audio file of the specified file type
1289 * to the output stream provided. Some file types require that
1290 * the length be written into the file header; such files cannot be written from
1291 * start to finish unless the length is known in advance. An attempt
1292 * to write a file of such a type will fail with an IOException if the length in
1293 * the audio file type is <code>AudioSystem.NOT_SPECIFIED</code>.
1294 *
1295 * @param stream the audio input stream containing audio data to be
1296 * written to the file
1297 * @param fileType the kind of audio file to write
1298 * @param out the stream to which the file data should be written
1299 * @return the number of bytes written to the output stream
1300 * @throws IOException if an input/output exception occurs
1301 * @throws IllegalArgumentException if the file type is not supported by
1302 * the system
1303 * @see #isFileTypeSupported
1304 * @see #getAudioFileTypes
1305 */
1306 public static int write(AudioInputStream stream, AudioFileFormat.Type fileType,
1307 OutputStream out) throws IOException {
1308
1309 List providers = getAudioFileWriters();
1310 int bytesWritten = 0;
1311 boolean flag = false;
1312
1313 for(int i=0; i < providers.size(); i++) {
1314 AudioFileWriter writer = (AudioFileWriter) providers.get(i);
1315 try {
1316 bytesWritten = writer.write( stream, fileType, out ); // throws IOException
1317 flag = true;
1318 break;
1319 } catch (IllegalArgumentException e) {
1320 // thrown if this provider cannot write the sequence, try the next
1321 continue;
1322 }
1323 }
1324 if(!flag) {
1325 throw new IllegalArgumentException("could not write audio file: file type not supported: " + fileType);
1326 } else {
1327 return bytesWritten;
1328 }
1329 }
1330
1331
1332 /**
1333 * Writes a stream of bytes representing an audio file of the specified file type
1334 * to the external file provided.
1335 * @param stream the audio input stream containing audio data to be
1336 * written to the file
1337 * @param fileType the kind of audio file to write
1338 * @param out the external file to which the file data should be written
1339 * @return the number of bytes written to the file
1340 * @throws IOException if an I/O exception occurs
1341 * @throws IllegalArgumentException if the file type is not supported by
1342 * the system
1343 * @see #isFileTypeSupported
1344 * @see #getAudioFileTypes
1345 */
1346 public static int write(AudioInputStream stream, AudioFileFormat.Type fileType,
1347 File out) throws IOException {
1348
1349 List providers = getAudioFileWriters();
1350 int bytesWritten = 0;
1351 boolean flag = false;
1352
1353 for(int i=0; i < providers.size(); i++) {
1354 AudioFileWriter writer = (AudioFileWriter) providers.get(i);
1355 try {
1356 bytesWritten = writer.write( stream, fileType, out ); // throws IOException
1357 flag = true;
1358 break;
1359 } catch (IllegalArgumentException e) {
1360 // thrown if this provider cannot write the sequence, try the next
1361 continue;
1362 }
1363 }
1364 if (!flag) {
1365 throw new IllegalArgumentException("could not write audio file: file type not supported: " + fileType);
1366 } else {
1367 return bytesWritten;
1368 }
1369 }
1370
1371
1372 // METHODS FOR INTERNAL IMPLEMENTATION USE
1373
1374 /**
1375 * Obtains the set of MixerProviders on the system.
1376 */
1377 private static List getMixerProviders() {
1378 return getProviders(MixerProvider.class);
1379 }
1380
1381
1382 /**
1383 * Obtains the set of format converters (codecs, transcoders, etc.)
1384 * that are currently installed on the system.
1385 * @return an array of
1386 * {@link javax.sound.sampled.spi.FormatConversionProvider
1387 * FormatConversionProvider}
1388 * objects representing the available format converters. If no format
1389 * converters readers are available on the system, an array of length 0 is
1390 * returned.
1391 */
1392 private static List getFormatConversionProviders() {
1393 return getProviders(FormatConversionProvider.class);
1394 }
1395
1396
1397 /**
1398 * Obtains the set of audio file readers that are currently installed on the system.
1399 * @return a List of
1400 * {@link javax.sound.sampled.spi.AudioFileReader
1401 * AudioFileReader}
1402 * objects representing the installed audio file readers. If no audio file
1403 * readers are available on the system, an empty List is returned.
1404 */
1405 private static List getAudioFileReaders() {
1406 return getProviders(AudioFileReader.class);
1407 }
1408
1409
1410 /**
1411 * Obtains the set of audio file writers that are currently installed on the system.
1412 * @return a List of
1413 * {@link javax.sound.samples.spi.AudioFileWriter AudioFileWriter}
1414 * objects representing the available audio file writers. If no audio file
1415 * writers are available on the system, an empty List is returned.
1416 */
1417 private static List getAudioFileWriters() {
1418 return getProviders(AudioFileWriter.class);
1419 }
1420
1421
1422
1423 /** Attempts to locate and return a default Mixer that provides lines
1424 * of the specified type.
1425 *
1426 * @param providers the installed mixer providers
1427 * @param info The requested line type
1428 * TargetDataLine.class, Clip.class or Port.class.
1429 * @return a Mixer that matches the requirements, or null if no default mixer found
1430 */
1431 private static Mixer getDefaultMixer(List providers, Line.Info info) {
1432 Class lineClass = info.getLineClass();
1433 String providerClassName = JDK13Services.getDefaultProviderClassName(lineClass);
1434 String instanceName = JDK13Services.getDefaultInstanceName(lineClass);
1435 Mixer mixer;
1436
1437 if (providerClassName != null) {
1438 MixerProvider defaultProvider = getNamedProvider(providerClassName, providers);
1439 if (defaultProvider != null) {
1440 if (instanceName != null) {
1441 mixer = getNamedMixer(instanceName, defaultProvider, info);
1442 if (mixer != null) {
1443 return mixer;
1444 }
1445 } else {
1446 mixer = getFirstMixer(defaultProvider, info,
1447 false /* mixing not required*/);
1448 if (mixer != null) {
1449 return mixer;
1450 }
1451 }
1452
1464 }
1465
1466
1467 /* No default are specified, or if something is specified, everything
1468 failed. */
1469 return null;
1470 }
1471
1472
1473
1474 /** Return a MixerProvider of a given class from the list of
1475 MixerProviders.
1476
1477 This method never requires the returned Mixer to do mixing.
1478 @param providerClassName The class name of the provider to be returned.
1479 @param providers The list of MixerProviders that is searched.
1480 @return A MixerProvider of the requested class, or null if none is
1481 found.
1482 */
1483 private static MixerProvider getNamedProvider(String providerClassName,
1484 List providers) {
1485 for(int i = 0; i < providers.size(); i++) {
1486 MixerProvider provider = (MixerProvider) providers.get(i);
1487 if (provider.getClass().getName().equals(providerClassName)) {
1488 return provider;
1489 }
1490 }
1491 return null;
1492 }
1493
1494
1495 /** Return a Mixer with a given name from a given MixerProvider.
1496 This method never requires the returned Mixer to do mixing.
1497 @param mixerName The name of the Mixer to be returned.
1498 @param provider The MixerProvider to check for Mixers.
1499 @param info The type of line the returned Mixer is required to
1500 support.
1501
1502 @return A Mixer matching the requirements, or null if none is found.
1503 */
1504 private static Mixer getNamedMixer(String mixerName,
1505 MixerProvider provider,
1506 Line.Info info) {
1509 if (infos[i].getName().equals(mixerName)) {
1510 Mixer mixer = provider.getMixer(infos[i]);
1511 if (isAppropriateMixer(mixer, info, false)) {
1512 return mixer;
1513 }
1514 }
1515 }
1516 return null;
1517 }
1518
1519
1520 /** From a List of MixerProviders, return a Mixer with a given name.
1521 This method never requires the returned Mixer to do mixing.
1522 @param mixerName The name of the Mixer to be returned.
1523 @param providers The List of MixerProviders to check for Mixers.
1524 @param info The type of line the returned Mixer is required to
1525 support.
1526 @return A Mixer matching the requirements, or null if none is found.
1527 */
1528 private static Mixer getNamedMixer(String mixerName,
1529 List providers,
1530 Line.Info info) {
1531 for(int i = 0; i < providers.size(); i++) {
1532 MixerProvider provider = (MixerProvider) providers.get(i);
1533 Mixer mixer = getNamedMixer(mixerName, provider, info);
1534 if (mixer != null) {
1535 return mixer;
1536 }
1537 }
1538 return null;
1539 }
1540
1541
1542 /** From a given MixerProvider, return the first appropriate Mixer.
1543 @param provider The MixerProvider to check for Mixers.
1544 @param info The type of line the returned Mixer is required to
1545 support.
1546 @param isMixingRequired If true, only Mixers that support mixing are
1547 returned for line types of SourceDataLine and Clip.
1548
1549 @return A Mixer that is considered appropriate, or null
1550 if none is found.
1551 */
1552 private static Mixer getFirstMixer(MixerProvider provider,
1561 }
1562 return null;
1563 }
1564
1565
1566 /** Checks if a Mixer is appropriate.
1567 A Mixer is considered appropriate if it support the given line type.
1568 If isMixingRequired is true and the line type is an output one
1569 (SourceDataLine, Clip), the mixer is appropriate if it supports
1570 at least 2 (concurrent) lines of the given type.
1571
1572 @return true if the mixer is considered appropriate according to the
1573 rules given above, false otherwise.
1574 */
1575 private static boolean isAppropriateMixer(Mixer mixer,
1576 Line.Info lineInfo,
1577 boolean isMixingRequired) {
1578 if (! mixer.isLineSupported(lineInfo)) {
1579 return false;
1580 }
1581 Class lineClass = lineInfo.getLineClass();
1582 if (isMixingRequired
1583 && (SourceDataLine.class.isAssignableFrom(lineClass) ||
1584 Clip.class.isAssignableFrom(lineClass))) {
1585 int maxLines = mixer.getMaxLines(lineInfo);
1586 return ((maxLines == NOT_SPECIFIED) || (maxLines > 1));
1587 }
1588 return true;
1589 }
1590
1591
1592
1593 /**
1594 * Like getMixerInfo, but return List
1595 */
1596 private static List getMixerInfoList() {
1597 List providers = getMixerProviders();
1598 return getMixerInfoList(providers);
1599 }
1600
1601
1602 /**
1603 * Like getMixerInfo, but return List
1604 */
1605 private static List getMixerInfoList(List providers) {
1606 List infos = new ArrayList();
1607
1608 Mixer.Info[] someInfos; // per-mixer
1609 Mixer.Info[] allInfos; // for all mixers
1610
1611 for(int i = 0; i < providers.size(); i++ ) {
1612 someInfos = ((MixerProvider)providers.get(i)).getMixerInfo();
1613
1614 for (int j = 0; j < someInfos.length; j++) {
1615 infos.add(someInfos[j]);
1616 }
1617 }
1618
1619 return infos;
1620 }
1621
1622
1623 /**
1624 * Obtains the set of services currently installed on the system
1625 * using the SPI mechanism in 1.3.
1626 * @return a List of instances of providers for the requested service.
1627 * If no providers are available, a vector of length 0 will be returned.
1628 */
1629 private static List getProviders(Class providerClass) {
1630 return JDK13Services.getProviders(providerClass);
1631 }
1632 }
|
179 * methods may also accept or return this value, as documented.
180 */
181 public static final int NOT_SPECIFIED = -1;
182
183 /**
184 * Private no-args constructor for ensuring against instantiation.
185 */
186 private AudioSystem() {
187 }
188
189
190 /**
191 * Obtains an array of mixer info objects that represents
192 * the set of audio mixers that are currently installed on the system.
193 * @return an array of info objects for the currently installed mixers. If no mixers
194 * are available on the system, an array of length 0 is returned.
195 * @see #getMixer
196 */
197 public static Mixer.Info[] getMixerInfo() {
198
199 List<Mixer.Info> infos = getMixerInfoList();
200 Mixer.Info[] allInfos = infos.toArray(new Mixer.Info[infos.size()]);
201 return allInfos;
202 }
203
204
205 /**
206 * Obtains the requested audio mixer.
207 * @param info a <code>Mixer.Info</code> object representing the desired
208 * mixer, or <code>null</code> for the system default mixer
209 * @return the requested mixer
210 * @throws SecurityException if the requested mixer
211 * is unavailable because of security restrictions
212 * @throws IllegalArgumentException if the info object does not represent
213 * a mixer installed on the system
214 * @see #getMixerInfo
215 */
216 public static Mixer getMixer(Mixer.Info info) {
217
218 Mixer mixer = null;
219 List<MixerProvider> providers = getMixerProviders();
220
221 for(int i = 0; i < providers.size(); i++ ) {
222
223 try {
224 return providers.get(i).getMixer(info);
225
226 } catch (IllegalArgumentException e) {
227 } catch (NullPointerException e) {
228 // $$jb 08.20.99: If the strings in the info object aren't
229 // set, then Netscape (using jdk1.1.5) tends to throw
230 // NPE's when doing some string manipulation. This is
231 // probably not the best fix, but is solves the problem
232 // of the NPE in Netscape using local classes
233 // $$jb 11.01.99: Replacing this patch.
234 }
235 }
236
237 //$$fb if looking for default mixer, and not found yet, add a round of looking
238 if (info == null) {
239 for(int i = 0; i < providers.size(); i++ ) {
240 try {
241 MixerProvider provider = providers.get(i);
242 Mixer.Info[] infos = provider.getMixerInfo();
243 // start from 0 to last device (do not reverse this order)
244 for (int ii = 0; ii < infos.length; ii++) {
245 try {
246 return provider.getMixer(infos[ii]);
247 } catch (IllegalArgumentException e) {
248 // this is not a good default device :)
249 }
250 }
251 } catch (IllegalArgumentException e) {
252 } catch (NullPointerException e) {
253 }
254 }
255 }
256
257
258 throw new IllegalArgumentException("Mixer not supported: "
259 + (info!=null?info.toString():"null"));
260 }
261
262
263 //$$fb 2002-11-26: fix for 4757930: DOC: AudioSystem.getTarget/SourceLineInfo() is ambiguous
264 /**
265 * Obtains information about all source lines of a particular type that are supported
266 * by the installed mixers.
267 * @param info a <code>Line.Info</code> object that specifies the kind of
268 * lines about which information is requested
269 * @return an array of <code>Line.Info</code> objects describing source lines matching
270 * the type requested. If no matching source lines are supported, an array of length 0
271 * is returned.
272 *
273 * @see Mixer#getSourceLineInfo(Line.Info)
274 */
275 public static Line.Info[] getSourceLineInfo(Line.Info info) {
276
277 Vector<Line.Info> vector = new Vector<>();
278 Line.Info[] currentInfoArray;
279
280 Mixer mixer;
281 Line.Info fullInfo = null;
282 Mixer.Info[] infoArray = getMixerInfo();
283
284 for (int i = 0; i < infoArray.length; i++) {
285
286 mixer = getMixer(infoArray[i]);
287
288 currentInfoArray = mixer.getSourceLineInfo(info);
289 for (int j = 0; j < currentInfoArray.length; j++) {
290 vector.addElement(currentInfoArray[j]);
291 }
292 }
293
294 Line.Info[] returnedArray = new Line.Info[vector.size()];
295
296 for (int i = 0; i < returnedArray.length; i++) {
297 returnedArray[i] = vector.get(i);
298 }
299
300 return returnedArray;
301 }
302
303
304 /**
305 * Obtains information about all target lines of a particular type that are supported
306 * by the installed mixers.
307 * @param info a <code>Line.Info</code> object that specifies the kind of
308 * lines about which information is requested
309 * @return an array of <code>Line.Info</code> objects describing target lines matching
310 * the type requested. If no matching target lines are supported, an array of length 0
311 * is returned.
312 *
313 * @see Mixer#getTargetLineInfo(Line.Info)
314 */
315 public static Line.Info[] getTargetLineInfo(Line.Info info) {
316
317 Vector<Line.Info> vector = new Vector<>();
318 Line.Info[] currentInfoArray;
319
320 Mixer mixer;
321 Line.Info fullInfo = null;
322 Mixer.Info[] infoArray = getMixerInfo();
323
324 for (int i = 0; i < infoArray.length; i++) {
325
326 mixer = getMixer(infoArray[i]);
327
328 currentInfoArray = mixer.getTargetLineInfo(info);
329 for (int j = 0; j < currentInfoArray.length; j++) {
330 vector.addElement(currentInfoArray[j]);
331 }
332 }
333
334 Line.Info[] returnedArray = new Line.Info[vector.size()];
335
336 for (int i = 0; i < returnedArray.length; i++) {
337 returnedArray[i] = vector.get(i);
338 }
339
340 return returnedArray;
341 }
342
343
344 /**
345 * Indicates whether the system supports any lines that match
346 * the specified <code>Line.Info</code> object. A line is supported if
347 * any installed mixer supports it.
348 * @param info a <code>Line.Info</code> object describing the line for which support is queried
349 * @return <code>true</code> if at least one matching line is
350 * supported, otherwise <code>false</code>
351 *
352 * @see Mixer#isLineSupported(Line.Info)
353 */
354 public static boolean isLineSupported(Line.Info info) {
355
356 Mixer mixer;
357 Mixer.Info[] infoArray = getMixerInfo();
391 * If the respective property is not set, or the mixer
392 * requested in the property is not installed or does not provide the
393 * requested line, all installed mixers are queried for the
394 * requested line type. A Line will be returned from the first mixer
395 * providing the requested line type.
396 *
397 * @param info a <code>Line.Info</code> object describing the desired kind of line
398 * @return a line of the requested kind
399 *
400 * @throws LineUnavailableException if a matching line
401 * is not available due to resource restrictions
402 * @throws SecurityException if a matching line
403 * is not available due to security restrictions
404 * @throws IllegalArgumentException if the system does not
405 * support at least one line matching the specified
406 * <code>Line.Info</code> object
407 * through any installed mixer
408 */
409 public static Line getLine(Line.Info info) throws LineUnavailableException {
410 LineUnavailableException lue = null;
411 List<MixerProvider> providers = getMixerProviders();
412
413
414 // 1: try from default mixer for this line class
415 try {
416 Mixer mixer = getDefaultMixer(providers, info);
417 if (mixer != null && mixer.isLineSupported(info)) {
418 return mixer.getLine(info);
419 }
420 } catch (LineUnavailableException e) {
421 lue = e;
422 } catch (IllegalArgumentException iae) {
423 // must not happen... but better to catch it here,
424 // if plug-ins are badly written
425 }
426
427
428 // 2: if that doesn't work, try to find any mixing mixer
429 for(int i = 0; i < providers.size(); i++) {
430 MixerProvider provider = providers.get(i);
431 Mixer.Info[] infos = provider.getMixerInfo();
432
433 for (int j = 0; j < infos.length; j++) {
434 try {
435 Mixer mixer = provider.getMixer(infos[j]);
436 // see if this is an appropriate mixer which can mix
437 if (isAppropriateMixer(mixer, info, true)) {
438 return mixer.getLine(info);
439 }
440 } catch (LineUnavailableException e) {
441 lue = e;
442 } catch (IllegalArgumentException iae) {
443 // must not happen... but better to catch it here,
444 // if plug-ins are badly written
445 }
446 }
447 }
448
449
450 // 3: if that didn't work, try to find any non-mixing mixer
451 for(int i = 0; i < providers.size(); i++) {
452 MixerProvider provider = providers.get(i);
453 Mixer.Info[] infos = provider.getMixerInfo();
454 for (int j = 0; j < infos.length; j++) {
455 try {
456 Mixer mixer = provider.getMixer(infos[j]);
457 // see if this is an appropriate mixer which can mix
458 if (isAppropriateMixer(mixer, info, false)) {
459 return mixer.getLine(info);
460 }
461 } catch (LineUnavailableException e) {
462 lue = e;
463 } catch (IllegalArgumentException iae) {
464 // must not happen... but better to catch it here,
465 // if plug-ins are badly written
466 }
467 }
468 }
469
470 // if this line was supported but was not available, throw the last
471 // LineUnavailableException we got (??).
472 if (lue != null) {
747
748 DataLine.Info info = new DataLine.Info(TargetDataLine.class, format);
749 Mixer mixer = AudioSystem.getMixer(mixerinfo);
750 return (TargetDataLine) mixer.getLine(info);
751 }
752
753
754 // $$fb 2002-04-12: fix for 4662082: behavior of AudioSystem.getTargetEncodings() methods doesn't match the spec
755 /**
756 * Obtains the encodings that the system can obtain from an
757 * audio input stream with the specified encoding using the set
758 * of installed format converters.
759 * @param sourceEncoding the encoding for which conversion support
760 * is queried
761 * @return array of encodings. If <code>sourceEncoding</code>is not supported,
762 * an array of length 0 is returned. Otherwise, the array will have a length
763 * of at least 1, representing <code>sourceEncoding</code> (no conversion).
764 */
765 public static AudioFormat.Encoding[] getTargetEncodings(AudioFormat.Encoding sourceEncoding) {
766
767 List<FormatConversionProvider> codecs = getFormatConversionProviders();
768 Vector<AudioFormat.Encoding> encodings = new Vector<>();
769
770 AudioFormat.Encoding encs[] = null;
771
772 // gather from all the codecs
773 for(int i=0; i<codecs.size(); i++ ) {
774 FormatConversionProvider codec = codecs.get(i);
775 if( codec.isSourceEncodingSupported( sourceEncoding ) ) {
776 encs = codec.getTargetEncodings();
777 for (int j = 0; j < encs.length; j++) {
778 encodings.addElement( encs[j] );
779 }
780 }
781 }
782 AudioFormat.Encoding encs2[] = encodings.toArray(new AudioFormat.Encoding[0]);
783 return encs2;
784 }
785
786
787
788 // $$fb 2002-04-12: fix for 4662082: behavior of AudioSystem.getTargetEncodings() methods doesn't match the spec
789 /**
790 * Obtains the encodings that the system can obtain from an
791 * audio input stream with the specified format using the set
792 * of installed format converters.
793 * @param sourceFormat the audio format for which conversion
794 * is queried
795 * @return array of encodings. If <code>sourceFormat</code>is not supported,
796 * an array of length 0 is returned. Otherwise, the array will have a length
797 * of at least 1, representing the encoding of <code>sourceFormat</code> (no conversion).
798 */
799 public static AudioFormat.Encoding[] getTargetEncodings(AudioFormat sourceFormat) {
800
801
802 List<FormatConversionProvider> codecs = getFormatConversionProviders();
803 Vector<AudioFormat.Encoding[]> encodings = new Vector<>();
804
805 int size = 0;
806 int index = 0;
807 AudioFormat.Encoding encs[] = null;
808
809 // gather from all the codecs
810
811 for(int i=0; i<codecs.size(); i++ ) {
812 encs = codecs.get(i).getTargetEncodings(sourceFormat);
813 size += encs.length;
814 encodings.addElement( encs );
815 }
816
817 // now build a new array
818
819 AudioFormat.Encoding encs2[] = new AudioFormat.Encoding[size];
820 for(int i=0; i<encodings.size(); i++ ) {
821 encs = encodings.get(i);
822 for(int j=0; j<encs.length; j++ ) {
823 encs2[index++] = encs[j];
824 }
825 }
826 return encs2;
827 }
828
829
830 /**
831 * Indicates whether an audio input stream of the specified encoding
832 * can be obtained from an audio input stream that has the specified
833 * format.
834 * @param targetEncoding the desired encoding after conversion
835 * @param sourceFormat the audio format before conversion
836 * @return <code>true</code> if the conversion is supported,
837 * otherwise <code>false</code>
838 */
839 public static boolean isConversionSupported(AudioFormat.Encoding targetEncoding, AudioFormat sourceFormat) {
840
841
842 List<FormatConversionProvider> codecs = getFormatConversionProviders();
843
844 for(int i=0; i<codecs.size(); i++ ) {
845 FormatConversionProvider codec = codecs.get(i);
846 if(codec.isConversionSupported(targetEncoding,sourceFormat) ) {
847 return true;
848 }
849 }
850 return false;
851 }
852
853
854 /**
855 * Obtains an audio input stream of the indicated encoding, by converting the
856 * provided audio input stream.
857 * @param targetEncoding the desired encoding after conversion
858 * @param sourceStream the stream to be converted
859 * @return an audio input stream of the indicated encoding
860 * @throws IllegalArgumentException if the conversion is not supported
861 * @see #getTargetEncodings(AudioFormat.Encoding)
862 * @see #getTargetEncodings(AudioFormat)
863 * @see #isConversionSupported(AudioFormat.Encoding, AudioFormat)
864 * @see #getAudioInputStream(AudioFormat, AudioInputStream)
865 */
866 public static AudioInputStream getAudioInputStream(AudioFormat.Encoding targetEncoding,
867 AudioInputStream sourceStream) {
868
869 List<FormatConversionProvider> codecs = getFormatConversionProviders();
870
871 for(int i = 0; i < codecs.size(); i++) {
872 FormatConversionProvider codec = codecs.get(i);
873 if( codec.isConversionSupported( targetEncoding, sourceStream.getFormat() ) ) {
874 return codec.getAudioInputStream( targetEncoding, sourceStream );
875 }
876 }
877 // we ran out of options, throw an exception
878 throw new IllegalArgumentException("Unsupported conversion: " + targetEncoding + " from " + sourceStream.getFormat());
879 }
880
881
882 /**
883 * Obtains the formats that have a particular encoding and that the system can
884 * obtain from a stream of the specified format using the set of
885 * installed format converters.
886 * @param targetEncoding the desired encoding after conversion
887 * @param sourceFormat the audio format before conversion
888 * @return array of formats. If no formats of the specified
889 * encoding are supported, an array of length 0 is returned.
890 */
891 public static AudioFormat[] getTargetFormats(AudioFormat.Encoding targetEncoding, AudioFormat sourceFormat) {
892
893 List<FormatConversionProvider> codecs = getFormatConversionProviders();
894 Vector<AudioFormat[]> formats = new Vector<>();
895
896 int size = 0;
897 int index = 0;
898 AudioFormat fmts[] = null;
899
900 // gather from all the codecs
901
902 for(int i=0; i<codecs.size(); i++ ) {
903 FormatConversionProvider codec = codecs.get(i);
904 fmts = codec.getTargetFormats(targetEncoding, sourceFormat);
905 size += fmts.length;
906 formats.addElement( fmts );
907 }
908
909 // now build a new array
910
911 AudioFormat fmts2[] = new AudioFormat[size];
912 for(int i=0; i<formats.size(); i++ ) {
913 fmts = formats.get(i);
914 for(int j=0; j<fmts.length; j++ ) {
915 fmts2[index++] = fmts[j];
916 }
917 }
918 return fmts2;
919 }
920
921
922 /**
923 * Indicates whether an audio input stream of a specified format
924 * can be obtained from an audio input stream of another specified format.
925 * @param targetFormat the desired audio format after conversion
926 * @param sourceFormat the audio format before conversion
927 * @return <code>true</code> if the conversion is supported,
928 * otherwise <code>false</code>
929 */
930
931 public static boolean isConversionSupported(AudioFormat targetFormat, AudioFormat sourceFormat) {
932
933 List<FormatConversionProvider> codecs = getFormatConversionProviders();
934
935 for(int i=0; i<codecs.size(); i++ ) {
936 FormatConversionProvider codec = codecs.get(i);
937 if(codec.isConversionSupported(targetFormat, sourceFormat) ) {
938 return true;
939 }
940 }
941 return false;
942 }
943
944
945 /**
946 * Obtains an audio input stream of the indicated format, by converting the
947 * provided audio input stream.
948 * @param targetFormat the desired audio format after conversion
949 * @param sourceStream the stream to be converted
950 * @return an audio input stream of the indicated format
951 * @throws IllegalArgumentException if the conversion is not supported
952 * #see #getTargetEncodings(AudioFormat)
953 * @see #getTargetFormats(AudioFormat.Encoding, AudioFormat)
954 * @see #isConversionSupported(AudioFormat, AudioFormat)
955 * @see #getAudioInputStream(AudioFormat.Encoding, AudioInputStream)
956 */
957 public static AudioInputStream getAudioInputStream(AudioFormat targetFormat,
958 AudioInputStream sourceStream) {
959
960 if (sourceStream.getFormat().matches(targetFormat)) {
961 return sourceStream;
962 }
963
964 List<FormatConversionProvider> codecs = getFormatConversionProviders();
965
966 for(int i = 0; i < codecs.size(); i++) {
967 FormatConversionProvider codec = codecs.get(i);
968 if(codec.isConversionSupported(targetFormat,sourceStream.getFormat()) ) {
969 return codec.getAudioInputStream(targetFormat,sourceStream);
970 }
971 }
972
973 // we ran out of options...
974 throw new IllegalArgumentException("Unsupported conversion: " + targetFormat + " from " + sourceStream.getFormat());
975 }
976
977
978 /**
979 * Obtains the audio file format of the provided input stream. The stream must
980 * point to valid audio file data. The implementation of this method may require
981 * multiple parsers to examine the stream to determine whether they support it.
982 * These parsers must be able to mark the stream, read enough data to determine whether they
983 * support the stream, and, if not, reset the stream's read pointer to its original
984 * position. If the input stream does not support these operations, this method may fail
985 * with an <code>IOException</code>.
986 * @param stream the input stream from which file format information should be
987 * extracted
988 * @return an <code>AudioFileFormat</code> object describing the stream's audio file format
989 * @throws UnsupportedAudioFileException if the stream does not point to valid audio
990 * file data recognized by the system
991 * @throws IOException if an input/output exception occurs
992 * @see InputStream#markSupported
993 * @see InputStream#mark
994 */
995 public static AudioFileFormat getAudioFileFormat(InputStream stream)
996 throws UnsupportedAudioFileException, IOException {
997
998 List<AudioFileReader> providers = getAudioFileReaders();
999 AudioFileFormat format = null;
1000
1001 for(int i = 0; i < providers.size(); i++ ) {
1002 AudioFileReader reader = providers.get(i);
1003 try {
1004 format = reader.getAudioFileFormat( stream ); // throws IOException
1005 break;
1006 } catch (UnsupportedAudioFileException e) {
1007 continue;
1008 }
1009 }
1010
1011 if( format==null ) {
1012 throw new UnsupportedAudioFileException("file is not a supported file type");
1013 } else {
1014 return format;
1015 }
1016 }
1017
1018 /**
1019 * Obtains the audio file format of the specified URL. The URL must
1020 * point to valid audio file data.
1021 * @param url the URL from which file format information should be
1022 * extracted
1023 * @return an <code>AudioFileFormat</code> object describing the audio file format
1024 * @throws UnsupportedAudioFileException if the URL does not point to valid audio
1025 * file data recognized by the system
1026 * @throws IOException if an input/output exception occurs
1027 */
1028 public static AudioFileFormat getAudioFileFormat(URL url)
1029 throws UnsupportedAudioFileException, IOException {
1030
1031 List<AudioFileReader> providers = getAudioFileReaders();
1032 AudioFileFormat format = null;
1033
1034 for(int i = 0; i < providers.size(); i++ ) {
1035 AudioFileReader reader = providers.get(i);
1036 try {
1037 format = reader.getAudioFileFormat( url ); // throws IOException
1038 break;
1039 } catch (UnsupportedAudioFileException e) {
1040 continue;
1041 }
1042 }
1043
1044 if( format==null ) {
1045 throw new UnsupportedAudioFileException("file is not a supported file type");
1046 } else {
1047 return format;
1048 }
1049 }
1050
1051 /**
1052 * Obtains the audio file format of the specified <code>File</code>. The <code>File</code> must
1053 * point to valid audio file data.
1054 * @param file the <code>File</code> from which file format information should be
1055 * extracted
1056 * @return an <code>AudioFileFormat</code> object describing the audio file format
1057 * @throws UnsupportedAudioFileException if the <code>File</code> does not point to valid audio
1058 * file data recognized by the system
1059 * @throws IOException if an I/O exception occurs
1060 */
1061 public static AudioFileFormat getAudioFileFormat(File file)
1062 throws UnsupportedAudioFileException, IOException {
1063
1064 List<AudioFileReader> providers = getAudioFileReaders();
1065 AudioFileFormat format = null;
1066
1067 for(int i = 0; i < providers.size(); i++ ) {
1068 AudioFileReader reader = providers.get(i);
1069 try {
1070 format = reader.getAudioFileFormat( file ); // throws IOException
1071 break;
1072 } catch (UnsupportedAudioFileException e) {
1073 continue;
1074 }
1075 }
1076
1077 if( format==null ) {
1078 throw new UnsupportedAudioFileException("file is not a supported file type");
1079 } else {
1080 return format;
1081 }
1082 }
1083
1084
1085 /**
1086 * Obtains an audio input stream from the provided input stream. The stream must
1087 * point to valid audio file data. The implementation of this method may
1088 * require multiple parsers to
1089 * examine the stream to determine whether they support it. These parsers must
1090 * be able to mark the stream, read enough data to determine whether they
1091 * support the stream, and, if not, reset the stream's read pointer to its original
1092 * position. If the input stream does not support these operation, this method may fail
1093 * with an <code>IOExcEption</code>.
1094 * @param stream the input stream from which the <code>AudioInputStream</code> should be
1095 * constructed
1096 * @return an <code>AudioInputStream</code> object based on the audio file data contained
1097 * in the input stream.
1098 * @throws UnsupportedAudioFileException if the stream does not point to valid audio
1099 * file data recognized by the system
1100 * @throws IOException if an I/O exception occurs
1101 * @see InputStream#markSupported
1102 * @see InputStream#mark
1103 */
1104 public static AudioInputStream getAudioInputStream(InputStream stream)
1105 throws UnsupportedAudioFileException, IOException {
1106
1107 List<AudioFileReader> providers = getAudioFileReaders();
1108 AudioInputStream audioStream = null;
1109
1110 for(int i = 0; i < providers.size(); i++ ) {
1111 AudioFileReader reader = providers.get(i);
1112 try {
1113 audioStream = reader.getAudioInputStream( stream ); // throws IOException
1114 break;
1115 } catch (UnsupportedAudioFileException e) {
1116 continue;
1117 }
1118 }
1119
1120 if( audioStream==null ) {
1121 throw new UnsupportedAudioFileException("could not get audio input stream from input stream");
1122 } else {
1123 return audioStream;
1124 }
1125 }
1126
1127 /**
1128 * Obtains an audio input stream from the URL provided. The URL must
1129 * point to valid audio file data.
1130 * @param url the URL for which the <code>AudioInputStream</code> should be
1131 * constructed
1132 * @return an <code>AudioInputStream</code> object based on the audio file data pointed
1133 * to by the URL
1134 * @throws UnsupportedAudioFileException if the URL does not point to valid audio
1135 * file data recognized by the system
1136 * @throws IOException if an I/O exception occurs
1137 */
1138 public static AudioInputStream getAudioInputStream(URL url)
1139 throws UnsupportedAudioFileException, IOException {
1140
1141 List<AudioFileReader> providers = getAudioFileReaders();
1142 AudioInputStream audioStream = null;
1143
1144 for(int i = 0; i < providers.size(); i++ ) {
1145 AudioFileReader reader = providers.get(i);
1146 try {
1147 audioStream = reader.getAudioInputStream( url ); // throws IOException
1148 break;
1149 } catch (UnsupportedAudioFileException e) {
1150 continue;
1151 }
1152 }
1153
1154 if( audioStream==null ) {
1155 throw new UnsupportedAudioFileException("could not get audio input stream from input URL");
1156 } else {
1157 return audioStream;
1158 }
1159 }
1160
1161 /**
1162 * Obtains an audio input stream from the provided <code>File</code>. The <code>File</code> must
1163 * point to valid audio file data.
1164 * @param file the <code>File</code> for which the <code>AudioInputStream</code> should be
1165 * constructed
1166 * @return an <code>AudioInputStream</code> object based on the audio file data pointed
1167 * to by the <code>File</code>
1168 * @throws UnsupportedAudioFileException if the <code>File</code> does not point to valid audio
1169 * file data recognized by the system
1170 * @throws IOException if an I/O exception occurs
1171 */
1172 public static AudioInputStream getAudioInputStream(File file)
1173 throws UnsupportedAudioFileException, IOException {
1174
1175 List<AudioFileReader> providers = getAudioFileReaders();
1176 AudioInputStream audioStream = null;
1177
1178 for(int i = 0; i < providers.size(); i++ ) {
1179 AudioFileReader reader = providers.get(i);
1180 try {
1181 audioStream = reader.getAudioInputStream( file ); // throws IOException
1182 break;
1183 } catch (UnsupportedAudioFileException e) {
1184 continue;
1185 }
1186 }
1187
1188 if( audioStream==null ) {
1189 throw new UnsupportedAudioFileException("could not get audio input stream from input file");
1190 } else {
1191 return audioStream;
1192 }
1193 }
1194
1195
1196 /**
1197 * Obtains the file types for which file writing support is provided by the system.
1198 * @return array of unique file types. If no file types are supported,
1199 * an array of length 0 is returned.
1200 */
1201 public static AudioFileFormat.Type[] getAudioFileTypes() {
1202 List<AudioFileWriter> providers = getAudioFileWriters();
1203 Set<AudioFileFormat.Type> returnTypesSet = new HashSet<>();
1204
1205 for(int i=0; i < providers.size(); i++) {
1206 AudioFileWriter writer = providers.get(i);
1207 AudioFileFormat.Type[] fileTypes = writer.getAudioFileTypes();
1208 for(int j=0; j < fileTypes.length; j++) {
1209 returnTypesSet.add(fileTypes[j]);
1210 }
1211 }
1212 AudioFileFormat.Type returnTypes[] =
1213 returnTypesSet.toArray(new AudioFileFormat.Type[0]);
1214 return returnTypes;
1215 }
1216
1217
1218 /**
1219 * Indicates whether file writing support for the specified file type is provided
1220 * by the system.
1221 * @param fileType the file type for which write capabilities are queried
1222 * @return <code>true</code> if the file type is supported,
1223 * otherwise <code>false</code>
1224 */
1225 public static boolean isFileTypeSupported(AudioFileFormat.Type fileType) {
1226
1227 List<AudioFileWriter> providers = getAudioFileWriters();
1228
1229 for(int i=0; i < providers.size(); i++) {
1230 AudioFileWriter writer = providers.get(i);
1231 if (writer.isFileTypeSupported(fileType)) {
1232 return true;
1233 }
1234 }
1235 return false;
1236 }
1237
1238
1239 /**
1240 * Obtains the file types that the system can write from the
1241 * audio input stream specified.
1242 * @param stream the audio input stream for which audio file type support
1243 * is queried
1244 * @return array of file types. If no file types are supported,
1245 * an array of length 0 is returned.
1246 */
1247 public static AudioFileFormat.Type[] getAudioFileTypes(AudioInputStream stream) {
1248 List<AudioFileWriter> providers = getAudioFileWriters();
1249 Set<AudioFileFormat.Type> returnTypesSet = new HashSet<>();
1250
1251 for(int i=0; i < providers.size(); i++) {
1252 AudioFileWriter writer = providers.get(i);
1253 AudioFileFormat.Type[] fileTypes = writer.getAudioFileTypes(stream);
1254 for(int j=0; j < fileTypes.length; j++) {
1255 returnTypesSet.add(fileTypes[j]);
1256 }
1257 }
1258 AudioFileFormat.Type returnTypes[] =
1259 returnTypesSet.toArray(new AudioFileFormat.Type[0]);
1260 return returnTypes;
1261 }
1262
1263
1264 /**
1265 * Indicates whether an audio file of the specified file type can be written
1266 * from the indicated audio input stream.
1267 * @param fileType the file type for which write capabilities are queried
1268 * @param stream the stream for which file-writing support is queried
1269 * @return <code>true</code> if the file type is supported for this audio input stream,
1270 * otherwise <code>false</code>
1271 */
1272 public static boolean isFileTypeSupported(AudioFileFormat.Type fileType,
1273 AudioInputStream stream) {
1274
1275 List<AudioFileWriter> providers = getAudioFileWriters();
1276
1277 for(int i=0; i < providers.size(); i++) {
1278 AudioFileWriter writer = providers.get(i);
1279 if(writer.isFileTypeSupported(fileType, stream)) {
1280 return true;
1281 }
1282 }
1283 return false;
1284 }
1285
1286
1287 /**
1288 * Writes a stream of bytes representing an audio file of the specified file type
1289 * to the output stream provided. Some file types require that
1290 * the length be written into the file header; such files cannot be written from
1291 * start to finish unless the length is known in advance. An attempt
1292 * to write a file of such a type will fail with an IOException if the length in
1293 * the audio file type is <code>AudioSystem.NOT_SPECIFIED</code>.
1294 *
1295 * @param stream the audio input stream containing audio data to be
1296 * written to the file
1297 * @param fileType the kind of audio file to write
1298 * @param out the stream to which the file data should be written
1299 * @return the number of bytes written to the output stream
1300 * @throws IOException if an input/output exception occurs
1301 * @throws IllegalArgumentException if the file type is not supported by
1302 * the system
1303 * @see #isFileTypeSupported
1304 * @see #getAudioFileTypes
1305 */
1306 public static int write(AudioInputStream stream, AudioFileFormat.Type fileType,
1307 OutputStream out) throws IOException {
1308
1309 List<AudioFileWriter> providers = getAudioFileWriters();
1310 int bytesWritten = 0;
1311 boolean flag = false;
1312
1313 for(int i=0; i < providers.size(); i++) {
1314 AudioFileWriter writer = providers.get(i);
1315 try {
1316 bytesWritten = writer.write( stream, fileType, out ); // throws IOException
1317 flag = true;
1318 break;
1319 } catch (IllegalArgumentException e) {
1320 // thrown if this provider cannot write the sequence, try the next
1321 continue;
1322 }
1323 }
1324 if(!flag) {
1325 throw new IllegalArgumentException("could not write audio file: file type not supported: " + fileType);
1326 } else {
1327 return bytesWritten;
1328 }
1329 }
1330
1331
1332 /**
1333 * Writes a stream of bytes representing an audio file of the specified file type
1334 * to the external file provided.
1335 * @param stream the audio input stream containing audio data to be
1336 * written to the file
1337 * @param fileType the kind of audio file to write
1338 * @param out the external file to which the file data should be written
1339 * @return the number of bytes written to the file
1340 * @throws IOException if an I/O exception occurs
1341 * @throws IllegalArgumentException if the file type is not supported by
1342 * the system
1343 * @see #isFileTypeSupported
1344 * @see #getAudioFileTypes
1345 */
1346 public static int write(AudioInputStream stream, AudioFileFormat.Type fileType,
1347 File out) throws IOException {
1348
1349 List<AudioFileWriter> providers = getAudioFileWriters();
1350 int bytesWritten = 0;
1351 boolean flag = false;
1352
1353 for(int i=0; i < providers.size(); i++) {
1354 AudioFileWriter writer = providers.get(i);
1355 try {
1356 bytesWritten = writer.write( stream, fileType, out ); // throws IOException
1357 flag = true;
1358 break;
1359 } catch (IllegalArgumentException e) {
1360 // thrown if this provider cannot write the sequence, try the next
1361 continue;
1362 }
1363 }
1364 if (!flag) {
1365 throw new IllegalArgumentException("could not write audio file: file type not supported: " + fileType);
1366 } else {
1367 return bytesWritten;
1368 }
1369 }
1370
1371
1372 // METHODS FOR INTERNAL IMPLEMENTATION USE
1373
1374 /**
1375 * Obtains the set of MixerProviders on the system.
1376 */
1377 @SuppressWarnings("unchecked")
1378 private static List<MixerProvider> getMixerProviders() {
1379 return (List<MixerProvider>) getProviders(MixerProvider.class);
1380 }
1381
1382
1383 /**
1384 * Obtains the set of format converters (codecs, transcoders, etc.)
1385 * that are currently installed on the system.
1386 * @return an array of
1387 * {@link javax.sound.sampled.spi.FormatConversionProvider
1388 * FormatConversionProvider}
1389 * objects representing the available format converters. If no format
1390 * converters readers are available on the system, an array of length 0 is
1391 * returned.
1392 */
1393 @SuppressWarnings("unchecked")
1394 private static List<FormatConversionProvider> getFormatConversionProviders() {
1395 return (List<FormatConversionProvider>) getProviders(FormatConversionProvider.class);
1396 }
1397
1398
1399 /**
1400 * Obtains the set of audio file readers that are currently installed on the system.
1401 * @return a List of
1402 * {@link javax.sound.sampled.spi.AudioFileReader
1403 * AudioFileReader}
1404 * objects representing the installed audio file readers. If no audio file
1405 * readers are available on the system, an empty List is returned.
1406 */
1407 @SuppressWarnings("unchecked")
1408 private static List<AudioFileReader> getAudioFileReaders() {
1409 return (List<AudioFileReader>)getProviders(AudioFileReader.class);
1410 }
1411
1412
1413 /**
1414 * Obtains the set of audio file writers that are currently installed on the system.
1415 * @return a List of
1416 * {@link javax.sound.samples.spi.AudioFileWriter AudioFileWriter}
1417 * objects representing the available audio file writers. If no audio file
1418 * writers are available on the system, an empty List is returned.
1419 */
1420 @SuppressWarnings("unchecked")
1421 private static List<AudioFileWriter> getAudioFileWriters() {
1422 return (List<AudioFileWriter>)getProviders(AudioFileWriter.class);
1423 }
1424
1425
1426
1427 /** Attempts to locate and return a default Mixer that provides lines
1428 * of the specified type.
1429 *
1430 * @param providers the installed mixer providers
1431 * @param info The requested line type
1432 * TargetDataLine.class, Clip.class or Port.class.
1433 * @return a Mixer that matches the requirements, or null if no default mixer found
1434 */
1435 private static Mixer getDefaultMixer(List<MixerProvider> providers, Line.Info info) {
1436 Class<?> lineClass = info.getLineClass();
1437 String providerClassName = JDK13Services.getDefaultProviderClassName(lineClass);
1438 String instanceName = JDK13Services.getDefaultInstanceName(lineClass);
1439 Mixer mixer;
1440
1441 if (providerClassName != null) {
1442 MixerProvider defaultProvider = getNamedProvider(providerClassName, providers);
1443 if (defaultProvider != null) {
1444 if (instanceName != null) {
1445 mixer = getNamedMixer(instanceName, defaultProvider, info);
1446 if (mixer != null) {
1447 return mixer;
1448 }
1449 } else {
1450 mixer = getFirstMixer(defaultProvider, info,
1451 false /* mixing not required*/);
1452 if (mixer != null) {
1453 return mixer;
1454 }
1455 }
1456
1468 }
1469
1470
1471 /* No default are specified, or if something is specified, everything
1472 failed. */
1473 return null;
1474 }
1475
1476
1477
1478 /** Return a MixerProvider of a given class from the list of
1479 MixerProviders.
1480
1481 This method never requires the returned Mixer to do mixing.
1482 @param providerClassName The class name of the provider to be returned.
1483 @param providers The list of MixerProviders that is searched.
1484 @return A MixerProvider of the requested class, or null if none is
1485 found.
1486 */
1487 private static MixerProvider getNamedProvider(String providerClassName,
1488 List<MixerProvider> providers) {
1489 for(int i = 0; i < providers.size(); i++) {
1490 MixerProvider provider = providers.get(i);
1491 if (provider.getClass().getName().equals(providerClassName)) {
1492 return provider;
1493 }
1494 }
1495 return null;
1496 }
1497
1498
1499 /** Return a Mixer with a given name from a given MixerProvider.
1500 This method never requires the returned Mixer to do mixing.
1501 @param mixerName The name of the Mixer to be returned.
1502 @param provider The MixerProvider to check for Mixers.
1503 @param info The type of line the returned Mixer is required to
1504 support.
1505
1506 @return A Mixer matching the requirements, or null if none is found.
1507 */
1508 private static Mixer getNamedMixer(String mixerName,
1509 MixerProvider provider,
1510 Line.Info info) {
1513 if (infos[i].getName().equals(mixerName)) {
1514 Mixer mixer = provider.getMixer(infos[i]);
1515 if (isAppropriateMixer(mixer, info, false)) {
1516 return mixer;
1517 }
1518 }
1519 }
1520 return null;
1521 }
1522
1523
1524 /** From a List of MixerProviders, return a Mixer with a given name.
1525 This method never requires the returned Mixer to do mixing.
1526 @param mixerName The name of the Mixer to be returned.
1527 @param providers The List of MixerProviders to check for Mixers.
1528 @param info The type of line the returned Mixer is required to
1529 support.
1530 @return A Mixer matching the requirements, or null if none is found.
1531 */
1532 private static Mixer getNamedMixer(String mixerName,
1533 List<MixerProvider> providers,
1534 Line.Info info) {
1535 for(int i = 0; i < providers.size(); i++) {
1536 MixerProvider provider = providers.get(i);
1537 Mixer mixer = getNamedMixer(mixerName, provider, info);
1538 if (mixer != null) {
1539 return mixer;
1540 }
1541 }
1542 return null;
1543 }
1544
1545
1546 /** From a given MixerProvider, return the first appropriate Mixer.
1547 @param provider The MixerProvider to check for Mixers.
1548 @param info The type of line the returned Mixer is required to
1549 support.
1550 @param isMixingRequired If true, only Mixers that support mixing are
1551 returned for line types of SourceDataLine and Clip.
1552
1553 @return A Mixer that is considered appropriate, or null
1554 if none is found.
1555 */
1556 private static Mixer getFirstMixer(MixerProvider provider,
1565 }
1566 return null;
1567 }
1568
1569
1570 /** Checks if a Mixer is appropriate.
1571 A Mixer is considered appropriate if it support the given line type.
1572 If isMixingRequired is true and the line type is an output one
1573 (SourceDataLine, Clip), the mixer is appropriate if it supports
1574 at least 2 (concurrent) lines of the given type.
1575
1576 @return true if the mixer is considered appropriate according to the
1577 rules given above, false otherwise.
1578 */
1579 private static boolean isAppropriateMixer(Mixer mixer,
1580 Line.Info lineInfo,
1581 boolean isMixingRequired) {
1582 if (! mixer.isLineSupported(lineInfo)) {
1583 return false;
1584 }
1585 Class<?> lineClass = lineInfo.getLineClass();
1586 if (isMixingRequired
1587 && (SourceDataLine.class.isAssignableFrom(lineClass) ||
1588 Clip.class.isAssignableFrom(lineClass))) {
1589 int maxLines = mixer.getMaxLines(lineInfo);
1590 return ((maxLines == NOT_SPECIFIED) || (maxLines > 1));
1591 }
1592 return true;
1593 }
1594
1595
1596
1597 /**
1598 * Like getMixerInfo, but return List
1599 */
1600 private static List<Mixer.Info> getMixerInfoList() {
1601 List<MixerProvider> providers = getMixerProviders();
1602 return getMixerInfoList(providers);
1603 }
1604
1605
1606 /**
1607 * Like getMixerInfo, but return List
1608 */
1609 private static List<Mixer.Info> getMixerInfoList(List<MixerProvider> providers) {
1610 List<Mixer.Info> infos = new ArrayList<>();
1611
1612 Mixer.Info[] someInfos; // per-mixer
1613 Mixer.Info[] allInfos; // for all mixers
1614
1615 for(int i = 0; i < providers.size(); i++ ) {
1616 someInfos = providers.get(i).getMixerInfo();
1617
1618 for (int j = 0; j < someInfos.length; j++) {
1619 infos.add(someInfos[j]);
1620 }
1621 }
1622
1623 return infos;
1624 }
1625
1626
1627 /**
1628 * Obtains the set of services currently installed on the system
1629 * using the SPI mechanism in 1.3.
1630 * @return a List of instances of providers for the requested service.
1631 * If no providers are available, a vector of length 0 will be returned.
1632 */
1633 private static List<?> getProviders(Class<?> providerClass) {
1634 return JDK13Services.getProviders(providerClass);
1635 }
1636 }
|