我已经看到多个有关MP3流（例如Icecast）的堆栈溢出问题。他们都说我使用的是MP3SPI库。MP3SPI用于允许支持audio/mpegmime类型。那就是我的Icecast流。我在类路径中正确地拥有了所有三个jar文件，但是在使用它们在示例中提供的相同代码时，我仍然得到了UnsupportedAudioFileException：
audio/mpeg
UnsupportedAudioFileException
javax.sound.sampled.UnsupportedAudioFileException: could not get audio input str eam from input URL at javax.sound.sampled.AudioSystem.getAudioInputStream(AudioSystem.java: 1153) at DJUtils.testPlay(DJUtils.java:16) at DJ.play(DJ.java:13) at DJ.init(DJ.java:4) at Loader.main(Loader.java:69)
这是我的代码：
public static void testPlay(){ try { AudioInputStream in= AudioSystem.getAudioInputStream(new URL("http://localhost:8000/listen.m3u")); AudioInputStream din = null; AudioFormat baseFormat = in.getFormat(); AudioFormat decodedFormat = new AudioFormat(AudioFormat.Encoding.PCM_SIGNED, baseFormat.getSampleRate(), 16, baseFormat.getChannels(), baseFormat.getChannels() * 2, baseFormat.getSampleRate(), false); din = AudioSystem.getAudioInputStream(decodedFormat, in); // Play now. rawplay(decodedFormat, din); in.close(); } catch (Exception e){ e.printStackTrace(); } } private static void rawplay(AudioFormat targetFormat, AudioInputStream din) throws LineUnavailableException, IOException{ try{ byte[] data = new byte[4096]; SourceDataLine line = getLine(targetFormat); if (line != null) { // Start line.start(); int nBytesRead = 0, nBytesWritten = 0; while (nBytesRead != -1) { nBytesRead = din.read(data, 0, data.length); if (nBytesRead != -1) nBytesWritten = line.write(data, 0, nBytesRead); } // Stop line.drain(); line.stop(); line.close(); din.close(); } }catch(IOException e){ e.printStackTrace(); } } private static SourceDataLine getLine(AudioFormat audioFormat) throws LineUnavailableException{ try{ SourceDataLine res = null; DataLine.Info info = new DataLine.Info(SourceDataLine.class, audioFormat); res = (SourceDataLine) AudioSystem.getLine(info); res.open(audioFormat); return res; }catch(LineUnavailableException e){ e.printStackTrace(); return null; } }
我的这个项目的开始脚本：
java -Dfile.encoding=Cp1252 -classpath bin;lib/libs.jar;lib/graphics.jar;lib/mp3spi/mp3spi.jar;lib/mp3spi/jl.jar;lib/mp3spi/tritonus.jar; Loader
我的Icecast控制面板说它正在流式传输audio/mpeg。通过在任何媒体播放器中打开代码中的URL，我可以很好地访问流。有人可以指出我做错了什么吗？谢谢！
这样的mp3spi库不会将m3u播放列表文件视为受支持的文件。
尝试使用m3u文件中使用的实时流url。即直接将网址指向mp3文件或流。
检查以下功能。mp3spi库直接来自MpegAudioFileReader.java，用于标识使用URL呈现的数据流的格式。它无法识别m3u文件。您可以从http://www.javazoom.net/mp3spi/sources.html检查源。
public AudioFileFormat getAudioFileFormat(InputStream inputStream, long mediaLength) throws UnsupportedAudioFileException, IOException { if (TDebug.TraceAudioFileReader) TDebug.out(">MpegAudioFileReader.getAudioFileFormat(InputStream inputStream, long mediaLength): begin"); HashMap aff_properties = new HashMap(); HashMap af_properties = new HashMap(); int mLength = (int) mediaLength; int size = inputStream.available(); PushbackInputStream pis = new PushbackInputStream(inputStream, MARK_LIMIT); byte head[] = new byte[22]; pis.read(head); if (TDebug.TraceAudioFileReader) { TDebug.out("InputStream : " + inputStream + " =>" + new String(head)); } // Check for WAV, AU, and AIFF, Ogg Vorbis, Flac, MAC file formats. // Next check for Shoutcast (supported) and OGG (unsupported) streams. if ((head[0] == 'R') && (head[1] == 'I') && (head[2] == 'F') && (head[3] == 'F') && (head[8] == 'W') && (head[9] == 'A') && (head[10] == 'V') && (head[11] == 'E')) { if (TDebug.TraceAudioFileReader) TDebug.out("RIFF/WAV stream found"); int isPCM = ((head[21]<<8)&0x0000FF00) | ((head[20])&0x00000FF); if (weak == null) { if (isPCM == 1) throw new UnsupportedAudioFileException("WAV PCM stream found"); } } else if ((head[0] == '.') && (head[1] == 's') && (head[2] == 'n') && (head[3] == 'd')) { if (TDebug.TraceAudioFileReader) TDebug.out("AU stream found"); if (weak == null) throw new UnsupportedAudioFileException("AU stream found"); } else if ((head[0] == 'F') && (head[1] == 'O') && (head[2] == 'R') && (head[3] == 'M') && (head[8] == 'A') && (head[9] == 'I') && (head[10] == 'F') && (head[11] == 'F')) { if (TDebug.TraceAudioFileReader) TDebug.out("AIFF stream found"); if (weak == null) throw new UnsupportedAudioFileException("AIFF stream found"); } else if (((head[0] == 'M') | (head[0] == 'm')) && ((head[1] == 'A') | (head[1] == 'a')) && ((head[2] == 'C') | (head[2] == 'c'))) { if (TDebug.TraceAudioFileReader) TDebug.out("APE stream found"); if (weak == null) throw new UnsupportedAudioFileException("APE stream found"); } else if (((head[0] == 'F') | (head[0] == 'f')) && ((head[1] == 'L') | (head[1] == 'l')) && ((head[2] == 'A') | (head[2] == 'a')) && ((head[3] == 'C') | (head[3] == 'c'))) { if (TDebug.TraceAudioFileReader) TDebug.out("FLAC stream found"); if (weak == null) throw new UnsupportedAudioFileException("FLAC stream found"); } // Shoutcast stream ? else if (((head[0] == 'I') | (head[0] == 'i')) && ((head[1] == 'C') | (head[1] == 'c')) && ((head[2] == 'Y') | (head[2] == 'y'))) { pis.unread(head); // Load shoutcast meta data. loadShoutcastInfo(pis, aff_properties); } // Ogg stream ? else if (((head[0] == 'O') | (head[0] == 'o')) && ((head[1] == 'G') | (head[1] == 'g')) && ((head[2] == 'G') | (head[2] == 'g'))) { if (TDebug.TraceAudioFileReader) TDebug.out("Ogg stream found"); if (weak == null) throw new UnsupportedAudioFileException("Ogg stream found"); } // No, so pushback. else { pis.unread(head); } // MPEG header info. int nVersion = AudioSystem.NOT_SPECIFIED; int nLayer = AudioSystem.NOT_SPECIFIED; int nSFIndex = AudioSystem.NOT_SPECIFIED; int nMode = AudioSystem.NOT_SPECIFIED; int FrameSize = AudioSystem.NOT_SPECIFIED; int nFrameSize = AudioSystem.NOT_SPECIFIED; int nFrequency = AudioSystem.NOT_SPECIFIED; int nTotalFrames = AudioSystem.NOT_SPECIFIED; float FrameRate = AudioSystem.NOT_SPECIFIED; int BitRate = AudioSystem.NOT_SPECIFIED; int nChannels = AudioSystem.NOT_SPECIFIED; int nHeader = AudioSystem.NOT_SPECIFIED; int nTotalMS = AudioSystem.NOT_SPECIFIED; boolean nVBR = false; AudioFormat.Encoding encoding = null; try { Bitstream m_bitstream = new Bitstream(pis); aff_properties.put("mp3.header.pos", new Integer(m_bitstream.header_pos())); Header m_header = m_bitstream.readFrame(); // nVersion = 0 => MPEG2-LSF (Including MPEG2.5), nVersion = 1 => MPEG1 nVersion = m_header.version(); if (nVersion == 2) aff_properties.put("mp3.version.mpeg", Float.toString(2.5f)); else aff_properties.put("mp3.version.mpeg", Integer.toString(2 - nVersion)); // nLayer = 1,2,3 nLayer = m_header.layer(); aff_properties.put("mp3.version.layer", Integer.toString(nLayer)); nSFIndex = m_header.sample_frequency(); nMode = m_header.mode(); aff_properties.put("mp3.mode", new Integer(nMode)); nChannels = nMode == 3 ? 1 : 2; aff_properties.put("mp3.channels", new Integer(nChannels)); nVBR = m_header.vbr(); af_properties.put("vbr", new Boolean(nVBR)); aff_properties.put("mp3.vbr", new Boolean(nVBR)); aff_properties.put("mp3.vbr.scale", new Integer(m_header.vbr_scale())); FrameSize = m_header.calculate_framesize(); aff_properties.put("mp3.framesize.bytes", new Integer(FrameSize)); if (FrameSize < 0) throw new UnsupportedAudioFileException("Invalid FrameSize : " + FrameSize); nFrequency = m_header.frequency(); aff_properties.put("mp3.frequency.hz", new Integer(nFrequency)); FrameRate = (float) ((1.0 / (m_header.ms_per_frame())) * 1000.0); aff_properties.put("mp3.framerate.fps", new Float(FrameRate)); if (FrameRate < 0) throw new UnsupportedAudioFileException("Invalid FrameRate : " + FrameRate); if (mLength != AudioSystem.NOT_SPECIFIED) { aff_properties.put("mp3.length.bytes", new Integer(mLength)); nTotalFrames = m_header.max_number_of_frames(mLength); aff_properties.put("mp3.length.frames", new Integer(nTotalFrames)); } BitRate = m_header.bitrate(); af_properties.put("bitrate", new Integer(BitRate)); aff_properties.put("mp3.bitrate.nominal.bps", new Integer(BitRate)); nHeader = m_header.getSyncHeader(); encoding = sm_aEncodings[nVersion][nLayer - 1]; aff_properties.put("mp3.version.encoding", encoding.toString()); if (mLength != AudioSystem.NOT_SPECIFIED) { nTotalMS = Math.round(m_header.total_ms(mLength)); aff_properties.put("duration", new Long((long) nTotalMS * 1000L)); } aff_properties.put("mp3.copyright", new Boolean(m_header.copyright())); aff_properties.put("mp3.original", new Boolean(m_header.original())); aff_properties.put("mp3.crc", new Boolean(m_header.checksums())); aff_properties.put("mp3.padding", new Boolean(m_header.padding())); InputStream id3v2 = m_bitstream.getRawID3v2(); if (id3v2 != null) { aff_properties.put("mp3.id3tag.v2", id3v2); parseID3v2Frames(id3v2, aff_properties); } if (TDebug.TraceAudioFileReader) TDebug.out(m_header.toString()); } catch (Exception e) { if (TDebug.TraceAudioFileReader) TDebug.out("not a MPEG stream:" + e.getMessage()); throw new UnsupportedAudioFileException("not a MPEG stream:" + e.getMessage()); } // Deeper checks ? int cVersion = (nHeader >> 19) & 0x3; if (cVersion == 1) { if (TDebug.TraceAudioFileReader) TDebug.out("not a MPEG stream: wrong version"); throw new UnsupportedAudioFileException("not a MPEG stream: wrong version"); } int cSFIndex = (nHeader >> 10) & 0x3; if (cSFIndex == 3) { if (TDebug.TraceAudioFileReader) TDebug.out("not a MPEG stream: wrong sampling rate"); throw new UnsupportedAudioFileException("not a MPEG stream: wrong sampling rate"); } // Look up for ID3v1 tag if ((size == mediaLength) && (mediaLength != AudioSystem.NOT_SPECIFIED)) { FileInputStream fis = (FileInputStream) inputStream; byte[] id3v1 = new byte[128]; long bytesSkipped = fis.skip(inputStream.available() - id3v1.length); int read = fis.read(id3v1, 0, id3v1.length); if ((id3v1[0] == 'T') && (id3v1[1] == 'A') && (id3v1[2] == 'G')) { parseID3v1Frames(id3v1, aff_properties); } } AudioFormat format = new MpegAudioFormat(encoding, (float) nFrequency, AudioSystem.NOT_SPECIFIED // SampleSizeInBits - The size of a sample , nChannels // Channels - The number of channels , -1 // The number of bytes in each frame , FrameRate // FrameRate - The number of frames played or recorded per second , true, af_properties); return new MpegAudioFileFormat(MpegFileFormatType.MP3, format, nTotalFrames, mLength, aff_properties); }
