本文介绍了Java的音频流（mp3spi LIB），UnsupportedAudioFileException的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我已经看到关于流媒体MP3流（如的Icecast）多堆栈溢出的问题。他们都说用MP3SPI库，对此我。 MP3SPI是允许音频/ MPEG MIME类型的支持。这是我的Icecast流是什么。我没有在我的类路径中的所有三个jar文件，但是在使用相同code他们一个例子提供，我仍然得到 UnsupportedAudioFileException ：
I have seen multiple Stack Overflow questions regarding streaming MP3 streams (like Icecast). They all say to use the MP3SPI libraries, which I am. MP3SPI is for allowing support to audio/mpeg mime types. That's what my Icecast stream is. I have all three jar files in my classpath correctly, but while using the same code they provide in an example, I still get 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)
下面是我的code：
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;
}
}
我对这个项目的启动脚本：
My start script for this project:
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
和我的Icecast的控制面板说，它目前的流音频/ MPEG 。我可以在任何媒体播放器我的code起来打开该网址访问我流精。有人能指出我在做什么错？谢谢！
And my Icecast control panel says it's currently streaming audio/mpeg. I can access my stream fine by opening that URL in my code up in any media player. Can someone point out what I'm doing wrong? Thanks!
推荐答案
mp3spi库因此不会考虑m3u播放文件作为支持的文件。
mp3spi library as such does not consider m3u playlist file as a supported file.
尝试使用m3u文件内使用真正的流网址。即直接链接到MP3文件或流。
Try using the real stream url used inside the m3u file. ie the url directly to the mp3 file or stream.
检查下面的功能。其直出MpegAudioFileReader.java的，mp3spi库使用的数据流，你使用URL presented识别的格式。它不识别的m3u文件。如果从。
Check the function below. Its straight out of MpegAudioFileReader.java, mp3spi library uses to identify the format of the data stream you presented using URL. It doesn't recognize an m3u file. You can check the source if you want from http://www.javazoom.net/mp3spi/sources.html.
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);
}
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