Java播放AAC编码的音频（JAAD解码器）
我一直在努力用Java播放aac编码的音频文件。
我们在第一学期末有一个小组项目，希望有一个背景音乐，并且那里几乎没有音效。最后，我们使用了WAV文件，因为我们无法播放AAC。
回答：
这个周末，我再次尝试了一次，然后再次搜索，并且从不同的站点一起搜索了一个工作代码，但是没有一个完整的工作解决方案。
为了在以后的项目中更舒适地使用，我为我准备了一个小库，用于AAC播放。
由于很难找到可行的解决方案，因此我想与您分享，希望以后遇到同样问题的人可以更轻松一些。
以下代码是我编写的lib的代码段。您可以在AACPlayer的
GitHub上查看整个库 。
该库/解决方案使用aac解码器JAAD。
public static void play(File[] files){
// local vars
byte[] b; // array for the actual audio Data during the playback
AudioTrack track; // track we are playing atm
AudioFormat af; // the track's format
SourceDataLine line; // the line we'll use the get our audio to the speaker's
Decoder dec; // decoder to get the audio bytes
Frame frame; //
SampleBuffer buf; //
int currentTrack; // index of current track from playlist
MP4Container cont; // container to open the current track with
Movie movie; // and get the content from the container
try
{
// for-next loop to play each titel from the playlist once
for (currentTrack = 0; currentTrack < files.length; currentTrack++)
{
cont = new MP4Container(new RandomAccessFile(files[currentTrack], "r")); // open titel with random access
movie = cont.getMovie(); // get content from container,
List<Track> content = movie.getTracks();
if (content.isEmpty()) // check if container HAS content
throw new Exception ("insert error message here"); // if so,
track = (AudioTrack) movie.getTracks().get(0); // grab first track and set the audioformat
af = new AudioFormat(track.getSampleRate(), track.getSampleSize(), track.getChannelCount(), true, true);
line = AudioSystem.getSourceDataLine(af); // get a DataLine from the AudioSystem
line.open(); // open and
line.start(); // start it
dec = new Decoder(track.getDecoderSpecificInfo());
buf = new SampleBuffer();
while(track.hasMoreFrames()) // while we have frames left
{
frame = track.readNextFrame(); // read next frame,
dec.decodeFrame(frame.getData(), buf); // decode it and put into the buffer
b = buf.getData(); // write the frame data from the buffer to our byte-array
line.write(b, 0, b.length); // and from there write the byte array into our open AudioSystem DataLine
while (paused) // check if we should pause
{
Thread.sleep(500); // if yes, stay half a second
if (Thread.interrupted()) // check if we should stop possibly
{
line.close(); // if yes, close line and
return; // exit thread
}
}
if (Thread.interrupted()) // if not in pause, still check on each frame if we should
{ // stop. If so
line.close(); // close line and
return; // exit thread
}
}
line.close(); // after titel is over, close line
if (loop) // if we should loop current titel, set currentTrack -1,
currentTrack--; // as on bottom of for-next it get's +1 and so the same titel get's played again
else if (repeat && (currentTrack == files.length -1)) // else check if we are at the end of the playlist
currentTrack = -1; // and should repeat the whole list. If so, set currentTrack -1, so it get's 0 on for-next bottom
}
}
catch (LineUnavailableException | IOException | InterruptedException e)
{
e.printStackTrace();
}
}
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