This post originated from an RSS feed registered with Java Buzz by Wilfred Springer. Original Post: Bit Syntax for Java (I) Feed Title: Distributed Reflections of the Third Kind Feed URL: http://blog.flotsam.nl/feeds/posts/default/-/Java Feed Description: Anything coming to my mind having to do with Java Latest Java Buzz Posts Latest Java Buzz Posts by Wilfred Springer Latest Posts From Distributed Reflections of the Third Kind

decode_header(<<2#11111111111:11,B:2,C:2,_D:1,E:4,F:2,G:1,Bits:9>>) ->
 Vsn = case B of
      0 -> {2,5};
      1 -> exit(badVsn);
      2 -> 2;
      3 -> 1
  end,
 Layer = case C of
 0 -> exit(badLayer);
 1 -> 3;
 2 -> 2;
 3 -> 1
    end,
 %% Protection = D,
 BitRate = bitrate(Vsn, Layer, E) * 1000,
 SampleRate = samplerate(Vsn, F),
 Padding = G,
 FrameLength = framelength(Layer, BitRate, SampleRate, Padding),
 if
FrameLength < 21 ->
    exit(frameSize);
true ->
    {ok, FrameLength, {Layer,BitRate,SampleRate,Vsn,Bits}}
 end;
decode_header(_) ->
 exit(badHeader).

public class MpegHeader {

  @BoundNumber(size="11", match="0b11111111111")
  private int frameSync;

  @BoundNumber(size="2")
  private int mpegAudioVersionId;

  @BoundNumber(size="2")
  private int layerDescription;

  @Bound
  private boolean crcProtected;

  @BoundNumber(size="4")
  private int bitRateIndex;

  @BoundNumber(size="2")
  private int sampleRateFrequencyIndex;

  @Bound
  private boolean padded;

  @Bound
  private boolean privateBit;

  @BoundNumber(size="2")
  private int channelMode;

  @BoundNumber(size="2")
  private int modeExtension;

  @Bound
  private boolean copyright;

  @Bound
  private boolean original;

  @BoundNumber(size="2")
  private int emphasis;

}

Codec codec = new Codecs.create(MpegHeader.class);
Codecs.decode(codec, buffer);