Module org.monte.media
Package org.monte.media.mp3

Class MP3ElementaryInputStream.Frame

java.lang.Object
org.monte.media.mp3.MP3ElementaryInputStream.Frame
Enclosing class:
MP3ElementaryInputStream
public static class MP3ElementaryInputStream.Frame extends Object
An elementary frame.

  • Constructor Details

    • Frame

      public Frame(int header)
      Creates a new frame.
      Parameters:
      header - The 32-bit Frame header

  • Method Details

    • getHeaderCode

      public int getHeaderCode()
      Returns the raw 32-bit header code as it is stored in the file.

    • getVersion

      public int getVersion()
      Returns the version number: 1=MPEG 1, 2=MPEG 2, 25=MPEG 2.5; -1=unknown.

    • getVersionCode

      public int getVersionCode()
      Returns the version code as it is stored in the header. 3=MPEG 1, 2=MPEG 2, 1=reserved, 0=MPEG 2.5.

    • getLayer

      public int getLayer()
      Returns the layer number. 1=Layer I, 2=Layer II, 3=Layer III, -1=unknown.

    • getLayerCode

      public int getLayerCode()
      Returns the raw layer code as it is stored in the header. 3=Layer I, 2=Layer II, 1=Layer III, 0=reserved.

    • getBitRate

      public int getBitRate()
      Returns the bitrate of the frame. Returns -1 if unknown.

    • getBitRateCode

      public int getBitRateCode()
      Returns the raw bitrate code as it is stored in the header.

    • hasCRC

      public boolean hasCRC()
      Returns true if this frame has a CRC.

    • getCRC

      public int getCRC()
      Returns the CRC of this frame. The value is only valid if hasCRC() returns true.

    • hasPadding

      public boolean hasPadding()

    • getSampleRate

      public int getSampleRate()
      Returns the sample rate in Hz. Returns -1 if unknown.

    • getSampleRateCode

      public int getSampleRateCode()
      Returns the raw sample rate code as it is stored in the header.

    • getSampleCount

      public int getSampleCount()
      Returns the number of samples in the frame. It is constant and always 384 samples for Layer I and 1152 samples for Layer II and Layer III. Returns -1 if unknown.

    • getChannelCount

      public int getChannelCount()
      Returns the number of channels.
      Returns:
      1=mono, 2=stereo, joint stereo or dual channel.

    • getSampleSize

      public int getSampleSize()
      Returns the sample size in bits. Always 16 bit per sample.

    • getChannelModeCode

      public int getChannelModeCode()
      Returns the raw channel mode code as stored in the header.
      Returns:
      0=stereo, 1=joint stereo, 2=dual channel, 3=single channel (mono).

    • headerToByteArray

      public byte[] headerToByteArray()
      Returns the frame header as a byte array.

    • headerToByteArray

      public int headerToByteArray(byte[] data, int offset)
      Writes the frame header into the specified byte array. Returns the number of bytes written.

    • writeHeader

      public void writeHeader(OutputStream out) throws IOException
      Writes the frame header into the specified output stream.
      Throws:
      IOException

    • getFrameOffset

      public long getFrameOffset()
      Returns the offset of the frame in the input stream.

    • getFrameSize

      public int getFrameSize()
      Returns the size of the frame in bytes. This size includes the header, the data and the padding.

    • getHeaderOffset

      public long getHeaderOffset()
      Returns the offset of the header in the input stream.

    • getHeaderSize

      public int getHeaderSize()
      Returns the size of the header in bytes.

    • getSideInfoOffset

      public long getSideInfoOffset()
      Returns the offset of the side info in the input stream.

    • getSideInfoSize

      public int getSideInfoSize()
      Returns the size of the side info in bytes. It is 17 bytes long in a single channel frame and 32 bytes in dual channel or stereo channel.

    • getBodyOffset

      public long getBodyOffset()
      Returns the offset of the frame body in the input stream.

    • getBodySize

      public int getBodySize()
      Returns the size of the frame body in bytes. The body includes the side info, the audio data, and the padding.

    • getPaddingSize

      public int getPaddingSize()
      Padding is used to fit the bit rates exactly. For an example: 128k 44.1kHz layer II uses a lot of 418 bytes and some of 417 bytes long frames to get the exact 128k bitrate. For Layer I slot is 32 bits long, for Layer II and Layer III slot is 8 bits long.