Package javaforce.codec.speex.spi

Class Speex2PcmAudioInputStream

java.lang.Object
java.io.InputStream
javax.sound.sampled.AudioInputStream
javaforce.codec.speex.spi.FilteredAudioInputStream
javaforce.codec.speex.spi.Speex2PcmAudioInputStream
All Implemented Interfaces:
Closeable, AutoCloseable
public class Speex2PcmAudioInputStream extends FilteredAudioInputStream
Converts an Ogg Speex bitstream into a PCM 16bits/sample audio stream.
Version:
$Revision$
Author:
Marc Gimpel, Wimba S.A. (mgimpel@horizonwimba.com)

  • Constructor Details

    • Speex2PcmAudioInputStream

      public Speex2PcmAudioInputStream(InputStream in, AudioFormat format, long length)
      Constructor
      Parameters:
      in - the underlying input stream.
      format - the target format of this stream's audio data.
      length - the length in sample frames of the data in this stream.

    • Speex2PcmAudioInputStream

      public Speex2PcmAudioInputStream(InputStream in, AudioFormat format, long length, int size)
      Constructor
      Parameters:
      in - the underlying input stream.
      format - the target format of this stream's audio data.
      length - the length in sample frames of the data in this stream.
      size - the buffer size.
      Throws:
      IllegalArgumentException - if size <= 0.

  • Method Details

    • initialise

      protected void initialise(boolean blocking) throws IOException
      Initialises the Ogg Speex to PCM InputStream. Read the Ogg Speex header and extract the speex decoder parameters to initialise the decoder. Then read the Comment header. Ogg Header description: 
        0 -  3: capture_pattern
       4: stream_structure_version
       5: header_type_flag (2=bos: beginning of sream)
  6 - 13: absolute granule position
 14 - 17: stream serial number
 18 - 21: page sequence no
 22 - 25: page checksum
      26: page_segments
 27 -...: segment_table
      Speex Header description 
        0 -  7: speex_string
  8 - 27: speex_version
 28 - 31: speex_version_id
 32 - 35: header_size
 36 - 39: rate
 40 - 43: mode (0=narrowband, 1=wb, 2=uwb)
 44 - 47: mode_bitstream_version
 48 - 51: nb_channels
 52 - 55: bitrate
 56 - 59: frame_size
 60 - 63: vbr
 64 - 67: frames_per_packet
 68 - 71: extra_headers
 72 - 75: reserved1
 76 - 79: reserved2
      Parameters:
      blocking - whether the method should block until initialisation is successfully completed or not.
      Throws:
      IOException

    • fill

      protected void fill() throws IOException
      Fills the buffer with more data, taking into account shuffling and other tricks for dealing with marks. Assumes that it is being called by a synchronized method. This method also assumes that all data has already been read in, hence pos > count.
      Overrides:
      fill in class FilteredAudioInputStream
      Throws:
      IOException

    • decode

      protected void decode(byte[] data, int offset, int len) throws StreamCorruptedException
      This is where the actual decoding takes place.
      Parameters:
      data - the array of data to decode.
      offset - the offset from which to start reading the data.
      len - the length of data to read from the array.
      Throws:
      StreamCorruptedException - If the input stream not valid Ogg Speex data.

    • skip

      public long skip(long n) throws IOException
      See the general contract of the skip method of InputStream.
      Overrides:
      skip in class FilteredAudioInputStream
      Parameters:
      n - the number of bytes to be skipped.
      Returns:
      the actual number of bytes skipped.
      Throws:
      IOException - if an I/O error occurs.

    • available

      public int available() throws IOException
      Returns the number of bytes that can be read from this inputstream without blocking.

      The available method of FilteredAudioInputStream returns the sum of the the number of bytes remaining to be read in the buffer (count - pos). The result of calling the available method of the underlying inputstream is not used, as this data will have to be filtered, and thus may not be the same size after processing (although subclasses that do the filtering should override this method and use the amount of data available in the underlying inputstream).

      Overrides:
      available in class FilteredAudioInputStream
      Returns:
      the number of bytes that can be read from this inputstream without blocking.
      Throws:
      IOException - if an I/O error occurs.
      See Also: