org.xiph.speex
Class PcmWaveWriter

java.lang.Object
  org.xiph.speex.AudioFileWriter
      org.xiph.speex.PcmWaveWriter

public class PcmWaveWriter

extends AudioFileWriter

Writes basic PCM wave files from binary audio data.

Here's an example that writes 2 seconds of silence

 PcmWaveWriter s_wsw = new PcmWaveWriter();
 byte[] silence = new byte[16*2*44100];
 wsw.SetFormat(2, 44100);
 wsw.Open("C:\\out.wav");
 wsw.WriteHeader(); 
 wsw.WriteData(silence, 0, silence.length);
 wsw.WriteData(silence, 0, silence.length);
 wsw.Close(); 
 

Version:

$Revision: 1.7 $

Author:

Jim Lawrence, helloNetwork.com, Marc Gimpel, Wimba S.A. (marc@wimba.com)

Field Summary

private int	channels
private java.io.RandomAccessFile	raf
private int	sampleRate
private int	size

Constructor Summary

PcmWaveWriter()
Constructor.

PcmWaveWriter(int channels, int sampleRate)
Constructor.

Method Summary

void	close() Closes the output file.
void	open(java.lang.String filename) Open the output file.
private void	setFormat(int channels, int sampleRate) Sets the output format.
void	writeHeader(java.lang.String comment) Writes the initial data chunks that start the wave file.
void	writePacket(byte[] data, int offset, int len) Writes a packet of audio.

Methods inherited from class org.xiph.speex.AudioFileWriter

writeInt, writeInt, writeLong, writeShort, writeShort

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

raf

private java.io.RandomAccessFile raf

channels

private int channels

sampleRate

private int sampleRate

size

private int size

Constructor Detail

PcmWaveWriter

public PcmWaveWriter()

Constructor.

PcmWaveWriter

public PcmWaveWriter(int channels,
                     int sampleRate)

Constructor.

Parameters:

channels -

sampleRate -

Method Detail

setFormat

private void setFormat(int channels,
                       int sampleRate)

Sets the output format. Must be called before WriteHeader().

Parameters:

channels -

sampleRate -

close

public void close()
           throws java.io.IOException

Closes the output file. MUST be called to have a correct stream.

Specified by:

close in class AudioFileWriter

Throws:

java.io.IOException

open

public void open(java.lang.String filename)
          throws java.io.IOException

Open the output file.

Specified by:

open in class AudioFileWriter

Parameters:

filename - filename to open.

Throws:

java.io.IOException

writeHeader

public void writeHeader(java.lang.String comment)
                 throws java.io.IOException

Writes the initial data chunks that start the wave file. Prepares file for data samples to written.

Specified by:

writeHeader in class AudioFileWriter

Parameters:

comment - ignored by the WAV header.

Throws:

java.io.IOException

writePacket

public void writePacket(byte[] data,
                        int offset,
                        int len)
                 throws java.io.IOException

Writes a packet of audio.

Specified by:

writePacket in class AudioFileWriter

Parameters:

data - audio data

offset - the offset from which to start reading the data.

len - the length of data to read.

Throws:

java.io.IOException