public class Speex2PcmAudioInputStream extends FilteredAudioInputStream
Modifier and Type | Field and Description |
---|---|
private Bits |
bits
Speex bit packing and unpacking class.
|
private int |
channelCount
The number of audio channels (1=mono, 2=stereo).
|
private float[] |
decodedData
Array containing the decoded audio samples.
|
private Decoder |
decoder
Speex Decoder.
|
private int |
frameSize
The frame size, in samples.
|
private int |
framesPerPacket
The number of Speex frames that will be put in each Ogg packet.
|
private boolean |
initialised
Flag to indicate if this Stream has been initialised.
|
private byte[] |
outputData
Array containing the decoded audio samples converted into bytes.
|
private int |
packetCount
The number of Ogg packets that have been decoded in the current page.
|
private byte[] |
packetSizes
Array containing the sizes of Ogg packets in the current page.
|
private int |
packetsPerOggPage
The number of Ogg packets that are in each Ogg page.
|
private int |
sampleRate
The sample rate of the audio, in samples per seconds (Hz).
|
private int |
streamSerialNumber
A unique serial number that identifies the Ogg stream.
|
Constructor and Description |
---|
Speex2PcmAudioInputStream(java.io.InputStream in,
javax.sound.sampled.AudioFormat format,
long length)
Constructor
|
Speex2PcmAudioInputStream(java.io.InputStream in,
javax.sound.sampled.AudioFormat format,
long length,
int size)
Constructor
|
Modifier and Type | Method and Description |
---|---|
int |
available()
Returns the number of bytes that can be read from this inputstream without
blocking.
|
protected void |
decode(byte[] data,
int offset,
int len)
This is where the actual decoding takes place.
|
protected void |
fill()
Fills the buffer with more data, taking into account shuffling and other
tricks for dealing with marks.
|
protected void |
initialise(boolean blocking)
Initialises the Ogg Speex to PCM InputStream.
|
private static int |
readInt(byte[] data,
int offset)
Converts Little Endian (Windows) bytes to an int (Java uses Big Endian).
|
private void |
readOggPageHeader()
Read the Ogg Page header and extract the speex packet sizes.
|
long |
skip(long n)
See the general contract of the
skip method of
InputStream . |
checkIfStillOpen, close, makeSpace, mark, markSupported, read, read, reset
private boolean initialised
private int sampleRate
private int channelCount
private float[] decodedData
private byte[] outputData
private Bits bits
private Decoder decoder
private int frameSize
private int framesPerPacket
private int streamSerialNumber
private int packetsPerOggPage
private int packetCount
private byte[] packetSizes
public Speex2PcmAudioInputStream(java.io.InputStream in, javax.sound.sampled.AudioFormat format, long length)
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.public Speex2PcmAudioInputStream(java.io.InputStream in, javax.sound.sampled.AudioFormat format, long length, int size)
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.java.lang.IllegalArgumentException
- if size <= 0.protected void initialise(boolean blocking) throws java.io.IOException
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_tableSpeex 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
blocking
- whether the method should block until initialisation is
successfully completed or not.java.io.IOException
protected void fill() throws java.io.IOException
fill
in class FilteredAudioInputStream
java.io.IOException
protected void decode(byte[] data, int offset, int len) throws java.io.StreamCorruptedException
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.java.io.StreamCorruptedException
- If the input stream not valid Ogg Speex
data.public long skip(long n) throws java.io.IOException
skip
method of
InputStream
.skip
in class FilteredAudioInputStream
n
- the number of bytes to be skipped.java.io.IOException
- if an I/O error occurs.public int available() throws java.io.IOException
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).
available
in class FilteredAudioInputStream
java.io.IOException
- if an I/O error occurs.FilteredAudioInputStream.in
private void readOggPageHeader() throws java.io.IOException
java.io.IOException
private static int readInt(byte[] data, int offset)
data
- the data to read.offset
- the offset from which to start reading.Copyright © 1999-2004 Wimba S.A. All Rights Reserved.