org.xiph.speex
Class SpeexEncoder
java.lang.Object
org.xiph.speex.SpeexEncoder
public class SpeexEncoder
extends java.lang.Object
Main Speex Encoder class.
This class encodes the given PCM 16bit samples into Speex packets.
- Marc Gimpel, Wimba S.A. (mgimpel@horizonwimba.com)
int | getChannels() - Returns the number of channels.
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Encoder | getEncoder() - Returns the Encoder being used (Narrowband, Wideband or Ultrawideband).
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int | getFrameSize() - Returns the size of a frame.
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int | getProcessedData(byte[] data, int offset) - Pull the decoded data out into a byte array at the given offset
and returns the number of bytes of encoded data just read.
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int | getProcessedDataByteSize() - Returns the number of bytes of encoded data ready to be read.
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int | getSampleRate() - Returns the sample rate.
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boolean | init(int mode, int quality, int sampleRate, int channels) - Initialisation
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static void | mapPcm16bitLittleEndian2Float(byte[] pcm16bitBytes, int offsetInput, float[] samples, int offsetOutput, int length) - Converts a 16 bit linear PCM stream (in the form of a byte array)
into a floating point PCM stream (in the form of an float array).
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boolean | processData(byte[] data, int offset, int len) - This is where the actual encoding takes place
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boolean | processData(float[] data, int numSamples) - Encode an array of floats.
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boolean | processData(short[] data, int offset, int numShorts) - Encode an array of shorts.
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VERSION
public static final String VERSION
Version of the Speex Encoder
channels
private int channels
frameSize
private int frameSize
rawData
private float[] rawData
sampleRate
private int sampleRate
SpeexEncoder
public SpeexEncoder()
Constructor
getChannels
public int getChannels()
Returns the number of channels.
getEncoder
public Encoder getEncoder()
Returns the Encoder being used (Narrowband, Wideband or Ultrawideband).
- the Encoder being used (Narrowband, Wideband or Ultrawideband).
getFrameSize
public int getFrameSize()
Returns the size of a frame.
getProcessedData
public int getProcessedData(byte[] data,
int offset)
Pull the decoded data out into a byte array at the given offset
and returns the number of bytes of encoded data just read.
- the number of bytes of encoded data just read.
getProcessedDataByteSize
public int getProcessedDataByteSize()
Returns the number of bytes of encoded data ready to be read.
- the number of bytes of encoded data ready to be read.
getSampleRate
public int getSampleRate()
Returns the sample rate.
init
public boolean init(int mode,
int quality,
int sampleRate,
int channels)
Initialisation
mode
- the mode of the encoder (0=NB, 1=WB, 2=UWB).quality
- the quality setting of the encoder (between 0 and 10).sampleRate
- the number of samples per second.channels
- the number of audio channels (1=mono, 2=stereo, ...).
- true if initialisation successful.
mapPcm16bitLittleEndian2Float
public static void mapPcm16bitLittleEndian2Float(byte[] pcm16bitBytes,
int offsetInput,
float[] samples,
int offsetOutput,
int length)
Converts a 16 bit linear PCM stream (in the form of a byte array)
into a floating point PCM stream (in the form of an float array).
Here are some important details about the encoding:
- Java uses big endian for shorts and ints, and Windows uses little Endian.
Therefore, shorts and ints must be read as sequences of bytes and
combined with shifting operations.
pcm16bitBytes
- - byte array of linear 16-bit PCM formated audio.offsetInput
- samples
- - float array to receive the 16-bit linear audio samples.offsetOutput
- length
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processData
public boolean processData(byte[] data,
int offset,
int len)
This is where the actual encoding takes place
processData
public boolean processData(float[] data,
int numSamples)
Encode an array of floats.
processData
public boolean processData(short[] data,
int offset,
int numShorts)
Encode an array of shorts.
data
- offset
- numShorts
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