Package org.xiph.speex
Class SpeexEncoder
java.lang.Object
org.xiph.speex.SpeexEncoder
Main Speex Encoder class.
This class encodes the given PCM 16bit samples into Speex packets.
- Version:
- $Revision: 1.6 $
- Author:
- Marc Gimpel, Wimba S.A. (mgimpel@horizonwimba.com)
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Field Summary
Fields -
Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionint
Returns the number of channels.Returns the Encoder being used (Narrowband, Wideband or Ultrawideband).int
Returns the size of a frame.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.int
Returns the number of bytes of encoded data ready to be read.int
Returns the sample rate.boolean
init
(int mode, int quality, int sampleRate, int channels) Initialisationstatic 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).boolean
processData
(byte[] data, int offset, int len) This is where the actual encoding takes placeboolean
processData
(float[] data, int numSamples) Encode an array of floats.boolean
processData
(short[] data, int offset, int numShorts) Encode an array of shorts.
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Field Details
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VERSION
Version of the Speex Encoder- See Also:
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encoder
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bits
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rawData
private float[] rawData -
sampleRate
private int sampleRate -
channels
private int channels -
frameSize
private int frameSize
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Constructor Details
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SpeexEncoder
public SpeexEncoder()Constructor
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Method Details
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init
public boolean init(int mode, int quality, int sampleRate, int channels) Initialisation- Parameters:
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, ...).- Returns:
- true if initialisation successful.
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getEncoder
Returns the Encoder being used (Narrowband, Wideband or Ultrawideband).- Returns:
- the Encoder being used (Narrowband, Wideband or Ultrawideband).
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getSampleRate
public int getSampleRate()Returns the sample rate.- Returns:
- the sample rate.
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getChannels
public int getChannels()Returns the number of channels.- Returns:
- the number of channels.
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getFrameSize
public int getFrameSize()Returns the size of a frame.- Returns:
- the size of a frame.
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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.- Parameters:
data
-offset
-- Returns:
- the number of bytes of encoded data just read.
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getProcessedDataByteSize
public int getProcessedDataByteSize()Returns the number of bytes of encoded data ready to be read.- Returns:
- the number of bytes of encoded data ready to be read.
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processData
public boolean processData(byte[] data, int offset, int len) This is where the actual encoding takes place- Parameters:
data
-offset
-len
-- Returns:
- true if successful.
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processData
public boolean processData(short[] data, int offset, int numShorts) Encode an array of shorts.- Parameters:
data
-offset
-numShorts
-- Returns:
- true if successful.
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processData
public boolean processData(float[] data, int numSamples) Encode an array of floats.- Parameters:
data
-numSamples
-- Returns:
- true if successful.
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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.
- Parameters:
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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