org.zoolu.sound.codec

Class AMR

java.lang.Object

org.zoolu.sound.codec.AMR

public class AMR
extends java.lang.Object

Adaptive Multi-Rate (AMR-NB) CODEC.

Field Summary

Fields

Modifier and Type	Field and Description
static byte[]	AMR_HEADER AMR file header
static int	M0_0475
static int	M1_0515
static int	M15_NO_DATA
static int	M2_0590
static int	M3_0670
static int	M4_0740
static int	M5_0795
static int	M6_1020
static int	M7_1220
static int	M8_SID

Constructor Summary

Constructors

Constructor and Description
AMR() Creates a new AMR.

Method Summary

Modifier and Type	Method and Description
void	decode(byte[] inbuf, short[] frame) Decodes an AMR frame (160 audio samples).
int	encode(int mode, short[] frame, byte[] outbuf) Encodes an AMR frame (160 audio samples) using the given AMR mode.
static int	framePayloadBitSize(int mode) Gets frame payload size, in bits, for a given AMR mode, without considering any AMR header.
static int	frameSize(int mode) Gets frame size (in bytes) for a given AMR mode including one byte of AMR header (i.e.

Methods inherited from class java.lang.Object

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

Field Detail

M0_0475

public static final int M0_0475

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Constant Field Values

M1_0515

public static final int M1_0515

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Constant Field Values

M2_0590

public static final int M2_0590

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Constant Field Values

M3_0670

public static final int M3_0670

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Constant Field Values

M4_0740

public static final int M4_0740

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Constant Field Values

M5_0795

public static final int M5_0795

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Constant Field Values

M6_1020

public static final int M6_1020

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Constant Field Values

M7_1220

public static final int M7_1220

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Constant Field Values

M8_SID

public static final int M8_SID

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Constant Field Values

M15_NO_DATA

public static final int M15_NO_DATA

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Constant Field Values

AMR_HEADER

public static final byte[] AMR_HEADER

AMR file header

Constructor Detail

AMR

public AMR()

Creates a new AMR.

Method Detail

frameSize

public static int frameSize(int mode)

Gets frame size (in bytes) for a given AMR mode including one byte of AMR header (i.e. ToC entry, specifing the frame mode).

Parameters:

mode - the AMR mode

Returns:

the frame size (in bytes) including Table of Contents (ToC) entry (1 byte)

framePayloadBitSize

public static int framePayloadBitSize(int mode)

Gets frame payload size, in bits, for a given AMR mode, without considering any AMR header.

Parameters:

mode - the AMR mode

Returns:

the size in bits of the frame payload (without AMR header) for a given AMR mode

encode

public int encode(int mode,
                  short[] frame,
                  byte[] outbuf)

Encodes an AMR frame (160 audio samples) using the given AMR mode.

Parameters:

mode - AMR mode

frame - input PCM frame

outbuf - output buffer for the AMR frame

Returns:

the length of the the encoded AMR frame

decode

public void decode(byte[] inbuf,
                   short[] frame)

Decodes an AMR frame (160 audio samples).

Parameters:

inbuf - input AMR frame

frame - output buffer for the PCM frame