net.java.sip.communicator.impl.neomedia.codec.audio.g729
Class Bits

java.lang.Object
  net.java.sip.communicator.impl.neomedia.codec.audio.g729.Bits

 class Bits
extends Object

Bit stream manipulation routines.

prm2bits_ld8k -converts encoder parameter vector into vector of serial bits

bits2prm_ld8k - converts serial received bits to encoder parameter vector

 The transmitted parameters for 8000 bits/sec are:

     LPC:     1st codebook           7+1 bit
              2nd codebook           5+5 bit

     1st subframe:
          pitch period                 8 bit
          parity check on 1st period   1 bit
          codebook index1 (positions) 13 bit
          codebook index2 (signs)      4 bit
          pitch and codebook gains   4+3 bit

     2nd subframe:
          pitch period (relative)      5 bit
          codebook index1 (positions) 13 bit
          codebook index2 (signs)      4 bit
          pitch and codebook gains   4+3 bit
 

Author:

Lubomir Marinov (translation of ITU-T C source code to Java)

Constructor Summary

Bits()

Method Summary

(package private) static void	bits2prm_ld8k(short[] bits, int[] prm) Converts serial received bits to encoder parameter vector.
(package private) static void	bits2prm_ld8k(short[] bits, int bits_offset, int[] prm, int prm_offset) Converts serial received bits to encoder parameter vector.
(package private) static void	prm2bits_ld8k(int[] prm, short[] bits) Converts encoder parameter vector into vector of serial bits.

Methods inherited from class java.lang.Object

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

Constructor Detail

Bits

Bits()

Method Detail

prm2bits_ld8k

static void prm2bits_ld8k(int[] prm,
                          short[] bits)

Converts encoder parameter vector into vector of serial bits.

Parameters:

prm - input : encoded parameters

bits - output: serial bits

bits2prm_ld8k

static void bits2prm_ld8k(short[] bits,
                          int[] prm)

Converts serial received bits to encoder parameter vector.

Parameters:

bits - input : serial bits

prm - output: decoded parameters

bits2prm_ld8k

static void bits2prm_ld8k(short[] bits,
                          int bits_offset,
                          int[] prm,
                          int prm_offset)

Converts serial received bits to encoder parameter vector.

Parameters:

bits - input : serial bits

bits_offset - input : serial bits offset

prm - output: decoded parameters

prm_offset - input: decoded parameters offset