?? dcodcbg.c
字號:
/**************************************************************************
*
* ROUTINE
* dcodcbg.c
*
* FUNCTION
* Decodes all code book gains for a frame
*
*
* SYNOPSIS
* subroutine dcodcbg(cbgbits,bitsum1,bitsum2,bitpointer,
* nn,stream,cbg)
*
* formal
*
* data I/O
* name type type function
* -------------------------------------------------------------------
* cbgbits int i number of bits for quantization
* bitsum1 int i number of bits for odd subframes
* bitsum2 int i number of bits for even subframes
* bitpointer int i/o number of bits used
* nn int i number of subframes/frame
* stream short i bit stream
* cbg float o vector of code book indicies
*
***************************************************************************
*
* DESCRIPTION
*
*
***************************************************************************
*
* CALLED BY
*
* celp
*
* CALLS
*
* gaindecode unpack
*
***************************************************************************
*
* REFERENCES
*
*
**************************************************************************/
dcodcbg(cbgbits, bitsum1, bitsum2, bitpointer, nn, stream, cbg)
int cbgbits, bitsum1, bitsum2, *bitpointer, nn;
short stream[];
float cbg[];
{
int i, pointer, index;
pointer = *bitpointer;
for (i = 0; i < nn; i++)
{
unpack(stream, cbgbits, &index, &pointer);
gaindecode(index, cbgbits, &cbg[i]);
if (i == 0 || i == 2 || i == 4)
pointer += bitsum2 - cbgbits;
else if (i == 1 || i == 3 || i == 5)
pointer += bitsum1 - cbgbits;
else
printf("dcodcbg: ***Error in decoding cbgain\n");
}
*bitpointer += cbgbits;
}
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