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