bitpack.c

完整的EVRC压缩解压缩算法源码,通过C-C++编译后可以运行!

/**********************************************************************
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even though this Publication may contain the Contribution or a derivative 
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the Source's rights to license as herein provided.

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formulating groups of 3GPP2 or any of its Organizational Partners, it 
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specifically reserve(s) the right to amend or modify the material 
contained in the Contribution. Nothing contained in the Contribution 
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*******************************************************************/
 
/*======================================================================*/
/*     Enhanced Variable Rate Codec - Bit-Exact C Specification         */
/*     Copyright (C) 1997-1998 Telecommunications Industry Association. */
/*     All rights reserved.                                             */
/*----------------------------------------------------------------------*/
/* Note:  Reproduction and use of this software for the design and      */
/*     development of North American Wideband CDMA Digital              */
/*     Cellular Telephony Standards is authorized by the TIA.           */
/*     The TIA does not authorize the use of this software for any      */
/*     other purpose.                                                   */
/*                                                                      */
/*     The availability of this software does not provide any license   */
/*     by implication, estoppel, or otherwise under any patent rights   */
/*     of TIA member companies or others covering any use of the        */
/*     contents herein.                                                 */
/*                                                                      */
/*     Any copies of this software or derivative works must include     */
/*     this and all other proprietary notices.                          */
/*======================================================================*/
/*  Module:     Bitpack                                                 */
/*----------------------------------------------------------------------*/
/*  Memory Usage:                                                       */
/*      ROM:                0                                           */
/*      Static/Global RAM:  0                                           */
/*      Stack/Local RAM:    0                                           */
/*----------------------------------------------------------------------*/

/************************************************
* Routine name: Bitpack                         *
* Function: pack input data into bitstream.     *
* Inputs:                                       *
*    in - input data.                           *
*    TrWords - pointer to transmit words memory.*
*    NoOfBits - number of bits in input data.   *
*    ptr - bit and word pointers.               *
*                                               *
************************************************/

/*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 * **Bit-Exact Comparison of "bitpack_fixed.out" & "bitpack_float.out"**
 * Number of Difference: 0 of 57552
 * Mininum Difference:   0
 * Maximum Difference:   0
 * ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ */

#include "macro.h"
#include <stdio.h>
#include "mathevrc.h"
#include "mathdp31.h"
#include "mathadv.h"

void Bitpack(
				short in,
				unsigned short *TrWords,
				short NoOfBits,
				short *ptr
)
{
	short temp;
	unsigned short *WordPtr;

	WordPtr = TrWords + ptr[1];
	*ptr = sub(*ptr, NoOfBits);
	if (*ptr >= 0)
	{
/* NOTE: Creating *WordPtr requires an unsigned shift.  There isn't a fixed
 * point prototype for an unsigned shift, so I kept the C version. */
		*WordPtr = *WordPtr | (in << *ptr);
	}
	else
	{
		temp = shr(in, negate(*ptr));
		*WordPtr = *WordPtr | temp;
		WordPtr++;
		*ptr = add(*ptr, 16);
		*WordPtr = (short) ((long) (L_shl((long) in, *ptr)) & 0xffff);
		ptr[1] += 1;
	}
}