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bitpack.c
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bitpack.c
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/*****************************************************************************/
/* BroadVoice(R)16 (BV16) Floating-Point ANSI-C Source Code */
/* Revision Date: October 5, 2012 */
/* Version 1.2 */
/*****************************************************************************/
/*****************************************************************************/
/* Copyright 2000-2012 Broadcom Corporation */
/* */
/* This software is provided under the GNU Lesser General Public License, */
/* version 2.1, as published by the Free Software Foundation ("LGPL"). */
/* This program is distributed in the hope that it will be useful, but */
/* WITHOUT ANY SUPPORT OR WARRANTY; without even the implied warranty of */
/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the LGPL for */
/* more details. A copy of the LGPL is available at */
/* http://www.broadcom.com/licenses/LGPLv2.1.php, */
/* or by writing to the Free Software Foundation, Inc., */
/* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
/*****************************************************************************/
/*****************************************************************************
bitpack.c: BV16 bit packing routines
$Log$
******************************************************************************/
#include "typedef.h"
#include "bv16cnst.h"
#include "bvcommon.h"
#include "bv16strct.h"
#include "bv16.h"
/****************************************************************************
*
* BV16_BITPACK - BroadVoice16 Encoded Bit Pack Function
*
* PURPOSE:
*
* This function take the encoded bit structure (15 words) and packed it
* into a bit stream (5 words) for sending it across the network.
*
* PROTOTYPE:
* BV16_BitPack ( UINT16 * PackedStream, sBV16bs * BitStruct );
*
* PARAMETERS:
* PackedStream => pointer to the outgoing encoded stream
* BitStruct => pointer to the encoded bit structure
*
* RETURNS:
* Nothing
*
* NOTE:
* The following is the bit table within the bit structure for
* BroadVoice16
*
* Word16 bit_table[] = {
* 7, 7, // LSP
* 7, // Pitch Lag
* 5, // Pitch Gain
* 4, // Excitation Vector Log-Gain
* 5, 5, 5, 5, 5, 5, 5, 5, 5, 5 // Excitation Vector
* };
*
****************************************************************************/
void BV16_BitPack (UWord8 * PackedStream, struct BV16_Bit_Stream * BitStruct )
{
UWord32 temppack;
/* fill the first 16 bit word */
temppack = ( ((UWord32)BitStruct->lspidx[0]) << 25 ); /* 32-7 */
temppack |= ( ((UWord32)BitStruct->lspidx[1]) << 18 ); /* 25-7 */
temppack |= ( ((UWord32)BitStruct->ppidx) << 11 ); /* 18-7 */
/* total=21 */
/* store 1st byte in the payload */
*PackedStream++ = (UWord8)(temppack >> 24);
/* store 2nd byte in the payload */
*PackedStream++ = (UWord8)((temppack << 8) >> 24);
/* clear the upper 16 bits */
temppack = temppack << 16;
temppack |= ( ((UWord32)BitStruct->bqidx) << 22 ); /* 32-(21-16)-5 = 32-10 */
temppack |= ( ((UWord32)BitStruct->gidx) << 18 ); /* 22-4 */
temppack |= ( ((UWord32)BitStruct->qvidx[0]) << 13 ); /* 18-5 */
/* total=19 */
/* store 3rd byte in the payload */
*PackedStream++ = (UWord8)(temppack >> 24);
/* store 4th byte in the payload */
*PackedStream++ = (UWord8)((temppack << 8) >> 24);
/* clear the upper 16 bits */
temppack = temppack << 16;
temppack |= ( ((UWord32)BitStruct->qvidx[1]) << 24 ); /* 32-(19-16)-5 = 32-8 */
temppack |= ( ((UWord32)BitStruct->qvidx[2]) << 19 ); /* 24-5 */
temppack |= ( ((UWord32)BitStruct->qvidx[3]) << 14 ); /* 19-5 */
/* total=18 */
/* store 5th byte in the payload */
*PackedStream++ = (UWord8)(temppack >> 24);
/* store 6th byte in the payload */
*PackedStream++ = (UWord8)((temppack << 8) >> 24);
/* clear the upper 16 bits */
temppack = temppack << 16;
temppack |= ( ((UWord32)BitStruct->qvidx[4]) << 25 ); /* 32-(18-16)-5 = 32-7 */
temppack |= ( ((UWord32)BitStruct->qvidx[5]) << 20 ); /* 25-5 */
temppack |= ( ((UWord32)BitStruct->qvidx[6]) << 15 ); /* 20-5 */
/* total=17 */
/* store 7th byte in the payload */
*PackedStream++ = (UWord8)(temppack >> 24);
/* store 8th byte in the payload */
*PackedStream++ = (UWord8)((temppack << 8) >> 24);
/* clear the upper 16 bits */
temppack = temppack << 16;
temppack |= ( ((UWord32)BitStruct->qvidx[7]) << 26 ); /* 32-(17-16)-5 = 32-6 */
temppack |= ( ((UWord32)BitStruct->qvidx[8]) << 21 ); /* 25-5 */
temppack |= ( ((UWord32)BitStruct->qvidx[9]) << 16 ); /* 20-5 */
/* total=18 */
/* store 9th byte in the payload */
*PackedStream++ = (UWord8)(temppack >> 24);
/* store 10th byte in the payload */
*PackedStream++ = (UWord8)((temppack << 8) >> 24);
return;
}
/****************************************************************************
*
* BV16_BITUNPACK - BroadVoice16 Encoded Bit Unpack Function
*
* PURPOSE:
*
* This function take the encoded bit stream (5 words) and unpack it
* into a bit structure (15 words) for BroadVoice16 decoder.
*
* PROTOTYPE:
* BV16_BitUnPack ( UINT16 * PackedStream, sBV16bs * BitStruct );
*
* PARAMETERS:
* PackedStream => pointer to the incoming encoded bit stream
* BitStruct => pointer to the bit structure for decoder
*
* RETURNS:
* Nothing
*
* NOTE:
* The following is the bit table within the bit structure for
* BroadVoice16
*
* Word16 bit_table[] = {
* 7, 7, // LSP
* 7, // Pitch Lag
* 5, // Pitch Gain
* 4, // Excitation Vector Log-Gain
* 5, 5, 5, 5, 5, 5, 5, 5, 5, 5 // Excitation Vector
* };
*
*
****************************************************************************/
void BV16_BitUnPack (UWord8 * PackedStream, struct BV16_Bit_Stream * BitStruct )
{
UWord32 bitword32;
/* unpack bytes 1 and 2 of bit stream */
bitword32 = (UWord32)*PackedStream++;
bitword32 = (bitword32 << 8) | (UWord32)*PackedStream++;
BitStruct->lspidx[0] = (short)( bitword32 >> 9 );
BitStruct->lspidx[1] = (short)( ( bitword32 & 0x01FF )>> 2 );
/* unpack bytes 3 and 4 of bit stream */
bitword32 = ((bitword32 & 0x0003) << 8) | (UWord32) *PackedStream++;
bitword32 = (bitword32 << 8) | (UWord32)*PackedStream++;
BitStruct->ppidx = (short)( bitword32 >> 11 );
BitStruct->bqidx = (short)( ( bitword32 & 0x07FF ) >> 6 );
BitStruct->gidx = (short)( ( bitword32 & 0x003F ) >> 2 );
/* unpack bytes 5 and 6 of bit stream */
bitword32 = ((bitword32 & 0x0003) << 8) | (UWord32) *PackedStream++;
bitword32 = (bitword32 << 8) | (UWord32)*PackedStream++;
BitStruct->qvidx[0] = (short)( bitword32 >> 13 );
BitStruct->qvidx[1] = (short)( ( bitword32 & 0x1FFF ) >> 8 );
BitStruct->qvidx[2] = (short)( ( bitword32 & 0x00FF ) >> 3 );
/* unpack bytes 7 and 8 of bit stream */
bitword32 = ((bitword32 & 0x0007) << 8) | (UWord32) *PackedStream++;
bitword32 = (bitword32 << 8) | (UWord32)*PackedStream++;
BitStruct->qvidx[3] = (short)( bitword32 >> 14 );
BitStruct->qvidx[4] = (short)( ( bitword32 & 0x3FFF ) >> 9 );
BitStruct->qvidx[5] = (short)( ( bitword32 & 0x01FF ) >> 4 );
/* unpack bytes 9 and 10 of bit stream */
bitword32 = ((bitword32 & 0x000F) << 8) | (UWord32) *PackedStream++;
bitword32 = (bitword32 << 8) | (UWord32)*PackedStream++;
BitStruct->qvidx[6] = (short)( ( bitword32 >> 15 ) );
BitStruct->qvidx[7] = (short)( ( bitword32 & 0x7FFF ) >> 10 );
BitStruct->qvidx[8] = (short)( ( bitword32 & 0x03FF ) >> 5 );
BitStruct->qvidx[9] = (short)( bitword32 & 0x001F );
return;
}