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hpw422移植新的sdk

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xushaoxiang
2026-07-03 18:08:25 +08:00
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component/SBC/encoder/srce/sbc_enc_bit_alloc_ste.c
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/******************************************************************************
*
* Copyright (C) 1999-2012 Broadcom Corporation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
******************************************************************************/
/******************************************************************************
*
* This file contains the code for bit allocation algorithm. It calculates
* the number of bits required for the encoded stream of data.
*
******************************************************************************/
/*Includes*/
#include "sbc_encoder.h"
#include "sbc_enc_func_declare.h"
#include "xc6xxx.h"
/*global arrays*/
extern const SINT16 sbc_enc_as16Offset4[4][4];
extern const SINT16 sbc_enc_as16Offset8[4][8];
/****************************************************************************
* BitAlloc - Calculates the required number of bits for the given scale factor
* and the number of subbands.
*
* RETURNS : N/A
*/
/*__attribute__((section("ram_sbc_code")))*/ void sbc_enc_bit_alloc_ste(SBC_ENC_PARAMS *pstrCodecParams)
{
/* CAUTIOM -> mips optim for arm 32 require to use SINT32 instead of SINT16 */
/* Do not change variable type or name */
SINT32 s32MaxBitNeed; /*to store the max bits needed per sb*/
SINT32 s32BitCount; /*the used number of bits*/
SINT32 s32SliceCount; /*to store hwo many slices can be put in bitpool*/
SINT32 s32BitSlice; /*number of bitslices in bitpool*/
SINT32 s32Sb; /*counter for sub-band*/
SINT32 s32Ch; /*counter for channel*/
SINT16 *ps16BitNeed; /*temp memory to store required number of bits*/
SINT32 s32Loudness; /*used in Loudness calculation*/
SINT16 *ps16GenBufPtr,*pas16ScaleFactor;
SINT16 *ps16GenArrPtr;
SINT16 *ps16GenTabPtr;
SINT32 s32NumOfSubBands = pstrCodecParams->s16NumOfSubBands;
SINT32 s32BitPool = pstrCodecParams->s16BitPool;
/* bitneed values are derived from scale factor */
if (pstrCodecParams->s16AllocationMethod == SBC_SNR)
{
ps16BitNeed = pstrCodecParams->as16ScaleFactor;
s32MaxBitNeed = pstrCodecParams->s16MaxBitNeed;
}
else
{
ps16BitNeed = pstrCodecParams->s16ScartchMemForBitAlloc;
pas16ScaleFactor=pstrCodecParams->as16ScaleFactor;
s32MaxBitNeed = 0;
ps16GenBufPtr = ps16BitNeed;
for (s32Ch = 0; s32Ch < 2; s32Ch++)
{
if (s32NumOfSubBands == 4)
{
ps16GenTabPtr = (SINT16 *)sbc_enc_as16Offset4[pstrCodecParams->s16SamplingFreq];
}
else
{
ps16GenTabPtr = (SINT16 *)sbc_enc_as16Offset8[pstrCodecParams->s16SamplingFreq];
}
for (s32Sb = 0; s32Sb < s32NumOfSubBands; s32Sb++)
{
if (*pas16ScaleFactor == 0)
*ps16GenBufPtr = -5;
else
{
s32Loudness = (SINT32)(*pas16ScaleFactor - *ps16GenTabPtr);
if (s32Loudness > 0)
*ps16GenBufPtr = (SINT16)(s32Loudness >> 1);
else
*ps16GenBufPtr = (SINT16)s32Loudness;
}
if (*ps16GenBufPtr > s32MaxBitNeed)
s32MaxBitNeed = *ps16GenBufPtr;
pas16ScaleFactor++;
ps16GenBufPtr++;
ps16GenTabPtr++;
}
}
}
/* iterative process to find out hwo many bitslices fit into the bitpool */
s32BitSlice = s32MaxBitNeed + 1;
s32BitCount = s32BitPool;
s32SliceCount = 0;
do
{
s32BitSlice --;
s32BitCount -= s32SliceCount;
s32SliceCount = 0;
ps16GenBufPtr = ps16BitNeed;
for (s32Sb = 0; s32Sb < (2*s32NumOfSubBands); s32Sb++)
{
if ( (*ps16GenBufPtr >= (s32BitSlice + 1)) && (*ps16GenBufPtr < (s32BitSlice + 16)) )
{
if (*(ps16GenBufPtr) == (s32BitSlice+1))
s32SliceCount += 2;
else
s32SliceCount++;
}
ps16GenBufPtr++;
}
} while ((s32BitCount-s32SliceCount)>0);
if ((s32BitCount-s32SliceCount) == 0)
{
s32BitCount -= s32SliceCount;
s32BitSlice --;
}
/* Bits are distributed until the last bitslice is reached */
ps16GenBufPtr = ps16BitNeed;
ps16GenArrPtr = pstrCodecParams->as16Bits;
for (s32Ch = 0; s32Ch < 2; s32Ch++)
{
for (s32Sb = 0; s32Sb < s32NumOfSubBands; s32Sb++)
{
if (*ps16GenBufPtr < (s32BitSlice+2))
*ps16GenArrPtr = 0;
else
*ps16GenArrPtr = ((*(ps16GenBufPtr)-s32BitSlice) < 16) ?
(SINT16)(*(ps16GenBufPtr)-s32BitSlice):16;
ps16GenBufPtr++;
ps16GenArrPtr++;
}
}
/* the remaining bits are allocated starting at subband 0 */
s32Ch=0;
s32Sb=0;
ps16GenBufPtr = ps16BitNeed;
ps16GenArrPtr -= 2*s32NumOfSubBands;
while ( (s32BitCount > 0) && (s32Sb < s32NumOfSubBands) )
{
if ( (*(ps16GenArrPtr) >= 2) && (*(ps16GenArrPtr) < 16) )
{
(*(ps16GenArrPtr))++;
s32BitCount--;
}
else if ((*ps16GenBufPtr == (s32BitSlice+1)) && (s32BitCount > 1))
{
*(ps16GenArrPtr) = 2;
s32BitCount -= 2;
}
if(s32Ch == 1)
{
s32Ch = 0;
s32Sb++;
ps16GenBufPtr = ps16BitNeed+s32Sb;
ps16GenArrPtr = pstrCodecParams->as16Bits+s32Sb;
}
else
{
s32Ch =1;
ps16GenBufPtr = ps16BitNeed+s32NumOfSubBands+s32Sb;
ps16GenArrPtr = pstrCodecParams->as16Bits+s32NumOfSubBands+s32Sb;
}
}
s32Ch=0;
s32Sb=0;
ps16GenArrPtr = pstrCodecParams->as16Bits;
while ((s32BitCount >0) && (s32Sb < s32NumOfSubBands))
{
if(*(ps16GenArrPtr) < 16)
{
(*(ps16GenArrPtr))++;
s32BitCount--;
}
if (s32Ch == 1)
{
s32Ch = 0;
s32Sb++;
ps16GenArrPtr = pstrCodecParams->as16Bits+s32Sb;
}
else
{
s32Ch = 1;
ps16GenArrPtr = pstrCodecParams->as16Bits+s32NumOfSubBands+s32Sb;
}
}
}
/*End of BitAlloc() function*/