diff options
Diffstat (limited to 'embdrv/sbc/encoder/srce/sbc_enc_bit_alloc_mono.c')
| -rw-r--r-- | embdrv/sbc/encoder/srce/sbc_enc_bit_alloc_mono.c | 65 |
1 files changed, 38 insertions, 27 deletions
diff --git a/embdrv/sbc/encoder/srce/sbc_enc_bit_alloc_mono.c b/embdrv/sbc/encoder/srce/sbc_enc_bit_alloc_mono.c index c8b13a9..c033e24 100644 --- a/embdrv/sbc/encoder/srce/sbc_enc_bit_alloc_mono.c +++ b/embdrv/sbc/encoder/srce/sbc_enc_bit_alloc_mono.c @@ -1,32 +1,43 @@ /****************************************************************************** -** -** File Name: $RCSfile: sbc_enc_bit_alloc_mono.c,v $ -** -** Description: This file contains the code for bit allocation algorithm. -** It calculates the number of bits required for the encoded stream of data. -** -** Revision : $Id: sbc_enc_bit_alloc_mono.c,v 1.9 2006/03/31 17:16:35 mjougit Exp $ -** -** Copyright (c) 1999-2002, Widcomm Inc., All Rights Reserved. -** Widcomm Bluetooth Core. Proprietary and confidential. -** -******************************************************************************/ + * + * 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" /*global arrays*/ -const SINT16 sbc_enc_as16Offset4[4][4] = { {-1, 0, 0, 0}, {-2, 0, 0, 1}, +const SINT16 sbc_enc_as16Offset4[4][4] = { {-1, 0, 0, 0}, {-2, 0, 0, 1}, {-2, 0, 0, 1}, {-2, 0, 0, 1} }; -const SINT16 sbc_enc_as16Offset8[4][8] = { {-2, 0, 0, 0, 0, 0, 0, 1}, +const SINT16 sbc_enc_as16Offset8[4][8] = { {-2, 0, 0, 0, 0, 0, 0, 1}, {-3, 0, 0, 0, 0, 0, 1, 2}, - {-4, 0, 0, 0, 0, 0, 1, 2}, + {-4, 0, 0, 0, 0, 0, 1, 2}, {-4, 0, 0, 0, 0, 0, 1, 2} }; /**************************************************************************** * BitAlloc - Calculates the required number of bits for the given scale factor -* and the number of subbands. +* and the number of subbands. * * RETURNS : N/A */ @@ -78,8 +89,8 @@ void sbc_enc_bit_alloc_mono(SBC_ENC_PARAMS *pstrCodecParams) *(ps16GenBufPtr) = -5; else { - s32Loudness = - (SINT32)(pstrCodecParams->as16ScaleFactor[s32Ch*s32NumOfSubBands+s32Sb] + s32Loudness = + (SINT32)(pstrCodecParams->as16ScaleFactor[s32Ch*s32NumOfSubBands+s32Sb] - *ps16GenTabPtr); if(s32Loudness > 0) *(ps16GenBufPtr) = (SINT16)(s32Loudness >>1); @@ -89,7 +100,7 @@ void sbc_enc_bit_alloc_mono(SBC_ENC_PARAMS *pstrCodecParams) ps16GenBufPtr++; ps16GenTabPtr++; } - + } /* max bitneed index is searched*/ @@ -112,7 +123,7 @@ void sbc_enc_bit_alloc_mono(SBC_ENC_PARAMS *pstrCodecParams) s32BitSlice --; s32BitCount -= s32SliceCount; s32SliceCount = 0; - + for(s32Sb=0; s32Sb<s32NumOfSubBands; s32Sb++) { if( (((*ps16GenBufPtr-s32BitSlice)< 16) && (*ps16GenBufPtr-s32BitSlice) >= 1)) @@ -123,17 +134,17 @@ void sbc_enc_bit_alloc_mono(SBC_ENC_PARAMS *pstrCodecParams) s32SliceCount++; } ps16GenBufPtr++; - + }/*end of for*/ ps16GenBufPtr = ps16BitNeed + s32Ch*s32NumOfSubBands; }while(s32BitCount-s32SliceCount>0); - + if(s32BitCount == 0) { s32BitCount -= s32SliceCount; s32BitSlice --; } - + /*Bits are distributed until the last bitslice is reached*/ ps16GenArrPtr = pstrCodecParams->as16Bits+s32Ch*s32NumOfSubBands; ps16GenBufPtr = ps16BitNeed + s32Ch*s32NumOfSubBands; @@ -142,7 +153,7 @@ void sbc_enc_bit_alloc_mono(SBC_ENC_PARAMS *pstrCodecParams) if(*(ps16GenBufPtr) < s32BitSlice+2) *(ps16GenArrPtr) = 0; else - *(ps16GenArrPtr) = ((*(ps16GenBufPtr)-s32BitSlice)<16) ? + *(ps16GenArrPtr) = ((*(ps16GenBufPtr)-s32BitSlice)<16) ? (SINT16)(*(ps16GenBufPtr)-s32BitSlice) : 16; ps16GenBufPtr++; @@ -159,7 +170,7 @@ void sbc_enc_bit_alloc_mono(SBC_ENC_PARAMS *pstrCodecParams) (*(ps16GenArrPtr))++; s32BitCount--; } - else if( (*(ps16GenBufPtr) == s32BitSlice+1) && + else if( (*(ps16GenBufPtr) == s32BitSlice+1) && (s32BitCount > 1) ) { *(ps16GenArrPtr) = 2; @@ -170,8 +181,8 @@ void sbc_enc_bit_alloc_mono(SBC_ENC_PARAMS *pstrCodecParams) ps16GenBufPtr++; } ps16GenArrPtr = pstrCodecParams->as16Bits+s32Ch*s32NumOfSubBands; - - + + s32Sb=0; while( (s32BitCount > 0) && (s32Sb < s32NumOfSubBands) ) { |