404 lines
16 KiB
C
404 lines
16 KiB
C
/******************************************************************************
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*
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* Copyright (C) 1999-2012 Broadcom Corporation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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******************************************************************************/
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/******************************************************************************
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*
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* contains code for encoder flow and initalization of encoder
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*
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******************************************************************************/
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#include <string.h>
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#include "bt_target.h"
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#include "sbc_encoder.h"
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#include "sbc_enc_func_declare.h"
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#if (defined(SBC_ENC_INCLUDED) && SBC_ENC_INCLUDED == TRUE)
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SINT16 EncMaxShiftCounter;
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/*************************************************************************************************
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* SBC encoder scramble code
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* Purpose: to tie the SBC code with BTE/mobile stack code,
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* especially for the case when the SBC is ported into a third-party Multimedia chip
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*
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* Algorithm:
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* init process: all counters reset to 0,
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* calculate base_index: (6 + s16NumOfChannels*s16NumOfSubBands/2)
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* scramble side: the init process happens every time SBC_Encoder_Init() is called.
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* descramble side: it would be nice to know if he "init" process has happened.
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* alter the SBC SYNC word 0x9C (1001 1100) to 0x8C (1000 1100).
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*
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* scramble process:
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* The CRC byte:
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* Every SBC frame has a frame header.
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* The 1st byte is the sync word and the following 2 bytes are about the stream format.
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* They are supposed to be "constant" within a "song"
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* The 4th byte is the CRC byte. The CRC byte is bound to be random.
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* Derive 2 items from the CRC byte; one is the "use" bit, the other is the "index".
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*
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* SBC keeps 2 sets of "use" & "index"; derived the current and the previous frame.
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*
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* The "use" bit is any bit in SBC_PRTC_USE_MASK is set.
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* If set, SBC uses the "index" from the current frame.
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* If not set, SBC uses the "index" from the previous frame or 0.
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*
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* index = (CRC & 0x3) + ((CRC & 0x30) >> 2) // 8 is the max index
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*
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* if(index > 0)
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* {
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* p = &u8frame[base_index];
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* if((index&1)&&(u16PacketLength > (base_index+index*2)))
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* {
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* // odd index: swap 2 bytes
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* tmp = p[index];
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* p[index] = p[index*2];
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* p[index*2] = tmp;
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* }
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* else
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* {
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* // even index: shift by 3
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* tmp = (p[index] >> 5) + (p[index] << 3);
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* p[index] = tmp;
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* }
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* }
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* //else index is 0. The frame stays unaltered
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*
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*/
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#define SBC_PRTC_CRC_IDX 3
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#define SBC_PRTC_USE_MASK 0x64
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#define SBC_PRTC_SYNC_MASK 0x10
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#define SBC_PRTC_CIDX 0
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#define SBC_PRTC_LIDX 1
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typedef struct {
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UINT8 use;
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UINT8 idx;
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} tSBC_FR_CB;
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typedef struct {
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tSBC_FR_CB fr[2];
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UINT8 init;
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UINT8 index;
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UINT8 base;
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} tSBC_PRTC_CB;
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tSBC_PRTC_CB sbc_prtc_cb;
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#define SBC_PRTC_IDX(sc) (((sc) & 0x3) + (((sc) & 0x30) >> 2))
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#define SBC_PRTC_CHK_INIT(ar) {if(sbc_prtc_cb.init == 0){sbc_prtc_cb.init=1; ar[0] &= ~SBC_PRTC_SYNC_MASK;}}
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#define SBC_PRTC_C2L() {p_last=&sbc_prtc_cb.fr[SBC_PRTC_LIDX]; p_cur=&sbc_prtc_cb.fr[SBC_PRTC_CIDX]; \
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p_last->idx = p_cur->idx; p_last->use = p_cur->use;}
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#define SBC_PRTC_GETC(ar) {p_cur->use = ar[SBC_PRTC_CRC_IDX] & SBC_PRTC_USE_MASK; \
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p_cur->idx = SBC_PRTC_IDX(ar[SBC_PRTC_CRC_IDX]);}
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#define SBC_PRTC_CHK_CRC(ar) {SBC_PRTC_C2L();SBC_PRTC_GETC(ar);sbc_prtc_cb.index = (p_cur->use)?SBC_PRTC_CIDX:SBC_PRTC_LIDX;}
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#define SBC_PRTC_SCRMB(ar) {idx = sbc_prtc_cb.fr[sbc_prtc_cb.index].idx; \
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if(idx > 0){if((idx&1)&&(pstrEncParams->u16PacketLength > (sbc_prtc_cb.base+(idx<<1)))) {tmp2=idx<<1; tmp=ar[idx];ar[idx]=ar[tmp2];ar[tmp2]=tmp;} \
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else{tmp2=ar[idx]; tmp=(tmp2>>5)+(tmp2<<3);ar[idx]=(UINT8)tmp;}}}
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#if (SBC_JOINT_STE_INCLUDED == TRUE)
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SINT32 s32LRDiff[SBC_MAX_NUM_OF_BLOCKS] = {0};
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SINT32 s32LRSum[SBC_MAX_NUM_OF_BLOCKS] = {0};
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#endif
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void SBC_Encoder(SBC_ENC_PARAMS *pstrEncParams)
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{
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SINT32 s32Ch; /* counter for ch*/
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SINT32 s32Sb; /* counter for sub-band*/
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UINT32 u32Count, maxBit = 0; /* loop count*/
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SINT32 s32MaxValue; /* temp variable to store max value */
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SINT16 *ps16ScfL;
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SINT32 *SbBuffer;
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SINT32 s32Blk; /* counter for block*/
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SINT32 s32NumOfBlocks = pstrEncParams->s16NumOfBlocks;
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#if (SBC_JOINT_STE_INCLUDED == TRUE)
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SINT32 s32MaxValue2;
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UINT32 u32CountSum, u32CountDiff;
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SINT32 *pSum, *pDiff;
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#endif
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UINT8 *pu8;
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tSBC_FR_CB *p_cur, *p_last;
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UINT32 idx, tmp, tmp2;
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register SINT32 s32NumOfSubBands = pstrEncParams->s16NumOfSubBands;
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pstrEncParams->pu8NextPacket = pstrEncParams->pu8Packet;
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#if (SBC_NO_PCM_CPY_OPTION == TRUE)
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pstrEncParams->ps16NextPcmBuffer = pstrEncParams->ps16PcmBuffer;
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#else
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pstrEncParams->ps16NextPcmBuffer = pstrEncParams->as16PcmBuffer;
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#endif
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do {
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/* SBC ananlysis filter*/
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if (s32NumOfSubBands == 4) {
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SbcAnalysisFilter4(pstrEncParams);
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} else {
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SbcAnalysisFilter8(pstrEncParams);
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}
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/* compute the scale factor, and save the max */
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ps16ScfL = pstrEncParams->as16ScaleFactor;
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s32Ch = pstrEncParams->s16NumOfChannels * s32NumOfSubBands;
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pstrEncParams->ps16NextPcmBuffer += s32Ch * s32NumOfBlocks; /* in case of multible sbc frame to encode update the pcm pointer */
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for (s32Sb = 0; s32Sb < s32Ch; s32Sb++) {
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SbBuffer = pstrEncParams->s32SbBuffer + s32Sb;
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s32MaxValue = 0;
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for (s32Blk = s32NumOfBlocks; s32Blk > 0; s32Blk--) {
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if (s32MaxValue < abs32(*SbBuffer)) {
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s32MaxValue = abs32(*SbBuffer);
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}
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SbBuffer += s32Ch;
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}
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u32Count = (s32MaxValue > 0x800000) ? 9 : 0;
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for ( ; u32Count < 15; u32Count++) {
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if (s32MaxValue <= (SINT32)(0x8000 << u32Count)) {
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break;
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}
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}
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*ps16ScfL++ = (SINT16)u32Count;
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if (u32Count > maxBit) {
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maxBit = u32Count;
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}
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}
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/* In case of JS processing,check whether to use JS */
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#if (SBC_JOINT_STE_INCLUDED == TRUE)
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if (pstrEncParams->s16ChannelMode == SBC_JOINT_STEREO) {
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/* Calculate sum and differance scale factors for making JS decision */
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ps16ScfL = pstrEncParams->as16ScaleFactor ;
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/* calculate the scale factor of Joint stereo max sum and diff */
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for (s32Sb = 0; s32Sb < s32NumOfSubBands - 1; s32Sb++) {
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SbBuffer = pstrEncParams->s32SbBuffer + s32Sb;
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s32MaxValue2 = 0;
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s32MaxValue = 0;
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pSum = s32LRSum;
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pDiff = s32LRDiff;
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for (s32Blk = 0; s32Blk < s32NumOfBlocks; s32Blk++) {
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*pSum = (*SbBuffer + * (SbBuffer + s32NumOfSubBands)) >> 1;
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if (abs32(*pSum) > s32MaxValue) {
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s32MaxValue = abs32(*pSum);
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}
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pSum++;
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*pDiff = (*SbBuffer - * (SbBuffer + s32NumOfSubBands)) >> 1;
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if (abs32(*pDiff) > s32MaxValue2) {
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s32MaxValue2 = abs32(*pDiff);
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}
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pDiff++;
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SbBuffer += s32Ch;
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}
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u32Count = (s32MaxValue > 0x800000) ? 9 : 0;
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for ( ; u32Count < 15; u32Count++) {
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if (s32MaxValue <= (SINT32)(0x8000 << u32Count)) {
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break;
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}
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}
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u32CountSum = u32Count;
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u32Count = (s32MaxValue2 > 0x800000) ? 9 : 0;
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for ( ; u32Count < 15; u32Count++) {
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if (s32MaxValue2 <= (SINT32)(0x8000 << u32Count)) {
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break;
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}
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}
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u32CountDiff = u32Count;
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if ( (*ps16ScfL + * (ps16ScfL + s32NumOfSubBands)) > (SINT16)(u32CountSum + u32CountDiff) ) {
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if (u32CountSum > maxBit) {
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maxBit = u32CountSum;
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}
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if (u32CountDiff > maxBit) {
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maxBit = u32CountDiff;
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}
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*ps16ScfL = (SINT16)u32CountSum;
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*(ps16ScfL + s32NumOfSubBands) = (SINT16)u32CountDiff;
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SbBuffer = pstrEncParams->s32SbBuffer + s32Sb;
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pSum = s32LRSum;
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pDiff = s32LRDiff;
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for (s32Blk = 0; s32Blk < s32NumOfBlocks; s32Blk++) {
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*SbBuffer = *pSum;
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*(SbBuffer + s32NumOfSubBands) = *pDiff;
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SbBuffer += s32NumOfSubBands << 1;
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pSum++;
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pDiff++;
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}
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pstrEncParams->as16Join[s32Sb] = 1;
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} else {
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pstrEncParams->as16Join[s32Sb] = 0;
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}
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ps16ScfL++;
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}
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pstrEncParams->as16Join[s32Sb] = 0;
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}
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#endif
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pstrEncParams->s16MaxBitNeed = (SINT16)maxBit;
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/* bit allocation */
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if ((pstrEncParams->s16ChannelMode == SBC_STEREO) || (pstrEncParams->s16ChannelMode == SBC_JOINT_STEREO)) {
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sbc_enc_bit_alloc_ste(pstrEncParams);
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} else {
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sbc_enc_bit_alloc_mono(pstrEncParams);
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}
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/* save the beginning of the frame. pu8NextPacket is modified in EncPacking() */
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pu8 = pstrEncParams->pu8NextPacket;
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/* Quantize the encoded audio */
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EncPacking(pstrEncParams);
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/* scramble the code */
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SBC_PRTC_CHK_INIT(pu8);
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SBC_PRTC_CHK_CRC(pu8);
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#if 0
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if (pstrEncParams->u16PacketLength > ((sbc_prtc_cb.fr[sbc_prtc_cb.index].idx * 2) + sbc_prtc_cb.base)) {
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printf("len: %d, idx: %d\n", pstrEncParams->u16PacketLength, sbc_prtc_cb.fr[sbc_prtc_cb.index].idx);
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} else {
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printf("len: %d, idx: %d!!!!\n", pstrEncParams->u16PacketLength, sbc_prtc_cb.fr[sbc_prtc_cb.index].idx);
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}
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#endif
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SBC_PRTC_SCRMB((&pu8[sbc_prtc_cb.base]));
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} while (--(pstrEncParams->u8NumPacketToEncode));
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pstrEncParams->u8NumPacketToEncode = 1; /* default is one for retrocompatibility purpose */
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}
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/****************************************************************************
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* InitSbcAnalysisFilt - Initalizes the input data to 0
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*
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* RETURNS : N/A
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*/
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void SBC_Encoder_Init(SBC_ENC_PARAMS *pstrEncParams)
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{
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UINT16 s16SamplingFreq; /*temp variable to store smpling freq*/
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SINT16 s16Bitpool; /*to store bit pool value*/
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SINT16 s16BitRate; /*to store bitrate*/
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SINT16 s16FrameLen; /*to store frame length*/
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UINT16 HeaderParams;
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pstrEncParams->u8NumPacketToEncode = 1; /* default is one for retrocompatibility purpose */
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/* Required number of channels */
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if (pstrEncParams->s16ChannelMode == SBC_MONO) {
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pstrEncParams->s16NumOfChannels = 1;
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} else {
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pstrEncParams->s16NumOfChannels = 2;
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}
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/* Bit pool calculation */
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if (pstrEncParams->s16SamplingFreq == SBC_sf16000) {
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s16SamplingFreq = 16000;
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} else if (pstrEncParams->s16SamplingFreq == SBC_sf32000) {
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s16SamplingFreq = 32000;
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} else if (pstrEncParams->s16SamplingFreq == SBC_sf44100) {
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s16SamplingFreq = 44100;
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} else {
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s16SamplingFreq = 48000;
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}
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if ( (pstrEncParams->s16ChannelMode == SBC_JOINT_STEREO)
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|| (pstrEncParams->s16ChannelMode == SBC_STEREO) ) {
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s16Bitpool = (SINT16)( (pstrEncParams->u16BitRate *
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pstrEncParams->s16NumOfSubBands * 1000 / s16SamplingFreq)
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- ( (32 + (4 * pstrEncParams->s16NumOfSubBands *
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pstrEncParams->s16NumOfChannels)
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+ ( (pstrEncParams->s16ChannelMode - 2) *
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pstrEncParams->s16NumOfSubBands ) )
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/ pstrEncParams->s16NumOfBlocks) );
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s16FrameLen = 4 + (4 * pstrEncParams->s16NumOfSubBands *
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pstrEncParams->s16NumOfChannels) / 8
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+ ( ((pstrEncParams->s16ChannelMode - 2) *
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pstrEncParams->s16NumOfSubBands)
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+ (pstrEncParams->s16NumOfBlocks * s16Bitpool) ) / 8;
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s16BitRate = (8 * s16FrameLen * s16SamplingFreq)
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/ (pstrEncParams->s16NumOfSubBands *
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pstrEncParams->s16NumOfBlocks * 1000);
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if (s16BitRate > pstrEncParams->u16BitRate) {
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s16Bitpool--;
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}
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if (pstrEncParams->s16NumOfSubBands == 8) {
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pstrEncParams->s16BitPool = (s16Bitpool > 255) ? 255 : s16Bitpool;
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} else {
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pstrEncParams->s16BitPool = (s16Bitpool > 128) ? 128 : s16Bitpool;
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}
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} else {
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s16Bitpool = (SINT16)( ((pstrEncParams->s16NumOfSubBands *
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pstrEncParams->u16BitRate * 1000)
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/ (s16SamplingFreq * pstrEncParams->s16NumOfChannels))
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- ( ( (32 / pstrEncParams->s16NumOfChannels) +
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(4 * pstrEncParams->s16NumOfSubBands) )
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/ pstrEncParams->s16NumOfBlocks ) );
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pstrEncParams->s16BitPool = (s16Bitpool >
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(16 * pstrEncParams->s16NumOfSubBands))
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? (16 * pstrEncParams->s16NumOfSubBands) : s16Bitpool;
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}
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if (pstrEncParams->s16BitPool < 0) {
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pstrEncParams->s16BitPool = 0;
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}
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/* sampling freq */
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HeaderParams = ((pstrEncParams->s16SamplingFreq & 3) << 6);
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/* number of blocks*/
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HeaderParams |= (((pstrEncParams->s16NumOfBlocks - 4) & 12) << 2);
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/* channel mode: mono, dual...*/
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HeaderParams |= ((pstrEncParams->s16ChannelMode & 3) << 2);
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/* Loudness or SNR */
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HeaderParams |= ((pstrEncParams->s16AllocationMethod & 1) << 1);
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HeaderParams |= ((pstrEncParams->s16NumOfSubBands >> 3) & 1); /*4 or 8*/
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pstrEncParams->FrameHeader = HeaderParams;
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if (pstrEncParams->s16NumOfSubBands == 4) {
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if (pstrEncParams->s16NumOfChannels == 1) {
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EncMaxShiftCounter = ((ENC_VX_BUFFER_SIZE - 4 * 10) >> 2) << 2;
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} else {
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EncMaxShiftCounter = ((ENC_VX_BUFFER_SIZE - 4 * 10 * 2) >> 3) << 2;
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}
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} else {
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if (pstrEncParams->s16NumOfChannels == 1) {
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EncMaxShiftCounter = ((ENC_VX_BUFFER_SIZE - 8 * 10) >> 3) << 3;
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} else {
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EncMaxShiftCounter = ((ENC_VX_BUFFER_SIZE - 8 * 10 * 2) >> 4) << 3;
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}
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}
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APPL_TRACE_EVENT("SBC_Encoder_Init : bitrate %d, bitpool %d",
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pstrEncParams->u16BitRate, pstrEncParams->s16BitPool);
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SbcAnalysisInit();
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memset(&sbc_prtc_cb, 0, sizeof(tSBC_PRTC_CB));
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sbc_prtc_cb.base = 6 + pstrEncParams->s16NumOfChannels * pstrEncParams->s16NumOfSubBands / 2;
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}
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#endif /* #if (defined(SBC_ENC_INCLUDED) && SBC_ENC_INCLUDED == TRUE) */
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