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components/bt/host/bluedroid/external/sbc/encoder/srce/sbc_encoder.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.
*
******************************************************************************/
/******************************************************************************
*
* contains code for encoder flow and initalization of encoder
*
******************************************************************************/
#include <string.h>
#include "common/bt_target.h"
#include "sbc_encoder.h"
#include "sbc_enc_func_declare.h"
#if (defined(SBC_ENC_INCLUDED) && SBC_ENC_INCLUDED == TRUE)
SINT16 EncMaxShiftCounter;
#if (SBC_JOINT_STE_INCLUDED == TRUE)
SINT32 s32LRDiff[SBC_MAX_NUM_OF_BLOCKS] = {0};
SINT32 s32LRSum[SBC_MAX_NUM_OF_BLOCKS] = {0};
#endif
void SBC_Encoder(SBC_ENC_PARAMS *pstrEncParams)
{
SINT32 s32Ch; /* counter for ch*/
SINT32 s32Sb; /* counter for sub-band*/
UINT32 u32Count, maxBit = 0; /* loop count*/
SINT32 s32MaxValue; /* temp variable to store max value */
SINT16 *ps16ScfL;
SINT32 *SbBuffer;
SINT32 s32Blk; /* counter for block*/
SINT32 s32NumOfBlocks = pstrEncParams->s16NumOfBlocks;
#if (SBC_JOINT_STE_INCLUDED == TRUE)
SINT32 s32MaxValue2;
UINT32 u32CountSum, u32CountDiff;
SINT32 *pSum, *pDiff;
#endif
register SINT32 s32NumOfSubBands = pstrEncParams->s16NumOfSubBands;
pstrEncParams->pu8NextPacket = pstrEncParams->pu8Packet;
#if (SBC_NO_PCM_CPY_OPTION == TRUE)
pstrEncParams->ps16NextPcmBuffer = pstrEncParams->ps16PcmBuffer;
#else
pstrEncParams->ps16NextPcmBuffer = pstrEncParams->as16PcmBuffer;
#endif
do {
/* SBC ananlysis filter*/
if (s32NumOfSubBands == 4) {
SbcAnalysisFilter4(pstrEncParams);
} else {
SbcAnalysisFilter8(pstrEncParams);
}
/* compute the scale factor, and save the max */
ps16ScfL = pstrEncParams->as16ScaleFactor;
s32Ch = pstrEncParams->s16NumOfChannels * s32NumOfSubBands;
pstrEncParams->ps16NextPcmBuffer += s32Ch * s32NumOfBlocks; /* in case of multible sbc frame to encode update the pcm pointer */
for (s32Sb = 0; s32Sb < s32Ch; s32Sb++) {
SbBuffer = pstrEncParams->s32SbBuffer + s32Sb;
s32MaxValue = 0;
for (s32Blk = s32NumOfBlocks; s32Blk > 0; s32Blk--) {
if (s32MaxValue < abs32(*SbBuffer)) {
s32MaxValue = abs32(*SbBuffer);
}
SbBuffer += s32Ch;
}
u32Count = (s32MaxValue > 0x800000) ? 9 : 0;
for ( ; u32Count < 15; u32Count++) {
if (s32MaxValue <= (SINT32)(0x8000 << u32Count)) {
break;
}
}
*ps16ScfL++ = (SINT16)u32Count;
if (u32Count > maxBit) {
maxBit = u32Count;
}
}
/* In case of JS processing,check whether to use JS */
#if (SBC_JOINT_STE_INCLUDED == TRUE)
if (pstrEncParams->s16ChannelMode == SBC_JOINT_STEREO) {
/* Calculate sum and differance scale factors for making JS decision */
ps16ScfL = pstrEncParams->as16ScaleFactor ;
/* calculate the scale factor of Joint stereo max sum and diff */
for (s32Sb = 0; s32Sb < s32NumOfSubBands - 1; s32Sb++) {
SbBuffer = pstrEncParams->s32SbBuffer + s32Sb;
s32MaxValue2 = 0;
s32MaxValue = 0;
pSum = s32LRSum;
pDiff = s32LRDiff;
for (s32Blk = 0; s32Blk < s32NumOfBlocks; s32Blk++) {
*pSum = (*SbBuffer + * (SbBuffer + s32NumOfSubBands)) >> 1;
if (abs32(*pSum) > s32MaxValue) {
s32MaxValue = abs32(*pSum);
}
pSum++;
*pDiff = (*SbBuffer - * (SbBuffer + s32NumOfSubBands)) >> 1;
if (abs32(*pDiff) > s32MaxValue2) {
s32MaxValue2 = abs32(*pDiff);
}
pDiff++;
SbBuffer += s32Ch;
}
u32Count = (s32MaxValue > 0x800000) ? 9 : 0;
for ( ; u32Count < 15; u32Count++) {
if (s32MaxValue <= (SINT32)(0x8000 << u32Count)) {
break;
}
}
u32CountSum = u32Count;
u32Count = (s32MaxValue2 > 0x800000) ? 9 : 0;
for ( ; u32Count < 15; u32Count++) {
if (s32MaxValue2 <= (SINT32)(0x8000 << u32Count)) {
break;
}
}
u32CountDiff = u32Count;
if ( (*ps16ScfL + * (ps16ScfL + s32NumOfSubBands)) > (SINT16)(u32CountSum + u32CountDiff) ) {
if (u32CountSum > maxBit) {
maxBit = u32CountSum;
}
if (u32CountDiff > maxBit) {
maxBit = u32CountDiff;
}
*ps16ScfL = (SINT16)u32CountSum;
*(ps16ScfL + s32NumOfSubBands) = (SINT16)u32CountDiff;
SbBuffer = pstrEncParams->s32SbBuffer + s32Sb;
pSum = s32LRSum;
pDiff = s32LRDiff;
for (s32Blk = 0; s32Blk < s32NumOfBlocks; s32Blk++) {
*SbBuffer = *pSum;
*(SbBuffer + s32NumOfSubBands) = *pDiff;
SbBuffer += s32NumOfSubBands << 1;
pSum++;
pDiff++;
}
pstrEncParams->as16Join[s32Sb] = 1;
} else {
pstrEncParams->as16Join[s32Sb] = 0;
}
ps16ScfL++;
}
pstrEncParams->as16Join[s32Sb] = 0;
}
#endif
pstrEncParams->s16MaxBitNeed = (SINT16)maxBit;
/* bit allocation */
if ((pstrEncParams->s16ChannelMode == SBC_STEREO) || (pstrEncParams->s16ChannelMode == SBC_JOINT_STEREO)) {
sbc_enc_bit_alloc_ste(pstrEncParams);
} else {
sbc_enc_bit_alloc_mono(pstrEncParams);
}
/* Quantize the encoded audio */
EncPacking(pstrEncParams);
} while (--(pstrEncParams->u8NumPacketToEncode));
pstrEncParams->u8NumPacketToEncode = 1; /* default is one for retrocompatibility purpose */
}
/****************************************************************************
* InitSbcAnalysisFilt - Initalizes the input data to 0
*
* RETURNS : N/A
*/
void SBC_Encoder_Init(SBC_ENC_PARAMS *pstrEncParams)
{
UINT16 s16SamplingFreq; /*temp variable to store smpling freq*/
SINT16 s16Bitpool; /*to store bit pool value*/
SINT16 s16BitRate; /*to store bitrate*/
SINT16 s16FrameLen; /*to store frame length*/
UINT16 HeaderParams;
pstrEncParams->u8NumPacketToEncode = 1; /* default is one for retrocompatibility purpose */
if (pstrEncParams->sbc_mode != SBC_MODE_MSBC) {
/* Required number of channels */
if (pstrEncParams->s16ChannelMode == SBC_MONO) {
pstrEncParams->s16NumOfChannels = 1;
} else {
pstrEncParams->s16NumOfChannels = 2;
}
/* Bit pool calculation */
if (pstrEncParams->s16SamplingFreq == SBC_sf16000) {
s16SamplingFreq = 16000;
} else if (pstrEncParams->s16SamplingFreq == SBC_sf32000) {
s16SamplingFreq = 32000;
} else if (pstrEncParams->s16SamplingFreq == SBC_sf44100) {
s16SamplingFreq = 44100;
} else {
s16SamplingFreq = 48000;
}
if ( (pstrEncParams->s16ChannelMode == SBC_JOINT_STEREO)
|| (pstrEncParams->s16ChannelMode == SBC_STEREO) ) {
s16Bitpool = (SINT16)( (pstrEncParams->u16BitRate *
pstrEncParams->s16NumOfSubBands * 1000 / s16SamplingFreq)
- ( (32 + (4 * pstrEncParams->s16NumOfSubBands *
pstrEncParams->s16NumOfChannels)
+ ( (pstrEncParams->s16ChannelMode - 2) *
pstrEncParams->s16NumOfSubBands ) )
/ pstrEncParams->s16NumOfBlocks) );
s16FrameLen = 4 + (4 * pstrEncParams->s16NumOfSubBands *
pstrEncParams->s16NumOfChannels) / 8
+ ( ((pstrEncParams->s16ChannelMode - 2) *
pstrEncParams->s16NumOfSubBands)
+ (pstrEncParams->s16NumOfBlocks * s16Bitpool) ) / 8;
s16BitRate = (8 * s16FrameLen * s16SamplingFreq)
/ (pstrEncParams->s16NumOfSubBands *
pstrEncParams->s16NumOfBlocks * 1000);
if (s16BitRate > pstrEncParams->u16BitRate) {
s16Bitpool--;
}
if (pstrEncParams->s16NumOfSubBands == 8) {
pstrEncParams->s16BitPool = (s16Bitpool > 255) ? 255 : s16Bitpool;
} else {
pstrEncParams->s16BitPool = (s16Bitpool > 128) ? 128 : s16Bitpool;
}
} else {
s16Bitpool = (SINT16)( ((pstrEncParams->s16NumOfSubBands *
pstrEncParams->u16BitRate * 1000)
/ (s16SamplingFreq * pstrEncParams->s16NumOfChannels))
- ( ( (32 / pstrEncParams->s16NumOfChannels) +
(4 * pstrEncParams->s16NumOfSubBands) )
/ pstrEncParams->s16NumOfBlocks ) );
pstrEncParams->s16BitPool = (s16Bitpool >
(16 * pstrEncParams->s16NumOfSubBands))
? (16 * pstrEncParams->s16NumOfSubBands) : s16Bitpool;
}
if (pstrEncParams->s16BitPool < 0) {
pstrEncParams->s16BitPool = 0;
}
/* sampling freq */
HeaderParams = ((pstrEncParams->s16SamplingFreq & 3) << 6);
/* number of blocks*/
HeaderParams |= (((pstrEncParams->s16NumOfBlocks - 4) & 12) << 2);
/* channel mode: mono, dual...*/
HeaderParams |= ((pstrEncParams->s16ChannelMode & 3) << 2);
/* Loudness or SNR */
HeaderParams |= ((pstrEncParams->s16AllocationMethod & 1) << 1);
HeaderParams |= ((pstrEncParams->s16NumOfSubBands >> 3) & 1); /*4 or 8*/
pstrEncParams->FrameHeader = HeaderParams;
} else {
// mSBC
// Use mSBC encoding parameters to reset the control field
/* Required number of channels: 1 */
pstrEncParams->s16ChannelMode = SBC_MONO;
pstrEncParams->s16NumOfChannels = 1;
/* Required Sampling frequency : 16KHz */
pstrEncParams->s16SamplingFreq = SBC_sf16000;
/* Bit pool value: 26 */
pstrEncParams->s16BitPool = 26;
/* number of subbands: 8 */
pstrEncParams->s16NumOfSubBands = 8;
/* number of blocks: 15 */
pstrEncParams->s16NumOfBlocks = 15;
/* allocation method: loudness */
pstrEncParams->s16AllocationMethod = SBC_LOUDNESS;
/* set the header paramers, unused for mSBC */
pstrEncParams->FrameHeader = 0;
}
if (pstrEncParams->s16NumOfSubBands == 4) {
if (pstrEncParams->s16NumOfChannels == 1) {
EncMaxShiftCounter = ((ENC_VX_BUFFER_SIZE - 4 * 10) >> 2) << 2;
} else {
EncMaxShiftCounter = ((ENC_VX_BUFFER_SIZE - 4 * 10 * 2) >> 3) << 2;
}
} else {
if (pstrEncParams->s16NumOfChannels == 1) {
EncMaxShiftCounter = ((ENC_VX_BUFFER_SIZE - 8 * 10) >> 3) << 3;
} else {
EncMaxShiftCounter = ((ENC_VX_BUFFER_SIZE - 8 * 10 * 2) >> 4) << 3;
}
}
APPL_TRACE_EVENT("SBC_Encoder_Init : bitrate %d, bitpool %d",
pstrEncParams->u16BitRate, pstrEncParams->s16BitPool);
SbcAnalysisInit();
}
#endif /* #if (defined(SBC_ENC_INCLUDED) && SBC_ENC_INCLUDED == TRUE) */
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