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259 lines
9.0 KiB
259 lines
9.0 KiB
4 months ago
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/******************************************************************************
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*
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* Copyright 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 "sbc_encoder.h"
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#include <string.h>
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#include "bt_target.h"
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#include "sbc_enc_func_declare.h"
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int16_t EncMaxShiftCounter;
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#if (SBC_JOINT_STE_INCLUDED == TRUE)
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int32_t s32LRDiff[SBC_MAX_NUM_OF_BLOCKS] = {0};
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int32_t s32LRSum[SBC_MAX_NUM_OF_BLOCKS] = {0};
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#endif
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uint32_t SBC_Encode(SBC_ENC_PARAMS* pstrEncParams, int16_t* input,
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uint8_t* output) {
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int32_t s32Ch; /* counter for ch*/
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int32_t s32Sb; /* counter for sub-band*/
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uint32_t u32Count, maxBit = 0; /* loop count*/
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int32_t s32MaxValue; /* temp variable to store max value */
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int16_t* ps16ScfL;
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int32_t* SbBuffer;
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int32_t s32Blk; /* counter for block*/
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int32_t s32NumOfBlocks = pstrEncParams->s16NumOfBlocks;
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#if (SBC_JOINT_STE_INCLUDED == TRUE)
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int32_t s32MaxValue2;
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uint32_t u32CountSum, u32CountDiff;
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int32_t *pSum, *pDiff;
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#endif
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register int32_t s32NumOfSubBands = pstrEncParams->s16NumOfSubBands;
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/* SBC ananlysis filter*/
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if (s32NumOfSubBands == 4)
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SbcAnalysisFilter4(pstrEncParams, input);
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else
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SbcAnalysisFilter8(pstrEncParams, input);
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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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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)) s32MaxValue = abs32(*SbBuffer);
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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 <= (int32_t)(0x8000 << u32Count)) break;
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}
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*ps16ScfL++ = (int16_t)u32Count;
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if (u32Count > maxBit) maxBit = u32Count;
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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) s32MaxValue = abs32(*pSum);
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pSum++;
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*pDiff = (*SbBuffer - *(SbBuffer + s32NumOfSubBands)) >> 1;
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if (abs32(*pDiff) > s32MaxValue2) s32MaxValue2 = abs32(*pDiff);
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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 <= (int32_t)(0x8000 << u32Count)) break;
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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 <= (int32_t)(0x8000 << u32Count)) break;
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}
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u32CountDiff = u32Count;
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if ((*ps16ScfL + *(ps16ScfL + s32NumOfSubBands)) >
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(int16_t)(u32CountSum + u32CountDiff)) {
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if (u32CountSum > maxBit) maxBit = u32CountSum;
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if (u32CountDiff > maxBit) maxBit = u32CountDiff;
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*ps16ScfL = (int16_t)u32CountSum;
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*(ps16ScfL + s32NumOfSubBands) = (int16_t)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 = (int16_t)maxBit;
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/* bit allocation */
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if ((pstrEncParams->s16ChannelMode == SBC_STEREO) ||
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(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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/* Quantize the encoded audio */
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return EncPacking(pstrEncParams, output);
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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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uint16_t s16SamplingFreq; /*temp variable to store smpling freq*/
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int16_t s16Bitpool; /*to store bit pool value*/
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int16_t s16BitRate; /*to store bitrate*/
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int16_t s16FrameLen; /*to store frame length*/
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uint16_t HeaderParams;
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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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/* 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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if ((pstrEncParams->s16ChannelMode == SBC_JOINT_STEREO) ||
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(pstrEncParams->s16ChannelMode == SBC_STEREO)) {
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s16Bitpool =
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(int16_t)((pstrEncParams->u16BitRate * pstrEncParams->s16NumOfSubBands *
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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 +
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(4 * pstrEncParams->s16NumOfSubBands *
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pstrEncParams->s16NumOfChannels) /
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8 +
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(((pstrEncParams->s16ChannelMode - 2) *
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pstrEncParams->s16NumOfSubBands) +
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(pstrEncParams->s16NumOfBlocks * s16Bitpool)) /
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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) s16Bitpool--;
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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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} else {
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s16Bitpool = (int16_t)(
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((pstrEncParams->s16NumOfSubBands * 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 =
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(s16Bitpool > (16 * pstrEncParams->s16NumOfSubBands))
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? (16 * pstrEncParams->s16NumOfSubBands)
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: s16Bitpool;
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}
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if (pstrEncParams->s16BitPool < 0) pstrEncParams->s16BitPool = 0;
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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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} 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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SbcAnalysisInit();
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}
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