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components/bt/host/bluedroid/external/sbc/decoder/srce/bitalloc-sbc.c
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/******************************************************************************
*
* Copyright (C) 2014 The Android Open Source Project
* Copyright 2003 - 2004 Open Interface North America, Inc. All rights reserved.
*
* 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.
*
******************************************************************************/
/**********************************************************************************
$Revision: #1 $
***********************************************************************************/
/** @file
@ingroup codec_internal
*/
/**@addgroup codec_internal*/
/**@{*/
#include "common/bt_target.h"
#include <oi_codec_sbc_private.h>
#if (defined(SBC_DEC_INCLUDED) && SBC_DEC_INCLUDED == TRUE)
static void dualBitAllocation(OI_CODEC_SBC_COMMON_CONTEXT *common)
{
OI_UINT bitcountL;
OI_UINT bitcountR;
OI_UINT bitpoolPreferenceL = 0;
OI_UINT bitpoolPreferenceR = 0;
BITNEED_UNION1 bitneedsL;
BITNEED_UNION1 bitneedsR;
bitcountL = computeBitneed(common, bitneedsL.uint8, 0, &bitpoolPreferenceL);
bitcountR = computeBitneed(common, bitneedsR.uint8, 1, &bitpoolPreferenceR);
oneChannelBitAllocation(common, &bitneedsL, 0, bitcountL);
oneChannelBitAllocation(common, &bitneedsR, 1, bitcountR);
}
static void stereoBitAllocation(OI_CODEC_SBC_COMMON_CONTEXT *common)
{
const OI_UINT nrof_subbands = common->frameInfo.nrof_subbands;
BITNEED_UNION2 bitneeds;
OI_UINT excess;
OI_INT bitadjust;
OI_UINT bitcount;
OI_UINT sbL;
OI_UINT sbR;
OI_UINT bitpoolPreference = 0;
bitcount = computeBitneed(common, &bitneeds.uint8[0], 0, &bitpoolPreference);
bitcount += computeBitneed(common, &bitneeds.uint8[nrof_subbands], 1, &bitpoolPreference);
{
OI_UINT ex;
bitadjust = adjustToFitBitpool(common->frameInfo.bitpool, bitneeds.uint32, 2 * nrof_subbands, bitcount, &ex);
/* We want the compiler to put excess into a register */
excess = ex;
}
sbL = 0;
sbR = nrof_subbands;
while (sbL < nrof_subbands) {
excess = allocAdjustedBits(&common->bits.uint8[sbL], bitneeds.uint8[sbL] + bitadjust, excess);
++sbL;
excess = allocAdjustedBits(&common->bits.uint8[sbR], bitneeds.uint8[sbR] + bitadjust, excess);
++sbR;
}
sbL = 0;
sbR = nrof_subbands;
while (excess) {
excess = allocExcessBits(&common->bits.uint8[sbL], excess);
++sbL;
if (!excess) {
break;
}
excess = allocExcessBits(&common->bits.uint8[sbR], excess);
++sbR;
}
}
static const BIT_ALLOC balloc[] = {
monoBitAllocation, /* SBC_MONO */
dualBitAllocation, /* SBC_DUAL_CHANNEL */
stereoBitAllocation, /* SBC_STEREO */
stereoBitAllocation /* SBC_JOINT_STEREO */
};
PRIVATE void OI_SBC_ComputeBitAllocation(OI_CODEC_SBC_COMMON_CONTEXT *common)
{
OI_ASSERT(common->frameInfo.bitpool <= OI_SBC_MaxBitpool(&common->frameInfo));
OI_ASSERT(common->frameInfo.mode < OI_ARRAYSIZE(balloc));
/*
* Using an array of function pointers prevents the compiler from creating a suboptimal
* monolithic inlined bit allocation function.
*/
balloc[common->frameInfo.mode](common);
}
OI_UINT32 OI_CODEC_SBC_CalculateBitrate(OI_CODEC_SBC_FRAME_INFO *frame)
{
return internal_CalculateBitrate(frame);
}
/*
* Return the current maximum bitneed and clear it.
*/
OI_UINT8 OI_CODEC_SBC_GetMaxBitneed(OI_CODEC_SBC_COMMON_CONTEXT *common)
{
OI_UINT8 max = common->maxBitneed;
common->maxBitneed = 0;
return max;
}
/*
* Calculates the bitpool size for a given frame length
*/
OI_UINT16 OI_CODEC_SBC_CalculateBitpool(OI_CODEC_SBC_FRAME_INFO *frame,
OI_UINT16 frameLen)
{
OI_UINT16 nrof_subbands = frame->nrof_subbands;
OI_UINT16 nrof_blocks = frame->nrof_blocks;
OI_UINT16 hdr;
OI_UINT16 bits;
if (frame->mode == SBC_JOINT_STEREO) {
hdr = 9 * nrof_subbands;
} else {
if (frame->mode == SBC_MONO) {
hdr = 4 * nrof_subbands;
} else {
hdr = 8 * nrof_subbands;
}
if (frame->mode == SBC_DUAL_CHANNEL) {
nrof_blocks *= 2;
}
}
bits = 8 * (frameLen - SBC_HEADER_LEN) - hdr;
return DIVIDE(bits, nrof_blocks);
}
OI_UINT16 OI_CODEC_SBC_CalculatePcmBytes(OI_CODEC_SBC_COMMON_CONTEXT *common)
{
return sizeof(OI_INT16) * common->pcmStride * common->frameInfo.nrof_subbands * common->frameInfo.nrof_blocks;
}
OI_UINT16 OI_CODEC_SBC_CalculateFramelen(OI_CODEC_SBC_FRAME_INFO *frame)
{
return internal_CalculateFramelen(frame);
}
/**@}*/
#endif /* #if (defined(SBC_DEC_INCLUDED) && SBC_DEC_INCLUDED == TRUE) */
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