esp-idf/components/bt/bluedroid/external/sbc/decoder/srce/readsamplesjoint.inc

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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.
*
******************************************************************************/
/*******************************************************************************
* @file readsamplesjoint.inc
*
* This is the body of the generic version of OI_SBC_ReadSamplesJoint().
* It is designed to be \#included into a function as follows:
\code
void OI_SBC_ReadSamplesJoint4(OI_CODEC_SBC_COMMON_CONTEXT *common, OI_BITSTREAM *global_bs)
{
#define NROF_SUBBANDS 4
#include "readsamplesjoint.inc"
#undef NROF_SUBBANDS
}
void OI_SBC_ReadSamplesJoint8(OI_CODEC_SBC_COMMON_CONTEXT *common, OI_BITSTREAM *global_bs)
{
#define NROF_SUBBANDS 8
#include "readsamplesjoint.inc"
#undef NROF_SUBBANDS
}
\endcode
* Or to make a generic version:
\code
void OI_SBC_ReadSamplesJoint(OI_CODEC_SBC_COMMON_CONTEXT *common, OI_BITSTREAM *global_bs)
{
OI_UINT nrof_subbands = common->frameInfo.nrof_subbands;
#define NROF_SUBBANDS nrof_subbands
#include "readsamplesjoint.inc"
#undef NROF_SUBBANDS
}
\endcode
* @ingroup codec_internal
*******************************************************************************/
/**********************************************************************************
$Revision: #1 $
***********************************************************************************/
{
OI_CODEC_SBC_COMMON_CONTEXT *common = &context->common;
OI_UINT bl = common->frameInfo.nrof_blocks;
OI_INT32 * RESTRICT s = common->subdata;
OI_UINT8 *ptr = global_bs->ptr.w;
OI_UINT32 value = global_bs->value;
OI_UINT bitPtr = global_bs->bitPtr;
OI_UINT8 jmask = common->frameInfo.join << (8 - NROF_SUBBANDS);
do {
OI_INT8 *sf_array = &common->scale_factor[0];
OI_UINT8 *bits_array = &common->bits.uint8[0];
OI_UINT8 joint = jmask;
OI_UINT sb;
/*
* Left channel
*/
sb = NROF_SUBBANDS;
do {
OI_UINT32 raw;
OI_INT32 dequant;
OI_UINT8 bits = *bits_array++;
OI_INT sf = *sf_array++;
OI_BITSTREAM_READUINT(raw, bits, ptr, value, bitPtr);
dequant = OI_SBC_Dequant(raw, sf, bits);
*s++ = dequant;
} while (--sb);
/*
* Right channel
*/
sb = NROF_SUBBANDS;
do {
OI_UINT32 raw;
OI_INT32 dequant;
OI_UINT8 bits = *bits_array++;
OI_INT sf = *sf_array++;
OI_BITSTREAM_READUINT(raw, bits, ptr, value, bitPtr);
dequant = OI_SBC_Dequant(raw, sf, bits);
/*
* Check if we need to do mid/side
*/
if (joint & 0x80) {
OI_INT32 mid = *(s - NROF_SUBBANDS);
OI_INT32 side = dequant;
*(s - NROF_SUBBANDS) = mid + side;
dequant = mid - side;
}
joint <<= 1;
*s++ = dequant;
} while (--sb);
} while (--bl);
}