arduino-esp32/tools/sdk/include/bluedroid/oi_bitstream.h

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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.
*
******************************************************************************/
#ifndef _OI_BITSTREAM_H
#define _OI_BITSTREAM_H
/**********************************************************************************
$Revision: #1 $
***********************************************************************************/
/**
@file
Function prototypes and macro definitions for manipulating input and output
bitstreams.
@ingroup codec_internal
*/
/**
@addtogroup codec_internal
@{
*/
#include "oi_codec_sbc_private.h"
#include "oi_stddefs.h"
INLINE void OI_BITSTREAM_ReadInit(OI_BITSTREAM *bs, const OI_BYTE *buffer);
INLINE void OI_BITSTREAM_WriteInit(OI_BITSTREAM *bs, OI_BYTE *buffer);
INLINE OI_UINT32 OI_BITSTREAM_ReadUINT(OI_BITSTREAM *bs, OI_UINT bits);
INLINE OI_UINT8 OI_BITSTREAM_ReadUINT4Aligned(OI_BITSTREAM *bs);
INLINE OI_UINT8 OI_BITSTREAM_ReadUINT8Aligned(OI_BITSTREAM *bs);
INLINE void OI_BITSTREAM_WriteUINT(OI_BITSTREAM *bs,
OI_UINT16 value,
OI_UINT bits);
/*
* Use knowledge that the bitstream is aligned to optimize the write of a byte
*/
PRIVATE void OI_BITSTREAM_WriteUINT8Aligned(OI_BITSTREAM *bs,
OI_UINT8 datum);
/*
* Use knowledge that the bitstream is aligned to optimize the write pair of nibbles
*/
PRIVATE void OI_BITSTREAM_Write2xUINT4Aligned(OI_BITSTREAM *bs,
OI_UINT8 datum1,
OI_UINT8 datum2);
/** Internally the bitstream looks ahead in the stream. When
* OI_SBC_ReadScalefactors() goes to temporarily break the abstraction, it will
* need to know where the "logical" pointer is in the stream.
*/
#define OI_BITSTREAM_GetWritePtr(bs) ((bs)->ptr.w - 3)
#define OI_BITSTREAM_GetReadPtr(bs) ((bs)->ptr.r - 3)
/** This is declared here as a macro because decoder.c breaks the bitsream
* encapsulation for efficiency reasons.
*/
#define OI_BITSTREAM_READUINT(result, bits, ptr, value, bitPtr) \
do { \
OI_ASSERT((bits) <= 16); \
OI_ASSERT((bitPtr) < 16); \
OI_ASSERT((bitPtr) >= 8); \
\
result = (value) << (bitPtr); \
result >>= 32 - (bits); \
\
bitPtr += (bits); \
while (bitPtr >= 16) { \
value = ((value) << 8) | *ptr++; \
bitPtr -= 8; \
} \
OI_ASSERT((bits == 0) || (result < (1u << (bits)))); \
} while (0)
#define OI_BITSTREAM_WRITEUINT(ptr, value, bitPtr, datum, bits) \
do {\
bitPtr -= bits;\
value |= datum << bitPtr;\
\
while (bitPtr <= 16) {\
bitPtr += 8;\
*ptr++ = (OI_UINT8)(value >> 24);\
value <<= 8;\
}\
} while (0)
#define OI_BITSTREAM_WRITEFLUSH(ptr, value, bitPtr) \
do {\
while (bitPtr < 32) {\
bitPtr += 8;\
*ptr++ = (OI_UINT8)(value >> 24);\
value <<= 8;\
}\
} while (0)
/**
@}
*/
#endif /* _OI_BITSTREAM_H */