/******************************************************************************
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*
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* Copyright 2014 The Android Open Source Project
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* Copyright 2003 - 2004 Open Interface North America, Inc. All rights
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* reserved.
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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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#ifndef _OI_BITSTREAM_H
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#define _OI_BITSTREAM_H
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/*******************************************************************************
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$Revision: #1 $
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******************************************************************************/
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/**
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@file
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Function prototypes and macro definitions for manipulating input and output
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bitstreams.
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@ingroup codec_internal
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*/
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/**
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@addtogroup codec_internal
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@{
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*/
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#include "oi_codec_sbc_private.h"
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#include "oi_stddefs.h"
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INLINE void OI_BITSTREAM_ReadInit(OI_BITSTREAM* bs, const OI_BYTE* buffer);
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INLINE void OI_BITSTREAM_WriteInit(OI_BITSTREAM* bs, OI_BYTE* buffer);
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INLINE uint32_t OI_BITSTREAM_ReadUINT(OI_BITSTREAM* bs, OI_UINT bits);
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INLINE uint8_t OI_BITSTREAM_ReadUINT4Aligned(OI_BITSTREAM* bs);
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INLINE uint8_t OI_BITSTREAM_ReadUINT8Aligned(OI_BITSTREAM* bs);
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INLINE void OI_BITSTREAM_WriteUINT(OI_BITSTREAM* bs, uint16_t value,
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OI_UINT bits);
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/*
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* Use knowledge that the bitstream is aligned to optimize the write of a byte
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*/
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PRIVATE void OI_BITSTREAM_WriteUINT8Aligned(OI_BITSTREAM* bs, uint8_t datum);
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/*
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* Use knowledge that the bitstream is aligned to optimize the writing of a
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* pair of nibbles.
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*/
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PRIVATE void OI_BITSTREAM_Write2xUINT4Aligned(OI_BITSTREAM* bs, uint8_t datum1,
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uint8_t datum2);
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/** Internally the bitstream looks ahead in the stream. When
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* OI_SBC_ReadScalefactors() goes to temporarily break the abstraction, it will
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* need to know where the "logical" pointer is in the stream.
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*/
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#define OI_BITSTREAM_GetWritePtr(bs) ((bs)->ptr.w - 3)
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#define OI_BITSTREAM_GetReadPtr(bs) ((bs)->ptr.r - 3)
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/** This is declared here as a macro because decoder.c breaks the bitsream
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* encapsulation for efficiency reasons.
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*/
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#define OI_BITSTREAM_READUINT(result, bits, ptr, value, bitPtr) \
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do { \
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OI_ASSERT((bits) <= 16); \
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OI_ASSERT((bitPtr) < 16); \
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OI_ASSERT((bitPtr) >= 8); \
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\
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(result) = (value) << (bitPtr); \
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(result) >>= 32 - (bits); \
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\
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(bitPtr) += (bits); \
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while ((bitPtr) >= 16) { \
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(value) = ((value) << 8) | *(ptr)++; \
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(bitPtr) -= 8; \
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} \
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OI_ASSERT(((bits) == 0) || ((result) < (1u << (bits)))); \
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} while (0)
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#define OI_BITSTREAM_WRITEUINT(ptr, value, bitPtr, datum, bits) \
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do { \
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(bitPtr) -= (bits); \
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(value) |= (datum) << (bitPtr); \
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\
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while ((bitPtr) <= 16) { \
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(bitPtr) += 8; \
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*(ptr)++ = (uint8_t)((value) >> 24); \
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(value) <<= 8; \
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} \
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} while (0)
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#define OI_BITSTREAM_WRITEFLUSH(ptr, value, bitPtr) \
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do { \
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while ((bitPtr) < 32) { \
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(bitPtr) += 8; \
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*(ptr)++ = (uint8_t)((value) >> 24); \
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(value) <<= 8; \
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} \
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} while (0)
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/**
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@}
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*/
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#endif /* _OI_BITSTREAM_H */
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