mirror of
https://github.com/espressif/esp-idf.git
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96 lines
2.5 KiB
C
96 lines
2.5 KiB
C
/******************************************************************************
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*
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* Copyright (C) 2014 The Android Open Source Project
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* Copyright 2003 - 2004 Open Interface North America, Inc. All rights 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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/**********************************************************************************
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$Revision: #1 $
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***********************************************************************************/
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/**
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@file
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Functions for manipulating input 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 "common/bt_target.h"
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#include "oi_stddefs.h"
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#include "oi_bitstream.h"
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#include "oi_assert.h"
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#if (defined(SBC_DEC_INCLUDED) && SBC_DEC_INCLUDED == TRUE)
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PRIVATE void OI_BITSTREAM_ReadInit(OI_BITSTREAM *bs,
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const OI_BYTE *buffer)
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{
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bs->value = ((OI_INT32)buffer[0] << 16) | ((OI_INT32)buffer[1] << 8) | (buffer[2]);
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bs->ptr.r = buffer + 3;
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bs->bitPtr = 8;
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}
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PRIVATE OI_UINT32 OI_BITSTREAM_ReadUINT(OI_BITSTREAM *bs, OI_UINT bits)
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{
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OI_UINT32 result;
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OI_BITSTREAM_READUINT(result, bits, bs->ptr.r, bs->value, bs->bitPtr);
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return result;
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}
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PRIVATE OI_UINT8 OI_BITSTREAM_ReadUINT4Aligned(OI_BITSTREAM *bs)
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{
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OI_UINT32 result;
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OI_ASSERT(bs->bitPtr < 16);
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OI_ASSERT(bs->bitPtr % 4 == 0);
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if (bs->bitPtr == 8) {
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result = bs->value << 8;
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bs->bitPtr = 12;
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} else {
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result = bs->value << 12;
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bs->value = (bs->value << 8) | *bs->ptr.r++;
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bs->bitPtr = 8;
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}
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result >>= 28;
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OI_ASSERT(result < (1u << 4));
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return (OI_UINT8)result;
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}
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PRIVATE OI_UINT8 OI_BITSTREAM_ReadUINT8Aligned(OI_BITSTREAM *bs)
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{
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OI_UINT32 result;
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OI_ASSERT(bs->bitPtr == 8);
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result = bs->value >> 16;
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bs->value = (bs->value << 8) | *bs->ptr.r++;
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return (OI_UINT8)result;
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}
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/**
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@}
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*/
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#endif /* #if (defined(SBC_DEC_INCLUDED) && SBC_DEC_INCLUDED == TRUE) */
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