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