1/* ------------------------------------------------------------------ 2 * Copyright (C) 1998-2009 PacketVideo 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either 13 * express or implied. 14 * See the License for the specific language governing permissions 15 * and limitations under the License. 16 * ------------------------------------------------------------------- 17 */ 18/* 19 20 Filename: get_sbr_bitstream.c 21 22------------------------------------------------------------------------------ 23 REVISION HISTORY 24 25 26 Who: Date: MM/DD/YYYY 27 Description: 28 29------------------------------------------------------------------------------ 30 INPUT AND OUTPUT DEFINITIONS 31 32 INPUT 33 34 SBRDECODER self, 35 SBRBITSTREAM * stream, 36 float *timeData, 37 int numChannels 38 39 OUTPUT 40 41 errorCode, noError if successful 42 43------------------------------------------------------------------------------ 44 FUNCTION DESCRIPTION 45 46 sbr decoder processing, set up SBR decoder phase 2 in case of 47 different cotrol data 48 49------------------------------------------------------------------------------ 50 REQUIREMENTS 51 52 53------------------------------------------------------------------------------ 54 REFERENCES 55 56SC 29 Software Copyright Licencing Disclaimer: 57 58This software module was originally developed by 59 Coding Technologies 60 61and edited by 62 - 63 64in the course of development of the ISO/IEC 13818-7 and ISO/IEC 14496-3 65standards for reference purposes and its performance may not have been 66optimized. This software module is an implementation of one or more tools as 67specified by the ISO/IEC 13818-7 and ISO/IEC 14496-3 standards. 68ISO/IEC gives users free license to this software module or modifications 69thereof for use in products claiming conformance to audiovisual and 70image-coding related ITU Recommendations and/or ISO/IEC International 71Standards. ISO/IEC gives users the same free license to this software module or 72modifications thereof for research purposes and further ISO/IEC standardisation. 73Those intending to use this software module in products are advised that its 74use may infringe existing patents. ISO/IEC have no liability for use of this 75software module or modifications thereof. Copyright is not released for 76products that do not conform to audiovisual and image-coding related ITU 77Recommendations and/or ISO/IEC International Standards. 78The original developer retains full right to modify and use the code for its 79own purpose, assign or donate the code to a third party and to inhibit third 80parties from using the code for products that do not conform to audiovisual and 81image-coding related ITU Recommendations and/or ISO/IEC International Standards. 82This copyright notice must be included in all copies or derivative works. 83Copyright (c) ISO/IEC 2002. 84 85------------------------------------------------------------------------------ 86 PSEUDO-CODE 87 88------------------------------------------------------------------------------ 89*/ 90 91 92/*---------------------------------------------------------------------------- 93; INCLUDES 94----------------------------------------------------------------------------*/ 95#ifdef AAC_PLUS 96 97#include "get_sbr_bitstream.h" 98#include "pv_audio_type_defs.h" 99#include "sbr_crc_check.h" 100 101/*---------------------------------------------------------------------------- 102; MACROS 103; Define module specific macros here 104----------------------------------------------------------------------------*/ 105 106 107/*---------------------------------------------------------------------------- 108; DEFINES 109; Include all pre-processor statements here. Include conditional 110; compile variables also. 111----------------------------------------------------------------------------*/ 112 113/*---------------------------------------------------------------------------- 114; LOCAL FUNCTION DEFINITIONS 115; Function Prototype declaration 116----------------------------------------------------------------------------*/ 117 118/*---------------------------------------------------------------------------- 119; LOCAL STORE/BUFFER/POINTER DEFINITIONS 120; Variable declaration - defined here and used outside this module 121----------------------------------------------------------------------------*/ 122 123/*---------------------------------------------------------------------------- 124; EXTERNAL FUNCTION REFERENCES 125; Declare functions defined elsewhere and referenced in this module 126----------------------------------------------------------------------------*/ 127 128/*---------------------------------------------------------------------------- 129; EXTERNAL GLOBAL STORE/BUFFER/POINTER REFERENCES 130; Declare variables used in this module but defined elsewhere 131----------------------------------------------------------------------------*/ 132 133/*---------------------------------------------------------------------------- 134; FUNCTION CODE 135----------------------------------------------------------------------------*/ 136 137void get_sbr_bitstream(SBRBITSTREAM *sbrBitStream, BITS *pInputStream) 138{ 139 /*---------------------------------------------------------------------------- 140 ; Define all local variables 141 ----------------------------------------------------------------------------*/ 142 143 Int32 count; 144 Int32 esc_count; 145 Int32 Extention_Type; 146 Int32 i; 147 148 count = get9_n_lessbits(LEN_F_CNT, pInputStream); 149 if (count == 15) 150 { 151 esc_count = get9_n_lessbits(LEN_F_ESC, pInputStream); 152 count = esc_count + 14; 153 } 154 155 156 157 Extention_Type = get9_n_lessbits(LEN_F_CNT, pInputStream); 158 159 160 if (((Extention_Type == SBR_EXTENSION) || (Extention_Type == SBR_EXTENSION_CRC)) 161 && (count < MAXSBRBYTES) && (count) && (sbrBitStream->NrElements < MAXNRELEMENTS)) 162 { 163 164 sbrBitStream->sbrElement[sbrBitStream->NrElements].ExtensionType = Extention_Type; 165 sbrBitStream->sbrElement[sbrBitStream->NrElements].Payload = count; 166 sbrBitStream->sbrElement[sbrBitStream->NrElements].Data[0] = (UChar) get9_n_lessbits(LEN_F_CNT, pInputStream); 167 for (i = 1 ; i < count ; i++) 168 { 169 sbrBitStream->sbrElement[sbrBitStream->NrElements].Data[i] = (UChar) get9_n_lessbits(8, pInputStream); 170 } 171 172 sbrBitStream->NrElements += 1; 173 174 } 175 else 176 { 177 pInputStream->usedBits += (count - 1) * LEN_BYTE; 178 pInputStream->usedBits += 4; /* compenste for LEN_F_CNT (=4) bits read for Extention_Type */ 179 180 } 181} 182 183#endif 184