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: sbr_get_noise_floor_data.c 21 22 23 ------------------------------------------------------------------------------ 24 REVISION HISTORY 25 26 27 Who: Date: MM/DD/YYYY 28 Description: 29 30 ------------------------------------------------------------------------------ 31 INPUT AND OUTPUT DEFINITIONS 32 33 Arguments: h_frame_data - handle to struct SBR_FRAME_DATA 34 hBitBuf - handle to struct BIT_BUF 35 36 Return: void 37 38 39 ------------------------------------------------------------------------------ 40 FUNCTION DESCRIPTION 41 42 Reads noise-floor-level data from bitstream 43 44 ------------------------------------------------------------------------------ 45 REQUIREMENTS 46 47 48 ------------------------------------------------------------------------------ 49 REFERENCES 50 51 SC 29 Software Copyright Licencing Disclaimer: 52 53 This software module was originally developed by 54 Coding Technologies 55 56 and edited by 57 - 58 59 in the course of development of the ISO/IEC 13818-7 and ISO/IEC 14496-3 60 standards for reference purposes and its performance may not have been 61 optimized. This software module is an implementation of one or more tools as 62 specified by the ISO/IEC 13818-7 and ISO/IEC 14496-3 standards. 63 ISO/IEC gives users free license to this software module or modifications 64 thereof for use in products claiming conformance to audiovisual and 65 image-coding related ITU Recommendations and/or ISO/IEC International 66 Standards. ISO/IEC gives users the same free license to this software module or 67 modifications thereof for research purposes and further ISO/IEC standardisation. 68 Those intending to use this software module in products are advised that its 69 use may infringe existing patents. ISO/IEC have no liability for use of this 70 software module or modifications thereof. Copyright is not released for 71 products that do not conform to audiovisual and image-coding related ITU 72 Recommendations and/or ISO/IEC International Standards. 73 The original developer retains full right to modify and use the code for its 74 own purpose, assign or donate the code to a third party and to inhibit third 75 parties from using the code for products that do not conform to audiovisual and 76 image-coding related ITU Recommendations and/or ISO/IEC International Standards. 77 This copyright notice must be included in all copies or derivative works. 78 Copyright (c) ISO/IEC 2002. 79 80 ------------------------------------------------------------------------------ 81 PSEUDO-CODE 82 83 ------------------------------------------------------------------------------ 84 */ 85 86 87 /*---------------------------------------------------------------------------- 88 ; INCLUDES 89 ----------------------------------------------------------------------------*/ 90 91 #ifdef AAC_PLUS 92 93 94 #include "sbr_get_noise_floor_data.h" 95 #include "e_coupling_mode.h" 96 #include "buf_getbits.h" 97 #include "sbr_code_book_envlevel.h" 98 #include "s_huffman.h" 99 #include "sbr_decode_huff_cw.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 ----------------------------------------------------------------------------*/ 136 137 void sbr_get_noise_floor_data(SBR_FRAME_DATA * h_frame_data, 138 BIT_BUFFER * hBitBuf) 139 { 140 Int32 i; 141 Int32 j; 142 Int32 k; 143 Int32 tmp; 144 Int32 delta; 145 Int32 noNoiseBands = h_frame_data->nNfb; 146 Int32 envDataTableCompFactor; 147 148 COUPLING_MODE coupling = h_frame_data->coupling; 149 150 SbrHuffman hcb_noiseF; 151 SbrHuffman hcb_noise; 152 153 154 if (coupling == COUPLING_BAL) 155 { 156 hcb_noise = bookSbrNoiseBalance11T; 157 hcb_noiseF = bookSbrEnvBalance11F; /* "bookSbrNoiseBalance11F" */ 158 envDataTableCompFactor = 1; 159 } 160 else 161 { 162 hcb_noise = bookSbrNoiseLevel11T; 163 hcb_noiseF = bookSbrEnvLevel11F; /* "bookSbrNoiseLevel11F" */ 164 envDataTableCompFactor = 0; 165 } 166 167 /* 168 * Calculate number of values alltogether 169 */ 170 h_frame_data->nNoiseFactors = h_frame_data->frameInfo[((h_frame_data->frameInfo[0]) << 1) + 3] * noNoiseBands; 171 172 173 for (i = 0; i < h_frame_data->nNoiseFloorEnvelopes; i++) 174 { 175 k = i * noNoiseBands; 176 if (h_frame_data->domain_vec2[i] == FREQ) 177 { 178 if (coupling == COUPLING_BAL) 179 { 180 tmp = buf_getbits(hBitBuf, SI_SBR_START_NOISE_BITS_BALANCE_AMP_RES_3_0) << 1; /* max. 62 */ 181 h_frame_data->sbrNoiseFloorLevel_man[k] = tmp; 182 h_frame_data->sbrNoiseFloorLevel_exp[k] = 0; 183 } 184 else 185 { 186 tmp = buf_getbits(hBitBuf, SI_SBR_START_NOISE_BITS_AMP_RES_3_0); /* max. 31 */ 187 h_frame_data->sbrNoiseFloorLevel_man[k] = tmp; 188 h_frame_data->sbrNoiseFloorLevel_exp[k] = 0; 189 } 190 191 for (j = 1; j < noNoiseBands; j++) 192 { 193 delta = sbr_decode_huff_cw(hcb_noiseF, hBitBuf); /* 194 * -31 < delta < 31 195 * -24 < delta < 24 COUPLING_BAL (incl. <<1) 196 */ 197 h_frame_data->sbrNoiseFloorLevel_man[k+j] = delta << envDataTableCompFactor; 198 h_frame_data->sbrNoiseFloorLevel_exp[k+j] = 0; 199 } 200 } 201 else 202 { 203 for (j = 0; j < noNoiseBands; j++) 204 { 205 delta = sbr_decode_huff_cw(hcb_noise, hBitBuf); /* 206 * -31 < delta < 31 207 * -24 < delta < 24 COUPLING_BAL (incl. <<1) 208 */ 209 h_frame_data->sbrNoiseFloorLevel_man[k+j] = delta << envDataTableCompFactor; 210 h_frame_data->sbrNoiseFloorLevel_exp[k+j] = 0; 211 } 212 } 213 } 214 } 215 216 #endif 217 218 219
