1d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber/* ------------------------------------------------------------------ 2d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber * Copyright (C) 1998-2009 PacketVideo 3d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber * 4d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber * Licensed under the Apache License, Version 2.0 (the "License"); 5d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber * you may not use this file except in compliance with the License. 6d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber * You may obtain a copy of the License at 7d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber * 8d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber * http://www.apache.org/licenses/LICENSE-2.0 9d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber * 10d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber * Unless required by applicable law or agreed to in writing, software 11d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber * distributed under the License is distributed on an "AS IS" BASIS, 12d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either 13d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber * express or implied. 14d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber * See the License for the specific language governing permissions 15d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber * and limitations under the License. 16d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber * ------------------------------------------------------------------- 17d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber */ 18d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber/* 19d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber------------------------------------------------------------------------------ 20d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 21d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber PacketVideo Corp. 22d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber MP3 Decoder Library 23d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 24d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber Filename: pvmp3_mpeg2_get_scale_factors.cpp 25d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 26d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber Date: 09/21/2007 27d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 28d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber------------------------------------------------------------------------------ 29d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber REVISION HISTORY 30d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 31d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 32d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber Description: 33d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 34d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber------------------------------------------------------------------------------ 35d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber INPUT AND OUTPUT DEFINITIONS 36d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 37d9618f23226f46c752e56f712bc4b505117d8b4bAndreas HuberInput 38d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 39d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber mp3ScaleFactors *scalefac, 40d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber mp3SideInfo *si, side information 41d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber int32 gr, granule 42d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber int32 ch, channel 43d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber mp3Header *info, mp3 header information 44d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber uint32 *scalefac_IIP_buffer, auxiliary scale data 45d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber tbits *pMainData bit stream Data 46d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 47d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber Returns 48d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 49d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber III_scalefac_t *scalefac, scale factor 50d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 51d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 52d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber------------------------------------------------------------------------------ 53d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber FUNCTION DESCRIPTION 54d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 55d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber get scale factor for mpe2 layer III LSF extension 56d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 57d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber------------------------------------------------------------------------------ 58d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber REQUIREMENTS 59d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 60d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 61d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber------------------------------------------------------------------------------ 62d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber REFERENCES 63d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 64d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber [1] ISO MPEG Audio Subgroup Software Simulation Group (1996) 65d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber ISO 13818-3 MPEG-2 Audio Decoder - Lower Sampling Frequency Extension 66d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 67d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber------------------------------------------------------------------------------ 68d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber PSEUDO-CODE 69d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 70d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber------------------------------------------------------------------------------ 71d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber*/ 72d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 73d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 74d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber/*---------------------------------------------------------------------------- 75d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber; INCLUDES 76d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber----------------------------------------------------------------------------*/ 77d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 78d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber#include "pvmp3_mpeg2_get_scale_factors.h" 79d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber#include "pvmp3_mpeg2_get_scale_data.h" 80d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 81d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 82d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber/*---------------------------------------------------------------------------- 83d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber; MACROS 84d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber; Define module specific macros here 85d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber----------------------------------------------------------------------------*/ 86d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 87d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 88d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber/*---------------------------------------------------------------------------- 89d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber; DEFINES 90d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber; Include all pre-processor statements here. Include conditional 91d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber; compile variables also. 92d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber----------------------------------------------------------------------------*/ 93d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 94d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber/*---------------------------------------------------------------------------- 95d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber; LOCAL FUNCTION DEFINITIONS 96d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber; Function Prototype declaration 97d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber----------------------------------------------------------------------------*/ 98d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 99d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber/*---------------------------------------------------------------------------- 100d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber; LOCAL STORE/BUFFER/POINTER DEFINITIONS 101d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber; Variable declaration - defined here and used outside this module 102d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber----------------------------------------------------------------------------*/ 103d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 104d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber/*---------------------------------------------------------------------------- 105d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber; EXTERNAL FUNCTION REFERENCES 106d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber; Declare functions defined elsewhere and referenced in this module 107d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber----------------------------------------------------------------------------*/ 108d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 109d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber/*---------------------------------------------------------------------------- 110d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber; EXTERNAL GLOBAL STORE/BUFFER/POINTER REFERENCES 111d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber; Declare variables used in this module but defined elsewhere 112d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber----------------------------------------------------------------------------*/ 113d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 114d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber/*---------------------------------------------------------------------------- 115d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber; FUNCTION CODE 116d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber----------------------------------------------------------------------------*/ 117d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 118d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Hubervoid pvmp3_mpeg2_get_scale_factors(mp3ScaleFactors *scalefac, 119d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber mp3SideInfo *si, 120d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber int32 gr, 121d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber int32 ch, 122d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber mp3Header *info, 123d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber uint32 *scalefac_IIP_buffer, 124d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber tmp3Bits *pMainData) 125d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber{ 126d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 127d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber int32 sfb; 128d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber int32 k = 0; 129d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber int32 window; 130d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber uint32 *scalefac_buffer = &scalefac_IIP_buffer[56]; 131d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 132d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber granuleInfo *gr_info = &(si->ch[ch].gran[gr]); 133d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 134d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber pvmp3_mpeg2_get_scale_data(si, 135d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber gr, 136d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber ch, 137d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber info, 138d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber (uint32 *)scalefac_buffer, 139d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber (uint32 *)scalefac_IIP_buffer, 140d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber pMainData); 141d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 142d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 143d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber if (gr_info->window_switching_flag && (gr_info->block_type == 2)) 144d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber { 145d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber if (gr_info->mixed_block_flag) 146d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber { 147d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber for (sfb = 0; sfb < 6; sfb++) 148d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber { 149d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber scalefac->l[sfb] = scalefac_buffer[sfb]; 150d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber } 151d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 152d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 153d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber k = 6; 154d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber for (sfb = 3; sfb < 12; sfb++) 155d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber { 156d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber for (window = 0; window < 3; window++) 157d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber { 158d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber scalefac->s[window][sfb] = scalefac_buffer[k]; 159d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber k++; 160d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber } 161d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber } 162d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 163d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 164d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber /* adjust position of "illegal position" information in scalefac_IIP_buffer[] */ 165d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber /* in mixed blocks mode for short sfb, move them 3 places up. efs 3002-07-04 */ 166d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber for (sfb = 11; sfb >= 3; sfb--) 167d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber { 168d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber scalefac_IIP_buffer[3*sfb + 2] = scalefac_IIP_buffer[3*sfb - 1]; 169d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber scalefac_IIP_buffer[3*sfb + 1] = scalefac_IIP_buffer[3*sfb - 2]; 170d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber scalefac_IIP_buffer[3*sfb ] = scalefac_IIP_buffer[3*sfb - 3]; 171d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 172d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber } 173d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber } 174d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber else 175d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber { /* SHORT*/ 176d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber for (sfb = 0; sfb < 12; sfb++) 177d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber { 178d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber for (window = 0; window < 3; window++) 179d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber { 180d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber scalefac->s[window][sfb] = scalefac_buffer[k]; 181d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber k++; 182d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber } 183d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber } 184d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber } 185d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 186d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber scalefac->s[0][12] = 0; 187d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber scalefac->s[1][12] = 0; 188d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber scalefac->s[2][12] = 0; 189d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 190d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber } 191d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber else 192d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber { /* LONG types 0,1,3 */ 193d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber for (sfb = 0; sfb < 21; sfb++) 194d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber { 195d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber scalefac->l[sfb] = scalefac_buffer[sfb]; 196d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber } 197d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber scalefac->l[21] = 0; 198d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber scalefac->l[22] = 0; 199d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 200d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber } 201d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber} 202d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 203