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_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 Huber Input 38d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber mp3ScaleFactors *scalefac, 39d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber mp3SideInfo *si, side info 40d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber int32 gr, granule 41d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber int32 ch, channel 42d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber tbits *pMainData bit stream 43d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 44d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber Returns 45d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 46d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber mp3ScaleFactors *scalefac, scale factors 47d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 48d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber------------------------------------------------------------------------------ 49d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber FUNCTION DESCRIPTION 50d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 51d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber get scale factors 52d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 53d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber------------------------------------------------------------------------------ 54d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber REQUIREMENTS 55d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 56d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 57d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber------------------------------------------------------------------------------ 58d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber REFERENCES 59d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 60d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber [1] ISO MPEG Audio Subgroup Software Simulation Group (1996) 61d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber ISO 13818-3 MPEG-2 Audio Decoder - Lower Sampling Frequency Extension 62d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 63d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber------------------------------------------------------------------------------ 64d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber PSEUDO-CODE 65d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 66d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber------------------------------------------------------------------------------ 67d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber*/ 68d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 69d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 70d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber/*---------------------------------------------------------------------------- 71d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber; INCLUDES 72d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber----------------------------------------------------------------------------*/ 73d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 74d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber#include "pvmp3_get_scale_factors.h" 75d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber#include "pvmp3_getbits.h" 76d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber#include "mp3_mem_funcs.h" 77d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 78d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber/*---------------------------------------------------------------------------- 79d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber; MACROS 80d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber; Define module specific macros here 81d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber----------------------------------------------------------------------------*/ 82d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 83d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 84d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber/*---------------------------------------------------------------------------- 85d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber; DEFINES 86d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber; Include all pre-processor statements here. Include conditional 87d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber; compile variables also. 88d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber----------------------------------------------------------------------------*/ 89d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber#define Qfmt_28(a)(int32(double(0x10000000)*a)) 90d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 91d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber/*---------------------------------------------------------------------------- 92d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber; LOCAL FUNCTION DEFINITIONS 93d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber; Function Prototype declaration 94d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber----------------------------------------------------------------------------*/ 95d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 96d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber/*---------------------------------------------------------------------------- 97d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber; LOCAL STORE/BUFFER/POINTER DEFINITIONS 98d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber; Variable declaration - defined here and used outside this module 99d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber----------------------------------------------------------------------------*/ 100d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huberconst int32 slen[2][16] = 101d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber{ 102d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber {0, 0, 0, 0, 3, 1, 1, 1, 2, 2, 2, 3, 3, 3, 4, 4}, 103d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber {0, 1, 2, 3, 0, 1, 2, 3, 1, 2, 3, 1, 2, 3, 2, 3} 104d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber}; 105d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 106d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huberconst struct 107d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber{ 108d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber int32 l[5]; 109d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber int32 s[3]; 110d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber} sfbtable = 111d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber{ 112d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber {0, 6, 11, 16, 21}, 113d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber {0, 6, 12} 114d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber}; 115d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 116d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huberconst int32 long_sfbtable[4] = { 6, 5, 5, 5}; 117d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 118d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber/*---------------------------------------------------------------------------- 119d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber; EXTERNAL FUNCTION REFERENCES 120d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber; Declare functions defined elsewhere and referenced in this module 121d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber----------------------------------------------------------------------------*/ 122d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 123d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber/*---------------------------------------------------------------------------- 124d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber; EXTERNAL GLOBAL STORE/BUFFER/POINTER REFERENCES 125d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber; Declare variables used in this module but defined elsewhere 126d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber----------------------------------------------------------------------------*/ 127d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 128d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber/*---------------------------------------------------------------------------- 129d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber; FUNCTION CODE 130d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber----------------------------------------------------------------------------*/ 131d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 132d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Hubervoid pvmp3_get_scale_factors(mp3ScaleFactors *scalefac, 133d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber mp3SideInfo *si, 134d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber int32 gr, 135d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber int32 ch, 136d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber tmp3Bits *pMainData) 137d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber{ 138d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber int32 sfb; 139d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber int32 i; 140d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber int32 window; 141d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber granuleInfo *gr_info = &(si->ch[ch].gran[gr]); 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 { /* MIXED */ 147d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber for (sfb = 0; sfb < 8; sfb++) 148d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber { 149d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber scalefac->l[sfb] = getNbits(pMainData, slen[0][gr_info->scalefac_compress]); 150d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber } 151d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 152d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber for (sfb = 3; sfb < 6; sfb++) 153d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber { 154d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber for (window = 0; window < 3; window++) 155d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber { 156d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber scalefac->s[window][sfb] = getNbits(pMainData, slen[0][gr_info->scalefac_compress]); 157d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber } 158d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber } 159d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber for (sfb = 6; sfb < 12; sfb++) 160d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber { 161d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber for (window = 0; window < 3; window++) 162d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber { 163d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber scalefac->s[window][sfb] = getNbits(pMainData, slen[1][gr_info->scalefac_compress]); 164d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber } 165d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber } 166d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber } 167d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber else 168d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber { /* SHORT*/ 169d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber for (i = 0; i < 2; i++) 170d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber { 171d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber for (sfb = sfbtable.s[i]; sfb < sfbtable.s[i+1]; sfb++) 172d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber { 173d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber for (window = 0; window < 3; window++) 174d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber { 175d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber scalefac->s[window][sfb] = getNbits(pMainData, slen[i][gr_info->scalefac_compress]); 176d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber } 177d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber } 178d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber } 179d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber } 180d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 181d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber scalefac->s[0][12] = 0; /* sfb = 12 win= 0 */ 182d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber scalefac->s[1][12] = 0; /* sfb = 12 win= 1 */ 183d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber scalefac->s[2][12] = 0; /* sfb = 12 win= 2 */ 184d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber } 185d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber else 186d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber { /* LONG types 0,1,3 */ 187d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 188d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber int32 *ptr = &scalefac->l[0]; 189d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 190d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber for (i = 0; i < 4; i++) 191d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber { 192d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber int32 tmp4 = long_sfbtable[i]; 193d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 194d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber if ((si->ch[ch].scfsi[i] == 0) || (gr == 0)) 195d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber { 196d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber int32 tmp1 = slen[(i>>1)][gr_info->scalefac_compress]; 197d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 198d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber if (tmp1) 199d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber { 200d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber int32 tmp2 = tmp1 * tmp4; 201d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber uint32 tmp3 = getNbits(pMainData, tmp2); 202d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber tmp4 = 32 - tmp1; 203d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber for (; tmp2 > 0; tmp2 -= tmp1) 204d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber { 205d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber *(ptr++) = (tmp3 << (32 - tmp2)) >> tmp4; 206d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber } 207d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber } 208d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber else 209d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber { 210d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber for (sfb = tmp4; sfb != 0; sfb--) 211d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber { 212d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber *(ptr++) = 0; 213d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber } 214d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 215d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber } 216d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber } 217d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber else 218d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber { 219d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber ptr += tmp4; 220d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber } 221d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber } 222d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber scalefac->l[21] = 0; 223d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber scalefac->l[22] = 0; 224d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber } 225d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber} 226d9618f23226f46c752e56f712bc4b505117d8b4bAndreas Huber 227