frameworks/base/media/libstagefright/codecs/aacdec/sbr_inv_filt_levelemphasis.cpp

   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_inv_filt_levelemphasis.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
  33
  34 ------------------------------------------------------------------------------
  35  FUNCTION DESCRIPTION
  36
  37
  38 ------------------------------------------------------------------------------
  39  REQUIREMENTS
  40
  41
  42 ------------------------------------------------------------------------------
  43  REFERENCES
  44
  45 SC 29 Software Copyright Licencing Disclaimer:
  46
  47 This software module was originally developed by
  48   Coding Technologies
  49
  50 and edited by
  51   -
  52
  53 in the course of development of the ISO/IEC 13818-7 and ISO/IEC 14496-3
  54 standards for reference purposes and its performance may not have been
  55 optimized. This software module is an implementation of one or more tools as
  56 specified by the ISO/IEC 13818-7 and ISO/IEC 14496-3 standards.
  57 ISO/IEC gives users free license to this software module or modifications
  58 thereof for use in products claiming conformance to audiovisual and
  59 image-coding related ITU Recommendations and/or ISO/IEC International
  60 Standards. ISO/IEC gives users the same free license to this software module or
  61 modifications thereof for research purposes and further ISO/IEC standardisation.
  62 Those intending to use this software module in products are advised that its
  63 use may infringe existing patents. ISO/IEC have no liability for use of this
  64 software module or modifications thereof. Copyright is not released for
  65 products that do not conform to audiovisual and image-coding related ITU
  66 Recommendations and/or ISO/IEC International Standards.
  67 The original developer retains full right to modify and use the code for its
  68 own purpose, assign or donate the code to a third party and to inhibit third
  69 parties from using the code for products that do not conform to audiovisual and
  70 image-coding related ITU Recommendations and/or ISO/IEC International Standards.
  71 This copyright notice must be included in all copies or derivative works.
  72 Copyright (c) ISO/IEC 2002.
  73
  74 ------------------------------------------------------------------------------
  75  PSEUDO-CODE
  76
  77 ------------------------------------------------------------------------------
  78 */
  79
  80
  81 /*----------------------------------------------------------------------------
  82 ; INCLUDES
  83 ----------------------------------------------------------------------------*/
  84
  85 #ifdef AAC_PLUS
  86
  87
  88 #include    "sbr_inv_filt_levelemphasis.h"
  89 #include    "sbr_generate_high_freq.h"
  90
  91 /*----------------------------------------------------------------------------
  92 ; MACROS
  93 ; Define module specific macros here
  94 ----------------------------------------------------------------------------*/
  95
  96
  97 /*----------------------------------------------------------------------------
  98 ; DEFINES
  99 ; Include all pre-processor statements here. Include conditional
 100 ; compile variables also.
 101 ----------------------------------------------------------------------------*/
 102
 103 /*----------------------------------------------------------------------------
 104 ; LOCAL FUNCTION DEFINITIONS
 105 ; Function Prototype declaration
 106 ----------------------------------------------------------------------------*/
 107
 108 /*----------------------------------------------------------------------------
 109 ; LOCAL STORE/BUFFER/POINTER DEFINITIONS
 110 ; Variable declaration - defined here and used outside this module
 111 ----------------------------------------------------------------------------*/
 112
 113 /*----------------------------------------------------------------------------
 114 ; EXTERNAL FUNCTION REFERENCES
 115 ; Declare functions defined elsewhere and referenced in this module
 116 ----------------------------------------------------------------------------*/
 117
 118 /*----------------------------------------------------------------------------
 119 ; EXTERNAL GLOBAL STORE/BUFFER/POINTER REFERENCES
 120 ; Declare variables used in this module but defined elsewhere
 121 ----------------------------------------------------------------------------*/
 122
 123
 124 #include "pv_audio_type_defs.h"
 125 #include "fxp_mul32.h"
 126
 127 #define R_SHIFT     29
 128 #define Qfmt(x)   (Int32)(x*((Int32)1<<R_SHIFT) + (x>=0?0.5F:-0.5F))
 129
 130 const Int32 InvFiltFactors[5] = {Qfmt(0.00f),    /* OFF_LEVEL */
 131                                  Qfmt(0.60f),     /* TRANSITION_LEVEL */
 132                                  Qfmt(0.75f),     /* LOW_LEVEL */
 133                                  Qfmt(0.90f),     /* MID_LEVEL */
 134                                  Qfmt(0.98f)
 135                                 };    /* HIGH_LEVEL */
 136
 137 /*----------------------------------------------------------------------------
 138 ; FUNCTION CODE
 139 ----------------------------------------------------------------------------*/
 140
 141 void sbr_inv_filt_levelemphasis(INVF_MODE *invFiltMode,
 142                                 INVF_MODE *prevInvFiltMode,
 143                                 Int32 nNfb,
 144                                 Int32  BwVector[MAX_NUM_PATCHES],
 145                                 Int32  BwVectorOld[MAX_NUM_PATCHES])
 146 {
 147     Int32 i;
 148     Int32 j;
 149     Int32 tmp;
 150
 151     for (i = 0; i < nNfb; i++)
 152     {
 153         switch (invFiltMode[i])
 154         {
 155             case INVF_LOW_LEVEL:
 156                 if (prevInvFiltMode[i] == INVF_OFF)
 157                 {
 158                     j = 1;
 159                 }
 160                 else
 161                 {
 162                     j = 2;
 163                 }
 164                 break;
 165
 166             case INVF_MID_LEVEL:
 167                 j = 3;
 168                 break;
 169
 170             case INVF_HIGH_LEVEL:
 171                 j = 4;
 172                 break;
 173
 174             default:
 175                 if (prevInvFiltMode[i] == INVF_LOW_LEVEL)
 176                 {
 177                     j = 1;
 178                 }
 179                 else
 180                 {
 181                     j = 0;
 182                 }
 183         }
 184
 185         tmp  =  InvFiltFactors[j];
 186
 187         if (tmp < BwVectorOld[i])
 188         {
 189             tmp = ((tmp << 1) + tmp + BwVectorOld[i]) >> 2;
 190         }
 191         else
 192         {
 193             tmp =  fxp_mul32_Q29(Qfmt(0.90625f), tmp);
 194             tmp =  fxp_mac32_Q29(Qfmt(0.09375f), BwVectorOld[i], tmp);
 195         }
 196
 197         if (tmp < Qfmt(0.015625F))
 198         {
 199             tmp = 0;
 200         }
 201
 202         if (tmp >= Qfmt(0.99609375f))
 203         {
 204             tmp = Qfmt(0.99609375f);
 205         }
 206
 207         BwVector[i] = tmp;
 208     }
 209 }
 210
 211
 212 #endif
 213
 214