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1 /* |
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2 * Copyright (c) 2010 Ixonos Plc. |
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3 * All rights reserved. |
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4 * This component and the accompanying materials are made available |
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5 * under the terms of the "Eclipse Public License v1.0" |
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6 * which accompanies this distribution, and is available |
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7 * at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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8 * |
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9 * Initial Contributors: |
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10 * Nokia Corporation - Initial contribution |
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11 * |
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12 * Contributors: |
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13 * Ixonos Plc |
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14 * |
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15 * Description: |
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16 * |
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17 */ |
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18 |
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19 |
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20 /************************************************************************** |
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21 coupling.cpp - Coupling channel implementations (parsing only!). |
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22 |
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23 Author(s): Juha Ojanpera |
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24 Copyright (c) 2000-2004 by Nokia Research Center, Speech and Audio Systems. |
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25 *************************************************************************/ |
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26 |
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27 /*-- System Headers. --*/ |
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28 #include <math.h> |
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29 |
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30 /*-- Project Headers. --*/ |
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31 #include "tool2.h" |
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32 #include "defines.h" |
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33 |
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34 int16 |
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35 GetCCE(CAACAudDec *aac, TBitStream *bs, CMC_Info *mip, CCInfo **ccInfo) |
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36 { |
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37 TCh_Info cip; |
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38 CToolInfo *tool; |
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39 CWindowInfo *ccWin; |
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40 int16 i, j, tag, cidx, ch, nele, nch; |
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41 int16 shared[2 * ((LEN_NCC << 3) + 1)], global_gain; |
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42 |
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43 ZERO_MEMORY(&cip, sizeof(TCh_Info)); |
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44 |
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45 /*-- Get (dummy) channel index for this coupling channel. --*/ |
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46 cidx = mip->dummyCCh; |
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47 |
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48 tool = ccInfo[cidx]->tool; |
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49 ccWin = ccInfo[cidx]->winInfo; |
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50 |
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51 tag = (int16) BsGetBits(bs, LEN_TAG); |
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52 mip->cc_ind[cidx] = (int16) BsGetBits(bs, LEN_IND_SW_CCE); |
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53 |
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54 /*-- Coupled (target) elements. --*/ |
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55 ZERO_MEMORY(shared, sizeof(shared)); |
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56 nele = (int16) BsGetBits(bs, LEN_NCC); |
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57 for(i = 0, nch = 0; i < nele + 1; i++) |
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58 { |
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59 int16 cpe; |
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60 |
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61 cpe = (int16) BsGetBits(bs, LEN_IS_CPE); |
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62 tag = (int16) BsGetBits(bs, LEN_TAG); |
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63 ch = CCChIndex(mip, cpe, tag); |
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64 |
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65 if(!cpe) |
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66 shared[nch++] = 0; |
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67 else |
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68 { |
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69 int16 cc_l = (int16) BsGetBits(bs, LEN_CC_LR); |
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70 int16 cc_r = (int16) BsGetBits(bs, LEN_CC_LR); |
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71 j = (int16) ((cc_l << 1) | cc_r); |
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72 |
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73 switch(j) |
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74 { |
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75 /*-- Shared gain list. --*/ |
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76 case 0: |
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77 shared[nch] = 1; |
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78 shared[nch + 1] = 1; |
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79 nch += 2; |
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80 break; |
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81 |
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82 /*-- Left channel gain list. --*/ |
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83 case 1: |
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84 shared[nch] = 0; |
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85 nch += 1; |
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86 break; |
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87 |
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88 /*-- Right channel gain list. --*/ |
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89 case 2: |
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90 shared[nch] = 0; |
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91 nch += 1; |
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92 break; |
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93 |
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94 /*-- Two gain lists. --*/ |
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95 case 3: |
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96 shared[nch] = 0; |
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97 shared[nch + 1] = 0; |
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98 nch += 2; |
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99 break; |
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100 |
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101 default: |
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102 shared[nch] = 0; |
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103 shared[nch + 1] = 0; |
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104 break; |
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105 } |
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106 } |
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107 } |
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108 |
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109 int16 cc_dom = (int16) BsGetBits(bs, LEN_CC_DOM); |
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110 int16 cc_gain_ele_sign = (int16) BsGetBits(bs, LEN_CC_SGN); |
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111 int16 scl_idx = (int16) BsGetBits(bs, LEN_CCH_GES); |
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112 |
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113 /*-- Global gain. --*/ |
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114 global_gain = (int16) BsGetBits(bs, LEN_SCL_PCM); |
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115 |
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116 /*-- Side information. --*/ |
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117 if(!GetICSInfo(bs, ccWin, tool->ltp, NULL)) |
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118 return (-1); |
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119 |
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120 cip.info = mip->sfbInfo->winmap[ccWin->wnd]; |
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121 |
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122 /*-- Channel parameters. --*/ |
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123 if (cip.sf_huf == 0) return (-1); |
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124 if(!GetICS(bs, &cip, ccWin->group, ccWin->max_sfb, ccWin->cb_map, |
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125 tool->quant, global_gain, ccWin->sfac)) |
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126 return (-1); |
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127 |
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128 /*-- Coupling for first target channel(s) is already at correct scale. --*/ |
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129 ch = shared[0] ? (int16) 2 : (int16) 1; |
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130 |
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131 /*-- Bitstreams for target channel scale factors. --*/ |
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132 for( ; ch < nch; ch++) |
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133 { |
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134 /*-- If needed, get common gain elment present. --*/ |
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135 int16 cgep = (mip->cc_ind[cidx]) ? (int16) 1 : (int16) BsGetBits(bs, LEN_CCH_CGP); |
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136 |
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137 if(cgep) |
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138 int16 fac = (int16) (GetHcb(aac->sf_huf, bs) - MIDFAC); |
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139 |
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140 /*-- Must be dependently switched CCE. --*/ |
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141 else |
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142 if(!huf_sfac(bs, &cip, ccWin->group, ccWin->cb_map, 0, ccWin->sfac, ccWin->max_sfb)) |
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143 return (-1); |
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144 } |
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145 |
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146 return (TRUE); |
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147 } |