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 * Block decoding functions. |
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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 |
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22 #include "h263dConfig.h" |
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23 |
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24 #include "decblock.h" |
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25 #include "blkfunc.h" |
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26 #include "viddemux.h" |
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27 #include "idct.h" |
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28 |
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29 |
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30 /* {{-output"dblfree.txt"}} */ |
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31 /* |
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32 * dblFree |
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33 * |
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34 * |
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35 * Parameters: |
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36 * None. |
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37 * |
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38 * Function: |
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39 * This function deinitializes the module. |
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40 * Any functions of this module must not be called after dblFree (except |
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41 * for dblLoad). |
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42 * |
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43 * Returns: |
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44 * >= 0 if succeeded |
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45 * < 0 if failed |
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46 * |
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47 */ |
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48 |
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49 int dblFree(void) |
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50 /* {{-output"dblfree.txt"}} */ |
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51 { |
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52 return 0; |
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53 } |
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54 |
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55 |
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56 /* {{-output"dblload.txt"}} */ |
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57 /* |
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58 * dblLoad |
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59 * |
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60 * |
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61 * Parameters: |
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62 * None. |
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63 * |
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64 * Function: |
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65 * This function initializes the module. |
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66 * dblLoad has to be called before any other function of this module |
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67 * is used. |
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68 * |
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69 * Returns: |
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70 * >= 0 if succeeded |
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71 * < 0 if failed |
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72 * |
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73 */ |
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74 |
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75 int dblLoad(void) |
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76 /* {{-output"dblload.txt"}} */ |
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77 { |
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78 return 0; |
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79 } |
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80 |
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81 |
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82 /* {{-output"dblIdctAndDequant.txt"}} */ |
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83 /* |
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84 * dblIdctAndDequant |
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85 * |
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86 * Parameters: |
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87 * block block array (length 64) |
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88 * quant quantization information |
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89 * skip must be 1 if INTRADC is in the block, otherwise 0 |
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90 * |
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91 * Function: |
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92 * This function makes the dequantization, the clipping and the inverse |
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93 * cosine transform for the given block. |
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94 * |
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95 * Returns: |
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96 * Nothing. |
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97 * |
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98 * Error codes: |
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99 * None. |
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100 * |
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101 */ |
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102 |
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103 void dblIdctAndDequant(int *block, int quant, int skip) |
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104 /* {{-output"dblIdctAndDequant.txt"}} */ |
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105 { |
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106 |
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107 int rec, i, *tmpBlock, level; |
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108 |
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109 /* See section 6.2.1 of H.263 Recommendation for Inverse Quantization |
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110 formulas. */ |
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111 |
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112 /* If odd quantization parameter */ |
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113 if (quant & 1) { |
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114 |
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115 for (i = 64 - skip, tmpBlock = block + skip; i; i--, tmpBlock++) { |
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116 |
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117 if (!(*tmpBlock)) |
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118 continue; |
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119 |
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120 level = *tmpBlock; |
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121 |
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122 if (level > 0) { |
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123 rec = quant * ((level << 1) + 1); |
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124 *tmpBlock = (rec < 2048) ? rec : 2047; |
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125 } |
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126 |
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127 else { |
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128 rec = -(quant * (((-level) << 1) + 1)); |
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129 *tmpBlock = (rec < -2048) ? -2048 : rec; |
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130 } |
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131 } |
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132 } |
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133 |
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134 /* Else even quantization parameter */ |
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135 else { |
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136 |
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137 /* For loop copy-pasted from the previous case due to speed |
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138 optimization */ |
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139 for (i = 64 - skip, tmpBlock = block + skip; i; i--, tmpBlock++) { |
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140 |
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141 if (!(*tmpBlock)) |
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142 continue; |
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143 |
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144 level = *tmpBlock; |
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145 |
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146 if (level > 0) { |
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147 rec = quant * ((level << 1) + 1) - 1; |
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148 *tmpBlock = (rec < 2048) ? rec : 2047; |
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149 } |
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150 |
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151 else { |
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152 rec = -(quant * (((-level) << 1) + 1) - 1); |
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153 *tmpBlock = (rec < -2048) ? -2048 : rec; |
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154 } |
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155 } |
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156 } |
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157 idct(block); |
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158 } |
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159 |
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160 |
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161 /* |
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162 * dblIdct |
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163 * |
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164 * Parameters: |
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165 * block block array (length 64) |
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166 * |
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167 * Function: |
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168 * This function makes the inverse |
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169 * cosine transform for the given block. |
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170 * |
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171 * Returns: |
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172 * Nothing. |
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173 * |
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174 * Error codes: |
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175 * None. |
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176 * |
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177 */ |
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178 |
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179 void dblIdct(int *block) |
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180 |
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181 { |
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182 idct(block); |
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183 } |
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184 // End of File |
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