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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 #include "globals.h" |
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21 #include "bitbuffer.h" |
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22 #include "macroblock.h" |
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23 #include "motcomp.h" |
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24 #include "framebuffer.h" |
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25 #include "vld.h" |
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26 #include "parameterset.h" |
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27 |
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28 #ifdef USE_CLIPBUF |
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29 #include "clipbuf.h" |
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30 #endif |
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31 |
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32 /* |
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33 * Static functions |
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34 */ |
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35 |
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36 static int getMacroblock(macroblock_s *mb, int numRefFrames, |
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37 int8 *ipTab, int8 **numCoefUpPred, int diffVecs[][2], |
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38 int picType, int chromaQpIdx, bitbuffer_s *bitbuf); |
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39 |
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40 static int getMbAvailability(macroblock_s *mb, mbAttributes_s *mbData, |
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41 int picWidth, int constrainedIntra); |
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42 |
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43 |
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44 #ifdef USE_CLIPBUF |
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45 const u_int8 *mcpGetClip8Buf() |
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46 { |
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47 return clip8Buf; |
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48 } |
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49 #endif |
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50 |
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51 /* |
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52 * |
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53 * getMacroblock: |
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54 * |
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55 * Parameters: |
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56 * mb Macroblock parameters |
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57 * multRef 1 -> multiple reference frames used |
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58 * ipTab Macroblock intra pred. modes |
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59 * numCoefUpPred Block coefficient counts of upper MBs |
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60 * diffVecs Macroblock delta motion vectors |
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61 * picType Picture type (intra/inter) |
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62 * chromaQpIdx Chroma QP index relative to luma QP |
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63 * bitbuf Bitbuffer handle |
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64 * |
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65 * Function: |
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66 * Get macroblock parameters from bitbuffer |
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67 * |
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68 * Returns: |
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69 * MBK_OK for no error, MBK_ERROR for error |
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70 * |
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71 */ |
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72 static int getMacroblock(macroblock_s *mb, int numRefFrames, |
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73 int8 *ipTab, int8 **numCoefUpPred, int diffVecs[][2], |
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74 int picType, int chromaQpIdx, bitbuffer_s *bitbuf) |
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75 { |
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76 vldMBtype_s hdr; |
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77 int numVecs; |
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78 int delta_qp; |
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79 int i; |
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80 int8 *numCoefPtrY, *numCoefPtrU, *numCoefPtrV; |
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81 int retCode; |
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82 |
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83 |
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84 numCoefPtrY = &numCoefUpPred[0][mb->blkX]; |
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85 numCoefPtrU = &numCoefUpPred[1][mb->blkX>>1]; |
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86 numCoefPtrV = &numCoefUpPred[2][mb->blkX>>1]; |
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87 |
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88 /* |
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89 * Get Macroblock type |
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90 */ |
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91 |
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92 /* Check if we have to fetch run indicator */ |
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93 if (IS_SLICE_P(picType) && mb->numSkipped < 0) { |
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94 |
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95 mb->numSkipped = vldGetRunIndicator(bitbuf); |
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96 |
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97 if (bibGetStatus(bitbuf) < 0) |
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98 return MBK_ERROR; |
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99 } |
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100 |
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101 if (IS_SLICE_P(picType) && mb->numSkipped > 0) { |
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102 |
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103 /* If skipped MBs, set MB to COPY */ |
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104 mb->type = MBK_INTER; |
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105 mb->interMode = MOT_COPY; |
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106 mb->refNum[0] = 0; |
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107 mb->cbpY = mb->cbpChromaDC = mb->cbpC = 0; |
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108 mb->numSkipped -= 1; |
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109 |
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110 vldGetZeroLumaCoeffs(numCoefPtrY, mb->numCoefLeftPred); |
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111 vldGetZeroChromaCoeffs(numCoefPtrU, numCoefPtrV, mb->numCoefLeftPredC); |
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112 |
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113 return MBK_OK; |
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114 } |
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115 else { |
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116 |
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117 if (vldGetMBtype(bitbuf, &hdr, picType) < 0) { |
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118 PRINT((_L("Error: illegal MB type\n"))); |
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119 return MBK_ERROR; |
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120 } |
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121 |
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122 mb->type = hdr.type; |
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123 mb->intraType = hdr.intraType; |
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124 mb->intraMode = hdr.intraMode; |
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125 mb->interMode = hdr.interMode; |
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126 |
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127 for (i = 0; i < 4; i++) |
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128 mb->inter8x8modes[i] = hdr.inter8x8modes[i]; |
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129 |
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130 mb->cbpY = hdr.cbpY; |
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131 mb->cbpChromaDC = hdr.cbpChromaDC; |
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132 mb->cbpC = hdr.cbpC; |
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133 |
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134 mb->numSkipped -= 1; |
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135 } |
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136 |
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137 if (mb->type == MBK_INTRA && mb->intraType == MBK_INTRA_TYPE_PCM) { |
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138 vldGetAllCoeffs(numCoefPtrY, numCoefPtrU, numCoefPtrV, |
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139 mb->numCoefLeftPred, mb->numCoefLeftPredC); |
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140 return MBK_OK; |
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141 } |
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142 |
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143 /* |
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144 * 4x4 intra prediction modes |
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145 */ |
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146 if (mb->type == MBK_INTRA && mb->intraType == MBK_INTRA_TYPE1) { |
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147 |
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148 if (vldGetIntraPred(bitbuf, ipTab) < 0) { |
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149 PRINT((_L("Error: illegal intra pred\n"))); |
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150 return MBK_ERROR; |
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151 } |
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152 } |
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153 |
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154 /* |
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155 * 8x8 chroma intra prediction mode |
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156 */ |
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157 if (mb->type == MBK_INTRA) { |
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158 |
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159 mb->intraModeChroma = vldGetChromaIntraPred(bitbuf); |
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160 |
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161 if (mb->intraModeChroma < 0) { |
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162 PRINT((_L("Error: illegal chroma intra pred\n"))); |
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163 return MBK_ERROR; |
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164 } |
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165 } |
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166 |
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167 /* |
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168 * Reference frame number and motion vectors |
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169 */ |
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170 if (mb->type == MBK_INTER) { |
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171 |
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172 numVecs = mcpGetNumMotVecs(mb->interMode, mb->inter8x8modes); |
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173 mb->numMotVecs = numVecs; |
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174 |
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175 retCode = vldGetMotVecs(bitbuf, mb->interMode, numRefFrames, |
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176 mb->refNum, diffVecs, numVecs); |
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177 |
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178 if (retCode < 0) { |
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179 PRINT((_L("Error: illegal motion vectors\n"))); |
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180 return MBK_ERROR; |
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181 } |
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182 } |
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183 |
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184 /* |
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185 * Coded block pattern |
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186 */ |
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187 if (!(mb->type == MBK_INTRA && mb->intraType == MBK_INTRA_TYPE2)) { |
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188 |
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189 retCode = vldGetCBP(bitbuf, mb->type, &mb->cbpY, &mb->cbpChromaDC, &mb->cbpC); |
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190 |
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191 if (retCode < 0) { |
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192 PRINT((_L("Error: illegal CBP\n"))); |
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193 return MBK_ERROR; |
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194 } |
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195 } |
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196 |
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197 |
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198 /* Delta QP */ |
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199 if ((mb->type == MBK_INTRA && mb->intraType == MBK_INTRA_TYPE2) || |
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200 (mb->cbpY | mb->cbpChromaDC | mb->cbpC) != 0) |
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201 { |
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202 retCode = vldGetDeltaqp(bitbuf, &delta_qp); |
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203 |
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204 if (retCode < 0 || delta_qp < -(MAX_QP-MIN_QP+1)/2 || delta_qp >= (MAX_QP-MIN_QP+1)/2) { |
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205 PRINT((_L("Error: illegal delta qp\n"))); |
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206 return MBK_ERROR; |
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207 } |
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208 |
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209 if (delta_qp != 0) { |
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210 int qp = mb->qp + delta_qp; |
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211 if (qp < MIN_QP) |
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212 qp += (MAX_QP-MIN_QP+1); |
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213 if (qp > MAX_QP) |
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214 qp -= (MAX_QP-MIN_QP+1); |
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215 mb->qp = qp; |
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216 mb->qpC = qpChroma[clip(MIN_QP, MAX_QP, mb->qp + chromaQpIdx)]; |
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217 } |
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218 } |
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219 |
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220 |
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221 /* |
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222 * Get transform coefficients |
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223 */ |
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224 |
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225 /* |
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226 * Luma DC coefficients (if 16x16 intra) |
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227 */ |
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228 if (mb->type == MBK_INTRA && mb->intraType == MBK_INTRA_TYPE2) { |
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229 |
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230 retCode = vldGetLumaDCcoeffs(bitbuf, mb->dcCoefY, numCoefPtrY, |
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231 mb->numCoefLeftPred, mb->mbAvailBits); |
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232 if (retCode < 0) { |
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233 PRINT((_L("Error: illegal luma DC coefficient\n"))); |
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234 return MBK_ERROR; |
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235 } |
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236 } |
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237 |
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238 /* |
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239 * Luma AC coefficients |
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240 */ |
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241 if (mb->cbpY != 0) { |
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242 |
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243 retCode = vldGetLumaCoeffs(bitbuf, mb->type, mb->intraType, &mb->cbpY, |
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244 mb->coefY, numCoefPtrY, mb->numCoefLeftPred, |
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245 mb->mbAvailBits); |
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246 if (retCode < 0) { |
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247 PRINT((_L("Error: illegal luma AC coefficient\n"))); |
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248 return MBK_ERROR; |
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249 } |
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250 } |
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251 else |
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252 vldGetZeroLumaCoeffs(numCoefPtrY, mb->numCoefLeftPred); |
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253 |
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254 /* |
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255 * Chroma DC coefficients |
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256 */ |
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257 if (mb->cbpChromaDC != 0) { |
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258 |
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259 retCode = vldGetChromaDCcoeffs(bitbuf, mb->dcCoefC, &mb->cbpChromaDC); |
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260 |
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261 if (retCode < 0) { |
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262 PRINT((_L("Error: illegal chroma DC coefficient\n"))); |
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263 return MBK_ERROR; |
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264 } |
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265 } |
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266 |
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267 /* |
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268 * Chroma AC coefficients |
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269 */ |
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270 if (mb->cbpC != 0) { |
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271 |
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272 retCode = vldGetChromaCoeffs(bitbuf, mb->coefC, &mb->cbpC, numCoefPtrU, numCoefPtrV, |
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273 mb->numCoefLeftPredC[0], mb->numCoefLeftPredC[1], mb->mbAvailBits); |
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274 if (retCode < 0) { |
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275 PRINT((_L("Error: illegal chroma AC coefficient\n"))); |
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276 return MBK_ERROR; |
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277 } |
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278 } |
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279 else { |
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280 vldGetZeroChromaCoeffs(numCoefPtrU, numCoefPtrV, mb->numCoefLeftPredC); |
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281 } |
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282 |
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283 return MBK_OK; |
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284 } |
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285 |
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286 |
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287 /* |
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288 * |
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289 * mbkSetInitialQP: |
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290 * |
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291 * Parameters: |
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292 * mb Macroblock object |
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293 * qp Quantization parameter |
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294 * chromaQpIdx Chroma QP index relative to luma QP |
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295 * |
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296 * Function: |
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297 * Set macroblock qp. |
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298 * |
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299 * Returns: |
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300 * - |
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301 * |
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302 */ |
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303 void mbkSetInitialQP(macroblock_s *mb, int qp, int chromaQpIdx) |
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304 { |
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305 mb->qp = qp; |
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306 mb->qpC = qpChroma[clip(MIN_QP, MAX_QP, qp + chromaQpIdx)]; |
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307 |
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308 mb->numSkipped = -1; |
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309 } |
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310 |
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311 |
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312 /* |
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313 * |
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314 * getMbAvailability: |
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315 * |
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316 * Parameters: |
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317 * mb Macroblock object |
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318 * mbData Buffers for for macroblock attributes |
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319 * picWidth Picture width |
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320 * constrainedIntra Constrained intra prediction flag |
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321 * |
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322 * Function: |
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323 * Get neighboring macroblock availability info |
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324 * |
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325 * Returns: |
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326 * Macroblock availability bits: |
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327 * bit 0 : left macroblock |
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328 * bit 1 : upper macroblock |
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329 * bit 2 : upper-right macroblock |
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330 * bit 3 : upper-left macroblock |
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331 * bit 4 : left macroblock (intra) |
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332 * bit 5 : upper macroblock (intra) |
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333 * bit 6 : upper-right macroblock (intra) |
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334 * bit 7 : upper-left macroblock (intra) |
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335 */ |
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336 static int getMbAvailability(macroblock_s *mb, mbAttributes_s *mbData, |
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337 int picWidth, int constrainedIntra) |
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338 { |
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339 int mbsPerLine; |
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340 int mbAddr; |
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341 int currSliceIdx; |
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342 int *sliceMap; |
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343 int8 *mbTypeTable; |
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344 int mbAvailBits; |
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345 |
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346 mbsPerLine = picWidth/MBK_SIZE; |
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347 mbAddr = mb->idxY*mbsPerLine+mb->idxX; |
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348 |
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349 sliceMap = & mbData->sliceMap[mbAddr]; |
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350 currSliceIdx = sliceMap[0]; |
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351 |
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352 mbAvailBits = 0; |
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353 |
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354 /* Check availability of left macroblock */ |
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355 if (mb->idxX > 0 && sliceMap[-1] == currSliceIdx) |
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356 mbAvailBits |= 0x11; |
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357 |
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358 /* Check availability of upper, upper-left and upper-right macroblocks */ |
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359 |
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360 if (mb->idxY > 0) { |
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361 |
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362 sliceMap -= mbsPerLine; |
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363 |
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364 /* Check availability of upper macroblock */ |
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365 if (sliceMap[0] == currSliceIdx) |
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366 mbAvailBits |= 0x22; |
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367 |
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368 /* Check availability of upper-right macroblock */ |
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369 if (mb->idxX+1 < mbsPerLine && sliceMap[1] == currSliceIdx) |
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370 mbAvailBits |= 0x44; |
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371 |
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372 /* Check availability of upper-left macroblock */ |
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373 if (mb->idxX > 0 && sliceMap[-1] == currSliceIdx) |
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374 mbAvailBits |= 0x88; |
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375 } |
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376 |
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377 |
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378 /* |
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379 * Check availability of intra MB if constrained intra is enabled |
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380 */ |
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381 |
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382 if (constrainedIntra) { |
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383 |
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384 mbTypeTable = & mbData->mbTypeTable[mbAddr]; |
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385 |
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386 /* Check availability of left intra macroblock */ |
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387 if ((mbAvailBits & 0x10) && mbTypeTable[-1] != MBK_INTRA) |
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388 mbAvailBits &= ~0x10; |
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389 |
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390 /* Check availability of upper, upper-left and upper-right intra macroblocks */ |
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391 |
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392 if (mbAvailBits & (0x20|0x40|0x80)) { |
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393 |
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394 mbTypeTable -= mbsPerLine; |
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395 |
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396 /* Check availability of upper intra macroblock */ |
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397 if ((mbAvailBits & 0x20) && mbTypeTable[0] != MBK_INTRA) |
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398 mbAvailBits &= ~0x20; |
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399 |
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400 /* Check availability of upper-right intra macroblock */ |
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401 if ((mbAvailBits & 0x40) && mbTypeTable[1] != MBK_INTRA) |
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402 mbAvailBits &= ~0x40; |
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403 |
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404 /* Check availability of upper-left intra macroblock */ |
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405 if ((mbAvailBits & 0x80) && mbTypeTable[-1] != MBK_INTRA) |
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406 mbAvailBits &= ~0x80; |
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407 } |
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408 } |
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409 |
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410 return mbAvailBits; |
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411 } |
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412 |
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413 |
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414 // mbkParse |
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415 // Parses the input macroblock. If PCM coding is used then re-aligns the byte |
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416 // alignment if previous (slice header) modifications have broken the alignment. |
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417 TInt mbkParse(macroblock_s *mb, TInt numRefFrames, mbAttributes_s *mbData, |
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418 TInt picWidth, TInt picType, TInt constIpred, TInt chromaQpIdx, |
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419 TInt mbIdxX, TInt mbIdxY, void *streamBuf, TInt aBitOffset) |
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420 { |
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421 TInt8 ipTab[BLK_PER_MB*BLK_PER_MB]; |
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422 TInt diffVecs[BLK_PER_MB*BLK_PER_MB][2]; |
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423 // TInt hasDc; |
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424 // TInt pixOffset; |
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425 TInt constrainedIntra; |
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426 TInt copyMbFlag; |
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427 TInt mbAddr; |
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428 TInt pcmMbFlag; |
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429 TInt retCode; |
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430 |
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431 mb->idxX = mbIdxX; |
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432 mb->idxY = mbIdxY; |
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433 |
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434 mb->blkX = mbIdxX*BLK_PER_MB; |
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435 mb->blkY = mbIdxY*BLK_PER_MB; |
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436 |
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437 mb->pixX = mbIdxX*MBK_SIZE; |
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438 mb->pixY = mbIdxY*MBK_SIZE; |
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439 |
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440 mbAddr = mb->idxY*(picWidth/MBK_SIZE)+mb->idxX; |
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441 |
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442 copyMbFlag = pcmMbFlag = 0; |
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443 |
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444 constrainedIntra = constIpred && !(IS_SLICE_I(picType)); |
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445 |
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446 mb->mbAvailBits = getMbAvailability(mb, mbData, picWidth, constrainedIntra); |
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447 |
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448 // Read macroblock bits |
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449 retCode = getMacroblock(mb, numRefFrames, ipTab, mbData->numCoefUpPred, diffVecs, |
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450 picType, chromaQpIdx, (bitbuffer_s *)streamBuf); |
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451 |
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452 if (retCode < 0) |
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453 return retCode; |
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454 |
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455 // Set PCM flag |
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456 if (mb->type == MBK_INTRA && mb->intraType == MBK_INTRA_TYPE_PCM) |
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457 pcmMbFlag = 1; |
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458 |
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459 |
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460 // Get intra/inter prediction |
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461 if (mb->type == MBK_INTRA) |
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462 { |
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463 mbData->mbTypeTable[mbAddr] = MBK_INTRA; |
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464 |
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465 if (pcmMbFlag) |
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466 { |
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467 bitbuffer_s* tempBitBuffer = (bitbuffer_s *)streamBuf; |
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468 |
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469 // Synchronize bitbuffer bit position to get it between 1 and 8 |
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470 syncBitBufferBitpos(tempBitBuffer); |
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471 |
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472 // To find out how much we have to shift to reach the byte alignment again, |
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473 // we have to first find out the old alignment |
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474 // oldAlignment is the place of the bitpos before the aBitOffset, i.e. it is |
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475 // the amount of zero alignment bits plus one |
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476 TInt oldAlignmentBits = tempBitBuffer->bitpos + aBitOffset - 1; |
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477 TInt shiftAmount; |
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478 |
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479 |
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480 // If Bit-wise shift, i.e. aBitOffset is zero, do nothing |
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481 // Fix the possible bit buffer byte alignment |
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482 if (aBitOffset > 0) |
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483 { |
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484 |
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485 // aBitOffset > 0 indicates a bitshift to the right |
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486 |
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487 // To counter the shift to right we have to shift left by the same amount |
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488 // unless shift is larger than the number of original alignment bits in |
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489 // which case we have to shift more to the right |
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490 |
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491 // If the computed old alignment bits value is larger than eight, |
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492 //the correct value is (computed value) % 8 |
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493 oldAlignmentBits = oldAlignmentBits % 8; |
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494 |
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495 if ( oldAlignmentBits < aBitOffset ) |
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496 { |
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497 // When the amount of shift is larger than the number of original alignment bits, |
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498 // shift right to fill up the rest of the current byte with zeros |
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499 shiftAmount = 8 - aBitOffset; |
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500 |
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501 // Here we can't shift back left since there were not enough alignment bits originally, |
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502 // thus we have to shift right by new bit position - tempBitBuffer->bitpos |
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503 |
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504 // E.g. original alignment bits 2, right shift by 4 bits: |
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505 ///////////////////////////////////////////////////////////////// |
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506 // original after bit shift byte alignment reset |
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507 // 1. byte: 2. byte: 1. byte: 2. byte: 1. byte: 2. byte: 3. byte: |
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508 // xxxxxx00 yyyyyyyy -> xxxxxxxx xx00yyyy -> xxxxxxxx xx000000 yyyyyyyy |
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509 ///////////////////////////////////////////////////////////////// |
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510 ShiftBitBufferBitsRight(tempBitBuffer, shiftAmount); |
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511 } |
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512 else |
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513 { |
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514 // In this case, the old alignment bits are more than enough |
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515 // to shift back left by the aBitOffset amount |
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516 |
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517 // E.g. original alignment bits 4, right shift by 2 bits: |
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518 ///////////////////////////////////////////////////////////////// |
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519 // original after bit shift byte alignment reset |
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520 // 1. byte: 2. byte: 1. byte: 2. byte: 1. byte: 2. byte: |
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521 // xxxx0000 yyyyyyyy -> xxxxxx00 00yyyyyy -> xxxxxx00 yyyyyyyy |
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522 ///////////////////////////////////////////////////////////////// |
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523 ShiftBitBufferBitsLeft(tempBitBuffer, aBitOffset); |
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524 } |
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525 } |
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526 else if(aBitOffset < 0) |
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527 { |
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528 // There was a bit shift to left |
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529 // Change the aBitOffset sign to positive |
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530 aBitOffset = -aBitOffset; |
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531 |
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532 // If the computed alignment bits is negative the correct value is -(computed value) |
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533 if ( oldAlignmentBits < 0 ) |
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534 { |
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535 oldAlignmentBits = -oldAlignmentBits; |
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536 } |
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537 |
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538 if ( oldAlignmentBits + aBitOffset >= 8 ) |
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539 { |
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540 // When old alignment bits plus the shift are at least 8, then |
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541 // we have to shift left by the 8 - shift to reach byte alignment. |
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542 shiftAmount = 8 - aBitOffset; |
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543 |
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544 // E.g. original alignment bits 6, left shift by 4 bits: |
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545 ///////////////////////////////////////////////////////////////// |
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546 // original after bit shift byte alignment reset |
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547 // 1. byte: 2. byte: 1. byte: 2. byte: 1. byte: 2. byte: |
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548 // xx000000 yyyyyyyy -> xxxxxx00 0000yyyy -> xxxxxx00 yyyyyyyy |
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549 ///////////////////////////////////////////////////////////////// |
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550 ShiftBitBufferBitsLeft(tempBitBuffer, shiftAmount); |
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551 } |
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552 else |
|
553 { |
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554 |
|
555 // Here we can just shift right by the amount of bits shifted left to reach |
|
556 // the byte alignment |
|
557 |
|
558 // E.g. original alignment bits 2, left shift by 4 bits: |
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559 ///////////////////////////////////////////////////////////////// |
|
560 // original after bit shift byte alignment reset |
|
561 // 1. byte: 2. byte: 1. byte: 2. byte: 1. byte: 2. byte: |
|
562 // xxxxxx00 yyyyyyyy -> xx00yyyy yyyyyyyy -> xx000000 yyyyyyyy |
|
563 ///////////////////////////////////////////////////////////////// |
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564 ShiftBitBufferBitsRight(tempBitBuffer, aBitOffset); |
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565 } |
|
566 } |
|
567 |
|
568 return MBK_PCM_FOUND; |
|
569 |
|
570 } |
|
571 } |
|
572 else |
|
573 { |
|
574 |
|
575 mbData->mbTypeTable[mbAddr] = (TInt8)(mb->interMode+1); |
|
576 |
|
577 // If COPY MB, put skip motion vectors |
|
578 if (mb->interMode == MOT_COPY) |
|
579 { |
|
580 mb->interMode = MOT_16x16; |
|
581 } |
|
582 |
|
583 } |
|
584 |
|
585 |
|
586 // Decode prediction error & reconstruct MB |
|
587 if (!copyMbFlag && !pcmMbFlag) |
|
588 { |
|
589 |
|
590 // If 4x4 intra mode, luma prediction error is already transformed |
|
591 if (!(mb->type == MBK_INTRA && mb->intraType == MBK_INTRA_TYPE1)) |
|
592 { |
|
593 |
|
594 // hasDc = (mb->type == MBK_INTRA && mb->intraType == MBK_INTRA_TYPE2) ? 1 : 0; |
|
595 |
|
596 } |
|
597 |
|
598 // pixOffset = ((mb->pixY*picWidth)>>2)+(mb->pixX>>1); |
|
599 } |
|
600 |
|
601 |
|
602 // Store qp and coded block pattern for current macroblock |
|
603 if (pcmMbFlag) |
|
604 mbData->qpTable[mbAddr] = 0; |
|
605 else |
|
606 mbData->qpTable[mbAddr] = (TInt8)mb->qp; |
|
607 |
|
608 mbData->cbpTable[mbAddr] = mb->cbpY; |
|
609 |
|
610 return MBK_OK; |
|
611 } |
|
612 |