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 * MPEG-4 VOL header parsing. |
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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 // INCLUDE FILES |
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22 #include "mpegcons.h" |
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23 #include "VedVolReader.h" |
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24 |
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25 |
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26 |
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27 // MACROS |
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28 #ifdef _DEBUG |
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29 #include <e32svr.h> |
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30 #define PRINT(x) RDebug::Print x; |
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31 #else |
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32 #define PRINT(x) |
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33 #endif |
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34 |
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35 |
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36 |
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37 // CONSTANTS |
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38 const TUint8 CVedVolReader::KMsbMask[] = {1, 3, 7, 15, 31, 63, 127, 255}; |
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39 const TUint8 CVedVolReader::KLsbMask[] = {255, 254, 252, 248, 240, 224, 192, 128, 0}; |
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40 |
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41 const TInt CVedVolReader::KMaxUserDataLength = 512; |
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42 |
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43 |
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44 |
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45 // ================= MEMBER FUNCTIONS ======================= |
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46 |
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47 // Two-phased constructor |
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48 EXPORT_C CVedVolReader* CVedVolReader::NewL() |
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49 { |
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50 CVedVolReader* self = new (ELeave) CVedVolReader(); |
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51 CleanupStack::PushL(self); |
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52 self->ConstructL(); |
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53 CleanupStack::Pop(self); |
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54 return self; |
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55 } |
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56 |
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57 |
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58 // C++ default constructor |
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59 CVedVolReader::CVedVolReader() : iBitstreamMode(EVedVideoBitstreamModeUnknown) |
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60 { |
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61 // Reset the header data to zeroes |
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62 Mem::FillZ(&iHeader, sizeof(TVolHeader)); |
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63 } |
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64 |
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65 // Symbian OS default constructor can leave |
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66 void CVedVolReader::ConstructL() |
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67 { |
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68 } |
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69 |
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70 // Destructor |
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71 CVedVolReader::~CVedVolReader() |
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72 { |
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73 if (iHeader.iUserData != 0) |
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74 { |
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75 delete iHeader.iUserData; |
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76 } |
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77 } |
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78 |
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79 // --------------------------------------------------------- |
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80 // CVedVolReader::ParseVolHeaderL |
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81 // Parses given Video Object Layer header |
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82 // --------------------------------------------------------- |
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83 // |
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84 EXPORT_C TInt CVedVolReader::ParseVolHeaderL(TDesC8& aData) |
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85 { |
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86 TInt useDefaultVBVParams = 0; |
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87 TInt numBits; |
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88 TUint32 bits; |
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89 |
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90 // Reset the header data |
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91 if (iHeader.iUserData != 0) |
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92 { |
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93 delete iHeader.iUserData; |
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94 iHeader.iUserData = 0; |
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95 } |
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96 Mem::FillZ(&iHeader, sizeof(TVolHeader)); |
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97 iBitstreamMode = EVedVideoBitstreamModeUnknown; |
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98 iHeaderSize = 0; |
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99 |
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100 // Check that we have something to parse |
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101 if (aData.Length() == 0) |
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102 { |
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103 User::Leave(KErrNotFound); |
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104 } |
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105 |
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106 TSeqHeaderBuffer buffer(aData, 0, 7); // Bit 7 is the first bit in a byte |
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107 |
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108 // if H.263 PSC is present |
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109 bits = ReadSeqHeaderBits(buffer, 22, EFalse); |
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110 if (bits == 32) |
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111 { |
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112 // This is H.263 so there are no VOL headers |
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113 iBitstreamMode = EVedVideoBitstreamModeH263; |
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114 return KErrNone; |
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115 } |
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116 |
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117 // if Visual Object Sequence Start Code is present |
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118 bits = ReadSeqHeaderBits(buffer, MP4_VOS_START_CODE_LENGTH, EFalse); |
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119 if (bits == MP4_VOS_START_CODE) |
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120 { |
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121 // vos_start_code |
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122 ReadSeqHeaderBits(buffer, MP4_VOS_START_CODE_LENGTH, ETrue); |
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123 |
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124 // profile_and_level_indication (8 bits) |
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125 bits = ReadSeqHeaderBits(buffer, 8, ETrue); |
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126 // 8: Simple Profile Level 0 (from ISO/IEC 14496-2:1999/FPDAM4 [N3670] October 2000) |
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127 // 9: Simple Profile Level 0b |
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128 // 1: Simple Profile Level 1 |
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129 // 2: Simple Profile Level 2 |
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130 // 3: Simple Profile Level 3 |
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131 // 4: Simple Profile Level 4a |
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132 if (bits != 1 && bits != 2 && bits != 3 && bits != 4 && bits != 8 && bits != 9) |
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133 { |
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134 // Profile level id was not recognized so take a guess |
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135 // This is changed later if resolution does not match |
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136 bits = 9; |
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137 } |
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138 |
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139 iHeader.iProfileLevelId = (TInt) bits; |
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140 |
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141 ReadUserDataL(buffer); |
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142 } |
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143 |
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144 // if Visual Object Start Code is present |
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145 bits = ReadSeqHeaderBits(buffer, MP4_VO_START_CODE_LENGTH, EFalse); |
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146 if (bits == MP4_VO_START_CODE) |
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147 { |
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148 // visual_object_start_code |
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149 ReadSeqHeaderBits(buffer, MP4_VO_START_CODE_LENGTH, ETrue); |
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150 |
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151 // is_visual_object_identifier (1 bit) |
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152 bits = ReadSeqHeaderBits(buffer, 1, ETrue); |
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153 if (bits) |
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154 { |
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155 // visual_object_ver_id (4 bits) |
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156 bits = ReadSeqHeaderBits(buffer, 4, ETrue); |
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157 if (bits != 1 && bits != 2) |
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158 { |
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159 // this is not an MPEG-4 version 1 or 2 stream |
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160 PRINT((_L("CVedVolReader: ERROR - This is not an MPEG-4 version 1 or 2 stream"))) |
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161 User::Leave(KErrNotSupported); |
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162 } |
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163 |
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164 // visual_object_priority (3 bits) |
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165 bits = ReadSeqHeaderBits(buffer, 3, ETrue); |
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166 iHeader.iVoPriority = (TInt) bits; |
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167 } |
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168 else |
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169 { |
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170 iHeader.iVoPriority = 0; |
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171 } |
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172 |
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173 // visual_object_type (4 bits) |
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174 bits = ReadSeqHeaderBits(buffer, 4, ETrue); |
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175 if (bits != 1) |
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176 { |
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177 // this is not a video object |
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178 PRINT((_L("CVedVolReader: ERROR - This is not a video object"))) |
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179 User::Leave(KErrNotSupported); |
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180 } |
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181 |
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182 // is_video_signal_type (1 bit) |
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183 bits = ReadSeqHeaderBits(buffer, 1, ETrue); |
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184 if (bits) |
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185 { |
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186 /* Note: The following fields in the bitstream give information about the |
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187 video signal type before encoding. These parameters don't influence the |
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188 decoding algorithm, but the composition at the output of the video decoder. |
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189 Until a way to utilize them is found, these fields are just dummyly read, |
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190 but not interpreted. |
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191 For interpretation see the MPEG-4 Visual standard page 66-70. */ |
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192 |
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193 // video_format (3 bits) |
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194 bits = ReadSeqHeaderBits(buffer, 3, ETrue); |
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195 iHeader.iVideoFormat = (TInt) bits; |
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196 |
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197 // video_range (1 bit) |
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198 bits = ReadSeqHeaderBits(buffer, 1, ETrue); |
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199 iHeader.iVideoRange = (TInt) bits; |
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200 |
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201 // colour_description (1 bit) |
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202 bits = ReadSeqHeaderBits(buffer, 1, ETrue); |
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203 if (bits) |
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204 { |
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205 // colour_primaries (8 bits) |
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206 bits = ReadSeqHeaderBits(buffer, 8, ETrue); |
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207 iHeader.iColourPrimaries = (TInt) bits; |
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208 |
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209 // transfer_characteristics (8 bits) |
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210 bits = ReadSeqHeaderBits(buffer, 8, ETrue); |
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211 iHeader.iTransferCharacteristics = (TInt) bits; |
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212 |
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213 // matrix_coefficients (8 bits) |
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214 bits = ReadSeqHeaderBits(buffer, 8, ETrue); |
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215 iHeader.iMatrixCoefficients = (TInt) bits; |
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216 } |
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217 else |
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218 { |
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219 iHeader.iColourPrimaries = 1; // default: ITU-R BT.709 |
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220 iHeader.iTransferCharacteristics = 1; // default: ITU-R BT.709 |
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221 iHeader.iMatrixCoefficients = 1; // default: ITU-R BT.709 |
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222 } |
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223 } |
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224 else |
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225 { |
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226 // default values |
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227 iHeader.iVideoFormat = 5; // Unspecified video format |
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228 iHeader.iVideoRange = 0; // Y range 16-235 pixel values |
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229 iHeader.iColourPrimaries = 1; // ITU-R BT.709 |
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230 iHeader.iTransferCharacteristics = 1; // ITU-R BT.709 |
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231 iHeader.iMatrixCoefficients = 1; // ITU-R BT.709 |
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232 } |
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233 |
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234 // check the next start code |
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235 ReadSeqHeaderBits(buffer, 1, ETrue); |
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236 if (buffer.iBitInOctet != 7) |
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237 { |
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238 numBits = buffer.iBitInOctet + 1; |
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239 |
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240 bits = ReadSeqHeaderBits(buffer, numBits, ETrue); |
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241 if (bits != (TUint32) ((1 << numBits)-1)) |
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242 { |
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243 // stuffing error in VO |
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244 PRINT((_L("CVedVolReader: ERROR - Stuffing error"))) |
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245 User::Leave(KErrNotSupported); |
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246 } |
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247 } |
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248 |
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249 ReadUserDataL(buffer); |
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250 } |
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251 |
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252 // if Video Object Start Code is present |
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253 bits = ReadSeqHeaderBits(buffer, MP4_VID_START_CODE_LENGTH, EFalse); |
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254 if (bits == MP4_VID_START_CODE) |
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255 { |
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256 // video_object_start_code |
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257 ReadSeqHeaderBits(buffer, MP4_VID_START_CODE_LENGTH, ETrue); |
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258 |
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259 // video_object_id |
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260 bits = ReadSeqHeaderBits(buffer, MP4_VID_ID_CODE_LENGTH, ETrue); |
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261 iHeader.iVoId = (TInt) bits; |
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262 } |
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263 |
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264 // Check if H.263 PSC follows the VO header, in which case this is MPEG-4 with short header |
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265 bits = ReadSeqHeaderBits(buffer, 22, EFalse); |
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266 if (bits == 32 || buffer.iData.Length() <= buffer.iGetIndex) |
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267 { |
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268 iBitstreamMode = EVedVideoBitstreamModeMPEG4ShortHeader; |
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269 |
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270 // Calculate the header size in bytes |
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271 if (buffer.iBitInOctet == 7) |
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272 { |
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273 // The size is a multiple of 8 bits so the size is the number of bytes we've read so far |
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274 iHeaderSize = buffer.iGetIndex; |
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275 } |
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276 else |
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277 { |
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278 // Round up to the next full byte |
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279 iHeaderSize = buffer.iGetIndex + 1; |
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280 } |
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281 |
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282 // We no longer support short header clips |
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283 User::Leave(KErrNotSupported); |
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284 } |
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285 |
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286 // vol_start_code |
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287 bits = ReadSeqHeaderBits(buffer, MP4_VOL_START_CODE_LENGTH, ETrue); |
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288 if(bits != MP4_VOL_START_CODE) |
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289 { |
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290 PRINT((_L("CVedVolReader: ERROR - Bitstream does not start with MP4_VOL_START_CODE"))) |
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291 User::Leave(KErrCorrupt); |
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292 } |
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293 |
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294 // vol_id |
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295 bits = ReadSeqHeaderBits(buffer, MP4_VOL_ID_CODE_LENGTH, ETrue); |
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296 iHeader.iVolId = (TInt) bits; |
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297 |
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298 // random_accessible_vol (1 bit) |
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299 bits = ReadSeqHeaderBits(buffer, 1, ETrue); |
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300 iHeader.iRandomAccessibleVol = (TUint8) bits; |
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301 |
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302 // video_object_type_indication (8 bits) |
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303 bits = ReadSeqHeaderBits(buffer, 8, ETrue); |
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304 if (bits != 1) |
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305 { |
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306 // this is not a simple video object stream |
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307 PRINT((_L("CVedVolReader: ERROR - This is not a simple video object stream"))) |
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308 User::Leave(KErrNotSupported); |
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309 } |
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310 |
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311 // is_object_layer_identifier (1 bit) |
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312 bits = ReadSeqHeaderBits(buffer, 1, ETrue); |
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313 if (bits) |
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314 { |
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315 // visual_object_ver_id (4 bits) |
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316 bits = ReadSeqHeaderBits(buffer, 4, ETrue); |
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317 if (bits != 1 && bits != 2) |
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318 { |
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319 // this is not an MPEG-4 version 1 or 2 stream |
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320 PRINT((_L("CVedVolReader: ERROR - This is not an MPEG-4 version 1 or 2 stream"))) |
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321 User::Leave(KErrNotSupported); |
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322 } |
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323 |
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324 // video_object_layer_priority (3 bits) |
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325 bits = ReadSeqHeaderBits(buffer, 3, ETrue); |
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326 iHeader.iVoPriority = (TInt) bits; |
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327 } |
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328 |
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329 // aspect_ratio_info: `0010`- 12:11 (625-type for 4:3 picture) |
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330 bits = ReadSeqHeaderBits(buffer, 4, ETrue); |
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331 iHeader.iPixelAspectRatio = (TInt) bits; |
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332 |
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333 // extended par |
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334 if (bits == 15) |
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335 { |
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336 // par_width |
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337 bits = ReadSeqHeaderBits(buffer, 8, ETrue); |
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338 // par_height |
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339 bits = ReadSeqHeaderBits(buffer, 8, ETrue); |
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340 } |
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341 |
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342 // vol_control_parameters flag |
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343 bits = ReadSeqHeaderBits(buffer, 1, ETrue); |
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344 if (bits) |
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345 { |
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346 // chroma_format (2 bits) |
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347 bits = ReadSeqHeaderBits(buffer, 2, ETrue); |
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348 if (bits != 1) |
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349 { |
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350 PRINT((_L("CVedVolReader: ERROR - Not supported chroma format"))) |
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351 User::Leave(KErrNotSupported); |
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352 } |
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353 |
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354 // low_delay (1 bits) |
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355 bits = ReadSeqHeaderBits(buffer, 1, ETrue); |
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356 |
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357 // vbv_parameters (1 bits) |
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358 bits = ReadSeqHeaderBits(buffer, 1, ETrue); |
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359 if (bits) |
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360 { |
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361 // first_half_bitrate (15 bits) |
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362 bits = ReadSeqHeaderBits(buffer, 15, ETrue); |
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363 iHeader.iBitRate = (bits << 15); |
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364 |
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365 // marker_bit |
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366 if (!ReadSeqHeaderBits(buffer, 1, ETrue)) |
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367 { |
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368 User::Leave(KErrCorrupt); |
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369 } |
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370 |
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371 // latter_half_bitrate (15 bits) |
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372 bits = ReadSeqHeaderBits(buffer, 15, ETrue); |
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373 iHeader.iBitRate += bits; |
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374 iHeader.iBitRate *= 400; |
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375 |
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376 // marker_bit |
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377 if (!ReadSeqHeaderBits(buffer, 1, ETrue)) |
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378 { |
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379 User::Leave(KErrCorrupt); |
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380 } |
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381 |
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382 // first_half_vbv_buffer_size (15 bits) |
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383 bits = ReadSeqHeaderBits(buffer, 15, ETrue); |
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384 iHeader.iVbvBufferSize = (bits << 3); |
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385 |
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386 // marker_bit |
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387 if (!ReadSeqHeaderBits(buffer, 1, ETrue)) |
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388 { |
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389 User::Leave(KErrCorrupt); |
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390 } |
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391 |
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392 // latter_half_vbv_buffer_size (3 bits) |
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393 bits = ReadSeqHeaderBits(buffer, 3, ETrue); |
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394 iHeader.iVbvBufferSize += bits; |
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395 iHeader.iVbvBufferSize *= 16384; |
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396 |
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397 // first_half_vbv_occupancy (11 bits) |
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398 bits = ReadSeqHeaderBits(buffer, 11, ETrue); |
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399 iHeader.iVbvOccupancy = (bits << 15); |
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400 |
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401 // marker_bit |
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402 if (!ReadSeqHeaderBits(buffer, 1, ETrue)) |
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403 { |
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404 User::Leave(KErrCorrupt); |
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405 } |
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406 |
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407 // latter_half_vbv_occupancy (15 bits) |
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408 bits = ReadSeqHeaderBits(buffer, 15, ETrue); |
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409 iHeader.iVbvOccupancy += bits; |
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410 iHeader.iVbvOccupancy *= 64; |
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411 |
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412 // marker_bit |
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413 if (!ReadSeqHeaderBits(buffer, 1, ETrue)) |
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414 { |
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415 User::Leave(KErrCorrupt); |
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416 } |
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417 } |
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418 else |
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419 { |
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420 useDefaultVBVParams = 1; |
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421 } |
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422 } |
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423 else |
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424 { |
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425 useDefaultVBVParams = 1; |
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426 } |
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427 |
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428 // vol_shape (2 bits) |
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429 bits = ReadSeqHeaderBits(buffer, 2, ETrue); |
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430 // rectangular_shape = '00' |
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431 if (bits != 0) |
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432 { |
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433 PRINT((_L("CVedVolReader: ERROR - Not rectangular shape is not supported"))) |
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434 User::Leave(KErrNotSupported); |
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435 } |
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436 |
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437 // marker_bit |
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438 if (!ReadSeqHeaderBits(buffer, 1, ETrue)) |
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439 { |
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440 User::Leave(KErrCorrupt); |
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441 } |
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442 |
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443 // time_increment_resolution |
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444 bits = ReadSeqHeaderBits(buffer, 16, ETrue); |
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445 iHeader.iTimeIncrementResolution = (TInt) bits; |
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446 |
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447 // marker_bit |
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448 if (!ReadSeqHeaderBits(buffer, 1, ETrue)) |
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449 { |
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450 User::Leave(KErrCorrupt); |
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451 } |
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452 |
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453 // fixed_vop_rate |
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454 bits = ReadSeqHeaderBits(buffer, 1, ETrue); |
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455 |
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456 // fixed_vop_time_increment (1-15 bits) |
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457 if (bits) |
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458 { |
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459 for (numBits = 1; ((iHeader.iTimeIncrementResolution-1) >> numBits) != 0; numBits++) |
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460 { |
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461 } |
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462 |
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463 bits = ReadSeqHeaderBits(buffer, numBits, ETrue); |
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464 } |
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465 |
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466 // marker_bit |
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467 if (!ReadSeqHeaderBits(buffer, 1, ETrue)) |
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468 { |
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469 User::Leave(KErrCorrupt); |
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470 } |
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471 |
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472 // vol_width (13 bits) |
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473 bits = ReadSeqHeaderBits(buffer, 13, ETrue); |
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474 iHeader.iLumWidth = (TInt) bits; |
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475 |
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476 // marker_bit |
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477 if (!ReadSeqHeaderBits(buffer, 1, ETrue)) |
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478 { |
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479 User::Leave(KErrCorrupt); |
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480 } |
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481 |
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482 // vol_height (13 bits) |
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483 bits = ReadSeqHeaderBits(buffer, 13, ETrue); |
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484 iHeader.iLumHeight = (TInt) bits; |
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485 |
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486 // Accept only resolutions that are divisible by 16 |
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487 if ( ((iHeader.iLumWidth & 0x0000000f) != 0) || |
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488 ((iHeader.iLumHeight & 0x0000000f) != 0) ) |
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489 { |
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490 PRINT((_L("CVedVolReader: ERROR - Unsupported resolution"))) |
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491 User::Leave(KErrNotSupported); |
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492 } |
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493 |
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494 TInt macroBlocks = iHeader.iLumWidth * iHeader.iLumHeight / (16 * 16); |
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495 |
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496 // Check that we don't have too many macro blocks (ie resolution is not too big) |
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497 if( macroBlocks > 1200 ) |
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498 { |
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499 PRINT((_L("CVedVolReader: ERROR - Unsupported resolution"))) |
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500 User::Leave(KErrNotSupported); |
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501 } |
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502 |
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503 // Check that profile level id matches with the number of macro blocks |
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504 if( macroBlocks > 396 ) |
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505 { |
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506 // Resolution is higher than CIF => level must be 4a |
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507 if( iHeader.iProfileLevelId != 4 ) |
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508 { |
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509 iHeader.iProfileLevelId = 4; |
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510 useDefaultVBVParams = 1; |
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511 } |
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512 } |
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513 else if( macroBlocks > 99 ) |
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514 { |
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515 // Resolution is higher than QCIF => level must be atleast 2 |
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516 if( iHeader.iProfileLevelId < 2 || iHeader.iProfileLevelId > 4 ) |
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517 { |
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518 iHeader.iProfileLevelId = 3; // QVGA/CIF @ 30fps |
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519 useDefaultVBVParams = 1; |
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520 } |
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521 } |
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522 |
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523 // Set default VBV params if not set already |
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524 if (useDefaultVBVParams) |
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525 { |
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526 switch (iHeader.iProfileLevelId) |
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527 { |
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528 case 1: |
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529 iHeader.iVbvBufferSize = 10; |
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530 iHeader.iBitRate = 64; |
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531 break; |
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532 case 2: |
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533 iHeader.iVbvBufferSize = 20; |
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534 iHeader.iBitRate = 128; |
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535 break; |
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536 case 4: |
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537 iHeader.iVbvBufferSize = 80; |
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538 iHeader.iBitRate = 4000; |
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539 break; |
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540 case 8: |
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541 iHeader.iVbvBufferSize = 10; |
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542 iHeader.iBitRate = 64; |
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543 break; |
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544 case 9: |
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545 iHeader.iVbvBufferSize = 20; |
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546 iHeader.iBitRate = 128; |
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547 break; |
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548 default: |
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549 iHeader.iVbvBufferSize = 20; |
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550 iHeader.iBitRate = 384; |
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551 break; |
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552 } |
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553 |
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554 iHeader.iVbvOccupancy = iHeader.iVbvBufferSize * 170; |
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555 |
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556 iHeader.iVbvOccupancy *= 64; |
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557 iHeader.iVbvBufferSize *= 16384; |
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558 iHeader.iBitRate *= 1024; |
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559 } |
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560 |
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561 // marker_bit |
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562 if (!ReadSeqHeaderBits(buffer, 1, ETrue)) |
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563 { |
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564 User::Leave(KErrCorrupt); |
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565 } |
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566 |
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567 // interlaced (1 bit) |
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568 bits = ReadSeqHeaderBits(buffer, 1, ETrue); |
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569 if (bits) |
|
570 { |
|
571 PRINT((_L("CVedVolReader: ERROR - Interlaced VOP not supported"))) |
|
572 User::Leave(KErrNotSupported); |
|
573 } |
|
574 |
|
575 // OBMC_disable |
|
576 bits = ReadSeqHeaderBits(buffer, 1, ETrue); |
|
577 if (!bits) |
|
578 { |
|
579 PRINT((_L("CVedVolReader: ERROR - Overlapped motion compensation not supported"))) |
|
580 User::Leave(KErrNotSupported); |
|
581 } |
|
582 |
|
583 // sprite_enable (1 bit) |
|
584 bits = ReadSeqHeaderBits(buffer, 1, ETrue); |
|
585 if (bits) |
|
586 { |
|
587 PRINT((_L("CVedVolReader: ERROR - Sprites not supported"))) |
|
588 User::Leave(KErrNotSupported); |
|
589 } |
|
590 |
|
591 // not_8_bit (1 bit) |
|
592 bits = ReadSeqHeaderBits(buffer, 1, ETrue); |
|
593 if (bits) |
|
594 { |
|
595 PRINT((_L("CVedVolReader: ERROR - Not 8 bits/pixel not supported"))) |
|
596 User::Leave(KErrNotSupported); |
|
597 } |
|
598 |
|
599 // quant_type (1 bit) |
|
600 bits = ReadSeqHeaderBits(buffer, 1, ETrue); |
|
601 if (bits) |
|
602 { |
|
603 PRINT((_L("CVedVolReader: ERROR - H.263/MPEG-2 Quant Table switch not supported"))) |
|
604 User::Leave(KErrNotSupported); |
|
605 } |
|
606 |
|
607 // complexity_estimation_disable (1 bit) |
|
608 bits = ReadSeqHeaderBits(buffer, 1, ETrue); |
|
609 if (!bits) |
|
610 { |
|
611 PRINT((_L("CVedVolReader: ERROR - Complexity estimation header not supported"))) |
|
612 User::Leave(KErrNotSupported); |
|
613 } |
|
614 |
|
615 // resync_marker_disable (1 bit) |
|
616 bits = ReadSeqHeaderBits(buffer, 1, ETrue); |
|
617 iHeader.iErrorResDisable = (TUint8) bits; |
|
618 |
|
619 // data_partitioned (1 bit) |
|
620 bits = ReadSeqHeaderBits(buffer, 1, ETrue); |
|
621 iHeader.iDataPartitioned = (TUint8) bits; |
|
622 |
|
623 if (iHeader.iDataPartitioned) |
|
624 { |
|
625 // reversible_vlc (1 bit) |
|
626 bits = ReadSeqHeaderBits(buffer, 1, ETrue); |
|
627 iHeader.iReversibleVlc = (TUint8) bits; |
|
628 } |
|
629 |
|
630 // scalability (1 bit) |
|
631 bits = ReadSeqHeaderBits(buffer, 1, ETrue); |
|
632 if (bits) |
|
633 { |
|
634 PRINT((_L("CVedVolReader: ERROR - Scalability not supported"))) |
|
635 User::Leave(KErrNotSupported); |
|
636 } |
|
637 |
|
638 // check the next start code |
|
639 ReadSeqHeaderBits(buffer, 1, ETrue); |
|
640 if (buffer.iBitInOctet != 7) |
|
641 { |
|
642 numBits = buffer.iBitInOctet + 1; |
|
643 |
|
644 bits = ReadSeqHeaderBits(buffer, numBits, ETrue); |
|
645 |
|
646 /* Removed temporarily |
|
647 if (bits != (TUint32) ((1 << numBits)-1)) |
|
648 { |
|
649 // this is not a video object |
|
650 PRINT((_L("CVedVolReader: ERROR - Stuffing error"))) |
|
651 User::Leave(KErrNotSupported); |
|
652 }*/ |
|
653 } |
|
654 |
|
655 ReadUserDataL(buffer); |
|
656 |
|
657 // Calculate the header size in bytes |
|
658 if (buffer.iBitInOctet == 7) |
|
659 { |
|
660 // The size is a multiple of 8 bits so the size is the number of bytes we've read so far |
|
661 iHeaderSize = buffer.iGetIndex; |
|
662 } |
|
663 else |
|
664 { |
|
665 // Round up to the next full byte |
|
666 iHeaderSize = buffer.iGetIndex + 1; |
|
667 } |
|
668 |
|
669 // Determine the bitstream mode |
|
670 iBitstreamMode = CheckBitstreamMode(iHeader.iErrorResDisable, iHeader.iDataPartitioned, iHeader.iReversibleVlc); |
|
671 |
|
672 // If no error in bit buffer functions |
|
673 return KErrNone; |
|
674 } |
|
675 |
|
676 // --------------------------------------------------------- |
|
677 // CVedVolReader::ReadSeqHeaderBits |
|
678 // Reads requested bits from given buffer |
|
679 // --------------------------------------------------------- |
|
680 // |
|
681 TUint32 CVedVolReader::ReadSeqHeaderBits(TSeqHeaderBuffer& aBuffer, TInt aNumBits, TBool aFlush) |
|
682 { |
|
683 TUint startIndex; // the index of the first byte to read |
|
684 TUint startMask; // the mask for the first byte |
|
685 TUint endIndex; // the index of the last byte to read |
|
686 TUint endMask; // the mask for the last byte |
|
687 TUint endShift; // the number of shifts after masking the last byte |
|
688 TUint endNumberOfBits; // the number of bits in the last byte |
|
689 TUint newBitIndex; // bitIndex after getting the bits |
|
690 TUint newGetIndex; // getIndex after getting the bits |
|
691 |
|
692 TUint32 returnValue = 0; |
|
693 |
|
694 startIndex = aBuffer.iGetIndex; |
|
695 startMask = KMsbMask[aBuffer.iBitInOctet]; |
|
696 |
|
697 // Check that there are enough bits left |
|
698 if (startIndex * 8 + aNumBits > aBuffer.iData.Length() * 8) |
|
699 { |
|
700 return 0; |
|
701 } |
|
702 |
|
703 if (aBuffer.iBitInOctet + 1 >= aNumBits) |
|
704 { |
|
705 // The bits are within one byte. |
|
706 endShift = aBuffer.iBitInOctet - aNumBits + 1; |
|
707 endMask = KLsbMask[endShift]; |
|
708 returnValue = (aBuffer.iData[startIndex] & startMask & endMask) >> endShift; |
|
709 if (endShift > 0) |
|
710 { |
|
711 newBitIndex = aBuffer.iBitInOctet - aNumBits; |
|
712 newGetIndex = aBuffer.iGetIndex; |
|
713 } |
|
714 else |
|
715 { |
|
716 newBitIndex = 7; |
|
717 newGetIndex = aBuffer.iGetIndex + 1; |
|
718 } |
|
719 } |
|
720 else |
|
721 { |
|
722 // The bits are in multiple bytes. |
|
723 aNumBits -= aBuffer.iBitInOctet + 1; |
|
724 endNumberOfBits = aNumBits & 7; |
|
725 |
|
726 newBitIndex = 7 - endNumberOfBits; |
|
727 newGetIndex = aBuffer.iGetIndex + (aNumBits >> 3) + 1; |
|
728 |
|
729 // Calculate the return value. |
|
730 endIndex = newGetIndex; |
|
731 endShift = 8 - (aNumBits & 7); |
|
732 endMask = KLsbMask[endShift]; |
|
733 |
|
734 returnValue = aBuffer.iData[startIndex] & startMask; |
|
735 startIndex++; |
|
736 |
|
737 while (startIndex != endIndex) |
|
738 { |
|
739 returnValue <<= 8; |
|
740 returnValue += (TUint8) aBuffer.iData[startIndex]; |
|
741 startIndex++; |
|
742 } |
|
743 |
|
744 if (endNumberOfBits != 0) |
|
745 { |
|
746 returnValue <<= endNumberOfBits; |
|
747 returnValue += (aBuffer.iData[startIndex] & endMask) >> endShift; |
|
748 } |
|
749 } |
|
750 |
|
751 if (aFlush) |
|
752 { |
|
753 // Update indexes. |
|
754 aBuffer.iGetIndex = newGetIndex; |
|
755 aBuffer.iBitInOctet = newBitIndex; |
|
756 } |
|
757 |
|
758 return returnValue; |
|
759 } |
|
760 |
|
761 // --------------------------------------------------------- |
|
762 // CVedVolReader::ReadUserDataL |
|
763 // Reads user data from given buffer |
|
764 // --------------------------------------------------------- |
|
765 // |
|
766 void CVedVolReader::ReadUserDataL(TSeqHeaderBuffer& aBuffer) |
|
767 { |
|
768 TUint32 bits; |
|
769 |
|
770 // Check if User data is available |
|
771 bits = ReadSeqHeaderBits(aBuffer, 32, EFalse); |
|
772 if (bits == MP4_USER_DATA_START_CODE) |
|
773 { |
|
774 if (iHeader.iUserData == 0) |
|
775 { |
|
776 iHeader.iUserData = HBufC8::NewL(KMaxUserDataLength); |
|
777 } |
|
778 |
|
779 TInt i = iHeader.iUserData->Length(); |
|
780 do |
|
781 { |
|
782 bits = ReadSeqHeaderBits(aBuffer, 8, ETrue); |
|
783 if (i++ < KMaxUserDataLength) |
|
784 { |
|
785 (iHeader.iUserData->Des()).Append(TChar(bits)); |
|
786 } |
|
787 } |
|
788 while (aBuffer.iData.Length() > aBuffer.iGetIndex && |
|
789 ReadSeqHeaderBits(aBuffer, 24, EFalse) != 0x1); |
|
790 } |
|
791 } |
|
792 |
|
793 // --------------------------------------------------------- |
|
794 // CVedVolReader::CheckBitstreamMode |
|
795 // Checks what is the bit stream mode the video |
|
796 // --------------------------------------------------------- |
|
797 // |
|
798 TVedVideoBitstreamMode CVedVolReader::CheckBitstreamMode(TUint8 aErd, TUint8 aDp, TUint8 aRvlc) |
|
799 { |
|
800 TVedVideoBitstreamMode mode = EVedVideoBitstreamModeUnknown; |
|
801 int combination = ((!aErd) << 2) | (aDp << 1) | aRvlc; |
|
802 |
|
803 switch (combination) |
|
804 { |
|
805 case 0: |
|
806 mode = EVedVideoBitstreamModeMPEG4Regular; |
|
807 break; |
|
808 case 2: |
|
809 mode = EVedVideoBitstreamModeMPEG4DP; |
|
810 break; |
|
811 case 3: |
|
812 mode = EVedVideoBitstreamModeMPEG4DP_RVLC; |
|
813 break; |
|
814 case 4: |
|
815 mode = EVedVideoBitstreamModeMPEG4Resyn; |
|
816 break; |
|
817 case 6: |
|
818 mode = EVedVideoBitstreamModeMPEG4Resyn_DP; |
|
819 break; |
|
820 case 7: |
|
821 mode = EVedVideoBitstreamModeMPEG4Resyn_DP_RVLC; |
|
822 break; |
|
823 default: |
|
824 break; |
|
825 } |
|
826 |
|
827 return mode; |
|
828 } |
|
829 |
|
830 // --------------------------------------------------------- |
|
831 // CVedVolReader::TimeIncrementResolution |
|
832 // Returns the time increment resolution that was read from the VOL header |
|
833 // --------------------------------------------------------- |
|
834 // |
|
835 EXPORT_C TInt CVedVolReader::TimeIncrementResolution() const |
|
836 { |
|
837 return iHeader.iTimeIncrementResolution; |
|
838 } |
|
839 |
|
840 // --------------------------------------------------------- |
|
841 // CVedVolReader::Width |
|
842 // Returns the width of the video that was read from the VOL header |
|
843 // --------------------------------------------------------- |
|
844 // |
|
845 EXPORT_C TInt CVedVolReader::Width() const |
|
846 { |
|
847 return iHeader.iLumWidth; |
|
848 } |
|
849 |
|
850 // --------------------------------------------------------- |
|
851 // CVedVolReader::Height |
|
852 // Returns the height of the video that was read from the VOL header |
|
853 // --------------------------------------------------------- |
|
854 // |
|
855 EXPORT_C TInt CVedVolReader::Height() const |
|
856 { |
|
857 return iHeader.iLumHeight; |
|
858 } |
|
859 |
|
860 // --------------------------------------------------------- |
|
861 // CVedVolReader::ProfileLevelId |
|
862 // Returns the Level Id of the Simple Profile the Video Object conforms to |
|
863 // --------------------------------------------------------- |
|
864 // |
|
865 EXPORT_C TInt CVedVolReader::ProfileLevelId() const |
|
866 { |
|
867 return iHeader.iProfileLevelId; |
|
868 } |
|
869 |
|
870 // --------------------------------------------------------- |
|
871 // CVedVolReader::BitstreamMode |
|
872 // Returns the bitstream mode of the video |
|
873 // --------------------------------------------------------- |
|
874 // |
|
875 EXPORT_C TVedVideoBitstreamMode CVedVolReader::BitstreamMode() const |
|
876 { |
|
877 return iBitstreamMode; |
|
878 } |
|
879 |
|
880 // --------------------------------------------------------- |
|
881 // CVedVolReader::HeaderSize |
|
882 // Returns the bitstream mode of the video |
|
883 // --------------------------------------------------------- |
|
884 // |
|
885 EXPORT_C TInt CVedVolReader::HeaderSize() const |
|
886 { |
|
887 return iHeaderSize; |
|
888 } |
|
889 |
|