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1 /* |
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2 * Copyright (c) 2002 Nokia Corporation and/or its subsidiary(-ies). |
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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 "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 * |
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14 * Description: Definition of an abstract base class for file format parsers |
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15 * |
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16 */ |
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17 |
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18 |
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19 |
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20 |
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21 #ifndef __PARSER_H__ |
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22 #define __PARSER_H__ |
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23 |
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24 // INCLUDES |
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25 #ifndef __E32BASE_H__ |
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26 #include <e32base.h> |
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27 #endif |
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28 |
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29 // CONSTANTS |
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30 // MACROS |
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31 // DATA TYPES |
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32 // FUNCTION PROTOTYPES |
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33 // FORWARD DECLARATIONS |
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34 // CLASS DECLARATION |
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35 |
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36 /** |
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37 * Base class for file format parser |
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38 * ?other_description_lines |
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39 */ |
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40 class CParser : public CBase |
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41 { |
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42 |
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43 public: // Constants |
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44 |
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45 enum TErrorCode |
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46 { |
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47 EInternalAssertionFailure = -2200, |
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48 EParserNotEnoughData = -2201, |
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49 EParserEndOfStream = -2202, |
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50 EParserBufferTooSmall = -2203, |
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51 EParserUnsupportedFormat = -2204, |
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52 EParserStreamCorrupted = -2205, |
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53 EParserFailure = -2206 |
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54 }; |
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55 |
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56 // file format |
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57 enum TFileFormat { |
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58 EFileFormatUnrecognized = 0, |
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59 EFileFormat3GP, |
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60 EFileFormatMP4 |
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61 }; |
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62 |
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63 // video format |
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64 enum TVideoFormat { |
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65 EVideoFormatNone = 0, |
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66 EVideoFormatH263Profile0Level10, |
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67 EVideoFormatH263Profile0Level45, |
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68 EVideoFormatMPEG4, |
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69 EVideoFormatAVCProfileBaseline, |
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70 EVideoFormatAVCProfileMain, |
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71 EVideoFormatAVCProfileExtended |
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72 }; |
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73 |
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74 |
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75 #ifdef __VIDEOEDIT__ |
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76 enum TProcessingMode |
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77 { |
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78 EParseOnly = 1, |
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79 EParseAndDecode, |
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80 EDecodeOnly |
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81 }; |
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82 #endif |
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83 |
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84 public: // Data structures |
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85 |
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86 // common stream parameters |
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87 struct TStreamParameters |
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88 { |
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89 TBool iHaveVideo; // is there video in the stream ? |
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90 TFileFormat iFileFormat; // file format |
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91 TVideoFormat iVideoFormat; // video format |
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92 |
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93 TUint iVideoWidth; // width of a video frame |
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94 TUint iVideoHeight; // height of a video frame |
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95 TInt64 iVideoPicturePeriodNsec; // one PCF tick period in nanoseconds |
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96 TUint iVideoIntraFrequency; // intra frame frequency in stream |
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97 |
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98 TUint iStreamLength; // stream length in milliseconds |
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99 TUint iVideoLength; |
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100 |
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101 TBool iCanSeek; // TRUE if seeking in file is possible |
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102 |
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103 TUint iStreamSize; // stream size in bytes |
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104 TUint iStreamBitrate; // stream average bitrate |
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105 |
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106 TUint iMaxPacketSize; // The maximum media packet size |
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107 TUint iLogicalChannelNumberVideo; // Logical channel number for video data |
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108 TUint iReferencePicturesNeeded; // Number of reference pictures |
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109 // the video decoder needs to store. |
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110 TUint iNumScalabilityLayers; // The number of different scalability layers used |
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111 |
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112 TReal iFrameRate; |
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113 TUint iVideoTimeScale; |
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114 |
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115 }; |
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116 |
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117 public: // New functions |
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118 |
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119 /** |
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120 * Parses the stream header. |
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121 * @param aStreamParameters Stream parameters |
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122 */ |
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123 |
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124 virtual TInt ParseHeaderL(TStreamParameters& aStreamParameters) = 0; |
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125 |
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126 /** |
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127 * Resets the parser to initial state. |
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128 * => If input stream is in a file, rewinds it. |
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129 * => If input is written to parser, all buffered bytes are flushed |
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130 * @param aStreamParameters Stream parameters |
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131 */ |
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132 virtual TInt Reset() = 0; |
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133 |
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134 /** |
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135 * Gets the number of frames in the current clip |
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136 * |
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137 * @return Number of frames |
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138 */ |
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139 inline TInt GetNumberOfFramesInClip() { return iNumberOfFrames; } |
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140 |
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141 virtual TInt GetNumberOfVideoFrames() = 0; |
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142 |
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143 // virtual TInt GetNumberOfFrames() = 0; |
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144 |
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145 /** |
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146 * Seeks to intra frame before given time |
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147 * |
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148 * @param aStartTime Time in microseconds to seek |
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149 * @param aIndex Index of the frame at aStartTime, if known. 0 otherwise |
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150 * |
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151 * @return Number of frames |
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152 */ |
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153 virtual TInt SeekOptimalIntraFrame(TTimeIntervalMicroSeconds aStartTime, TInt aIndex) = 0; |
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154 |
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155 /** |
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156 * Gets the size of video frame at given index |
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157 * |
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158 * @param aIndex Index of the frame |
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159 * |
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160 * @return Size of frame in bytes |
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161 */ |
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162 virtual TInt GetVideoFrameSize(TInt aIndex) = 0; |
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163 |
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164 /** |
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165 * Gets the timestamp of video frame at given index |
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166 * |
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167 * @param aIndex Index of the frame |
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168 * @param aTimeStamp Output: timestamp in ticks |
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169 * |
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170 * @return Timestamp in milliseconds |
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171 */ |
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172 virtual TInt GetVideoFrameStartTime(TInt aIndex, TInt* aTimeStampInTicks) = 0; |
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173 |
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174 /** |
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175 * Gets the type of video frame at given index |
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176 * |
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177 * @param aIndex Index of the frame |
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178 * |
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179 * @return Frame type: 1 = INTRA, 0 = INTER |
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180 */ |
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181 virtual TInt8 GetVideoFrameType(TInt aIndex) = 0; |
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182 |
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183 /** |
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184 * Gets the start frame index of the current clip |
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185 * |
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186 * @return Frame index |
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187 */ |
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188 inline TInt GetStartFrameIndex() { return iStartFrameIndex; } |
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189 |
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190 |
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191 public: // Data |
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192 |
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193 // stream parameters |
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194 TStreamParameters iStreamParameters; |
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195 // ETrue if parsing this clip for the first time |
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196 TBool iFirstTimeClipParsing; |
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197 // number of frames in output clip |
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198 TInt iOutputNumberOfFrames; |
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199 |
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200 protected: // Data |
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201 |
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202 // current frame number |
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203 TInt iFrameNumber; |
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204 // number of frames in current clip |
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205 TInt iNumberOfFrames; |
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206 // index of the first included frame |
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207 TInt iStartFrameIndex; |
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208 |
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209 }; |
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210 |
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211 #endif // __PARSER_H__ |
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212 |
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213 // End of File |