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1 /* |
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2 * Copyright (c) 2010 Ixonos Plc. |
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3 * All rights reserved. |
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4 * This component and the accompanying materials are made available |
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5 * under the terms of the "Eclipse Public License v1.0" |
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6 * which accompanies this distribution, and is available |
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7 * at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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8 * |
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9 * Initial Contributors: |
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10 * Nokia Corporation - Initial contribution |
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11 * |
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12 * Contributors: |
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13 * Ixonos Plc |
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14 * |
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15 * Description: |
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16 * |
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17 */ |
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18 |
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19 |
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20 |
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21 #ifndef _MP3API_ |
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22 #define _MP3API_ |
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23 |
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24 |
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25 #include "defines.h" |
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26 #include "mstream.h" |
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27 |
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28 |
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29 |
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30 |
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31 |
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32 /* |
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33 Purpose: Structure interface for MP1/2/3 transport stream. |
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34 Explanation: - */ |
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35 class TMpTransportHandle |
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36 { |
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37 public: |
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38 |
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39 TMPEG_Header header; |
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40 TMPEG_Header headerOld; |
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41 |
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42 int16 SlotTable[15]; |
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43 int16 FreeFormatSlots; /*-- Number of bytes in free format frame. */ |
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44 |
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45 int16 mainDataSlots; /*-- Payload size. */ |
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46 |
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47 BOOL ms_stereo; /* MS (Mid/Side) stereo used. */ |
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48 BOOL is_stereo; /* Intensity stereo used. */ |
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49 BOOL lsf; /* MPEG-2 LSF stream present. */ |
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50 BOOL mpeg25; /* MPEG-2.5 stream present. */ |
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51 |
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52 /*-- Transport stream to be used/in use. --*/ |
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53 SYNC_STATUS transportType; |
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54 SyncInfo syncInfo; |
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55 |
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56 /*-- Exec state when seeking next MPx frame. --*/ |
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57 int16 offsetBits; |
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58 ExecState execState; |
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59 |
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60 /*-- CRC codeword. --*/ |
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61 TCRC_Check crc; |
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62 |
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63 /*-- Average number of bytes reserved for each frame. --*/ |
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64 int32 aveFrameLen; |
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65 |
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66 }; |
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67 |
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68 |
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69 /** |
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70 * Data structure for mp3 frame search. |
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71 */ |
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72 class TMpFrameState |
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73 { |
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74 public: |
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75 /** |
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76 * Number of read bytes when searching start of frame. |
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77 * This value is within the input buffer and also the header |
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78 * is read after start of frame has been found. |
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79 */ |
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80 int16 readBytes; |
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81 |
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82 /** |
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83 * Number of header bytes present for current MP3 frame. |
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84 */ |
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85 int16 headerBytes; |
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86 |
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87 /** |
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88 * Number of payload bytes for current MP3 frame. The total frame |
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89 * size is 'headerBytes' + 'frameBytes'. |
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90 */ |
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91 int16 frameBytes; |
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92 |
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93 /** |
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94 * Total number of bytes read when searching the start of frame. |
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95 */ |
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96 int32 totalReadBytes; |
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97 |
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98 }; |
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99 |
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100 |
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101 |
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102 |
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103 /* |
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104 Purpose: Parameters of core engine. |
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105 Explanation: - */ |
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106 class CMPAudDec : public CBase |
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107 { |
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108 public: |
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109 |
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110 IMPORT_C static CMPAudDec* NewL(); |
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111 IMPORT_C ~CMPAudDec(); |
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112 IMPORT_C void Init(TMpTransportHandle *aMpFileFormat); |
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113 |
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114 /*-- Common to all layers. --*/ |
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115 uint8 *bitReserv; |
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116 TMPEG_Frame *frame; |
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117 |
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118 /*-- Layer III specific parameters. --*/ |
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119 TBitStream br; |
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120 CHuffman *huffman; |
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121 CIII_Side_Info *side_info; |
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122 |
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123 int16 PrevSlots; |
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124 //int32 FrameStart; |
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125 BOOL SkipBr; |
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126 BOOL WasSeeking; |
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127 |
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128 /*-- Transport handle. --*/ |
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129 TMpTransportHandle *mpFileFormat; |
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130 |
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131 |
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132 private: |
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133 |
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134 CMPAudDec(); |
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135 void ConstructL(); |
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136 |
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137 }; |
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138 |
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139 class CMp3Edit : public CBase |
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140 { |
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141 |
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142 public: |
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143 |
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144 IMPORT_C static CMp3Edit* NewL(); |
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145 IMPORT_C ~CMp3Edit(); |
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146 |
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147 IMPORT_C uint32 |
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148 FileLengthInMs(TMpTransportHandle *tHandle, int32 fileSize) const; |
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149 |
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150 IMPORT_C int32 |
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151 GetSeekOffset(TMpTransportHandle *tHandle, int32 seekPos) const; |
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152 |
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153 IMPORT_C int32 |
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154 GetFrameTime(TMpTransportHandle *tHandle) const; |
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155 |
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156 IMPORT_C void |
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157 InitTransport(TMpTransportHandle *tHandle) const; |
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158 |
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159 IMPORT_C int16 |
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160 SeekSync(TMpTransportHandle *tHandle, uint8 *syncBuf, |
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161 uint32 syncBufLen, int16 *readBytes, |
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162 int16 *frameBytes, int16 *headerBytes, |
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163 uint8 initMode) const; |
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164 |
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165 IMPORT_C int16 |
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166 FreeMode(TMpTransportHandle *tHandle, uint8 *syncBuf, |
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167 uint32 syncBufLen, int16 *readBytes, |
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168 int16 *frameBytes, int16 *headerBytes) const; |
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169 |
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170 IMPORT_C int16 |
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171 EstimateBitrate(TMpTransportHandle *tHandle, uint8 isVbr) const; |
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172 |
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173 |
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174 |
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175 |
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176 /*-- Closes MPEG Layer I/II/III decoder handle. --*/ |
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177 IMPORT_C CMPAudDec * |
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178 DeleteMPAudDec(CMPAudDec *mpAud); |
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179 |
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180 /*-- Creates MPEG Layer I/II/III decoder handle. --*/ |
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181 IMPORT_C CMPAudDec * |
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182 CreateMPAudDec(void); |
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183 |
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184 /*-- Initializes MPEG Layer I/II/III decoder handle. --*/ |
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185 IMPORT_C void |
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186 InitMPAudDec(CMPAudDec *mpAud, TMpTransportHandle *mpFileFormat); |
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187 |
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188 /*-- Resets MPEG Layer I/II/III decoder handle. --*/ |
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189 IMPORT_C void |
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190 ResetMPAudDec(CMPAudDec *mpAud); |
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191 |
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192 /*-- Stores global gain values. --*/ |
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193 IMPORT_C void |
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194 SetMPGlobalGains(TBitStream *bs, uint8 numGains, uint8 *globalGain, uint32 *gainPos); |
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195 |
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196 /*-- Extracts global gain values. --*/ |
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197 IMPORT_C uint8 |
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198 GetMPGlobalGains(TBitStream *bs, TMpTransportHandle *tHandle, uint8 *globalGain, uint32 *gainPos); |
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199 |
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200 private: |
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201 |
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202 void ConstructL(); |
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203 CMp3Edit(); |
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204 |
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205 }; |
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206 |
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207 |
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208 #endif |