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1 /* |
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2 * Copyright (c) 2006 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: Class definition for the AMR utility functions. |
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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 // INCLUDES |
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20 #include "AMRAudioControllerUtility.h" |
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21 #include "DebugMacros.h" |
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22 #include <mmfdatabuffer.h> |
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23 |
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24 // CONSTANTS |
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25 _LIT8(KAmrMagicNumber, "#!AMR\n"); |
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26 |
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27 // The size of AMR header, header must include bits for determining frame length |
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28 const TInt KAmrFrameHeaderSize = 1; |
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29 |
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30 // Frame length table (number of frame bytes) |
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31 const TInt KAmrFrameLength[16] = {13,14,16,18,20,21,27,32,6,0,0,0,0,0,0,1}; |
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32 |
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33 // Stuffing length table (number of stuffing bits) |
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34 //const TInt KAmrStuffLength[16] = {4, 4, 5, 5, 7, 4, 7, 7, 4,0,0,0,0,0,0,3}; |
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35 |
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36 // Maximum number of PCM samples in one AMR frame |
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37 const TInt KAmrMaxSamplesPerFrame160 = 160; |
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38 |
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39 // constant time for each frame = 0.020 sec |
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40 const TInt KAmrMilliSecondsPerFrame = 20; |
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41 |
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42 const TInt KAmrSampleRate8K = 8000; |
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43 const TInt KAmrBitRate = 12800; |
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44 const TInt KAmrChannels1 = 1; |
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45 |
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46 // ============================ MEMBER FUNCTIONS =============================== |
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47 |
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48 // ----------------------------------------------------------------------------- |
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49 // CAMRAudioControllerUtility::CAMRAudioControllerUtility |
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50 // C++ default constructor can NOT contain any code, that |
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51 // might leave. |
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52 // ----------------------------------------------------------------------------- |
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53 // |
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54 CAMRAudioControllerUtility::CAMRAudioControllerUtility() |
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55 { |
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56 iSamplingRate = KAmrSampleRate8K; |
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57 iBitRate = KAmrBitRate; |
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58 iChannels = KAmrChannels1; |
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59 iHeaderOffset = KAmrMagicNumber().Size(); // only because recorder controller needs this |
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60 iFrameTimeMs = KAmrMilliSecondsPerFrame; |
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61 iLenMetaData = 0; |
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62 iDurationUs = 0; |
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63 iTotalFrameBytes = 0; |
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64 iTotalFrames = 0; |
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65 iFrameDataOffset = 0; |
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66 } |
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67 |
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68 // ----------------------------------------------------------------------------- |
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69 // CAMRAudioControllerUtility::ConstructL |
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70 // Symbian 2nd phase constructor can leave. |
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71 // ----------------------------------------------------------------------------- |
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72 // |
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73 void CAMRAudioControllerUtility::ConstructL() |
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74 { |
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75 iPosArr = new(ELeave) CArrayFixSeg<TTimePos>(1024); |
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76 } |
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77 |
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78 // ----------------------------------------------------------------------------- |
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79 // CAMRAudioControllerUtility::NewL |
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80 // Two-phased constructor. |
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81 // ----------------------------------------------------------------------------- |
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82 // |
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83 EXPORT_C CAMRAudioControllerUtility* CAMRAudioControllerUtility::NewL() |
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84 { |
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85 DP0(_L("CAMRAudioControllerUtility::NewL")); |
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86 CAMRAudioControllerUtility* self = new(ELeave) CAMRAudioControllerUtility; |
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87 CleanupStack::PushL(self); |
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88 self->ConstructL(); |
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89 CleanupStack::Pop(self); |
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90 return self; |
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91 } |
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92 |
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93 // Destructor |
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94 EXPORT_C CAMRAudioControllerUtility::~CAMRAudioControllerUtility() |
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95 { |
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96 iPosArr->Reset(); |
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97 delete iPosArr; |
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98 } |
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99 |
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100 // ----------------------------------------------------------------------------- |
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101 // CAMRAudioControllerUtility::SeekSync |
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102 // ----------------------------------------------------------------------------- |
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103 // |
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104 TInt CAMRAudioControllerUtility::SeekSync( |
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105 CMMFDataBuffer* aBuf, |
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106 TInt aBufLen) |
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107 { |
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108 // aBufLen is still the total buffer size. |
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109 // we'll use the buffer position as the starting point of the seek for a frame |
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110 // the endPtr is the ending point of the seek |
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111 |
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112 const TUint8* buf = aBuf->Data().Ptr() + aBuf->Position(); |
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113 const TInt KMaxFrames = 3; // number of frames to check |
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114 const TInt KNotFound = aBufLen; // sync not found position |
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115 TAudioFrameInfo frameInfo; // frame parameters |
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116 TInt i = 0; |
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117 TInt syncPos = KNotFound; |
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118 TInt maxSeek = KMaxFrames; |
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119 const TUint8* endPtr = buf + aBufLen - aBuf->Position(); |
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120 |
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121 //Check if start position is same as end position |
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122 //If so, the reset the start position to the beginning of the buffer |
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123 //Bug-Id:ESLM-7ZFAHF |
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124 if (buf == endPtr) |
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125 { |
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126 buf = aBuf->Data().Ptr(); |
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127 } |
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128 |
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129 // Seek a valid frame candidate byte by byte until a valid frame |
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130 // is found or all bytes have been checked. |
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131 while (buf < endPtr && syncPos == KNotFound) |
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132 { |
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133 TInt seekCount = 0; |
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134 const TUint8* framePtr = buf; |
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135 TInt frameBufLen = aBufLen; |
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136 syncPos = i; |
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137 // Check the validity of this frame candidate and the nearest next |
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138 // frames. If they are not OK, syncPos will be set to KNotFound. |
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139 while (framePtr < endPtr && syncPos != KNotFound && seekCount < maxSeek) |
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140 { |
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141 TInt length = FrameInfo(framePtr, frameBufLen, frameInfo); |
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142 if (frameBufLen >= KAmrFrameHeaderSize && length == 0) |
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143 { |
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144 syncPos = KNotFound; |
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145 } |
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146 framePtr += length; |
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147 frameBufLen -= length; |
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148 seekCount++; |
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149 } |
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150 buf++; aBufLen--; i++; |
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151 } |
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152 return syncPos; |
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153 } |
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154 |
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155 // ----------------------------------------------------------------------------- |
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156 // CAMRAudioControllerUtility::FrameInfo |
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157 // ----------------------------------------------------------------------------- |
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158 // |
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159 TInt CAMRAudioControllerUtility::FrameInfo( |
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160 const TUint8* aBuf, |
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161 TInt aBufLen, |
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162 TAudioFrameInfo& aInfo) |
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163 { |
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164 TInt length = 0; |
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165 aInfo.iBitRate = 0; |
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166 if (aBufLen >= KAmrFrameHeaderSize) |
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167 { |
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168 // extract mode information |
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169 const TInt mode = (aBuf[0] & 0x78) >> 3; // 1st byte 0b.MODE... |
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170 // get length |
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171 length = KAmrFrameLength[mode]; |
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172 |
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173 // check start stuffing bits |
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174 if ((aBuf[0] & 0x83) != 0) |
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175 { |
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176 length = 0; // syntax error |
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177 } |
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178 |
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179 // SKIP CHECKING FOR STUFFING BITS |
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180 /* |
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181 // check end stuffing bits |
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182 if (length > 0 && aBufLen >= length) |
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183 { |
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184 TUint32 stuffBits = aBuf[length-1]; |
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185 stuffBits <<= (11 - KAmrStuffLength[mode]); |
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186 if ((stuffBits & 0x0000FF) != 0) |
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187 { |
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188 length = 0; // syntax error |
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189 } |
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190 } |
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191 */ |
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192 // update frame parameters |
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193 aInfo.iMode = mode; |
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194 aInfo.iBitRate = length * 400; |
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195 aInfo.iSamplingRate = KAmrSampleRate8K; |
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196 aInfo.iChannels = KAmrChannels1; |
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197 aInfo.iFrameSize = length; |
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198 aInfo.iFrameSamples = KAmrMaxSamplesPerFrame160; |
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199 aInfo.iSamplingRateOut = aInfo.iSamplingRate; |
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200 aInfo.iChannelsOut = aInfo.iChannels; |
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201 aInfo.iFrameSamplesOut= aInfo.iFrameSamples; |
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202 } |
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203 return length; |
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204 } |
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205 |
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206 // ----------------------------------------------------------------------------- |
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207 // CAMRAudioControllerUtility::FrameHeaderSize |
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208 // ----------------------------------------------------------------------------- |
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209 // |
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210 TInt CAMRAudioControllerUtility::FrameHeaderSize() |
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211 { |
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212 return KAmrFrameHeaderSize; |
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213 } |
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214 |
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215 |
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216 // ----------------------------------------------------------------------------- |
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217 // CAMRAudioControllerUtility::ScanHeaderL |
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218 // Used to scan the header information |
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219 // ----------------------------------------------------------------------------- |
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220 // |
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221 void CAMRAudioControllerUtility::ScanHeaderL( |
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222 CMMFDataBuffer* aDataBuf) |
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223 { |
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224 DP0(_L("CAMRAudioControllerUtility::ScanHeaderL")); |
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225 iBitRateFrozen = EFalse; // AMR does not have bitrate in container header, so it will be averaged while playing |
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226 const TUint8* bufferPtr = aDataBuf->Data().Ptr(); |
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227 TInt bufferSize = aDataBuf->Data().Size(); |
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228 |
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229 TInt scannedBuffer = 0; |
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230 TAudioFrameInfo frameInfo; |
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231 TInt frameLen; |
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232 |
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233 if (!iHdrIsRead) |
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234 { |
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235 if (iLenMetaData == 0) |
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236 { |
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237 iSyncOffset = 0; |
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238 iLenMetaData = ID3HeaderLength(aDataBuf); |
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239 } |
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240 TInt bufferRemaining = bufferSize; |
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241 |
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242 while (iLenMetaData > 0) |
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243 { |
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244 if (iLenMetaData >= bufferRemaining) |
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245 { |
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246 // this buffer contain no frame |
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247 iSyncOffset += bufferRemaining; |
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248 iLenMetaData -= bufferRemaining; |
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249 User::Leave(KErrNotReady); |
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250 } |
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251 else |
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252 { |
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253 iSyncOffset += iLenMetaData; |
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254 scannedBuffer += iLenMetaData; |
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255 // be sure to check for following id3 tags |
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256 bufferRemaining = bufferSize - scannedBuffer; |
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257 aDataBuf->SetPosition(scannedBuffer); |
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258 iLenMetaData = ID3HeaderLength(aDataBuf); |
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259 } |
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260 } |
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261 |
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262 aDataBuf->SetPosition(scannedBuffer); |
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263 // should change seeksync to start seek from position and not start of buffer (done) |
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264 // this is a little akward because of the implementation of seeksync and its use by the recoder controller. |
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265 TInt seekOffset = SeekSync(aDataBuf, bufferSize); // seeksync now scans from start of buffer + Position() |
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266 TInt realOffset = seekOffset - scannedBuffer; // we just want offset from where we were |
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267 |
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268 iHeaderOffset = 0; |
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269 if (realOffset >= 6) |
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270 { |
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271 bufferPtr = aDataBuf->Data().Ptr() + seekOffset - 6; |
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272 TUint32* w1p = (TUint32*)bufferPtr; |
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273 TUint16* w2p = (TUint16*)(bufferPtr+4); |
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274 if (((*w1p & 0x4D412123)==0x4D412123) && |
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275 ((*w2p & 0x0A52)==0x0A52)) |
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276 { |
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277 iHeaderOffset = 6; |
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278 realOffset -= 6; |
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279 } |
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280 else if (seekOffset == bufferSize) |
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281 { |
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282 User::Leave(KErrNotReady); |
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283 } |
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284 } |
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285 |
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286 iSyncOffset += realOffset; // offset to this point from content beginning |
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287 scannedBuffer += realOffset + iHeaderOffset; // offset to this point in this buffer |
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288 bufferPtr = aDataBuf->Data().Ptr(); |
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289 aDataBuf->SetPosition(scannedBuffer); |
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290 |
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291 DP0(_L("CAMRAudioControllerUtility::ScanHeaderL - Calling FrameInfo")); |
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292 |
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293 //TAudioFrameInfo frameInfo; |
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294 /*TInt*/ frameLen = FrameInfo(bufferPtr+scannedBuffer, bufferSize-scannedBuffer, frameInfo); |
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295 |
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296 if (frameLen == 0) |
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297 { |
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298 User::Leave(KErrNotReady); |
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299 } |
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300 |
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301 // scannedBuffer += frameLen; |
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302 iBitRate = 0; |
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303 iDurationUs = 0; |
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304 |
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305 iSamplingRate = frameInfo.iSamplingRate; |
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306 iBitRate = frameInfo.iBitRate; |
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307 iSamplesPerFrame = frameInfo.iFrameSamples; |
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308 iChannels = frameInfo.iChannels; |
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309 iChannelsOut = frameInfo.iChannelsOut; |
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310 // iSamplingRateOut = frameInfo.iSamplingRateOut; |
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311 |
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312 if (iSamplingRate > 0) |
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313 { |
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314 iFrameTimeMs = (iSamplesPerFrame*1000)/iSamplingRate; |
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315 } |
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316 DP0(_L("CAMRAudioControllerUtility::ScanHeaderL - setting iHdrIsRead")); |
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317 iHdrIsRead = ETrue; |
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318 } |
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319 TInt frameBytes = 0; |
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320 TInt frames = 0; |
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321 |
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322 scannedBuffer += iFrameDataOffset; |
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323 while (scannedBuffer < bufferSize) // buffersize is not a function of buffer.Position() |
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324 { |
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325 frameLen = FrameInfo(bufferPtr+scannedBuffer, bufferSize-scannedBuffer, frameInfo); |
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326 if (frameLen > 0) |
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327 { |
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328 scannedBuffer += frameLen; |
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329 frameBytes += frameLen; |
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330 frames++; |
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331 } |
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332 else |
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333 { |
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334 scannedBuffer++; // since frameLen had to be 0 to come here, go ahead to the next byte |
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335 aDataBuf->SetPosition(scannedBuffer); |
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336 TInt i = SeekSync(aDataBuf, bufferSize); // still using bufferSize as total size of buffer |
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337 scannedBuffer += i; |
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338 } |
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339 } |
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340 |
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341 iFrameDataOffset = scannedBuffer - bufferSize; |
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342 DP3(_L("scannedBuffer[%d] frameBytes[%d] iFrameDataOffset[%d]"), scannedBuffer, frameBytes, iFrameDataOffset); |
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343 |
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344 iTotalFrameBytes = iTotalFrameBytes + frameBytes; |
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345 iTotalFrames = iTotalFrames + frames; |
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346 |
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347 // We only leave if its not the last buffer. |
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348 // we will not leave with the last buffer since |
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349 // the AMR Controller has to populate other configuration |
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350 // variables. |
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351 |
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352 if(!aDataBuf->LastBuffer()) |
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353 { // keep reading data for calculation |
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354 User::Leave(KErrCompletion); // since we have read the header already |
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355 } |
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356 DP0(_L("CAMRAudioControllerUtility::ScanHeaderL - calculating bitrate")); |
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357 |
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358 iFrameDataOffset = 0; // reset for next time |
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359 TInt64 num = (TInt64)iTotalFrameBytes * TInt64(8 * 1000); |
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360 TInt64 num1 = iFrameTimeMs * iTotalFrames; |
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361 TInt64 ans = 0; |
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362 if (num1 != 0) |
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363 { |
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364 ans = num/num1; |
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365 ans = num > ((ans + 0.5)*num1) ? (ans + 1):ans; |
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366 } |
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367 iBitRate = TInt(ans); |
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368 iBitRateFrozen = ETrue; // bitrate has been calculated using the whole file, we can use this one now |
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369 DP3(_L("CAMRAudioControllerUtility::ScanHeaderL - iTotalFrameBytes[%d] iTotalFrames[%d] iBitRate[%d]"), |
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370 iTotalFrameBytes, iTotalFrames, iBitRate); |
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371 } |
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372 |
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373 // ========================== OTHER EXPORTED FUNCTIONS ========================= |
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374 |
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375 // End of File |
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376 |