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1 /* |
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2 * Copyright (c) 2007 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 the License "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: Header file for EAacPlusUtil.cpp |
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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 #ifndef EAACPLUSUTIL_H |
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20 #define EAACPLUSUTIL_H |
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21 |
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22 // INCLUDES |
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23 #include <e32base.h> |
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24 |
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25 // CLASS DECLARATION |
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26 class EAacpAudioFrameInfo; |
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27 |
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28 /** |
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29 * This class implements utility functions to extract AAC frame |
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30 * information. |
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31 * |
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32 * @lib MmfEAacPlusUtil.lib |
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33 * @since 3.2 |
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34 */ |
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35 class CEAacPlusUtil : public CBase |
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36 { |
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37 public: |
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38 // CONSTANTS |
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39 enum TEAacPlusFormatType |
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40 { |
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41 EAacPlusFormatRaw=0, |
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42 EAacPlusFormatAdif=1, |
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43 EAacPlusFormatAdts=2 |
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44 }; |
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45 /** |
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46 * EAAC+ frame info struct. |
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47 * |
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48 * @lib MmfEAacPlusUtil.lib |
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49 * @since 3.2 |
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50 */ |
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51 class TEAacPlusFrameInfo |
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52 { |
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53 public: |
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54 TInt iOutFrameSize; // Size of PCM Samples generated by decoder |
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55 TInt iNoOfSamples; // Number of PCM Samples generated by decoder per frame |
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56 TInt iSamplingFrequency; // Sampling freq of AAC Code decoder |
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57 TInt iNoOfChannels; // No of output channel 1=Mono; 2=Stereo |
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58 TInt iObjectType; // MPEG Audio Object Type 2=AAC-LC; 4=AAC-LTP |
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59 TInt iOutSamplingFrequency; // Sampling Frequence for the output samples |
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60 TInt iDownSampledMode; // 0=Normal Mode; 1=Down Sampled mode |
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61 TInt iSbr; // 0=SBR not present; 1=SBR present |
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62 TInt iPs; // 0=PS not present; 1=PS present |
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63 }; |
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64 |
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65 class TEAacPlusFrameLenConfig |
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66 { |
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67 public: |
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68 TEAacPlusFormatType iFormatType; // Container type. |
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69 TInt iSamplingFrequency; // Sampling freq of AAC core decoder |
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70 TInt iObjectType; // MPEG Audio Object Type 2=AAC-LC; 4=AAC-LTP |
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71 }; |
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72 |
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73 |
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74 public: // Constructors and destructor |
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75 |
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76 /** |
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77 * Two-phased constructor. |
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78 */ |
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79 IMPORT_C static CEAacPlusUtil* NewL(); |
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80 |
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81 /** |
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82 * Destructor. |
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83 */ |
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84 IMPORT_C virtual ~CEAacPlusUtil(); |
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85 |
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86 public: // New functions |
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87 |
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88 /** |
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89 * Used to get the format type. |
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90 * @since 3.2 |
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91 * @param aBuf buffer of AAC data from start of aac content |
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92 * @param aBufLen length of aBuf |
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93 * @param TEAacPlusFormatType returned format type 0=raw; 1=ADIF; 2=ADTS |
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94 * @return status |
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95 */ |
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96 IMPORT_C TInt GetAacFormatType(const TUint8* aBuf, TInt aBufLen, TEAacPlusFormatType& aFormatType); |
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97 |
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98 /** |
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99 * Used to get the audio format information for ADIF and ADTS content. |
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100 * Data should be provided beginning with start of aac content including header. |
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101 * Enough data should follow the header to determine SBR and PS if needed. |
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102 * Can be used with mpeg data where aHdrBuf will contain the AudioSpecificConfig. Implicit SBR and PS |
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103 * will not be determined. |
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104 * @since 3.2 |
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105 * @param aHdrBuf buffer with AAC data beginning at start of aac content including ADIF or ADTS header |
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106 * @param aHdrLen length of aHdrBuf; header length is returned in this parameter |
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107 * @param aFrameInfo returns the format information |
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108 * @return status |
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109 */ |
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110 IMPORT_C TInt GetAacFrameInfo (const TUint8* aHdrBuf, TInt& aHdrLen, TEAacPlusFrameInfo& aFrameInfo); |
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111 |
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112 /** |
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113 * Used to get the audio format information for mpeg aac. |
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114 * aHdrBuf will contain the AudioSpecificConfig. aDataBuf will contain data at beginning of raw audio frames. |
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115 * Implicit SBR and PS can be determined. |
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116 * @since 3.2 |
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117 * @param aHdrBuf buffer with AudioSpecificConfig data. |
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118 * @param aHdrLen length of aHdrBuf |
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119 * @param aFrameInfo returns the format information |
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120 * @param aDataBuf buffer with raw audio frames |
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121 * @param aDataBufLen length of aDataBuf |
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122 * @return status |
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123 */ |
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124 IMPORT_C TInt GetAacFrameInfo (const TUint8* aHdrBuf, TInt& aHdrLen, TEAacPlusFrameInfo& aFrameInfo, |
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125 TUint8* aDataBuf, TInt aDataBufLen); |
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126 |
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127 /** |
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128 * Used to get the size in bytes of the frame found at the start of aBuf. |
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129 * @since 3.2 |
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130 * @param aBuf buffer with AAC data frame |
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131 * @param aBufLen length of aBuf |
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132 * @param aFrameLen returns the frame size in bytes |
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133 * @return status |
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134 */ |
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135 IMPORT_C TInt GetAacFrameLength(const TUint8* aBuf, TInt aBufLen, TInt& aFrameLen); |
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136 |
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137 /** |
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138 * Used to configure the utility with information needed to enable the apis. |
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139 * This api can be used if GetAacFrameInfo is not used to initialize the utility. |
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140 * @since 3.2 |
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141 * @param aFormatType format type |
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142 * @param aSamplingFrequency sampling frequency |
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143 * @return status |
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144 */ |
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145 IMPORT_C TInt Config(TEAacPlusFrameLenConfig& aFrameLenConfig); |
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146 |
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147 private: |
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148 |
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149 /** |
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150 * C++ default constructor. |
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151 */ |
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152 CEAacPlusUtil(); |
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153 |
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154 /** |
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155 * By default Symbian 2nd phase constructor is private. |
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156 */ |
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157 void ConstructL(); |
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158 |
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159 private: // Data |
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160 TEAacPlusFormatType iFormat; |
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161 EAacpAudioFrameInfo* iGetFrameLenParam; |
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162 TBool iInitialized; |
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163 }; |
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164 |
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165 #endif // EAACPLUSUTIL_H |
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166 |
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167 // End of File |