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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 * Common definitions for audio. |
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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 |
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22 #ifndef __AUDCOMMON_H__ |
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23 #define __AUDCOMMON_H__ |
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24 |
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25 #include <e32std.h> |
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26 |
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27 |
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28 const TInt KErrNoAudio = -400; |
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29 /** |
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30 * Enumeration for audio file formats. |
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31 */ |
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32 enum TAudFormat |
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33 { |
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34 EAudFormatUnrecognized = 100001, // should always be the first one |
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35 EAudFormat3GPP, |
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36 EAudFormatMP4, |
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37 EAudFormatAMR, |
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38 EAudFormatAMRWB, |
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39 EAudFormatMP3, |
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40 EAudFormatAAC_ADIF, |
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41 EAudFormatAAC_ADTS, |
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42 EAudFormatWAV, |
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43 EAudFormatLast // should always be the last one |
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44 }; |
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45 |
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46 |
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47 /** |
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48 * Enumeration for audio types (that is, codecs). |
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49 */ |
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50 enum TAudType |
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51 { |
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52 EAudTypeUnrecognized = 101001, // should always be the first one |
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53 EAudNoAudio, |
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54 EAudAMR, |
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55 EAudAMRWB, |
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56 EAudMP3, |
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57 EAudAAC_MPEG2, // EAudAAC_MPEG2 not used, all EAudAAC_MPEG is now 4 |
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58 EAudAAC_MPEG4, |
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59 EAudWAV, |
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60 EAudTypeLast // should always be the last one |
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61 }; |
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62 |
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63 /* |
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64 Purpose: MPEG-4 Audio object types. |
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65 Explanation: - */ |
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66 enum TAudAACObjectType |
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67 { |
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68 EAudAACObjectTypeNone = -1, |
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69 EAudAACObjectTypeMain, |
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70 EAudAACObjectTypeLC, |
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71 EAudAACObjectTypeSSR, |
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72 EAudAACObjectTypeLTP, |
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73 EAudAACObjectTypeLast |
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74 }; |
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75 |
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76 /** |
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77 * Enumeration for audio extension types (AAC+) |
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78 */ |
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79 enum TAudExtensionType |
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80 { |
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81 EAudExtensionTypeNoExtension = 20000, |
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82 EAudExtensionTypeEnhancedAACPlus, |
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83 EAudExtensionTypeEnhancedAACPlusParametricStereo |
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84 |
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85 }; |
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86 |
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87 /** |
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88 * Constants for audio clip priorities. |
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89 */ |
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90 const TInt KAudClipPriorityHighest = 400; |
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91 const TInt KAudClipPriorityHigh = 300; |
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92 const TInt KAudClipPriorityNormal = 200; |
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93 const TInt KAudClipPriorityLow = 100; |
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94 const TInt KAudClipPriorityLowest = 0; |
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95 |
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96 |
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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 * Enumeration for channel modes |
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102 */ |
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103 enum TChannelMode |
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104 { |
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105 EAudChannelModeNotRecognized = 103001, |
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106 EAudStereo, |
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107 EAudDualChannel, |
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108 EAudSingleChannel, |
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109 EAudParametricStereoChannel |
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110 }; |
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111 |
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112 /** |
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113 * Enumeration for bitrate modes |
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114 */ |
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115 enum TBitrateMode |
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116 { |
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117 EAudBitrateModeNotRecognized = 103001, |
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118 EAudConstant, |
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119 EAudVariable |
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120 }; |
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121 |
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122 /** |
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123 * Class for storing dynamic level marks. |
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124 */ |
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125 class TAudDynamicLevelMark |
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126 { |
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127 |
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128 public: |
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129 |
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130 /** Mark time. */ |
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131 TTimeIntervalMicroSeconds iTime; |
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132 |
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133 /** Dynamic level (-63.5 ... +63.5) in dB:s |
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134 * one step represents 0.5 dB, hence values can be -127 ... +127 |
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135 */ |
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136 TInt8 iLevel; |
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137 |
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138 TAudDynamicLevelMark(TTimeIntervalMicroSeconds aTime, TInt aLevel) |
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139 { |
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140 iTime = aTime; |
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141 if ( aLevel < -127 ) |
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142 { |
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143 iLevel = -127; |
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144 } |
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145 else if (aLevel > 127 ) |
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146 { |
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147 iLevel = 127; |
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148 } |
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149 else |
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150 { |
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151 iLevel = TInt8(aLevel); |
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152 } |
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153 } |
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154 |
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155 TAudDynamicLevelMark(const TAudDynamicLevelMark& aMark) |
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156 { |
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157 iTime = aMark.iTime; |
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158 iLevel = aMark.iLevel; |
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159 } |
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160 }; |
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161 |
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162 /** |
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163 * Class for storing general properties about an audio file. |
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164 */ |
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165 class TAudFileProperties |
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166 { |
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167 |
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168 public: |
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169 |
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170 // File format |
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171 TAudFormat iFileFormat; |
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172 // Codec |
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173 TAudType iAudioType; |
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174 // Extension type |
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175 TAudExtensionType iAudioTypeExtension; |
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176 // Duration of the clip in microseconds |
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177 TTimeIntervalMicroSeconds iDuration; |
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178 // Sampling rate in Hertzes |
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179 TInt iSamplingRate; |
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180 // Bitrate in bits/s |
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181 TInt iBitrate; |
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182 // Channel mode |
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183 TChannelMode iChannelMode; |
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184 // Channel mode for extension |
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185 TChannelMode iChannelModeExtension; |
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186 // Bitrate mode (constant or variable) |
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187 TBitrateMode iBitrateMode; |
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188 // Number of bytes in a compressed frame |
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189 TInt32 iFrameLen; |
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190 // Is iFrameLen constant? |
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191 TBool iConstantFrameLength; |
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192 // Duration of decoded frame in microseconds |
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193 TTimeIntervalMicroSeconds iFrameDuration; |
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194 // Number of frames in the clip |
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195 TInt32 iFrameCount; |
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196 // TCodecMode iCodecMode; |
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197 // Number of frames in a sample (e.g. amr in mp4 has several) |
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198 TInt iNumFramesPerSample; |
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199 // Bitdepth in PCM data (usually 8, 16 or 24, only for PCM-data) |
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200 TInt iNumberOfBitsPerSample; |
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201 // Original field in MP3 fixed header |
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202 TBool iOriginal; |
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203 |
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204 // AAC object type |
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205 TAudAACObjectType iAACObjectType; |
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206 |
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207 TBool isCompatible(const TAudFileProperties /*&c2*/) const |
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208 { |
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209 |
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210 // Now that the clips can be decoded and encoded |
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211 // all the clips are "compatible" with each other |
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212 |
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213 return ETrue; |
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214 |
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215 |
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216 } |
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217 |
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218 }; |
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219 |
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220 |
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221 |
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222 #endif // __AUDCOMMON_H__ |
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223 |