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annotate src/cdrom/macosx/AudioFilePlayer.h @ 769:b8d311d90021

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Updated copyright information for 2004 (Happy New Year!)
author Sam Lantinga <slouken@libsdl.org>
date Sun, 04 Jan 2004 16:49:27 +0000
parents de1b2c3063b9
children f8d5ddc7aef1
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2004 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Library General Public License for more details.
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14
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15 You should have received a copy of the GNU Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21
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22 This file based on Apple sample code. We haven't changed the file name,
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23 so if you want to see the original search for it on apple.com/developer
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24 */
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25
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26 //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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27 // AudioFilePlayer.h
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28 //
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29 #ifndef __AudioFilePlayer_H__
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30 #define __AudioFilePlayer_H__
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31
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32 #include <CoreServices/CoreServices.h>
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33
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34 #include <AudioToolbox/AudioConverter.h>
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35 #include <AudioUnit/AudioUnit.h>
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36
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37 #include "SDL_error.h"
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38
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39 const char* AudioFilePlayerErrorStr (OSStatus error);
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40
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41 void ThrowResult (OSStatus result, const char *str);
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42
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43 #define THROW_RESULT(str) \
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44 if (result) { \
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45 ThrowResult (result, str); \
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46 }
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47
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48 typedef void (*AudioFilePlayNotifier)(void *inRefCon,
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49 OSStatus inStatus);
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50
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51 enum {
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52 kAudioFilePlayErr_FilePlayUnderrun = -10000,
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53 kAudioFilePlay_FileIsFinished = -10001,
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54 kAudioFilePlay_PlayerIsUninitialized = -10002
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55 };
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56
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57
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58 class AudioFileManager;
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59
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60 #pragma mark __________ AudioFilePlayer
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61 class AudioFilePlayer
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62 {
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63 public:
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64 AudioFilePlayer (const FSRef *inFileRef);
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65
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66 ~AudioFilePlayer();
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67
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68 void SetDestination (AudioUnit &inDestUnit,
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69 int inBusNumber);
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70
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71 void SetNotifier (AudioFilePlayNotifier inNotifier, void *inRefCon)
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72 {
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73 mNotifier = inNotifier;
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74 mRefCon = inRefCon;
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75 }
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76
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77 void SetStartFrame (int frame); // seek in the file
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78
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79 int GetCurrentFrame (); // get the current frame position
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80
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81 void SetStopFrame (int frame); // set limit in the file
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82
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83 void Connect();
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84
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85 void Disconnect();
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86
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87 void DoNotification (OSStatus inError) const;
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88
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89 bool IsConnected () const { return mConnected; }
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90
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91 UInt32 GetBusNumber () const { return mBusNumber; }
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92
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93 AudioUnit GetDestUnit () const { return mPlayUnit; }
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94
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95 AudioConverterRef GetAudioConverter() const { return mConverter; }
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96
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97 #if DEBUG
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98 void Print() const
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99 {
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100 printf ("Destination Bus:%ld\n", GetBusNumber());
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101 printf ("Is Connected:%s\n", (IsConnected() ? "true" : "false"));
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102 printf ("- - - - - - - - - - - - - - \n");
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103 }
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104 #endif
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105
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106 const AudioStreamBasicDescription& GetFileFormat() const { return mFileDescription; }
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107
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108 private:
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109 AudioUnit mPlayUnit;
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110 UInt32 mBusNumber;
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111 SInt16 mForkRefNum;
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112
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113 AudioUnitInputCallback mInputCallback;
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114
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115 AudioStreamBasicDescription mFileDescription;
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116
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117 bool mConnected;
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118
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119 AudioFileManager* mAudioFileManager;
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120 AudioConverterRef mConverter;
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121
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122 AudioFilePlayNotifier mNotifier;
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123 void* mRefCon;
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124
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125 int mStartFrame;
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126
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127 #pragma mark __________ Private_Methods
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128
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129 void OpenFile (const FSRef *inRef, SInt64& outFileSize);
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130 };
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131
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132 #pragma mark __________ AudioFileManager
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133 class AudioFileManager
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134 {
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135 public:
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136 AudioFileManager (AudioFilePlayer &inParent,
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137 SInt16 inForkRefNum,
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138 SInt64 inFileLength,
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139 UInt32 inChunkSize);
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140
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141 ~AudioFileManager();
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142
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143
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144 void Connect (AudioConverterRef inConverter)
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145 {
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146 mParentConverter = inConverter;
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147 DoConnect();
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148 }
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149
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150 // this method should NOT be called by an object of this class
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151 // as it is called by the parent's Disconnect() method
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152 void Disconnect ();
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153
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154 OSStatus Read(char *buffer, UInt32 *len);
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155
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156 const char* GetFileBuffer () { return mFileBuffer; }
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157
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158 const AudioFilePlayer& GetParent () const { return mParent; }
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159
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160 void SetPosition (SInt64 pos); // seek/rewind in the file
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161
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162 int GetByteCounter () { return mByteCounter; } // return actual bytes streamed to audio hardware
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163
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164 void SetEndOfFile (SInt64 pos); // set the "EOF" (will behave just like it reached eof)
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165
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166 protected:
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167 AudioFilePlayer& mParent;
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168 AudioConverterRef mParentConverter;
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169 SInt16 mForkRefNum;
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170 SInt64 mAudioDataOffset;
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171
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172 char* mFileBuffer;
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173
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174 int mByteCounter;
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175
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176 bool mReadFromFirstBuffer;
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177 bool mLockUnsuccessful;
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178 bool mIsEngaged;
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179
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180 int mNumTimesAskedSinceFinished;
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181
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182 public:
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183 const UInt32 mChunkSize;
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184 SInt64 mFileLength;
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185 SInt64 mReadFilePosition;
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186 bool mWriteToFirstBuffer;
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187 bool mFinishedReadingData;
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188
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189 protected:
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190 OSStatus Render (AudioBuffer &ioData);
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191
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192 OSStatus GetFileData (void** inOutData, UInt32 *inOutDataSize);
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193
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194 void DoConnect ();
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195
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196 void AfterRender ();
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197
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198 public:
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199 static OSStatus FileInputProc (void *inRefCon,
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200 AudioUnitRenderActionFlags inActionFlags,
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201 const AudioTimeStamp *inTimeStamp,
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202 UInt32 inBusNumber,
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203 AudioBuffer *ioData);
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204 static OSStatus ACInputProc (AudioConverterRef inAudioConverter,
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205 UInt32* outDataSize,
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206 void** outData,
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207 void* inUserData);
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208 };
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209
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210
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211 #endif