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annotate src/cdrom/macosx/AudioFilePlayer.h @ 2663:0caed045d01b gsoc2008_audio_resampling

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General cleanup and fixed a buffer overrun bug. It may be necessary to normalize filter gain differently or something.
author Aaron Wishnick <schnarf@gmail.com>
date Tue, 12 Aug 2008 00:24:42 +0000
parents 6359f74f3170
children 99210400e8b9
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 #include "SDL_config.h"
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26
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27 /*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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28 AudioFilePlayer.h
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29 */
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30 #ifndef __AudioFilePlayer_H__
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31 #define __AudioFilePlayer_H__
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32
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33 #include <CoreServices/CoreServices.h>
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34
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35 #include <AudioUnit/AudioUnit.h>
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36 #ifdef AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER
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37 #include <AudioUnit/AUNTComponent.h>
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38 #endif
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39
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40 #include "SDL_error.h"
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41
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42 const char *AudioFilePlayerErrorStr(OSStatus error);
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44 /*
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45 void ThrowResult (OSStatus result, const char *str);
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46
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47 #define THROW_RESULT(str) \
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48 if (result) { \
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49 ThrowResult (result, str); \
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50 }
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51 */
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52
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53 typedef void (*AudioFilePlayNotifier) (void *inRefCon, OSStatus inStatus);
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54
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55 enum
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56 {
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57 kAudioFilePlayErr_FilePlayUnderrun = -10000,
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58 kAudioFilePlay_FileIsFinished = -10001,
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59 kAudioFilePlay_PlayerIsUninitialized = -10002
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60 };
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61
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63 struct S_AudioFileManager;
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64
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65 #pragma mark __________ AudioFilePlayer
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66 typedef struct S_AudioFilePlayer
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67 {
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68 /*public:*/
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69 int (*SetDestination) (struct S_AudioFilePlayer * afp,
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70 AudioUnit * inDestUnit);
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71 void (*SetNotifier) (struct S_AudioFilePlayer * afp,
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72 AudioFilePlayNotifier inNotifier, void *inRefCon);
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73 void (*SetStartFrame) (struct S_AudioFilePlayer * afp, int frame); /* seek in the file */
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74 int (*GetCurrentFrame) (struct S_AudioFilePlayer * afp); /* get the current frame position */
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75 void (*SetStopFrame) (struct S_AudioFilePlayer * afp, int frame); /* set limit in the file */
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76 int (*Connect) (struct S_AudioFilePlayer * afp);
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77 void (*Disconnect) (struct S_AudioFilePlayer * afp);
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78 void (*DoNotification) (struct S_AudioFilePlayer * afp, OSStatus inError);
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79 int (*IsConnected) (struct S_AudioFilePlayer * afp);
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80 AudioUnit(*GetDestUnit) (struct S_AudioFilePlayer * afp);
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81 void (*Print) (struct S_AudioFilePlayer * afp);
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82
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83 /*private:*/
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84 AudioUnit mPlayUnit;
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85 SInt16 mForkRefNum;
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86
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87 AudioUnitInputCallback mInputCallback;
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88
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89 AudioStreamBasicDescription mFileDescription;
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90
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91 int mConnected;
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93 struct S_AudioFileManager *mAudioFileManager;
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94
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95 AudioFilePlayNotifier mNotifier;
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96 void *mRefCon;
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97
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98 int mStartFrame;
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99
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100 #pragma mark __________ Private_Methods
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101
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102 int (*OpenFile) (struct S_AudioFilePlayer * afp, const FSRef * inRef,
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103 SInt64 * outFileSize);
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104 } AudioFilePlayer;
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107 AudioFilePlayer *new_AudioFilePlayer(const FSRef * inFileRef);
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108 void delete_AudioFilePlayer(AudioFilePlayer * afp);
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110
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112 #pragma mark __________ AudioFileManager
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113 typedef struct S_AudioFileManager
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114 {
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115 /*public:*/
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116 /* this method should NOT be called by an object of this class
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117 as it is called by the parent's Disconnect() method */
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118 void (*Disconnect) (struct S_AudioFileManager * afm);
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119 int (*DoConnect) (struct S_AudioFileManager * afm);
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120 OSStatus(*Read) (struct S_AudioFileManager * afm, char *buffer,
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121 UInt32 * len);
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122 const char *(*GetFileBuffer) (struct S_AudioFileManager * afm);
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123 const AudioFilePlayer *(*GetParent) (struct S_AudioFileManager * afm);
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124 void (*SetPosition) (struct S_AudioFileManager * afm, SInt64 pos); /* seek/rewind in the file */
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125 int (*GetByteCounter) (struct S_AudioFileManager * afm); /* return actual bytes streamed to audio hardware */
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126 void (*SetEndOfFile) (struct S_AudioFileManager * afm, SInt64 pos); /* set the "EOF" (will behave just like it reached eof) */
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127
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128 /*protected:*/
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129 AudioFilePlayer *mParent;
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130 SInt16 mForkRefNum;
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131 SInt64 mAudioDataOffset;
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132
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133 char *mFileBuffer;
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134
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135 int mByteCounter;
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136
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137 int mReadFromFirstBuffer;
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138 int mLockUnsuccessful;
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139 int mIsEngaged;
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140
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141 int mNumTimesAskedSinceFinished;
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142
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143
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144 void *mTmpBuffer;
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145 UInt32 mBufferSize;
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146 UInt32 mBufferOffset;
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147 /*public:*/
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148 UInt32 mChunkSize;
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149 SInt64 mFileLength;
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150 SInt64 mReadFilePosition;
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151 int mWriteToFirstBuffer;
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152 int mFinishedReadingData;
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153
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154 /*protected:*/
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155 OSStatus(*Render) (struct S_AudioFileManager * afm,
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156 AudioBuffer * ioData);
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157 OSStatus(*GetFileData) (struct S_AudioFileManager * afm,
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158 void **inOutData, UInt32 * inOutDataSize);
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159 void (*AfterRender) (struct S_AudioFileManager * afm);
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160
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161 /*public:*/
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162 /*static */
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163 OSStatus(*FileInputProc) (void *inRefCon,
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164 AudioUnitRenderActionFlags inActionFlags,
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165 const AudioTimeStamp * inTimeStamp,
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166 UInt32 inBusNumber, AudioBuffer * ioData);
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167 } AudioFileManager;
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168
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169
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170 AudioFileManager *new_AudioFileManager(AudioFilePlayer * inParent,
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171 SInt16 inForkRefNum,
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172 SInt64 inFileLength,
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173 UInt32 inChunkSize);
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174
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175 void delete_AudioFileManager(AudioFileManager * afm);
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176
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177 #endif
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178 /* vi: set ts=4 sw=4 expandtab: */