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annotate src/cdrom/macosx/AudioFilePlayer.h @ 4216:5b99971a27b4 SDL-1.2

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Fixed bug #698 Hans de Goede 2009-02-13 01:10:52 PST Since the new "glitch free" version of pulseaudio (used in Fedora 10 amongst others), the sound of SDL using apps (like a simple playmus call) has been crackling. While looking in to fixing this I noticed that the current pulseaudio code in SDL uses pa_simple. However pa_simple uses a thread to pump pulseaudio events and ipc, given that SDL already has its own thread for audio handling this is clearly suboptimal, leading to unnecessary context switching IPC, etc. Also pa_simple does not allow one to implement the WaitAudio() callback for SDL audiodrivers properly. Given that my work is mostly a rewrite (although some original pieces remain) I'm attaching the new .c and .h file, as that is easier to review then the huge diff. Let me know if you also want the diff. This new version has the following features: -no longer use an additional thread next to the SDL sound thread -do not crackle with glitch free audio -when used with a newer pulse, which does glitch free audio, the total latency is the same as with the alsa driver -proper WaitAudio() implementation, saving another mixlen worth of latency -adds a WaitDone() implementation This patch has been written in consultancy with Lennart Poetering (the pulseaudio author) and has been reviewed by him for correct use of the pa API.
author Sam Lantinga <slouken@libsdl.org>
date Mon, 21 Sep 2009 09:27:08 +0000
parents 386181851388
children 4c088d2b29eb
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 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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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 #if MAC_OS_X_VERSION_MAX_ALLOWED <= 1050
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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,
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54 OSStatus inStatus);
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55
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56 enum {
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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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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, AudioUnit *inDestUnit);
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70 void (*SetNotifier)(struct S_AudioFilePlayer *afp, AudioFilePlayNotifier inNotifier, void *inRefCon);
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71 void (*SetStartFrame)(struct S_AudioFilePlayer *afp, int frame); /* seek in the file */
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72 int (*GetCurrentFrame)(struct S_AudioFilePlayer *afp); /* get the current frame position */
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73 void (*SetStopFrame)(struct S_AudioFilePlayer *afp, int frame); /* set limit in the file */
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74 int (*Connect)(struct S_AudioFilePlayer *afp);
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75 void (*Disconnect)(struct S_AudioFilePlayer *afp);
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76 void (*DoNotification)(struct S_AudioFilePlayer *afp, OSStatus inError);
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77 int (*IsConnected)(struct S_AudioFilePlayer *afp);
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78 AudioUnit (*GetDestUnit)(struct S_AudioFilePlayer *afp);
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79 void (*Print)(struct S_AudioFilePlayer *afp);
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80
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81 /*private:*/
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82 AudioUnit mPlayUnit;
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83 SInt16 mForkRefNum;
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85 AURenderCallbackStruct mInputCallback;
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86
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87 AudioStreamBasicDescription mFileDescription;
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89 int mConnected;
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91 struct S_AudioFileManager* mAudioFileManager;
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93 AudioFilePlayNotifier mNotifier;
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94 void* mRefCon;
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95
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96 int mStartFrame;
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97
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98 #pragma mark __________ Private_Methods
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99
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100 int (*OpenFile)(struct S_AudioFilePlayer *afp, const FSRef *inRef, SInt64 *outFileSize);
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101 } AudioFilePlayer;
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104 AudioFilePlayer *new_AudioFilePlayer(const FSRef *inFileRef);
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105 void delete_AudioFilePlayer(AudioFilePlayer *afp);
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109 #pragma mark __________ AudioFileManager
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110 typedef struct S_AudioFileManager
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111 {
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112 /*public:*/
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113 /* this method should NOT be called by an object of this class
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114 as it is called by the parent's Disconnect() method */
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115 void (*Disconnect)(struct S_AudioFileManager *afm);
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116 int (*DoConnect)(struct S_AudioFileManager *afm);
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117 OSStatus (*Read)(struct S_AudioFileManager *afm, char *buffer, ByteCount *len);
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118 const char* (*GetFileBuffer)(struct S_AudioFileManager *afm);
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119 const AudioFilePlayer *(*GetParent)(struct S_AudioFileManager *afm);
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120 void (*SetPosition)(struct S_AudioFileManager *afm, SInt64 pos); /* seek/rewind in the file */
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121 int (*GetByteCounter)(struct S_AudioFileManager *afm); /* return actual bytes streamed to audio hardware */
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122 void (*SetEndOfFile)(struct S_AudioFileManager *afm, SInt64 pos); /* set the "EOF" (will behave just like it reached eof) */
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123
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124 /*protected:*/
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125 AudioFilePlayer* mParent;
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126 SInt16 mForkRefNum;
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127 SInt64 mAudioDataOffset;
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128
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129 char* mFileBuffer;
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130
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131 int mByteCounter;
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132
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133 int mReadFromFirstBuffer;
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134 int mLockUnsuccessful;
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135 int mIsEngaged;
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136
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137 int mNumTimesAskedSinceFinished;
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138
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139
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140 void* mTmpBuffer;
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141 UInt32 mBufferSize;
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142 UInt32 mBufferOffset;
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143 /*public:*/
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144 UInt32 mChunkSize;
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145 SInt64 mFileLength;
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146 SInt64 mReadFilePosition;
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147 int mWriteToFirstBuffer;
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148 int mFinishedReadingData;
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149
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150 /*protected:*/
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151 OSStatus (*Render)(struct S_AudioFileManager *afm, AudioBufferList *ioData);
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152 OSStatus (*GetFileData)(struct S_AudioFileManager *afm, void** inOutData, UInt32 *inOutDataSize);
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153 void (*AfterRender)(struct S_AudioFileManager *afm);
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154
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155 /*public:*/
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156 /*static*/
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157 OSStatus (*FileInputProc)(void *inRefCon,
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158 AudioUnitRenderActionFlags *ioActionFlags,
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159 const AudioTimeStamp *inTimeStamp,
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160 UInt32 inBusNumber,
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161 UInt32 inNumberFrames,
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162 AudioBufferList *ioData);
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163 } AudioFileManager;
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164
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165
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166 AudioFileManager *new_AudioFileManager (AudioFilePlayer *inParent,
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167 SInt16 inForkRefNum,
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168 SInt64 inFileLength,
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169 UInt32 inChunkSize);
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170
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171 void delete_AudioFileManager(AudioFileManager *afm);
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172
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173 #endif
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174