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annotate src/cdrom/macosx/AudioFileReaderThread.cpp @ 768:de1b2c3063b9

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Max has been reworking this code so it works on MacOS X 10.1
author Sam Lantinga <slouken@libsdl.org>
date Sun, 04 Jan 2004 16:20:28 +0000
parents 9c6717a1c66f
children da0a2ad35bf4
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, 1998, 1999, 2000, 2001, 2002 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 // AudioFileManager.cpp
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28 //
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29 #include "AudioFilePlayer.h"
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30 #include <mach/mach.h> //used for setting policy of thread
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31 #include "CAGuard.h"
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32 #include <pthread.h>
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33
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34 #include <list>
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35
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36 class FileReaderThread {
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37 public:
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38 FileReaderThread ();
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39
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40 CAGuard& GetGuard() { return mGuard; }
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41
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42 void AddReader();
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43
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44 void RemoveReader (AudioFileManager* inItem);
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45
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46 // returns true if succeeded
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47 bool TryNextRead (AudioFileManager* inItem)
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48 {
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49 bool didLock = false;
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50 bool succeeded = false;
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51 if (mGuard.Try (didLock))
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52 {
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53 mFileData.push_back (inItem);
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54 mGuard.Notify();
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55 succeeded = true;
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56
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57 if (didLock)
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58 mGuard.Unlock();
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59 }
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60
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61 return succeeded;
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62 }
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63
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64 int mThreadShouldDie;
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65
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66 private:
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67 typedef std::list<AudioFileManager*> FileData;
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68
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69 CAGuard mGuard;
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70 UInt32 mThreadPriority;
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71
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72 int mNumReaders;
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73 FileData mFileData;
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74
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75
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76 void ReadNextChunk ();
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77
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78 void StartFixedPriorityThread ();
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79 static UInt32 GetThreadBasePriority (pthread_t inThread);
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80
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81 static void* DiskReaderEntry (void *inRefCon);
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82 };
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83
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84 FileReaderThread::FileReaderThread ()
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85 : mThreadPriority (62),
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86 mNumReaders (0)
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87 {
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88 }
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89
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90 void FileReaderThread::AddReader()
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91 {
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92 if (mNumReaders == 0)
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93 {
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94 mThreadShouldDie = false;
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95
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96 StartFixedPriorityThread ();
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97 }
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98 mNumReaders++;
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99 }
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100
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101 void FileReaderThread::RemoveReader (AudioFileManager* inItem)
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102 {
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103 if (mNumReaders > 0)
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104 {
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105 CAGuard::Locker fileReadLock (mGuard);
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106
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107 mFileData.remove (inItem);
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108
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109 if (--mNumReaders == 0) {
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110 mThreadShouldDie = true;
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111 mGuard.Notify(); // wake up thread so it will quit
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112 mGuard.Wait(); // wait for thread to die
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113 }
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114 }
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115 }
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116
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117 void FileReaderThread::StartFixedPriorityThread ()
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118 {
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119 pthread_attr_t theThreadAttrs;
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120 pthread_t pThread;
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121
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122 OSStatus result = pthread_attr_init(&theThreadAttrs);
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123 THROW_RESULT("pthread_attr_init - Thread attributes could not be created.")
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124
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125 result = pthread_attr_setdetachstate(&theThreadAttrs, PTHREAD_CREATE_DETACHED);
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126 THROW_RESULT("pthread_attr_setdetachstate - Thread attributes could not be detached.")
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127
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128 result = pthread_create (&pThread, &theThreadAttrs, DiskReaderEntry, this);
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129 THROW_RESULT("pthread_create - Create and start the thread.")
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130
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131 pthread_attr_destroy(&theThreadAttrs);
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132
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133 // we've now created the thread and started it
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134 // we'll now set the priority of the thread to the nominated priority
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135 // and we'll also make the thread fixed
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136 thread_extended_policy_data_t theFixedPolicy;
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137 thread_precedence_policy_data_t thePrecedencePolicy;
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138 SInt32 relativePriority;
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139
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140 // make thread fixed
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141 theFixedPolicy.timeshare = false; // set to true for a non-fixed thread
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142 result = thread_policy_set (pthread_mach_thread_np(pThread), THREAD_EXTENDED_POLICY, (thread_policy_t)&theFixedPolicy, THREAD_EXTENDED_POLICY_COUNT);
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143 THROW_RESULT("thread_policy - Couldn't set thread as fixed priority.")
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144 // set priority
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145 // precedency policy's "importance" value is relative to spawning thread's priority
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146 relativePriority = mThreadPriority - FileReaderThread::GetThreadBasePriority (pthread_self());
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147
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148 thePrecedencePolicy.importance = relativePriority;
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149 result = thread_policy_set (pthread_mach_thread_np(pThread), THREAD_PRECEDENCE_POLICY, (thread_policy_t)&thePrecedencePolicy, THREAD_PRECEDENCE_POLICY_COUNT);
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150 THROW_RESULT("thread_policy - Couldn't set thread priority.")
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151 }
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152
768
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153 UInt32 FileReaderThread::GetThreadBasePriority (pthread_t inThread)
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154 {
768
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155 thread_basic_info_data_t threadInfo;
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156 policy_info_data_t thePolicyInfo;
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157 unsigned int count;
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158
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159 // get basic info
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160 count = THREAD_BASIC_INFO_COUNT;
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161 thread_info (pthread_mach_thread_np (inThread), THREAD_BASIC_INFO, (integer_t*)&threadInfo, &count);
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162
768
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163 switch (threadInfo.policy) {
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164 case POLICY_TIMESHARE:
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165 count = POLICY_TIMESHARE_INFO_COUNT;
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166 thread_info(pthread_mach_thread_np (inThread), THREAD_SCHED_TIMESHARE_INFO, (integer_t*)&(thePolicyInfo.ts), &count);
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167 return thePolicyInfo.ts.base_priority;
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168 break;
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169
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170 case POLICY_FIFO:
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171 count = POLICY_FIFO_INFO_COUNT;
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172 thread_info(pthread_mach_thread_np (inThread), THREAD_SCHED_FIFO_INFO, (integer_t*)&(thePolicyInfo.fifo), &count);
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173 if (thePolicyInfo.fifo.depressed) {
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174 return thePolicyInfo.fifo.depress_priority;
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175 } else {
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176 return thePolicyInfo.fifo.base_priority;
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177 }
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178 break;
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179
768
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180 case POLICY_RR:
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181 count = POLICY_RR_INFO_COUNT;
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182 thread_info(pthread_mach_thread_np (inThread), THREAD_SCHED_RR_INFO, (integer_t*)&(thePolicyInfo.rr), &count);
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183 if (thePolicyInfo.rr.depressed) {
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184 return thePolicyInfo.rr.depress_priority;
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185 } else {
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186 return thePolicyInfo.rr.base_priority;
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187 }
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188 break;
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189 }
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190
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191 return 0;
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192 }
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193
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194 void *FileReaderThread::DiskReaderEntry (void *inRefCon)
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195 {
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196 FileReaderThread *This = (FileReaderThread *)inRefCon;
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197 This->ReadNextChunk();
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198 #if DEBUG
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199 printf ("finished with reading file\n");
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200 #endif
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201
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202 return 0;
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203 }
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204
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205 void FileReaderThread::ReadNextChunk ()
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206 {
768
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207 OSStatus result;
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208 UInt32 dataChunkSize;
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209 AudioFileManager* theItem = 0;
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210
768
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211 for (;;)
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212 {
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213 { // this is a scoped based lock
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214 CAGuard::Locker fileReadLock (mGuard);
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215
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216 if (this->mThreadShouldDie) {
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217
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218 mGuard.Notify();
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219 return;
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220 }
768
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221
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222 if (mFileData.empty())
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223 {
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224 mGuard.Wait();
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225 }
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226
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227 // kill thread
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228 if (this->mThreadShouldDie) {
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229
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230 mGuard.Notify();
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231 return;
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232 }
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233
768
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234 theItem = mFileData.front();
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235 mFileData.pop_front();
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236 }
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237
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238 if ((theItem->mFileLength - theItem->mReadFilePosition) < theItem->mChunkSize)
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239 dataChunkSize = theItem->mFileLength - theItem->mReadFilePosition;
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240 else
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241 dataChunkSize = theItem->mChunkSize;
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242
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243 // this is the exit condition for the thread
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244 if (dataChunkSize == 0) {
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245 theItem->mFinishedReadingData = true;
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246 continue;
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247 }
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248 // construct pointer
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249 char* writePtr = const_cast<char*>(theItem->GetFileBuffer() +
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250 (theItem->mWriteToFirstBuffer ? 0 : theItem->mChunkSize));
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251
613
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252 /*
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253 printf ("AudioFileReadBytes: theItem=%.8X fileID=%.8X pos=%.8X sz=%.8X flen=%.8X ptr=%.8X\n",
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254 (unsigned int)theItem, (unsigned int)theItem->GetFileID(),
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255 (unsigned int)theItem->mReadFilePosition, (unsigned int)dataChunkSize,
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256 (unsigned int)theItem->mFileLength, (unsigned int)writePtr);
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257 */
768
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258 result = theItem->Read(writePtr, &dataChunkSize);
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259 if (result) {
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260 theItem->GetParent().DoNotification(result);
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261 continue;
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262 }
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263
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264 if (dataChunkSize != theItem->mChunkSize)
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265 {
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266 writePtr += dataChunkSize;
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267
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268 // can't exit yet.. we still have to pass the partial buffer back
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269 memset (writePtr, 0, (theItem->mChunkSize - dataChunkSize));
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270 }
768
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271
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272 theItem->mWriteToFirstBuffer = !theItem->mWriteToFirstBuffer; // switch buffers
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273
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274 theItem->mReadFilePosition += dataChunkSize; // increment count
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275 }
613
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276 }
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277
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278
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279 static FileReaderThread sReaderThread;
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280
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281 AudioFileManager::AudioFileManager (AudioFilePlayer &inParent,
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282 SInt16 inForkRefNum,
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283 SInt64 inFileLength,
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284 UInt32 inChunkSize)
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285 : mParent (inParent),
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286 mForkRefNum (inForkRefNum),
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287 mFileBuffer (0),
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288 mByteCounter (0),
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289 mLockUnsuccessful (false),
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290 mIsEngaged (false),
613
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291
768
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292 mChunkSize (inChunkSize),
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293 mFileLength (inFileLength),
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294 mReadFilePosition (0),
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295 mWriteToFirstBuffer (false),
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296 mFinishedReadingData (false)
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297
613
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298 {
768
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299 mFileBuffer = (char*) malloc (mChunkSize * 2);
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300 FSGetForkPosition(mForkRefNum, &mAudioDataOffset);
613
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301 assert (mFileBuffer != NULL);
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302 }
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303
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304 void AudioFileManager::DoConnect ()
613
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305 {
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306 if (!mIsEngaged)
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307 {
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308 //mReadFilePosition = 0;
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309 mFinishedReadingData = false;
613
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310
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311 mNumTimesAskedSinceFinished = -1;
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312 mLockUnsuccessful = false;
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313
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314 OSStatus result;
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315 UInt32 dataChunkSize;
613
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316
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317 if ((mFileLength - mReadFilePosition) < mChunkSize)
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318 dataChunkSize = mFileLength - mReadFilePosition;
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319 else
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320 dataChunkSize = mChunkSize;
613
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321
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322 result = Read(mFileBuffer, &dataChunkSize);
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323 THROW_RESULT("AudioFileManager::DoConnect(): Read")
613
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324
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325 mReadFilePosition += dataChunkSize;
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326
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327 mWriteToFirstBuffer = false;
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328 mReadFromFirstBuffer = true;
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329
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330 sReaderThread.AddReader();
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331
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332 mIsEngaged = true;
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333 }
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334 else
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335 throw static_cast<OSStatus>(-1); //thread has already been started
613
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336 }
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337
768
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338 void AudioFileManager::Disconnect ()
613
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339 {
768
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340 if (mIsEngaged)
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341 {
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342 sReaderThread.RemoveReader (this);
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343 mIsEngaged = false;
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344 }
613
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345 }
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346
768
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diff changeset
347 OSStatus AudioFileManager::Read(char *buffer, UInt32 *len)
613
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348 {
768
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diff changeset
349 return FSReadFork (mForkRefNum,
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diff changeset
350 fsFromStart,
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diff changeset
351 mReadFilePosition + mAudioDataOffset,
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diff changeset
352 *len,
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diff changeset
353 buffer,
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diff changeset
354 len);
613
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355 }
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356
768
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diff changeset
357 OSStatus AudioFileManager::GetFileData (void** inOutData, UInt32 *inOutDataSize)
613
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358 {
768
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diff changeset
359 if (mFinishedReadingData)
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360 {
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diff changeset
361 ++mNumTimesAskedSinceFinished;
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diff changeset
362 *inOutDataSize = 0;
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diff changeset
363 *inOutData = 0;
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diff changeset
364 return noErr;
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diff changeset
365 }
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diff changeset
366
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diff changeset
367 if (mReadFromFirstBuffer == mWriteToFirstBuffer) {
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diff changeset
368 #if DEBUG
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diff changeset
369 printf ("* * * * * * * Can't keep up with reading file:%ld\n", mParent.GetBusNumber());
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diff changeset
370 #endif
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diff changeset
371
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diff changeset
372 mParent.DoNotification (kAudioFilePlayErr_FilePlayUnderrun);
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diff changeset
373 *inOutDataSize = 0;
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374 *inOutData = 0;
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diff changeset
375 } else {
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diff changeset
376 *inOutDataSize = mChunkSize;
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diff changeset
377 *inOutData = mReadFromFirstBuffer ? mFileBuffer : (mFileBuffer + mChunkSize);
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diff changeset
378 }
613
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parents:
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379
768
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380 mLockUnsuccessful = !sReaderThread.TryNextRead (this);
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381
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382 mReadFromFirstBuffer = !mReadFromFirstBuffer;
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383
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384 return noErr;
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385 }
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386
768
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387 void AudioFileManager::AfterRender ()
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388 {
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389 if (mNumTimesAskedSinceFinished > 0)
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390 {
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391 bool didLock = false;
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392 if (sReaderThread.GetGuard().Try (didLock)) {
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393 mParent.DoNotification (kAudioFilePlay_FileIsFinished);
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394 if (didLock)
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395 sReaderThread.GetGuard().Unlock();
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396 }
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397 }
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398
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399 if (mLockUnsuccessful)
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400 mLockUnsuccessful = !sReaderThread.TryNextRead (this);
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401 }
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402
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403 void AudioFileManager::SetPosition (SInt64 pos)
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404 {
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405 if (pos < 0 || pos >= mFileLength) {
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406 SDL_SetError ("AudioFileManager::SetPosition - position invalid: %d filelen=%d\n",
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407 (unsigned int)pos, (unsigned int)mFileLength);
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408 pos = 0;
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409 }
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410
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411 mReadFilePosition = pos;
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412 }
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413
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414 void AudioFileManager::SetEndOfFile (SInt64 pos)
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415 {
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416 if (pos <= 0 || pos > mFileLength) {
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417 SDL_SetError ("AudioFileManager::SetEndOfFile - position beyond actual eof\n");
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418 pos = mFileLength;
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419 }
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420
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421 mFileLength = pos;
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422 }