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annotate src/cdrom/macosx/AudioFileReaderThread.cpp @ 1029:f87f87efd45a

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Date: Mon, 17 Jan 2005 20:54:50 +0200 From: Ville [snip] Subject: [PATCH] SDL/DirectFB: remove Matrox CRTC2 flicker filter Hi, This patch removes the flicker filter option from the DirectFB backend's Matrox CRTC2 code in SDL. I will be removing the option from DirectFB (because it doesn't actually work) and that would cause the SDL code to fail without this fix. I was going to send this to some SDL list directly but libsdl.org is down so I'm not sure what if any lists there are. Thomas Jarosch (the guy who wrote the code) said you would accept SDL patches. Let me know if I should send this somewhere else. -- Ville Syrj�l� syrjala _at sci.fi http://www.sci.fi/~syrjala/
author Ryan C. Gordon <icculus@icculus.org>
date Mon, 17 Jan 2005 19:38:28 +0000
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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
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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
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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
768
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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
773
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244 if (dataChunkSize <= 0) {
768
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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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diff changeset
250 (theItem->mWriteToFirstBuffer ? 0 : theItem->mChunkSize));
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parents: 613
diff changeset
251
773
da0a2ad35bf4 Date: Sun, 4 Jan 2004 23:48:19 +0100
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parents: 768
diff changeset
252 // read data
768
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parents: 613
diff changeset
253 result = theItem->Read(writePtr, &dataChunkSize);
773
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parents: 768
diff changeset
254 if (result != noErr && result != eofErr) {
768
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parents: 613
diff changeset
255 theItem->GetParent().DoNotification(result);
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parents: 613
diff changeset
256 continue;
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parents: 613
diff changeset
257 }
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parents: 613
diff changeset
258
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parents: 613
diff changeset
259 if (dataChunkSize != theItem->mChunkSize)
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parents: 613
diff changeset
260 {
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parents: 613
diff changeset
261 writePtr += dataChunkSize;
613
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parents:
diff changeset
262
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
263 // can't exit yet.. we still have to pass the partial buffer back
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
264 memset (writePtr, 0, (theItem->mChunkSize - dataChunkSize));
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
265 }
768
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parents: 613
diff changeset
266
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diff changeset
267 theItem->mWriteToFirstBuffer = !theItem->mWriteToFirstBuffer; // switch buffers
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parents: 613
diff changeset
268
773
da0a2ad35bf4 Date: Sun, 4 Jan 2004 23:48:19 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 768
diff changeset
269 if (result == eofErr)
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parents: 768
diff changeset
270 theItem->mReadFilePosition = theItem->mFileLength;
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parents: 768
diff changeset
271 else
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parents: 768
diff changeset
272 theItem->mReadFilePosition += dataChunkSize; // increment count
768
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parents: 613
diff changeset
273 }
613
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
274 }
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
275
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
276
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
277 static FileReaderThread sReaderThread;
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parents:
diff changeset
278
768
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parents: 613
diff changeset
279 AudioFileManager::AudioFileManager (AudioFilePlayer &inParent,
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parents: 613
diff changeset
280 SInt16 inForkRefNum,
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diff changeset
281 SInt64 inFileLength,
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parents: 613
diff changeset
282 UInt32 inChunkSize)
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diff changeset
283 : mParent (inParent),
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diff changeset
284 mForkRefNum (inForkRefNum),
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parents: 613
diff changeset
285 mFileBuffer (0),
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Sam Lantinga <slouken@libsdl.org>
parents: 613
diff changeset
286 mByteCounter (0),
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diff changeset
287 mLockUnsuccessful (false),
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
288 mIsEngaged (false),
613
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
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parents:
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289
935
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents: 775
diff changeset
290 mBufferSize (inChunkSize),
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents: 775
diff changeset
291 mBufferOffset (inChunkSize),
768
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parents: 613
diff changeset
292 mChunkSize (inChunkSize),
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Sam Lantinga <slouken@libsdl.org>
parents: 613
diff changeset
293 mFileLength (inFileLength),
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Sam Lantinga <slouken@libsdl.org>
parents: 613
diff changeset
294 mReadFilePosition (0),
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parents: 613
diff changeset
295 mWriteToFirstBuffer (false),
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Sam Lantinga <slouken@libsdl.org>
parents: 613
diff changeset
296 mFinishedReadingData (false)
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Sam Lantinga <slouken@libsdl.org>
parents: 613
diff changeset
297
613
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
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parents:
diff changeset
298 {
768
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diff changeset
299 mFileBuffer = (char*) malloc (mChunkSize * 2);
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diff changeset
300 FSGetForkPosition(mForkRefNum, &mAudioDataOffset);
613
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parents:
diff changeset
301 assert (mFileBuffer != NULL);
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
302 }
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
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parents:
diff changeset
303
768
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diff changeset
304 void AudioFileManager::DoConnect ()
613
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parents:
diff changeset
305 {
768
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diff changeset
306 if (!mIsEngaged)
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parents: 613
diff changeset
307 {
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diff changeset
308 //mReadFilePosition = 0;
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diff changeset
309 mFinishedReadingData = false;
613
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parents:
diff changeset
310
775
08b7fc2b5225 Fixed playback problems with MacOSX 10.1
Sam Lantinga <slouken@libsdl.org>
parents: 773
diff changeset
311 mNumTimesAskedSinceFinished = 0;
768
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Sam Lantinga <slouken@libsdl.org>
parents: 613
diff changeset
312 mLockUnsuccessful = false;
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Sam Lantinga <slouken@libsdl.org>
parents: 613
diff changeset
313
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parents: 613
diff changeset
314 OSStatus result;
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Sam Lantinga <slouken@libsdl.org>
parents: 613
diff changeset
315 UInt32 dataChunkSize;
613
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
316
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
317 if ((mFileLength - mReadFilePosition) < mChunkSize)
768
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parents: 613
diff changeset
318 dataChunkSize = mFileLength - mReadFilePosition;
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parents: 613
diff changeset
319 else
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parents: 613
diff changeset
320 dataChunkSize = mChunkSize;
613
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
321
768
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parents: 613
diff changeset
322 result = Read(mFileBuffer, &dataChunkSize);
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Sam Lantinga <slouken@libsdl.org>
parents: 613
diff changeset
323 THROW_RESULT("AudioFileManager::DoConnect(): Read")
613
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
324
768
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diff changeset
325 mReadFilePosition += dataChunkSize;
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parents: 613
diff changeset
326
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diff changeset
327 mWriteToFirstBuffer = false;
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parents: 613
diff changeset
328 mReadFromFirstBuffer = true;
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Sam Lantinga <slouken@libsdl.org>
parents: 613
diff changeset
329
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Sam Lantinga <slouken@libsdl.org>
parents: 613
diff changeset
330 sReaderThread.AddReader();
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Sam Lantinga <slouken@libsdl.org>
parents: 613
diff changeset
331
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parents: 613
diff changeset
332 mIsEngaged = true;
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Sam Lantinga <slouken@libsdl.org>
parents: 613
diff changeset
333 }
de1b2c3063b9 Max has been reworking this code so it works on MacOS X 10.1
Sam Lantinga <slouken@libsdl.org>
parents: 613
diff changeset
334 else
de1b2c3063b9 Max has been reworking this code so it works on MacOS X 10.1
Sam Lantinga <slouken@libsdl.org>
parents: 613
diff changeset
335 throw static_cast<OSStatus>(-1); //thread has already been started
613
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
336 }
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
337
768
de1b2c3063b9 Max has been reworking this code so it works on MacOS X 10.1
Sam Lantinga <slouken@libsdl.org>
parents: 613
diff changeset
338 void AudioFileManager::Disconnect ()
613
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
339 {
768
de1b2c3063b9 Max has been reworking this code so it works on MacOS X 10.1
Sam Lantinga <slouken@libsdl.org>
parents: 613
diff changeset
340 if (mIsEngaged)
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Sam Lantinga <slouken@libsdl.org>
parents: 613
diff changeset
341 {
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Sam Lantinga <slouken@libsdl.org>
parents: 613
diff changeset
342 sReaderThread.RemoveReader (this);
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Sam Lantinga <slouken@libsdl.org>
parents: 613
diff changeset
343 mIsEngaged = false;
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Sam Lantinga <slouken@libsdl.org>
parents: 613
diff changeset
344 }
613
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
345 }
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
346
768
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Sam Lantinga <slouken@libsdl.org>
parents: 613
diff changeset
347 OSStatus AudioFileManager::Read(char *buffer, UInt32 *len)
613
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
348 {
768
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parents: 613
diff changeset
349 return FSReadFork (mForkRefNum,
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Sam Lantinga <slouken@libsdl.org>
parents: 613
diff changeset
350 fsFromStart,
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Sam Lantinga <slouken@libsdl.org>
parents: 613
diff changeset
351 mReadFilePosition + mAudioDataOffset,
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Sam Lantinga <slouken@libsdl.org>
parents: 613
diff changeset
352 *len,
de1b2c3063b9 Max has been reworking this code so it works on MacOS X 10.1
Sam Lantinga <slouken@libsdl.org>
parents: 613
diff changeset
353 buffer,
de1b2c3063b9 Max has been reworking this code so it works on MacOS X 10.1
Sam Lantinga <slouken@libsdl.org>
parents: 613
diff changeset
354 len);
613
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
355 }
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
356
768
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Sam Lantinga <slouken@libsdl.org>
parents: 613
diff changeset
357 OSStatus AudioFileManager::GetFileData (void** inOutData, UInt32 *inOutDataSize)
613
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
358 {
768
de1b2c3063b9 Max has been reworking this code so it works on MacOS X 10.1
Sam Lantinga <slouken@libsdl.org>
parents: 613
diff changeset
359 if (mFinishedReadingData)
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Sam Lantinga <slouken@libsdl.org>
parents: 613
diff changeset
360 {
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Sam Lantinga <slouken@libsdl.org>
parents: 613
diff changeset
361 ++mNumTimesAskedSinceFinished;
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Sam Lantinga <slouken@libsdl.org>
parents: 613
diff changeset
362 *inOutDataSize = 0;
de1b2c3063b9 Max has been reworking this code so it works on MacOS X 10.1
Sam Lantinga <slouken@libsdl.org>
parents: 613
diff changeset
363 *inOutData = 0;
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Sam Lantinga <slouken@libsdl.org>
parents: 613
diff changeset
364 return noErr;
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Sam Lantinga <slouken@libsdl.org>
parents: 613
diff changeset
365 }
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Sam Lantinga <slouken@libsdl.org>
parents: 613
diff changeset
366
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Sam Lantinga <slouken@libsdl.org>
parents: 613
diff changeset
367 if (mReadFromFirstBuffer == mWriteToFirstBuffer) {
de1b2c3063b9 Max has been reworking this code so it works on MacOS X 10.1
Sam Lantinga <slouken@libsdl.org>
parents: 613
diff changeset
368 #if DEBUG
935
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents: 775
diff changeset
369 printf ("* * * * * * * Can't keep up with reading file\n");
768
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Sam Lantinga <slouken@libsdl.org>
parents: 613
diff changeset
370 #endif
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Sam Lantinga <slouken@libsdl.org>
parents: 613
diff changeset
371
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Sam Lantinga <slouken@libsdl.org>
parents: 613
diff changeset
372 mParent.DoNotification (kAudioFilePlayErr_FilePlayUnderrun);
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Sam Lantinga <slouken@libsdl.org>
parents: 613
diff changeset
373 *inOutDataSize = 0;
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Sam Lantinga <slouken@libsdl.org>
parents: 613
diff changeset
374 *inOutData = 0;
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Sam Lantinga <slouken@libsdl.org>
parents: 613
diff changeset
375 } else {
de1b2c3063b9 Max has been reworking this code so it works on MacOS X 10.1
Sam Lantinga <slouken@libsdl.org>
parents: 613
diff changeset
376 *inOutDataSize = mChunkSize;
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Sam Lantinga <slouken@libsdl.org>
parents: 613
diff changeset
377 *inOutData = mReadFromFirstBuffer ? mFileBuffer : (mFileBuffer + mChunkSize);
de1b2c3063b9 Max has been reworking this code so it works on MacOS X 10.1
Sam Lantinga <slouken@libsdl.org>
parents: 613
diff changeset
378 }
613
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379
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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
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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 }