src/cdrom/macosx/AudioFileReaderThread.cpp
author Sam Lantinga <slouken@libsdl.org>
Sat, 28 Jun 2003 17:03:57 +0000
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child 768 de1b2c3063b9
permissions -rw-r--r--
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002  Sam Lantinga
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    This library is free software; you can redistribute it and/or
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    modify it under the terms of the GNU Library General Public
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    License as published by the Free Software Foundation; either
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    version 2 of the License, or (at your option) any later version.
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    This library is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    Library General Public License for more details.
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    You should have received a copy of the GNU Library General Public
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    License along with this library; if not, write to the Free
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    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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    Sam Lantinga
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    slouken@libsdl.org
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    This file based on Apple sample code. We haven't changed the file name, 
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    so if you want to see the original search for it on apple.com/developer
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*/
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//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// AudioFileReaderThread.cpp
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//
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#include "AudioFilePlayer.h"
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#include <mach/mach.h> //used for setting policy of thread
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#include "CAGuard.h"
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#include <pthread.h>
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#include <list>
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class FileReaderThread {
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public:
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	FileReaderThread ();
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	CAGuard&					GetGuard() { return mGuard; }
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	void						AddReader();
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	void						RemoveReader (const AudioFileReaderThread* inItem);
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		// returns true if succeeded
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	bool						TryNextRead (AudioFileReaderThread* inItem)
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	{
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		bool didLock = false;
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		bool succeeded = false;
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		if (mGuard.Try (didLock))
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		{
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			mFileData.push_back (inItem);
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			mGuard.Notify();
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			succeeded = true;
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			if (didLock)
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				mGuard.Unlock();
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		}
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		return succeeded;
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	}	
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    int		mThreadShouldDie;
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private:
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	typedef	std::list<AudioFileReaderThread*> FileData;
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	CAGuard				mGuard;
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	UInt32				mThreadPriority;
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	int					mNumReaders;	
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	FileData			mFileData;
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	void 						ReadNextChunk ();
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	void 						StartFixedPriorityThread ();
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    static UInt32				GetThreadBasePriority (pthread_t inThread);
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	static void*				DiskReaderEntry (void *inRefCon);
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};
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FileReaderThread::FileReaderThread ()
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	  : mThreadPriority (62),
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		mNumReaders (0)
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{
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}
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void	FileReaderThread::AddReader()
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{
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	if (mNumReaders == 0)
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	{
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		mThreadShouldDie = false;
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		StartFixedPriorityThread ();
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	}
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	mNumReaders++;
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}
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void	FileReaderThread::RemoveReader (const AudioFileReaderThread* inItem)
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{
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	if (mNumReaders > 0)
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	{
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		CAGuard::Locker fileReadLock (mGuard);
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		for (FileData::iterator iter = mFileData.begin(); iter != mFileData.end(); ++iter)
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		{
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			if ((*iter) == inItem) {	
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				mFileData.erase (iter);
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			}
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		}
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		if (--mNumReaders == 0) {
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			mThreadShouldDie = true;
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			mGuard.Notify(); // wake up thread so it will quit
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            mGuard.Wait();   // wait for thread to die
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		}
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	}	
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}
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void 	FileReaderThread::StartFixedPriorityThread ()
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{
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	pthread_attr_t		theThreadAttrs;
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	pthread_t			pThread;
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   126
	
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   127
	OSStatus result = pthread_attr_init(&theThreadAttrs);
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		THROW_RESULT("pthread_attr_init - Thread attributes could not be created.")
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   129
	
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   130
	result = pthread_attr_setdetachstate(&theThreadAttrs, PTHREAD_CREATE_DETACHED);
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		THROW_RESULT("pthread_attr_setdetachstate - Thread attributes could not be detached.")
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   132
	
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   133
	result = pthread_create (&pThread, &theThreadAttrs, DiskReaderEntry, this);
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		THROW_RESULT("pthread_create - Create and start the thread.")
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   135
	
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	pthread_attr_destroy(&theThreadAttrs);
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   137
    
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   138
	// we've now created the thread and started it
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   139
	// we'll now set the priority of the thread to the nominated priority
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   140
	// and we'll also make the thread fixed
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   141
    thread_extended_policy_data_t		theFixedPolicy;
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   142
    thread_precedence_policy_data_t		thePrecedencePolicy;
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   143
    SInt32								relativePriority;
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   144
    
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   145
    // make thread fixed
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   146
    theFixedPolicy.timeshare = false;	// set to true for a non-fixed thread
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   147
    result = thread_policy_set (pthread_mach_thread_np(pThread), THREAD_EXTENDED_POLICY, (thread_policy_t)&theFixedPolicy, THREAD_EXTENDED_POLICY_COUNT);
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   148
        THROW_RESULT("thread_policy - Couldn't set thread as fixed priority.")
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   149
    // set priority
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   150
    // precedency policy's "importance" value is relative to spawning thread's priority
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   151
    relativePriority = mThreadPriority - FileReaderThread::GetThreadBasePriority (pthread_self());
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   152
        
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   153
    thePrecedencePolicy.importance = relativePriority;
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   154
    result = thread_policy_set (pthread_mach_thread_np(pThread), THREAD_PRECEDENCE_POLICY, (thread_policy_t)&thePrecedencePolicy, THREAD_PRECEDENCE_POLICY_COUNT);
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   155
        THROW_RESULT("thread_policy - Couldn't set thread priority.")
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   156
}
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   157
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   158
UInt32	FileReaderThread::GetThreadBasePriority (pthread_t inThread)
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   159
{
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   160
    thread_basic_info_data_t			threadInfo;
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   161
	policy_info_data_t					thePolicyInfo;
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   162
	unsigned int						count;
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   163
    
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   164
    // get basic info
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   165
    count = THREAD_BASIC_INFO_COUNT;
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   166
    thread_info (pthread_mach_thread_np (inThread), THREAD_BASIC_INFO, (integer_t*)&threadInfo, &count);
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   167
    
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   168
	switch (threadInfo.policy) {
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   169
		case POLICY_TIMESHARE:
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			count = POLICY_TIMESHARE_INFO_COUNT;
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   171
			thread_info(pthread_mach_thread_np (inThread), THREAD_SCHED_TIMESHARE_INFO, (integer_t*)&(thePolicyInfo.ts), &count);
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   172
			return thePolicyInfo.ts.base_priority;
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   173
            break;
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   174
            
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   175
        case POLICY_FIFO:
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   176
			count = POLICY_FIFO_INFO_COUNT;
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   177
			thread_info(pthread_mach_thread_np (inThread), THREAD_SCHED_FIFO_INFO, (integer_t*)&(thePolicyInfo.fifo), &count);
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   178
            if (thePolicyInfo.fifo.depressed) {
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   179
                return thePolicyInfo.fifo.depress_priority;
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   180
            } else {
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   181
                return thePolicyInfo.fifo.base_priority;
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   182
            }
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   183
            break;
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   184
            
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   185
		case POLICY_RR:
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   186
			count = POLICY_RR_INFO_COUNT;
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   187
			thread_info(pthread_mach_thread_np (inThread), THREAD_SCHED_RR_INFO, (integer_t*)&(thePolicyInfo.rr), &count);
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   188
			if (thePolicyInfo.rr.depressed) {
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   189
                return thePolicyInfo.rr.depress_priority;
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diff changeset
   190
            } else {
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   191
                return thePolicyInfo.rr.base_priority;
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diff changeset
   192
            }
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   193
            break;
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diff changeset
   194
	}
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   195
    
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   196
    return 0;
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diff changeset
   197
}
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   198
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   199
void	*FileReaderThread::DiskReaderEntry (void *inRefCon)
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   200
{
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   201
	FileReaderThread *This = (FileReaderThread *)inRefCon;
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   202
	This->ReadNextChunk();
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   203
	#if DEBUG
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   204
	printf ("finished with reading file\n");
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   205
	#endif
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diff changeset
   206
	
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   207
	return 0;
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   208
}
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   209
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   210
void 	FileReaderThread::ReadNextChunk ()
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   211
{
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   212
	OSStatus result;
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   213
	UInt32	dataChunkSize;
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   214
	AudioFileReaderThread* theItem = 0;
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   215
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   216
	for (;;) 
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   217
	{
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   218
		{ // this is a scoped based lock
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   219
			CAGuard::Locker fileReadLock (mGuard);
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diff changeset
   220
			
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diff changeset
   221
			if (this->mThreadShouldDie) {
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diff changeset
   222
            
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diff changeset
   223
                mGuard.Notify();
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   224
                return;
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diff changeset
   225
            }
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diff changeset
   226
			
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   227
			if (mFileData.empty())
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   228
			{
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   229
				mGuard.Wait();
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diff changeset
   230
			}
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diff changeset
   231
			            
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
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diff changeset
   232
			// kill thread
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diff changeset
   233
			if (this->mThreadShouldDie) {
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
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diff changeset
   234
            
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
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diff changeset
   235
                mGuard.Notify();
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diff changeset
   236
                return;
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diff changeset
   237
            }
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diff changeset
   238
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diff changeset
   239
			theItem = mFileData.front();
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diff changeset
   240
			mFileData.pop_front();
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
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diff changeset
   241
		}
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
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parents:
diff changeset
   242
	
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
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diff changeset
   243
		if ((theItem->mFileLength - theItem->mReadFilePosition) < theItem->mChunkSize)
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
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diff changeset
   244
			dataChunkSize = theItem->mFileLength - theItem->mReadFilePosition;
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
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diff changeset
   245
		else
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   246
			dataChunkSize = theItem->mChunkSize;
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   247
		
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   248
			// this is the exit condition for the thread
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   249
		if (dataChunkSize == 0) {
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   250
			theItem->mFinishedReadingData = true;
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   251
			continue;
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   252
		}
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   253
			// construct pointer
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   254
		char* writePtr = const_cast<char*>(theItem->GetFileBuffer() + 
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   255
								(theItem->mWriteToFirstBuffer ? 0 : theItem->mChunkSize));
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   256
	
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   257
/*
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   258
        printf ("AudioFileReadBytes: theItem=%.8X fileID=%.8X pos=%.8X sz=%.8X flen=%.8X ptr=%.8X\n", 
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   259
            (unsigned int)theItem, (unsigned int)theItem->GetFileID(),
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   260
            (unsigned int)theItem->mReadFilePosition, (unsigned int)dataChunkSize, 
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   261
            (unsigned int)theItem->mFileLength, (unsigned int)writePtr);
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   262
*/            
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   263
		result = AudioFileReadBytes (theItem->GetFileID(), 
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   264
									false,
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   265
									theItem->mReadFilePosition, 
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   266
									&dataChunkSize, 
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diff changeset
   267
									writePtr);
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   268
		if (result) {
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   269
			theItem->GetParent().DoNotification(result);
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   270
			continue;
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   271
		}
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   272
		
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
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   273
		if (dataChunkSize != theItem->mChunkSize)
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   274
		{
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   275
			writePtr += dataChunkSize;
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   276
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   277
            // can't exit yet.. we still have to pass the partial buffer back
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   278
            memset (writePtr, 0, (theItem->mChunkSize - dataChunkSize));
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   279
        }
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   280
		
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
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   281
		theItem->mWriteToFirstBuffer = !theItem->mWriteToFirstBuffer;	// switch buffers
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   282
		
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   283
		theItem->mReadFilePosition += dataChunkSize;		// increment count
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diff changeset
   284
	}
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   285
}
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   286
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   287
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   288
static FileReaderThread sReaderThread;
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   289
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   290
AudioFileReaderThread::AudioFileReaderThread (AudioFilePlayer	&inParent, 
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   291
										AudioFileID 			&inFile, 
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   292
										SInt64 					inFileLength,
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   293
										UInt32					inChunkSize)
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diff changeset
   294
	: AudioFileManager (inParent, inFile),
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   295
	  mChunkSize (inChunkSize),
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   296
	  mFileLength (inFileLength),
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   297
	  mReadFilePosition (0),
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   298
	  mWriteToFirstBuffer (false),
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   299
	  mFinishedReadingData (false),
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diff changeset
   300
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
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   301
	  mLockUnsuccessful (false),
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   302
	  mIsEngaged (false)
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   303
{
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diff changeset
   304
	mFileBuffer = (char*) malloc (mChunkSize * 2);
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
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diff changeset
   305
    assert (mFileBuffer != NULL);
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diff changeset
   306
}
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parents:
diff changeset
   307
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diff changeset
   308
void	AudioFileReaderThread::DoConnect ()
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diff changeset
   309
{
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diff changeset
   310
	if (!mIsEngaged)
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diff changeset
   311
	{
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diff changeset
   312
		//mReadFilePosition = 0;
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   313
		mFinishedReadingData = false;
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
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parents:
diff changeset
   314
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
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diff changeset
   315
		mNumTimesAskedSinceFinished = -1;
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
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parents:
diff changeset
   316
		mLockUnsuccessful = false;
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
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diff changeset
   317
		
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
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diff changeset
   318
		UInt32 dataChunkSize;
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
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diff changeset
   319
        
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
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parents:
diff changeset
   320
        if ((mFileLength - mReadFilePosition) < mChunkSize)
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
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parents:
diff changeset
   321
			dataChunkSize = mFileLength - mReadFilePosition;
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
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parents:
diff changeset
   322
		else
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
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parents:
diff changeset
   323
			dataChunkSize = mChunkSize;
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
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parents:
diff changeset
   324
        
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
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parents:
diff changeset
   325
		OSStatus result = AudioFileReadBytes ( mAudioFileID, 
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
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parents:
diff changeset
   326
												false, 
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   327
												mReadFilePosition, 
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
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parents:
diff changeset
   328
												&dataChunkSize, 
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
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parents:
diff changeset
   329
												mFileBuffer);
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
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parents:
diff changeset
   330
            THROW_RESULT("AudioFileReadBytes")
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   331
            
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   332
		mReadFilePosition += dataChunkSize;
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   333
				
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   334
		mWriteToFirstBuffer = false;
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   335
		mReadFromFirstBuffer = true;
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
		sReaderThread.AddReader();
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
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parents:
diff changeset
   338
		
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   339
		mIsEngaged = true;
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
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parents:
diff changeset
   340
	}
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   341
	else
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
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parents:
diff changeset
   342
		throw static_cast<OSStatus>(-1); //thread has already been started
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   343
}
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
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parents:
diff changeset
   344
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   345
void	AudioFileReaderThread::Disconnect ()
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
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parents:
diff changeset
   346
{
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
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parents:
diff changeset
   347
	if (mIsEngaged) 
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   348
	{
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
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parents:
diff changeset
   349
		sReaderThread.RemoveReader (this);
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
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parents:
diff changeset
   350
		mIsEngaged = false;
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
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parents:
diff changeset
   351
	}
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   352
}
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   353
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   354
OSStatus AudioFileReaderThread::GetFileData (void** inOutData, UInt32 *inOutDataSize)
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
	if (mFinishedReadingData) 
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
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parents:
diff changeset
   357
	{
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
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parents:
diff changeset
   358
		++mNumTimesAskedSinceFinished;
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
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parents:
diff changeset
   359
		*inOutDataSize = 0;
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   360
		*inOutData = 0;
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   361
		return noErr;
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   362
	}
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   363
	
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   364
	if (mReadFromFirstBuffer == mWriteToFirstBuffer) {
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   365
		#if DEBUG
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   366
		printf ("* * * * * * * Can't keep up with reading file:%ld\n", mParent.GetBusNumber());
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   367
		#endif
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
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parents:
diff changeset
   368
		
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   369
		mParent.DoNotification (kAudioFilePlayErr_FilePlayUnderrun);
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   370
		*inOutDataSize = 0;
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   371
		*inOutData = 0;
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   372
	} else {
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
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parents:
diff changeset
   373
		*inOutDataSize = mChunkSize;
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
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parents:
diff changeset
   374
		*inOutData = mReadFromFirstBuffer ? mFileBuffer : (mFileBuffer + mChunkSize);
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
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parents:
diff changeset
   375
	}
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   376
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   377
	mLockUnsuccessful = !sReaderThread.TryNextRead (this);
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   378
	
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   379
	mReadFromFirstBuffer = !mReadFromFirstBuffer;
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
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parents:
diff changeset
   380
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
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parents:
diff changeset
   381
	return noErr;
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   382
}
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   383
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   384
void 	AudioFileReaderThread::AfterRender ()
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   385
{
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   386
	if (mNumTimesAskedSinceFinished > 0)
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   387
	{
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   388
		bool didLock = false;
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   389
		if (sReaderThread.GetGuard().Try (didLock)) {
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   390
			mParent.DoNotification (kAudioFilePlay_FileIsFinished);
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   391
			if (didLock)
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   392
				sReaderThread.GetGuard().Unlock();
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   393
		}
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   394
	}
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   395
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   396
	if (mLockUnsuccessful)
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   397
		mLockUnsuccessful = !sReaderThread.TryNextRead (this);
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   398
}
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   399
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   400
void 	AudioFileReaderThread::SetPosition (SInt64 pos)
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   401
{
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   402
    if (pos < 0 || pos >= mFileLength) {
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   403
        SDL_SetError ("AudioFileReaderThread::SetPosition - position invalid: %d filelen=%d\n", 
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   404
            (unsigned int)pos, (unsigned int)mFileLength);
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   405
        pos = 0;
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   406
    }
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   407
        
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   408
    mReadFilePosition = pos;
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   409
}
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   410
    
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   411
void 	AudioFileReaderThread::SetEndOfFile (SInt64 pos)
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   412
{
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   413
    if (pos <= 0 || pos > mFileLength) {
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   414
        SDL_SetError ("AudioFileReaderThread::SetEndOfFile - position beyond actual eof\n");
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   415
        pos = mFileLength;
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   416
    }
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   417
    
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   418
    mFileLength = pos;
9c6717a1c66f Added MacOS X CD-ROM audio support (thanks Max and Darrell)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   419
}