summaryrefslogtreecommitdiff
path: root/indra/llaudio/llaudioengine_fmod.cpp
blob: 88dfdb9c2449c5e3d2a88c38e731c3d1a0ffc88b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
/** 
 * @file audioengine_fmod.cpp
 * @brief Implementation of LLAudioEngine class abstracting the audio support as a FMOD 3D implementation
 *
 * $LicenseInfo:firstyear=2002&license=viewerlgpl$
 * Second Life Viewer Source Code
 * Copyright (C) 2010, Linden Research, Inc.
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation;
 * version 2.1 of the License only.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 * 
 * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
 * $/LicenseInfo$
 */

#include "linden_common.h"

#include "llstreamingaudio.h"
#include "llstreamingaudio_fmod.h"

#include "llaudioengine_fmod.h"
#include "lllistener_fmod.h"

#include "llerror.h"
#include "llmath.h"
#include "llrand.h"

#include "fmod.h"
#include "fmod_errors.h"
#include "lldir.h"
#include "llapr.h"

#include "sound_ids.h"


extern "C" {
	void * F_CALLBACKAPI windCallback(void *originalbuffer, void *newbuffer, int length, void* userdata);
}


LLAudioEngine_FMOD::LLAudioEngine_FMOD()
{
	mInited = false;
	mWindGen = NULL;
	mWindDSP = NULL;
}


LLAudioEngine_FMOD::~LLAudioEngine_FMOD()
{
}


bool LLAudioEngine_FMOD::init(const S32 num_channels, void* userdata)
{
	LLAudioEngine::init(num_channels, userdata);

	// Reserve one extra channel for the http stream.
	if (!FSOUND_SetMinHardwareChannels(num_channels + 1))
	{
		LL_WARNS("AppInit") << "FMOD::init[0](), error: " << FMOD_ErrorString(FSOUND_GetError()) << LL_ENDL;
	}

	LL_DEBUGS("AppInit") << "LLAudioEngine_FMOD::init() initializing FMOD" << LL_ENDL;

	F32 version = FSOUND_GetVersion();
	if (version < FMOD_VERSION)
	{
		LL_WARNS("AppInit") << "Error : You are using the wrong FMOD version (" << version
			<< ")!  You should be using FMOD " << FMOD_VERSION << LL_ENDL;
		//return false;
	}

	U32 fmod_flags = 0x0;

#if LL_WINDOWS
	// Windows needs to know which window is frontmost.
	// This must be called before FSOUND_Init() per the FMOD docs.
	// This could be used to let FMOD handle muting when we lose focus,
	// but we don't actually want to do that because we want to distinguish
	// between minimized and not-focused states.
	if (!FSOUND_SetHWND(userdata))
	{
		LL_WARNS("AppInit") << "Error setting FMOD window: "
			<< FMOD_ErrorString(FSOUND_GetError()) << LL_ENDL;
		return false;
	}
	// Play audio when we don't have focus.
	// (For example, IM client on top of us.)
	// This means we also try to play audio when minimized,
	// so we manually handle muting in that case. JC
	fmod_flags |= FSOUND_INIT_GLOBALFOCUS;
#endif

#if LL_LINUX
	// initialize the FMOD engine

	// This is a hack to use only FMOD's basic FPU mixer
	// when the LL_VALGRIND environmental variable is set,
	// otherwise valgrind will fall over on FMOD's MMX detection
	if (getenv("LL_VALGRIND"))		/*Flawfinder: ignore*/
	{
		LL_INFOS("AppInit") << "Pacifying valgrind in FMOD init." << LL_ENDL;
		FSOUND_SetMixer(FSOUND_MIXER_QUALITY_FPU);
	}

	// If we don't set an output method, Linux FMOD always
	// decides on OSS and fails otherwise.  So we'll manually
	// try ESD, then OSS, then ALSA.
	// Why this order?  See SL-13250, but in short, OSS emulated
	// on top of ALSA is ironically more reliable than raw ALSA.
	// Ack, and ESD has more reliable failure modes - but has worse
	// latency - than all of them, so wins for now.
	bool audio_ok = false;

	if (!audio_ok)
	{
		if (NULL == getenv("LL_BAD_FMOD_ESD")) /*Flawfinder: ignore*/
		{
			LL_DEBUGS("AppInit") << "Trying ESD audio output..." << LL_ENDL;
			if(FSOUND_SetOutput(FSOUND_OUTPUT_ESD) &&
			   FSOUND_Init(44100, num_channels, fmod_flags))
			{
				LL_DEBUGS("AppInit") << "ESD audio output initialized OKAY"
					<< LL_ENDL;
				audio_ok = true;
			} else {
				LL_WARNS("AppInit") << "ESD audio output FAILED to initialize: "
					<< FMOD_ErrorString(FSOUND_GetError()) << LL_ENDL;
			}
		} else {
			LL_DEBUGS("AppInit") << "ESD audio output SKIPPED" << LL_ENDL;
		}
	}
	if (!audio_ok)
	{
		if (NULL == getenv("LL_BAD_FMOD_OSS")) 	 /*Flawfinder: ignore*/
		{
			LL_DEBUGS("AppInit") << "Trying OSS audio output..."	<< LL_ENDL;
			if(FSOUND_SetOutput(FSOUND_OUTPUT_OSS) &&
			   FSOUND_Init(44100, num_channels, fmod_flags))
			{
				LL_DEBUGS("AppInit") << "OSS audio output initialized OKAY" << LL_ENDL;
				audio_ok = true;
			} else {
				LL_WARNS("AppInit") << "OSS audio output FAILED to initialize: "
					<< FMOD_ErrorString(FSOUND_GetError()) << LL_ENDL;
			}
		} else {
			LL_DEBUGS("AppInit") << "OSS audio output SKIPPED" << LL_ENDL;
		}
	}
	if (!audio_ok)
	{
		if (NULL == getenv("LL_BAD_FMOD_ALSA"))		/*Flawfinder: ignore*/
		{
			LL_DEBUGS("AppInit") << "Trying ALSA audio output..." << LL_ENDL;
			if(FSOUND_SetOutput(FSOUND_OUTPUT_ALSA) &&
			   FSOUND_Init(44100, num_channels, fmod_flags))
			{
				LL_DEBUGS("AppInit") << "ALSA audio output initialized OKAY" << LL_ENDL;
				audio_ok = true;
			} else {
				LL_WARNS("AppInit") << "ALSA audio output FAILED to initialize: "
					<< FMOD_ErrorString(FSOUND_GetError()) << LL_ENDL;
			}
		} else {
			LL_DEBUGS("AppInit") << "OSS audio output SKIPPED" << LL_ENDL;
		}
	}
	if (!audio_ok)
	{
		LL_WARNS("AppInit") << "Overall audio init failure." << LL_ENDL;
		return false;
	}

	// On Linux, FMOD causes a SIGPIPE for some netstream error
	// conditions (an FMOD bug); ignore SIGPIPE so it doesn't crash us.
	// NOW FIXED in FMOD 3.x since 2006-10-01.
	//signal(SIGPIPE, SIG_IGN);

	// We're interested in logging which output method we
	// ended up with, for QA purposes.
	switch (FSOUND_GetOutput())
	{
	case FSOUND_OUTPUT_NOSOUND: LL_DEBUGS("AppInit") << "Audio output: NoSound" << LL_ENDL; break;
	case FSOUND_OUTPUT_OSS:	LL_DEBUGS("AppInit") << "Audio output: OSS" << LL_ENDL; break;
	case FSOUND_OUTPUT_ESD:	LL_DEBUGS("AppInit") << "Audio output: ESD" << LL_ENDL; break;
	case FSOUND_OUTPUT_ALSA: LL_DEBUGS("AppInit") << "Audio output: ALSA" << LL_ENDL; break;
	default: LL_INFOS("AppInit") << "Audio output: Unknown!" << LL_ENDL; break;
	};

#else // LL_LINUX

	// initialize the FMOD engine
	if (!FSOUND_Init(44100, num_channels, fmod_flags))
	{
		LL_WARNS("AppInit") << "Error initializing FMOD: "
			<< FMOD_ErrorString(FSOUND_GetError()) << LL_ENDL;
		return false;
	}
	
#endif

	// set up our favourite FMOD-native streaming audio implementation if none has already been added
	if (!getStreamingAudioImpl()) // no existing implementation added
		setStreamingAudioImpl(new LLStreamingAudio_FMOD());

	LL_DEBUGS("AppInit") << "LLAudioEngine_FMOD::init() FMOD initialized correctly" << LL_ENDL;

	mInited = true;

	return true;
}


std::string LLAudioEngine_FMOD::getDriverName(bool verbose)
{
	if (verbose)
	{
		F32 version = FSOUND_GetVersion();
		return llformat("FMOD version %f", version);
	}
	else
	{
		return "FMOD";
	}
}


void LLAudioEngine_FMOD::allocateListener(void)
{	
	mListenerp = (LLListener *) new LLListener_FMOD();
	if (!mListenerp)
	{
		llwarns << "Listener creation failed" << llendl;
	}
}


void LLAudioEngine_FMOD::shutdown()
{
	if (mWindDSP)
	{
		FSOUND_DSP_SetActive(mWindDSP,false);
		FSOUND_DSP_Free(mWindDSP);
	}

	stopInternetStream();

	LLAudioEngine::shutdown();
	
	llinfos << "LLAudioEngine_FMOD::shutdown() closing FMOD" << llendl;
	FSOUND_Close();
	llinfos << "LLAudioEngine_FMOD::shutdown() done closing FMOD" << llendl;

	delete mListenerp;
	mListenerp = NULL;
}


LLAudioBuffer * LLAudioEngine_FMOD::createBuffer()
{
	return new LLAudioBufferFMOD();
}


LLAudioChannel * LLAudioEngine_FMOD::createChannel()
{
	return new LLAudioChannelFMOD();
}


bool LLAudioEngine_FMOD::initWind()
{
	if (!mWindGen)
	{
		bool enable;
		
		switch (FSOUND_GetMixer())
		{
			case FSOUND_MIXER_MMXP5:
			case FSOUND_MIXER_MMXP6:
			case FSOUND_MIXER_QUALITY_MMXP5:
			case FSOUND_MIXER_QUALITY_MMXP6:
				enable = (typeid(MIXBUFFERFORMAT) == typeid(S16));
				break;
			case FSOUND_MIXER_BLENDMODE:
				enable = (typeid(MIXBUFFERFORMAT) == typeid(S32));
				break;
			case FSOUND_MIXER_QUALITY_FPU:
				enable = (typeid(MIXBUFFERFORMAT) == typeid(F32));
				break;
			default:
				// FSOUND_GetMixer() does not return a valid mixer type on Darwin
				LL_INFOS("AppInit") << "Unknown FMOD mixer type, assuming default" << LL_ENDL;
				enable = true;
				break;
		}
		
		if (enable)
		{
			mWindGen = new LLWindGen<MIXBUFFERFORMAT>(FSOUND_GetOutputRate());
		}
		else
		{
			LL_WARNS("AppInit") << "Incompatible FMOD mixer type, wind noise disabled" << LL_ENDL;
		}
	}

	mNextWindUpdate = 0.0;

	if (mWindGen && !mWindDSP)
	{
		mWindDSP = FSOUND_DSP_Create(&windCallback, FSOUND_DSP_DEFAULTPRIORITY_CLEARUNIT + 20, mWindGen);
	}
	if (mWindDSP)
	{
		FSOUND_DSP_SetActive(mWindDSP, true);
		return true;
	}
	
	return false;
}


void LLAudioEngine_FMOD::cleanupWind()
{
	if (mWindDSP)
	{
		FSOUND_DSP_SetActive(mWindDSP, false);
		FSOUND_DSP_Free(mWindDSP);
		mWindDSP = NULL;
	}

	delete mWindGen;
	mWindGen = NULL;
}


//-----------------------------------------------------------------------
void LLAudioEngine_FMOD::updateWind(LLVector3 wind_vec, F32 camera_height_above_water)
{
	LLVector3 wind_pos;
	F64 pitch;
	F64 center_freq;

	if (!mEnableWind)
	{
		return;
	}
	
	if (mWindUpdateTimer.checkExpirationAndReset(LL_WIND_UPDATE_INTERVAL))
	{
		
		// wind comes in as Linden coordinate (+X = forward, +Y = left, +Z = up)
		// need to convert this to the conventional orientation DS3D and OpenAL use
		// where +X = right, +Y = up, +Z = backwards

		wind_vec.setVec(-wind_vec.mV[1], wind_vec.mV[2], -wind_vec.mV[0]);

		// cerr << "Wind update" << endl;

		pitch = 1.0 + mapWindVecToPitch(wind_vec);
		center_freq = 80.0 * pow(pitch,2.5*(mapWindVecToGain(wind_vec)+1.0));
		
		mWindGen->mTargetFreq = (F32)center_freq;
		mWindGen->mTargetGain = (F32)mapWindVecToGain(wind_vec) * mMaxWindGain;
		mWindGen->mTargetPanGainR = (F32)mapWindVecToPan(wind_vec);
  	}
}

/*
//-----------------------------------------------------------------------
void LLAudioEngine_FMOD::setSourceMinDistance(U16 source_num, F64 distance)
{
	if (!mInited)
	{
		return;
	}
	if (mBuffer[source_num])
	{
		mMinDistance[source_num] = (F32) distance;
		if (!FSOUND_Sample_SetMinMaxDistance(mBuffer[source_num],mMinDistance[source_num], mMaxDistance[source_num]))
		{
			llwarns << "FMOD::setSourceMinDistance(" << source_num << "), error: " << FMOD_ErrorString(FSOUND_GetError()) << llendl;
		}
	}
}

//-----------------------------------------------------------------------
void LLAudioEngine_FMOD::setSourceMaxDistance(U16 source_num, F64 distance)
{
	if (!mInited)
	{
		return;
	}
	if (mBuffer[source_num])
	{
		mMaxDistance[source_num] = (F32) distance;
		if (!FSOUND_Sample_SetMinMaxDistance(mBuffer[source_num],mMinDistance[source_num], mMaxDistance[source_num]))
		{
			llwarns << "FMOD::setSourceMaxDistance(" << source_num << "), error: " << FMOD_ErrorString(FSOUND_GetError()) << llendl;
		}
	}
}

//-----------------------------------------------------------------------
void LLAudioEngine_FMOD::get3DParams(S32 source_num, S32 *volume, S32 *freq, S32 *inside, S32 *outside, LLVector3 *orient, S32 *out_volume, F32 *min_dist, F32 *max_dist)
{
	*volume = 0;
	*freq = 0;
	*inside = 0;
	*outside = 0;
	*orient = LLVector3::zero;
	*out_volume = 0;
	*min_dist = 0.f;
	*max_dist = 0.f;
}

*/


//-----------------------------------------------------------------------
void LLAudioEngine_FMOD::setInternalGain(F32 gain)
{
	if (!mInited)
	{
		return;
	}

	gain = llclamp( gain, 0.0f, 1.0f );
	FSOUND_SetSFXMasterVolume( llround( 255.0f * gain ) );

	LLStreamingAudioInterface *saimpl = getStreamingAudioImpl();
	if ( saimpl )
	{
		// fmod likes its streaming audio channel gain re-asserted after
		// master volume change.
		saimpl->setGain(saimpl->getGain());
	}
}

//
// LLAudioChannelFMOD implementation
//

LLAudioChannelFMOD::LLAudioChannelFMOD() : LLAudioChannel(), mChannelID(0), mLastSamplePos(0)
{
}


LLAudioChannelFMOD::~LLAudioChannelFMOD()
{
	cleanup();
}


bool LLAudioChannelFMOD::updateBuffer()
{
	if (LLAudioChannel::updateBuffer())
	{
		// Base class update returned true, which means that we need to actually
		// set up the channel for a different buffer.

		LLAudioBufferFMOD *bufferp = (LLAudioBufferFMOD *)mCurrentSourcep->getCurrentBuffer();

		// Grab the FMOD sample associated with the buffer
		FSOUND_SAMPLE *samplep = bufferp->getSample();
		if (!samplep)
		{
			// This is bad, there should ALWAYS be a sample associated with a legit
			// buffer.
			llerrs << "No FMOD sample!" << llendl;
			return false;
		}


		// Actually play the sound.  Start it off paused so we can do all the necessary
		// setup.
		mChannelID = FSOUND_PlaySoundEx(FSOUND_FREE, samplep, FSOUND_DSP_GetSFXUnit(), true);

		//llinfos << "Setting up channel " << std::hex << mChannelID << std::dec << llendl;
	}

	// If we have a source for the channel, we need to update its gain.
	if (mCurrentSourcep)
	{
		// SJB: warnings can spam and hurt framerate, disabling
		if (!FSOUND_SetVolume(mChannelID, llround(getSecondaryGain() * mCurrentSourcep->getGain() * 255.0f)))
		{
// 			llwarns << "LLAudioChannelFMOD::updateBuffer error: " << FMOD_ErrorString(FSOUND_GetError()) << llendl;
		}
		
		if (!FSOUND_SetLoopMode(mChannelID, mCurrentSourcep->isLoop() ? FSOUND_LOOP_NORMAL : FSOUND_LOOP_OFF))
		{
// 			llwarns << "Channel " << mChannelID << "Source ID: " << mCurrentSourcep->getID()
// 					<< " at " << mCurrentSourcep->getPositionGlobal() << llendl;
// 			llwarns << "LLAudioChannelFMOD::updateBuffer error: " << FMOD_ErrorString(FSOUND_GetError()) << llendl;
		}
	}

	return true;
}


void LLAudioChannelFMOD::update3DPosition()
{
	if (!mChannelID)
	{
		// We're not actually a live channel (i.e., we're not playing back anything)
		return;
	}

	LLAudioBufferFMOD *bufferp = (LLAudioBufferFMOD *)mCurrentBufferp;
	if (!bufferp)
	{
		// We don't have a buffer associated with us (should really have been picked up
		// by the above if.
		return;
	}

	if (mCurrentSourcep->isAmbient())
	{
		// Ambient sound, don't need to do any positional updates.
		bufferp->set3DMode(false);
	}
	else
	{
		// Localized sound.  Update the position and velocity of the sound.
		bufferp->set3DMode(true);

		LLVector3 float_pos;
		float_pos.setVec(mCurrentSourcep->getPositionGlobal());
		if (!FSOUND_3D_SetAttributes(mChannelID, float_pos.mV, mCurrentSourcep->getVelocity().mV))
		{
			LL_DEBUGS("FMOD") << "LLAudioChannelFMOD::update3DPosition error: " << FMOD_ErrorString(FSOUND_GetError()) << LL_ENDL;
		}
	}
}


void LLAudioChannelFMOD::updateLoop()
{
	if (!mChannelID)
	{
		// May want to clear up the loop/sample counters.
		return;
	}

	//
	// Hack:  We keep track of whether we looped or not by seeing when the
	// sample position looks like it's going backwards.  Not reliable; may
	// yield false negatives.
	//
	U32 cur_pos = FSOUND_GetCurrentPosition(mChannelID);
	if (cur_pos < (U32)mLastSamplePos)
	{
		mLoopedThisFrame = true;
	}
	mLastSamplePos = cur_pos;
}


void LLAudioChannelFMOD::cleanup()
{
	if (!mChannelID)
	{
		//llinfos << "Aborting cleanup with no channelID." << llendl;
		return;
	}

	//llinfos << "Cleaning up channel: " << mChannelID << llendl;
	if (!FSOUND_StopSound(mChannelID))
	{
		LL_DEBUGS("FMOD") << "LLAudioChannelFMOD::cleanup error: " << FMOD_ErrorString(FSOUND_GetError()) << llendl;
	}

	mCurrentBufferp = NULL;
	mChannelID = 0;
}


void LLAudioChannelFMOD::play()
{
	if (!mChannelID)
	{
		llwarns << "Playing without a channelID, aborting" << llendl;
		return;
	}

	if (!FSOUND_SetPaused(mChannelID, false))
	{
		llwarns << "LLAudioChannelFMOD::play error: " << FMOD_ErrorString(FSOUND_GetError()) << llendl;
	}
	getSource()->setPlayedOnce(true);
}


void LLAudioChannelFMOD::playSynced(LLAudioChannel *channelp)
{
	LLAudioChannelFMOD *fmod_channelp = (LLAudioChannelFMOD*)channelp;
	if (!(fmod_channelp->mChannelID && mChannelID))
	{
		// Don't have channels allocated to both the master and the slave
		return;
	}

	U32 position = FSOUND_GetCurrentPosition(fmod_channelp->mChannelID) % mCurrentBufferp->getLength();
	// Try to match the position of our sync master
	if (!FSOUND_SetCurrentPosition(mChannelID, position))
	{
		llwarns << "LLAudioChannelFMOD::playSynced unable to set current position" << llendl;
	}

	// Start us playing
	play();
}


bool LLAudioChannelFMOD::isPlaying()
{
	if (!mChannelID)
	{
		return false;
	}

	return FSOUND_IsPlaying(mChannelID) && (!FSOUND_GetPaused(mChannelID));
}



//
// LLAudioBufferFMOD implementation
//


LLAudioBufferFMOD::LLAudioBufferFMOD()
{
	mSamplep = NULL;
}


LLAudioBufferFMOD::~LLAudioBufferFMOD()
{
	if (mSamplep)
	{
		// Clean up the associated FMOD sample if it exists.
		FSOUND_Sample_Free(mSamplep);
		mSamplep = NULL;
	}
}


bool LLAudioBufferFMOD::loadWAV(const std::string& filename)
{
	// Try to open a wav file from disk.  This will eventually go away, as we don't
	// really want to block doing this.
	if (filename.empty())
	{
		// invalid filename, abort.
		return false;
	}

	if (!LLAPRFile::isExist(filename, LL_APR_RPB))
	{
		// File not found, abort.
		return false;
	}
	
	if (mSamplep)
	{
		// If there's already something loaded in this buffer, clean it up.
		FSOUND_Sample_Free(mSamplep);
		mSamplep = NULL;
	}

	// Load up the wav file into an fmod sample
#if LL_WINDOWS
	// MikeS. - Loading the sound file manually and then handing it over to FMOD,
	//	since FMOD uses posix IO internally,
	// which doesn't work with unicode file paths.
	LLFILE* sound_file = LLFile::fopen(filename,"rb");	/* Flawfinder: ignore */
	if (sound_file)
	{
		fseek(sound_file,0,SEEK_END);
		U32	file_length = ftell(sound_file);	//Find the length of the file by seeking to the end and getting the offset
		size_t	read_count;
		fseek(sound_file,0,SEEK_SET);	//Seek back to the beginning
		char*	buffer = new char[file_length];
		llassert(buffer);
		read_count = fread((void*)buffer,file_length,1,sound_file);//Load it..
		if(ferror(sound_file)==0 && (read_count == 1)){//No read error, and we got 1 chunk of our size...
			unsigned int mode_flags = FSOUND_LOOP_NORMAL | FSOUND_LOADMEMORY;
									//FSOUND_16BITS | FSOUND_MONO | FSOUND_LOADMEMORY | FSOUND_LOOP_NORMAL;
			mSamplep = FSOUND_Sample_Load(FSOUND_UNMANAGED, buffer, mode_flags , 0, file_length);
		}
		delete[] buffer;
		fclose(sound_file);
	}
#else
	mSamplep = FSOUND_Sample_Load(FSOUND_UNMANAGED, filename.c_str(), FSOUND_LOOP_NORMAL, 0, 0);
#endif

	if (!mSamplep)
	{
		// We failed to load the file for some reason.
		llwarns << "Could not load data '" << filename << "': "
				<< FMOD_ErrorString(FSOUND_GetError()) << llendl;

		//
		// If we EVER want to load wav files provided by end users, we need
		// to rethink this!
		//
		// file is probably corrupt - remove it.
		LLFile::remove(filename);
		return false;
	}

	// Everything went well, return true
	return true;
}


U32 LLAudioBufferFMOD::getLength()
{
	if (!mSamplep)
	{
		return 0;
	}

	return FSOUND_Sample_GetLength(mSamplep);
}


void LLAudioBufferFMOD::set3DMode(bool use3d)
{
	U16 current_mode = FSOUND_Sample_GetMode(mSamplep);
	
	if (use3d)
	{
		if (!FSOUND_Sample_SetMode(mSamplep, (current_mode & (~FSOUND_2D))))
		{
			llwarns << "LLAudioBufferFMOD::set3DMode error: " << FMOD_ErrorString(FSOUND_GetError()) << llendl;
		}
	}
	else
	{
		if (!FSOUND_Sample_SetMode(mSamplep, current_mode | FSOUND_2D))
		{
			llwarns << "LLAudioBufferFMOD::set3DMode error: " << FMOD_ErrorString(FSOUND_GetError()) << llendl;
		}
	}
}


void * F_CALLBACKAPI windCallback(void *originalbuffer, void *newbuffer, int length, void* userdata)
{
	// originalbuffer = fmod's original mixbuffer.
	// newbuffer = the buffer passed from the previous DSP unit.
	// length = length in samples at this mix time.
	// userdata = user parameter passed through in FSOUND_DSP_Create.

	LLWindGen<LLAudioEngine_FMOD::MIXBUFFERFORMAT> *windgen =
		(LLWindGen<LLAudioEngine_FMOD::MIXBUFFERFORMAT> *)userdata;
	
	newbuffer = windgen->windGenerate((LLAudioEngine_FMOD::MIXBUFFERFORMAT *)newbuffer, length);

	return newbuffer;
}