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comparison: content/media/webaudio/PannerNode.cpp

content/media/webaudio/PannerNode.cpp

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1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 /* vim:set ts=2 sw=2 sts=2 et cindent: */
3 /* This Source Code Form is subject to the terms of the Mozilla Public
4 * License, v. 2.0. If a copy of the MPL was not distributed with this
5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
6
7 #include "PannerNode.h"
8 #include "AudioNodeEngine.h"
9 #include "AudioNodeStream.h"
10 #include "AudioListener.h"
11 #include "AudioBufferSourceNode.h"
12 #include "PlayingRefChangeHandler.h"
13 #include "blink/HRTFPanner.h"
14 #include "blink/HRTFDatabaseLoader.h"
15
16 using WebCore::HRTFDatabaseLoader;
17 using WebCore::HRTFPanner;
18
19 namespace mozilla {
20 namespace dom {
21
22 using namespace std;
23
24 NS_IMPL_CYCLE_COLLECTION_CLASS(PannerNode)
25
26 NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(PannerNode)
27 if (tmp->Context()) {
28 tmp->Context()->UnregisterPannerNode(tmp);
29 }
30 NS_IMPL_CYCLE_COLLECTION_UNLINK_END_INHERITED(AudioNode)
31
32 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(PannerNode, AudioNode)
33 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
34
35 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(PannerNode)
36 NS_INTERFACE_MAP_END_INHERITING(AudioNode)
37
38 NS_IMPL_ADDREF_INHERITED(PannerNode, AudioNode)
39 NS_IMPL_RELEASE_INHERITED(PannerNode, AudioNode)
40
41 class PannerNodeEngine : public AudioNodeEngine
42 {
43 public:
44 explicit PannerNodeEngine(AudioNode* aNode)
45 : AudioNodeEngine(aNode)
46 // Please keep these default values consistent with PannerNode::PannerNode below.
47 , mPanningModelFunction(&PannerNodeEngine::HRTFPanningFunction)
48 , mDistanceModelFunction(&PannerNodeEngine::InverseGainFunction)
49 , mPosition()
50 , mOrientation(1., 0., 0.)
51 , mVelocity()
52 , mRefDistance(1.)
53 , mMaxDistance(10000.)
54 , mRolloffFactor(1.)
55 , mConeInnerAngle(360.)
56 , mConeOuterAngle(360.)
57 , mConeOuterGain(0.)
58 // These will be initialized when a PannerNode is created, so just initialize them
59 // to some dummy values here.
60 , mListenerDopplerFactor(0.)
61 , mListenerSpeedOfSound(0.)
62 , mLeftOverData(INT_MIN)
63 {
64 // HRTFDatabaseLoader needs to be fetched on the main thread.
65 TemporaryRef<HRTFDatabaseLoader> loader =
66 HRTFDatabaseLoader::createAndLoadAsynchronouslyIfNecessary(aNode->Context()->SampleRate());
67 mHRTFPanner = new HRTFPanner(aNode->Context()->SampleRate(), loader);
68 }
69
70 virtual void SetInt32Parameter(uint32_t aIndex, int32_t aParam) MOZ_OVERRIDE
71 {
72 switch (aIndex) {
73 case PannerNode::PANNING_MODEL:
74 switch (PanningModelType(aParam)) {
75 case PanningModelType::Equalpower:
76 mPanningModelFunction = &PannerNodeEngine::EqualPowerPanningFunction;
77 break;
78 case PanningModelType::HRTF:
79 mPanningModelFunction = &PannerNodeEngine::HRTFPanningFunction;
80 break;
81 default:
82 NS_NOTREACHED("We should never see the alternate names here");
83 break;
84 }
85 break;
86 case PannerNode::DISTANCE_MODEL:
87 switch (DistanceModelType(aParam)) {
88 case DistanceModelType::Inverse:
89 mDistanceModelFunction = &PannerNodeEngine::InverseGainFunction;
90 break;
91 case DistanceModelType::Linear:
92 mDistanceModelFunction = &PannerNodeEngine::LinearGainFunction;
93 break;
94 case DistanceModelType::Exponential:
95 mDistanceModelFunction = &PannerNodeEngine::ExponentialGainFunction;
96 break;
97 default:
98 NS_NOTREACHED("We should never see the alternate names here");
99 break;
100 }
101 break;
102 default:
103 NS_ERROR("Bad PannerNodeEngine Int32Parameter");
104 }
105 }
106 virtual void SetThreeDPointParameter(uint32_t aIndex, const ThreeDPoint& aParam) MOZ_OVERRIDE
107 {
108 switch (aIndex) {
109 case PannerNode::LISTENER_POSITION: mListenerPosition = aParam; break;
110 case PannerNode::LISTENER_FRONT_VECTOR: mListenerFrontVector = aParam; break;
111 case PannerNode::LISTENER_RIGHT_VECTOR: mListenerRightVector = aParam; break;
112 case PannerNode::LISTENER_VELOCITY: mListenerVelocity = aParam; break;
113 case PannerNode::POSITION: mPosition = aParam; break;
114 case PannerNode::ORIENTATION: mOrientation = aParam; break;
115 case PannerNode::VELOCITY: mVelocity = aParam; break;
116 default:
117 NS_ERROR("Bad PannerNodeEngine ThreeDPointParameter");
118 }
119 }
120 virtual void SetDoubleParameter(uint32_t aIndex, double aParam) MOZ_OVERRIDE
121 {
122 switch (aIndex) {
123 case PannerNode::LISTENER_DOPPLER_FACTOR: mListenerDopplerFactor = aParam; break;
124 case PannerNode::LISTENER_SPEED_OF_SOUND: mListenerSpeedOfSound = aParam; break;
125 case PannerNode::REF_DISTANCE: mRefDistance = aParam; break;
126 case PannerNode::MAX_DISTANCE: mMaxDistance = aParam; break;
127 case PannerNode::ROLLOFF_FACTOR: mRolloffFactor = aParam; break;
128 case PannerNode::CONE_INNER_ANGLE: mConeInnerAngle = aParam; break;
129 case PannerNode::CONE_OUTER_ANGLE: mConeOuterAngle = aParam; break;
130 case PannerNode::CONE_OUTER_GAIN: mConeOuterGain = aParam; break;
131 default:
132 NS_ERROR("Bad PannerNodeEngine DoubleParameter");
133 }
134 }
135
136 virtual void ProcessBlock(AudioNodeStream* aStream,
137 const AudioChunk& aInput,
138 AudioChunk* aOutput,
139 bool *aFinished) MOZ_OVERRIDE
140 {
141 if (aInput.IsNull()) {
142 // mLeftOverData != INT_MIN means that the panning model was HRTF and a
143 // tail-time reference was added. Even if the model is now equalpower,
144 // the reference will need to be removed.
145 if (mLeftOverData > 0 &&
146 mPanningModelFunction == &PannerNodeEngine::HRTFPanningFunction) {
147 mLeftOverData -= WEBAUDIO_BLOCK_SIZE;
148 } else {
149 if (mLeftOverData != INT_MIN) {
150 mLeftOverData = INT_MIN;
151 mHRTFPanner->reset();
152
153 nsRefPtr<PlayingRefChangeHandler> refchanged =
154 new PlayingRefChangeHandler(aStream, PlayingRefChangeHandler::RELEASE);
155 aStream->Graph()->
156 DispatchToMainThreadAfterStreamStateUpdate(refchanged.forget());
157 }
158 *aOutput = aInput;
159 return;
160 }
161 } else if (mPanningModelFunction == &PannerNodeEngine::HRTFPanningFunction) {
162 if (mLeftOverData == INT_MIN) {
163 nsRefPtr<PlayingRefChangeHandler> refchanged =
164 new PlayingRefChangeHandler(aStream, PlayingRefChangeHandler::ADDREF);
165 aStream->Graph()->
166 DispatchToMainThreadAfterStreamStateUpdate(refchanged.forget());
167 }
168 mLeftOverData = mHRTFPanner->maxTailFrames();
169 }
170
171 (this->*mPanningModelFunction)(aInput, aOutput);
172 }
173
174 void ComputeAzimuthAndElevation(float& aAzimuth, float& aElevation);
175 float ComputeConeGain();
176 // Compute how much the distance contributes to the gain reduction.
177 float ComputeDistanceGain();
178
179 void GainMonoToStereo(const AudioChunk& aInput, AudioChunk* aOutput,
180 float aGainL, float aGainR);
181 void GainStereoToStereo(const AudioChunk& aInput, AudioChunk* aOutput,
182 float aGainL, float aGainR, double aAzimuth);
183
184 void EqualPowerPanningFunction(const AudioChunk& aInput, AudioChunk* aOutput);
185 void HRTFPanningFunction(const AudioChunk& aInput, AudioChunk* aOutput);
186
187 float LinearGainFunction(float aDistance);
188 float InverseGainFunction(float aDistance);
189 float ExponentialGainFunction(float aDistance);
190
191 virtual size_t SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const MOZ_OVERRIDE
192 {
193 size_t amount = AudioNodeEngine::SizeOfExcludingThis(aMallocSizeOf);
194 if (mHRTFPanner) {
195 amount += mHRTFPanner->sizeOfIncludingThis(aMallocSizeOf);
196 }
197
198 return amount;
199 }
200
201 virtual size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const MOZ_OVERRIDE
202 {
203 return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
204 }
205
206 nsAutoPtr<HRTFPanner> mHRTFPanner;
207 typedef void (PannerNodeEngine::*PanningModelFunction)(const AudioChunk& aInput, AudioChunk* aOutput);
208 PanningModelFunction mPanningModelFunction;
209 typedef float (PannerNodeEngine::*DistanceModelFunction)(float aDistance);
210 DistanceModelFunction mDistanceModelFunction;
211 ThreeDPoint mPosition;
212 ThreeDPoint mOrientation;
213 ThreeDPoint mVelocity;
214 double mRefDistance;
215 double mMaxDistance;
216 double mRolloffFactor;
217 double mConeInnerAngle;
218 double mConeOuterAngle;
219 double mConeOuterGain;
220 ThreeDPoint mListenerPosition;
221 ThreeDPoint mListenerFrontVector;
222 ThreeDPoint mListenerRightVector;
223 ThreeDPoint mListenerVelocity;
224 double mListenerDopplerFactor;
225 double mListenerSpeedOfSound;
226 int mLeftOverData;
227 };
228
229 PannerNode::PannerNode(AudioContext* aContext)
230 : AudioNode(aContext,
231 2,
232 ChannelCountMode::Clamped_max,
233 ChannelInterpretation::Speakers)
234 // Please keep these default values consistent with PannerNodeEngine::PannerNodeEngine above.
235 , mPanningModel(PanningModelType::HRTF)
236 , mDistanceModel(DistanceModelType::Inverse)
237 , mPosition()
238 , mOrientation(1., 0., 0.)
239 , mVelocity()
240 , mRefDistance(1.)
241 , mMaxDistance(10000.)
242 , mRolloffFactor(1.)
243 , mConeInnerAngle(360.)
244 , mConeOuterAngle(360.)
245 , mConeOuterGain(0.)
246 {
247 mStream = aContext->Graph()->CreateAudioNodeStream(new PannerNodeEngine(this),
248 MediaStreamGraph::INTERNAL_STREAM);
249 // We should register once we have set up our stream and engine.
250 Context()->Listener()->RegisterPannerNode(this);
251 }
252
253 PannerNode::~PannerNode()
254 {
255 if (Context()) {
256 Context()->UnregisterPannerNode(this);
257 }
258 }
259
260 size_t
261 PannerNode::SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const
262 {
263 size_t amount = AudioNode::SizeOfExcludingThis(aMallocSizeOf);
264 amount += mSources.SizeOfExcludingThis(aMallocSizeOf);
265 return amount;
266 }
267
268 size_t
269 PannerNode::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const
270 {
271 return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
272 }
273
274 JSObject*
275 PannerNode::WrapObject(JSContext* aCx)
276 {
277 return PannerNodeBinding::Wrap(aCx, this);
278 }
279
280 void PannerNode::DestroyMediaStream()
281 {
282 if (Context()) {
283 Context()->UnregisterPannerNode(this);
284 }
285 AudioNode::DestroyMediaStream();
286 }
287
288 // Those three functions are described in the spec.
289 float
290 PannerNodeEngine::LinearGainFunction(float aDistance)
291 {
292 return 1 - mRolloffFactor * (aDistance - mRefDistance) / (mMaxDistance - mRefDistance);
293 }
294
295 float
296 PannerNodeEngine::InverseGainFunction(float aDistance)
297 {
298 return mRefDistance / (mRefDistance + mRolloffFactor * (aDistance - mRefDistance));
299 }
300
301 float
302 PannerNodeEngine::ExponentialGainFunction(float aDistance)
303 {
304 return pow(aDistance / mRefDistance, -mRolloffFactor);
305 }
306
307 void
308 PannerNodeEngine::HRTFPanningFunction(const AudioChunk& aInput,
309 AudioChunk* aOutput)
310 {
311 // The output of this node is always stereo, no matter what the inputs are.
312 AllocateAudioBlock(2, aOutput);
313
314 float azimuth, elevation;
315 ComputeAzimuthAndElevation(azimuth, elevation);
316
317 AudioChunk input = aInput;
318 // Gain is applied before the delay and convolution of the HRTF
319 input.mVolume *= ComputeConeGain() * ComputeDistanceGain();
320
321 mHRTFPanner->pan(azimuth, elevation, &input, aOutput);
322 }
323
324 void
325 PannerNodeEngine::EqualPowerPanningFunction(const AudioChunk& aInput,
326 AudioChunk* aOutput)
327 {
328 float azimuth, elevation, gainL, gainR, normalizedAzimuth, distanceGain, coneGain;
329 int inputChannels = aInput.mChannelData.Length();
330
331 // If both the listener are in the same spot, and no cone gain is specified,
332 // this node is noop.
333 if (mListenerPosition == mPosition &&
334 mConeInnerAngle == 360 &&
335 mConeOuterAngle == 360) {
336 *aOutput = aInput;
337 return;
338 }
339
340 // The output of this node is always stereo, no matter what the inputs are.
341 AllocateAudioBlock(2, aOutput);
342
343 ComputeAzimuthAndElevation(azimuth, elevation);
344 coneGain = ComputeConeGain();
345
346 // The following algorithm is described in the spec.
347 // Clamp azimuth in the [-90, 90] range.
348 azimuth = min(180.f, max(-180.f, azimuth));
349
350 // Wrap around
351 if (azimuth < -90.f) {
352 azimuth = -180.f - azimuth;
353 } else if (azimuth > 90) {
354 azimuth = 180.f - azimuth;
355 }
356
357 // Normalize the value in the [0, 1] range.
358 if (inputChannels == 1) {
359 normalizedAzimuth = (azimuth + 90.f) / 180.f;
360 } else {
361 if (azimuth <= 0) {
362 normalizedAzimuth = (azimuth + 90.f) / 90.f;
363 } else {
364 normalizedAzimuth = azimuth / 90.f;
365 }
366 }
367
368 distanceGain = ComputeDistanceGain();
369
370 // Actually compute the left and right gain.
371 gainL = cos(0.5 * M_PI * normalizedAzimuth);
372 gainR = sin(0.5 * M_PI * normalizedAzimuth);
373
374 // Compute the output.
375 if (inputChannels == 1) {
376 GainMonoToStereo(aInput, aOutput, gainL, gainR);
377 } else {
378 GainStereoToStereo(aInput, aOutput, gainL, gainR, azimuth);
379 }
380
381 aOutput->mVolume = aInput.mVolume * distanceGain * coneGain;
382 }
383
384 void
385 PannerNodeEngine::GainMonoToStereo(const AudioChunk& aInput, AudioChunk* aOutput,
386 float aGainL, float aGainR)
387 {
388 float* outputL = static_cast<float*>(const_cast<void*>(aOutput->mChannelData[0]));
389 float* outputR = static_cast<float*>(const_cast<void*>(aOutput->mChannelData[1]));
390 const float* input = static_cast<float*>(const_cast<void*>(aInput.mChannelData[0]));
391
392 AudioBlockPanMonoToStereo(input, aGainL, aGainR, outputL, outputR);
393 }
394
395 void
396 PannerNodeEngine::GainStereoToStereo(const AudioChunk& aInput, AudioChunk* aOutput,
397 float aGainL, float aGainR, double aAzimuth)
398 {
399 float* outputL = static_cast<float*>(const_cast<void*>(aOutput->mChannelData[0]));
400 float* outputR = static_cast<float*>(const_cast<void*>(aOutput->mChannelData[1]));
401 const float* inputL = static_cast<float*>(const_cast<void*>(aInput.mChannelData[0]));
402 const float* inputR = static_cast<float*>(const_cast<void*>(aInput.mChannelData[1]));
403
404 AudioBlockPanStereoToStereo(inputL, inputR, aGainL, aGainR, aAzimuth <= 0, outputL, outputR);
405 }
406
407 // This algorithm is specified in the webaudio spec.
408 void
409 PannerNodeEngine::ComputeAzimuthAndElevation(float& aAzimuth, float& aElevation)
410 {
411 ThreeDPoint sourceListener = mPosition - mListenerPosition;
412
413 if (sourceListener.IsZero()) {
414 aAzimuth = 0.0;
415 aElevation = 0.0;
416 return;
417 }
418
419 sourceListener.Normalize();
420
421 // Project the source-listener vector on the x-z plane.
422 const ThreeDPoint& listenerFront = mListenerFrontVector;
423 const ThreeDPoint& listenerRight = mListenerRightVector;
424 ThreeDPoint up = listenerRight.CrossProduct(listenerFront);
425
426 double upProjection = sourceListener.DotProduct(up);
427 aElevation = 90 - 180 * acos(upProjection) / M_PI;
428
429 if (aElevation > 90) {
430 aElevation = 180 - aElevation;
431 } else if (aElevation < -90) {
432 aElevation = -180 - aElevation;
433 }
434
435 ThreeDPoint projectedSource = sourceListener - up * upProjection;
436 if (projectedSource.IsZero()) {
437 // source - listener direction is up or down.
438 aAzimuth = 0.0;
439 return;
440 }
441 projectedSource.Normalize();
442
443 // Actually compute the angle, and convert to degrees
444 double projection = projectedSource.DotProduct(listenerRight);
445 aAzimuth = 180 * acos(projection) / M_PI;
446
447 // Compute whether the source is in front or behind the listener.
448 double frontBack = projectedSource.DotProduct(listenerFront);
449 if (frontBack < 0) {
450 aAzimuth = 360 - aAzimuth;
451 }
452 // Rotate the azimuth so it is relative to the listener front vector instead
453 // of the right vector.
454 if ((aAzimuth >= 0) && (aAzimuth <= 270)) {
455 aAzimuth = 90 - aAzimuth;
456 } else {
457 aAzimuth = 450 - aAzimuth;
458 }
459 }
460
461 // This algorithm is described in the WebAudio spec.
462 float
463 PannerNodeEngine::ComputeConeGain()
464 {
465 // Omnidirectional source
466 if (mOrientation.IsZero() || ((mConeInnerAngle == 360) && (mConeOuterAngle == 360))) {
467 return 1;
468 }
469
470 // Normalized source-listener vector
471 ThreeDPoint sourceToListener = mListenerPosition - mPosition;
472 sourceToListener.Normalize();
473
474 // Angle between the source orientation vector and the source-listener vector
475 double dotProduct = sourceToListener.DotProduct(mOrientation);
476 double angle = 180 * acos(dotProduct) / M_PI;
477 double absAngle = fabs(angle);
478
479 // Divide by 2 here since API is entire angle (not half-angle)
480 double absInnerAngle = fabs(mConeInnerAngle) / 2;
481 double absOuterAngle = fabs(mConeOuterAngle) / 2;
482 double gain = 1;
483
484 if (absAngle <= absInnerAngle) {
485 // No attenuation
486 gain = 1;
487 } else if (absAngle >= absOuterAngle) {
488 // Max attenuation
489 gain = mConeOuterGain;
490 } else {
491 // Between inner and outer cones
492 // inner -> outer, x goes from 0 -> 1
493 double x = (absAngle - absInnerAngle) / (absOuterAngle - absInnerAngle);
494 gain = (1 - x) + mConeOuterGain * x;
495 }
496
497 return gain;
498 }
499
500 float
501 PannerNodeEngine::ComputeDistanceGain()
502 {
503 ThreeDPoint distanceVec = mPosition - mListenerPosition;
504 float distance = sqrt(distanceVec.DotProduct(distanceVec));
505 return (this->*mDistanceModelFunction)(distance);
506 }
507
508 float
509 PannerNode::ComputeDopplerShift()
510 {
511 double dopplerShift = 1.0; // Initialize to default value
512
513 AudioListener* listener = Context()->Listener();
514
515 if (listener->DopplerFactor() > 0) {
516 // Don't bother if both source and listener have no velocity.
517 if (!mVelocity.IsZero() || !listener->Velocity().IsZero()) {
518 // Calculate the source to listener vector.
519 ThreeDPoint sourceToListener = mPosition - listener->Velocity();
520
521 double sourceListenerMagnitude = sourceToListener.Magnitude();
522
523 double listenerProjection = sourceToListener.DotProduct(listener->Velocity()) / sourceListenerMagnitude;
524 double sourceProjection = sourceToListener.DotProduct(mVelocity) / sourceListenerMagnitude;
525
526 listenerProjection = -listenerProjection;
527 sourceProjection = -sourceProjection;
528
529 double scaledSpeedOfSound = listener->DopplerFactor() / listener->DopplerFactor();
530 listenerProjection = min(listenerProjection, scaledSpeedOfSound);
531 sourceProjection = min(sourceProjection, scaledSpeedOfSound);
532
533 dopplerShift = ((listener->SpeedOfSound() - listener->DopplerFactor() * listenerProjection) / (listener->SpeedOfSound() - listener->DopplerFactor() * sourceProjection));
534
535 WebAudioUtils::FixNaN(dopplerShift); // Avoid illegal values
536
537 // Limit the pitch shifting to 4 octaves up and 3 octaves down.
538 dopplerShift = min(dopplerShift, 16.);
539 dopplerShift = max(dopplerShift, 0.125);
540 }
541 }
542
543 return dopplerShift;
544 }
545
546 void
547 PannerNode::FindConnectedSources()
548 {
549 mSources.Clear();
550 std::set<AudioNode*> cycleSet;
551 FindConnectedSources(this, mSources, cycleSet);
552 }
553
554 void
555 PannerNode::FindConnectedSources(AudioNode* aNode,
556 nsTArray<AudioBufferSourceNode*>& aSources,
557 std::set<AudioNode*>& aNodesSeen)
558 {
559 if (!aNode) {
560 return;
561 }
562
563 const nsTArray<InputNode>& inputNodes = aNode->InputNodes();
564
565 for(unsigned i = 0; i < inputNodes.Length(); i++) {
566 // Return if we find a node that we have seen already.
567 if (aNodesSeen.find(inputNodes[i].mInputNode) != aNodesSeen.end()) {
568 return;
569 }
570 aNodesSeen.insert(inputNodes[i].mInputNode);
571 // Recurse
572 FindConnectedSources(inputNodes[i].mInputNode, aSources, aNodesSeen);
573
574 // Check if this node is an AudioBufferSourceNode
575 AudioBufferSourceNode* node = inputNodes[i].mInputNode->AsAudioBufferSourceNode();
576 if (node) {
577 aSources.AppendElement(node);
578 }
579 }
580 }
581
582 void
583 PannerNode::SendDopplerToSourcesIfNeeded()
584 {
585 // Don't bother sending the doppler shift if both the source and the listener
586 // are not moving, because the doppler shift is going to be 1.0.
587 if (!(Context()->Listener()->Velocity().IsZero() && mVelocity.IsZero())) {
588 for(uint32_t i = 0; i < mSources.Length(); i++) {
589 mSources[i]->SendDopplerShiftToStream(ComputeDopplerShift());
590 }
591 }
592 }
593
594
595 }
596 }
597

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