65 lines
2.8 KiB
Objective-C
65 lines
2.8 KiB
Objective-C
#import "DesiredBufferDepthController.h"
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#import "PreferencesUtil.h"
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#import "Util.h"
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#import "AudioPacker.h"
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#define MAX_DESIRED_FRAME_DELAY 12
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#define MIN_DESIRED_FRAME_DELAY 0.5
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#define DROPOUT_THRESHOLD 10
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#define DESIRED_BUFFER_DEPTH_DECAY_RATE 0.01
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@implementation DesiredBufferDepthController
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+(DesiredBufferDepthController*) desiredBufferDepthControllerForJitterQueue:(JitterQueue*)jitterQueue {
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require(jitterQueue != nil);
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NSTimeInterval audioDurationPerPacket = (NSTimeInterval)(AUDIO_FRAMES_PER_PACKET*[SpeexCodec frameSizeInSamples])
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/ SAMPLE_RATE;
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double initialDesiredBufferDepth = Environment.preferences.getCachedOrDefaultDesiredBufferDepth;
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DropoutTracker* dropoutTracker = [DropoutTracker dropoutTrackerWithAudioDurationPerPacket:audioDurationPerPacket];
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DecayingSampleEstimator* decayingDesiredBufferDepth =
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[DecayingSampleEstimator decayingSampleEstimatorWithInitialEstimate:initialDesiredBufferDepth
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andDecayPerUnitSample:DESIRED_BUFFER_DEPTH_DECAY_RATE];
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DesiredBufferDepthController* result = [DesiredBufferDepthController new];
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result->dropoutTracker = dropoutTracker;
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result->decayingDesiredBufferDepth = decayingDesiredBufferDepth;
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result->desiredDelayLogger = [Environment.logging getValueLoggerForValue:@"desired buffer depth" from:self];
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[jitterQueue registerWatcher:result];
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return result;
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}
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-(double) getAndUpdateDesiredBufferDepth {
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double r = decayingDesiredBufferDepth.currentEstimate;
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[decayingDesiredBufferDepth updateWithNextSample:[dropoutTracker getDepthForThreshold:DROPOUT_THRESHOLD]];
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[decayingDesiredBufferDepth forceEstimateTo:[NumberUtil clamp:decayingDesiredBufferDepth.currentEstimate
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toMin:MIN_DESIRED_FRAME_DELAY
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andMax:MAX_DESIRED_FRAME_DELAY]];
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[desiredDelayLogger logValue:r];
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return r;
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}
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-(void) notifyArrival:(uint16_t)sequenceNumber {
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[dropoutTracker observeSequenceNumber:sequenceNumber];
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}
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-(void) notifyBadArrival:(uint16_t)sequenceNumber ofType:(enum JitterBadArrivalType)arrivalType {
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}
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-(void) notifyBadDequeueOfType:(enum JitterBadDequeueType)type {
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}
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-(void) notifyDequeue:(uint16_t)sequenceNumber withRemainingEnqueuedItemCount:(NSUInteger)remainingCount {
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}
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-(void) notifyResyncFrom:(uint16_t)oldReadHeadSequenceNumber to:(uint16_t)newReadHeadSequenceNumber {
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}
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-(void) notifyDiscardOverflow:(uint16_t)sequenceNumber resyncingFrom:(uint16_t)oldReadHeadSequenceNumber to:(uint16_t)newReadHeadSequenceNumber {
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}
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-(void) terminate {
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[Environment.preferences setCachedDesiredBufferDepth:decayingDesiredBufferDepth.currentEstimate];
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}
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@end
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