[Webkit-unassigned] [Bug 236363] New: (Safari 15 - iOS15): Increased audio latency on streaming via webrtc

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=236363

            Bug ID: 236363
           Summary: (Safari 15 - iOS15):  Increased audio latency on
                    streaming via webrtc
           Product: WebKit
           Version: Safari 15
          Hardware: iPhone / iPad
                OS: iOS 15
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebRTC
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: asanand at nvidia.com
                CC: youennf at gmail.com

We are observing noticeable increase in audio latency in Safari browser iOS 15.4 beta.

Our Client side implementation plays webrtc audio/video stream received from server on video element.


We have looked in the mediaserverd logs(presented below) and here is our finding



default 12:34:35.138370+0530    mediaserverd    -CMVAEndptMgr- vaemSetDeviceBufferDuration: duration = 0.085, sampleRate = 48000.000, numPCMSamples = 4095, NearestPowerOf2 = 4096, UseQuietBufferSizeProperty = ‘NO’


When we play the same after enabling the "AudioContext", we are getting following log

default 12:42:35.257580+0530    mediaserverd    -CMVAEndptMgr- vaemSetDeviceBufferDuration: duration = 0.003, sampleRate = 48000.000, numPCMSamples = 127, NearestPowerOf2 = 128, UseQuietBufferSizeProperty = ‘NO’

the numPCMSamples in case of AudioContext is reducing down to 127 and its having direct impact on our audio latency.

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