After 10.7.4 digital audio loops when we stop feeding CoreAudio new samples.

Originator:tobias
Number:rdar://11679310 Date Originated:
Status:Open Resolved:
Product:MacOSX Product Version:10.7.4
Classification:Serious Reproducible:Always
 
15-Jun-2012 01:03 PM Tobias Hieta:
Summary:

In our application Plex (based on XBMC), we see that users who have upgraded to 10.7.4 are having problems with digital audio over HDMI. When playing a movie that outputs AC3 or DTS audio over HDMI audio is looped when pressing pause.

Steps to Reproduce:

Play Digital Audio (via CoreAudio) to the HDMI port, stop writing new audio frames to the interface without closing down the connection.

Expected Results:

Silence.

Actual Results:

Last sample loops over and over again until we either write new samples or you close the connection.

Regression:

Bug only happens on 10.7.4 with HDMI port. Other version of MacOSX doesn't seem affected and it works as expected over Optical Audio.

Notes:

Our code is open source and available at github: https://github.com/elan/plex/blob/laika/xbmc/cores/AudioRenderers/CoreAudioRenderer.cpp

And: https://github.com/elan/plex/blob/laika/xbmc/osx/CoreAudio.cpp

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