[opus] opus 1.2.1 regression with --enable-float-approx and --0fast

[Jean-Marc Valin]

Hi Stepan,

I would need more information to be able to investigate further. It's
legal for the decoder to output -32768, so it would be good if you could
explain how this is unexpected. Ideally an audio file with details on
how to reproduce the problem would help.

Optionally, if you could bisect the git repo to see where the problem
started.

Cheers,

	Jean-Marc

On 02/22/2018 07:15 PM, Stepan Salenikovich wrote:
> Hi,
> I work on a webRTC application and recently tried updating from opus
> 1.1.5 to 1.2.1
> 
> Afterwards I noticed occasionally weird audio glitches. I finally
> tracked down the issue to the opus decoder in my application outputting
> samples with the value of -32768.
> 
> This behaviour stopped when reverting to opus 1.1.5 or compiling opus
> 1.2.1 without configuring --enable-float-aprox and --0fast.
> 
> The setup is a microphone as audio input into chrome v64 which then
> sends opus encoded audio to my application and my application decoding
> this audio stream.
> 
> I could induce the glitches by breathing/blowing really loudly into the
> microphone. I noticed that occasionally this would result in the opus
> decoder in my application to keep outputting a stream of -32768 (even if
> I stopped) until I talked normally for a bit.
> 
> Is it possible that a regression was introduced between 1.1.5 and 1.2.1
> when configuring with --enable-float-approx and compiling with --0fast?
> 
> Thanks,
> -stepan
> 
> 
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