[Speex-dev] Plain Speex, or GStreamer?

Joshua Gargus schwa at fastmail.us
Mon May 5 22:03:02 PDT 2008

On May 5, 2008, at 6:58 PM, Jean-Marc Valin wrote:

> Joshua Gargus wrote:
>> Our app needs to support multiple media types, so GStreamer would  
>> seem
>> to be the obvious choice.  However, voice quality is paramount for
>> us.  Are there any disadvantages to using the Speex plugin for
>> GStreamer as opposed to directly coding to the Speex API?
> Don't know gstreamer well, but I assume that not all encoding options
> are supported in gstreamer. If you only want the standard options  
> (which
> is what I recommend unless you *know* you want something else), it
> should be the same. The decoder will likely work the same.

I think that the standard options should be fine.
>> In
>> particular, does the GStreamer element fully support the echo-
>> cancellation and jitter-buffer features of Speex?
> I highly doubt it.

You're right (as confirmed by grepping the Speex-GStreamer sources).   

>> Are there any other
>> pitfalls that a naive developer (and new to both APIs) should be  
>> aware
>> of?
> I assume your application is VoIP or something vaguely similar.

It's a virtual environment with VoIP built in.  GStreamer is  
attractive because we eventually want to have lip-synced video.

> In that
> case, the hardest thing to get right is doing the soundcard capture  
> and
> playback without having a huge buffer, not getting xruns (skips).

Thanks, I'll make sure that I test for those.


> 	Jean-Marc

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