[Speex-dev] sharing a decoder between 2 inbound speex streams?

Matt DeMoss
Sun, 17 Jul 2005 09:44:09 -0000

What does it sound like if you try to use only one decoder state for
multiple streams?


Tom Grandgent wrote:

>You definitely need to have separate decoders for separate streams.
>It has been mentioned before that inter-frame state is critical to
>achieving the level of quality for bandwidth that Speex offers.  This
>differentiates it from iLBC, a codec whose claim to fame is that it
>treats each frame independently.
>
>I'm not sure what's hard about maintaining multiple decoder states,
>unless you are extremely resource-constrained or doing something
>unusual.  Normally all you have to do is create a decoder state for
>each new client and free it when the client is gone.
>
>
>
>>---- Original Message ----
>>From: tone@mailblocks.com
>>To: speex-dev@xiph.org
>>Subject: RE: [Speex-dev] sharing a decoder between 2 inbound speex
>>streams?
>>Date: Tue, 12 Jul 2005 16:03:02 -0400
>>
>>
>>
>>>This is a hard one to search for in the archives, and I checked the
>>>
>>>
>>FAQ
>>
>>
>>>and the PDFs.
>>>
>>>If a VOIP application wants to support the ability to output
>>>
>>>
>>multiple
>>
>>
>>>inbound streams (from separate senders who happened to choose the
>>>
>>>
>>same
>>
>>
>>>moment to start speaking), is it a requirement to have separate
>>>decoders for each, or could one be used in a round-robin manner to
>>>service packets from the multiple senders?
>>>
>>>I am guessing that I should use a separate decoder for each inbound
>>>stream of frames, and that there is significant inter-frame state
>>>maintained by the decoder, but the convenience of not having to have
>>>
>>>
>>a
>>
>>
>>>decoder free pool to dynamically allocate/deallocate these is
>>>motivation enough to ask!
>>>
>>>Tony Lovell
>>>http://dreadnoughtproject.org
>>>tone@dreadnoughtproject.org
>>>AIM: StupidLagger
>>>
>>>
>>>_______________________________________________
>>>Speex-dev mailing list
>>>Speex-dev@xiph.org
>>>http://lists.xiph.org/mailman/listinfo/speex-dev
>>>
>>>
>
>
>_______________________________________________
>Speex-dev mailing list
>Speex-dev@xiph.org
>http://lists.xiph.org/mailman/listinfo/speex-dev
>
>
>