[Speex-dev] Re: compatibility issues.

ALEX NG alex at gorex.com.hk
Fri May 25 07:58:27 PDT 2007

I plan to setup linux server  and in client side, XP and Linux.
Also, in order to collect the voice, I plan to use portaudio to collect, say 
20ms as you suggested sample and feed to the speex encoder.  For easier 
implementation, I don't use OGG container, and just encode then send to the 
spread network to the client.
Hope this work.  Can you advise any potential problems by this approach?
----- Original Message ----- 
From: "Jim Crichton" <jim.crichton at comcast.net>
To: <alex at gorex.com.hk>
Cc: <greg at mytantrum.com>; <speex-dev at xiph.org>
Sent: Friday, May 25, 2007 10:31 PM
Subject: Re: [Speex-dev] Re: compatibility issues.

> For a streaming application like VOIP, you collect 20 ms of samples, feed 
> this through the encoder, stick it in an RTP packet, and send if over the 
> network.  On the receive side you feed packets through a jitter buffer to 
> the decoder, and then copy the output audio to your output device.  Speex 
> runs efficiently on most compilers, so the real-time requirement is not a 
> big deal, as long as you know how to do this with your operating system 
> (if you have one).
> You do not need Ogg containers for something like this, just search the 
> archives for RTP references and you will find much more.
> Look at the SpeexClient application provided in the source tree, and at 
> the testenc examples in the libspeex directory.  The Speex part of things 
> is pretty easy (thanks to Jean-Marc).  It is the audio interface for your 
> specific platform and the call setup protocals (e.g. SIP) where the real 
> work is.
> If you identify the specific hardware/software platform that you plan to 
> use, then someone may be able to point you to examples for the audio 
> interface software.
> - Jim
> ----- Original Message ----- 
> From: <alex at gorex.com.hk>
> To: "Greg" <caroundw5h at yahoo.com>
> Cc: <greg at mytantrum.com>; <speex-dev at xiph.org>; "Jean-Marc Valin" 
> <jean-marc.valin at usherbrooke.ca>
> Sent: Thursday, May 24, 2007 11:30 PM
> Subject: Re: [Speex-dev] Re: compatibility issues.
>> HI,
>>  I am also working on VOIP application.
>> Now the speexenc.exe is used to encode a wav/raw file.  However, in real 
>> time
>> voice communication, the voice keep recording from the microphone and how 
>> can
>> we employ speex to compress the voice and send over the network?
>> Thanks
>> Quoting Greg <caroundw5h at yahoo.com>:
>>> okay that questioned is answered, thank you.
>>> I am interested in using speex in a VOIP application. do i need to put 
>>> it in
>>> into
>>> the ogg contianer format in order to encode/decode and send it? or will 
>>> it
>>> work
>>> "as is"? if the latter then:
>>>  "the packet is larger than the allocated buffer" message: whats your
>>> recomendaton for fixing that? i was thinking simply getting the size of 
>>> the
>>> frame
>>> and using the speex_bits_init_buffer() function to create a bigger 
>>> buffer.
>>> However i
>>> want to keep latency in mind and make them as small as possible.
>>> i apologise if the questions seem simple but i've working at this for 
>>> sevreal
>>> days
>>> and i'm a little stump. a indication in the right direction would be 
>>> helpful.
>>> thank you in advance,
>>> greg
>>> Jean-Marc Valin <jean-marc.valin at usherbrooke.ca> wrote: > does this have
>>> anything to do with the message on the example code:
>>> > "the packing used is not compatible with speexenc/speexdec" i know it
>>> > may sound stupid but it is my first time using speex lib. as well i
>>> > had assumed this was so and tweaked the decoder code to decode the
>>> > same file that the example encode code made, but i get a "packet is
>>> > larger than allocated buffer could not resize buffer, truncating
>>> > input" message.
>>> Well, the note says it all. It's just not compatible. speexenc/dec pack
>>> Speex data into an Ogg container, while the sampleenc/dec code just
>>> creates an incompatible ad-hoc format just to demonstrate how to use
>>> Speex (without bothering with the heavy Ogg code).
>>>  Jean-Marc
>>> ---------------------------------
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