[Speex-dev] frame size for a given quality?

[Jeff Ramin]

Thanks again Steve. I'll search for the term you mention below.

What I really want is to take the output of the speex encoder and spit
it out on the network via RTP. I haven't been able to find a library or code
example that does that.


On 11/01/2010 12:03 PM, Steve Kann wrote:
> Jeff,
>
>   It's in the manual:
>
> http://www.speex.org/docs/manual/speex-manual/node10.html  (table 3 and 4).
>
> However, if you're asking this, you're probably trying to do something
> wrong, or the hard way.  You probably shouldn't be taking speex output,
> and trying to "count bytes".   If you are using the API, then you will
> just get the bits out, and then you'll know how many you have.
>
> If you're trying to stream an existing stream of speex-encoded bits, then
> it's pretty trivial to parse the stream.  I wrote something to do that a
> long time ago (google speex_get_bits), though it may not do exactly what
> you want.
>
> -SteveK
>
>
>
>
>
>
> On 11/1/10 10:44 AM, "Jeff Ramin"<jeff.ramin at singlewire.com>  wrote:
>
>> Thanks Steve.
>>
>> Is there a document anywhere that shows how many bytes/bits of data
>> are produced by the speex encoding process for a given amount of time
>> sampling rate and quality setting?
>>
>>
>> On 11/01/2010 09:41 AM, Steve Kann wrote:
>>> Jeff,
>>>
>>>    RFC-5574 is standards-track:  http://tools.ietf.org/html/rfc5574  so,
>>> while it's not an approved standard, it's more standardized than a lot
>>> of
>>> interoperable traffic on the internets these days.
>>>
>>>    The RFC specifies packetization guidelines, which is basically that
>>> you
>>> put one or more frames in a packet, and then pad the rest with 0 bits
>>> until you have a while number of octets.
>>>
>>> -SteveK
>>>
>>>
>>>
>>> On 11/1/10 9:55 AM, "Jeff Ramin"<jeff.ramin at singlewire.com>   wrote:
>>>
>>>> I need to stream speex-encoded audio over RTP, which doesn't seem
>>>> to be standardized yet, so I'm gonna roll my own code. I control both
>>>> the
>>>> sending and receiving sides, so I can pretty much do what I want.
>>>>
>>>> I want each packet to contain 20ms worth of audio (sampled at 8KHz),
>>>> and I'm encoding using a constant bit rate and quality:6.
>>>>
>>>> Q: how do I determine how many bytes of data go into each packet? I'm
>>>> putting one frame (20 ms) into each packet.
>>>>
>>>> Thanks!
>>>>
>>>> -- 
>>>> Jeff Ramin
>>>> Software Engineer
>>>> Singlewire Software
>>>> 2601 W Beltline Hwy #510
>>>> Madison, WI 53713
>>>>
>>>> Phone Direct - 608.661.1172
>>>> www.singlewire.com
>>>>
>>>> _______________________________________________
>>>> Speex-dev mailing list
>>>> Speex-dev at xiph.org
>>>> http://lists.xiph.org/mailman/listinfo/speex-dev
>>
>> -- 
>> Jeff Ramin
>> Software Engineer
>> Singlewire Software
>> 2601 W Beltline Hwy #510
>> Madison, WI 53713
>>
>> Phone Direct - 608.661.1172
>> www.singlewire.com
>>
>


-- 
Jeff Ramin
Software Engineer
Singlewire Software
2601 W Beltline Hwy #510
Madison, WI 53713

Phone Direct - 608.661.1172
www.singlewire.com