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List Info
Thread: G726
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| G726 |
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2007-02-16 16:19:21 |
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gi guys,
i was looking at codec_g726.c and i've been to ask myself: what are the differences between g726 and g726aal2.
They both use the same struct g726_coder_pvt. They both using g726tolin_sample(), which is 2 samples/bytes
Also, a core show translation seems they are really fast to translate from one to other.
Is that just a small difference in the algo, like g711u vs g711a?
Also, the module description says: ITU G.726-32kbps G726 Transcoder, isnt for 16-24 and 40 too?
--
Clod Patry
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| RE: G726 |
 
United States |
2007-02-16 16:56:21 |
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| I think that the sample packing order is different between
g726 and g726aal2.
And yes, it's the 32kbps (4 bits per sample) encoding
only.
gi guys,
i was looking at codec_g726.c and i've been to ask
myself: what are the differences between g726 and g726aal2.
They both use
the same struct g726_coder_pvt. They both using g726tolin_sample(), which is 2
samples/bytes
Also, a core show translation seems they are really fast to
translate from one to other.
Is that just a small difference in the algo,
like g711u vs g711a?
Also, the module description says: ITU
G.726-32kbps G726 Transcoder, isnt for 16-24 and 40 too?
--
Clod Patry |
| Re: G726 |
United States |
2007-02-16 17:45:01 |
Steve Langstaff wrote:
> I think that the sample packing order is different
between g726 and
> g726aal2.
That is correct, it is essentially little-ending vs.
big-ending packing
of the encoded bits into bytes. That is why converting
between them is
so fast.
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| Re: G726 |
 
United Kingdom |
2007-02-20 17:12:23 |
On 16 Feb 2007, at 23:45, Kevin P. Fleming wrote:
> Steve Langstaff wrote:
>> I think that the sample packing order is different
between g726 and
>> g726aal2.
>
> That is correct, it is essentially little-ending vs.
big-ending
> packing
> of the encoded bits into bytes. That is why converting
between them is
> so fast.
1.4/include/asterisk/frame.h has this as:
/*! ADPCM (G.726, 32kbps, RFC3551 codeword packing) */
#define AST_FORMAT_G726 (1 << 11)
But
http://www.ietf.org/internet-drafts/draft-guy-iax-02.txt
under
Media Format Subclass Values
says:
0x00000800 | AMR | Variable
- All of the rest of the codecs match.
Is this a bug in asterisk or in the draft-rfc ?
Or are we putting a translation layer between the values IAX
uses
externally
and that asterisk uses internally?
Tim.
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Tim Panton
www.mexuar.net
www.westhawk.co.uk/
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| Re: G726 |
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2007-02-21 04:58:33 |
On Wed, Feb 21, 2007 at 10:55:50AM +0000, Dorian Logan
wrote:
> Can the AMR Codecs be purchased? If so where from?
Voiceage, last time I was involved with a project for
licensing it,
it was around $50K set-up fee and then $2 an encoder and $1
a decoder
with a minimum of $20K.
Steve
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steve gbnet.net
Euro Tech News Blog http://eurotechnews.
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