Icecast dev - May 2010 - libshout2 with aac

On 17 May 2010, at 22:42, Romain Beauxis <toots at rastageeks.org> wrote:
> Le lundi 17 mai 2010 23:36:53, Jamie Bullock a ?crit :
>> On 17 May 2010, at 21:07, Geoff Shang wrote:
>>> On Mon, 17 May 2010, Jamie Bullock wrote:
>>>
>>>
>>>> I'm write an icecast source client and I'd like to
support
>>>> streaming of
>>>> AAC encoded files.
>>>>
>>>>
>>>>
>>>> Can anyone tell me if and how this can be achieved with
>>>> libshout2/icecast?
>>>
>>>
>>>
>>> I can't tel you as I don't know, but Ices0 can do AAC
(IIRC) so
>>> you could
>>> look there.
>>
>> AFAICT, ices re-encodes the audio to MP3 before streaming. So we  
>> have AAC
>> -> PCM -> MP3. Seems a bit of a waste of CPU --
>>
>> I wonder if it is possible to stream AAC 'directly
>
> No it is not because libshout cannot send a custom mime-type  
> (content-type)
> header.
>
Ah OK, what should the mime-type be for AAC? I might be able to hack  
something.

Jamie

Le mardi 18 mai 2010 00:27:50, Jamie Bullock a ?crit :
> Ah OK, what should the mime-type be for AAC? I might be able to hack  
> something.
"audio/aac" for AAC, "audio./aacp" for AAC+..

Then, you also need to use the lib in raw mode and do the synchronization of 
the sending yourself.

Romain

Romain Beauxis:
> Then, you also need to use the lib in raw mode and do the synchronization
of
> the sending yourself.
>   
aac/aac+ streamed with ADTS headers, most players don't need
synchronized streams.