[gst-devel] mediatypes for AMR

[Stefan Kost]

hi,
Quoting Thomas Vander Stichele <thomas at apestaart.org>:

> On Tue, 2007-05-08 at 08:50 +0200, Stefan Kost wrote:
>> hi,
>>
>> while updating the media type in PWG I discovered that imho the
>> mediatypes for AMR are "unusual".
>> 1.) Since when do we use uppercase ?
>> 2.) Why is there: "audio/amr","audio/AMR","audio/AMR-WB"
>
> http://www.iana.org/assignments/media-types/audio/
>
> mime types for amr and amr-wb have the second part in upper case.

thanks for the link. Its quite ugly given that they also have  
"amr-wb+" in lowercase and in gstreamer we have extra fields.

>
> There are some people that say that we try to stick to mime types when
> we can and some people that say we shouldn't interpret them as mime
> types.
>
> There are some people that say that GStreamer should be able to figure
> out mime types correctly from files.  Maybe gst-typefind does that, and
> maybe it gives the GStreamer type, which may or may not be the mime
> type.  Confused yet ?
>
> Speaking generically, I would love for GStreamer to be able to detect
> the mime type of a stream, and I would love for it to be possible to get
> the mime type of a stream so I can put it in an SDP file without special
> logic.  The latter currently is possible afaict because all of the caps
> names are close enough to mime types for the codecs affected - including
> amr.

one we should add a mime field to caps, so that we don't need to  
restrict ourselves to sometimes ugly mime-type names.

Stefan

>
> Thomas
>
>>
>> If there is "audio/amr-wb", then "audio/amr" should be "audio/amr-nb".
>> On the other hand imho we could stick to "audio/amr" and use:
>> * amrversion="{nb,wb}"
>> * use the rate=8000/16000
>> to differenciate.
>>
>> As amrwb is still in -bad I guess its okay to change it there. What
>> are you thinking about it? Should we also add the lowercase version to
>> amrnb and mark the uppercase as deprecated (the lowercase ne could get
>> the armversion attribute too).
>>
>> Stefan
>>
>>
>>
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