[FFmpeg-devel] AMR-WB+ support in Ffmpeg

[Diego Biurrun]

On Tue, Dec 16, 2008 at 07:37:06PM -0500, Igor Gueths wrote:
> On Wed, Dec 17, 2008 at 12:43:41AM +0100, Diego Biurrun wrote:
> > On Tue, Dec 16, 2008 at 12:04:08AM -0500, Igor Gueths wrote:
> > > On Mon, Dec 15, 2008 at 11:17:53AM +0100, Benoit Fouet wrote:
> > > > 
> > > > On 12/15/2008 08:07 AM, Igor Gueths wrote:
> > > > > Hi all. I was attempting to add AMR-WB+ support into my working copy of R-16140;
> > > > 
> > > > AMR support in FFmpeg is done through libamr [1] which is included in
> > > > most distros today (libamrnb-dev and libamrwb-dev), that's why configure
> > > > checks for their existences. If you build it manually, you have to make
> > > > it possible to locate it.
> > > > Also, AFAIK, libamr does not support WB+ at the moment...
> > > 
> > > I see what you are saying. So in this case, it is probably better to handle WB+
> > > support within the existing libamr wrapper library, in which case I will contact
> > > the developer, to see if there is anything I need to absolutely keep in mind
> > > before attempting an integration of WB+ into that library.
> > 
> > AFAIK the reference code is not developed further.  Ideally you should
> > add AMR-WB and AMR-WB+ support to FFmpeg.
> 
> Out of curiosity, where did you determine that the code was possibly going
> unmaintained?

The last time I looked at the reference code download, the last version
was old.  No, I don't have hard facts.

> Regarding AMR-WB and AMR-WB+ support, as far as I can tell, the
> two codebases seem pretty compatible with each other. Consequently, I wouldn't
> find it out of the ordinary if AMR-WB+ was either partially or fully compatible
> with AMR-WB; I have not managed to fully verify this as of yet though. The
> AMR-WB+ zip archive structure is also a little bit different, in that they
> include Win32 binaries for the encoder and decoder, along with a DLL
> (er-libisomedia.dll), a static version of the same library with a .lib
> extension, and also some static library called 3gplib.lib as well. Some further
> investigation is going to be required into exactly what role these libraries
> play in the encoding and decoding processes.

Is there a reference decoder for AMR-WB+ now?  Where?

Diego