[gst-devel] mp3 decoder

[Edward Hervey]

Let me rephrase it in another way:
  The most efficient way to use libmad with GStreamer is how it's being
done in the mad gstreamer plugin.

If you want to do it another way you're:
 1. looking for trouble
 2. doubling your work
 3. going to end up with a really inefficient plugin

Why do you want to load everything in memory ? What's going to happen if
I give it a one hour podcast ? you're going to load the 60Mbytes in
memory.

   Edward

On Wed, 2008-11-19 at 17:21 +0530, Gnanasekar wrote:
> No , I am not .I am not going to do in the same way as mad used libmad
> decoder.
> I was planned to dump the whole data (each 4K) in to a single buffer
> and passing that 
> buffer to decoder_init function of libmad which is doing decode
> oparation and processing those stuffs.Because decoder_int takes whole
> size of the source file(thats why i have been transfered all 4K's to a
> single  buffer).
> 
> So my functionality is goes like this,
> 
> filesrc -> passing 4K for each iteration 
> Gbuf   -> my own buffer for holding all 4K's in a single buffer
> decoder_init(&Gbuf) -> passing Gbuf to decoder_init (libmad function)
> input ,output,error -> these are callback functions which is defined
> in libmad.I am using all these call back functions altogether with
> this decode of libmad.
> 
> whether my flow is fine or any changes needed in the flow?
> 
> Thanks and Regards,
> SK.Gnanasekar
> 
> 
> 
> 
> Edward Hervey wrote: 
> > So...
> > 
> >   Let me get this right. You want to create your own plugin using
> > 'libmad' and for that you're looking at the code from the mad plugins
> > which ... already uses 'libmad'.
> > 
> >   You realize you're trying to do the EXACT SAME THING as the mad
> > plugin ?
> > 
> >     Edward
> > 
> > 
> > On Wed, 2008-11-19 at 14:59 +0530, Gnanasekar wrote:
> >   
> > > Hi all,
> > > 
> > >           I am working on developing plug-in for mp3.From the help of 
> > > mad plugin i found some of the ideas.from this what i came to know is 
> > > filesrc is getting an every 4K of data and passing it to chain function 
> > > of mad plugin.Here in chain this 4K is processed in some manner and 
> > > pushed to ( gst_pad_push (filter->srcpad, buf) ) source pad.
> > > 
> > >           But the thing is that i dont want to use this mad .. i have to 
> > > use my own plugin for mp3 decoder ... for this i found a decoder called 
> > > libmad. which is having some decoding algorithm.
> > > But it is getting data as a single buffer of whole data.
> > > 
> > >           My query is that
> > >          1. how to pass whole data from filesrc to plugin decoder?
> > >          2. how to use libmad in my plugin ?
> > >          3. how to pass output of decoded data to alsasink or osssink ?
> > > 
> > > Thanks and regards,
> > > SK.Gnanasekar,
> > > 
> > >          
> > > 
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