[FFmpeg-devel] [RFC] AVComponentDescriptor and bit-streamed formats
Mon Mar 30 20:41:25 CEST 2009
On Mon, Mar 30, 2009 at 11:00:09AM +0200, Stefano Sabatini wrote:
> On date Monday 2009-03-30 10:25:40 +0200, Michael Niedermayer encoded:
> > On Mon, Mar 30, 2009 at 12:26:10AM +0200, Stefano Sabatini wrote:
> > > So the problem I'm having is with step+offset+shift.
> > >
> > > The variables I need for describing a bit-streamed format are:
> > > * plane
> > > * step (bits or bytes+remaining bits)
> > > * offset (bits or bytes+remaining bits)
> > > * depth
> > >
> > > Currently the only bit-streamed formats supported in FFmpeg are:
> > > BGR4, RGB4, MONOWHITE, MONOBLACK, and for these the ranges used for
> > > step and offset may suffice for interpreting those values as a number
> > > of *bits*, but for extensibility sake I think we should:
> > >
> > > * extend the range of the step and offset fields
> > > or
> > > * introduce new fields to express the step/offset remaining bits
> > > (maybe reusing shift)
> > >
> > > Once this is clear it should be fairly easy to complete the
> > so you want to extend things to support non existent cases?
> > no interest until you can provide a real and used pix format that needs
> > it
> No problem if you want to keep that way.
> So is it OK to interpret step and offset as a number of *bits* for
> bit-streamed formats?
Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
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