[FFmpeg-devel] [PATCH]Lagarith: CODEC_CAP_DR1 ?

[Reimar Döffinger]

On Sun, Jan 09, 2011 at 01:39:49AM +0100, Luca Barbato wrote:
> On 01/08/2011 11:09 PM, Carl Eugen Hoyos wrote:
> > Attached patch is necessary to make FFmpeg's lagarith decoder work with 
> > MPlayer.
> 
> what breaks otherwise?

I'd like to know that as well, but I suspect that MPlayer dislikes that
AFAICT the decoder does not set buffer_hints, which at least is suboptimal
and should be fixed anyway.
I think all that is necessary is adding
c->pic.buffer_hints = FF_BUFFER_HINTS_VALID;
since AFAICT the decoder does not do any reads at all from the buffer.
Note that this is very useful to set, since this means a player could
return a buffer in video ram that can be _very_ slow to read, whereas without
the buffer hints it can't know that (it knows it is not a reference frame,
but the decoder could still read data from the buffer while decoding a frame).