[FFmpeg-devel] [PATCH] lavdevice: SDL Audio Playback
Thu Dec 10 22:58:38 CET 2009
On Thu, Dec 10, 2009 at 08:33:23PM +0100, Stefano Sabatini wrote:
> On date Wednesday 2009-12-09 22:50:30 +0100, Michael Niedermayer encoded:
> > On Tue, Dec 08, 2009 at 02:56:48PM +0100, Ivo wrote:
> > > Video out formats should have functions
> > > like draw_osd, get_buffer (for direct rendering) and flip_page. If
> > > write_packet is used/defined to write full frames, something like
> > > draw_slice would be useful too. Both video and audio out formats need a
> > > control function to control for example hardware treble/bass/volume/pan or
> > > hardware chroma/luma/saturation etc.. Also, a function to capture events
> > > (IR remote control, keypresses, mouse movements) and send them back to the
> > > application would be useful too. Perhaps by calling a user supplied
> > > callback function that processes the event.
> > You seem to be thinking of writing video out based on the muxer API, this
> > is an option for sure. But maybe avfilters are more appropriate as they
> > already have direct rendering & slice support. Also control commands
> > could be easily intercepted by a brightness changing filter when the hardware
> > doesnt support it.
> > but above all, we need ffplay updated for whichever system is choosen or we
> > wont have a player to test anything ...
> > Also we should try to reuse existing code if at all possible, like mplayers
> > video and audio out. Rewriting all the video outs from mplayer is just
> > the most brain amputated thing someone could attempt.
> > In that sense id like to mention it would be nice if mplayers video filters
> > could be supported by libvafilter. Porting them one by one is silly as well.
> > Someone should write code to use them unchanged its a lot more gain per work
> Maybe a vf_libmpcodecs.c filter?
yes but it needs a shorter name, a chain of libmpcodecs filters should not
end up being twice as long as in mplayer, each filter being prefixed by
Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
Republics decline into democracies and democracies degenerate into
despotisms. -- Aristotle
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