[Ffmpeg-devel] Some more thoughts about libavfilter

[Luca Abeni]

Hi Michael,

On Tue, 2007-01-09 at 01:51 +0100, Michael Niedermayer wrote:
[...]
> > 2) The "last" filter who use the AVFrame buffer is responsible for
> > freeing it.
[...]
> what if there are several Fout? (several outputs)
You are right. I forgot to mention that using this mechanism a single
frame buffer cannot be pushed to two different output filters, and a
copy is needed for the second output (well, I had something similar
witten on my old notes, but it was too confused and I skipped it :).

If this additional copy is not acceptable, then I think refcounting is
the only way to go (or am I missing some other possible solution?).
Is it acceptable to add a reference_count field in AVFrame? (or should
the "opaque" field be used?). An alternative would be to use an
"extended avframe" structure defined as
{
  FF_COMMON_FRAME;
  int reference_count
}


			Thanks,
				Luca
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