[x264-devel] Motion Estimation

[Jason Garrett-Glaser]

On Mon, Jul 13, 2009 at 12:53 PM, David Smith<agentdavo at mac.com> wrote:
> OK,
> I am in the process of packing up dependencies so that I can pass the
> compute of x264_me_search_ref over to a PCIe x4 multi core DSP board with
> 2Gb global memory.  Assume a messaging system is already in place between
> the host PC and the dsp board.
> A function replicating x264_me_search_ref is running on DSP core
> 0 with job management that sends a x264_me_search_ref call to each core.
> I have been trying to figure out the data dependancy with Understand v2 /
> Netbeans and how other threads change, if at all, the current thread
> structures *h & *m.  Would it simply a case of copying the *h *m structures
> for each call of x264_me_search_ref over to the dsp board memory and
> returning them back at the end for each thread?  I assume that would be an
> unnecessarily large replication of data for each call per thread.
> How about if the structures are copied once on the first call per frame?
>  Would that be enough to satisfy the dependancy for the rest of the frame up
> until
> h->mb.i_mb_xy = h->m.i_mb_count
> Any thoughts or comments welcomed.
> Thanks,
> David.

You'll want to look through me_search_ref and refine_subpel and see
what parameters of note are used from x264_t.  x264_me_t is small and
should be copied.

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