On Tue, 28 May 2013, Kostya Shishkov wrote:

On Tue, May 28, 2013 at 12:21:44PM +0300, Martin Storsjö wrote:
On Tue, 28 May 2013, Kostya Shishkov wrote:

On Tue, May 28, 2013 at 11:25:58AM +0300, Martin Storsjö wrote:
From: Michael Niedermayer <[email protected]>

The existing implementation had little to do with VC1.

http://26-26-54.hardwarebug.org/33

This could be implemented by adjusting the reference frames
ithemselfs but that would make frame multi-threading difficult.
---
libavcodec/vc1.c    |   91 ++++++++++++++++++++++++++++++++++++++++-----------
libavcodec/vc1.h    |    8 +++--
libavcodec/vc1dec.c |   49 ++++++++++++++++++---------
3 files changed, 111 insertions(+), 37 deletions(-)

In general looks WTFy. Maybe (I cannot say even with 80% certainity) it tries
to deal with the fact there's intensity compensation defined in 8.3.8 and
10.3.8 and it mandates that intensity-compensated reference frame is used for
the subsequent fields/B-frames too but that's not obvious from the code or 
commit
message.

Ok, so what would be the right course of action? Patches 2-3 that
you ok'd depend pretty much on this change. Should I try to split
this patch into smaller pieces to get the parts that patches 2-3
depend on separated, or would this one just be less WTFy with a
seriously amended commit message?

The latter would do for me.

Right, so e.g.:

---8<---
vc1dec: Redesign the intensity compensation

Use the intensity-compensated reference frame for subsequent
fields/B-frames.

This could be implemented by adjusting the reference frames
themselves but that would make frame multi-threading difficult.
---8<---

// Martin
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