theora dev - Aug 2006 - add theora_user_yuv_out(theora_state *, yuv_buffer *) to libtheora?

Hi,

I'd like to add user-allocated frame memory to theora via a
theora_user_yuv_out callback.  An additional helper function
(theora_user_buffer_is_freeable) would also be required.

With these two functions, user applications could submit memory
buffers directly to libtheora, which would reduce the number of frame
copies in a typical application from two per frame to one per frame.

I've summarised the problem in more detail and provided a couple of
alternative approaches at: http://trac.xiph.org/ticket/1081#preview.

What do people think of this idea / approach?

Cheers,
    -Shane Stephens

On Tue, Aug 29, 2006 at 01:30:24PM +1000, Shane Stephens wrote:
> I'd like to add user-allocated frame memory to theora via a
> theora_user_yuv_out callback.  An additional helper function
> (theora_user_buffer_is_freeable) would also be required.
I've responded in the bug report, which isn't optimal, but there you go.

 -r

On 8/29/06, Shane Stephens <shane.stephens@gmail.com>
wrote:
> Hi,
>
> I'd like to add user-allocated frame memory to theora via a
> theora_user_yuv_out callback.  An additional helper function
> (theora_user_buffer_is_freeable) would also be required.
I would object to adding this sort of thing to libtheora. Add it to
theora-exp instead - it's a cleaner API, a more complete AND more
correct implementation, and substantially faster.

I considered doing it in theora-exp in the past; the reason I didn't
do so at the time was that theora's internal frame representation
didn't match the output I needed (different strides, primarily), so I
was going to have to do a copy anyway.

Mike