[mpeg2-dev] Buffer Queues and libmpeg2

[Martin H. <mar...@ma...>]

Hi,

I am currently experimenting with libmpeg2 for use in a video player
project. I am currently using it straight out of the box and it works
fine. When the decoder is finished and gives me back a display picture I
just copy the display_fbuf to another buffer which can be queued for
later playback. However this method is not very efficient since copying
a block of memory as huge as a picture always imposes the burden of a
big system load. I was wondering if I could simply switch the buffer
pointers, say I give display_fbuf->buf[...] the pointers to the memory
region that I would normaly queue up and queue up the display_fbuf->buf
instead. However this is currently not possible due to being
display_fbuf defined as const. I removed the const for testing only, but
it seems that this is not a valid method, since my app crashes at some
point. My question now is, is there a legal method of switching buffers
or does anybody have a better solution?

Best regards
Martin