On Thu, 2018-07-26 at 19:20 +0900, Tomasz Figa wrote: [...] > > You might want to mention that if there are insufficient buffers, then > > VIDIOC_CREATE_BUFS can be used to add more buffers. > > > > This might be a bit tricky, since at least s5p-mfc and coda can only > work on a fixed buffer set and one would need to fully reinitialize > the decoding to add one more buffer, which would effectively be the > full resolution change sequence, as below, just with REQBUFS(0), > REQBUFS(N) replaced with CREATE_BUFS. The coda driver supports CREATE_BUFS on the decoder CAPTURE queue. The firmware indeed needs a fixed frame buffer set, but these buffers are internal only and in a coda specific tiling format. The content of finished internal buffers is copied / detiled into the external CAPTURE buffers, so those can be added at will. regards Philipp
