i.MX ProcessorsのトピックRe: Hardware colorspace conversion

Hardware colorspace conversion

rebelalliance — Fri, 28 Jun 2013 17:39:40 GMT

Hi,

Using SabreSD with i.MX6Q and Linux 4.0.0 SDK.

I know that there is hardware on the IPU for hardware colorspace conversion because there is a gstreamer component for it in libmfw_gst_ipu_csc.so. I was wondering what libraries provide support for access to this hw colorspace conversion.

Do openGL and directfb that are provided with the SDK give access to hw colorspace conversion?

I am trying to improve performance of mplayer for software decoding of intra-refresh h.264 streams. Right now colorspace conversion is in software and I'd like to do this in hardware for better video playback performance.

Thanks.

Re: Hardware colorspace conversion

rebelalliance — Mon, 01 Jul 2013 22:50:44 GMT

What APIs are available to userspace that I can use to do hardware colorspace conversion (yuv to rgb, etc)?

Re: Hardware colorspace conversion

LeonardoSandova — Mon, 01 Jul 2013 23:05:24 GMT

as a first approach, Check the source code of mfw_ipucsc gstreamer element.

Re: Hardware colorspace conversion

rebelalliance — Tue, 02 Jul 2013 19:06:08 GMT

That's what I am looking at now.

Re: Hardware colorspace conversion

rebelalliance — Tue, 02 Jul 2013 23:30:52 GMT

Is libipu not available for i.MX6Q? It looks like a dummy version gets compiled for i.MX6Q platform (I am looking at imx-lib-3.0.35-4.0.0/ipu/Makefile).

What are the alternatives? Use linux/ipu.h IOCTLs?

Re: Hardware colorspace conversion

ruiguifang — Fri, 05 Jul 2013 06:45:28 GMT

The answer is here https://community.freescale.com/message/335333

Re: Hardware colorspace conversion

LeonardoSandova — Fri, 05 Jul 2013 18:43:23 GMT

FYI

https://github.com/rogeriorps/ipu-examples/blob/master/mx6/csc/example1/csc_ex1.c