[Interest] I.MX6 and QT5

[Mandeep Sandhu]

On Wed, Jan 16, 2013 at 4:22 AM, Eric Nelson
<eric.nelson at boundarydevices.com> wrote:
> On 01/15/2013 03:43 PM, qtnext wrote:
>> thanks for the info ... I hopes that with I.MX6 it's possible to decode
>> HD video in hardware and for example remap to an opengl texture or
>> quick2 item , but I have checked on freescale website and I am not sure
>> if accelerated decoding is not only for overlay display...
>>
>  > <snip>
>
> Possible? yes.
>
> Easy? Maybe for someone with a very precise set of knowledge...
>
> The VPU decoder natively supports YUV output, which, as you mention
> can be directly fed to a hardware overlay layer.
>
> The Vivante GPU also supports a variety of YUV planes though, so
> there's a possibility that a memory buffer known to the GPU can
> be used as the 'sink' for a gstreamer element and the GPU could
> work with or convert it as necessary.

We're also using a media SoC with Vivante GPU and Qt 4.8 (on
DirectFB). We have a media player application (2D gfx only) that uses
GStreamer with Fluendo gst elements for audio/video decoder and sinks.
Both media decoding and 2D gfx are h/w accelerated. The SoC offers 4
h/w planes with

We merge the o/p of Qt and Gstreamer on the various h/w planes made
available by the SoC (there are 4 of them). The z-order is such that
the OSD plane (used by Qt) comes on top of video plane. The video is
visible by making the required area on the OSD plane transparent.

I don't have much exp with openGL, but wouldn't that work for merging
opengl surface with the decoded video o/p as well? Why would you want
to give the GPU buffer to the Gstreamer sink?

Though I understand that any effects applied on the OSD layer (i.e in
Qt) would not work on the video as that would be a different plane.

-mandeep


>
> Just how that magic would happen, and what else is needed to
> expose the buffer(s) to Quick2 is left as a rather large exercise
> for the reader(s).
>
> Regards,
>
>
> Eric
> _______________________________________________
> Interest mailing list
> Interest at qt-project.org
> http://lists.qt-project.org/mailman/listinfo/interest