On 01/17/2013 03:55 AM, Thomas Senyk wrote: > On Thu, January 17, 2013 13:52:06 Mandeep Sandhu wrote: >> On Wed, Jan 16, 2013 at 4:22 AM, Eric Nelson >> >> <eric.nel...@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. > > They concept is to use the GPU-buffer (maybe a FBO) as a texture > (that's how it's done on the desktop and other embedded HW) > > That why you can use the video in the same matter as any other item in your > SceneGraph (e.g. transform, translate, shadereffect, mapping on 3D-items,....) > > ... so it's about features and flexibility. > > If you want a straight, simple, pixel- and color-perfect video-player... the > HW-plane sounds like the better choice. > If you want to apply shadereffects to it > (http://www.youtube.com/watch?v=SMRln8FJvKc) you have to have a video-texture. > Thanks Thomas.
I want one! I'm particularly interested in how that edge detection works (i.e. whether this is a stock OpenGL operation). _______________________________________________ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
