[gst-devel] Is there any guide line for how to enable hw codec in gstreamer media framework?

[Zhao, Halley]

　　Great thanks, gstreamer mail list is more open than I expect. :).
　　
　　I think my case is the first one.
　　We are trying to create open source plugin base on libva interface.
　　http://freedesktop.org/wiki/Software/vaapi
　　
　　
　　>-----Original Message-----
　　>From: gstreamer-devel-bounces at lists.sourceforge.net
　　>[mailto:gstreamer-devel-bounces at lists.sourceforge.net] On Behalf Of
　　>Julien Moutte
　　>Sent: 2008年8月7日 17:09
　　>To: Discussion of the development of GStreamer
　　>Subject: Re: [gst-devel] Is there any guide line for how to enable hw codec
　　>in gstreamer media framework?
　　>
　　>
　　>Hi,
　　>
　　>There are multiple ways to implement hardware accelerated codecs :
　　>
　　>1) Make your own video/audio sink element that accepts encoded data
　　>buffers. For example a video sink that would take as input VC1, H.264,
　　>etc...
　　>
　　>2) Make a GStreamer element communicating with hardware and using the
　　>hardware to decode input buffers and push output buffers. For example a
　　>VC1 decoder using GPU to do the hard part but still decoding in user
　　>space memory buffers that travel into the pipeline.
　　>
　　>3) Make a set of GStreamer elements exchanging "special" buffers
　　>subclassed from GstBuffer that contain additional information about
　　>where the data is being processed in hardware pipeline so that GStreamer
　　>elements can work with it while keeping data in hardware memory space.
　　>
　　>So it depends on your hardware constraints and use case.
　　>
　　>Best regards,
　　>
　　>Julien Moutte,
　　>FLUENDO S.A.
　　>
　　>Zhao, Halley wrote:
　　>>
　　>>
　　>> Hi all:
　　>>
　　>> I don’t know how the difference is for gst element between pure software
　　>> codecs and hardware accelerated codecs,
　　>>
　　>> For example:
　　>>
　　>> The destination of sw codec always come to an audio sink or video sink,
　　>> but hw accelerated codec may directly rendering to audio device or screen.
　　>>
　　>> Do we need something special for hw codecs? How should we do for the
　　>> source pad of hw codec?
　　>>
　　>> (should we development the hw accelerated element like a sink plugin
　　>> without a source pad?)
　　>>
　　>>
　　>>
　　>> Is there any guide line for how to enable hw codec in gstreamer media
　　>> framework?
　　>>
　　>>
　　>>
　　>> Great thanks.
　　>>
　　>> BR
　　>>
　　>>
　　>>
　　>>
　　>>
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