[gst-devel] GPP + DSPs

[Felipe Contreras]

On Sun, Oct 5, 2008 at 7:27 PM, David Bourgoyne
<dbourgoyne at austin.rr.com> wrote:
> Felipe Contreras wrote:
>> On Fri, Sep 26, 2008 at 5:35 AM, David Bourgoyne
>> <dbourgoyne at austin.rr.com> wrote:
>>
>>> Felipe Contreras wrote:
>>>
>>>> On Wed, Sep 24, 2008 at 9:50 PM,  <dbourgoyne at austin.rr.com> wrote:
>>>>
>>>>
>>>>> Hi all,
>>>>>
>>>>> I'm considering using GStreamer for an application is which GStreamer will span a GPP and multiple DSPs.  The GPP and DSPs are connected via PCI.  So GStreamer will have to proxy buffers and messages across the PCI bus.
>>>>>
>>>>> Can you point me to documentation, info, case studies, etc. that will help me to architect this solution?
>>>>>
>>>>>
>>>> What kind of DSP/GPP?
>>>>
>>>> We can propose different ways to do it at GStreamer level, but
>>>> ultimately you would have to communicate with the hardware, is there
>>>> code that is doing that already?
>>>>
>>>>
>>>>
>>> Assume an OMAP DSP with gst-openmax.  A GPP running Linux uses v4l as a
>>> gstreamer src and needs to send buffers to the OMAP DSP to be encoded
>>> which then sends buffers back to the GPP for transmission over
>>> ethernet.  There needs to be a gstreamer proxy (marshalling) that
>>> connects the GPP GStreamer Bin to the OMAP DSP GStreamer Bin.
>>>
>>
>> Well, that's the answer isn't it?
>>
>> gst-openmax is a good example of how to communicate with an
>> asynchronous subsystem (dsp), in this case through the OpenMAX IL API.
>>
>>
> Maybe you could elaborate.  Let's take the case of the OMAP.    I have a
> main GStreamer application running on a GPP.   On the OMAP device I have
> gst-openmax running on the ARM and the actual codec running on the DSP
> abstracted by OpenMax.
>
> My question is how do I connect the GStreamer pipeline on the GPP to the
> GStreamer pipeline on the ARM seamlessly.  Control and bitstreams will
> have to be transfered over PCI, and video perphaps over PCI or Video ports.
>
> Has there been thought in the GStreamer community how to bridge this
> heterogeneous design, or is this something I have to invent.

This is a little bit confusing. ARM is a GPP, maybe by GPP you meant
an x86 machine? If that's the case then you want to connect an ARM
processor to an x86 one?

-- 
Felipe Contreras