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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546A">Seems subdev can implement video compose.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546A"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546A">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546A">Song Bing.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#44546A"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> gstreamer-devel [mailto:gstreamer-devel-bounces@lists.freedesktop.org]
<b>On Behalf Of </b>Bing Song<br>
<b>Sent:</b> Sunday, August 30, 2015 11:37 PM<br>
<b>To:</b> gstreamer-devel@lists.freedesktop.org<br>
<b>Subject:</b> V4L2: Is it possible implement video composite with V4L2?<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p style="background:white"><span style="font-family:"Calibri","sans-serif";color:black">Hi,<o:p></o:p></span></p>
<p style="background:white"><span style="font-family:"Calibri","sans-serif";color:black"><o:p> </o:p></span></p>
<p style="background:white"><span style="font-family:"Calibri","sans-serif";color:black">Is there any stand Kernel API to implement hardware video compositor (video mixer or text blend)? If no, is it possible implement with V4L2 API?<o:p></o:p></span></p>
<p style="background:white"><span style="font-family:"Calibri","sans-serif";color:black"><o:p> </o:p></span></p>
<p style="background:white"><span style="font-family:"Calibri","sans-serif";color:black">V4L2 API can support M2M device. M2M device for video process can be get one output ofter only get one input. So application can QUEUE several video into OUTPUT port and
one same video buffer into CAPTURE port to implement video compositor.<o:p></o:p></span></p>
<p style="background:white"><span style="font-family:"Calibri","sans-serif";color:black"><o:p> </o:p></span></p>
<p style="background:white"><span style="font-family:"Calibri","sans-serif";color:black">Unfortunately, V4L2 API can't support multi-input in OUTPUT port. Several video input have different format and resolution, application can't set several format setting
to V4L2 device. Is it possible to extend it? Or is there other stand 2D video process API? 2D video composite is really needed in Android. Also needed in GStreamer hardware accelerate video compositor. <o:p></o:p></span></p>
<p style="background:white"><span style="font-family:"Calibri","sans-serif";color:black"><o:p> </o:p></span></p>
<p style="background:white"><span style="font-family:"Calibri","sans-serif";color:black">Regards,<o:p></o:p></span></p>
<p style="background:white"><span style="font-family:"Calibri","sans-serif";color:black">Song Bing.<o:p></o:p></span></p>
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