<div>Hi, Time</div> <div> </div> <div>Thank you for your valuable inforamtion.</div> <div>As your suggestion, we want to support 2d_sub_buffer<span lang="EN-US" style="FONT-SIZE: 10.5pt"> , it will be more meanful if the idea could be accepted by opensource experts, so could you help review the idea and feasibility in advance. </span></div> <div><span lang="EN-US" style="FONT-SIZE: 10.5pt"></span> </div> <div><span lang="EN-US" style="FONT-SIZE: 10.5pt">See this figure, we just want to render display 2d_sub_buffer (x, y, w, h), which is located inside transferd buffer.</span></div> <div><span lang="EN-US" style="FONT-SIZE: 10.5pt"></span> </div> <div><span lang="EN-US" style="FONT-SIZE: 10.5pt">Note: 2d_sub_buffer is based on the original buffer, they are sharing memory and without memcpy. Here sub buffer just used to notify the sub area, no new buffer is created. </span></div> <div><span lang="EN-US" style="FONT-SIZE: 10.5pt"></span> </div> <div><span lang="EN-US" style="FONT-SIZE: 10.5pt">Problem is how to negotiate with render where is the effective area.</span></div> <div><font face="Arial" size="1"><span lang="EN-US" style="FONT-SIZE: 9pt; FONT-FAMILY: Arial"><img height="124" src="cid:image001.jpg@01C7C474.1EF34BA0" width="214"></span></font></div> <div><br>New caps area is "<span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-fareast-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"> 2d_sud_buffer</span>", if render do not detect such area, it will do as usual to ensure compatibility, and render display the whole area.</div> <div> </div> <div><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-fareast-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"> 2d_sud_buffer </span>structure is as following, same as GstVideoRectangle.</div> <div> </div> <div> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US"><font face="Times New Roman">typedef struct _2d_sud_buffer 2d_sud_buffer;</font></span></p></div> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US"><font face="Times New Roman">/**</font></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US"><font face="Times New Roman"><span style="mso-spacerun: yes"> </span>* 2d_sud_buffer:</font></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US"><font face="Times New Roman"><span style="mso-spacerun: yes"> </span>* @x: X coordinate of 2d-sud-buffer's top-left point</font></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US"><font face="Times New Roman"><span style="mso-spacerun: yes"> </span>* @y: Y coordinate of 2d-sud-buffer 's top-left point</font></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US"><font face="Times New Roman"><span style="mso-spacerun: yes"> </span>* @w: width of the 2d-sud-buffer</font></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US"><font face="Times New Roman"><span style="mso-spacerun: yes"> </span>* @h: height of the 2d-sud-buffer</font></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US"><font face="Times New Roman"><span style="mso-spacerun: yes"> </span>*</font></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US"><font face="Times New Roman">*/</font></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US"><font face="Times New Roman">struct _2d_sud_buffer {</font></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US"><font face="Times New Roman"><span style="mso-spacerun: yes">  </span>gint x;</font></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US"><font face="Times New Roman"><span style="mso-spacerun: yes">  </span>gint y;</font></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US"><font face="Times New Roman"><span style="mso-spacerun: yes">  </span>gint w;</font></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US"><font face="Times New Roman"><span style="mso-spacerun: yes">  </span>gint h;</font></span></p> <div class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US"><font face="Times New Roman">};</font></span></div> <div class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US"><font face="Times New Roman"></font></span> </div> <div>Option 1:</div> <div>Just send address of the 2d_sub_buffer by G_TYPE_INT.</div> <div>In render set_capas function, we re-construct this structure by <span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-fareast-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"> (2d_sub_buffer *) priv.</span></div> <div><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-fareast-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"> </span> </div> <div><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-fareast-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"> Option 2:</span></div> <div><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-fareast-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"> Add one field in caps, such as G_TYPE_2D_SUB_BUFFER.</span></div> <div><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-fareast-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"> transmitter caps:</span></div> <div><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-fareast-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"> gst_caps_new_simple ("video/x-raw-yuv", <br>  "format", GST_TYPE_FOURCC, GST_MAKE_FOURCC ('Y', 'V', '1', '2'), <br>  "width", G_TYPE_INT, frameWidth, <br>  "height", G_TYPE_INT, frameHeight,       <br>  "framerate", GST_TYPE_FRACTION, num, den,<br> <strong> "2d_sub_buffer", <font face="Times New Roman">G_TYPE_2D_SUB_BUFFER, </font>x, y, w, h,<br></strong>  NULL);</span></div> <div><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-fareast-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"> </span> </div> <div><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-fareast-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"> reciver set_caps:</span></div> <div><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-fareast-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"> if ((value = gst_structure_get_value (str, "2d_sub_buffer"))) {<br>   rect.x = gst_value_get_2d_sub_buffer_x(value);<br>   rect.y = gst_value_get_2d_sub_buffer_y(value);<br>   rect.w = gst_value_get_2d_sub_buffer_w(value); <br>   rect.h = gst_value_get_2d_sub_buffer_h(value);<br>  }</span></div> <div><br> If use option 2, Gstvalue.c and Gststructure.c need add a patch.</div> <div><span class="type"></span> </div> <div><span class="type">Could you give some suggestions.</span></div> <div><span class="type">Waiting for your instructions.</span></div> <div><span class="type"></span> </div> <div><span class="type">Thanks.</span></div> <div><span class="type"></span> </div> <div><span class="type"></span> </div> <div> </div> <div> </div> <div><span class="gmail_quote">On 7/5/07, <b class="gmail_sendername">Tim Müller</b> <<a onclick="return top.js.OpenExtLink(window,event,this)" href="mailto:t.i.m@zen.co.uk" target="_blank">t.i.m@zen.co.uk</a>> wrote: </span> <blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">On Thu, 2007-07-05 at 21:11 +0800, zhangfei gao wrote:<br><br>> I am really wandering whether GStreamer supports transfering buffer <br>> with padding or stride.<br>> How to send information to post element that only pats of buffer is<br>> effective.<br>> Does caps negotiations support this function.<br>><br>> If gstreamer can not support this feature, one aditional memcpy can <br>> not be saved, which may down 3~4fps.<br><br>Unfortunately, GStreamer does not support this yet.  Strides and row<br>padding for the various formats in GStreamer are mostly implicit at the<br>moment.  Border padding/cropping isn't defined/used at all.  It's <br>something we want to fix though, it's just that no one has gotten around<br>to actually doing it yet.<br><br>You are of course free to create your own video/x-raw-my-yuv format<br>which has additional parameters like that, but obviously that would only <br>work for GStreamer pipelines (or parts thereof) that consist only of<br>elements you have written and not any of the stock GStreamer elements.<br><br>Cheers<br>-Tim<br><br><br><br>------------------------------------------------------------------------- <br>This SF.net email is sponsored by DB2 Express<br>Download DB2 Express C - the FREE version of DB2 express and take<br>control of your XML. 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