<div>Hi, all</div> <div> </div> <div>I am really wandering whether GStreamer supports transfering buffer with padding or stride.</div> <div>How to send information to post element that only pats of buffer is effective.</div> <div>Does caps negotiations support this function.</div> <div> </div> <div>If gstreamer can not support this feature, one aditional memcpy can not be saved, which may down 3~4fps.</div> <div> </div> <div>By the way OpenMAX support this feature.</div> <div>Here is structure, </div> <div> </div> <div> <p class="MsoNormal" style="TEXT-ALIGN: left" align="left"><font face="新宋体" color="blue" size="1"><span lang="EN-US" style="FONT-SIZE: 9pt; COLOR: blue; FONT-FAMILY: NSimSun">typedef</span></font><font face="新宋体" size="1"> <span lang="EN-US" style="FONT-SIZE: 9pt; FONT-FAMILY: NSimSun"> <font color="blue"><span style="COLOR: blue">struct</span></font> OMX_VIDEO_PORTDEFINITIONTYPE {</span></font></p> <p class="MsoNormal" style="TEXT-ALIGN: left" align="left"><font face="新宋体" size="1"><span lang="EN-US" style="FONT-SIZE: 9pt; FONT-FAMILY: NSimSun">    OMX_STRING cMIMEType;</span></font></p> <p class="MsoNormal" style="TEXT-ALIGN: left" align="left"><font face="新宋体" size="1"><span lang="EN-US" style="FONT-SIZE: 9pt; FONT-FAMILY: NSimSun">    OMX_NATIVE_DEVICETYPE pNativeRender;</span></font></p> <p class="MsoNormal" style="TEXT-ALIGN: left" align="left"><b><font face="新宋体" size="1"><span lang="EN-US" style="FONT-WEIGHT: bold; FONT-SIZE: 9pt; FONT-FAMILY: NSimSun">    OMX_U32 nFrameWidth;</span></font></b></p> <p class="MsoNormal" style="TEXT-ALIGN: left" align="left"><font face="新宋体" size="1"><span lang="EN-US" style="FONT-SIZE: 9pt; FONT-FAMILY: NSimSun">    OMX_U32 nFrameHeight;</span></font></p> <p class="MsoNormal" style="TEXT-ALIGN: left" align="left"><b><font face="新宋体" size="1"><span lang="EN-US" style="FONT-WEIGHT: bold; FONT-SIZE: 9pt; FONT-FAMILY: NSimSun">    OMX_S32 nStride;</span></font></b></p> <p class="MsoNormal" style="TEXT-ALIGN: left" align="left"><font face="新宋体" size="1"><span lang="EN-US" style="FONT-SIZE: 9pt; FONT-FAMILY: NSimSun">    OMX_U32 nSliceHeight;</span></font></p> <p class="MsoNormal" style="TEXT-ALIGN: left" align="left"><font face="新宋体" size="1"><span lang="EN-US" style="FONT-SIZE: 9pt; FONT-FAMILY: NSimSun">    OMX_U32 nBitrate;</span></font></p> <p class="MsoNormal" style="TEXT-ALIGN: left" align="left"><font face="新宋体" size="1"><span lang="EN-US" style="FONT-SIZE: 9pt; FONT-FAMILY: NSimSun">    OMX_U32 xFramerate;</span></font></p> <p class="MsoNormal" style="TEXT-ALIGN: left" align="left"><font face="新宋体" size="1"><span lang="EN-US" style="FONT-SIZE: 9pt; FONT-FAMILY: NSimSun">    OMX_BOOL bFlagErrorConcealment;</span></font></p> <p class="MsoNormal" style="TEXT-ALIGN: left" align="left"><font face="新宋体" size="1"><span lang="EN-US" style="FONT-SIZE: 9pt; FONT-FAMILY: NSimSun">    OMX_VIDEO_CODINGTYPE eCompressionFormat;</span></font></p> <p class="MsoNormal" style="TEXT-ALIGN: left" align="left"><font face="新宋体" size="1"><span lang="EN-US" style="FONT-SIZE: 9pt; FONT-FAMILY: NSimSun">    OMX_COLOR_FORMATTYPE eColorFormat;</span></font></p> <p class="MsoNormal" style="TEXT-ALIGN: left" align="left"><font face="新宋体" size="1"><span lang="EN-US" style="FONT-SIZE: 9pt; FONT-FAMILY: NSimSun">    OMX_NATIVE_WINDOWTYPE pNativeWindow;</span></font></p> <p class="MsoNormal" style="TEXT-ALIGN: left" align="left"><font face="新宋体" size="1"><span lang="EN-US" style="FONT-SIZE: 9pt; FONT-FAMILY: NSimSun">} OMX_VIDEO_PORTDEFINITIONTYPE;</span></font></p> <p class="MsoNormal"><font face="Arial" color="navy" size="1"><span lang="EN-US" style="FONT-SIZE: 9pt; COLOR: navy; FONT-FAMILY: Arial"> </span></font></p> <p class="MsoNormal" style="TEXT-ALIGN: left" align="left"><font face="新宋体" color="green" size="1"><span lang="EN-US" style="FONT-SIZE: 9pt; COLOR: green; FONT-FAMILY: NSimSun">*  nFrameWidth           : Width of frame to be used on channel if </span></font></p> <p class="MsoNormal" style="TEXT-ALIGN: left" align="left"><font face="新宋体" color="green" size="1"><span lang="EN-US" style="FONT-SIZE: 9pt; COLOR: green; FONT-FAMILY: NSimSun"> *                          uncompressed format is used.  Use 0 for unknown, </span></font></p> <p class="MsoNormal" style="TEXT-ALIGN: left" align="left"><font face="新宋体" color="green" size="1"><span lang="EN-US" style="FONT-SIZE: 9pt; COLOR: green; FONT-FAMILY: NSimSun"> *                          don't care or variable </span></font></p> <p class="MsoNormal" style="TEXT-ALIGN: left" align="left"><font face="新宋体" color="green" size="1"><span lang="EN-US" style="FONT-SIZE: 9pt; COLOR: green; FONT-FAMILY: NSimSun"> *  nFrameHeight          : Height of frame to be used on channel if </span></font></p> <p class="MsoNormal" style="TEXT-ALIGN: left" align="left"><font face="新宋体" color="green" size="1"><span lang="EN-US" style="FONT-SIZE: 9pt; COLOR: green; FONT-FAMILY: NSimSun"> *                          uncompressed format is used. Use 0 for unknown, </span></font></p> <p class="MsoNormal" style="TEXT-ALIGN: left" align="left"><font face="新宋体" color="green" size="1"><span lang="EN-US" style="FONT-SIZE: 9pt; COLOR: green; FONT-FAMILY: NSimSun"> *                          don't care or variable </span></font></p> <p class="MsoNormal" style="TEXT-ALIGN: left" align="left"><font face="新宋体" color="green" size="1"><span lang="EN-US" style="FONT-SIZE: 9pt; COLOR: green; FONT-FAMILY: NSimSun"> *  nStride               : Number of bytes per span of an image </span></font></p> <p class="MsoNormal" style="TEXT-ALIGN: left" align="left"><font face="新宋体" color="green" size="1"><span lang="EN-US" style="FONT-SIZE: 9pt; COLOR: green; FONT-FAMILY: NSimSun"> *                          (i.e. indicates the number of bytes to get </span></font></p> <p class="MsoNormal" style="TEXT-ALIGN: left" align="left"><font face="新宋体" color="green" size="1"><span lang="EN-US" style="FONT-SIZE: 9pt; COLOR: green; FONT-FAMILY: NSimSun"> *                          from span N to span N+1, where negative stride </span></font></p> <p class="MsoNormal" style="TEXT-ALIGN: left" align="left"><font face="新宋体" color="green" size="1"><span lang="EN-US" style="FONT-SIZE: 9pt; COLOR: green; FONT-FAMILY: NSimSun"> *                          indicates the image is bottom up </span></font></p><br>Thanks</div> <div> </div> <div><br> </div> <div><span class="gmail_quote">On 7/3/07, <b class="gmail_sendername">zhangfei gao</b> <<a href="mailto:zhangfei.gao@gmail.com">zhangfei.gao@gmail.com</a>> wrote:</span> <blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid"> <p>Hi,  all</p> <div>Does gstreamer support sub-square transfering.</div> <div><br>For example the original data is a square(0, 0, 100, 100), with start point (0, 0), width is 100, height is 100. </div> <div>Now I just transfer (0, 0, 50, 50), only the left half square from one plugin to the later plugin.</div> <div>Is there any method or how to negotiate. </div> <div>Does standard caps has any field to describe such information.</div> <div><br>The reason is my codec is from third party, with a limitation its output has padding inside. <br>If standard buffer transering is without padding, memcpy is unavoidable.</div> <div><br>Still, I think transfering sub-square is needed in many situations.<br>For example, if user want to zoom interest area, there must be some method other than memcpy.</div> <div> </div> <div>Could you share some ideas.</div> <div><br>Thanks in advance</div></blockquote></div><br>