Set the pin attribute of video capture source in the program

The video capture Source Filter automatically generated by dshow from the WDM driver has a pin property page, which must have been known and met by all experts. In this pin property page, you can set frame rate and lens resolution.

Can't I set the frame rate and the lens resolution from the program?

Of course, you can set it through a program: Use iamstreamconfig: setformat.

First, you get the ipin pointer of the pin you want to set; then QueryInterface gets the iamstreamconfig interface, through which you can set it. You can refer to the amcap example, which shows the demo using the iamstreamconfig interface.

Mr Lu spoke too well!
That's all!

Section code for your reference:

// Set the video output Pin Size and return the set value <br/> // If bmaxsize is true, the maximum supported video size is output, otherwise, the output is based on the specified size <br/> hresult ccardvideoopt: setvideosize (ibasefilter * pvideofilter <br/>, out Int & iwidth, out Int & iheight, in bool bmaxsize) <br/> {<br/> hresult hR = noerror; <br/> iamstreamconfig * pamstreamconfig = NULL; <br/> ipin * poutpin = NULL; <br/> videoinfoheader * pvihtmp; <br/> int idefaultw, idefaulth; // default video width and height </P> <p> // am_media_t Ype * pmediatype; <br/> poutpin = cgraphutility: getfirstpin (pvideofilter, pindir_output); <br/> If (poutpin = NULL) <br/>{< br/> return e_fail; <br/>}< br/> hR = poutpin-> QueryInterface (iid_iamstreamconfig, (void **) & pamstreamconfig ); <br/> If (failed (HR) <br/>{< br/> safe_release (poutpin); <br/> return hr; <br/>}</P> <p> int icount, isize; <br/> video_stream_config_caps SCC; <br/> am_media_type * PMT; </P> <p> H R = pamstreamconfig-> getnumberofcapabilities (& icount, & isize); <br/> If (sizeof (SCC )! = Isize) <br/>{< br/> safe_release (poutpin); <br/> safe_release (pamstreamconfig); <br/> return e_fail; <br/>}</P> <p> for (INT I = 0; I <icount; I ++) <br/>{< br/> hR = pamstreamconfig-> getstreamcaps (I, & PMT, (byte *) (& SCC )); <br/> pvihtmp = (videoinfoheader *) (PMT-> pbformat); </P> <p> If (PMT-> subtype = mediasubtype_rgb32) <br/> break; <br/>}< br/> idefaultw = pvihtmp-> bmiheader. biwidth; <br/> idefaulth = pvihtmp-> BM Iheader. biheight; </P> <p> If (hR = s_ OK) <br/>{< br/> // find the biggest output size. <br/> If (bmaxsize) <br/>{< br/> iwidth = SCC. maxoutputsize. CX; <br/> iheight = SCC. maxoutputsize. cy; <br/>}< br/> long cbpixel = pvihtmp-> bmiheader. bibitcount/8; // bytes per pixel in rgb32 </P> <p> // modify the format block. <br/> videoinfoheader * pvih = <br/> (videoinfoheader *) (PMT-> pbformat); <br/> pvih-> bmiheader. biw Idth = iwidth; <br/> pvih-> bmiheader. biheight = iheight; </P> <p> // set the sample size and image size. <br/> // (round the image width up to a DWORD boundary .) <br/> PMT-> lsamplesize = pvih-> bmiheader. bisizeimage = <br/> (iwidth + 3 )&~ 3) * iheight * cbpixel; </P> <p> // now set the format. <br/> hR = pamstreamconfig-> setformat (PMT); <br/> If (failed (HR) <br/>{< br/> iwidth = idefaultw; <br/> iheight = idefaulth; <br/> pvih-> bmiheader. biwidth = iwidth; <br/> pvih-> bmiheader. biheight = iheight; <br/> hR = pamstreamconfig-> setformat (PMT); <br/> If (failed (HR )) <br/>{< br/> safe_release (poutpin); <br/> safe_release (pamstreamconfig); <br/> return hr; <br/>}</P> <p> safe_release (poutpin); <br/> safe_release (pamstreamconfig); <br/> return hr; <br/>}< br/> safe_release (poutpin); <br/> safe_release (pamstreamconfig); </P> <p> return hr; <br/>}</P> <p>