How To Stop Video Capture - DIGITAL-LOGIC MICROSPACE PCC-P5 Technical User's Manual

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DIGITAL-LOGIC AG

PCCP5 Manual V2.3

4.11.5 How to stop video capture

//-------------------------------------------------------------------------

// FreezeVideo() : Stops capturing the incoming video; whatever is in the

// frame buffer is being displayed.

// Enter:

// none

// Exit :

// Nothing

//-------------------------------------------------------------------------

void FreezeVideo()

{

int mr03;

DWORD start_time;

WritePortUchar(ulMrAddr, MR_VIN_CTRL_2);

mr03 = ReadPortUshort(ulMrAddr); // Read current value

if((mr03 & (VIC2_START_GRAB << 8)))

{ // video is running, h/w is grabbing video, wait for input VSync

mr03 &= ~(VIC2_START_GRAB << 8); // turn off the bit to freeze the video

// Sometimes if Video Input is not comming thru video port (ZV Port

// Disabled) then we will never get Video VSync (hanging problem). We must

// time out our wait for VSync. If we do not see VSync within 2 frames

// of input VSync (80 Miliseconds for 25Hz Video, worst case) we must get

// out of the waiting loop.

start_time = timeGetTime(); // 1 millisec precision

WritePortUchar(ulMrAddr, MR_VIN_CTRL_4);

while( !(ReadPortUshort(ulMrAddr) & (VIC4_VSYNC << 8)) &&

((timeGetTime() - start_time) < 200));

WritePortUshort(ulMrAddr, mr03); // freeze the video

start_time = timeGetTime(); // 1 millisec precision

WritePortUchar(ulMrAddr, MR_VIN_CTRL_4);

while((ReadPortUshort(ulMrAddr) & (VIC4_FRM_READY << 8)) &&

((timeGetTime() - start_time) < 200));

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