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Added changes suggested by bug #3186 : fixing the unplugging of webcam

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This commit is contained in:
StevenPuttemans 2013-08-30 13:16:18 +02:00
parent 114bec52fe
commit e7921c3fe7
1 changed files with 17 additions and 8 deletions
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25
modules/highgui/src/cap_v4l.cpp
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@ -1236,10 +1236,10 @@ static int read_frame_v4l2(CvCaptureCAM_V4L* capture) {
//set timestamp in capture struct to be timestamp of most recent frame
capture->timestamp = buf.timestamp;
return 1;
return 2;
}
static void mainloop_v4l2(CvCaptureCAM_V4L* capture) {
static int mainloop_v4l2(CvCaptureCAM_V4L* capture) {
unsigned int count;
count = 1;
@ -1273,8 +1273,13 @@ static void mainloop_v4l2(CvCaptureCAM_V4L* capture) {
break;
}
if (read_frame_v4l2 (capture))
break;
int readresult = read_frame_v412(capture);
if (readresult == 2){
return 0;
}
if (readresult){
return 1;
}
}
}
}
@ -1354,7 +1359,10 @@ static int icvGrabFrameCAM_V4L(CvCaptureCAM_V4L* capture) {
{
// skip first frame. it is often bad -- this is unnotied in traditional apps,
// but could be fatal if bad jpeg is enabled
mainloop_v4l2(capture);
if(!mainloop_v4l2(capture)){
fprintf( stderr, "HIGHGUI ERROR: V4L: Could not capture image.\n");
return 0;
}
}
#endif
@ -1366,9 +1374,10 @@ static int icvGrabFrameCAM_V4L(CvCaptureCAM_V4L* capture) {
if (V4L2_SUPPORT == 1)
{
mainloop_v4l2(capture);
if(!mainloop_v4l2(capture)){
fprintf( stderr, "HIGHGUI ERROR: V4L: Could not capture image.\n");
return 0;
}
}
#endif /* HAVE_CAMV4L2 */
#if defined(HAVE_CAMV4L) && defined(HAVE_CAMV4L2)