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Attempt at fixing bug 3186

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This commit is contained in:
StevenPuttemans 2013-09-17 13:05:28 +02:00
parent 9cf301e257
commit 1b1fb131b3
1 changed files with 19 additions and 6 deletions
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25
modules/highgui/src/cap_v4l.cpp
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@ -248,6 +248,10 @@ make & enjoy!
#define CHANNEL_NUMBER 1
#define MAX_CAMERAS 8
// Extra global values declared for error capture
#define CAPV4L2_CAMERA_UNPLUGGED 2
#define CAPV4L2_OK 1
#define CAPV4L2_FAIL 0
// default and maximum number of V4L buffers, not including last, 'special' buffer
#define MAX_V4L_BUFFERS 10
@ -1236,10 +1240,10 @@ 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 CAPV4L2_CAMERA_UNPLUGGED;
}
static void mainloop_v4l2(CvCaptureCAM_V4L* capture) {
static int mainloop_v4l2(CvCaptureCAM_V4L* capture) {
unsigned int count;
count = 1;
@ -1273,8 +1277,11 @@ static void mainloop_v4l2(CvCaptureCAM_V4L* capture) {
break;
}
if (read_frame_v4l2 (capture))
break;
switch(int readresult = read_frame_v4l2(capture) )
case CAM_UNPLUGGED:
return CAPV4L2_FAIL;
default:
return CAPV4L2_OK;
}
}
}
@ -1354,7 +1361,10 @@ 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
@ -1367,7 +1377,10 @@ 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 */