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V4L: do not return frame if it can not be retrieved

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This commit is contained in:
Maksim Shabunin 2017-05-23 17:34:35 +03:00
parent 0448260ed7
commit 7cefb52fda
2 changed files with 15 additions and 2 deletions
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9
modules/videoio/src/cap_libv4l.cpp
View File

@ -312,6 +312,7 @@ typedef struct CvCaptureCAM_V4L
int deviceHandle;
int bufferIndex;
int FirstCapture;
bool returnFrame;
int width; int height;
int mode;
@ -1094,6 +1095,8 @@ static CvCaptureCAM_V4L * icvCaptureFromCAM_V4L (const char* deviceName)
capture->is_v4l2_device = 1;
}
capture->returnFrame = true;
return capture;
}; /* End icvOpenCAM_V4L */
@ -1119,6 +1122,7 @@ static int read_frame_v4l2(CvCaptureCAM_V4L* capture) {
default:
/* display the error and stop processing */
capture->returnFrame = false;
perror ("VIDIOC_DQBUF");
return -1;
}
@ -1360,7 +1364,10 @@ static IplImage* icvRetrieveFrameCAM_V4L( CvCaptureCAM_V4L* capture, int) {
}
return(&capture->frame);
if (capture->returnFrame)
return(&capture->frame);
else
return 0;
}
static int zeroPropertyQuietly(CvCaptureCAM_V4L* capture, int property_id, int value)

8
modules/videoio/src/cap_v4l.cpp
View File

@ -280,6 +280,7 @@ struct CvCaptureCAM_V4L : public CvCapture
__u32 fps;
bool convert_rgb;
bool frame_allocated;
bool returnFrame;
/* V4L2 variables */
buffer buffers[MAX_V4L_BUFFERS + 1];
@ -820,6 +821,7 @@ bool CvCaptureCAM_V4L::open(const char* _deviceName)
fps = DEFAULT_V4L_FPS;
convert_rgb = true;
deviceName = _deviceName;
returnFrame = true;
return _capture_V4L2(this) == 1;
}
@ -847,6 +849,7 @@ static int read_frame_v4l2(CvCaptureCAM_V4L* capture) {
default:
/* display the error and stop processing */
capture->returnFrame = false;
perror ("VIDIOC_DQBUF");
return -1;
}
@ -1581,7 +1584,10 @@ static IplImage* icvRetrieveFrameCAM_V4L( CvCaptureCAM_V4L* capture, int) {
break;
}
return(&capture->frame);
if (capture->returnFrame)
return(&capture->frame);
else
return 0;
}
static inline __u32 capPropertyToV4L2(int prop) {