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Merge pull request #12262 from sivaraam:v4l2_mainloop

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This commit is contained in:
Alexander Alekhin 2018-08-21 12:47:29 +00:00
commit 1deeca985f
1 changed files with 27 additions and 33 deletions
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60
modules/videoio/src/cap_v4l.cpp
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@ -857,45 +857,39 @@ static int read_frame_v4l2(CvCaptureCAM_V4L* capture) {
} }
static int mainloop_v4l2(CvCaptureCAM_V4L* capture) { static int mainloop_v4l2(CvCaptureCAM_V4L* capture) {
unsigned int count; for (;;) {
fd_set fds;
struct timeval tv;
int r;
count = 1; FD_ZERO (&fds);
FD_SET (capture->deviceHandle, &fds);
while (count-- > 0) { /* Timeout. */
for (;;) { tv.tv_sec = 10;
fd_set fds; tv.tv_usec = 0;
struct timeval tv;
int r;
FD_ZERO (&fds); r = select (capture->deviceHandle+1, &fds, NULL, NULL, &tv);
FD_SET (capture->deviceHandle, &fds);
/* Timeout. */ if (-1 == r) {
tv.tv_sec = 10; if (EINTR == errno)
tv.tv_usec = 0; continue;
r = select (capture->deviceHandle+1, &fds, NULL, NULL, &tv); perror ("select");
if (-1 == r) {
if (EINTR == errno)
continue;
perror ("select");
}
if (0 == r) {
fprintf (stderr, "select timeout\n");
/* end the infinite loop */
break;
}
int returnCode = read_frame_v4l2 (capture);
if(returnCode == -1)
return -1;
if(returnCode == 1)
return 1;
} }
if (0 == r) {
fprintf (stderr, "select timeout\n");
/* end the infinite loop */
break;
}
int returnCode = read_frame_v4l2 (capture);
if(returnCode == -1)
return -1;
if(returnCode == 1)
return 1;
} }
return 0; return 0;
} }