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fix(video): usage of invalid file descriptors on error

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Fixes code for getDeviceModes() under vfl2 namespace where error
numbers were being treated as valid file descriptors
This commit is contained in:
initramfs 2016-04-03 14:16:45 -04:00
parent dde56c99ec
commit 556a8750a1
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GPG Key ID: 78B8BDF87E9EF0AF
1 changed files with 12 additions and 10 deletions
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22
src/platform/camera/v4l2.cpp
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@ -56,28 +56,29 @@ static std::map<uint32_t,QString> createPixFmtToName()
}
const std::map<uint32_t,QString> pixFmtToName = createPixFmtToName();
static int deviceOpen(QString devName)
static int deviceOpen(QString devName, int* error)
{
struct v4l2_capability cap;
int fd;
int err;
fd = open(devName.toStdString().c_str(), O_RDWR, 0);
if (fd < 0)
return errno;
if (fd < 0) {
*error = errno;
return fd;
}
if (ioctl(fd, VIDIOC_QUERYCAP, &cap) < 0) {
err = errno;
*error = errno;
goto fail;
}
if (!(cap.capabilities & V4L2_CAP_VIDEO_CAPTURE)) {
err = ENODEV;
*error = ENODEV;
goto fail;
}
if (!(cap.capabilities & V4L2_CAP_STREAMING)) {
err = ENOSYS;
*error = ENOSYS;
goto fail;
}
@ -85,7 +86,7 @@ static int deviceOpen(QString devName)
fail:
close(fd);
return err;
return -1;
}
static QVector<unsigned short> getDeviceModeFramerates(int fd, unsigned w, unsigned h, uint32_t pixelFormat)
@ -120,8 +121,9 @@ QVector<VideoMode> v4l2::getDeviceModes(QString devName)
{
QVector<VideoMode> modes;
int fd = deviceOpen(devName);
if (fd < 0)
int error = 0;
int fd = deviceOpen(devName, &error);
if (fd < 0 || error != 0)
return modes;
v4l2_fmtdesc vfd{};
vfd.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;