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-rw-r--r--src/libcamera/v4l2_videodevice.cpp12
1 files changed, 11 insertions, 1 deletions
diff --git a/src/libcamera/v4l2_videodevice.cpp b/src/libcamera/v4l2_videodevice.cpp
index baf683d6..a9509bff 100644
--- a/src/libcamera/v4l2_videodevice.cpp
+++ b/src/libcamera/v4l2_videodevice.cpp
@@ -481,7 +481,8 @@ const std::string V4L2DeviceFormat::toString() const
* \param[in] deviceNode The file-system path to the video device node
*/
V4L2VideoDevice::V4L2VideoDevice(const std::string &deviceNode)
- : V4L2Device(deviceNode), cache_(nullptr), fdBufferNotifier_(nullptr)
+ : V4L2Device(deviceNode), cache_(nullptr), fdBufferNotifier_(nullptr),
+ streaming_(false)
{
/*
* We default to an MMAP based CAPTURE video device, however this will
@@ -1554,6 +1555,8 @@ int V4L2VideoDevice::streamOn()
return ret;
}
+ streaming_ = true;
+
return 0;
}
@@ -1565,12 +1568,18 @@ int V4L2VideoDevice::streamOn()
* and the bufferReady signal is emitted for them. The order in which those
* buffers are dequeued is not specified.
*
+ * This will be a no-op if the stream is not started in the first place and
+ * has no queued buffers.
+ *
* \return 0 on success or a negative error code otherwise
*/
int V4L2VideoDevice::streamOff()
{
int ret;
+ if (!streaming_ && queuedBuffers_.empty())
+ return 0;
+
ret = ioctl(VIDIOC_STREAMOFF, &bufferType_);
if (ret < 0) {
LOG(V4L2, Error)
@@ -1588,6 +1597,7 @@ int V4L2VideoDevice::streamOff()
queuedBuffers_.clear();
fdBufferNotifier_->setEnabled(false);
+ streaming_ = false;
return 0;
}