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libcamera: v4l2_device: Implement stream{On,Off}

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Support starting and stopping a stream on a V4L2 device. Buffers must be
queued before the stream is started.

Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
This commit is contained in:
Kieran Bingham 2018-12-21 10:59:25 +00:00 • committed by Laurent Pinchart
parent dffbde33b8
commit 374673f84a
2 changed files with 48 additions and 0 deletions
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45
src/libcamera/v4l2_device.cpp
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@ -756,4 +756,49 @@ void V4L2Device::bufferAvailable(EventNotifier *notifier)
* \brief A Signal emitted when a buffer completes
*/
/**
* \brief Start the video stream
*
* \return 0 on success or a negative error code otherwise
*/
int V4L2Device::streamOn()
{
int ret;
ret = ioctl(fd_, VIDIOC_STREAMON, &bufferType_);
if (ret < 0) {
ret = -errno;
LOG(V4L2, Error)
<< "Failed to start streaming: " << strerror(-ret);
return ret;
}
return 0;
}
/**
* \brief Stop the video stream
*
* \todo Ensure completion notifications are sent for all queued buffers
*
* \return 0 on success or a negative error code otherwise
*/
int V4L2Device::streamOff()
{
int ret;
ret = ioctl(fd_, VIDIOC_STREAMOFF, &bufferType_);
if (ret < 0) {
ret = -errno;
LOG(V4L2, Error)
<< "Failed to stop streaming: " << strerror(-ret);
return ret;
}
queuedBuffersCount_ = 0;
fdEvent_->setEnabled(false);
return 0;
}
} /* namespace libcamera */