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Make the code easier to read and refactor.
Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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description
Correct a small typo in the method description.
Fixes: d6a88607479 ("libcamera: pipeline_handler: Keep track of MediaDevice")
Signed-off-by: Chris Chinchilla <chris@gregariousmammal.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
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The pipeline handler documentation incorrectly references an old API
usage of setCameraData, which should have been updated to
registerCamera() while updating pipeline handlers to ensure they all
have a pipeline-specific "CameraData" allocation.
Update the remaining documentation reference.
Fixes: b581b9576abd ("libcamera: pipeline_handler: Make pipeline-specific data mandatory")
Signed-off-by: Chris Chinchilla <chris@gregariousmammal.com>
Reviewed-by: Umang Jain <email@uajain.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
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In generateConfiguration(), add the device node specific formats to the
StreamConfiguration for each StreamRole requested.
Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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Adds FocusStatus to the image metadata, containing contrast measurements
across the image. Optionally also prints a contrast measure to the
console, to aid in manual adjustment of the lens. Note that it is not an
actual auto-focus algorithm that can drive a lens!
Signed-off-by: David Plowman <david.plowman@raspberrypi.com>
Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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Make the V4L2 compatibility layer thread-safe by serializing accesses to
the V4L2CameraProxy with a lock. Release the lock when blocking for
dqbuf.
Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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Fix buffer flags related to queueing and dequeueing:
- don't allow a buffer with the same index that is already in the queue
to be enqueued again
- don't clear the done flag upon qbuf
- do clear the done flag upon dqbuf
- set the flags in V4L2CameraProxy's internal buffers, and not just in
the buffers returned from qbuf
Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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In VIDIOC_REQBUFS with count = 0, if the buffers are still mmaped, they
should not be allowed to be freed. Add a check for this.
Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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Make VIDIOC_STREAMON return -EINVAL if no buffers have been allocated
with reqbufs.
Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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There were no bounds checks for the index argument for VIDIOC_QUERYBUF,
VIDIOC_QBUF, and VIDIOC_DQBUF. Add them.
Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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V4L2 allows buffer queueing before streamon while libcamera does not.
The compatibility layer thus saves these buffers in a pending queue
until streamon, and then automatically queues them. However, this
pending queue is not cleared when the buffers are freed, so the
following sequence of actions will cause a use-after-free:
1. queue buffers
2. free buffers
- buffers from 1. stay in pending queue but have been freed
3. queue buffers
4. streamon
- buffers from 1. are enqueued, then the buffers from 3. are
enqueued. Use-after-free segfault when libcamera tries to handle
the enqueued buffers from 1.
Fix this by clearing the pending request queue upon buffers being freed.
Also clear the pending request queue on streamOff, for correctness.
Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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In V4L2, a blocked dqbuf should not not also block a streamoff. This
means that on streamoff, the blocked dqbuf must return (with error). We
cannot do this with the libcamera semaphore, so pull out the necessary
components of a semaphore, and put them into V4L2Camera, so that dqbuf
from V4L2CameraProxy can wait on a disjunct condition of the
availability of the semaphore or the stopping of the stream.
Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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If VIDIOC_REQBUFS with count = 0 is called when the stream is not on,
clear the proxy's internal vector of buffer. If the stream is on when
reqbufs 0 is called, return -EBUSY.
Note that this is contrary to what the V4L2 docs say (reqbufs 0 when
streaming should also streamoff), but it is how the V4L2 implementation
works. v4l2-compliance doesn't seem to care either way, however, so we
cater to the implementation, and no longer call streamoff on reqbufs 0.
Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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If VIDIOC_STREMAON is called when the stream is already on, do a noop.
Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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Make VIDIOC_DQBUF return -EINVAL if the stream is not turned on.
Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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Add a method isRunning() to V4L2Camera so that V4L2CameraProxy can use
it for checks.
Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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Implement VIDIOC_ENUM_FRAMESIZES in the V4L2 compatibility layer.
Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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Implement VIDIOC_ENUMINPUT, VIDIOC_G_INPUT, and VIDIOC_S_INPUT. Only the
zeroth input device is supported, and the info returned by enuminput is
hardcoded and basic. This is sufficient to pass v4l2-compliance.
Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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Implement VIDIOC_G_PRIORITY and VIDIOC_S_PRIORITY. The behaviour
documented in the V4L2 specification doesn't match the implementation in
the Linux kernel, implement the latter.
Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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Fix the following v4l2-compliance error:
fail: v4l2-compliance.cpp(652): !(caps & V4L2_CAP_EXT_PIX_FORMAT)
Simply add V4L2_CAP_EXT_PIX_FORMAT to capabilities in querycap.
In addition, populate the necessary fields in struct v4l2_pix_format to
support extended pixel formats in try_fmt and g/s_fmt, and clear the
reserved field for enum_fmt.
Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Acked-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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The ioctl handlers currently don't check if arg is null, so if it ever
is, it will cause a segfault. Check that arg is null and return -EFAULT
in the main vidioc ioctl handler.
Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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Set buffer flag V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC at VIDIOC_REQBUFS
after the buffers have been allocated.
Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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Clear the reserved field in arg struct v4l2_reqbuffers of
VIDIOC_REQBUFS.
Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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Free buffers, if any were previously allocated, at VIDIOC_REQBUFS with
count > 0.
Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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Previously, since we acquired the libcamera camera upon open(), it was
impossible to support multiple open, as any subsequent opens would
return error because the camera would already be acquired.
To fix this, we first initialize the camera in the first call to
V4L2CameraProxy::open(), just to heat up the stream format cache. We
then add ownership by a V4L2CameraFile of a V4L2Camera via the
V4L2CameraProxy. All vidioc ioctls prior to reqbufs > 0 (except for
s_fmt) are able to access the camera without ownership. A call to
reqbufs > 0 (and s_fmt) will take ownership, and the ownership will be
released at reqbufs = 0. While ownership is assigned, the eventfd that
should be signaled (and cleared) by V4L2Camera and V4L2CameraProxy is
set to the V4L2CameraFile that has ownership, and is cleared when the
ownership is released. In case close() is called without a
reqbufs = 0 first, the ownership is also released on close().
We also use the V4L2CameraFile to contain all the information specific
to an open instance of the file. This removes the need to keep track of
such information within V4L2CameraProxy via multiple maps from int fd to
info.
Since V4L2 does not expect reqbufs 0 to ever return error, make
V4L2CameraProxy::freeBuffers() return void.
Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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Prepare for using the V4L2CameraFile as a container for file-specific
information in the V4L2 compatibility layer by making it a required
argument for all V4L2CameraProxy calls that are directed from
V4L2CompatManager, which are intercepted via LD_PRELOAD. Change
V4L2CameraFile accordingly.
Also change V4L2CompatManager accordingly. Instead of keeping a map of
file descriptors to V4L2CameraProxy instances, we keep a map of
V4L2CameraFile instances to V4L2CameraProxy instances. When the
proxy methods are called, feed the file as a parameter.
The dup function is also modified, in that it is removed from
V4L2CameraProxy, and is handled completely in V4L2CompatManager, as a
map from file descriptors to V4L2CameraFile instances.
Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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With relation to opening files, the kernel has three objects related to
files:
- inodes, that represent files on disk
- file objects, that are allocated at open() time and store all data
related to the open file
- file descriptors, that are integers that map to a file
In the V4L2 compatibility layer, V4L2CameraProxy, which wraps a single
libcamera camera via V4L2Camera, is more or less equivalent to the
inode. We also already have file descriptors (that are really eventfds)
that mirror the file descriptors. Here we create a V4L2CameraFile to
model the file objects, to contain information related to the open file,
namely if the file has been opened as non-blocking, and the V4L2
priority (to support VIDIOC_G/S_PRIORITY later on). This new class
allows us to more cleanly support multiple open later on, since we can
move out of V4L2CameraProxy the handling of mapping the fd to the open
file information.
Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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This simply wires up the libcamera sharpness control in the Raspberry
Pi IPAs so that it controls the strength of the Raspberry Pi sharpness
control algorithm.
Signed-off-by: David Plowman <david.plowman@raspberrypi.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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The sharpness control is, loosely speaking, a gain applied to
the amount of sharpening added to an image. We also report the
sharpness setting used back to the caller in metadata.
Signed-off-by: David Plowman <david.plowman@raspberrypi.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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No need for it to be std::atomic as SwitchMode runs synchronously with
Prepare.
Signed-off-by: David Plowman <david.plowman@raspberrypi.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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The control is a single float value with minimum, default and maximum
values. Please read the description for more details.
Signed-off-by: David Plowman <david.plowman@raspberrypi.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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Print format names defined in formats namespace instead of the hex
values in toString() as they are easier to comprehend. For this add
a property of 'name' in PixelFormatInfo' so as to map the formats
with their names. Print fourcc for formats which are not used in
libcamera.
Signed-off-by: Kaaira Gupta <kgupta@es.iitr.ac.in>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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When replacing DRM FourCCs with libcamera formats IPU3 format
descriptors where missing resulting in RAW capture not being possible.
Fix this by adding the missing descriptors.
Fixes: 56c99424edd64c5a ("libcamera: pipeline: Replace explicit DRM FourCCs with libcamera formats")
Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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Add an option to control compilation of the qcam test application. The
default behavior is to compile qcam, no change in behavior without user
intervention.
Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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These formats can be helpful when downstream applications or libraries
support them natively (avoiding a costly conversion).
Signed-off-by: David Plowman <david.plowman@raspberrypi.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: David Plowman <david.plowman@raspberrypi.com>
Tested-by: David Plowman <david.plowman@raspberrypi.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
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The id in the camera name is confusing and is of little use for users.
Camera names are not (yet) required to be unique and appending which
numerical CIO2 unit the sensor is attached to is just as good as
depending on the i2c bus information already present in the entity name.
Before this change,
$ cam -l
Available cameras:
1: ov13858 2-0010 0
2: ov5670 4-0036 1
After this change,
$ cam -l
Available cameras:
1: ov13858 2-0010
2: ov5670 4-0036
Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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The two public unsigned integer fields of StreamConfiguration, stride
and bufferCount where not initialized, fix this to match other members
being initialized to their 'zero' state.
Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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mode changes
This commit causes the AGC to recalculate its camera exposure/gain
values when the camera mode changes. For example it's possible
that the exposure profile could be changed by the application so
the division between exposure time and analogue gain may be
different.
The other underlying reason (and which this commit accomplishes too)
is that the sensor's line timing may change in a new mode, and because
V4L2 drivers store a number of exposure _lines_, the resulting _time_
will "change under our feet". So we have to go through the process of
recalculating the correct number of lines and writing this back to the
sensor with every mode switch, regardless of anything else.
Signed-off-by: David Plowman <david.plowman@raspberrypi.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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This commit adds a Metadata parameter to the SwitchMode method
enabling it to return camera and other settings to the caller
(usually the configure method, just after the camera mode has been
selected).
In future this will allow the Raspberry Pi IPAs to take those settings
(such as exposure and analogue gain) and program them directly into
the camera or ISP before the camera is even started.
Signed-off-by: David Plowman <david.plowman@raspberrypi.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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Some applications (eg. Firefox, Google Chrome, Skype) use open64,
openat64, and mmap64 instead of their non-64 versions that we currently
intercept. Intercept these calls as well. _LARGEFILE64_SOURCE needs to
be set so that the 64-bit symbols are available and not synonymous to
the non-64-bit versions on 64-bit systems.
Also, since we set _FILE_OFFSET_BITS to 32 to force the various open and
mmap symbols that we export to not be the 64-bit versions, our dlsym to
get the original open and mmap calls will not automatically be converted
to their 64-bit versions. Since we intercept both 32-bit and 64-bit
versions of open and mmap, we should be using the 64-bit version to
service both. Fetch the 64-bit versions of openat and mmap directly.
musl defines the 64-bit symbols as macros that are equivalent to the
non-64-bit symbols, so we put compile guards that check if the 64-bit
symbols are defined.
Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Tested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> # Compile with musl
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
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Use the new pixel format constants to replace usage of macros from
drm_fourcc.h.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
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Use the new pixel format constants to replace usage of macros from
drm_fourcc.h.
The IPU3 pipeline handler still uses DRM FourCCs for IPU3-specific
formats that are not defined in the libcamera public API.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
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Use the new pixel format constants to replace usage of macros from
drm_fourcc.h.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
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Use the new pixel format constants to replace usage of macros from
drm_fourcc.h.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
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Use the new pixel format constants to replace usage of macros from
drm_fourcc.h.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
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libcamera uses pixel format FourCC and modifier values from DRM. This
requires inclusion of drm_fourcc.h, creating a dependency on a header
that is packaged differently between distributions, and causing possible
issues with third-party applications.
Define constants for the supported pixel formats in the new formats.h
public API header, in order to remove the dependency on drm_fourcc.h.
The header is generated by a Python script from a list of supported
formats. The numerical values for the FourCC and modifier are extracted
from drm_fourcc.h by the script, ensuring that numerical values are not
inadvertently modified and preserving the direct interoperability.
The pixel formats constants can't be generated solely from drm_fourcc.h,
as that header defines FourCC values and modifier values, but doesn't
list the valid combinations. The supported formats are thus stored in a
YAML file, which contains the FourCC and optional modifier for each
supported format. We may later extend the YAML file to include formats
documentation, and possibly formats metadata to populate the
pixelFormatInfo map (in formats.cpp) automatically.
Now that two formats.h header are present (one in include/libcamera/ and
one in include/libcamera/internal/), we need to explicitly qualify the
Doxygen \file directive with a path.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
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The return value of the write to the eventfd (to signal POLLIN) from
V4L2Camera and the read from the eventfd (to clear POLLIN) from
V4L2CameraProxy was ignored. Check the return value, and print an error
message.
Reported-by: Coverity CID=290743
Reported-by: Coverity CID=290744
Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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Fix a typo in the documentation in the StreamConfiguration constructor.
Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Umang Jain <email@uajain.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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Hook up various QCam UI bits with hotplug support introduced
in previous commits. This looks good-enough as first steps
to see how the hotplugging functionality is turning out to be
from application point-of-view.
One can still think of few edge case nuances not yet covered
under this implementation especially around having only one
camera in the system and hotplugging/hot-unplugging it.
Hence, those are intentionally kept out of scope for now. It
might require some thinking on how to handle it on application
level having additional time on hand.
Signed-off-by: Umang Jain <email@uajain.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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Emit 'cameraAdded' and 'cameraRemoved' from CameraManager to enable
hotplug and hot-unplug support in application like QCam.
To avoid use-after-free race between the CameraManager and the
application, emit the 'cameraRemoved' with the shared_ptr version
of <Camera *>. This requires to change the function signature of
CameraManager::removeCamera() API.
Also, until now, CameraManager::Private::addCamera() transfers the
entire ownership of camera shared_ptr to CameraManager using
std::move(). This patch changes the signature of Private::addCamera to
accept pass-by-value camera parameter. It is done to make it clear from
the caller point of view that the pointer within the caller will still
be valid after this function returns. With this change in, we can emit
the camera pointer via 'cameraAdded' signal without hitting a segfault.
Signed-off-by: Umang Jain <email@uajain.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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