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2020-03-07gst: utils: Factor-out the task resume helperJakub Adam
Task resume will be added in the core GStreamer API in the future and we will need to call this in another location in the following patches. Signed-off-by: Jakub Adam <jakub.adam@collabora.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2020-03-07gst: libcamerasrc: Add a TODO commentNicolas Dufresne
This is to guide upcoming contributors toward what is left to do to get toward a production ready element. Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2020-03-07gst: libcamerasrc: Implement timestamp supportNicolas Dufresne
This is an experimental patch adding timestamp support to the libcamerasrc element. This patch currently assume that the driver timestamp are relative to the system monotonic clock. Without a reference clock source, the timestamp are otherwise unusable, and without timestamp only minor use case can be achieved. Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2020-03-07gst: libcamerasrc: Implement initial streamingNicolas Dufresne
With this patch, the element is now able to push buffers to the next element in the graph. The buffers are currently missing any metadata like timestamp, sequence number. This will be added in the next commit. Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2020-03-07gst: pad: Add method to store retrieve pending buffersNicolas Dufresne
These will be useful for streaming. The requestComplete callback will store the buffers on each pads so that the _run() can pick them up and push them through the pads from a streaming thread. Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2020-03-07gst: Add getters for Stream and FrameBufferNicolas Dufresne
This adds getters on pad/pool/allocator so that we can retrieve the Stream or FrameBuffer. Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2020-03-07gst: libcamerasrc: Allocate and release buffersNicolas Dufresne
Setup the allocation and the release of buffers in the element. We have one pooling GstAllocator that wraps the FrameBufferAllocator and tracks the lifetime of FrameBuffer objects. Then, for each pad we have a GstBufferPool object which is only used to avoid re-allocating the GstBuffer structure every time we push a buffer. Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2020-03-07gst: libcamerapad: Allow storing a poolNicolas Dufresne
This adds get/set helper to store a pool on the pad. Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2020-03-07gst: Add a pool and an allocator implementationNicolas Dufresne
This is needed to track the lifetime of the FrameBufferAllocator in relation to the GstBuffer/GstMemory objects travelling inside GStreamer. Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2020-03-07gst: libcamerasrc: Push segment eventNicolas Dufresne
Now that we have stream-start and caps, we can now push a segment event to announce what time will our buffer correlate to. For live sources this is just an open segment in time format. Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2020-03-07gst: libcamerasrc: Implement minimal caps negotiationNicolas Dufresne
This is not expected to work in every possible cases, but should be sufficient as an initial implementation. What it does is that it turns the StreamFormats into caps and queries downstream caps with that as a filter. The result is the subset of caps that can be used. We then keep the first structure in that result and fixate using the default values found in StreamConfiguration as a default in case a range is available. We then validate this configuration and turn the potentially modified configuration into caps that we push downstream. Note that we trust the order in StreamFormats as being sorted best first, but this is not currently in libcamera. A todo has been added in the head of this file as a reminder to fix that in the core. Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2020-03-07gst: utils: Add StreamConfiguration helpersNicolas Dufresne
This adds helpers to deal with the conversion from StreamConfiguration to caps and vice-versa. This is needed to implement caps negotiation. Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2020-03-07gst: libcamerasrc: Send stream start eventNicolas Dufresne
Prior to sending caps, we need to send a stream-start event. This requires generating a stream and a group id. The stream id is random for live sources and the group id is shared across all pads. Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2020-03-07gst: libcamerasrc: Store the srcpad in a vectorNicolas Dufresne
This will allow implementing generic algorithm even if we cannot request pads yet. Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2020-03-07gst: libcamerapad: Add a method to access the roleNicolas Dufresne
Each pad can have a different roles. Users will have to request and configure their pads role before moving to a higher state. Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2020-03-07gst: libcamerasrc: Add a task for the streaming threadNicolas Dufresne
Use a GstTask as our internal streaming thread. Unlike GstBaseSrc, we will be running a streaming thread at the element level rather than per pad. This is needed to combine buffer request for multiple pads. Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2020-03-07gst: libcamerasrc: Implement selection and acquisitionNicolas Dufresne
This adds code to select and acquire a camera. With this, it is now possible to run a pipeline like: gst-launch-1.0 libcamerasrc ! fakesink Though no buffer will be streamed yet. In this function, we implement the change_state() virtual method to trigger actions on specific state transitions. Note that we also return GST_STATE_CHANGE_NO_PREROLL in GST_STATE_CHANGE_READY_TO_PAUSED and GST_STATE_CHANGE_PLAYING_TO_PAUSED transitions as this is required for all live sources. Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2020-03-07gst: libcamerasrc: Add a debug categoryNicolas Dufresne
This will allow selecting libcamerasrc traces with the following environment: GST_DEBUG=libcamerasrc:7 Or all libcamera GStreamer element traces using GST_DEBUG="libcamera*:7" Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2020-03-07gst: libcamerasrc: Add camera-name propertyNicolas Dufresne
This property will be used to select by name the camera to use. Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2020-03-07gst: libcamerasrc: Allocate and add static padNicolas Dufresne
This pad will always be present and will allow simple pipeline to be used to stream from the camera. Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2020-03-07gst: Add pads to the sourceNicolas Dufresne
This simply adds the boiler plate for pads on the source element. The design is that we have one pad, called "src", that will always be present, and then more pads can be requested prior in READY or less state. Initially pads have one property "stream-role" that let you decide which role this pad will have. Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2020-03-07gst: utils: Add simple scoped lockers for GMutex and GRectMutexNicolas Dufresne
While GLib has locker implementation already using g_autoptr(), recursive mutex locker was only introduced in recent GLib. Implement a simple locker for GMutex and GRectMutex in order to allow making locking simpler and safer. Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2020-03-07gst: Add initial device providerNicolas Dufresne
This feature is used with GstDeviceMonitor in order to enumerate and monitor devices to be used with the source element. The resulting GstDevice implementation is also used by application to abstract the configuration of the source element. Implementation notes: - libcamera does not support polling yet - The device ID isn't unique in libcamera yet - The "name" property does not yet exist in libcamerasrc yet Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2020-03-07gst: Add utility to convert StreamFormats to GstCapsNicolas Dufresne
This transforms the basic information found in StreamFormats to GstCaps. This can be handy to reply to early caps query or inside a device provider. Note that we ignored generated range as they are harmful to caps negotiation. We also don't simplify the caps for readability reasons, so some of the discrete value may be included in a range. Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2020-03-07Add GStreamer plugin and element skeletonNicolas Dufresne
This implements the GStreamer plugin interface and adds libcamerasrc element feature to it. This is just enough to allow plugin introspection. gst-inspect-1.0 build/src/gstreamer/libgstlibcamera.so Plugin Details: Name libcamera Description libcamera capture plugin Filename build/src/gstreamer/libgstlibcamera.so Version 0.0.0+1042-6c9f16d3-dirty License LGPL Source module libcamera Binary package libcamera Origin URL https://libcamera.org libcamerasrc: libcamera Source 1 features: GST_PLUGIN_PATH=$(pwd)/build/src/gstreamer gst-inspect-1.0 libcamerasrc Factory Details: Rank primary (256) Long-name libcamera Source Klass Source/Video Description Linux Camera source using libcamera Author Nicolas Dufresne <nicolas.dufresne@collabora.com Plugin Details: Name libcamera Description libcamera capture plugin Filename /home/nicolas/Sources/libcamera/build/src/gstreamer/libgstlibcamera.so Version 0.0.0+1042-6c9f16d3-dirty License LGPL Source module libcamera Binary package libcamera Origin URL https://libcamera.org GObject +----GInitiallyUnowned +----GstObject +----GstElement +----GstLibcameraSrc Pad Templates: none Element has no clocking capabilities. Element has no URI handling capabilities. Pads: none Element Properties: name : The name of the object flags: accès en lecture, accès en écriture, 0x2000 String. Default: "libcamerasrc0" parent : The parent of the object flags: accès en lecture, accès en écriture, 0x2000 Object of type "GstObject" Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> [Silence -Wunused-function warning for older GLib versions] Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2020-03-07libcamera: v4l2_videodevice: Don't use std::atomic specializationLaurent Pinchart
The std::atomic_uint64_t specialization was missing from C++14, and only added to C++17 (see LWG 2441). It was treated as a Defect Report and backported to earlier C++ standards by gcc and clang, but is missing from libstdc++ shipped with gcc 5 and gcc 6. Fix the compilation error by using std::atomic<uint64_t> instead. Fixes: 4e0d1eca10b7 ("libcamera: V4L2BufferCache: Improve cache eviction strategy") Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
2020-03-06libcamera: V4L2BufferCache: Improve cache eviction strategyNiklas Söderlund
The strategy used to find a free cache entry in the first implementation was not the smartest, it picked the first free entry. This lead to unwanted performance issues as the cache was not used as good as it could for imported buffers. Improve this by adding a last usage sequence number to the cache entries and change the eviction strategy to use the oldest free entry instead of the first one it finds. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Naushir Patuck <naush@raspberrypi.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2020-03-06libcamera: V4L2BufferCache: Check for hot hit firstNiklas Söderlund
Check for a hot cache hit before updating which buffer is best to evict in case no hot hit is found. This doesn't change the behaviour, but follows a more logical flow. Suggested-by: Jacopo Mondi <jacopo@jmondi.org> Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2020-03-06libcamera: V4L2BufferCache: Use the entry referenceNiklas Söderlund
Instead of looking up the index in the storage vector use the reference to it created at the beginning of the loop. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2020-03-06libcamera: V4L2BufferCache: Mark Entry::operator==() as constNiklas Söderlund
The comparison operator does not change any state, mark it as const. Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2020-03-06cam: Add option to list camera propertiesJacopo Mondi
Add the '-p'|'--list-properties' option to the cam application to list the properties of a camera. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2020-03-06libcamera: control_serializer: Add support for array controlsJacopo Mondi
Add support for serializing and deserializing control values that store arrays of values. The serialized format is extended to explicitly handle arrays. Signed-off-by: Jacopo Mondi <jacopo@jmondi.org> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2020-03-06libcamera: control_serializer: Use zero-copy ByteStreamBuffer::read()Laurent Pinchart
Use the zero-copy variant of ByteStreamBuffer::read() to read packet headers and control entries. This enhances the performance of ControlList and ControlInfoMap deserialization. Deserialization of the actual ControlValue is untouched for now and will be optimized later. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.binghm@ideasonboard.com>
2020-03-06libcamera: control_serializer: Simplify serialization of ControlValueLaurent Pinchart
Use the ControlValue::data() function to access raw data stored in the control value and simplify serialization. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.binghm@ideasonboard.com>
2020-03-06libcamera: control_serializer: Use explicit ControlTypeNone caseLaurent Pinchart
Replace the default case with an explicit ControlTypeNone case in ControlSerializer::load() to catch omissions when adding new control types. A return statement needs to be added to the end of the function to avoid gcc incorrectly reporting that some exit paths don't contain a return statement. The compiler will still warn that not all cases are handled when adding a new control type. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2020-03-06libcamera: byte_stream_buffer: Add zero-copy read() variantLaurent Pinchart
Add a read() function to ByteStreamBuffer that returns a pointer to the data instead of copying it. Overflow check is still handled by the class, but the caller must check the returned pointer explicitly. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2020-03-06libcamera: byte_stream_buffer: Add Span<> supportJacopo Mondi
Add support to write and read a Span<> to and from the ByteStreamBuffer class. Signed-off-by: Jacopo Mondi <jacopo@jmondi.org> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2020-03-06libcamera: byte_stream_buffer: Fix documentation of read() and write()Jacopo Mondi
The documentation of the read() and write() functions refer to non existent 'size' and 'data' parameters in their brief. Fix them. Signed-off-by: Jacopo Mondi <jacopo@jmondi.org> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2020-03-06libcamera: ipa: Support array controls in ipa_control_value_entryLaurent Pinchart
Report in a new field of the ipa_control_value_entry structure if the value contains an array. Reorganize the other fields of the structure to avoid increasing its size. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2020-03-06libcamera: controls: Convert bool ControlValue to lowercase stringsLaurent Pinchart
The C++ boolean types are lower case, and std::ostream::operator<<(bool) produces a lowercase string (when std::boolalpha is in effect, otherwise it produces 0 or 1). Switch ControlValue::toString() to produce lowercase "true" and "false" strings too for consistency. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2020-03-06libcamera: controls: Add support for byte controlsJacopo Mondi
Add support for byte values to the control framework and to the control serializer. Signed-off-by: Jacopo Mondi <jacopo@jmondi.org> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2020-03-06libcamera: controls: Add support for float controlsJacopo Mondi
Add support for float values in Control<> and ControlValue classes. Signed-off-by: Jacopo Mondi <jacopo@jmondi.org> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2020-03-06libcamera: controls: Add a 'size' yaml propertyJacopo Mondi
Add a 'size' property to the control yaml description, to convey the size constraints of array controls. The semantics of the property contents is currently unspecified, but its presence triggers the generation of an array control (Control<Span<const T>>). Example: - BayerGains: type: float description: Gains to apply to the four Bayer colour components for white balance size: [4] Signed-off-by: Jacopo Mondi <jacopo@jmondi.org> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2020-03-06libcamera: controls: Allow passing an std::initializer list to set()Laurent Pinchart
For array controls, the ControlList::set() function takes a value as a type convertible to Span<T>. This allows passing an std::array or an std::vector in addition to an explicit Span, but doesn't accept an std::initializer list as Span has no constructor that takes an initializer list. Callers are thus forced to create temporary objects explicitly, which isn't nice. Fix the issue by providing a ControlList::set() function that takes an std::initializer_list, and convert it to a Span internally. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2020-03-06libcamera: controls: Support array controls in ControlValueJacopo Mondi
Add array controls support to the ControlValue class. The polymorphic class can now store more than a single element and supports access and creation through the use of Span<>. Signed-off-by: Jacopo Mondi <jacopo@jmondi.org> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2020-03-06libcamera: controls: Expose raw data in ControlValueLaurent Pinchart
Add a data() function to the ControlValue class to expose the raw data stored by the class as a Span<const uint8_t>. This will be useful to simplify the serialization of ControlValue instances. The size computation for the raw data is moved from the ControlSerializer, which is updated accordingly to use the data() function in order to access the size. Simplification of the ControlSerializer will happen in a subsequent change. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2020-03-06libcamera: controls: Move Control constructor to controls.hLaurent Pinchart
To avoid defining all specializations of the Control constructor manually, move the definition of those functions to controls.h and turn them into a single template function. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2020-03-06libcamera: controls: Move ControlValue constructor to controls.hLaurent Pinchart
To avoid defining all specializations of the ControlValue constructor manually, move the definition of those functions to controls.h and turn them into a single template function. The default constructor is still kept in controls.cpp. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2020-03-06libcamera: controls: Move ControlValue get() and set() to controls.hLaurent Pinchart
To avoid defining all specializations of ControlValue::get() and ControlValue::set() manually, move the definition of those functions to controls.h and turn them into single template functions. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2020-03-06libcamera: controls: Return control by valueLaurent Pinchart
The ControlList::get() and ControlValue::get() methods return the control value by reference. This requires the ControlValue class to store the control value in the same form as the one returned by those functions. For the array controls that are soon to be added, the ControlValue class would need to store a span<> instance in addition to the control value itself, which would increase the required storage space. Prepare for support of array controls by returning from get() by value. As all control values are 8 bytes at most, this doesn't affect efficiency negatively. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
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