NekoCWD/libcamera
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v4l2: Support setting frame rate in the V4L2 Adaptation layer

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The V4L2 adaptation layer can already support streaming with components
such as OpenCV, however it is not accepting, or handling any requests to
configure the frame rate.

In V4L2 the frame rate is set by configuring the timeperframe component
of the v4l2_streamparm structure through the VIDIOC_S_PARM ioctl.

Extend the V4L2 compatibility layer to accept the VIDIOC_S_PARM ioctls
and provide an interface for setting controls on the V4L2Camera class to
set the requested rate when starting the camera.

Signed-off-by: Nejc Galof <galof.nejc@gmail.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
This commit is contained in:
Nejc Galof 2024-09-10 19:33:27 +02:00 • committed by Paul Elder
parent 5c5bc85082
commit 5456e02d3f
4 changed files with 39 additions and 3 deletions
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5
src/v4l2/v4l2_camera.h
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@ -16,6 +16,7 @@
#include <libcamera/base/shared_fd.h>
#include <libcamera/camera.h>
#include <libcamera/controls.h>
#include <libcamera/framebuffer.h>
#include <libcamera/framebuffer_allocator.h>
@ -50,6 +51,8 @@ public:
const libcamera::Size &size,
libcamera::StreamConfiguration *streamConfigOut);
libcamera::ControlList &controls() { return controls_; }
int allocBuffers(unsigned int count);
void freeBuffers();
int getBufferFd(unsigned int index);
@ -71,6 +74,8 @@ private:
std::shared_ptr<libcamera::Camera> camera_;
std::unique_ptr<libcamera::CameraConfiguration> config_;
libcamera::ControlList controls_;
bool isRunning_;
libcamera::Mutex bufferLock_;