[libcamera-devel,v3] v4l2: Support setting frame rate in the V4L2 Adaptation layer
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Message ID 20220225144507.69550-1-galof.nejc@gmail.com
State New
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Series
  • [libcamera-devel,v3] v4l2: Support setting frame rate in the V4L2 Adaptation layer
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Commit Message

Nejc Galof Feb. 25, 2022, 2:45 p.m. UTC 
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>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
---
 src/v4l2/v4l2_camera.cpp       | 12 +++++++++---
 src/v4l2/v4l2_camera.h         |  5 +++++
 src/v4l2/v4l2_camera_proxy.cpp | 24 ++++++++++++++++++++++++
 src/v4l2/v4l2_camera_proxy.h   |  1 +
 4 files changed, 39 insertions(+), 3 deletions(-)

Patch
diff mbox series 

diff --git a/src/v4l2/v4l2_camera.cpp b/src/v4l2/v4l2_camera.cpp
index e922b9e6..e4eb3a2b 100644
--- a/src/v4l2/v4l2_camera.cpp
+++ b/src/v4l2/v4l2_camera.cpp
@@ -12,13 +12,15 @@ 
 
 #include <libcamera/base/log.h>
 
+#include <libcamera/control_ids.h>
+
 using namespace libcamera;
 
 LOG_DECLARE_CATEGORY(V4L2Compat)
 
 V4L2Camera::V4L2Camera(std::shared_ptr<Camera> camera)
-	: camera_(camera), isRunning_(false), bufferAllocator_(nullptr),
-	  efd_(-1), bufferAvailableCount_(0)
+	: camera_(camera), controls_(controls::controls), isRunning_(false),
+	  bufferAllocator_(nullptr), efd_(-1), bufferAvailableCount_(0)
 {
 	camera_->requestCompleted.connect(this, &V4L2Camera::requestComplete);
 }
@@ -203,10 +205,12 @@  int V4L2Camera::streamOn()
 	if (isRunning_)
 		return 0;
 
-	int ret = camera_->start();
+	int ret = camera_->start(&controls_);
 	if (ret < 0)
 		return ret == -EACCES ? -EBUSY : ret;
 
+	controls_.clear();
+
 	isRunning_ = true;
 
 	for (Request *req : pendingRequests_) {
@@ -266,6 +270,8 @@  int V4L2Camera::qbuf(unsigned int index)
 		return 0;
 	}
 
+	request->controls().merge(std::move(controls_));
+
 	ret = camera_->queueRequest(request);
 	if (ret < 0) {
 		LOG(V4L2Compat, Error) << "Can't queue request";
diff --git a/src/v4l2/v4l2_camera.h b/src/v4l2/v4l2_camera.h
index 03e74118..4c203e31 100644
--- a/src/v4l2/v4l2_camera.h
+++ b/src/v4l2/v4l2_camera.h
@@ -15,6 +15,7 @@ 
 #include <libcamera/base/shared_fd.h>
 
 #include <libcamera/camera.h>
+#include <libcamera/controls.h>
 #include <libcamera/framebuffer.h>
 #include <libcamera/framebuffer_allocator.h>
 
@@ -49,6 +50,8 @@  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);
@@ -69,6 +72,8 @@  private:
 	std::shared_ptr<libcamera::Camera> camera_;
 	std::unique_ptr<libcamera::CameraConfiguration> config_;
 
+	libcamera::ControlList controls_;
+
 	bool isRunning_;
 
 	libcamera::Mutex bufferLock_;
diff --git a/src/v4l2/v4l2_camera_proxy.cpp b/src/v4l2/v4l2_camera_proxy.cpp
index 74bd54ce..493c41c0 100644
--- a/src/v4l2/v4l2_camera_proxy.cpp
+++ b/src/v4l2/v4l2_camera_proxy.cpp
@@ -18,6 +18,8 @@ 
 #include <unistd.h>
 
 #include <libcamera/camera.h>
+#include <libcamera/controls.h>
+#include <libcamera/control_ids.h>
 #include <libcamera/formats.h>
 
 #include <libcamera/base/log.h>
@@ -33,6 +35,7 @@ 
 #define KERNEL_VERSION(a, b, c) (((a) << 16) + ((b) << 8) + (c))
 
 using namespace libcamera;
+using namespace std::literals::chrono_literals;
 
 LOG_DECLARE_CATEGORY(V4L2Compat)
 
@@ -755,6 +758,23 @@  int V4L2CameraProxy::vidioc_streamoff(V4L2CameraFile *file, int *arg)
 	return ret;
 }
 
+int V4L2CameraProxy::vidioc_s_parm(V4L2CameraFile *file, struct v4l2_streamparm *arg)
+{
+	LOG(V4L2Compat, Debug)
+		<< "[" << file->description() << "] " << __func__ << "()";
+
+	if (!validateBufferType(arg->type))
+		return -EINVAL;
+
+	struct v4l2_fract *timeperframe = &arg->parm.capture.timeperframe;
+	utils::Duration frameDuration = 1.0s * timeperframe->numerator / timeperframe->denominator;
+
+	int64_t uDuration = frameDuration.get<std::micro>();
+	vcam_->controls().set(controls::FrameDurationLimits, { uDuration, uDuration });
+
+	return 0;
+}
+
 const std::set<unsigned long> V4L2CameraProxy::supportedIoctls_ = {
 	VIDIOC_QUERYCAP,
 	VIDIOC_ENUM_FRAMESIZES,
@@ -775,6 +795,7 @@  const std::set<unsigned long> V4L2CameraProxy::supportedIoctls_ = {
 	VIDIOC_EXPBUF,
 	VIDIOC_STREAMON,
 	VIDIOC_STREAMOFF,
+	VIDIOC_S_PARM,
 };
 
 int V4L2CameraProxy::ioctl(V4L2CameraFile *file, unsigned long request, void *arg)
@@ -852,6 +873,9 @@  int V4L2CameraProxy::ioctl(V4L2CameraFile *file, unsigned long request, void *ar
 	case VIDIOC_STREAMOFF:
 		ret = vidioc_streamoff(file, static_cast<int *>(arg));
 		break;
+	case VIDIOC_S_PARM:
+		ret = vidioc_s_parm(file, static_cast<struct v4l2_streamparm *>(arg));
+		break;
 	default:
 		ret = -ENOTTY;
 		break;
diff --git a/src/v4l2/v4l2_camera_proxy.h b/src/v4l2/v4l2_camera_proxy.h
index 76ca2d8a..c1aeaff9 100644
--- a/src/v4l2/v4l2_camera_proxy.h
+++ b/src/v4l2/v4l2_camera_proxy.h
@@ -65,6 +65,7 @@  private:
 	int vidioc_expbuf(V4L2CameraFile *file, struct v4l2_exportbuffer *arg);
 	int vidioc_streamon(V4L2CameraFile *file, int *arg);
 	int vidioc_streamoff(V4L2CameraFile *file, int *arg);
+	int vidioc_s_parm(V4L2CameraFile *file, struct v4l2_streamparm *arg);
 
 	bool hasOwnership(V4L2CameraFile *file);
 	int acquire(V4L2CameraFile *file);