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-rw-r--r--src/libcamera/include/v4l2_videodevice.h5
-rw-r--r--src/libcamera/v4l2_videodevice.cpp48
2 files changed, 53 insertions, 0 deletions
diff --git a/src/libcamera/include/v4l2_videodevice.h b/src/libcamera/include/v4l2_videodevice.h
index e4d35ab3..fcf07264 100644
--- a/src/libcamera/include/v4l2_videodevice.h
+++ b/src/libcamera/include/v4l2_videodevice.h
@@ -182,6 +182,9 @@ public:
int setFormat(V4L2DeviceFormat *format);
ImageFormats formats();
+ int setCrop(Rectangle *rect);
+ int setCompose(Rectangle *rect);
+
int exportBuffers(unsigned int count,
std::vector<std::unique_ptr<FrameBuffer>> *buffers);
int importBuffers(unsigned int count);
@@ -216,6 +219,8 @@ private:
std::vector<unsigned int> enumPixelformats();
std::vector<SizeRange> enumSizes(unsigned int pixelFormat);
+ int setSelection(unsigned int target, Rectangle *rect);
+
int requestBuffers(unsigned int count);
std::unique_ptr<FrameBuffer> createBuffer(const struct v4l2_buffer &buf);
FileDescriptor exportDmabufFd(unsigned int index, unsigned int plane);
diff --git a/src/libcamera/v4l2_videodevice.cpp b/src/libcamera/v4l2_videodevice.cpp
index b874f238..99470ce1 100644
--- a/src/libcamera/v4l2_videodevice.cpp
+++ b/src/libcamera/v4l2_videodevice.cpp
@@ -942,6 +942,54 @@ std::vector<SizeRange> V4L2VideoDevice::enumSizes(unsigned int pixelFormat)
return sizes;
}
+/**
+ * \brief Set a crop rectangle on the V4L2 video device node
+ * \param[inout] rect The rectangle describing the crop target area
+ * \return 0 on success or a negative error code otherwise
+ */
+int V4L2VideoDevice::setCrop(Rectangle *rect)
+{
+ return setSelection(V4L2_SEL_TGT_CROP, rect);
+}
+
+/**
+ * \brief Set a compose rectangle on the V4L2 video device node
+ * \param[inout] rect The rectangle describing the compose target area
+ * \return 0 on success or a negative error code otherwise
+ */
+int V4L2VideoDevice::setCompose(Rectangle *rect)
+{
+ return setSelection(V4L2_SEL_TGT_COMPOSE, rect);
+}
+
+int V4L2VideoDevice::setSelection(unsigned int target, Rectangle *rect)
+{
+ struct v4l2_selection sel = {};
+
+ sel.type = bufferType_;
+ sel.target = target;
+ sel.flags = 0;
+
+ sel.r.left = rect->x;
+ sel.r.top = rect->y;
+ sel.r.width = rect->w;
+ sel.r.height = rect->h;
+
+ int ret = ioctl(VIDIOC_S_SELECTION, &sel);
+ if (ret < 0) {
+ LOG(V4L2, Error) << "Unable to set rectangle " << target
+ << ": " << strerror(-ret);
+ return ret;
+ }
+
+ rect->x = sel.r.left;
+ rect->y = sel.r.top;
+ rect->w = sel.r.width;
+ rect->h = sel.r.height;
+
+ return 0;
+}
+
int V4L2VideoDevice::requestBuffers(unsigned int count)
{
struct v4l2_requestbuffers rb = {};