diff options
| author | Laurent Pinchart <laurent.pinchart@ideasonboard.com> | 2024-09-25 20:56:52 +0300 |
|---|---|---|
| committer | Laurent Pinchart <laurent.pinchart@ideasonboard.com> | 2024-09-30 10:56:48 +0300 |
| commit | 4cb3380f4d5615f041ed5698eb1fd12b2e46a720 (patch) | |
| tree | 99d906bab219637cf9cb0aff53b786ca19650027 | |
| parent | b2538c80b96df937ff6fa823a489bf4710cee0e2 (diff) | |
libcamera: v4l2_videodevice: Add getSelection() function
The V4L2VideoDevice class implements setSelection() but not
getSelection(). The latter is useful for instance to query crop bounds.
Implement the function.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
| -rw-r--r-- | include/libcamera/internal/v4l2_videodevice.h | 1 | ||||
| -rw-r--r-- | src/libcamera/v4l2_videodevice.cpp | 32 |
2 files changed, 33 insertions, 0 deletions
diff --git a/include/libcamera/internal/v4l2_videodevice.h b/include/libcamera/internal/v4l2_videodevice.h index 9057be08..f021c2a0 100644 --- a/include/libcamera/internal/v4l2_videodevice.h +++ b/include/libcamera/internal/v4l2_videodevice.h @@ -208,6 +208,7 @@ public: int setFormat(V4L2DeviceFormat *format); Formats formats(uint32_t code = 0); + int getSelection(unsigned int target, Rectangle *rect); int setSelection(unsigned int target, Rectangle *rect); int allocateBuffers(unsigned int count, diff --git a/src/libcamera/v4l2_videodevice.cpp b/src/libcamera/v4l2_videodevice.cpp index 93cb1697..14eba056 100644 --- a/src/libcamera/v4l2_videodevice.cpp +++ b/src/libcamera/v4l2_videodevice.cpp @@ -1215,6 +1215,38 @@ std::vector<SizeRange> V4L2VideoDevice::enumSizes(V4L2PixelFormat pixelFormat) } /** + * \brief Get the selection rectangle for \a target + * \param[in] target The selection target defined by the V4L2_SEL_TGT_* flags + * \param[out] rect The selection rectangle to retrieve + * + * \todo Define a V4L2SelectionTarget enum for the selection target + * + * \return 0 on success or a negative error code otherwise + */ +int V4L2VideoDevice::getSelection(unsigned int target, Rectangle *rect) +{ + struct v4l2_selection sel = {}; + + sel.type = bufferType_; + sel.target = target; + sel.flags = 0; + + int ret = ioctl(VIDIOC_G_SELECTION, &sel); + if (ret < 0) { + LOG(V4L2, Error) << "Unable to get rectangle " << target + << ": " << strerror(-ret); + return ret; + } + + rect->x = sel.r.left; + rect->y = sel.r.top; + rect->width = sel.r.width; + rect->height = sel.r.height; + + return 0; +} + +/** * \brief Set a selection rectangle \a rect for \a target * \param[in] target The selection target defined by the V4L2_SEL_TGT_* flags * \param[inout] rect The selection rectangle to be applied |