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authorJacopo Mondi <jacopo@jmondi.org>2022-03-30 12:27:03 +0200
committerLaurent Pinchart <laurent.pinchart@ideasonboard.com>2022-08-03 17:44:28 +0300
commit495aac658dcedd7622b4108daf6c8ca4d8327599 (patch)
treed33e94bc936fa202a9aa1a88416739a8620da9bd /src
parent39d491761956b9c0e8c01ba5fc0a27558b90016e (diff)
libcamera: v4l2_subdevice: Add support for the V4L2 subdev routing API
Extend the V4L2Subdevice class to support getting and setting routing tables. Signed-off-by: Jacopo Mondi <jacopo@jmondi.org> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com> Tested-by: Jacopo Mondi <jacopo@jmondi.org>
Diffstat (limited to 'src')
-rw-r--r--src/libcamera/v4l2_subdevice.cpp106
1 files changed, 106 insertions, 0 deletions
diff --git a/src/libcamera/v4l2_subdevice.cpp b/src/libcamera/v4l2_subdevice.cpp
index a1672b23..e5d20f2c 100644
--- a/src/libcamera/v4l2_subdevice.cpp
+++ b/src/libcamera/v4l2_subdevice.cpp
@@ -289,6 +289,33 @@ std::ostream &operator<<(std::ostream &out, const V4L2SubdeviceFormat &f)
*/
/**
+ * \class V4L2Subdevice::Routing
+ * \brief V4L2 subdevice routing table
+ *
+ * This class stores a subdevice routing table as a vector of routes.
+ */
+
+/**
+ * \brief Assemble and return a string describing the routing table
+ * \return A string describing the routing table
+ */
+std::string V4L2Subdevice::Routing::toString() const
+{
+ std::stringstream routing;
+
+ for (const auto &[i, route] : utils::enumerate(*this)) {
+ routing << "[" << i << "] "
+ << route.sink_pad << "/" << route.sink_stream << " -> "
+ << route.source_pad << "/" << route.source_stream
+ << " (" << utils::hex(route.flags) << ")";
+ if (i != size() - 1)
+ routing << ", ";
+ }
+
+ return routing.str();
+}
+
+/**
* \brief Create a V4L2 subdevice from a MediaEntity using its device node
* path
*/
@@ -518,6 +545,85 @@ int V4L2Subdevice::setFormat(unsigned int pad, V4L2SubdeviceFormat *format,
}
/**
+ * \brief Retrieve the subdevice's internal routing table
+ * \param[out] routing The routing table
+ * \param[in] whence The routing table to get, \ref V4L2Subdevice::ActiveFormat
+ * "ActiveFormat" or \ref V4L2Subdevice::TryFormat "TryFormat"
+ *
+ * \return 0 on success or a negative error code otherwise
+ */
+int V4L2Subdevice::getRouting(Routing *routing, Whence whence)
+{
+ if (!caps_.hasStreams())
+ return 0;
+
+ struct v4l2_subdev_routing rt = {};
+
+ rt.which = whence;
+
+ int ret = ioctl(VIDIOC_SUBDEV_G_ROUTING, &rt);
+ if (ret == 0 || ret == -ENOTTY)
+ return ret;
+
+ if (ret != -ENOSPC) {
+ LOG(V4L2, Error)
+ << "Failed to retrieve number of routes: "
+ << strerror(-ret);
+ return ret;
+ }
+
+ routing->resize(rt.num_routes);
+ rt.routes = reinterpret_cast<uintptr_t>(routing->data());
+
+ ret = ioctl(VIDIOC_SUBDEV_G_ROUTING, &rt);
+ if (ret) {
+ LOG(V4L2, Error)
+ << "Failed to retrieve routes: " << strerror(-ret);
+ return ret;
+ }
+
+ if (rt.num_routes != routing->size()) {
+ LOG(V4L2, Error) << "Invalid number of routes";
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+/**
+ * \brief Set a routing table on the V4L2 subdevice
+ * \param[inout] routing The routing table
+ * \param[in] whence The routing table to set, \ref V4L2Subdevice::ActiveFormat
+ * "ActiveFormat" or \ref V4L2Subdevice::TryFormat "TryFormat"
+ *
+ * Apply to the V4L2 subdevice the routing table \a routing and update its
+ * content to reflect the actually applied routing table as getRouting() would
+ * do.
+ *
+ * \return 0 on success or a negative error code otherwise
+ */
+int V4L2Subdevice::setRouting(Routing *routing, Whence whence)
+{
+ if (!caps_.hasStreams())
+ return 0;
+
+ struct v4l2_subdev_routing rt = {};
+ rt.which = whence;
+ rt.num_routes = routing->size();
+ rt.routes = reinterpret_cast<uintptr_t>(routing->data());
+
+ int ret = ioctl(VIDIOC_SUBDEV_S_ROUTING, &rt);
+ if (ret) {
+ LOG(V4L2, Error) << "Failed to set routes: " << strerror(-ret);
+ return ret;
+ }
+
+ routing->resize(rt.num_routes);
+
+ return 0;
+}
+
+/**
* \brief Retrieve the model name of the device
*
* The model name allows identification of the specific device model. This can