diff options
Diffstat (limited to 'src/libcamera/v4l2_subdevice.cpp')
| -rw-r--r-- | src/libcamera/v4l2_subdevice.cpp | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/src/libcamera/v4l2_subdevice.cpp b/src/libcamera/v4l2_subdevice.cpp index 023e2328..a0cc5eb4 100644 --- a/src/libcamera/v4l2_subdevice.cpp +++ b/src/libcamera/v4l2_subdevice.cpp @@ -443,6 +443,46 @@ int V4L2Subdevice::setFormat(unsigned int pad, V4L2SubdeviceFormat *format, } /** + * \brief Retrieve the subdevice's internal routing table + * \param[out] routes 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(std::vector<struct v4l2_subdev_route> *routes, + Whence whence) +{ + struct v4l2_subdev_routing rt = {}; + + rt.which = whence == ActiveFormat ? V4L2_SUBDEV_FORMAT_ACTIVE + : V4L2_SUBDEV_FORMAT_TRY; + + 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; + } + + routes->resize(rt.num_routes); + rt.routes = reinterpret_cast<uintptr_t>(routes->data()); + + ret = ioctl(VIDIOC_SUBDEV_G_ROUTING, &rt); + if (ret) { + LOG(V4L2, Error) + << "Failed to retrieve routes: " << strerror(-ret); + return ret; + } + + return 0; +} + +/** * \brief Create a new video subdevice instance from \a entity in media device * \a media * \param[in] media The media device where the entity is registered |