From 8df593841dc81a015906f8273eccd3de2c99f5ca Mon Sep 17 00:00:00 2001 From: Paul Elder Date: Thu, 4 Jun 2020 18:13:52 +0900 Subject: v4l2: v4l2_compat: Add eventfd signaling to support polling To support polling, we need to be able to signal when data is available to be read (POLLIN), as well as events (POLLPRI). Add the necessary calls to eventfd to allow signaling POLLIN. We signal POLLIN by writing writing to the eventfd, and clear it by reading from the eventfd, upon VIDIOC_DQBUF. Note that eventfd does not support signaling POLLPRI, so we don't yet support V4L2 events. Signed-off-by: Paul Elder Reviewed-by: Laurent Pinchart --- src/v4l2/v4l2_camera_proxy.cpp | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'src/v4l2/v4l2_camera_proxy.cpp') diff --git a/src/v4l2/v4l2_camera_proxy.cpp b/src/v4l2/v4l2_camera_proxy.cpp index cbe9e026..7ee4c0cb 100644 --- a/src/v4l2/v4l2_camera_proxy.cpp +++ b/src/v4l2/v4l2_camera_proxy.cpp @@ -13,6 +13,7 @@ #include #include #include +#include #include #include @@ -451,6 +452,9 @@ int V4L2CameraProxy::vidioc_dqbuf(struct v4l2_buffer *arg) currentBuf_ = (currentBuf_ + 1) % bufferCount_; + uint64_t data; + ::read(efd_, &data, sizeof(data)); + return 0; } @@ -529,6 +533,12 @@ int V4L2CameraProxy::ioctl(unsigned long request, void *arg) return ret; } +void V4L2CameraProxy::bind(int fd) +{ + efd_ = fd; + vcam_->bind(fd); +} + struct PixelFormatPlaneInfo { unsigned int bitsPerPixel; unsigned int hSubSampling; -- cgit v1.2.1