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2022-11-22lib: uvc: Add control names in output printsDaniel Scally
It's easier to see what's going on at a glance when the output is human-readable, so replace the control codes with their names. Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Signed-off-by: Daniel Scally <dan.scally@ideasonboard.com> Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2022-11-22lib: uvc: Drop maxsizeDaniel Scally
The maxsize field of struct uvc_device is probably unecessary even if it weren't currently fixed at 0. It's used to set dwMaxVideoFrameSize in addition to the sizeimage member of a struct v4l2_pix_fmt (multiplied in the latter instance by 1.5x). The documentary definitions for those two values are such that they should be identical though, so simply set dwMaxVideoFrameSize to width*height*2 (to maintain commonality with other UVC Video devices) and use that to set the sizeimage. Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Signed-off-by: Daniel Scally <dan.scally@ideasonboard.com> Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2022-11-22lib: events: Use list_for_each_entry() instead of the _safe() versionDaniel Scally
For the UVC_EVENT_STREAMOFF event, the callback frees _other_ events because it's closing down the pipe. The use of the _safe() version of the list iterator results in a use-after-free of those events because they're fetched before the callback that frees them. The _safe() version is unecessary here; no other callback's behaviour requires it. Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Signed-off-by: Daniel Scally <dan.scally@ideasonboard.com> Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2022-11-22jpg-source: add jpg source classPaul Elder
The jpg_source class is an implementation of the video_source class that streams a still jpg image as video. Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Signed-off-by: Paul Elder <paul.elder@ideasonboard.com> Signed-off-by: Daniel Scally <dan.scally@ideasonboard.com> Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2022-11-22test-source: add test source classPaul Elder
The test_source class is an implementation of the video_source class that generates a test pattern in userspace to provide video. We have some operations which are implemented as no-ops. To quiet the compiler warnings this causes, flag their arguments as unused. Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Signed-off-by: Paul Elder <paul.elder@ideasonboard.com> Signed-off-by: Daniel Scally <dan.scally@ideasonboard.com> Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2022-11-22v4l2: write size value when dequeueing bufferPaul Elder
When we dequeue a buffer from a V4L2 device, it would be good to know the size of the buffer. Save it to our struct video_buffer when dequeueing. Reviewed-by: Daniel Scally <dan.scally@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Signed-off-by: Paul Elder <paul.elder@ideasonboard.com> Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2022-11-22v4l2: populate video_buffer mem field at dequeuePaul Elder
Our v4l2_queue_buffer and v4l2_dequeue_buffer functions give us a wrapper around the raw V4L2 ioctls with a wrapper struct video_buffer around the raw struct v4l2_buffer. The problem is that the video_buffer's mem field is never populated, so there's no way to access the mem that the buffer refers to given only the buffer. Populate the video_buffer's mem field at v4l2_dequeue_buffer based on the dequeued v4l2 buf's index. Reviewed-by: Daniel Scally <dan.scally@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Signed-off-by: Paul Elder <paul.elder@ideasonboard.com> Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2022-11-22stream: allow buffers to be allocated on uvc sidePaul Elder
We want to allow video sources whose data is generated in userspace. Currently buffers are allocated on the V4L2-backed video source and exported to the uvc-gadget's V4L2 device. Since a video source with data generated in userspace will not be backed by a V4L2 device, we allow a way for buffers to be allocated on uvc-gadget's V4L2 device. As a corollary, the way the buffers are passed has to be changed as well. Previously they were queued and dequeued between the V4L2 video source and uvc and vice versa. To allow a video source not backed by a V4L2 device, we allow an alternative flow where they are dequeued and queued from and to uvc, and giving a chance to the video source to fill the buffer in between. Reviewed-by: Daniel Scally <dan.scally@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Signed-off-by: Paul Elder <paul.elder@ideasonboard.com> Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2022-11-22video-source: add fill_bufferPaul Elder
We are preparing to allow video sources whose data is generated in userspace. To this end, add a fill_buffer function to video_source. Reviewed-by: Daniel Scally <dan.scally@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Signed-off-by: Paul Elder <paul.elder@ideasonboard.com> Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2022-11-22meson: Convert CMake to Meson build infrastructureKieran Bingham
Provide infrastructure to be able to build the uvc-gadget library as a shared object and an executable which links against this as a dependency to implment the reference 'uvc-gadget' application. All existing cmake infrastructure is removed. This removes custom glob support that was previously used by an early development for Android, which is expected to be re-added later when required. Reviewed-by: Daniel Scally <dan.scally@ideasonboard.com> Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2022-11-22main/lib: mark unused variablesKieran Bingham
Bringing in the meson infrastructure will enable extra warnings, including -Wunused... Directly reference the two locations that have known unused arguments. Reviewed-by: Daniel Scally <dan.scally@ideasonboard.com> Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2022-11-17lib: configfs: Use wildcard in path to gadget deviceDaniel Scally
At some point the kernel has been updated to include a .id descriptor in the gadget directory name - add that to uvc_find_video_device() so that the video node is located properly. Rather than hardcode a specific gadget (for instance with device name gadget.0) use a wildcard. This has the advantage of backwards compatability with older kernels that did not use the ID as part of the device name, though still limits us to supporting scenarios where only a single gadget is bound to the UDC. Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Signed-off-by: Daniel Scally <dan.scally@ideasonboard.com>
2022-11-17lib: v4l2: Set sizeimage during v4l2_set_format()Daniel Scally
videobuf2 relies on the sizeimage field to calculate buffer size when the format is MJPEG, because the bytes-per-line calculation is missing. Fill in that field as part of v4l2_set_format() so the API works correctly. Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Signed-off-by: Daniel Scally <dan.scally@ideasonboard.com>
2019-05-02configfs: parse mjpeg streaming formatPaul Elder
The MJPEG descriptor does not have a guidFormat, and so configfs doesn't have it either, but we currently error out if there is no guidFormat. To fix this, extract the stream type part of the real path, and if it is MJPEG then hardcode it, otherwise read the guid if it is uncompressed. This does mean that in configfs the MJPEG format descriptor path must be "mjpeg" for this to work, though this is already guranteed by configfs. Signed-off-by: Paul Elder <paul.elder@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2019-02-06uvc: reply with max frame rate in response to UVC_GET_MAXPaul Elder
Previously, the interval rate that would be selected and replied to the host in response to UVC_GET_MAX, UVC_GET_MIN, and UVC_GET_DEF were all the same and were the first interval rate. Assuming the interval rates are sorted in ascending order, this means that UVC_GET_MAX would always yield the minimum interval rate. Modify the call to uvc_fill_streaming_control such that UVC_GET_MAX will yield the maximum interval rate. Signed-off-by: Paul Elder <paul.elder@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2019-02-06stream, uvc: add uvc_stream_set_frame_ratePaul Elder
We would like to be able to set the frame rate of the video source of a stream. This patch adds such a function to set the source's frame rate from the stream. The frame rate is set right after the format is set. Signed-off-by: Paul Elder <paul.elder@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2019-02-06v4l2-source: implement set_frame_rate opPaul Elder
Implement the video source op set_frame_rate for v4l2-source video source. Signed-off-by: Paul Elder <paul.elder@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2019-02-06video-source: add video_source_set_frame_ratePaul Elder
We would like to be able to set the frame rate for video sources. This patch adds a set_frame_rate op for video sources, along with a wrapper to call video sources' set_frame_rate functions. Signed-off-by: Paul Elder <paul.elder@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2019-02-06v4l2: add v4l2_set_frame_ratePaul Elder
We would like to be able to set the frame rate of video sources. This patch adds such a function for v4l2-based video sources to use. Signed-off-by: Paul Elder <paul.elder@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
2018-07-31lib: configfs: Detect configfs mount pointKieran Bingham
Parse /proc/mounts to identify the correct mount location of the ConfigFS filesystem. Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2018-07-31lib: Compile custom glob() implementation for AndroidPaul Elder
The Android C library doesn't provide the glob() function which we use in the configfs code. Add conditional compilation to cmake such that a local copy of glob is automatically compiled if glob isn't provided. Signed-off-by: Paul Elder <paul.elder@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2018-07-31lib: glob: Fix compilation on AndroidLaurent Pinchart
The glibc glob() implementation doesn't compile on Android due to missing support for getlogin_r (before Android ABI 28) and to missing __THROW, __THROWNL and __attribute_noinline__ macros. getlogin_r is only used to implement support for the '~' path component which we don't use in the uvc-gadget library, so we can compile it out. The three macros can safely be defined as no-op. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2018-07-31lib: glob: Fix compilationLaurent Pinchart
The glibc glob() implementation seems to be meant to be compilable outside of glibc, but that clearly hasn't been tested for some time. Fix compilation. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2018-07-31lib: Import glob.c from glibc 2.26Laurent Pinchart
The Android libc implementation (bionic) doesn't provide the glob() function. To enable compilation of the UVC gadget library for Android, import the glibc glob() implementation. The glob.c and glob.h files are imported unmodified to ease copyright management, even if they don't compile as-is. Compilation will be fixed separately. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2018-07-31lib: configfs: Globalize nested configfs callback functionsPaul Elder
Android now uses clang as the default C compiler, and gcc support is deprecated. clang doesn't support nested functions, which were used to implement callback functions in the ConfigFS code. We thus move the callbacks to the global scope. Signed-off-by: Paul Elder <paul.elder@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2018-07-31lib: configfs: Fix asprintf return value usageKieran Bingham
The asprintf function returns -1, and leaves the first parameter undefined in case of an allocation error. This conflicts with the code's assumption that the parameter is set NULL on error. Check all return values of asprintf, and ensure that the string parameter is not used as a return value on error paths. Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2018-06-12uvc: check ioctl return value for errorPaul Elder
There is code that is meant to check for the error of an ioctl, but the return variable that it checks isn't actually assigned from the ioctl. Assign the return value before checking it. Signed-off-by: Paul Elder <paul.elder@ideasonboard.com> [Fixed error message] Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2018-06-12Import the g_uvc.h header from the kernel sourcesLaurent Pinchart
In order to avoid depending on an external kernel source tree recent enough to provide the g_uvc.h header, import in the the project. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2018-06-12lib: Relicense code under the LGPL-2.1+Laurent Pinchart
To allow usage of the UVC gadget library in closed-source or otherwise GPL-incompatible applications, relicense the library under the terms of the LGPL v2.1 or later, as published by the Free Software Foundation. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2018-06-12Update copyright dates and ownerLaurent Pinchart
Ideas on Board SPRL, the original copyright owner of the UVC gadget application code, has been dissolved. All company copyrights have been transferred to Laurent Pinchart. Update the copyright notices to accordingly. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2018-06-12Use SPDX headersLaurent Pinchart
Replace the boilerplate copyright headers with an SPDX header to ease license compliance. This doesn't change the license of any of the files. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
2018-06-12Split UVC gadget into a library and test applicationLaurent Pinchart
Split the project into a UVC gadget library and a test application. To avoid rolling out a custom build system, switch to CMake. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>