Paul Elder
323a53c232
For handling try_fmt, the values should be filled in by validating the stream configuration, and not by recalculating them or manually checking against the cached list of formats and sizes. Add a new V4L2Camera::validateConfiguration() function to validate a configuration and use it to obtain size, format, stride, and frameSize values. If the format negotiation fails, return error from try_fmt and s_fmt. Signed-off-by: Paul Elder <paul.elder@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
106 lines
3.4 KiB
C++
106 lines
3.4 KiB
C++
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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/*
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* Copyright (C) 2019, Google Inc.
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*
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* v4l2_camera_proxy.h - Proxy to V4L2 compatibility camera
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*/
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#ifndef __V4L2_CAMERA_PROXY_H__
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#define __V4L2_CAMERA_PROXY_H__
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#include <linux/videodev2.h>
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#include <map>
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#include <memory>
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#include <set>
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#include <sys/mman.h>
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#include <sys/types.h>
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#include <vector>
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#include <libcamera/camera.h>
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#include "v4l2_camera.h"
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using namespace libcamera;
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class V4L2CameraFile;
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class V4L2CameraProxy
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{
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public:
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V4L2CameraProxy(unsigned int index, std::shared_ptr<Camera> camera);
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int open(V4L2CameraFile *file);
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void close(V4L2CameraFile *file);
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void *mmap(void *addr, size_t length, int prot, int flags, off64_t offset);
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int munmap(void *addr, size_t length);
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int ioctl(V4L2CameraFile *file, unsigned long request, void *arg);
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private:
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bool validateBufferType(uint32_t type);
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bool validateMemoryType(uint32_t memory);
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void setFmtFromConfig(StreamConfiguration &streamConfig);
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void querycap(std::shared_ptr<Camera> camera);
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int tryFormat(struct v4l2_format *arg);
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enum v4l2_priority maxPriority();
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void updateBuffers();
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void freeBuffers();
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int vidioc_querycap(struct v4l2_capability *arg);
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int vidioc_enum_framesizes(V4L2CameraFile *file, struct v4l2_frmsizeenum *arg);
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int vidioc_enum_fmt(V4L2CameraFile *file, struct v4l2_fmtdesc *arg);
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int vidioc_g_fmt(V4L2CameraFile *file, struct v4l2_format *arg);
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int vidioc_s_fmt(V4L2CameraFile *file, struct v4l2_format *arg);
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int vidioc_try_fmt(V4L2CameraFile *file, struct v4l2_format *arg);
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int vidioc_g_priority(V4L2CameraFile *file, enum v4l2_priority *arg);
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int vidioc_s_priority(V4L2CameraFile *file, enum v4l2_priority *arg);
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int vidioc_enuminput(V4L2CameraFile *file, struct v4l2_input *arg);
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int vidioc_g_input(V4L2CameraFile *file, int *arg);
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int vidioc_s_input(V4L2CameraFile *file, int *arg);
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int vidioc_reqbufs(V4L2CameraFile *file, struct v4l2_requestbuffers *arg);
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int vidioc_querybuf(V4L2CameraFile *file, struct v4l2_buffer *arg);
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int vidioc_qbuf(V4L2CameraFile *file, struct v4l2_buffer *arg);
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int vidioc_dqbuf(V4L2CameraFile *file, struct v4l2_buffer *arg, MutexLocker *locker);
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int vidioc_streamon(V4L2CameraFile *file, int *arg);
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int vidioc_streamoff(V4L2CameraFile *file, int *arg);
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bool hasOwnership(V4L2CameraFile *file);
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int acquire(V4L2CameraFile *file);
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void release(V4L2CameraFile *file);
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static const std::set<unsigned long> supportedIoctls_;
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unsigned int refcount_;
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unsigned int index_;
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struct v4l2_format curV4L2Format_;
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StreamConfiguration streamConfig_;
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struct v4l2_capability capabilities_;
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unsigned int bufferCount_;
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unsigned int currentBuf_;
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unsigned int sizeimage_;
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std::vector<struct v4l2_buffer> buffers_;
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std::map<void *, unsigned int> mmaps_;
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std::set<V4L2CameraFile *> files_;
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std::unique_ptr<V4L2Camera> vcam_;
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/*
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* This is the exclusive owner of this V4L2CameraProxy instance.
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* When there is no owner, anybody can call any ioctl before reqbufs.
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* The first file to call reqbufs with count > 0 or s_fmt will become
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* the owner, and when the owner calls reqbufs with count = 0 it will
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* release ownership. Any buffer-related ioctl (except querybuf) or
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* s_fmt that is called by a non-owner while there exists an owner
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* will return -EBUSY.
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*/
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V4L2CameraFile *owner_;
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/* This mutex is to serialize access to the proxy. */
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Mutex proxyMutex_;
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};
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#endif /* __V4L2_CAMERA_PROXY_H__ */
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