virtio-camera.h

/*
 * Virtio Camera Device
 *
 * Copyright © 2022 Collabora, Ltd.
 *
 * This work is licensed under the terms of the GNU GPL, version 2.
 * See the COPYING file in the top-level directory.
 */

#ifndef QEMU_VIRTIO_CAMERA_H
#define QEMU_VIRTIO_CAMERA_H

#include "qemu/queue.h"
#include "qemu/uuid.h"
#include "hw/virtio/virtio.h"
#include "qom/object.h"

#include "standard-headers/linux/virtio_camera.h"

#define TYPE_VIRTIO_CAMERA "virtio-camera-device"
OBJECT_DECLARE_SIMPLE_TYPE(VirtIOCamera, VIRTIO_CAMERA)

#define VIRTIO_CAMERA_GET_PARENT_CLASS(obj) \
        OBJECT_GET_PARENT_CLASS(obj, TYPE_VIRTIO_CAMERA)

#define VIRTIO_CAMERA_NUM_V4L2_BUFFERS  3

struct virtio_camera_v4l2 {
    void *buffer_data[VIRTIO_CAMERA_NUM_V4L2_BUFFERS];
    size_t buffer_size[VIRTIO_CAMERA_NUM_V4L2_BUFFERS];
    unsigned int queue_buffer_index;
    char *dev_path;
    int fd;
};

struct virtio_camera_mem_buffer {
    QTAILQ_ENTRY(virtio_camera_mem_buffer) node;
    QTAILQ_ENTRY(virtio_camera_mem_buffer) capture_node;
    QemuUUID uuid;
    VirtQueueElement *capture_elem;
    unsigned int num_entries;
    struct iovec iov[];
};

struct VirtIOCamera {
    VirtIODevice parent_obj;
    VirtQueue *ctrl_vq;
    struct virtio_camera_v4l2 v4l2;
    struct virtio_camera_config config;
    QTAILQ_HEAD(, virtio_camera_mem_buffer) buflist;
    QTAILQ_HEAD(, virtio_camera_mem_buffer) capturelist;
    uint64_t mem_buf_uuid;
    bool streaming;
};

#endif