mirror of https://gitee.com/openkylin/linux.git
114 lines
4.0 KiB
C
114 lines
4.0 KiB
C
/*
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* videobuf2-v4l2.h - V4L2 driver helper framework
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*
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* Copyright (C) 2010 Samsung Electronics
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*
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* Author: Pawel Osciak <pawel@osciak.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation.
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*/
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#ifndef _MEDIA_VIDEOBUF2_V4L2_H
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#define _MEDIA_VIDEOBUF2_V4L2_H
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#include <linux/videodev2.h>
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#include <media/videobuf2-core.h>
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#if VB2_MAX_FRAME != VIDEO_MAX_FRAME
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#error VB2_MAX_FRAME != VIDEO_MAX_FRAME
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#endif
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#if VB2_MAX_PLANES != VIDEO_MAX_PLANES
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#error VB2_MAX_PLANES != VIDEO_MAX_PLANES
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#endif
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/**
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* struct vb2_v4l2_buffer - video buffer information for v4l2
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* @vb2_buf: video buffer 2
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* @flags: buffer informational flags
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* @field: enum v4l2_field; field order of the image in the buffer
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* @timecode: frame timecode
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* @sequence: sequence count of this frame
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* Should contain enough information to be able to cover all the fields
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* of struct v4l2_buffer at videodev2.h
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*/
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struct vb2_v4l2_buffer {
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struct vb2_buffer vb2_buf;
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__u32 flags;
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__u32 field;
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struct v4l2_timecode timecode;
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__u32 sequence;
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};
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/*
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* to_vb2_v4l2_buffer() - cast struct vb2_buffer * to struct vb2_v4l2_buffer *
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*/
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#define to_vb2_v4l2_buffer(vb) \
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container_of(vb, struct vb2_v4l2_buffer, vb2_buf)
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int vb2_querybuf(struct vb2_queue *q, struct v4l2_buffer *b);
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int vb2_reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req);
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int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create);
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int vb2_prepare_buf(struct vb2_queue *q, struct v4l2_buffer *b);
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int vb2_qbuf(struct vb2_queue *q, struct v4l2_buffer *b);
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int vb2_expbuf(struct vb2_queue *q, struct v4l2_exportbuffer *eb);
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int vb2_dqbuf(struct vb2_queue *q, struct v4l2_buffer *b, bool nonblocking);
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int vb2_streamon(struct vb2_queue *q, enum v4l2_buf_type type);
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int vb2_streamoff(struct vb2_queue *q, enum v4l2_buf_type type);
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int __must_check vb2_queue_init(struct vb2_queue *q);
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void vb2_queue_release(struct vb2_queue *q);
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unsigned int vb2_poll(struct vb2_queue *q, struct file *file,
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poll_table *wait);
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/*
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* The following functions are not part of the vb2 core API, but are simple
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* helper functions that you can use in your struct v4l2_file_operations,
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* struct v4l2_ioctl_ops and struct vb2_ops. They will serialize if vb2_queue->lock
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* or video_device->lock is set, and they will set and test vb2_queue->owner
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* to check if the calling filehandle is permitted to do the queuing operation.
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*/
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/* struct v4l2_ioctl_ops helpers */
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int vb2_ioctl_reqbufs(struct file *file, void *priv,
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struct v4l2_requestbuffers *p);
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int vb2_ioctl_create_bufs(struct file *file, void *priv,
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struct v4l2_create_buffers *p);
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int vb2_ioctl_prepare_buf(struct file *file, void *priv,
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struct v4l2_buffer *p);
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int vb2_ioctl_querybuf(struct file *file, void *priv, struct v4l2_buffer *p);
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int vb2_ioctl_qbuf(struct file *file, void *priv, struct v4l2_buffer *p);
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int vb2_ioctl_dqbuf(struct file *file, void *priv, struct v4l2_buffer *p);
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int vb2_ioctl_streamon(struct file *file, void *priv, enum v4l2_buf_type i);
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int vb2_ioctl_streamoff(struct file *file, void *priv, enum v4l2_buf_type i);
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int vb2_ioctl_expbuf(struct file *file, void *priv,
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struct v4l2_exportbuffer *p);
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/* struct v4l2_file_operations helpers */
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int vb2_fop_mmap(struct file *file, struct vm_area_struct *vma);
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int vb2_fop_release(struct file *file);
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int _vb2_fop_release(struct file *file, struct mutex *lock);
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ssize_t vb2_fop_write(struct file *file, const char __user *buf,
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size_t count, loff_t *ppos);
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ssize_t vb2_fop_read(struct file *file, char __user *buf,
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size_t count, loff_t *ppos);
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unsigned int vb2_fop_poll(struct file *file, poll_table *wait);
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#ifndef CONFIG_MMU
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unsigned long vb2_fop_get_unmapped_area(struct file *file, unsigned long addr,
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unsigned long len, unsigned long pgoff, unsigned long flags);
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#endif
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/* struct vb2_ops helpers, only use if vq->lock is non-NULL. */
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void vb2_ops_wait_prepare(struct vb2_queue *vq);
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void vb2_ops_wait_finish(struct vb2_queue *vq);
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#endif /* _MEDIA_VIDEOBUF2_V4L2_H */
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