90 lines
2.5 KiB
C
90 lines
2.5 KiB
C
#ifndef _UVC_QUEUE_H_
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#define _UVC_QUEUE_H_
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#ifdef __KERNEL__
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#include <linux/kernel.h>
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#include <linux/poll.h>
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#include <linux/videodev2.h>
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/* Maximum frame size in bytes, for sanity checking. */
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#define UVC_MAX_FRAME_SIZE (16*1024*1024)
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/* Maximum number of video buffers. */
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#define UVC_MAX_VIDEO_BUFFERS 32
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/* ------------------------------------------------------------------------
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* Structures.
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*/
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enum uvc_buffer_state {
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UVC_BUF_STATE_IDLE = 0,
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UVC_BUF_STATE_QUEUED = 1,
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UVC_BUF_STATE_ACTIVE = 2,
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UVC_BUF_STATE_DONE = 3,
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UVC_BUF_STATE_ERROR = 4,
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};
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struct uvc_buffer {
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unsigned long vma_use_count;
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struct list_head stream;
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/* Touched by interrupt handler. */
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struct v4l2_buffer buf;
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struct list_head queue;
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wait_queue_head_t wait;
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enum uvc_buffer_state state;
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};
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#define UVC_QUEUE_STREAMING (1 << 0)
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#define UVC_QUEUE_DISCONNECTED (1 << 1)
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#define UVC_QUEUE_DROP_INCOMPLETE (1 << 2)
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#define UVC_QUEUE_PAUSED (1 << 3)
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struct uvc_video_queue {
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enum v4l2_buf_type type;
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void *mem;
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unsigned int flags;
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__u32 sequence;
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unsigned int count;
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unsigned int buf_size;
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unsigned int buf_used;
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struct uvc_buffer buffer[UVC_MAX_VIDEO_BUFFERS];
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struct mutex mutex; /* protects buffers and mainqueue */
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spinlock_t irqlock; /* protects irqqueue */
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struct list_head mainqueue;
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struct list_head irqqueue;
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};
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extern void uvc_queue_init(struct uvc_video_queue *queue,
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enum v4l2_buf_type type);
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extern int uvc_alloc_buffers(struct uvc_video_queue *queue,
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unsigned int nbuffers, unsigned int buflength);
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extern int uvc_free_buffers(struct uvc_video_queue *queue);
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extern int uvc_query_buffer(struct uvc_video_queue *queue,
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struct v4l2_buffer *v4l2_buf);
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extern int uvc_queue_buffer(struct uvc_video_queue *queue,
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struct v4l2_buffer *v4l2_buf);
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extern int uvc_dequeue_buffer(struct uvc_video_queue *queue,
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struct v4l2_buffer *v4l2_buf, int nonblocking);
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extern int uvc_queue_enable(struct uvc_video_queue *queue, int enable);
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extern void uvc_queue_cancel(struct uvc_video_queue *queue, int disconnect);
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extern struct uvc_buffer *uvc_queue_next_buffer(struct uvc_video_queue *queue,
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struct uvc_buffer *buf);
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extern unsigned int uvc_queue_poll(struct uvc_video_queue *queue,
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struct file *file, poll_table *wait);
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extern int uvc_queue_mmap(struct uvc_video_queue *queue,
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struct vm_area_struct *vma);
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static inline int uvc_queue_streaming(struct uvc_video_queue *queue)
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{
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return queue->flags & UVC_QUEUE_STREAMING;
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}
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extern struct uvc_buffer *uvc_queue_head(struct uvc_video_queue *queue);
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#endif /* __KERNEL__ */
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#endif /* _UVC_QUEUE_H_ */
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