include/media/videobuf2-core.h

26  * enum vb2_memory - type of memory model used to make the buffers visible
31  * @VB2_MEMORY_MMAP:	The buffers are allocated by the Kernel and it is
33  *			also used when the user is using the buffers via
35  * @VB2_MEMORY_USERPTR:	The buffers was allocated in userspace and it is
37  * @VB2_MEMORY_DMABUF:	The buffers are passed to userspace via DMA buffer.
270 	 * queued_entry:	entry on the queued buffers list, which holds
271 	 *			all buffers queued from userspace
272 	 * done_entry:		entry on the list that stores all buffers ready
328  *			twice: if the original number of requested buffers
331  *			buffers to verify if that is OK.
332  *			The driver should return the required number of buffers
340  *			number of buffers that are being allocated. When called
379  *			buffers are being returned to their default %DEQUEUED
386  *			receive buffers with @buf_queue callback
388  *			number of already queued buffers in count parameter;
390  *			case all buffers that have been already given by
393  *			If you need a minimum number of buffers before you can
397  *			that many buffers have been queued up by userspace.
400  *			finish and give back all buffers it got from &buf_queue
409  *			if user pre-queued buffers before calling
475  * @bidirectional: when this flag is set the DMA direction for the buffers of
496  *		If this is 1, then you cannot queue buffers from a request.
499  *		If this is 1, then you cannot queue buffers directly.
508  * @owner:	The filehandle that 'owns' the buffers, i.e. the filehandle
528  * @gfp_flags:	additional gfp flags used when allocating the buffers.
531  * @min_buffers_needed: the minimum number of buffers needed before
533  *		cannot be started unless at least this number of buffers
538  * @mmap_lock:	private mutex used when buffers are allocated/freed/mmapped
542  * @num_buffers: number of allocated/used buffers
543  * @queued_list: list of buffers currently queued from userspace
544  * @queued_count: number of buffers queued and ready for streaming.
545  * @owned_by_drv_count: number of buffers owned by the driver
546  * @done_list:	list of buffers ready to be dequeued to userspace
548  * @done_wq:	waitqueue for processes waiting for buffers ready to be dequeued
554  *		buffers. Only set for capture queues if qbuf has not yet been
690  * by the means of &vb2_ops->buf_queue callback. Only buffers previously queued
695  * cannot be started for some reason. In that case the buffers should be
701  * vb2_discard_done() - discard all buffers marked as DONE.
705  * discards all 'done' buffers as they would be too old to be requested after
715  * vb2_wait_for_all_buffers() - wait until all buffers are given back to vb2.
718  * This function will wait until all buffers that have been given to the driver
756  * #) negotiates number of buffers and planes per buffer with the driver
774  * vb2_core_create_bufs() - Allocate buffers and any required auxiliary structs
856  *		 buffers ready for dequeuing are present. Normally the driver
958  * buffers will return %-EIO.
968  * vb2_mmap() - map video buffers into application address space.
974  * This function maps one plane of one of the available video buffers to
993  * vb2_get_unmapped_area - map video buffers into application address space.
1122  * This function checks if queue has any buffers allocated.
1267  * vb2_request_buffer_cnt() - return the number of buffers in the request