mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-06 18:44:19 +08:00
5a5394be30
Currently, there's no documentation for the structure. Add a kernel-doc nano documentation to it. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Acked-by: Hans Verkuil <hans.verkuil@cisco.com> Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
160 lines
5.2 KiB
C
160 lines
5.2 KiB
C
/*
|
|
* Media entity
|
|
*
|
|
* Copyright (C) 2010 Nokia Corporation
|
|
*
|
|
* Contacts: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
|
|
* Sakari Ailus <sakari.ailus@iki.fi>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
#ifndef _MEDIA_ENTITY_H
|
|
#define _MEDIA_ENTITY_H
|
|
|
|
#include <linux/bitops.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/list.h>
|
|
#include <linux/media.h>
|
|
|
|
struct media_pipeline {
|
|
};
|
|
|
|
struct media_link {
|
|
struct media_pad *source; /* Source pad */
|
|
struct media_pad *sink; /* Sink pad */
|
|
struct media_link *reverse; /* Link in the reverse direction */
|
|
unsigned long flags; /* Link flags (MEDIA_LNK_FL_*) */
|
|
};
|
|
|
|
struct media_pad {
|
|
struct media_entity *entity; /* Entity this pad belongs to */
|
|
u16 index; /* Pad index in the entity pads array */
|
|
unsigned long flags; /* Pad flags (MEDIA_PAD_FL_*) */
|
|
};
|
|
|
|
/**
|
|
* struct media_entity_operations - Media entity operations
|
|
* @link_setup: Notify the entity of link changes. The operation can
|
|
* return an error, in which case link setup will be
|
|
* cancelled. Optional.
|
|
* @link_validate: Return whether a link is valid from the entity point of
|
|
* view. The media_entity_pipeline_start() function
|
|
* validates all links by calling this operation. Optional.
|
|
*/
|
|
struct media_entity_operations {
|
|
int (*link_setup)(struct media_entity *entity,
|
|
const struct media_pad *local,
|
|
const struct media_pad *remote, u32 flags);
|
|
int (*link_validate)(struct media_link *link);
|
|
};
|
|
|
|
struct media_entity {
|
|
struct list_head list;
|
|
struct media_device *parent; /* Media device this entity belongs to*/
|
|
u32 id; /* Entity ID, unique in the parent media
|
|
* device context */
|
|
const char *name; /* Entity name */
|
|
u32 type; /* Entity type (MEDIA_ENT_T_*) */
|
|
u32 revision; /* Entity revision, driver specific */
|
|
unsigned long flags; /* Entity flags (MEDIA_ENT_FL_*) */
|
|
u32 group_id; /* Entity group ID */
|
|
|
|
u16 num_pads; /* Number of sink and source pads */
|
|
u16 num_links; /* Number of existing links, both
|
|
* enabled and disabled */
|
|
u16 num_backlinks; /* Number of backlinks */
|
|
u16 max_links; /* Maximum number of links */
|
|
|
|
struct media_pad *pads; /* Pads array (num_pads elements) */
|
|
struct media_link *links; /* Links array (max_links elements)*/
|
|
|
|
const struct media_entity_operations *ops; /* Entity operations */
|
|
|
|
/* Reference counts must never be negative, but are signed integers on
|
|
* purpose: a simple WARN_ON(<0) check can be used to detect reference
|
|
* count bugs that would make them negative.
|
|
*/
|
|
int stream_count; /* Stream count for the entity. */
|
|
int use_count; /* Use count for the entity. */
|
|
|
|
struct media_pipeline *pipe; /* Pipeline this entity belongs to. */
|
|
|
|
union {
|
|
/* Node specifications */
|
|
struct {
|
|
u32 major;
|
|
u32 minor;
|
|
} dev;
|
|
|
|
/* Sub-device specifications */
|
|
/* Nothing needed yet */
|
|
} info;
|
|
};
|
|
|
|
static inline u32 media_entity_type(struct media_entity *entity)
|
|
{
|
|
return entity->type & MEDIA_ENT_TYPE_MASK;
|
|
}
|
|
|
|
static inline u32 media_entity_subtype(struct media_entity *entity)
|
|
{
|
|
return entity->type & MEDIA_ENT_SUBTYPE_MASK;
|
|
}
|
|
|
|
#define MEDIA_ENTITY_ENUM_MAX_DEPTH 16
|
|
#define MEDIA_ENTITY_ENUM_MAX_ID 64
|
|
|
|
struct media_entity_graph {
|
|
struct {
|
|
struct media_entity *entity;
|
|
int link;
|
|
} stack[MEDIA_ENTITY_ENUM_MAX_DEPTH];
|
|
|
|
DECLARE_BITMAP(entities, MEDIA_ENTITY_ENUM_MAX_ID);
|
|
int top;
|
|
};
|
|
|
|
int media_entity_init(struct media_entity *entity, u16 num_pads,
|
|
struct media_pad *pads, u16 extra_links);
|
|
void media_entity_cleanup(struct media_entity *entity);
|
|
|
|
int media_entity_create_link(struct media_entity *source, u16 source_pad,
|
|
struct media_entity *sink, u16 sink_pad, u32 flags);
|
|
void __media_entity_remove_links(struct media_entity *entity);
|
|
void media_entity_remove_links(struct media_entity *entity);
|
|
|
|
int __media_entity_setup_link(struct media_link *link, u32 flags);
|
|
int media_entity_setup_link(struct media_link *link, u32 flags);
|
|
struct media_link *media_entity_find_link(struct media_pad *source,
|
|
struct media_pad *sink);
|
|
struct media_pad *media_entity_remote_pad(struct media_pad *pad);
|
|
|
|
struct media_entity *media_entity_get(struct media_entity *entity);
|
|
void media_entity_put(struct media_entity *entity);
|
|
|
|
void media_entity_graph_walk_start(struct media_entity_graph *graph,
|
|
struct media_entity *entity);
|
|
struct media_entity *
|
|
media_entity_graph_walk_next(struct media_entity_graph *graph);
|
|
__must_check int media_entity_pipeline_start(struct media_entity *entity,
|
|
struct media_pipeline *pipe);
|
|
void media_entity_pipeline_stop(struct media_entity *entity);
|
|
|
|
#define media_entity_call(entity, operation, args...) \
|
|
(((entity)->ops && (entity)->ops->operation) ? \
|
|
(entity)->ops->operation((entity) , ##args) : -ENOIOCTLCMD)
|
|
|
|
#endif
|