Hi Sakari,
On Friday 30 July 2010 16:00:31 Sakari Ailus wrote:
> Laurent Pinchart wrote:
[snip]
> > diff --git a/include/media/media-entity.h b/include/media/media-entity.h
> > new file mode 100644
> > index 0000000..37a25bf
> > --- /dev/null
> > +++ b/include/media/media-entity.h
> > @@ -0,0 +1,85 @@
> > +#ifndef _MEDIA_ENTITY_H
> > +#define _MEDIA_ENTITY_H
> > +
> > +#include <linux/list.h>
> > +
> > +#define MEDIA_ENTITY_TYPE_NODE (1 << 16)
>
> About that 16 there, could that be replaced by a #define instead? Like
> MEDIA_ENTITY_TYPE_SHIFT? (I don't think we'd need
> MEDIA_ENTITY_SUBTYPE_SHIFT.)
Agreed.
> > +#define MEDIA_ENTITY_TYPE_NODE_V4L (MEDIA_ENTITY_TYPE_NODE + 1)
> > +#define MEDIA_ENTITY_TYPE_NODE_FB (MEDIA_ENTITY_TYPE_NODE + 2)
> > +#define MEDIA_ENTITY_TYPE_NODE_ALSA (MEDIA_ENTITY_TYPE_NODE + 3)
> > +#define MEDIA_ENTITY_TYPE_NODE_DVB (MEDIA_ENTITY_TYPE_NODE + 4)
> > +
> > +#define MEDIA_ENTITY_TYPE_SUBDEV (2 << 16)
> > +#define MEDIA_ENTITY_TYPE_SUBDEV_VID_DECODER (MEDIA_ENTITY_TYPE_SUBDEV +
> > 1) +#define
> > MEDIA_ENTITY_TYPE_SUBDEV_VID_ENCODER (MEDIA_ENTITY_TYPE_SUBDEV + 2)
> > +#define MEDIA_ENTITY_TYPE_SUBDEV_MISC (MEDIA_ENTITY_TYPE_SUBDEV + 3)
+
> > +#define MEDIA_LINK_FLAG_ACTIVE (1 << 0)
> > +#define MEDIA_LINK_FLAG_IMMUTABLE (1 << 1)
> > +
> > +#define MEDIA_PAD_FLAG_INPUT (1 << 0)
> > +#define MEDIA_PAD_FLAG_OUTPUT (1 << 1)
> > +
> > +struct media_link {
> > + struct media_pad *source; /* Source pad */
> > + struct media_pad *sink; /* Sink pad */
> > + struct media_link *other; /* Link in the reverse direction */
> > + unsigned long flags; /* Link flags (MEDIA_LINK_FLAG_*) */
> > +};
> > +
> > +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_FLAG_*) */
> > +};
> > +
> > +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_ENTITY_TYPE_*) */
> > +
> > + u8 num_pads; /* Number of input and output pads */
>
> Hans suggested u16 for pads. This is a kernel structure but still it'd
> be good to keep them the same IMO, even if that u16 was there for the
> future.
>
> u8 is used on some function arguments as well for these purposes.
Will fix.
> > + u8 num_links; /* Number of existing links, both active
> > + * and inactive */
> > + u8 num_backlinks; /* Number of backlinks */
> > + u8 max_links; /* Maximum number of links */
>
> Same for these.
Agreed. The number of links is expected to be >= number of pads. I'll change
num_links, num_backlinks and max_links to u16 as well.
> > + struct media_pad *pads; /* Pads array (num_pads elements) */
> > + struct media_link *links; /* Links array (max_links elements)*/
> > +
> > + union {
> > + /* Node specifications */
> > + struct {
> > + u32 major;
> > + u32 minor;
>
> How about dev_t here?
dev_t doesn't seem to be a public kernel type.
> > + } v4l;
> > + struct {
> > + u32 major;
> > + u32 minor;
>
> And here.
>
> > + } fb;
> > + int alsa;
> > + int dvb;
> > +
> > + /* Sub-device specifications */
> > + /* Nothing needed yet */
> > + };
> > +};
--
Regards,
Laurent Pinchart
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