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* Broadcom BM2835 V4L2 driver
*
* Copyright © 2013 Raspberry Pi (Trading) Ltd.
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive
* for more details.
*
* Authors: Vincent Sanders <vincent.sanders@collabora.co.uk>
* Dave Stevenson <dsteve@broadcom.com>
* Simon Mellor <simellor@broadcom.com>
* Luke Diamand <luked@broadcom.com>
*/
/* MMAL_PORT_TYPE_T */
enum mmal_port_type {
MMAL_PORT_TYPE_UNKNOWN = 0, /**< Unknown port type */
MMAL_PORT_TYPE_CONTROL, /**< Control port */
MMAL_PORT_TYPE_INPUT, /**< Input port */
MMAL_PORT_TYPE_OUTPUT, /**< Output port */
MMAL_PORT_TYPE_CLOCK, /**< Clock port */
};
/** The port is pass-through and doesn't need buffer headers allocated */
#define MMAL_PORT_CAPABILITY_PASSTHROUGH 0x01
/** The port wants to allocate the buffer payloads.
* This signals a preference that payload allocation should be done
* on this port for efficiency reasons.
*/
#define MMAL_PORT_CAPABILITY_ALLOCATION 0x02
/** The port supports format change events.
* This applies to input ports and is used to let the client know
* whether the port supports being reconfigured via a format
* change event (i.e. without having to disable the port).
*/
#define MMAL_PORT_CAPABILITY_SUPPORTS_EVENT_FORMAT_CHANGE 0x04
/* mmal port structure (MMAL_PORT_T)
*
* most elements are informational only, the pointer values for
* interogation messages are generally provided as additional
* strucures within the message. When used to set values only teh
* buffer_num, buffer_size and userdata parameters are writable.
*/
struct mmal_port {
u32 priv; /* Private member used by the framework */
u32 name; /* Port name. Used for debugging purposes (RO) */
u32 type; /* Type of the port (RO) enum mmal_port_type */
u16 index; /* Index of the port in its type list (RO) */
u16 index_all; /* Index of the port in the list of all ports (RO) */
u32 is_enabled; /* Indicates whether the port is enabled or not (RO) */
u32 format; /* Format of the elementary stream */
u32 buffer_num_min; /* Minimum number of buffers the port
* requires (RO). This is set by the
* component.
*/
u32 buffer_size_min; /* Minimum size of buffers the port
* requires (RO). This is set by the
* component.
*/
u32 buffer_alignment_min; /* Minimum alignment requirement for
* the buffers (RO). A value of
* zero means no special alignment
* requirements. This is set by the
* component.
*/
u32 buffer_num_recommended; /* Number of buffers the port
* recommends for optimal
* performance (RO). A value of
* zero means no special
* recommendation. This is set
* by the component.
*/
u32 buffer_size_recommended; /* Size of buffers the port
* recommends for optimal
* performance (RO). A value of
* zero means no special
* recommendation. This is set
* by the component.
*/
u32 buffer_num; /* Actual number of buffers the port will use.
* This is set by the client.
*/
u32 buffer_size; /* Actual maximum size of the buffers that
* will be sent to the port. This is set by
* the client.
*/
u32 component; /* Component this port belongs to (Read Only) */
u32 userdata; /* Field reserved for use by the client */
u32 capabilities; /* Flags describing the capabilities of a
* port (RO). Bitwise combination of \ref
* portcapabilities "Port capabilities"
* values.
*/
};
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