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/*
* Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
*
* This file is licensed under the terms of the GNU General Public License
* version 2. This program is licensed "as is" without any warranty of any
* kind, whether express or implied.
*
* This file specifies the custom ioctl API between a client "consumer"
* process and the V4L2-GFX driver. The consumer process should only use
* these APIs and will typically/ultimately be a GL application.
*
* There will also be a "producer" process which queues multimedia
* content to the driver, however, this will only use standard V4L2 APIs.
*/
#ifndef _OMAP_V4L2_GFX_H_
#define _OMAP_V4L2_GFX_H_
#include <linux/videodev.h>
/*
* @see V4L2_GFX_IOC_CONSUMER, struct v4l2_gfx_consumer_params
*/
enum v4l2_gfx_consumer_type {
/*
* Wait for the producer process to activate a video stream
*/
V4L2_GFX_CONSUMER_WAITSTREAM,
};
/*
* @see V4L2_GFX_IOC_CONSUMER
*/
struct v4l2_gfx_consumer_params {
/*
* @see v4l2_gfx_consumer_type
*/
int type; /* w */
/*
* If the consumer process is waiting the ioctl will block until the
* timeout expires or the expected event occurs, see the type field
*/
unsigned int timeout_ms; /* w */
/*
* If acquire_timeout_ms > 0 and no streaming activity has been detected
* for acquire_timeout_ms milliseconds the V4L2_GFX_IOC_ACQ ioctl will
* return with ETIMEOUT
*/
unsigned int acquire_timeout_ms; /* w */
};
/*
* @see V4L2_GFX_IOC_INFO
*/
struct v4l2_gfx_info_params {
/*
* Return how many times the device has been opened, this number will
* decrement when the device is closed.
*
* One use for this might be to detect if a consumer or producer is
* active and in the process of setting up a stream. However this could
* be unreliable if the processes are in the process of closing / crashing.
*
* Obviously this value will always be at least one i.e. the process
* issuing the ioctl opens the device.
*/
unsigned int opencnt; /* r */
};
/*
* @see V4L2_GFX_IOC_PRODUCER
*/
struct v4l2_gfx_producer_params {
/*
* If set mark the producer side as open, if not set mark as closed.
* For Android we need this because the mediaserver won't close the
* driver.
*/
#define V4L2_GFX_PRODUCER_MASK_OPEN 0x1
unsigned int flags; /* w */
};
struct v4l2_gfx_buf_params {
/*
* Buffer index.
*
* On acquire, when the ioctl returns the bufid field will be filled in
* with the next buffer with data available.
*
* On release, the consumer process just specifies the buffer to release
* which usually is the last acquired buffer index.
*/
int bufid; /* r/w */
/*
* Cropping information
* For the acquire ioctl only
*/
int crop_top; /* r */
int crop_left; /* r */
int crop_width; /* r */
int crop_height; /* r */
};
/*
* This ioctl should be issued once by the consumer process before starting
* any rendering loop. It allows the process to wait for the producer process
* to become ready.
*
* @see struct v4l2_gfx_consumer_params
*
* Return value:
* Returns 0 if successful, or -1 on error, in which case errno indicates
* the error.
*/
#define V4L2_GFX_IOC_CONSUMER _IOWR ('v', BASE_VIDIOCPRIVATE+0, \
struct v4l2_gfx_consumer_params)
/*
* Acquire the buffer to be rendered and its properties.
*
* @see struct v4l2_gfx_buf_params
*
* Return value:
* Returns 0 if successful, or -1 on error, in which case errno indicates
* the error.
*
* ETIMEDOUT If acquire_timeout_ms is set via V4L2_GFX_IOC_CONSUMER
* this error code can be returned.
* ENODEV If the producer side of the stream stops this error will
* be returned.
*/
#define V4L2_GFX_IOC_ACQ _IOR ('v', BASE_VIDIOCPRIVATE+1, \
struct v4l2_gfx_buf_params)
/*
* Release the buffer that was rendered
*
* @see struct v4l2_gfx_buf_params
*
* Return value:
* Returns 0 if successful, or -1 on error, in which case errno indicates
* the error.
*
* ETIMEDOUT It took longer than 16ms for the app to render the frame
* (This will probably go away to avoid render loop stalls)
* EINVAL Attempted to release an invalid buffer index.
*/
#define V4L2_GFX_IOC_REL _IOW ('v', BASE_VIDIOCPRIVATE+2, \
struct v4l2_gfx_buf_params)
/*
* Ioctl used to get information about the device
*
* @see struct v4l2_gfx_info_params
*
* Return value:
* Returns 0 if successful, or -1 on error, in which case errno indicates
* the error.
*/
#define V4L2_GFX_IOC_INFO _IOWR ('v', BASE_VIDIOCPRIVATE+3, \
struct v4l2_gfx_info_params)
/*
* Ioctl used to set producer params
*
* @see struct v4l2_gfx_producer_params
*
* Return value:
* Returns 0 if successful, or -1 on error, in which case errno indicates
* the error.
*/
#define V4L2_GFX_IOC_PRODUCER _IOWR ('v', BASE_VIDIOCPRIVATE+4, \
struct v4l2_gfx_producer_params)
#endif // _OMAP_V4L2_GFX_H_
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