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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* UVC stream handling
*
* Copyright (C) 2010-2018 Laurent Pinchart
*
* Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
*/
#ifndef __STREAM_H__
#define __STREAM_H__
struct events;
struct uvc_function_config;
struct uvc_stream;
struct v4l2_pix_format;
struct video_source;
/*
* uvc_stream_new - Create a new UVC stream
* @uvc_device: Filename of UVC device node
*
* Create a new UVC stream to handle the UVC function corresponding to the video
* device node @uvc_device.
*
* Streams allocated with this function can be deleted with uvc_stream_delete().
*
* On success, returns a pointer to newly allocated and populated struct uvc_stream.
* On failure, returns NULL.
*/
struct uvc_stream *uvc_stream_new(const char *uvc_device);
/*
* uvc_stream_init_uvc - Initialize a UVC stream
* @stream: the UVC stream
* @fc: UVC function configuration
*
* Before it can be used, a UVC stream has to be initialized by calling this
* function with a UVC function configuration @fc. The function configuration
* contains all the parameters of the UVC function that will be handled by the
* UVC stream. It can be parsed from the UVC function ConfigFS directory using
* configfs_parse_uvc_function().
*
* uvc_stream_init_uvc() also registers UVC event notifiers for the stream. The
* caller must have called the uvc_stream_set_event_handler() function first,
* and ensure that the event handler is immediately usable. If the event loop is
* already running, all initialization steps required to handle events must be
* fully performed before calling this function.
*/
void uvc_stream_init_uvc(struct uvc_stream *stream,
struct uvc_function_config *fc);
/*
* uvc_stream_set_event_handler - Set an event handler for a stream
* @stream: the UVC stream
* @events: the event handler
*
* This function sets the event handler that the stream can use to be notified
* of file descriptor events.
*/
void uvc_stream_set_event_handler(struct uvc_stream *stream,
struct events *events);
void uvc_stream_set_video_source(struct uvc_stream *stream,
struct video_source *src);
/*
* uvc_stream_delete - Delete a UVC stream
* @stream: the UVC stream
*
* This functions deletes the @stream created with uvc_stream_new(). Upon return
* the stream object may be freed, the @stream pointer thus becomes invalid and
* the stream must not be touched anymore.
*
* Every stream allocated with uvc_stream_new() must be deleted when not needed
* anymore.
*/
void uvc_stream_delete(struct uvc_stream *stream);
/*
* uvc_stream_set_format - Set the active video format for the stream
* @stream: the UVC stream
* @format: the video stream format
*
* This function is called from the UVC protocol handler to configure the video
* format for the @stream. It must not be called directly by applications.
*
* Returns 0 on success, or a negative error code on failure.
*/
int uvc_stream_set_format(struct uvc_stream *stream,
const struct v4l2_pix_format *format);
/*
* uvc_stream_enable - Turn on/off video streaming for the UVC stream
* @stream: the UVC stream
* @enable: 0 to stop the stream, 1 to start it
*
* This function is called from the UVC protocol handler to start video transfer
* for the @stream. It must not be called directly by applications.
*/
void uvc_stream_enable(struct uvc_stream *stream, int enable);
#endif /* __STREAM_H__ */
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