include/media/dmxdev.h

Source file repositories/reference/linux-study-clean/include/media/dmxdev.h

File Facts

System
Linux kernel
Corpus path
include/media/dmxdev.h
Extension
.h
Size
6008 bytes
Lines
214
Domain
Repository Root And Misc
Bucket
include
Inferred role
Repository Root And Misc: implementation source
Status
source implementation candidate

Why This File Exists

Top-level or miscellaneous repository surface. Use this as map coverage unless a later manual pass promotes the file into a deeper subsystem dossier.

Dependency Surface

Detected Declarations

Annotated Snippet

struct dmxdev_feed {
	u16 pid;
	struct dmx_ts_feed *ts;
	struct list_head next;
};

/**
 * struct dmxdev_filter - digital TV dmxdev filter
 *
 * @filter:	a union describing a dmxdev filter.
 *		Currently used only for section filters.
 * @filter.sec: a &struct dmx_section_filter pointer.
 *		For section filter only.
 * @feed:	a union describing a dmxdev feed.
 *		Depending on the filter type, it can be either
 *		@feed.ts or @feed.sec.
 * @feed.ts:	a &struct list_head list.
 *		For TS and PES feeds.
 * @feed.sec:	a &struct dmx_section_feed pointer.
 *		For section feed only.
 * @params:	a union describing dmxdev filter parameters.
 *		Depending on the filter type, it can be either
 *		@params.sec or @params.pes.
 * @params.sec:	a &struct dmx_sct_filter_params embedded struct.
 *		For section filter only.
 * @params.pes:	a &struct dmx_pes_filter_params embedded struct.
 *		For PES filter only.
 * @type:	type of the dmxdev filter, as defined by &enum dmxdev_type.
 * @state:	state of the dmxdev filter, as defined by &enum dmxdev_state.
 * @dev:	pointer to &struct dmxdev.
 * @buffer:	an embedded &struct dvb_ringbuffer buffer.
 * @vb2_ctx:	control struct for VB2 handler
 * @mutex:	protects the access to &struct dmxdev_filter.
 * @timer:	&struct timer_list embedded timer, used to check for
 *		feed timeouts.
 *		Only for section filter.
 * @todo:	index for the @secheader.
 *		Only for section filter.
 * @secheader:	buffer cache to parse the section header.
 *		Only for section filter.
 */
struct dmxdev_filter {
	union {
		struct dmx_section_filter *sec;
	} filter;

	union {
		/* list of TS and PES feeds (struct dmxdev_feed) */
		struct list_head ts;
		struct dmx_section_feed *sec;
	} feed;

	union {
		struct dmx_sct_filter_params sec;
		struct dmx_pes_filter_params pes;
	} params;

	enum dmxdev_type type;
	enum dmxdev_state state;
	struct dmxdev *dev;
	struct dvb_ringbuffer buffer;
	struct dvb_vb2_ctx vb2_ctx;

	struct mutex mutex;

	/* only for sections */
	struct timer_list timer;
	int todo;
	u8 secheader[3];
};

/**
 * struct dmxdev - Describes a digital TV demux device.
 *
 * @dvbdev:		pointer to &struct dvb_device associated with
 *			the demux device node.
 * @dvr_dvbdev:		pointer to &struct dvb_device associated with
 *			the dvr device node.
 * @filter:		pointer to &struct dmxdev_filter.
 * @demux:		pointer to &struct dmx_demux.
 * @filternum:		number of filters.
 * @capabilities:	demux capabilities as defined by &enum dmx_demux_caps.
 * @may_do_mmap:	flag used to indicate if the device may do mmap.
 * @exit:		flag to indicate that the demux is being released.
 * @dvr_orig_fe:	pointer to &struct dmx_frontend.
 * @dvr_buffer:		embedded &struct dvb_ringbuffer for DVB output.
 * @dvr_vb2_ctx:	control struct for VB2 handler
 * @mutex:		protects the usage of this structure.
 * @lock:		protects access to &dmxdev->filter->data.
 */

Annotation

Implementation Notes