include/media/demux.h

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

File Facts

System
Linux kernel
Corpus path
include/media/demux.h
Extension
.h
Size
23237 bytes
Lines
601
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 dmx_ts_feed {
	int is_filtering;
	struct dmx_demux *parent;
	void *priv;
	int (*set)(struct dmx_ts_feed *feed,
		   u16 pid,
		   int type,
		   enum dmx_ts_pes pes_type,
		   ktime_t timeout);
	int (*start_filtering)(struct dmx_ts_feed *feed);
	int (*stop_filtering)(struct dmx_ts_feed *feed);
};

/*
 * Section reception
 */

/**
 * struct dmx_section_filter - Structure that describes a section filter
 *
 * @filter_value: Contains up to 16 bytes (128 bits) of the TS section header
 *		  that will be matched by the section filter
 * @filter_mask:  Contains a 16 bytes (128 bits) filter mask with the bits
 *		  specified by @filter_value that will be used on the filter
 *		  match logic.
 * @filter_mode:  Contains a 16 bytes (128 bits) filter mode.
 * @parent:	  Back-pointer to struct dmx_section_feed.
 * @priv:	  Pointer to private data of the API client.
 *
 *
 * The @filter_mask controls which bits of @filter_value are compared with
 * the section headers/payload. On a binary value of 1 in filter_mask, the
 * corresponding bits are compared. The filter only accepts sections that are
 * equal to filter_value in all the tested bit positions.
 */
struct dmx_section_filter {
	u8 filter_value[DMX_MAX_FILTER_SIZE];
	u8 filter_mask[DMX_MAX_FILTER_SIZE];
	u8 filter_mode[DMX_MAX_FILTER_SIZE];
	struct dmx_section_feed *parent;

	void *priv;
};

/**
 * struct dmx_section_feed - Structure that contains a section feed filter
 *
 * @is_filtering:	Set to non-zero when filtering in progress
 * @parent:		pointer to struct dmx_demux
 * @priv:		pointer to private data of the API client
 * @check_crc:		If non-zero, check the CRC values of filtered sections.
 * @set:		sets the section filter
 * @allocate_filter:	This function is used to allocate a section filter on
 *			the demux. It should only be called when no filtering
 *			is in progress on this section feed. If a filter cannot
 *			be allocated, the function fails with -ENOSPC.
 * @release_filter:	This function releases all the resources of a
 *			previously allocated section filter. The function
 *			should not be called while filtering is in progress
 *			on this section feed. After calling this function,
 *			the caller should not try to dereference the filter
 *			pointer.
 * @start_filtering:	starts section filtering
 * @stop_filtering:	stops section filtering
 *
 * A TS feed is typically mapped to a hardware PID filter on the demux chip.
 * Using this API, the client can set the filtering properties to start/stop
 * filtering TS packets on a particular TS feed.
 */
struct dmx_section_feed {
	int is_filtering;
	struct dmx_demux *parent;
	void *priv;

	int check_crc;

	/* private: Used internally at dvb_demux.c */
	u32 crc_val;

	u8 *secbuf;
	u8 secbuf_base[DMX_MAX_SECFEED_SIZE];
	u16 secbufp, seclen, tsfeedp;

	/* public: */
	int (*set)(struct dmx_section_feed *feed,
		   u16 pid,
		   int check_crc);
	int (*allocate_filter)(struct dmx_section_feed *feed,
			       struct dmx_section_filter **filter);
	int (*release_filter)(struct dmx_section_feed *feed,

Annotation

Implementation Notes