linux/drivers/media/dvb-core/dvb_demux.h

/*
 * dvb_demux.h: DVB kernel demux API
 *
 * Copyright (C) 2000-2001 Marcus Metzler & Ralph Metzler
 *                         for convergence integrated media GmbH
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation; either version 2.1
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 */

#ifndef _DVB_DEMUX_H_
#define _DVB_DEMUX_H_

#include <linux/time.h>
#include <linux/timer.h>
#include <linux/spinlock.h>
#include <linux/mutex.h>

#include "demux.h"

/**
 * enum dvb_dmx_filter_type - type of demux feed.
 *
 * @DMX_TYPE_TS:	feed is in TS mode.
 * @DMX_TYPE_SEC:	feed is in Section mode.
 */
enum dvb_dmx_filter_type {
	DMX_TYPE_TS,
	DMX_TYPE_SEC,
};

/**
 * enum dvb_dmx_state - state machine for a demux filter.
 *
 * @DMX_STATE_FREE:		indicates that the filter is freed.
 * @DMX_STATE_ALLOCATED:	indicates that the filter was allocated
 *				to be used.
 * @DMX_STATE_READY:		indicates that the filter is ready
 *				to be used.
 * @DMX_STATE_GO:		indicates that the filter is running.
 */
enum dvb_dmx_state {
	DMX_STATE_FREE,
	DMX_STATE_ALLOCATED,
	DMX_STATE_READY,
	DMX_STATE_GO,
};

#define DVB_DEMUX_MASK_MAX 18

#define MAX_PID 0x1fff

#define SPEED_PKTS_INTERVAL 50000

struct dvb_demux_filter {
	struct dmx_section_filter filter;
	u8 maskandmode[DMX_MAX_FILTER_SIZE];
	u8 maskandnotmode[DMX_MAX_FILTER_SIZE];
	bool doneq;

	struct dvb_demux_filter *next;
	struct dvb_demux_feed *feed;
	int index;
	enum dvb_dmx_state state;
	enum dvb_dmx_filter_type type;

	u16 hw_handle;
};

struct dvb_demux_feed {
	union {
		struct dmx_ts_feed ts;
		struct dmx_section_feed sec;
	} feed;

	union {
		dmx_ts_cb ts;
		dmx_section_cb sec;
	} cb;

	struct dvb_demux *demux;
	void *priv;
	enum dvb_dmx_filter_type type;
	enum dvb_dmx_state state;
	u16 pid;

	ktime_t timeout;
	struct dvb_demux_filter *filter;

	int ts_type;
	enum dmx_ts_pes pes_type;

	int cc;
	bool pusi_seen;		/* prevents feeding of garbage from previous section */

	u16 peslen;

	struct list_head list_head;
	unsigned int index;	/* a unique index for each feed (can be used as hardware pid filter index) */
};

struct dvb_demux {
	struct dmx_demux dmx;
	void *priv;
	int filternum;
	int feednum;
	int (*start_feed)(struct dvb_demux_feed *feed);
	int (*stop_feed)(struct dvb_demux_feed *feed);
	int (*write_to_decoder)(struct dvb_demux_feed *feed,
				 const u8 *buf, size_t len);
	u32 (*check_crc32)(struct dvb_demux_feed *feed,
			    const u8 *buf, size_t len);
	void (*memcopy)(struct dvb_demux_feed *feed, u8 *dst,
			 const u8 *src, size_t len);

	int users;
#define MAX_DVB_DEMUX_USERS 10
	struct dvb_demux_filter *filter;
	struct dvb_demux_feed *feed;

	struct list_head frontend_list;

	struct dvb_demux_feed *pesfilter[DMX_PES_OTHER];
	u16 pids[DMX_PES_OTHER];
	int playing;
	int recording;

#define DMX_MAX_PID 0x2000
	struct list_head feed_list;
	u8 tsbuf[204];
	int tsbufp;

	struct mutex mutex;
	spinlock_t lock;

	uint8_t *cnt_storage; /* for TS continuity check */

	ktime_t speed_last_time; /* for TS speed check */
	uint32_t speed_pkts_cnt; /* for TS speed check */
};

int dvb_dmx_init(struct dvb_demux *dvbdemux);
void dvb_dmx_release(struct dvb_demux *dvbdemux);
void dvb_dmx_swfilter_packets(struct dvb_demux *dvbdmx, const u8 *buf,
			      size_t count);
void dvb_dmx_swfilter(struct dvb_demux *demux, const u8 *buf, size_t count);
void dvb_dmx_swfilter_204(struct dvb_demux *demux, const u8 *buf,
			  size_t count);
void dvb_dmx_swfilter_raw(struct dvb_demux *demux, const u8 *buf,
			  size_t count);

#endif /* _DVB_DEMUX_H_ */