Linux ip-172-26-7-228 5.4.0-1103-aws #111~18.04.1-Ubuntu SMP Tue May 23 20:04:10 UTC 2023 x86_64
Your IP : 18.117.170.80
/*
* dmxdev.h
*
* Copyright (C) 2000 Ralph Metzler & Marcus 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 _DMXDEV_H_
#define _DMXDEV_H_
#include <linux/types.h>
#include <linux/spinlock.h>
#include <linux/kernel.h>
#include <linux/time.h>
#include <linux/timer.h>
#include <linux/wait.h>
#include <linux/fs.h>
#include <linux/string.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/dvb/dmx.h>
#include <media/dvbdev.h>
#include <media/demux.h>
#include <media/dvb_ringbuffer.h>
#include <media/dvb_vb2.h>
/**
* enum dmxdev_type - type of demux filter type.
*
* @DMXDEV_TYPE_NONE: no filter set.
* @DMXDEV_TYPE_SEC: section filter.
* @DMXDEV_TYPE_PES: Program Elementary Stream (PES) filter.
*/
enum dmxdev_type {
DMXDEV_TYPE_NONE,
DMXDEV_TYPE_SEC,
DMXDEV_TYPE_PES,
};
/**
* enum dmxdev_state - state machine for the dmxdev.
*
* @DMXDEV_STATE_FREE: indicates that the filter is freed.
* @DMXDEV_STATE_ALLOCATED: indicates that the filter was allocated
* to be used.
* @DMXDEV_STATE_SET: indicates that the filter parameters are set.
* @DMXDEV_STATE_GO: indicates that the filter is running.
* @DMXDEV_STATE_DONE: indicates that a packet was already filtered
* and the filter is now disabled.
* Set only if %DMX_ONESHOT. See
* &dmx_sct_filter_params.
* @DMXDEV_STATE_TIMEDOUT: Indicates a timeout condition.
*/
enum dmxdev_state {
DMXDEV_STATE_FREE,
DMXDEV_STATE_ALLOCATED,
DMXDEV_STATE_SET,
DMXDEV_STATE_GO,
DMXDEV_STATE_DONE,
DMXDEV_STATE_TIMEDOUT
};
/**
* struct dmxdev_feed - digital TV dmxdev feed
*
* @pid: Program ID to be filtered
* @ts: pointer to &struct dmx_ts_feed
* @next: &struct list_head pointing to the next feed.
*/
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.
*/
struct dmxdev {
struct dvb_device *dvbdev;
struct dvb_device *dvr_dvbdev;
struct dmxdev_filter *filter;
struct dmx_demux *demux;
int filternum;
int capabilities;
unsigned int may_do_mmap:1;
unsigned int exit:1;
#define DMXDEV_CAP_DUPLEX 1
struct dmx_frontend *dvr_orig_fe;
struct dvb_ringbuffer dvr_buffer;
#define DVR_BUFFER_SIZE (10*188*1024)
struct dvb_vb2_ctx dvr_vb2_ctx;
struct mutex mutex;
spinlock_t lock;
};
/**
* dvb_dmxdev_init - initializes a digital TV demux and registers both demux
* and DVR devices.
*
* @dmxdev: pointer to &struct dmxdev.
* @adap: pointer to &struct dvb_adapter.
*/
int dvb_dmxdev_init(struct dmxdev *dmxdev, struct dvb_adapter *adap);
/**
* dvb_dmxdev_release - releases a digital TV demux and unregisters it.
*
* @dmxdev: pointer to &struct dmxdev.
*/
void dvb_dmxdev_release(struct dmxdev *dmxdev);
#endif /* _DMXDEV_H_ */
|