215 lines
5.9 KiB
C
215 lines
5.9 KiB
C
/*
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* dmxdev.h
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*
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* Copyright (C) 2000 Ralph Metzler & Marcus Metzler
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* for convergence integrated media GmbH
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public License
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* as published by the Free Software Foundation; either version 2.1
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#ifndef _DMXDEV_H_
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#define _DMXDEV_H_
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#include <linux/types.h>
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#include <linux/spinlock.h>
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#include <linux/kernel.h>
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#include <linux/time.h>
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#include <linux/timer.h>
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#include <linux/wait.h>
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#include <linux/fs.h>
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#include <linux/string.h>
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#include <linux/mutex.h>
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#include <linux/slab.h>
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#include <linux/dvb/dmx.h>
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#include <media/dvbdev.h>
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#include <media/demux.h>
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#include <media/dvb_ringbuffer.h>
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#include <media/dvb_vb2.h>
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/**
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* enum dmxdev_type - type of demux filter type.
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*
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* @DMXDEV_TYPE_NONE: no filter set.
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* @DMXDEV_TYPE_SEC: section filter.
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* @DMXDEV_TYPE_PES: Program Elementary Stream (PES) filter.
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*/
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enum dmxdev_type {
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DMXDEV_TYPE_NONE,
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DMXDEV_TYPE_SEC,
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DMXDEV_TYPE_PES,
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};
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/**
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* enum dmxdev_state - state machine for the dmxdev.
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*
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* @DMXDEV_STATE_FREE: indicates that the filter is freed.
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* @DMXDEV_STATE_ALLOCATED: indicates that the filter was allocated
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* to be used.
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* @DMXDEV_STATE_SET: indicates that the filter parameters are set.
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* @DMXDEV_STATE_GO: indicates that the filter is running.
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* @DMXDEV_STATE_DONE: indicates that a packet was already filtered
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* and the filter is now disabled.
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* Set only if %DMX_ONESHOT. See
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* &dmx_sct_filter_params.
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* @DMXDEV_STATE_TIMEDOUT: Indicates a timeout condition.
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*/
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enum dmxdev_state {
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DMXDEV_STATE_FREE,
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DMXDEV_STATE_ALLOCATED,
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DMXDEV_STATE_SET,
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DMXDEV_STATE_GO,
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DMXDEV_STATE_DONE,
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DMXDEV_STATE_TIMEDOUT
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};
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/**
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* struct dmxdev_feed - digital TV dmxdev feed
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*
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* @pid: Program ID to be filtered
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* @ts: pointer to &struct dmx_ts_feed
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* @next: &struct list_head pointing to the next feed.
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*/
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struct dmxdev_feed {
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u16 pid;
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struct dmx_ts_feed *ts;
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struct list_head next;
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};
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/**
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* struct dmxdev_filter - digital TV dmxdev filter
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*
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* @filter: a union describing a dmxdev filter.
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* Currently used only for section filters.
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* @filter.sec: a &struct dmx_section_filter pointer.
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* For section filter only.
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* @feed: a union describing a dmxdev feed.
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* Depending on the filter type, it can be either
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* @feed.ts or @feed.sec.
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* @feed.ts: a &struct list_head list.
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* For TS and PES feeds.
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* @feed.sec: a &struct dmx_section_feed pointer.
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* For section feed only.
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* @params: a union describing dmxdev filter parameters.
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* Depending on the filter type, it can be either
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* @params.sec or @params.pes.
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* @params.sec: a &struct dmx_sct_filter_params embedded struct.
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* For section filter only.
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* @params.pes: a &struct dmx_pes_filter_params embedded struct.
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* For PES filter only.
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* @type: type of the dmxdev filter, as defined by &enum dmxdev_type.
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* @state: state of the dmxdev filter, as defined by &enum dmxdev_state.
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* @dev: pointer to &struct dmxdev.
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* @buffer: an embedded &struct dvb_ringbuffer buffer.
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* @vb2_ctx: control struct for VB2 handler
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* @mutex: protects the access to &struct dmxdev_filter.
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* @timer: &struct timer_list embedded timer, used to check for
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* feed timeouts.
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* Only for section filter.
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* @todo: index for the @secheader.
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* Only for section filter.
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* @secheader: buffer cache to parse the section header.
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* Only for section filter.
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*/
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struct dmxdev_filter {
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union {
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struct dmx_section_filter *sec;
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} filter;
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union {
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/* list of TS and PES feeds (struct dmxdev_feed) */
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struct list_head ts;
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struct dmx_section_feed *sec;
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} feed;
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union {
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struct dmx_sct_filter_params sec;
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struct dmx_pes_filter_params pes;
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} params;
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enum dmxdev_type type;
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enum dmxdev_state state;
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struct dmxdev *dev;
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struct dvb_ringbuffer buffer;
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struct dvb_vb2_ctx vb2_ctx;
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struct mutex mutex;
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/* only for sections */
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struct timer_list timer;
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int todo;
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u8 secheader[3];
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};
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/**
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* struct dmxdev - Describes a digital TV demux device.
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*
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* @dvbdev: pointer to &struct dvb_device associated with
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* the demux device node.
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* @dvr_dvbdev: pointer to &struct dvb_device associated with
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* the dvr device node.
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* @filter: pointer to &struct dmxdev_filter.
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* @demux: pointer to &struct dmx_demux.
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* @filternum: number of filters.
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* @capabilities: demux capabilities as defined by &enum dmx_demux_caps.
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* @may_do_mmap: flag used to indicate if the device may do mmap.
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* @exit: flag to indicate that the demux is being released.
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* @dvr_orig_fe: pointer to &struct dmx_frontend.
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* @dvr_buffer: embedded &struct dvb_ringbuffer for DVB output.
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* @dvr_vb2_ctx: control struct for VB2 handler
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* @mutex: protects the usage of this structure.
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* @lock: protects access to &dmxdev->filter->data.
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*/
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struct dmxdev {
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struct dvb_device *dvbdev;
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struct dvb_device *dvr_dvbdev;
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struct dmxdev_filter *filter;
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struct dmx_demux *demux;
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int filternum;
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int capabilities;
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unsigned int may_do_mmap:1;
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unsigned int exit:1;
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#define DMXDEV_CAP_DUPLEX 1
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struct dmx_frontend *dvr_orig_fe;
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struct dvb_ringbuffer dvr_buffer;
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#define DVR_BUFFER_SIZE (10*188*1024)
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struct dvb_vb2_ctx dvr_vb2_ctx;
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struct mutex mutex;
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spinlock_t lock;
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};
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/**
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* dvb_dmxdev_init - initializes a digital TV demux and registers both demux
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* and DVR devices.
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*
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* @dmxdev: pointer to &struct dmxdev.
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* @adap: pointer to &struct dvb_adapter.
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*/
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int dvb_dmxdev_init(struct dmxdev *dmxdev, struct dvb_adapter *adap);
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/**
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* dvb_dmxdev_release - releases a digital TV demux and unregisters it.
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*
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* @dmxdev: pointer to &struct dmxdev.
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*/
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void dvb_dmxdev_release(struct dmxdev *dmxdev);
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#endif /* _DMXDEV_H_ */
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