drivers/media/dvb-core/dmxdev.h

   1 /*
   2  * dmxdev.h
   3  *
   4  * Copyright (C) 2000 Ralph Metzler & Marcus Metzler
   5  *                    for convergence integrated media GmbH
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public License
   9  * as published by the Free Software Foundation; either version 2.1
  10  * of the License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  */
  18
  19 #ifndef _DMXDEV_H_
  20 #define _DMXDEV_H_
  21
  22 #include <linux/types.h>
  23 #include <linux/spinlock.h>
  24 #include <linux/kernel.h>
  25 #include <linux/time.h>
  26 #include <linux/timer.h>
  27 #include <linux/wait.h>
  28 #include <linux/fs.h>
  29 #include <linux/string.h>
  30 #include <linux/mutex.h>
  31 #include <linux/slab.h>
  32
  33 #include <linux/dvb/dmx.h>
  34
  35 #include "dvbdev.h"
  36 #include "demux.h"
  37 #include "dvb_ringbuffer.h"
  38
  39 /**
  40  * enum dmxdev_type - type of demux filter type.
  41  *
  42  * @DMXDEV_TYPE_NONE:   no filter set.
  43  * @DMXDEV_TYPE_SEC:    section filter.
  44  * @DMXDEV_TYPE_PES:    Program Elementary Stream (PES) filter.
  45  */
  46 enum dmxdev_type {
  47         DMXDEV_TYPE_NONE,
  48         DMXDEV_TYPE_SEC,
  49         DMXDEV_TYPE_PES,
  50 };
  51
  52 /**
  53  * enum dmxdev_state - state machine for the dmxdev.
  54  *
  55  * @DMXDEV_STATE_FREE:          indicates that the filter is freed.
  56  * @DMXDEV_STATE_ALLOCATED:     indicates that the filter was allocated
  57  *                              to be used.
  58  * @DMXDEV_STATE_SET:           indicates that the filter parameters are set.
  59  * @DMXDEV_STATE_GO:            indicates that the filter is running.
  60  * @DMXDEV_STATE_DONE:          indicates that a packet was already filtered
  61  *                              and the filter is now disabled.
  62  *                              Set only if %DMX_ONESHOT. See
  63  *                              &dmx_sct_filter_params.
  64  * @DMXDEV_STATE_TIMEDOUT:      Indicates a timeout condition.
  65  */
  66 enum dmxdev_state {
  67         DMXDEV_STATE_FREE,
  68         DMXDEV_STATE_ALLOCATED,
  69         DMXDEV_STATE_SET,
  70         DMXDEV_STATE_GO,
  71         DMXDEV_STATE_DONE,
  72         DMXDEV_STATE_TIMEDOUT
  73 };
  74
  75 /**
  76  * struct dmxdev_feed - digital TV dmxdev feed
  77  *
  78  * @pid:        Program ID to be filtered
  79  * @ts:         pointer to &struct dmx_ts_feed
  80  * @next:       &struct list_head pointing to the next feed.
  81  */
  82
  83 struct dmxdev_feed {
  84         u16 pid;
  85         struct dmx_ts_feed *ts;
  86         struct list_head next;
  87 };
  88
  89 /**
  90  * struct dmxdev_filter - digital TV dmxdev filter
  91  *
  92  * @filter:     a dmxdev filter. Currently used only for section filter:
  93  *              if the filter is Section, it contains a
  94  *              &struct dmx_section_filter @sec pointer.
  95  * @feed:       a dmxdev feed. Depending on the feed type, it can be:
  96  *              for TS feed: a &struct list_head @ts list of TS and PES
  97  *              feeds;
  98  *              for section feed: a &struct dmx_section_feed @sec pointer.
  99  * @params:     dmxdev filter parameters. Depending on the feed type, it
 100  *              can be:
 101  *              for section filter: a &struct dmx_sct_filter_params @sec
 102  *              embedded struct;
 103  *              for a TS filter: a &struct dmx_pes_filter_params @pes
 104  *              embedded struct.
 105  * @type:       type of the dmxdev filter, as defined by &enum dmxdev_type.
 106  * @state:      state of the dmxdev filter, as defined by &enum dmxdev_state.
 107  * @dev:        pointer to &struct dmxdev.
 108  * @buffer:     an embedded &struct dvb_ringbuffer buffer.
 109  * @mutex:      protects the access to &struct dmxdev_filter.
 110  * @timer:      &struct timer_list embedded timer, used to check for
 111  *              feed timeouts.
 112  *              Only for section filter.
 113  * @todo:       index for the @secheader.
 114  *              Only for section filter.
 115  * @secheader:  buffer cache to parse the section header.
 116  *              Only for section filter.
 117  */
 118 struct dmxdev_filter {
 119         union {
 120                 struct dmx_section_filter *sec;
 121         } filter;
 122
 123         union {
 124                 /* list of TS and PES feeds (struct dmxdev_feed) */
 125                 struct list_head ts;
 126                 struct dmx_section_feed *sec;
 127         } feed;
 128
 129         union {
 130                 struct dmx_sct_filter_params sec;
 131                 struct dmx_pes_filter_params pes;
 132         } params;
 133
 134         enum dmxdev_type type;
 135         enum dmxdev_state state;
 136         struct dmxdev *dev;
 137         struct dvb_ringbuffer buffer;
 138
 139         struct mutex mutex;
 140
 141         /* only for sections */
 142         struct timer_list timer;
 143         int todo;
 144         u8 secheader[3];
 145 };
 146
 147 /**
 148  * struct dmxdev - Describes a digital TV demux device.
 149  *
 150  * @dvbdev:             pointer to &struct dvb_device associated with
 151  *                      the demux device node.
 152  * @dvr_dvbdev:         pointer to &struct dvb_device associated with
 153  *                      the dvr device node.
 154  * @filter:             pointer to &struct dmxdev_filter.
 155  * @demux:              pointer to &struct dmx_demux.
 156  * @filternum:          number of filters.
 157  * @capabilities:       demux capabilities as defined by &enum dmx_demux_caps.
 158  * @exit:               flag to indicate that the demux is being released.
 159  * @dvr_orig_fe:        pointer to &struct dmx_frontend.
 160  * @dvr_buffer:         embedded &struct dvb_ringbuffer for DVB output.
 161  * @mutex:              protects the usage of this structure.
 162  * @lock:               protects access to &dmxdev->filter->data.
 163  */
 164 struct dmxdev {
 165         struct dvb_device *dvbdev;
 166         struct dvb_device *dvr_dvbdev;
 167
 168         struct dmxdev_filter *filter;
 169         struct dmx_demux *demux;
 170
 171         int filternum;
 172         int capabilities;
 173
 174         unsigned int exit:1;
 175 #define DMXDEV_CAP_DUPLEX 1
 176         struct dmx_frontend *dvr_orig_fe;
 177
 178         struct dvb_ringbuffer dvr_buffer;
 179 #define DVR_BUFFER_SIZE (10*188*1024)
 180
 181         struct mutex mutex;
 182         spinlock_t lock;
 183 };
 184
 185 /**
 186  * dvb_dmxdev_init - initializes a digital TV demux and registers both demux
 187  *      and DVR devices.
 188  *
 189  * @dmxdev: pointer to &struct dmxdev.
 190  * @adap: pointer to &struct dvb_adapter.
 191  */
 192 int dvb_dmxdev_init(struct dmxdev *dmxdev, struct dvb_adapter *adap);
 193
 194 /**
 195  * dvb_dmxdev_release - releases a digital TV demux and unregisters it.
 196  *
 197  * @dmxdev: pointer to &struct dmxdev.
 198  */
 199 void dvb_dmxdev_release(struct dmxdev *dmxdev);
 200
 201 #endif /* _DMXDEV_H_ */