include/media/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 <media/dvbdev.h>
  36 #include <media/demux.h>
  37 #include <media/dvb_ringbuffer.h>
  38 #include <media/dvb_vb2.h>
  39
  40 /**
  41  * enum dmxdev_type - type of demux filter type.
  42  *
  43  * @DMXDEV_TYPE_NONE:   no filter set.
  44  * @DMXDEV_TYPE_SEC:    section filter.
  45  * @DMXDEV_TYPE_PES:    Program Elementary Stream (PES) filter.
  46  */
  47 enum dmxdev_type {
  48         DMXDEV_TYPE_NONE,
  49         DMXDEV_TYPE_SEC,
  50         DMXDEV_TYPE_PES,
  51 };
  52
  53 /**
  54  * enum dmxdev_state - state machine for the dmxdev.
  55  *
  56  * @DMXDEV_STATE_FREE:          indicates that the filter is freed.
  57  * @DMXDEV_STATE_ALLOCATED:     indicates that the filter was allocated
  58  *                              to be used.
  59  * @DMXDEV_STATE_SET:           indicates that the filter parameters are set.
  60  * @DMXDEV_STATE_GO:            indicates that the filter is running.
  61  * @DMXDEV_STATE_DONE:          indicates that a packet was already filtered
  62  *                              and the filter is now disabled.
  63  *                              Set only if %DMX_ONESHOT. See
  64  *                              &dmx_sct_filter_params.
  65  * @DMXDEV_STATE_TIMEDOUT:      Indicates a timeout condition.
  66  */
  67 enum dmxdev_state {
  68         DMXDEV_STATE_FREE,
  69         DMXDEV_STATE_ALLOCATED,
  70         DMXDEV_STATE_SET,
  71         DMXDEV_STATE_GO,
  72         DMXDEV_STATE_DONE,
  73         DMXDEV_STATE_TIMEDOUT
  74 };
  75
  76 /**
  77  * struct dmxdev_feed - digital TV dmxdev feed
  78  *
  79  * @pid:        Program ID to be filtered
  80  * @ts:         pointer to &struct dmx_ts_feed
  81  * @next:       &struct list_head pointing to the next feed.
  82  */
  83
  84 struct dmxdev_feed {
  85         u16 pid;
  86         struct dmx_ts_feed *ts;
  87         struct list_head next;
  88 };
  89
  90 /**
  91  * struct dmxdev_filter - digital TV dmxdev filter
  92  *
  93  * @filter:     a union describing a dmxdev filter.
  94  *              Currently used only for section filters.
  95  * @filter.sec: a &struct dmx_section_filter pointer.
  96  *              For section filter only.
  97  * @feed:       a union describing a dmxdev feed.
  98  *              Depending on the filter type, it can be either
  99  *              @feed.ts or @feed.sec.
 100  * @feed.ts:    a &struct list_head list.
 101  *              For TS and PES feeds.
 102  * @feed.sec:   a &struct dmx_section_feed pointer.
 103  *              For section feed only.
 104  * @params:     a union describing dmxdev filter parameters.
 105  *              Depending on the filter type, it can be either
 106  *              @params.sec or @params.pes.
 107  * @params.sec: a &struct dmx_sct_filter_params embedded struct.
 108  *              For section filter only.
 109  * @params.pes: a &struct dmx_pes_filter_params embedded struct.
 110  *              For PES filter only.
 111  * @type:       type of the dmxdev filter, as defined by &enum dmxdev_type.
 112  * @state:      state of the dmxdev filter, as defined by &enum dmxdev_state.
 113  * @dev:        pointer to &struct dmxdev.
 114  * @buffer:     an embedded &struct dvb_ringbuffer buffer.
 115  * @vb2_ctx:    control struct for VB2 handler
 116  * @mutex:      protects the access to &struct dmxdev_filter.
 117  * @timer:      &struct timer_list embedded timer, used to check for
 118  *              feed timeouts.
 119  *              Only for section filter.
 120  * @todo:       index for the @secheader.
 121  *              Only for section filter.
 122  * @secheader:  buffer cache to parse the section header.
 123  *              Only for section filter.
 124  */
 125 struct dmxdev_filter {
 126         union {
 127                 struct dmx_section_filter *sec;
 128         } filter;
 129
 130         union {
 131                 /* list of TS and PES feeds (struct dmxdev_feed) */
 132                 struct list_head ts;
 133                 struct dmx_section_feed *sec;
 134         } feed;
 135
 136         union {
 137                 struct dmx_sct_filter_params sec;
 138                 struct dmx_pes_filter_params pes;
 139         } params;
 140
 141         enum dmxdev_type type;
 142         enum dmxdev_state state;
 143         struct dmxdev *dev;
 144         struct dvb_ringbuffer buffer;
 145         struct dvb_vb2_ctx vb2_ctx;
 146
 147         struct mutex mutex;
 148
 149         /* only for sections */
 150         struct timer_list timer;
 151         int todo;
 152         u8 secheader[3];
 153 };
 154
 155 /**
 156  * struct dmxdev - Describes a digital TV demux device.
 157  *
 158  * @dvbdev:             pointer to &struct dvb_device associated with
 159  *                      the demux device node.
 160  * @dvr_dvbdev:         pointer to &struct dvb_device associated with
 161  *                      the dvr device node.
 162  * @filter:             pointer to &struct dmxdev_filter.
 163  * @demux:              pointer to &struct dmx_demux.
 164  * @filternum:          number of filters.
 165  * @capabilities:       demux capabilities as defined by &enum dmx_demux_caps.
 166  * @may_do_mmap:        flag used to indicate if the device may do mmap.
 167  * @exit:               flag to indicate that the demux is being released.
 168  * @dvr_orig_fe:        pointer to &struct dmx_frontend.
 169  * @dvr_buffer:         embedded &struct dvb_ringbuffer for DVB output.
 170  * @dvr_vb2_ctx:        control struct for VB2 handler
 171  * @mutex:              protects the usage of this structure.
 172  * @lock:               protects access to &dmxdev->filter->data.
 173  */
 174 struct dmxdev {
 175         struct dvb_device *dvbdev;
 176         struct dvb_device *dvr_dvbdev;
 177
 178         struct dmxdev_filter *filter;
 179         struct dmx_demux *demux;
 180
 181         int filternum;
 182         int capabilities;
 183
 184         unsigned int may_do_mmap:1;
 185         unsigned int exit:1;
 186 #define DMXDEV_CAP_DUPLEX 1
 187         struct dmx_frontend *dvr_orig_fe;
 188
 189         struct dvb_ringbuffer dvr_buffer;
 190 #define DVR_BUFFER_SIZE (10*188*1024)
 191
 192         struct dvb_vb2_ctx dvr_vb2_ctx;
 193
 194         struct mutex mutex;
 195         spinlock_t lock;
 196 };
 197
 198 /**
 199  * dvb_dmxdev_init - initializes a digital TV demux and registers both demux
 200  *      and DVR devices.
 201  *
 202  * @dmxdev: pointer to &struct dmxdev.
 203  * @adap: pointer to &struct dvb_adapter.
 204  */
 205 int dvb_dmxdev_init(struct dmxdev *dmxdev, struct dvb_adapter *adap);
 206
 207 /**
 208  * dvb_dmxdev_release - releases a digital TV demux and unregisters it.
 209  *
 210  * @dmxdev: pointer to &struct dmxdev.
 211  */
 212 void dvb_dmxdev_release(struct dmxdev *dmxdev);
 213
 214 #endif /* _DMXDEV_H_ */