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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/time.h>
25#include <linux/timer.h>
26#include <linux/wait.h>
27#include <linux/fs.h>
28#include <linux/string.h>
29#include <linux/mutex.h>
30#include <linux/slab.h>
31
32#include <linux/dvb/dmx.h>
33
34#include <media/dvbdev.h>
35#include <media/demux.h>
36#include <media/dvb_ringbuffer.h>
37#include <media/dvb_vb2.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 */
46enum 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 */
66enum 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
83struct 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 union describing a dmxdev filter.
93 * Currently used only for section filters.
94 * @filter.sec: a &struct dmx_section_filter pointer.
95 * For section filter only.
96 * @feed: a union describing a dmxdev feed.
97 * Depending on the filter type, it can be either
98 * @feed.ts or @feed.sec.
99 * @feed.ts: a &struct list_head list.
100 * For TS and PES feeds.
101 * @feed.sec: a &struct dmx_section_feed pointer.
102 * For section feed only.
103 * @params: a union describing dmxdev filter parameters.
104 * Depending on the filter type, it can be either
105 * @params.sec or @params.pes.
106 * @params.sec: a &struct dmx_sct_filter_params embedded struct.
107 * For section filter only.
108 * @params.pes: a &struct dmx_pes_filter_params embedded struct.
109 * For PES filter only.
110 * @type: type of the dmxdev filter, as defined by &enum dmxdev_type.
111 * @state: state of the dmxdev filter, as defined by &enum dmxdev_state.
112 * @dev: pointer to &struct dmxdev.
113 * @buffer: an embedded &struct dvb_ringbuffer buffer.
114 * @vb2_ctx: control struct for VB2 handler
115 * @mutex: protects the access to &struct dmxdev_filter.
116 * @timer: &struct timer_list embedded timer, used to check for
117 * feed timeouts.
118 * Only for section filter.
119 * @todo: index for the @secheader.
120 * Only for section filter.
121 * @secheader: buffer cache to parse the section header.
122 * Only for section filter.
123 */
124struct dmxdev_filter {
125 union {
126 struct dmx_section_filter *sec;
127 } filter;
128
129 union {
130 /* list of TS and PES feeds (struct dmxdev_feed) */
131 struct list_head ts;
132 struct dmx_section_feed *sec;
133 } feed;
134
135 union {
136 struct dmx_sct_filter_params sec;
137 struct dmx_pes_filter_params pes;
138 } params;
139
140 enum dmxdev_type type;
141 enum dmxdev_state state;
142 struct dmxdev *dev;
143 struct dvb_ringbuffer buffer;
144 struct dvb_vb2_ctx vb2_ctx;
145
146 struct mutex mutex;
147
148 /* only for sections */
149 struct timer_list timer;
150 int todo;
151 u8 secheader[3];
152};
153
154/**
155 * struct dmxdev - Describes a digital TV demux device.
156 *
157 * @dvbdev: pointer to &struct dvb_device associated with
158 * the demux device node.
159 * @dvr_dvbdev: pointer to &struct dvb_device associated with
160 * the dvr device node.
161 * @filter: pointer to &struct dmxdev_filter.
162 * @demux: pointer to &struct dmx_demux.
163 * @filternum: number of filters.
164 * @capabilities: demux capabilities as defined by &enum dmx_demux_caps.
165 * @may_do_mmap: flag used to indicate if the device may do mmap.
166 * @exit: flag to indicate that the demux is being released.
167 * @dvr_orig_fe: pointer to &struct dmx_frontend.
168 * @dvr_buffer: embedded &struct dvb_ringbuffer for DVB output.
169 * @dvr_vb2_ctx: control struct for VB2 handler
170 * @mutex: protects the usage of this structure.
171 * @lock: protects access to &dmxdev->filter->data.
172 */
173struct dmxdev {
174 struct dvb_device *dvbdev;
175 struct dvb_device *dvr_dvbdev;
176
177 struct dmxdev_filter *filter;
178 struct dmx_demux *demux;
179
180 int filternum;
181 int capabilities;
182
183 unsigned int may_do_mmap:1;
184 unsigned int exit:1;
185#define DMXDEV_CAP_DUPLEX 1
186 struct dmx_frontend *dvr_orig_fe;
187
188 struct dvb_ringbuffer dvr_buffer;
189#define DVR_BUFFER_SIZE (10*188*1024)
190
191 struct dvb_vb2_ctx dvr_vb2_ctx;
192
193 struct mutex mutex;
194 spinlock_t lock;
195};
196
197/**
198 * dvb_dmxdev_init - initializes a digital TV demux and registers both demux
199 * and DVR devices.
200 *
201 * @dmxdev: pointer to &struct dmxdev.
202 * @adap: pointer to &struct dvb_adapter.
203 */
204int dvb_dmxdev_init(struct dmxdev *dmxdev, struct dvb_adapter *adap);
205
206/**
207 * dvb_dmxdev_release - releases a digital TV demux and unregisters it.
208 *
209 * @dmxdev: pointer to &struct dmxdev.
210 */
211void dvb_dmxdev_release(struct dmxdev *dmxdev);
212
213#endif /* _DMXDEV_H_ */