[CIFS] Avoid extra large buffer allocation (and memcpy) in cifs_readpages
[sfrench/cifs-2.6.git] / drivers / media / dvb / dvb-core / demux.h
1 /*
2  * demux.h
3  *
4  * Copyright (c) 2002 Convergence GmbH
5  *
6  * based on code:
7  * Copyright (c) 2000 Nokia Research Center
8  *                    Tampere, FINLAND
9  *
10  * This program is free software; you can redistribute it and/or
11  * modify it under the terms of the GNU Lesser General Public License
12  * as published by the Free Software Foundation; either version 2.1
13  * of the License, or (at your option) any later version.
14  *
15  * This program is distributed in the hope that it will be useful,
16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18  * GNU General Public License for more details.
19  *
20  * You should have received a copy of the GNU Lesser General Public License
21  * along with this program; if not, write to the Free Software
22  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
23  *
24  */
25
26 #ifndef __DEMUX_H
27 #define __DEMUX_H
28
29 #include <linux/types.h>
30 #include <linux/errno.h>
31 #include <linux/list.h>
32 #include <linux/time.h>
33 #include <linux/dvb/dmx.h>
34
35 /*--------------------------------------------------------------------------*/
36 /* Common definitions */
37 /*--------------------------------------------------------------------------*/
38
39 /*
40  * DMX_MAX_FILTER_SIZE: Maximum length (in bytes) of a section/PES filter.
41  */
42
43 #ifndef DMX_MAX_FILTER_SIZE
44 #define DMX_MAX_FILTER_SIZE 18
45 #endif
46
47 /*
48  * DMX_MAX_SECFEED_SIZE: Maximum length (in bytes) of a private section feed filter.
49  */
50
51 #ifndef DMX_MAX_SECTION_SIZE
52 #define DMX_MAX_SECTION_SIZE 4096
53 #endif
54 #ifndef DMX_MAX_SECFEED_SIZE
55 #define DMX_MAX_SECFEED_SIZE (DMX_MAX_SECTION_SIZE + 188)
56 #endif
57
58
59 /*
60  * enum dmx_success: Success codes for the Demux Callback API.
61  */
62
63 enum dmx_success {
64   DMX_OK = 0, /* Received Ok */
65   DMX_LENGTH_ERROR, /* Incorrect length */
66   DMX_OVERRUN_ERROR, /* Receiver ring buffer overrun */
67   DMX_CRC_ERROR, /* Incorrect CRC */
68   DMX_FRAME_ERROR, /* Frame alignment error */
69   DMX_FIFO_ERROR, /* Receiver FIFO overrun */
70   DMX_MISSED_ERROR /* Receiver missed packet */
71 } ;
72
73 /*--------------------------------------------------------------------------*/
74 /* TS packet reception */
75 /*--------------------------------------------------------------------------*/
76
77 /* TS filter type for set() */
78
79 #define TS_PACKET       1   /* send TS packets (188 bytes) to callback (default) */
80 #define TS_PAYLOAD_ONLY 2   /* in case TS_PACKET is set, only send the TS
81                                payload (<=184 bytes per packet) to callback */
82 #define TS_DECODER      4   /* send stream to built-in decoder (if present) */
83
84 /* PES type for filters which write to built-in decoder */
85 /* these should be kept identical to the types in dmx.h */
86
87 enum dmx_ts_pes
88 {  /* also send packets to decoder (if it exists) */
89         DMX_TS_PES_AUDIO0,
90         DMX_TS_PES_VIDEO0,
91         DMX_TS_PES_TELETEXT0,
92         DMX_TS_PES_SUBTITLE0,
93         DMX_TS_PES_PCR0,
94
95         DMX_TS_PES_AUDIO1,
96         DMX_TS_PES_VIDEO1,
97         DMX_TS_PES_TELETEXT1,
98         DMX_TS_PES_SUBTITLE1,
99         DMX_TS_PES_PCR1,
100
101         DMX_TS_PES_AUDIO2,
102         DMX_TS_PES_VIDEO2,
103         DMX_TS_PES_TELETEXT2,
104         DMX_TS_PES_SUBTITLE2,
105         DMX_TS_PES_PCR2,
106
107         DMX_TS_PES_AUDIO3,
108         DMX_TS_PES_VIDEO3,
109         DMX_TS_PES_TELETEXT3,
110         DMX_TS_PES_SUBTITLE3,
111         DMX_TS_PES_PCR3,
112
113         DMX_TS_PES_OTHER
114 };
115
116 #define DMX_TS_PES_AUDIO    DMX_TS_PES_AUDIO0
117 #define DMX_TS_PES_VIDEO    DMX_TS_PES_VIDEO0
118 #define DMX_TS_PES_TELETEXT DMX_TS_PES_TELETEXT0
119 #define DMX_TS_PES_SUBTITLE DMX_TS_PES_SUBTITLE0
120 #define DMX_TS_PES_PCR      DMX_TS_PES_PCR0
121
122
123 struct dmx_ts_feed {
124         int is_filtering; /* Set to non-zero when filtering in progress */
125         struct dmx_demux *parent; /* Back-pointer */
126         void *priv; /* Pointer to private data of the API client */
127         int (*set) (struct dmx_ts_feed *feed,
128                     u16 pid,
129                     int type,
130                     enum dmx_ts_pes pes_type,
131                     size_t circular_buffer_size,
132                     struct timespec timeout);
133         int (*start_filtering) (struct dmx_ts_feed* feed);
134         int (*stop_filtering) (struct dmx_ts_feed* feed);
135 };
136
137 /*--------------------------------------------------------------------------*/
138 /* Section reception */
139 /*--------------------------------------------------------------------------*/
140
141 struct dmx_section_filter {
142         u8 filter_value [DMX_MAX_FILTER_SIZE];
143         u8 filter_mask [DMX_MAX_FILTER_SIZE];
144         u8 filter_mode [DMX_MAX_FILTER_SIZE];
145         struct dmx_section_feed* parent; /* Back-pointer */
146         void* priv; /* Pointer to private data of the API client */
147 };
148
149 struct dmx_section_feed {
150         int is_filtering; /* Set to non-zero when filtering in progress */
151         struct dmx_demux* parent; /* Back-pointer */
152         void* priv; /* Pointer to private data of the API client */
153
154         int check_crc;
155         u32 crc_val;
156
157         u8 *secbuf;
158         u8 secbuf_base[DMX_MAX_SECFEED_SIZE];
159         u16 secbufp, seclen, tsfeedp;
160
161         int (*set) (struct dmx_section_feed* feed,
162                     u16 pid,
163                     size_t circular_buffer_size,
164                     int check_crc);
165         int (*allocate_filter) (struct dmx_section_feed* feed,
166                                 struct dmx_section_filter** filter);
167         int (*release_filter) (struct dmx_section_feed* feed,
168                                struct dmx_section_filter* filter);
169         int (*start_filtering) (struct dmx_section_feed* feed);
170         int (*stop_filtering) (struct dmx_section_feed* feed);
171 };
172
173 /*--------------------------------------------------------------------------*/
174 /* Callback functions */
175 /*--------------------------------------------------------------------------*/
176
177 typedef int (*dmx_ts_cb) ( const u8 * buffer1,
178                            size_t buffer1_length,
179                            const u8 * buffer2,
180                            size_t buffer2_length,
181                            struct dmx_ts_feed* source,
182                            enum dmx_success success);
183
184 typedef int (*dmx_section_cb) ( const u8 * buffer1,
185                                 size_t buffer1_len,
186                                 const u8 * buffer2,
187                                 size_t buffer2_len,
188                                 struct dmx_section_filter * source,
189                                 enum dmx_success success);
190
191 /*--------------------------------------------------------------------------*/
192 /* DVB Front-End */
193 /*--------------------------------------------------------------------------*/
194
195 enum dmx_frontend_source {
196         DMX_MEMORY_FE,
197         DMX_FRONTEND_0,
198         DMX_FRONTEND_1,
199         DMX_FRONTEND_2,
200         DMX_FRONTEND_3,
201         DMX_STREAM_0,    /* external stream input, e.g. LVDS */
202         DMX_STREAM_1,
203         DMX_STREAM_2,
204         DMX_STREAM_3
205 };
206
207 struct dmx_frontend {
208         struct list_head connectivity_list; /* List of front-ends that can
209                                                be connected to a particular
210                                                demux */
211         enum dmx_frontend_source source;
212 };
213
214 /*--------------------------------------------------------------------------*/
215 /* MPEG-2 TS Demux */
216 /*--------------------------------------------------------------------------*/
217
218 /*
219  * Flags OR'ed in the capabilites field of struct dmx_demux.
220  */
221
222 #define DMX_TS_FILTERING                        1
223 #define DMX_PES_FILTERING                       2
224 #define DMX_SECTION_FILTERING                   4
225 #define DMX_MEMORY_BASED_FILTERING              8    /* write() available */
226 #define DMX_CRC_CHECKING                        16
227 #define DMX_TS_DESCRAMBLING                     32
228
229 /*
230  * Demux resource type identifier.
231 */
232
233 /*
234  * DMX_FE_ENTRY(): Casts elements in the list of registered
235  * front-ends from the generic type struct list_head
236  * to the type * struct dmx_frontend
237  *.
238 */
239
240 #define DMX_FE_ENTRY(list) list_entry(list, struct dmx_frontend, connectivity_list)
241
242 struct dmx_demux {
243         u32 capabilities;            /* Bitfield of capability flags */
244         struct dmx_frontend* frontend;    /* Front-end connected to the demux */
245         void* priv;                  /* Pointer to private data of the API client */
246         int (*open) (struct dmx_demux* demux);
247         int (*close) (struct dmx_demux* demux);
248         int (*write) (struct dmx_demux* demux, const char* buf, size_t count);
249         int (*allocate_ts_feed) (struct dmx_demux* demux,
250                                  struct dmx_ts_feed** feed,
251                                  dmx_ts_cb callback);
252         int (*release_ts_feed) (struct dmx_demux* demux,
253                                 struct dmx_ts_feed* feed);
254         int (*allocate_section_feed) (struct dmx_demux* demux,
255                                       struct dmx_section_feed** feed,
256                                       dmx_section_cb callback);
257         int (*release_section_feed) (struct dmx_demux* demux,
258                                      struct dmx_section_feed* feed);
259         int (*add_frontend) (struct dmx_demux* demux,
260                              struct dmx_frontend* frontend);
261         int (*remove_frontend) (struct dmx_demux* demux,
262                                 struct dmx_frontend* frontend);
263         struct list_head* (*get_frontends) (struct dmx_demux* demux);
264         int (*connect_frontend) (struct dmx_demux* demux,
265                                  struct dmx_frontend* frontend);
266         int (*disconnect_frontend) (struct dmx_demux* demux);
267
268         int (*get_pes_pids) (struct dmx_demux* demux, u16 *pids);
269
270         int (*get_caps) (struct dmx_demux* demux, struct dmx_caps *caps);
271
272         int (*set_source) (struct dmx_demux* demux, const dmx_source_t *src);
273
274         int (*get_stc) (struct dmx_demux* demux, unsigned int num,
275                         u64 *stc, unsigned int *base);
276 };
277
278 #endif /* #ifndef __DEMUX_H */