4 * Copyright (c) 2002 Convergence GmbH
7 * Copyright (c) 2000 Nokia Research Center
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.
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.
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.
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>
40 * DMX_MAX_FILTER_SIZE: Maximum length (in bytes) of a section/PES filter.
43 #ifndef DMX_MAX_FILTER_SIZE
44 #define DMX_MAX_FILTER_SIZE 18
48 * DMX_MAX_SECFEED_SIZE: Maximum length (in bytes) of a private section feed
52 #ifndef DMX_MAX_SECTION_SIZE
53 #define DMX_MAX_SECTION_SIZE 4096
55 #ifndef DMX_MAX_SECFEED_SIZE
56 #define DMX_MAX_SECFEED_SIZE (DMX_MAX_SECTION_SIZE + 188)
63 /* TS filter type for set() */
65 #define TS_PACKET 1 /*
66 * send TS packets (188 bytes) to callback
70 #define TS_PAYLOAD_ONLY 2 /*
71 * in case TS_PACKET is set, only send the TS
72 * payload (<=184 bytes per packet) to callback
75 #define TS_DECODER 4 /*
76 * send stream to built-in decoder (if present)
80 * in case TS_PACKET is set, send the TS to
81 * the demux device, not to the dvr device
85 * struct dmx_ts_feed - Structure that contains a TS feed filter
87 * @is_filtering: Set to non-zero when filtering in progress
88 * @parent: pointer to struct dmx_demux
89 * @priv: pointer to private data of the API client
90 * @set: sets the TS filter
91 * @start_filtering: starts TS filtering
92 * @stop_filtering: stops TS filtering
94 * A TS feed is typically mapped to a hardware PID filter on the demux chip.
95 * Using this API, the client can set the filtering properties to start/stop
96 * filtering TS packets on a particular TS feed.
100 struct dmx_demux *parent;
102 int (*set)(struct dmx_ts_feed *feed,
105 enum dmx_ts_pes pes_type,
106 size_t circular_buffer_size,
107 struct timespec timeout);
108 int (*start_filtering)(struct dmx_ts_feed *feed);
109 int (*stop_filtering)(struct dmx_ts_feed *feed);
117 * struct dmx_section_filter - Structure that describes a section filter
119 * @filter_value: Contains up to 16 bytes (128 bits) of the TS section header
120 * that will be matched by the section filter
121 * @filter_mask: Contains a 16 bytes (128 bits) filter mask with the bits
122 * specified by @filter_value that will be used on the filter
124 * @filter_mode: Contains a 16 bytes (128 bits) filter mode.
125 * @parent: Pointer to struct dmx_section_feed.
126 * @priv: Pointer to private data of the API client.
129 * The @filter_mask controls which bits of @filter_value are compared with
130 * the section headers/payload. On a binary value of 1 in filter_mask, the
131 * corresponding bits are compared. The filter only accepts sections that are
132 * equal to filter_value in all the tested bit positions.
134 struct dmx_section_filter {
135 u8 filter_value[DMX_MAX_FILTER_SIZE];
136 u8 filter_mask[DMX_MAX_FILTER_SIZE];
137 u8 filter_mode[DMX_MAX_FILTER_SIZE];
138 struct dmx_section_feed *parent; /* Back-pointer */
139 void *priv; /* Pointer to private data of the API client */
143 * struct dmx_section_feed - Structure that contains a section feed filter
145 * @is_filtering: Set to non-zero when filtering in progress
146 * @parent: pointer to struct dmx_demux
147 * @priv: pointer to private data of the API client
148 * @check_crc: If non-zero, check the CRC values of filtered sections.
149 * @set: sets the section filter
150 * @allocate_filter: This function is used to allocate a section filter on
151 * the demux. It should only be called when no filtering
152 * is in progress on this section feed. If a filter cannot
153 * be allocated, the function fails with -ENOSPC.
154 * @release_filter: This function releases all the resources of a
155 * previously allocated section filter. The function
156 * should not be called while filtering is in progress
157 * on this section feed. After calling this function,
158 * the caller should not try to dereference the filter
160 * @start_filtering: starts section filtering
161 * @stop_filtering: stops section filtering
163 * A TS feed is typically mapped to a hardware PID filter on the demux chip.
164 * Using this API, the client can set the filtering properties to start/stop
165 * filtering TS packets on a particular TS feed.
167 struct dmx_section_feed {
169 struct dmx_demux *parent;
174 /* private: Used internally at dvb_demux.c */
178 u8 secbuf_base[DMX_MAX_SECFEED_SIZE];
179 u16 secbufp, seclen, tsfeedp;
182 int (*set)(struct dmx_section_feed *feed,
184 size_t circular_buffer_size,
186 int (*allocate_filter)(struct dmx_section_feed *feed,
187 struct dmx_section_filter **filter);
188 int (*release_filter)(struct dmx_section_feed *feed,
189 struct dmx_section_filter *filter);
190 int (*start_filtering)(struct dmx_section_feed *feed);
191 int (*stop_filtering)(struct dmx_section_feed *feed);
198 typedef int (*dmx_ts_cb)(const u8 *buffer1,
199 size_t buffer1_length,
201 size_t buffer2_length,
202 struct dmx_ts_feed *source);
204 typedef int (*dmx_section_cb)(const u8 *buffer1,
208 struct dmx_section_filter *source);
210 /*--------------------------------------------------------------------------*/
212 /*--------------------------------------------------------------------------*/
215 * enum dmx_frontend_source - Used to identify the type of frontend
217 * @DMX_MEMORY_FE: The source of the demux is memory. It means that
218 * the MPEG-TS to be filtered comes from userspace,
219 * via write() syscall.
221 * @DMX_FRONTEND_0: The source of the demux is a frontend connected
224 enum dmx_frontend_source {
230 * struct dmx_frontend - Structure that lists the frontends associated with
233 * @connectivity_list: List of front-ends that can be connected to a
235 * @source: Type of the frontend.
237 * FIXME: this structure should likely be replaced soon by some
238 * media-controller based logic.
240 struct dmx_frontend {
241 struct list_head connectivity_list;
242 enum dmx_frontend_source source;
250 * Flags OR'ed in the capabilities field of struct dmx_demux.
253 #define DMX_TS_FILTERING 1
254 #define DMX_PES_FILTERING 2
255 #define DMX_SECTION_FILTERING 4
256 #define DMX_MEMORY_BASED_FILTERING 8 /* write() available */
257 #define DMX_CRC_CHECKING 16
258 #define DMX_TS_DESCRAMBLING 32
261 * Demux resource type identifier.
265 * DMX_FE_ENTRY(): Casts elements in the list of registered
266 * front-ends from the generic type struct list_head
267 * to the type * struct dmx_frontend
271 #define DMX_FE_ENTRY(list) \
272 list_entry(list, struct dmx_frontend, connectivity_list)
275 * struct dmx_demux - Structure that contains the demux capabilities and
278 * @capabilities: Bitfield of capability flags
280 * @frontend: Front-end connected to the demux
282 * @priv: Pointer to private data of the API client
284 * @open: This function reserves the demux for use by the caller and, if
285 * necessary, initializes the demux. When the demux is no longer needed,
286 * the function @close should be called. It should be possible for
287 * multiple clients to access the demux at the same time. Thus, the
288 * function implementation should increment the demux usage count when
289 * @open is called and decrement it when @close is called.
290 * The @demux function parameter contains a pointer to the demux API and
294 * -EUSERS, if maximum usage count was reached;
295 * -EINVAL, on bad parameter.
297 * @close: This function reserves the demux for use by the caller and, if
298 * necessary, initializes the demux. When the demux is no longer needed,
299 * the function @close should be called. It should be possible for
300 * multiple clients to access the demux at the same time. Thus, the
301 * function implementation should increment the demux usage count when
302 * @open is called and decrement it when @close is called.
303 * The @demux function parameter contains a pointer to the demux API and
307 * -ENODEV, if demux was not in use (e. g. no users);
308 * -EINVAL, on bad parameter.
310 * @write: This function provides the demux driver with a memory buffer
311 * containing TS packets. Instead of receiving TS packets from the DVB
312 * front-end, the demux driver software will read packets from memory.
313 * Any clients of this demux with active TS, PES or Section filters will
314 * receive filtered data via the Demux callback API (see 0). The function
315 * returns when all the data in the buffer has been consumed by the demux.
316 * Demux hardware typically cannot read TS from memory. If this is the
317 * case, memory-based filtering has to be implemented entirely in software.
318 * The @demux function parameter contains a pointer to the demux API and
320 * The @buf function parameter contains a pointer to the TS data in
321 * kernel-space memory.
322 * The @count function parameter contains the length of the TS data.
325 * -ERESTARTSYS, if mutex lock was interrupted;
326 * -EINTR, if a signal handling is pending;
327 * -ENODEV, if demux was removed;
328 * -EINVAL, on bad parameter.
330 * @allocate_ts_feed: Allocates a new TS feed, which is used to filter the TS
331 * packets carrying a certain PID. The TS feed normally corresponds to a
332 * hardware PID filter on the demux chip.
333 * The @demux function parameter contains a pointer to the demux API and
335 * The @feed function parameter contains a pointer to the TS feed API and
337 * The @callback function parameter contains a pointer to the callback
338 * function for passing received TS packet.
341 * -ERESTARTSYS, if mutex lock was interrupted;
342 * -EBUSY, if no more TS feeds is available;
343 * -EINVAL, on bad parameter.
345 * @release_ts_feed: Releases the resources allocated with @allocate_ts_feed.
346 * Any filtering in progress on the TS feed should be stopped before
347 * calling this function.
348 * The @demux function parameter contains a pointer to the demux API and
350 * The @feed function parameter contains a pointer to the TS feed API and
354 * -EINVAL on bad parameter.
356 * @allocate_section_feed: Allocates a new section feed, i.e. a demux resource
357 * for filtering and receiving sections. On platforms with hardware
358 * support for section filtering, a section feed is directly mapped to
359 * the demux HW. On other platforms, TS packets are first PID filtered in
360 * hardware and a hardware section filter then emulated in software. The
361 * caller obtains an API pointer of type dmx_section_feed_t as an out
362 * parameter. Using this API the caller can set filtering parameters and
363 * start receiving sections.
364 * The @demux function parameter contains a pointer to the demux API and
366 * The @feed function parameter contains a pointer to the TS feed API and
368 * The @callback function parameter contains a pointer to the callback
369 * function for passing received TS packet.
372 * -EBUSY, if no more TS feeds is available;
373 * -EINVAL, on bad parameter.
375 * @release_section_feed: Releases the resources allocated with
376 * @allocate_section_feed, including allocated filters. Any filtering in
377 * progress on the section feed should be stopped before calling this
379 * The @demux function parameter contains a pointer to the demux API and
381 * The @feed function parameter contains a pointer to the TS feed API and
385 * -EINVAL, on bad parameter.
387 * @add_frontend: Registers a connectivity between a demux and a front-end,
388 * i.e., indicates that the demux can be connected via a call to
389 * @connect_frontend to use the given front-end as a TS source. The
390 * client of this function has to allocate dynamic or static memory for
391 * the frontend structure and initialize its fields before calling this
392 * function. This function is normally called during the driver
393 * initialization. The caller must not free the memory of the frontend
394 * struct before successfully calling @remove_frontend.
395 * The @demux function parameter contains a pointer to the demux API and
397 * The @frontend function parameter contains a pointer to the front-end
401 * -EINVAL, on bad parameter.
403 * @remove_frontend: Indicates that the given front-end, registered by a call
404 * to @add_frontend, can no longer be connected as a TS source by this
405 * demux. The function should be called when a front-end driver or a demux
406 * driver is removed from the system. If the front-end is in use, the
407 * function fails with the return value of -EBUSY. After successfully
408 * calling this function, the caller can free the memory of the frontend
409 * struct if it was dynamically allocated before the @add_frontend
411 * The @demux function parameter contains a pointer to the demux API and
413 * The @frontend function parameter contains a pointer to the front-end
417 * -ENODEV, if the front-end was not found,
418 * -EINVAL, on bad parameter.
420 * @get_frontends: Provides the APIs of the front-ends that have been
421 * registered for this demux. Any of the front-ends obtained with this
422 * call can be used as a parameter for @connect_frontend. The include
423 * file demux.h contains the macro DMX_FE_ENTRY() for converting an
424 * element of the generic type struct &list_head * to the type
425 * struct &dmx_frontend *. The caller must not free the memory of any of
426 * the elements obtained via this function call.
427 * The @demux function parameter contains a pointer to the demux API and
429 * It returns a struct list_head pointer to the list of front-end
430 * interfaces, or NULL in the case of an empty list.
432 * @connect_frontend: Connects the TS output of the front-end to the input of
433 * the demux. A demux can only be connected to a front-end registered to
434 * the demux with the function @add_frontend. It may or may not be
435 * possible to connect multiple demuxes to the same front-end, depending
436 * on the capabilities of the HW platform. When not used, the front-end
437 * should be released by calling @disconnect_frontend.
438 * The @demux function parameter contains a pointer to the demux API and
440 * The @frontend function parameter contains a pointer to the front-end
444 * -EINVAL, on bad parameter.
446 * @disconnect_frontend: Disconnects the demux and a front-end previously
447 * connected by a @connect_frontend call.
448 * The @demux function parameter contains a pointer to the demux API and
452 * -EINVAL on bad parameter.
454 * @get_pes_pids: Get the PIDs for DMX_PES_AUDIO0, DMX_PES_VIDEO0,
455 * DMX_PES_TELETEXT0, DMX_PES_SUBTITLE0 and DMX_PES_PCR0.
456 * The @demux function parameter contains a pointer to the demux API and
458 * The @pids function parameter contains an array with five u16 elements
459 * where the PIDs will be stored.
462 * -EINVAL on bad parameter.
467 struct dmx_frontend *frontend;
469 int (*open)(struct dmx_demux *demux);
470 int (*close)(struct dmx_demux *demux);
471 int (*write)(struct dmx_demux *demux, const char __user *buf,
473 int (*allocate_ts_feed)(struct dmx_demux *demux,
474 struct dmx_ts_feed **feed,
476 int (*release_ts_feed)(struct dmx_demux *demux,
477 struct dmx_ts_feed *feed);
478 int (*allocate_section_feed)(struct dmx_demux *demux,
479 struct dmx_section_feed **feed,
480 dmx_section_cb callback);
481 int (*release_section_feed)(struct dmx_demux *demux,
482 struct dmx_section_feed *feed);
483 int (*add_frontend)(struct dmx_demux *demux,
484 struct dmx_frontend *frontend);
485 int (*remove_frontend)(struct dmx_demux *demux,
486 struct dmx_frontend *frontend);
487 struct list_head *(*get_frontends)(struct dmx_demux *demux);
488 int (*connect_frontend)(struct dmx_demux *demux,
489 struct dmx_frontend *frontend);
490 int (*disconnect_frontend)(struct dmx_demux *demux);
492 int (*get_pes_pids)(struct dmx_demux *demux, u16 *pids);
494 /* private: Not used upstream and never documented */
496 int (*get_caps)(struct dmx_demux *demux, struct dmx_caps *caps);
497 int (*set_source)(struct dmx_demux *demux, const dmx_source_t *src);
500 * private: Only used at av7110, to read some data from firmware.
501 * As this was never documented, we have no clue about what's
502 * there, and its usage on other drivers aren't encouraged.
504 int (*get_stc)(struct dmx_demux *demux, unsigned int num,
505 u64 *stc, unsigned int *base);
508 #endif /* #ifndef __DEMUX_H */