root/include/media/demux.h

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   1 /*
   2  * demux.h
   3  *
   4  * The Kernel Digital TV Demux kABI defines a driver-internal interface for
   5  * registering low-level, hardware specific driver to a hardware independent
   6  * demux layer.
   7  *
   8  * Copyright (c) 2002 Convergence GmbH
   9  *
  10  * based on code:
  11  * Copyright (c) 2000 Nokia Research Center
  12  *                    Tampere, FINLAND
  13  *
  14  * This program is free software; you can redistribute it and/or
  15  * modify it under the terms of the GNU Lesser General Public License
  16  * as published by the Free Software Foundation; either version 2.1
  17  * of the License, or (at your option) any later version.
  18  *
  19  * This program is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  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
  49  * filter.
  50  */
  51 
  52 #ifndef DMX_MAX_SECTION_SIZE
  53 #define DMX_MAX_SECTION_SIZE 4096
  54 #endif
  55 #ifndef DMX_MAX_SECFEED_SIZE
  56 #define DMX_MAX_SECFEED_SIZE (DMX_MAX_SECTION_SIZE + 188)
  57 #endif
  58 
  59 /*
  60  * TS packet reception
  61  */
  62 
  63 /**
  64  * enum ts_filter_type - filter type bitmap for dmx_ts_feed.set\(\)
  65  *
  66  * @TS_PACKET:          Send TS packets (188 bytes) to callback (default).
  67  * @TS_PAYLOAD_ONLY:    In case TS_PACKET is set, only send the TS payload
  68  *                      (<=184 bytes per packet) to callback
  69  * @TS_DECODER:         Send stream to built-in decoder (if present).
  70  * @TS_DEMUX:           In case TS_PACKET is set, send the TS to the demux
  71  *                      device, not to the dvr device
  72  */
  73 enum ts_filter_type {
  74         TS_PACKET = 1,
  75         TS_PAYLOAD_ONLY = 2,
  76         TS_DECODER = 4,
  77         TS_DEMUX = 8,
  78 };
  79 
  80 /**
  81  * struct dmx_ts_feed - Structure that contains a TS feed filter
  82  *
  83  * @is_filtering:       Set to non-zero when filtering in progress
  84  * @parent:             pointer to struct dmx_demux
  85  * @priv:               pointer to private data of the API client
  86  * @set:                sets the TS filter
  87  * @start_filtering:    starts TS filtering
  88  * @stop_filtering:     stops TS filtering
  89  *
  90  * A TS feed is typically mapped to a hardware PID filter on the demux chip.
  91  * Using this API, the client can set the filtering properties to start/stop
  92  * filtering TS packets on a particular TS feed.
  93  */
  94 struct dmx_ts_feed {
  95         int is_filtering;
  96         struct dmx_demux *parent;
  97         void *priv;
  98         int (*set)(struct dmx_ts_feed *feed,
  99                    u16 pid,
 100                    int type,
 101                    enum dmx_ts_pes pes_type,
 102                    ktime_t timeout);
 103         int (*start_filtering)(struct dmx_ts_feed *feed);
 104         int (*stop_filtering)(struct dmx_ts_feed *feed);
 105 };
 106 
 107 /*
 108  * Section reception
 109  */
 110 
 111 /**
 112  * struct dmx_section_filter - Structure that describes a section filter
 113  *
 114  * @filter_value: Contains up to 16 bytes (128 bits) of the TS section header
 115  *                that will be matched by the section filter
 116  * @filter_mask:  Contains a 16 bytes (128 bits) filter mask with the bits
 117  *                specified by @filter_value that will be used on the filter
 118  *                match logic.
 119  * @filter_mode:  Contains a 16 bytes (128 bits) filter mode.
 120  * @parent:       Back-pointer to struct dmx_section_feed.
 121  * @priv:         Pointer to private data of the API client.
 122  *
 123  *
 124  * The @filter_mask controls which bits of @filter_value are compared with
 125  * the section headers/payload. On a binary value of 1 in filter_mask, the
 126  * corresponding bits are compared. The filter only accepts sections that are
 127  * equal to filter_value in all the tested bit positions.
 128  */
 129 struct dmx_section_filter {
 130         u8 filter_value[DMX_MAX_FILTER_SIZE];
 131         u8 filter_mask[DMX_MAX_FILTER_SIZE];
 132         u8 filter_mode[DMX_MAX_FILTER_SIZE];
 133         struct dmx_section_feed *parent;
 134 
 135         void *priv;
 136 };
 137 
 138 /**
 139  * struct dmx_section_feed - Structure that contains a section feed filter
 140  *
 141  * @is_filtering:       Set to non-zero when filtering in progress
 142  * @parent:             pointer to struct dmx_demux
 143  * @priv:               pointer to private data of the API client
 144  * @check_crc:          If non-zero, check the CRC values of filtered sections.
 145  * @set:                sets the section filter
 146  * @allocate_filter:    This function is used to allocate a section filter on
 147  *                      the demux. It should only be called when no filtering
 148  *                      is in progress on this section feed. If a filter cannot
 149  *                      be allocated, the function fails with -ENOSPC.
 150  * @release_filter:     This function releases all the resources of a
 151  *                      previously allocated section filter. The function
 152  *                      should not be called while filtering is in progress
 153  *                      on this section feed. After calling this function,
 154  *                      the caller should not try to dereference the filter
 155  *                      pointer.
 156  * @start_filtering:    starts section filtering
 157  * @stop_filtering:     stops section filtering
 158  *
 159  * A TS feed is typically mapped to a hardware PID filter on the demux chip.
 160  * Using this API, the client can set the filtering properties to start/stop
 161  * filtering TS packets on a particular TS feed.
 162  */
 163 struct dmx_section_feed {
 164         int is_filtering;
 165         struct dmx_demux *parent;
 166         void *priv;
 167 
 168         int check_crc;
 169 
 170         /* private: Used internally at dvb_demux.c */
 171         u32 crc_val;
 172 
 173         u8 *secbuf;
 174         u8 secbuf_base[DMX_MAX_SECFEED_SIZE];
 175         u16 secbufp, seclen, tsfeedp;
 176 
 177         /* public: */
 178         int (*set)(struct dmx_section_feed *feed,
 179                    u16 pid,
 180                    int check_crc);
 181         int (*allocate_filter)(struct dmx_section_feed *feed,
 182                                struct dmx_section_filter **filter);
 183         int (*release_filter)(struct dmx_section_feed *feed,
 184                               struct dmx_section_filter *filter);
 185         int (*start_filtering)(struct dmx_section_feed *feed);
 186         int (*stop_filtering)(struct dmx_section_feed *feed);
 187 };
 188 
 189 /**
 190  * typedef dmx_ts_cb - DVB demux TS filter callback function prototype
 191  *
 192  * @buffer1:            Pointer to the start of the filtered TS packets.
 193  * @buffer1_length:     Length of the TS data in buffer1.
 194  * @buffer2:            Pointer to the tail of the filtered TS packets, or NULL.
 195  * @buffer2_length:     Length of the TS data in buffer2.
 196  * @source:             Indicates which TS feed is the source of the callback.
 197  * @buffer_flags:       Address where buffer flags are stored. Those are
 198  *                      used to report discontinuity users via DVB
 199  *                      memory mapped API, as defined by
 200  *                      &enum dmx_buffer_flags.
 201  *
 202  * This function callback prototype, provided by the client of the demux API,
 203  * is called from the demux code. The function is only called when filtering
 204  * on a TS feed has been enabled using the start_filtering\(\) function at
 205  * the &dmx_demux.
 206  * Any TS packets that match the filter settings are copied to a circular
 207  * buffer. The filtered TS packets are delivered to the client using this
 208  * callback function.
 209  * It is expected that the @buffer1 and @buffer2 callback parameters point to
 210  * addresses within the circular buffer, but other implementations are also
 211  * possible. Note that the called party should not try to free the memory
 212  * the @buffer1 and @buffer2 parameters point to.
 213  *
 214  * When this function is called, the @buffer1 parameter typically points to
 215  * the start of the first undelivered TS packet within a circular buffer.
 216  * The @buffer2 buffer parameter is normally NULL, except when the received
 217  * TS packets have crossed the last address of the circular buffer and
 218  * "wrapped" to the beginning of the buffer. In the latter case the @buffer1
 219  * parameter would contain an address within the circular buffer, while the
 220  * @buffer2 parameter would contain the first address of the circular buffer.
 221  * The number of bytes delivered with this function (i.e. @buffer1_length +
 222  * @buffer2_length) is usually equal to the value of callback_length parameter
 223  * given in the set() function, with one exception: if a timeout occurs before
 224  * receiving callback_length bytes of TS data, any undelivered packets are
 225  * immediately delivered to the client by calling this function. The timeout
 226  * duration is controlled by the set() function in the TS Feed API.
 227  *
 228  * If a TS packet is received with errors that could not be fixed by the
 229  * TS-level forward error correction (FEC), the Transport_error_indicator
 230  * flag of the TS packet header should be set. The TS packet should not be
 231  * discarded, as the error can possibly be corrected by a higher layer
 232  * protocol. If the called party is slow in processing the callback, it
 233  * is possible that the circular buffer eventually fills up. If this happens,
 234  * the demux driver should discard any TS packets received while the buffer
 235  * is full and return -EOVERFLOW.
 236  *
 237  * The type of data returned to the callback can be selected by the
 238  * &dmx_ts_feed.@set function. The type parameter decides if the raw
 239  * TS packet (TS_PACKET) or just the payload (TS_PACKET|TS_PAYLOAD_ONLY)
 240  * should be returned. If additionally the TS_DECODER bit is set the stream
 241  * will also be sent to the hardware MPEG decoder.
 242  *
 243  * Return:
 244  *
 245  * - 0, on success;
 246  *
 247  * - -EOVERFLOW, on buffer overflow.
 248  */
 249 typedef int (*dmx_ts_cb)(const u8 *buffer1,
 250                          size_t buffer1_length,
 251                          const u8 *buffer2,
 252                          size_t buffer2_length,
 253                          struct dmx_ts_feed *source,
 254                          u32 *buffer_flags);
 255 
 256 /**
 257  * typedef dmx_section_cb - DVB demux TS filter callback function prototype
 258  *
 259  * @buffer1:            Pointer to the start of the filtered section, e.g.
 260  *                      within the circular buffer of the demux driver.
 261  * @buffer1_len:        Length of the filtered section data in @buffer1,
 262  *                      including headers and CRC.
 263  * @buffer2:            Pointer to the tail of the filtered section data,
 264  *                      or NULL. Useful to handle the wrapping of a
 265  *                      circular buffer.
 266  * @buffer2_len:        Length of the filtered section data in @buffer2,
 267  *                      including headers and CRC.
 268  * @source:             Indicates which section feed is the source of the
 269  *                      callback.
 270  * @buffer_flags:       Address where buffer flags are stored. Those are
 271  *                      used to report discontinuity users via DVB
 272  *                      memory mapped API, as defined by
 273  *                      &enum dmx_buffer_flags.
 274  *
 275  * This function callback prototype, provided by the client of the demux API,
 276  * is called from the demux code. The function is only called when
 277  * filtering of sections has been enabled using the function
 278  * &dmx_ts_feed.@start_filtering. When the demux driver has received a
 279  * complete section that matches at least one section filter, the client
 280  * is notified via this callback function. Normally this function is called
 281  * for each received section; however, it is also possible to deliver
 282  * multiple sections with one callback, for example when the system load
 283  * is high. If an error occurs while receiving a section, this
 284  * function should be called with the corresponding error type set in the
 285  * success field, whether or not there is data to deliver. The Section Feed
 286  * implementation should maintain a circular buffer for received sections.
 287  * However, this is not necessary if the Section Feed API is implemented as
 288  * a client of the TS Feed API, because the TS Feed implementation then
 289  * buffers the received data. The size of the circular buffer can be
 290  * configured using the &dmx_ts_feed.@set function in the Section Feed API.
 291  * If there is no room in the circular buffer when a new section is received,
 292  * the section must be discarded. If this happens, the value of the success
 293  * parameter should be DMX_OVERRUN_ERROR on the next callback.
 294  */
 295 typedef int (*dmx_section_cb)(const u8 *buffer1,
 296                               size_t buffer1_len,
 297                               const u8 *buffer2,
 298                               size_t buffer2_len,
 299                               struct dmx_section_filter *source,
 300                               u32 *buffer_flags);
 301 
 302 /*
 303  * DVB Front-End
 304  */
 305 
 306 /**
 307  * enum dmx_frontend_source - Used to identify the type of frontend
 308  *
 309  * @DMX_MEMORY_FE:      The source of the demux is memory. It means that
 310  *                      the MPEG-TS to be filtered comes from userspace,
 311  *                      via write() syscall.
 312  *
 313  * @DMX_FRONTEND_0:     The source of the demux is a frontend connected
 314  *                      to the demux.
 315  */
 316 enum dmx_frontend_source {
 317         DMX_MEMORY_FE,
 318         DMX_FRONTEND_0,
 319 };
 320 
 321 /**
 322  * struct dmx_frontend - Structure that lists the frontends associated with
 323  *                       a demux
 324  *
 325  * @connectivity_list:  List of front-ends that can be connected to a
 326  *                      particular demux;
 327  * @source:             Type of the frontend.
 328  *
 329  * FIXME: this structure should likely be replaced soon by some
 330  *      media-controller based logic.
 331  */
 332 struct dmx_frontend {
 333         struct list_head connectivity_list;
 334         enum dmx_frontend_source source;
 335 };
 336 
 337 /*
 338  * MPEG-2 TS Demux
 339  */
 340 
 341 /**
 342  * enum dmx_demux_caps - MPEG-2 TS Demux capabilities bitmap
 343  *
 344  * @DMX_TS_FILTERING:           set if TS filtering is supported;
 345  * @DMX_SECTION_FILTERING:      set if section filtering is supported;
 346  * @DMX_MEMORY_BASED_FILTERING: set if write() available.
 347  *
 348  * Those flags are OR'ed in the &dmx_demux.capabilities field
 349  */
 350 enum dmx_demux_caps {
 351         DMX_TS_FILTERING = 1,
 352         DMX_SECTION_FILTERING = 4,
 353         DMX_MEMORY_BASED_FILTERING = 8,
 354 };
 355 
 356 /*
 357  * Demux resource type identifier.
 358  */
 359 
 360 /**
 361  * DMX_FE_ENTRY - Casts elements in the list of registered
 362  *                front-ends from the generic type struct list_head
 363  *                to the type * struct dmx_frontend
 364  *
 365  * @list: list of struct dmx_frontend
 366  */
 367 #define DMX_FE_ENTRY(list) \
 368         list_entry(list, struct dmx_frontend, connectivity_list)
 369 
 370 /**
 371  * struct dmx_demux - Structure that contains the demux capabilities and
 372  *                    callbacks.
 373  *
 374  * @capabilities: Bitfield of capability flags.
 375  *
 376  * @frontend: Front-end connected to the demux
 377  *
 378  * @priv: Pointer to private data of the API client
 379  *
 380  * @open: This function reserves the demux for use by the caller and, if
 381  *      necessary, initializes the demux. When the demux is no longer needed,
 382  *      the function @close should be called. It should be possible for
 383  *      multiple clients to access the demux at the same time. Thus, the
 384  *      function implementation should increment the demux usage count when
 385  *      @open is called and decrement it when @close is called.
 386  *      The @demux function parameter contains a pointer to the demux API and
 387  *      instance data.
 388  *      It returns:
 389  *      0 on success;
 390  *      -EUSERS, if maximum usage count was reached;
 391  *      -EINVAL, on bad parameter.
 392  *
 393  * @close: This function reserves the demux for use by the caller and, if
 394  *      necessary, initializes the demux. When the demux is no longer needed,
 395  *      the function @close should be called. It should be possible for
 396  *      multiple clients to access the demux at the same time. Thus, the
 397  *      function implementation should increment the demux usage count when
 398  *      @open is called and decrement it when @close is called.
 399  *      The @demux function parameter contains a pointer to the demux API and
 400  *      instance data.
 401  *      It returns:
 402  *      0 on success;
 403  *      -ENODEV, if demux was not in use (e. g. no users);
 404  *      -EINVAL, on bad parameter.
 405  *
 406  * @write: This function provides the demux driver with a memory buffer
 407  *      containing TS packets. Instead of receiving TS packets from the DVB
 408  *      front-end, the demux driver software will read packets from memory.
 409  *      Any clients of this demux with active TS, PES or Section filters will
 410  *      receive filtered data via the Demux callback API (see 0). The function
 411  *      returns when all the data in the buffer has been consumed by the demux.
 412  *      Demux hardware typically cannot read TS from memory. If this is the
 413  *      case, memory-based filtering has to be implemented entirely in software.
 414  *      The @demux function parameter contains a pointer to the demux API and
 415  *      instance data.
 416  *      The @buf function parameter contains a pointer to the TS data in
 417  *      kernel-space memory.
 418  *      The @count function parameter contains the length of the TS data.
 419  *      It returns:
 420  *      0 on success;
 421  *      -ERESTARTSYS, if mutex lock was interrupted;
 422  *      -EINTR, if a signal handling is pending;
 423  *      -ENODEV, if demux was removed;
 424  *      -EINVAL, on bad parameter.
 425  *
 426  * @allocate_ts_feed: Allocates a new TS feed, which is used to filter the TS
 427  *      packets carrying a certain PID. The TS feed normally corresponds to a
 428  *      hardware PID filter on the demux chip.
 429  *      The @demux function parameter contains a pointer to the demux API and
 430  *      instance data.
 431  *      The @feed function parameter contains a pointer to the TS feed API and
 432  *      instance data.
 433  *      The @callback function parameter contains a pointer to the callback
 434  *      function for passing received TS packet.
 435  *      It returns:
 436  *      0 on success;
 437  *      -ERESTARTSYS, if mutex lock was interrupted;
 438  *      -EBUSY, if no more TS feeds is available;
 439  *      -EINVAL, on bad parameter.
 440  *
 441  * @release_ts_feed: Releases the resources allocated with @allocate_ts_feed.
 442  *      Any filtering in progress on the TS feed should be stopped before
 443  *      calling this function.
 444  *      The @demux function parameter contains a pointer to the demux API and
 445  *      instance data.
 446  *      The @feed function parameter contains a pointer to the TS feed API and
 447  *      instance data.
 448  *      It returns:
 449  *      0 on success;
 450  *      -EINVAL on bad parameter.
 451  *
 452  * @allocate_section_feed: Allocates a new section feed, i.e. a demux resource
 453  *      for filtering and receiving sections. On platforms with hardware
 454  *      support for section filtering, a section feed is directly mapped to
 455  *      the demux HW. On other platforms, TS packets are first PID filtered in
 456  *      hardware and a hardware section filter then emulated in software. The
 457  *      caller obtains an API pointer of type dmx_section_feed_t as an out
 458  *      parameter. Using this API the caller can set filtering parameters and
 459  *      start receiving sections.
 460  *      The @demux function parameter contains a pointer to the demux API and
 461  *      instance data.
 462  *      The @feed function parameter contains a pointer to the TS feed API and
 463  *      instance data.
 464  *      The @callback function parameter contains a pointer to the callback
 465  *      function for passing received TS packet.
 466  *      It returns:
 467  *      0 on success;
 468  *      -EBUSY, if no more TS feeds is available;
 469  *      -EINVAL, on bad parameter.
 470  *
 471  * @release_section_feed: Releases the resources allocated with
 472  *      @allocate_section_feed, including allocated filters. Any filtering in
 473  *      progress on the section feed should be stopped before calling this
 474  *      function.
 475  *      The @demux function parameter contains a pointer to the demux API and
 476  *      instance data.
 477  *      The @feed function parameter contains a pointer to the TS feed API and
 478  *      instance data.
 479  *      It returns:
 480  *      0 on success;
 481  *      -EINVAL, on bad parameter.
 482  *
 483  * @add_frontend: Registers a connectivity between a demux and a front-end,
 484  *      i.e., indicates that the demux can be connected via a call to
 485  *      @connect_frontend to use the given front-end as a TS source. The
 486  *      client of this function has to allocate dynamic or static memory for
 487  *      the frontend structure and initialize its fields before calling this
 488  *      function. This function is normally called during the driver
 489  *      initialization. The caller must not free the memory of the frontend
 490  *      struct before successfully calling @remove_frontend.
 491  *      The @demux function parameter contains a pointer to the demux API and
 492  *      instance data.
 493  *      The @frontend function parameter contains a pointer to the front-end
 494  *      instance data.
 495  *      It returns:
 496  *      0 on success;
 497  *      -EINVAL, on bad parameter.
 498  *
 499  * @remove_frontend: Indicates that the given front-end, registered by a call
 500  *      to @add_frontend, can no longer be connected as a TS source by this
 501  *      demux. The function should be called when a front-end driver or a demux
 502  *      driver is removed from the system. If the front-end is in use, the
 503  *      function fails with the return value of -EBUSY. After successfully
 504  *      calling this function, the caller can free the memory of the frontend
 505  *      struct if it was dynamically allocated before the @add_frontend
 506  *      operation.
 507  *      The @demux function parameter contains a pointer to the demux API and
 508  *      instance data.
 509  *      The @frontend function parameter contains a pointer to the front-end
 510  *      instance data.
 511  *      It returns:
 512  *      0 on success;
 513  *      -ENODEV, if the front-end was not found,
 514  *      -EINVAL, on bad parameter.
 515  *
 516  * @get_frontends: Provides the APIs of the front-ends that have been
 517  *      registered for this demux. Any of the front-ends obtained with this
 518  *      call can be used as a parameter for @connect_frontend. The include
 519  *      file demux.h contains the macro DMX_FE_ENTRY() for converting an
 520  *      element of the generic type struct &list_head * to the type
 521  *      struct &dmx_frontend *. The caller must not free the memory of any of
 522  *      the elements obtained via this function call.
 523  *      The @demux function parameter contains a pointer to the demux API and
 524  *      instance data.
 525  *      It returns a struct list_head pointer to the list of front-end
 526  *      interfaces, or NULL in the case of an empty list.
 527  *
 528  * @connect_frontend: Connects the TS output of the front-end to the input of
 529  *      the demux. A demux can only be connected to a front-end registered to
 530  *      the demux with the function @add_frontend. It may or may not be
 531  *      possible to connect multiple demuxes to the same front-end, depending
 532  *      on the capabilities of the HW platform. When not used, the front-end
 533  *      should be released by calling @disconnect_frontend.
 534  *      The @demux function parameter contains a pointer to the demux API and
 535  *      instance data.
 536  *      The @frontend function parameter contains a pointer to the front-end
 537  *      instance data.
 538  *      It returns:
 539  *      0 on success;
 540  *      -EINVAL, on bad parameter.
 541  *
 542  * @disconnect_frontend: Disconnects the demux and a front-end previously
 543  *      connected by a @connect_frontend call.
 544  *      The @demux function parameter contains a pointer to the demux API and
 545  *      instance data.
 546  *      It returns:
 547  *      0 on success;
 548  *      -EINVAL on bad parameter.
 549  *
 550  * @get_pes_pids: Get the PIDs for DMX_PES_AUDIO0, DMX_PES_VIDEO0,
 551  *      DMX_PES_TELETEXT0, DMX_PES_SUBTITLE0 and DMX_PES_PCR0.
 552  *      The @demux function parameter contains a pointer to the demux API and
 553  *      instance data.
 554  *      The @pids function parameter contains an array with five u16 elements
 555  *      where the PIDs will be stored.
 556  *      It returns:
 557  *      0 on success;
 558  *      -EINVAL on bad parameter.
 559  */
 560 struct dmx_demux {
 561         enum dmx_demux_caps capabilities;
 562         struct dmx_frontend *frontend;
 563         void *priv;
 564         int (*open)(struct dmx_demux *demux);
 565         int (*close)(struct dmx_demux *demux);
 566         int (*write)(struct dmx_demux *demux, const char __user *buf,
 567                      size_t count);
 568         int (*allocate_ts_feed)(struct dmx_demux *demux,
 569                                 struct dmx_ts_feed **feed,
 570                                 dmx_ts_cb callback);
 571         int (*release_ts_feed)(struct dmx_demux *demux,
 572                                struct dmx_ts_feed *feed);
 573         int (*allocate_section_feed)(struct dmx_demux *demux,
 574                                      struct dmx_section_feed **feed,
 575                                      dmx_section_cb callback);
 576         int (*release_section_feed)(struct dmx_demux *demux,
 577                                     struct dmx_section_feed *feed);
 578         int (*add_frontend)(struct dmx_demux *demux,
 579                             struct dmx_frontend *frontend);
 580         int (*remove_frontend)(struct dmx_demux *demux,
 581                                struct dmx_frontend *frontend);
 582         struct list_head *(*get_frontends)(struct dmx_demux *demux);
 583         int (*connect_frontend)(struct dmx_demux *demux,
 584                                 struct dmx_frontend *frontend);
 585         int (*disconnect_frontend)(struct dmx_demux *demux);
 586 
 587         int (*get_pes_pids)(struct dmx_demux *demux, u16 *pids);
 588 
 589         /* private: */
 590 
 591         /*
 592          * Only used at av7110, to read some data from firmware.
 593          * As this was never documented, we have no clue about what's
 594          * there, and its usage on other drivers aren't encouraged.
 595          */
 596         int (*get_stc)(struct dmx_demux *demux, unsigned int num,
 597                        u64 *stc, unsigned int *base);
 598 };
 599 
 600 #endif /* #ifndef __DEMUX_H */

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