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
  34 /*--------------------------------------------------------------------------*/
  35 /* Common definitions */
  36 /*--------------------------------------------------------------------------*/
  37
  38 /*
  39  * DMX_MAX_FILTER_SIZE: Maximum length (in bytes) of a section/PES filter.
  40  */
  41
  42 #ifndef DMX_MAX_FILTER_SIZE
  43 #define DMX_MAX_FILTER_SIZE 18
  44 #endif
  45
  46 /*
  47  * DMX_MAX_SECFEED_SIZE: Maximum length (in bytes) of a private section feed filter.
  48  */
  49
  50 #ifndef DMX_MAX_SECFEED_SIZE
  51 #define DMX_MAX_SECFEED_SIZE 4096
  52 #endif
  53
  54
  55 /*
  56  * enum dmx_success: Success codes for the Demux Callback API.
  57  */
  58
  59 enum dmx_success {
  60   DMX_OK = 0, /* Received Ok */
  61   DMX_LENGTH_ERROR, /* Incorrect length */
  62   DMX_OVERRUN_ERROR, /* Receiver ring buffer overrun */
  63   DMX_CRC_ERROR, /* Incorrect CRC */
  64   DMX_FRAME_ERROR, /* Frame alignment error */
  65   DMX_FIFO_ERROR, /* Receiver FIFO overrun */
  66   DMX_MISSED_ERROR /* Receiver missed packet */
  67 } ;
  68
  69 /*--------------------------------------------------------------------------*/
  70 /* TS packet reception */
  71 /*--------------------------------------------------------------------------*/
  72
  73 /* TS filter type for set() */
  74
  75 #define TS_PACKET       1   /* send TS packets (188 bytes) to callback (default) */
  76 #define TS_PAYLOAD_ONLY 2   /* in case TS_PACKET is set, only send the TS
  77                                payload (<=184 bytes per packet) to callback */
  78 #define TS_DECODER      4   /* send stream to built-in decoder (if present) */
  79
  80 /* PES type for filters which write to built-in decoder */
  81 /* these should be kept identical to the types in dmx.h */
  82
  83 enum dmx_ts_pes
  84 {  /* also send packets to decoder (if it exists) */
  85         DMX_TS_PES_AUDIO0,
  86         DMX_TS_PES_VIDEO0,
  87         DMX_TS_PES_TELETEXT0,
  88         DMX_TS_PES_SUBTITLE0,
  89         DMX_TS_PES_PCR0,
  90
  91         DMX_TS_PES_AUDIO1,
  92         DMX_TS_PES_VIDEO1,
  93         DMX_TS_PES_TELETEXT1,
  94         DMX_TS_PES_SUBTITLE1,
  95         DMX_TS_PES_PCR1,
  96
  97         DMX_TS_PES_AUDIO2,
  98         DMX_TS_PES_VIDEO2,
  99         DMX_TS_PES_TELETEXT2,
 100         DMX_TS_PES_SUBTITLE2,
 101         DMX_TS_PES_PCR2,
 102
 103         DMX_TS_PES_AUDIO3,
 104         DMX_TS_PES_VIDEO3,
 105         DMX_TS_PES_TELETEXT3,
 106         DMX_TS_PES_SUBTITLE3,
 107         DMX_TS_PES_PCR3,
 108
 109         DMX_TS_PES_OTHER
 110 };
 111
 112 #define DMX_TS_PES_AUDIO    DMX_TS_PES_AUDIO0
 113 #define DMX_TS_PES_VIDEO    DMX_TS_PES_VIDEO0
 114 #define DMX_TS_PES_TELETEXT DMX_TS_PES_TELETEXT0
 115 #define DMX_TS_PES_SUBTITLE DMX_TS_PES_SUBTITLE0
 116 #define DMX_TS_PES_PCR      DMX_TS_PES_PCR0
 117
 118
 119 struct dmx_ts_feed {
 120         int is_filtering; /* Set to non-zero when filtering in progress */
 121         struct dmx_demux *parent; /* Back-pointer */
 122         void *priv; /* Pointer to private data of the API client */
 123         int (*set) (struct dmx_ts_feed *feed,
 124                     u16 pid,
 125                     int type,
 126                     enum dmx_ts_pes pes_type,
 127                     size_t callback_length,
 128                     size_t circular_buffer_size,
 129                     int descramble,
 130                     struct timespec timeout);
 131         int (*start_filtering) (struct dmx_ts_feed* feed);
 132         int (*stop_filtering) (struct dmx_ts_feed* feed);
 133 };
 134
 135 /*--------------------------------------------------------------------------*/
 136 /* Section reception */
 137 /*--------------------------------------------------------------------------*/
 138
 139 struct dmx_section_filter {
 140         u8 filter_value [DMX_MAX_FILTER_SIZE];
 141         u8 filter_mask [DMX_MAX_FILTER_SIZE];
 142         u8 filter_mode [DMX_MAX_FILTER_SIZE];
 143         struct dmx_section_feed* parent; /* Back-pointer */
 144         void* priv; /* Pointer to private data of the API client */
 145 };
 146
 147 struct dmx_section_feed {
 148         int is_filtering; /* Set to non-zero when filtering in progress */
 149         struct dmx_demux* parent; /* Back-pointer */
 150         void* priv; /* Pointer to private data of the API client */
 151
 152         int check_crc;
 153         u32 crc_val;
 154
 155         u8 *secbuf;
 156         u8 secbuf_base[DMX_MAX_SECFEED_SIZE];
 157         u16 secbufp, seclen, tsfeedp;
 158
 159         int (*set) (struct dmx_section_feed* feed,
 160                     u16 pid,
 161                     size_t circular_buffer_size,
 162                     int descramble,
 163                     int check_crc);
 164         int (*allocate_filter) (struct dmx_section_feed* feed,
 165                                 struct dmx_section_filter** filter);
 166         int (*release_filter) (struct dmx_section_feed* feed,
 167                                struct dmx_section_filter* filter);
 168         int (*start_filtering) (struct dmx_section_feed* feed);
 169         int (*stop_filtering) (struct dmx_section_feed* feed);
 170 };
 171
 172 /*--------------------------------------------------------------------------*/
 173 /* Callback functions */
 174 /*--------------------------------------------------------------------------*/
 175
 176 typedef int (*dmx_ts_cb) ( const u8 * buffer1,
 177                            size_t buffer1_length,
 178                            const u8 * buffer2,
 179                            size_t buffer2_length,
 180                            struct dmx_ts_feed* source,
 181                            enum dmx_success success);
 182
 183 typedef int (*dmx_section_cb) ( const u8 * buffer1,
 184                                 size_t buffer1_len,
 185                                 const u8 * buffer2,
 186                                 size_t buffer2_len,
 187                                 struct dmx_section_filter * source,
 188                                 enum dmx_success success);
 189
 190 /*--------------------------------------------------------------------------*/
 191 /* DVB Front-End */
 192 /*--------------------------------------------------------------------------*/
 193
 194 enum dmx_frontend_source {
 195         DMX_MEMORY_FE,
 196         DMX_FRONTEND_0,
 197         DMX_FRONTEND_1,
 198         DMX_FRONTEND_2,
 199         DMX_FRONTEND_3,
 200         DMX_STREAM_0,    /* external stream input, e.g. LVDS */
 201         DMX_STREAM_1,
 202         DMX_STREAM_2,
 203         DMX_STREAM_3
 204 };
 205
 206 struct dmx_frontend {
 207         struct list_head connectivity_list; /* List of front-ends that can
 208                                                be connected to a particular
 209                                                demux */
 210         void* priv;     /* Pointer to private data of the API client */
 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 #define DMX_SECTION_PAYLOAD_DESCRAMBLING        64
 229 #define DMX_MAC_ADDRESS_DESCRAMBLING            128
 230
 231 /*
 232  * Demux resource type identifier.
 233 */
 234
 235 /*
 236  * DMX_FE_ENTRY(): Casts elements in the list of registered
 237  * front-ends from the generic type struct list_head
 238  * to the type * struct dmx_frontend
 239  *.
 240 */
 241
 242 #define DMX_FE_ENTRY(list) list_entry(list, struct dmx_frontend, connectivity_list)
 243
 244 struct dmx_demux {
 245         u32 capabilities;            /* Bitfield of capability flags */
 246         struct dmx_frontend* frontend;    /* Front-end connected to the demux */
 247         struct list_head reg_list;   /* List of registered demuxes */
 248         void* priv;                  /* Pointer to private data of the API client */
 249         int users;                   /* Number of users */
 250         int (*open) (struct dmx_demux* demux);
 251         int (*close) (struct dmx_demux* demux);
 252         int (*write) (struct dmx_demux* demux, const char* buf, size_t count);
 253         int (*allocate_ts_feed) (struct dmx_demux* demux,
 254                                  struct dmx_ts_feed** feed,
 255                                  dmx_ts_cb callback);
 256         int (*release_ts_feed) (struct dmx_demux* demux,
 257                                 struct dmx_ts_feed* feed);
 258         int (*allocate_section_feed) (struct dmx_demux* demux,
 259                                       struct dmx_section_feed** feed,
 260                                       dmx_section_cb callback);
 261         int (*release_section_feed) (struct dmx_demux* demux,
 262                                      struct dmx_section_feed* feed);
 263         int (*descramble_mac_address) (struct dmx_demux* demux,
 264                                        u8* buffer1,
 265                                        size_t buffer1_length,
 266                                        u8* buffer2,
 267                                        size_t buffer2_length,
 268                                        u16 pid);
 269         int (*descramble_section_payload) (struct dmx_demux* demux,
 270                                            u8* buffer1,
 271                                            size_t buffer1_length,
 272                                            u8* buffer2, size_t buffer2_length,
 273                                            u16 pid);
 274         int (*add_frontend) (struct dmx_demux* demux,
 275                              struct dmx_frontend* frontend);
 276         int (*remove_frontend) (struct dmx_demux* demux,
 277                                 struct dmx_frontend* frontend);
 278         struct list_head* (*get_frontends) (struct dmx_demux* demux);
 279         int (*connect_frontend) (struct dmx_demux* demux,
 280                                  struct dmx_frontend* frontend);
 281         int (*disconnect_frontend) (struct dmx_demux* demux);
 282
 283         int (*get_pes_pids) (struct dmx_demux* demux, u16 *pids);
 284
 285         int (*get_stc) (struct dmx_demux* demux, unsigned int num,
 286                         u64 *stc, unsigned int *base);
 287 };
 288
 289 /*--------------------------------------------------------------------------*/
 290 /* Demux directory */
 291 /*--------------------------------------------------------------------------*/
 292
 293 /*
 294  * DMX_DIR_ENTRY(): Casts elements in the list of registered
 295  * demuxes from the generic type struct list_head* to the type struct dmx_demux
 296  *.
 297  */
 298
 299 #define DMX_DIR_ENTRY(list) list_entry(list, struct dmx_demux, reg_list)
 300
 301 int dmx_register_demux (struct dmx_demux* demux);
 302 int dmx_unregister_demux (struct dmx_demux* demux);
 303 struct list_head* dmx_get_demuxes (void);
 304
 305 #endif /* #ifndef __DEMUX_H */
 306