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 #define TS_DEMUX 8 /* in case TS_PACKET is set, send the TS to 84 the demux device, not to the dvr device */ 85 86 struct dmx_ts_feed { 87 int is_filtering; /* Set to non-zero when filtering in progress */ 88 struct dmx_demux *parent; /* Back-pointer */ 89 void *priv; /* Pointer to private data of the API client */ 90 int (*set) (struct dmx_ts_feed *feed, 91 u16 pid, 92 int type, 93 enum dmx_ts_pes pes_type, 94 size_t circular_buffer_size, 95 struct timespec timeout); 96 int (*start_filtering) (struct dmx_ts_feed* feed); 97 int (*stop_filtering) (struct dmx_ts_feed* feed); 98 }; 99 100 /*--------------------------------------------------------------------------*/ 101 /* Section reception */ 102 /*--------------------------------------------------------------------------*/ 103 104 struct dmx_section_filter { 105 u8 filter_value [DMX_MAX_FILTER_SIZE]; 106 u8 filter_mask [DMX_MAX_FILTER_SIZE]; 107 u8 filter_mode [DMX_MAX_FILTER_SIZE]; 108 struct dmx_section_feed* parent; /* Back-pointer */ 109 void* priv; /* Pointer to private data of the API client */ 110 }; 111 112 struct dmx_section_feed { 113 int is_filtering; /* Set to non-zero when filtering in progress */ 114 struct dmx_demux* parent; /* Back-pointer */ 115 void* priv; /* Pointer to private data of the API client */ 116 117 int check_crc; 118 u32 crc_val; 119 120 u8 *secbuf; 121 u8 secbuf_base[DMX_MAX_SECFEED_SIZE]; 122 u16 secbufp, seclen, tsfeedp; 123 124 int (*set) (struct dmx_section_feed* feed, 125 u16 pid, 126 size_t circular_buffer_size, 127 int check_crc); 128 int (*allocate_filter) (struct dmx_section_feed* feed, 129 struct dmx_section_filter** filter); 130 int (*release_filter) (struct dmx_section_feed* feed, 131 struct dmx_section_filter* filter); 132 int (*start_filtering) (struct dmx_section_feed* feed); 133 int (*stop_filtering) (struct dmx_section_feed* feed); 134 }; 135 136 /*--------------------------------------------------------------------------*/ 137 /* Callback functions */ 138 /*--------------------------------------------------------------------------*/ 139 140 typedef int (*dmx_ts_cb) ( const u8 * buffer1, 141 size_t buffer1_length, 142 const u8 * buffer2, 143 size_t buffer2_length, 144 struct dmx_ts_feed* source, 145 enum dmx_success success); 146 147 typedef int (*dmx_section_cb) ( const u8 * buffer1, 148 size_t buffer1_len, 149 const u8 * buffer2, 150 size_t buffer2_len, 151 struct dmx_section_filter * source, 152 enum dmx_success success); 153 154 /*--------------------------------------------------------------------------*/ 155 /* DVB Front-End */ 156 /*--------------------------------------------------------------------------*/ 157 158 enum dmx_frontend_source { 159 DMX_MEMORY_FE, 160 DMX_FRONTEND_0, 161 DMX_FRONTEND_1, 162 DMX_FRONTEND_2, 163 DMX_FRONTEND_3, 164 DMX_STREAM_0, /* external stream input, e.g. LVDS */ 165 DMX_STREAM_1, 166 DMX_STREAM_2, 167 DMX_STREAM_3 168 }; 169 170 struct dmx_frontend { 171 struct list_head connectivity_list; /* List of front-ends that can 172 be connected to a particular 173 demux */ 174 enum dmx_frontend_source source; 175 }; 176 177 /*--------------------------------------------------------------------------*/ 178 /* MPEG-2 TS Demux */ 179 /*--------------------------------------------------------------------------*/ 180 181 /* 182 * Flags OR'ed in the capabilities field of struct dmx_demux. 183 */ 184 185 #define DMX_TS_FILTERING 1 186 #define DMX_PES_FILTERING 2 187 #define DMX_SECTION_FILTERING 4 188 #define DMX_MEMORY_BASED_FILTERING 8 /* write() available */ 189 #define DMX_CRC_CHECKING 16 190 #define DMX_TS_DESCRAMBLING 32 191 192 /* 193 * Demux resource type identifier. 194 */ 195 196 /* 197 * DMX_FE_ENTRY(): Casts elements in the list of registered 198 * front-ends from the generic type struct list_head 199 * to the type * struct dmx_frontend 200 *. 201 */ 202 203 #define DMX_FE_ENTRY(list) list_entry(list, struct dmx_frontend, connectivity_list) 204 205 struct dmx_demux { 206 u32 capabilities; /* Bitfield of capability flags */ 207 struct dmx_frontend* frontend; /* Front-end connected to the demux */ 208 void* priv; /* Pointer to private data of the API client */ 209 int (*open) (struct dmx_demux* demux); 210 int (*close) (struct dmx_demux* demux); 211 int (*write) (struct dmx_demux* demux, const char __user *buf, size_t count); 212 int (*allocate_ts_feed) (struct dmx_demux* demux, 213 struct dmx_ts_feed** feed, 214 dmx_ts_cb callback); 215 int (*release_ts_feed) (struct dmx_demux* demux, 216 struct dmx_ts_feed* feed); 217 int (*allocate_section_feed) (struct dmx_demux* demux, 218 struct dmx_section_feed** feed, 219 dmx_section_cb callback); 220 int (*release_section_feed) (struct dmx_demux* demux, 221 struct dmx_section_feed* feed); 222 int (*add_frontend) (struct dmx_demux* demux, 223 struct dmx_frontend* frontend); 224 int (*remove_frontend) (struct dmx_demux* demux, 225 struct dmx_frontend* frontend); 226 struct list_head* (*get_frontends) (struct dmx_demux* demux); 227 int (*connect_frontend) (struct dmx_demux* demux, 228 struct dmx_frontend* frontend); 229 int (*disconnect_frontend) (struct dmx_demux* demux); 230 231 int (*get_pes_pids) (struct dmx_demux* demux, u16 *pids); 232 233 int (*get_caps) (struct dmx_demux* demux, struct dmx_caps *caps); 234 235 int (*set_source) (struct dmx_demux* demux, const dmx_source_t *src); 236 237 int (*get_stc) (struct dmx_demux* demux, unsigned int num, 238 u64 *stc, unsigned int *base); 239 }; 240 241 #endif /* #ifndef __DEMUX_H */ 242