1 /* 2 * VIDEO MOTION CODECs internal API for video devices 3 * 4 * Interface for MJPEG (and maybe later MPEG/WAVELETS) codec's 5 * bound to a master device. 6 * 7 * (c) 2002 Wolfgang Scherr <scherr@net4you.at> 8 * 9 * $Id: videocodec.h,v 1.1.2.4 2003/01/14 21:15:03 rbultje Exp $ 10 * 11 * ------------------------------------------------------------------------ 12 * 13 * This program is free software; you can redistribute it and/or modify 14 * it under the terms of the GNU General Public License as published by 15 * the Free Software Foundation; either version 2 of the License, or 16 * (at your option) any later version. 17 * 18 * This program is distributed in the hope that it will be useful, 19 * but WITHOUT ANY WARRANTY; without even the implied warranty of 20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 21 * GNU General Public License for more details. 22 * 23 * You should have received a copy of the GNU General Public License 24 * along with this program; if not, write to the Free Software 25 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 26 * 27 * ------------------------------------------------------------------------ 28 */ 29 30 /* =================== */ 31 /* general description */ 32 /* =================== */ 33 34 /* Should ease the (re-)usage of drivers supporting cards with (different) 35 video codecs. The codecs register to this module their functionality, 36 and the processors (masters) can attach to them if they fit. 37 38 The codecs are typically have a "strong" binding to their master - so I 39 don't think it makes sense to have a full blown interfacing as with e.g. 40 i2c. If you have an other opinion, let's discuss & implement it :-))) 41 42 Usage: 43 44 The slave has just to setup the videocodec structure and use two functions: 45 videocodec_register(codecdata); 46 videocodec_unregister(codecdata); 47 The best is just calling them at module (de-)initialisation. 48 49 The master sets up the structure videocodec_master and calls: 50 codecdata=videocodec_attach(master_codecdata); 51 videocodec_detach(codecdata); 52 53 The slave is called during attach/detach via functions setup previously 54 during register. At that time, the master_data pointer is set up 55 and the slave can access any io registers of the master device (in the case 56 the slave is bound to it). Otherwise it doesn't need this functions and 57 therfor they may not be initialized. 58 59 The other functions are just for convenience, as they are for sure used by 60 most/all of the codecs. The last ones may be omitted, too. 61 62 See the structure declaration below for more information and which data has 63 to be set up for the master and the slave. 64 65 ---------------------------------------------------------------------------- 66 The master should have "knowledge" of the slave and vice versa. So the data 67 structures sent to/from slave via set_data/get_data set_image/get_image are 68 device dependent and vary between MJPEG/MPEG/WAVELET/... devices. (!!!!) 69 ---------------------------------------------------------------------------- 70 */ 71 72 73 /* ========================================== */ 74 /* description of the videocodec_io structure */ 75 /* ========================================== */ 76 77 /* 78 ==== master setup ==== 79 name -> name of the device structure for reference and debugging 80 master_data -> data ref. for the master (e.g. the zr36055,57,67) 81 readreg -> ref. to read-fn from register (setup by master, used by slave) 82 writereg -> ref. to write-fn to register (setup by master, used by slave) 83 this two functions do the lowlevel I/O job 84 85 ==== slave functionality setup ==== 86 slave_data -> data ref. for the slave (e.g. the zr36050,60) 87 check -> fn-ref. checks availability of an device, returns -EIO on failure or 88 the type on success 89 this makes espcecially sense if a driver module supports more than 90 one codec which may be quite similar to access, nevertheless it 91 is good for a first functionality check 92 93 -- main functions you always need for compression/decompression -- 94 95 set_mode -> this fn-ref. resets the entire codec, and sets up the mode 96 with the last defined norm/size (or device default if not 97 available) - it returns 0 if the mode is possible 98 set_size -> this fn-ref. sets the norm and image size for 99 compression/decompression (returns 0 on success) 100 the norm param is defined in videodev2.h (V4L2_STD_*) 101 102 additional setup may be available, too - but the codec should work with 103 some default values even without this 104 105 set_data -> sets device-specific data (tables, quality etc.) 106 get_data -> query device-specific data (tables, quality etc.) 107 108 if the device delivers interrupts, they may be setup/handled here 109 setup_interrupt -> codec irq setup (not needed for 36050/60) 110 handle_interrupt -> codec irq handling (not needed for 36050/60) 111 112 if the device delivers pictures, they may be handled here 113 put_image -> puts image data to the codec (not needed for 36050/60) 114 get_image -> gets image data from the codec (not needed for 36050/60) 115 the calls include frame numbers and flags (even/odd/...) 116 if needed and a flag which allows blocking until its ready 117 */ 118 119 /* ============== */ 120 /* user interface */ 121 /* ============== */ 122 123 /* 124 Currently there is only a information display planned, as the layer 125 is not visible for the user space at all. 126 127 Information is available via procfs. The current entry is "/proc/videocodecs" 128 but it makes sense to "hide" it in the /proc/video tree of v4l(2) --TODO--. 129 130 A example for such an output is: 131 132 <S>lave or attached <M>aster name type flags magic (connected as) 133 S zr36050 0002 0000d001 00000000 (TEMPLATE) 134 M zr36055[0] 0001 0000c001 00000000 (zr36050[0]) 135 M zr36055[1] 0001 0000c001 00000000 (zr36050[1]) 136 137 */ 138 139 140 /* =============================================== */ 141 /* special defines for the videocodec_io structure */ 142 /* =============================================== */ 143 144 #ifndef __LINUX_VIDEOCODEC_H 145 #define __LINUX_VIDEOCODEC_H 146 147 #include <linux/videodev2.h> 148 149 #define CODEC_DO_COMPRESSION 0 150 #define CODEC_DO_EXPANSION 1 151 152 /* this are the current codec flags I think they are needed */ 153 /* -> type value in structure */ 154 #define CODEC_FLAG_JPEG 0x00000001L // JPEG codec 155 #define CODEC_FLAG_MPEG 0x00000002L // MPEG1/2/4 codec 156 #define CODEC_FLAG_DIVX 0x00000004L // DIVX codec 157 #define CODEC_FLAG_WAVELET 0x00000008L // WAVELET codec 158 // room for other types 159 160 #define CODEC_FLAG_MAGIC 0x00000800L // magic key must match 161 #define CODEC_FLAG_HARDWARE 0x00001000L // is a hardware codec 162 #define CODEC_FLAG_VFE 0x00002000L // has direct video frontend 163 #define CODEC_FLAG_ENCODER 0x00004000L // compression capability 164 #define CODEC_FLAG_DECODER 0x00008000L // decompression capability 165 #define CODEC_FLAG_NEEDIRQ 0x00010000L // needs irq handling 166 #define CODEC_FLAG_RDWRPIC 0x00020000L // handles picture I/O 167 168 /* a list of modes, some are just examples (is there any HW?) */ 169 #define CODEC_MODE_BJPG 0x0001 // Baseline JPEG 170 #define CODEC_MODE_LJPG 0x0002 // Lossless JPEG 171 #define CODEC_MODE_MPEG1 0x0003 // MPEG 1 172 #define CODEC_MODE_MPEG2 0x0004 // MPEG 2 173 #define CODEC_MODE_MPEG4 0x0005 // MPEG 4 174 #define CODEC_MODE_MSDIVX 0x0006 // MS DivX 175 #define CODEC_MODE_ODIVX 0x0007 // Open DivX 176 #define CODEC_MODE_WAVELET 0x0008 // Wavelet 177 178 /* this are the current codec types I want to implement */ 179 /* -> type value in structure */ 180 #define CODEC_TYPE_NONE 0 181 #define CODEC_TYPE_L64702 1 182 #define CODEC_TYPE_ZR36050 2 183 #define CODEC_TYPE_ZR36016 3 184 #define CODEC_TYPE_ZR36060 4 185 186 /* the type of data may be enhanced by future implementations (data-fn.'s) */ 187 /* -> used in command */ 188 #define CODEC_G_STATUS 0x0000 /* codec status (query only) */ 189 #define CODEC_S_CODEC_MODE 0x0001 /* codec mode (baseline JPEG, MPEG1,... */ 190 #define CODEC_G_CODEC_MODE 0x8001 191 #define CODEC_S_VFE 0x0002 /* additional video frontend setup */ 192 #define CODEC_G_VFE 0x8002 193 #define CODEC_S_MMAP 0x0003 /* MMAP setup (if available) */ 194 195 #define CODEC_S_JPEG_TDS_BYTE 0x0010 /* target data size in bytes */ 196 #define CODEC_G_JPEG_TDS_BYTE 0x8010 197 #define CODEC_S_JPEG_SCALE 0x0011 /* scaling factor for quant. tables */ 198 #define CODEC_G_JPEG_SCALE 0x8011 199 #define CODEC_S_JPEG_HDT_DATA 0x0018 /* huffman-tables */ 200 #define CODEC_G_JPEG_HDT_DATA 0x8018 201 #define CODEC_S_JPEG_QDT_DATA 0x0019 /* quantizing-tables */ 202 #define CODEC_G_JPEG_QDT_DATA 0x8019 203 #define CODEC_S_JPEG_APP_DATA 0x001A /* APP marker */ 204 #define CODEC_G_JPEG_APP_DATA 0x801A 205 #define CODEC_S_JPEG_COM_DATA 0x001B /* COM marker */ 206 #define CODEC_G_JPEG_COM_DATA 0x801B 207 208 #define CODEC_S_PRIVATE 0x1000 /* "private" commands start here */ 209 #define CODEC_G_PRIVATE 0x9000 210 211 #define CODEC_G_FLAG 0x8000 /* this is how 'get' is detected */ 212 213 /* types of transfer, directly user space or a kernel buffer (image-fn.'s) */ 214 /* -> used in get_image, put_image */ 215 #define CODEC_TRANSFER_KERNEL 0 /* use "memcopy" */ 216 #define CODEC_TRANSFER_USER 1 /* use "to/from_user" */ 217 218 219 /* ========================= */ 220 /* the structures itself ... */ 221 /* ========================= */ 222 223 struct vfe_polarity { 224 unsigned int vsync_pol:1; 225 unsigned int hsync_pol:1; 226 unsigned int field_pol:1; 227 unsigned int blank_pol:1; 228 unsigned int subimg_pol:1; 229 unsigned int poe_pol:1; 230 unsigned int pvalid_pol:1; 231 unsigned int vclk_pol:1; 232 }; 233 234 struct vfe_settings { 235 __u32 x, y; /* Offsets into image */ 236 __u32 width, height; /* Area to capture */ 237 __u16 decimation; /* Decimation divider */ 238 __u16 flags; /* Flags for capture */ 239 __u16 quality; /* quality of the video */ 240 }; 241 242 struct tvnorm { 243 u16 Wt, Wa, HStart, HSyncStart, Ht, Ha, VStart; 244 }; 245 246 struct jpeg_com_marker { 247 int len; /* number of usable bytes in data */ 248 char data[60]; 249 }; 250 251 struct jpeg_app_marker { 252 int appn; /* number app segment */ 253 int len; /* number of usable bytes in data */ 254 char data[60]; 255 }; 256 257 struct videocodec { 258 struct module *owner; 259 /* -- filled in by slave device during register -- */ 260 char name[32]; 261 unsigned long magic; /* may be used for client<->master attaching */ 262 unsigned long flags; /* functionality flags */ 263 unsigned int type; /* codec type */ 264 265 /* -- these is filled in later during master device attach -- */ 266 267 struct videocodec_master *master_data; 268 269 /* -- these are filled in by the slave device during register -- */ 270 271 void *data; /* private slave data */ 272 273 /* attach/detach client functions (indirect call) */ 274 int (*setup) (struct videocodec * codec); 275 int (*unset) (struct videocodec * codec); 276 277 /* main functions, every client needs them for sure! */ 278 // set compression or decompression (or freeze, stop, standby, etc) 279 int (*set_mode) (struct videocodec * codec, 280 int mode); 281 // setup picture size and norm (for the codec's video frontend) 282 int (*set_video) (struct videocodec * codec, 283 struct tvnorm * norm, 284 struct vfe_settings * cap, 285 struct vfe_polarity * pol); 286 // other control commands, also mmap setup etc. 287 int (*control) (struct videocodec * codec, 288 int type, 289 int size, 290 void *data); 291 292 /* additional setup/query/processing (may be NULL pointer) */ 293 // interrupt setup / handling (for irq's delivered by master) 294 int (*setup_interrupt) (struct videocodec * codec, 295 long mode); 296 int (*handle_interrupt) (struct videocodec * codec, 297 int source, 298 long flag); 299 // picture interface (if any) 300 long (*put_image) (struct videocodec * codec, 301 int tr_type, 302 int block, 303 long *fr_num, 304 long *flag, 305 long size, 306 void *buf); 307 long (*get_image) (struct videocodec * codec, 308 int tr_type, 309 int block, 310 long *fr_num, 311 long *flag, 312 long size, 313 void *buf); 314 }; 315 316 struct videocodec_master { 317 /* -- filled in by master device for registration -- */ 318 char name[32]; 319 unsigned long magic; /* may be used for client<->master attaching */ 320 unsigned long flags; /* functionality flags */ 321 unsigned int type; /* master type */ 322 323 void *data; /* private master data */ 324 325 __u32(*readreg) (struct videocodec * codec, 326 __u16 reg); 327 void (*writereg) (struct videocodec * codec, 328 __u16 reg, 329 __u32 value); 330 }; 331 332 333 /* ================================================= */ 334 /* function prototypes of the master/slave interface */ 335 /* ================================================= */ 336 337 /* attach and detach commands for the master */ 338 // * master structure needs to be kmalloc'ed before calling attach 339 // and free'd after calling detach 340 // * returns pointer on success, NULL on failure 341 extern struct videocodec *videocodec_attach(struct videocodec_master *); 342 // * 0 on success, <0 (errno) on failure 343 extern int videocodec_detach(struct videocodec *); 344 345 /* register and unregister commands for the slaves */ 346 // * 0 on success, <0 (errno) on failure 347 extern int videocodec_register(const struct videocodec *); 348 // * 0 on success, <0 (errno) on failure 349 extern int videocodec_unregister(const struct videocodec *); 350 351 /* the other calls are directly done via the videocodec structure! */ 352 353 #endif /*ifndef __LINUX_VIDEOCODEC_H */ 354