drivers/media/video/zoran/videocodec.h

   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 \f
  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 \f
 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 \f
 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 \f
 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 \f
 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 */