granicus.if.org Git - strace/blob - v4l2.c

   1 /*
   2  * Copyright (c) 2014 Philippe De Muyter <phdm@macqel.be>
   3  * Copyright (c) 2014 William Manley <will@williammanley.net>
   4  * Copyright (c) 2011 Peter Zotov <whitequark@whitequark.org>
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. The name of the author may not be used to endorse or promote products
  16  *    derived from this software without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28  */
  29
  30 #include "defs.h"
  31
  32 #include DEF_MPERS_TYPE(struct_v4l2_buffer)
  33 #include DEF_MPERS_TYPE(struct_v4l2_create_buffers)
  34 #include DEF_MPERS_TYPE(struct_v4l2_ext_control)
  35 #include DEF_MPERS_TYPE(struct_v4l2_ext_controls)
  36 #include DEF_MPERS_TYPE(struct_v4l2_format)
  37 #include DEF_MPERS_TYPE(struct_v4l2_framebuffer)
  38 #include DEF_MPERS_TYPE(struct_v4l2_input)
  39 #include DEF_MPERS_TYPE(struct_v4l2_standard)
  40
  41 #include <stdint.h>
  42 #include <linux/ioctl.h>
  43 #include <linux/types.h>
  44 #include <linux/videodev2.h>
  45
  46 typedef struct v4l2_buffer struct_v4l2_buffer;
  47 typedef struct v4l2_create_buffers struct_v4l2_create_buffers;
  48 typedef struct v4l2_ext_control struct_v4l2_ext_control;
  49 typedef struct v4l2_ext_controls struct_v4l2_ext_controls;
  50 typedef struct v4l2_format struct_v4l2_format;
  51 typedef struct v4l2_framebuffer struct_v4l2_framebuffer;
  52 typedef struct v4l2_input struct_v4l2_input;
  53 typedef struct v4l2_standard struct_v4l2_standard;
  54
  55 #include MPERS_DEFS
  56
  57 /* some historical constants */
  58 #ifndef V4L2_CID_HCENTER
  59 #define V4L2_CID_HCENTER (V4L2_CID_BASE+22)
  60 #endif
  61 #ifndef V4L2_CID_VCENTER
  62 #define V4L2_CID_VCENTER (V4L2_CID_BASE+23)
  63 #endif
  64 #ifndef V4L2_CID_BAND_STOP_FILTER
  65 #define V4L2_CID_BAND_STOP_FILTER (V4L2_CID_BASE+33)
  66 #endif
  67
  68 #define FMT_FRACT "%u/%u"
  69 #define ARGS_FRACT(x) ((x).numerator), ((x).denominator)
  70
  71 #define FMT_RECT "{left=%d, top=%d, width=%u, height=%u}"
  72 #define ARGS_RECT(x) (x).left, (x).top, (x).width, (x).height
  73
  74 static void
  75 print_pixelformat(uint32_t fourcc)
  76 {
  77         const union {
  78                 uint32_t pixelformat;
  79                 unsigned char cc[sizeof(uint32_t)];
  80         } u = {
  81 #if WORDS_BIGENDIAN
  82                 .cc = {
  83                         (unsigned char) (fourcc >> 24),
  84                         (unsigned char) (fourcc >> 16),
  85                         (unsigned char) (fourcc >> 8),
  86                         (unsigned char) fourcc
  87                 }
  88 #else
  89                 .pixelformat = fourcc
  90 #endif
  91         };
  92         unsigned int i;
  93
  94         tprints("v4l2_fourcc(");
  95         for (i = 0; i < sizeof(u.cc); ++i) {
  96                 unsigned char c = u.cc[i];
  97
  98                 if (i)
  99                         tprints(", ");
 100                 if (c == '\'' || c == '\\') {
 101                         char sym[] = {
 102                                 '\'',
 103                                 '\\',
 104                                 c,
 105                                 '\'',
 106                                 '\0'
 107                         };
 108                         tprints(sym);
 109                 } else if (c >= ' ' && c <= 0x7e) {
 110                         char sym[] = {
 111                                 '\'',
 112                                 c,
 113                                 '\'',
 114                                 '\0'
 115                         };
 116                         tprints(sym);
 117                 } else {
 118                         char hex[] = {
 119                                 '\'',
 120                                 '\\',
 121                                 'x',
 122                                 "0123456789abcdef"[c >> 4],
 123                                 "0123456789abcdef"[c & 0xf],
 124                                 '\'',
 125                                 '\0'
 126                         };
 127                         tprints(hex);
 128                 }
 129         }
 130         tprints(")");
 131 }
 132
 133 #include "xlat/v4l2_device_capabilities_flags.h"
 134
 135 static int
 136 print_v4l2_capability(struct tcb *tcp, const long arg)
 137 {
 138         struct v4l2_capability caps;
 139
 140         if (entering(tcp))
 141                 return 0;
 142         tprints(", ");
 143         if (umove_or_printaddr(tcp, arg, &caps))
 144                 return 1;
 145         tprints("{driver=");
 146         print_quoted_string((const char *) caps.driver,
 147                             sizeof(caps.driver), QUOTE_0_TERMINATED);
 148         tprints(", card=");
 149         print_quoted_string((const char *) caps.card,
 150                             sizeof(caps.card), QUOTE_0_TERMINATED);
 151         tprints(", bus_info=");
 152         print_quoted_string((const char *) caps.bus_info,
 153                             sizeof(caps.bus_info), QUOTE_0_TERMINATED);
 154         tprintf(", version=%u.%u.%u, capabilities=",
 155                 (caps.version >> 16) & 0xFF,
 156                 (caps.version >> 8) & 0xFF,
 157                 caps.version & 0xFF);
 158         printflags(v4l2_device_capabilities_flags, caps.capabilities,
 159                    "V4L2_CAP_???");
 160 #ifdef V4L2_CAP_DEVICE_CAPS
 161         tprints(", device_caps=");
 162         printflags(v4l2_device_capabilities_flags, caps.device_caps,
 163                    "V4L2_CAP_???");
 164 #endif
 165         tprints("}");
 166         return 1;
 167 }
 168
 169 #include "xlat/v4l2_buf_types.h"
 170 #include "xlat/v4l2_format_description_flags.h"
 171
 172 static int
 173 print_v4l2_fmtdesc(struct tcb *tcp, const long arg)
 174 {
 175         struct v4l2_fmtdesc f;
 176
 177         if (entering(tcp)) {
 178                 tprints(", ");
 179                 if (umove_or_printaddr(tcp, arg, &f))
 180                         return RVAL_DECODED | 1;
 181                 tprintf("{index=%u, type=", f.index);
 182                 printxval(v4l2_buf_types, f.type, "V4L2_BUF_TYPE_???");
 183                 return 0;
 184         }
 185
 186         if (!syserror(tcp) && !umove(tcp, arg, &f)) {
 187                 tprints(", flags=");
 188                 printflags(v4l2_format_description_flags, f.flags,
 189                            "V4L2_FMT_FLAG_???");
 190                 tprints(", description=");
 191                 print_quoted_string((const char *) f.description,
 192                                     sizeof(f.description),
 193                                     QUOTE_0_TERMINATED);
 194                 tprints(", pixelformat=");
 195                 print_pixelformat(f.pixelformat);
 196         }
 197         tprints("}");
 198         return 1;
 199 }
 200
 201 #include "xlat/v4l2_fields.h"
 202 #include "xlat/v4l2_colorspaces.h"
 203
 204 static void
 205 print_v4l2_format_fmt(const char *prefix, const struct_v4l2_format *f)
 206 {
 207         switch (f->type) {
 208         case V4L2_BUF_TYPE_VIDEO_CAPTURE:
 209         case V4L2_BUF_TYPE_VIDEO_OUTPUT:
 210                 tprints(prefix);
 211                 tprintf("fmt.pix={width=%u, height=%u, pixelformat=",
 212                         f->fmt.pix.width, f->fmt.pix.height);
 213                 print_pixelformat(f->fmt.pix.pixelformat);
 214                 tprints(", field=");
 215                 printxval(v4l2_fields, f->fmt.pix.field, "V4L2_FIELD_???");
 216                 tprintf(", bytesperline=%u, sizeimage=%u, colorspace=",
 217                         f->fmt.pix.bytesperline, f->fmt.pix.sizeimage);
 218                 printxval(v4l2_colorspaces, f->fmt.pix.colorspace,
 219                           "V4L2_COLORSPACE_???");
 220                 tprints("}");
 221                 break;
 222 #if HAVE_DECL_V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE
 223         case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
 224         case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE: {
 225                 unsigned int i, max;
 226
 227                 tprints(prefix);
 228                 tprintf("fmt.pix_mp={width=%u, height=%u, pixelformat=",
 229                         f->fmt.pix_mp.width, f->fmt.pix_mp.height);
 230                 print_pixelformat(f->fmt.pix_mp.pixelformat);
 231                 tprints(", field=");
 232                 printxval(v4l2_fields, f->fmt.pix_mp.field, "V4L2_FIELD_???");
 233                 tprints(", colorspace=");
 234                 printxval(v4l2_colorspaces, f->fmt.pix_mp.colorspace,
 235                           "V4L2_COLORSPACE_???");
 236                 tprints(", plane_fmt=[");
 237                 max = f->fmt.pix_mp.num_planes;
 238                 if (max > VIDEO_MAX_PLANES)
 239                         max = VIDEO_MAX_PLANES;
 240                 for (i = 0; i < max; i++) {
 241                         if (i > 0)
 242                                 tprints(", ");
 243                         tprintf("{sizeimage=%u, bytesperline=%u}",
 244                                 f->fmt.pix_mp.plane_fmt[i].sizeimage,
 245                                 f->fmt.pix_mp.plane_fmt[i].bytesperline);
 246                 }
 247                 tprintf("], num_planes=%u}", (unsigned) f->fmt.pix_mp.num_planes);
 248                 break;
 249         }
 250 #endif
 251
 252         /* TODO: Complete this switch statement */
 253 #if 0
 254         case V4L2_BUF_TYPE_VIDEO_OVERLAY:
 255 #if HAVE_DECL_V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY
 256         case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
 257 #endif
 258                 tprints(prefix);
 259                 tprints("fmt.win={???}");
 260                 break;
 261
 262         case V4L2_BUF_TYPE_VBI_CAPTURE:
 263         case V4L2_BUF_TYPE_VBI_OUTPUT:
 264                 tprints(prefix);
 265                 tprints("fmt.vbi={???}");
 266                 break;
 267
 268         case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
 269         case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
 270                 tprints(prefix);
 271                 tprints("fmt.sliced={???}");
 272                 break;
 273
 274 #if HAVE_DECL_V4L2_BUF_TYPE_SDR_CAPTURE
 275         case V4L2_BUF_TYPE_SDR_CAPTURE:
 276         case V4L2_BUF_TYPE_SDR_OUTPUT:
 277                 tprints(prefix);
 278                 tprints("fmt.sdr={???}");
 279                 break;
 280 #endif
 281 #endif
 282         }
 283 }
 284
 285 static int
 286 print_v4l2_format(struct tcb *tcp, const long arg, const bool is_get)
 287 {
 288         struct_v4l2_format f;
 289
 290         if (entering(tcp)) {
 291                 tprints(", ");
 292                 if (umove_or_printaddr(tcp, arg, &f))
 293                         return RVAL_DECODED | 1;
 294                 tprints("{type=");
 295                 printxval(v4l2_buf_types, f.type, "V4L2_BUF_TYPE_???");
 296                 if (is_get)
 297                         return 0;
 298                 print_v4l2_format_fmt(", ", &f);
 299         } else {
 300                 if (!syserror(tcp) && !umove(tcp, arg, &f)) {
 301                         const char *delim = is_get ? ", " : " => ";
 302                         print_v4l2_format_fmt(delim, &f);
 303                 }
 304                 tprints("}");
 305         }
 306         return 1;
 307 }
 308
 309 #include "xlat/v4l2_memories.h"
 310
 311 static int
 312 print_v4l2_requestbuffers(struct tcb *tcp, const long arg)
 313 {
 314         struct v4l2_requestbuffers reqbufs;
 315
 316         if (entering(tcp)) {
 317                 tprints(", ");
 318                 if (umove_or_printaddr(tcp, arg, &reqbufs))
 319                         return RVAL_DECODED | 1;
 320                 tprintf("{count=%u, type=", reqbufs.count);
 321                 printxval(v4l2_buf_types, reqbufs.type, "V4L2_BUF_TYPE_???");
 322                 tprints(", memory=");
 323                 printxval(v4l2_memories, reqbufs.memory, "V4L2_MEMORY_???");
 324                 tprints("}");
 325                 return 0;
 326         } else {
 327                 static char outstr[sizeof("{count=}") + sizeof(int) * 3];
 328
 329                 if (syserror(tcp) || umove(tcp, arg, &reqbufs) < 0)
 330                         return 1;
 331                 sprintf(outstr, "{count=%u}", reqbufs.count);
 332                 tcp->auxstr = outstr;
 333                 return 1 + RVAL_STR;
 334         }
 335 }
 336
 337 #include "xlat/v4l2_buf_flags.h"
 338
 339 static int
 340 print_v4l2_buffer(struct tcb *tcp, const unsigned int code, const long arg)
 341 {
 342         struct_v4l2_buffer b;
 343
 344         if (entering(tcp)) {
 345                 tprints(", ");
 346                 if (umove_or_printaddr(tcp, arg, &b))
 347                         return RVAL_DECODED | 1;
 348                 tprints("{type=");
 349                 printxval(v4l2_buf_types, b.type, "V4L2_BUF_TYPE_???");
 350                 if (code != VIDIOC_DQBUF)
 351                         tprintf(", index=%u", b.index);
 352         } else {
 353                 if (!syserror(tcp) && umove(tcp, arg, &b) == 0) {
 354                         if (code == VIDIOC_DQBUF)
 355                                 tprintf(", index=%u", b.index);
 356                         tprints(", memory=");
 357                         printxval(v4l2_memories, b.memory, "V4L2_MEMORY_???");
 358
 359                         if (b.memory == V4L2_MEMORY_MMAP) {
 360                                 tprintf(", m.offset=%#x", b.m.offset);
 361                         } else if (b.memory == V4L2_MEMORY_USERPTR) {
 362                                 tprints(", m.userptr=");
 363                                 printaddr((unsigned long) b.m.userptr);
 364                         }
 365
 366                         tprintf(", length=%u, bytesused=%u, flags=",
 367                                 b.length, b.bytesused);
 368                         printflags(v4l2_buf_flags, b.flags, "V4L2_BUF_FLAG_???");
 369                         if (code == VIDIOC_DQBUF) {
 370                                 tprints(", timestamp = ");
 371                                 MPERS_FUNC_NAME(print_struct_timeval)(&b.timestamp);
 372                         }
 373                         tprints(", ...");
 374                 }
 375                 tprints("}");
 376         }
 377         return 1;
 378 }
 379
 380 static int
 381 print_v4l2_framebuffer(struct tcb *tcp, const long arg)
 382 {
 383         struct_v4l2_framebuffer b;
 384
 385         tprints(", ");
 386         if (!umove_or_printaddr(tcp, arg, &b)) {
 387                 tprintf("{capability=%#x, flags=%#x, base=",
 388                         b.capability, b.flags);
 389                 printaddr((unsigned long) b.base);
 390                 tprints("}");
 391         }
 392
 393         return RVAL_DECODED | 1;
 394 }
 395
 396 static int
 397 print_v4l2_buf_type(struct tcb *tcp, const long arg)
 398 {
 399         int type;
 400
 401         tprints(", ");
 402         if (!umove_or_printaddr(tcp, arg, &type)) {
 403                 tprints("[");
 404                 printxval(v4l2_buf_types, type, "V4L2_BUF_TYPE_???");
 405                 tprints("]");
 406         }
 407         return RVAL_DECODED | 1;
 408 }
 409
 410 #include "xlat/v4l2_streaming_capabilities.h"
 411 #include "xlat/v4l2_capture_modes.h"
 412
 413 static int
 414 print_v4l2_streamparm(struct tcb *tcp, const long arg, const bool is_get)
 415 {
 416         struct v4l2_streamparm s;
 417
 418         if (entering(tcp)) {
 419                 tprints(", ");
 420                 if (umove_or_printaddr(tcp, arg, &s))
 421                         return RVAL_DECODED | 1;
 422                 tprints("{type=");
 423                 printxval(v4l2_buf_types, s.type, "V4L2_BUF_TYPE_???");
 424                 switch (s.type) {
 425                         case V4L2_BUF_TYPE_VIDEO_CAPTURE:
 426                         case V4L2_BUF_TYPE_VIDEO_OUTPUT:
 427                                 if (is_get)
 428                                         return 0;
 429                                 tprints(", ");
 430                                 break;
 431                         default:
 432                                 tprints("}");
 433                                 return RVAL_DECODED | 1;
 434                 }
 435         } else {
 436                 if (syserror(tcp) || umove(tcp, arg, &s) < 0) {
 437                         tprints("}");
 438                         return 1;
 439                 }
 440                 tprints(is_get ? ", " : " => ");
 441         }
 442
 443         if (s.type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
 444                 tprints("parm.capture={capability=");
 445                 printflags(v4l2_streaming_capabilities,
 446                            s.parm.capture.capability, "V4L2_CAP_???");
 447
 448                 tprints(", capturemode=");
 449                 printflags(v4l2_capture_modes,
 450                            s.parm.capture.capturemode, "V4L2_MODE_???");
 451
 452                 tprintf(", timeperframe=" FMT_FRACT,
 453                         ARGS_FRACT(s.parm.capture.timeperframe));
 454
 455                 tprintf(", extendedmode=%u, readbuffers=%u}",
 456                         s.parm.capture.extendedmode,
 457                         s.parm.capture.readbuffers);
 458         } else {
 459                 tprints("parm.output={capability=");
 460                 printflags(v4l2_streaming_capabilities,
 461                            s.parm.output.capability, "V4L2_CAP_???");
 462
 463                 tprintf(", outputmode=%u", s.parm.output.outputmode);
 464
 465                 tprintf(", timeperframe=" FMT_FRACT,
 466                         ARGS_FRACT(s.parm.output.timeperframe));
 467
 468                 tprintf(", extendedmode=%u, writebuffers=%u}",
 469                         s.parm.output.extendedmode,
 470                         s.parm.output.writebuffers);
 471         }
 472         if (exiting(tcp))
 473                 tprints("}");
 474         return 1;
 475 }
 476
 477 static int
 478 print_v4l2_standard(struct tcb *tcp, const long arg)
 479 {
 480         struct_v4l2_standard s;
 481
 482         if (entering(tcp)) {
 483                 tprints(", ");
 484                 if (umove_or_printaddr(tcp, arg, &s))
 485                         return RVAL_DECODED | 1;
 486                 tprintf("{index=%u", s.index);
 487         } else {
 488                 if (!syserror(tcp) && !umove(tcp, arg, &s)) {
 489                         tprints(", name=");
 490                         print_quoted_string((const char *) s.name,
 491                                             sizeof(s.name),
 492                                             QUOTE_0_TERMINATED);
 493                         tprintf(", frameperiod=" FMT_FRACT,
 494                                 ARGS_FRACT(s.frameperiod));
 495                         tprintf(", framelines=%d", s.framelines);
 496                 }
 497                 tprints("}");
 498         }
 499         return 1;
 500 }
 501
 502 #include "xlat/v4l2_input_types.h"
 503
 504 static int
 505 print_v4l2_input(struct tcb *tcp, const long arg)
 506 {
 507         struct_v4l2_input i;
 508
 509         if (entering(tcp)) {
 510                 tprints(", ");
 511                 if (umove_or_printaddr(tcp, arg, &i))
 512                         return RVAL_DECODED | 1;
 513                 tprintf("{index=%u", i.index);
 514         } else {
 515                 if (!syserror(tcp) && !umove(tcp, arg, &i)) {
 516                         tprints(", name=");
 517                         print_quoted_string((const char *) i.name,
 518                                             sizeof(i.name),
 519                                             QUOTE_0_TERMINATED);
 520                         tprints(", type=");
 521                         printxval(v4l2_input_types, i.type,
 522                                   "V4L2_INPUT_TYPE_???");
 523                 }
 524                 tprints("}");
 525         }
 526         return 1;
 527 }
 528
 529 #include "xlat/v4l2_control_ids.h"
 530
 531 static int
 532 print_v4l2_control(struct tcb *tcp, const long arg, const bool is_get)
 533 {
 534         struct v4l2_control c;
 535
 536         if (entering(tcp)) {
 537                 tprints(", ");
 538                 if (umove_or_printaddr(tcp, arg, &c))
 539                         return RVAL_DECODED | 1;
 540                 tprints("{id=");
 541                 printxval(v4l2_control_ids, c.id, "V4L2_CID_???");
 542                 if (!is_get)
 543                         tprintf(", value=%d", c.value);
 544                 return 0;
 545         }
 546
 547         if (!syserror(tcp) && !umove(tcp, arg, &c)) {
 548                 tprints(is_get ? ", " : " => ");
 549                 tprintf("value=%d", c.value);
 550         }
 551
 552         tprints("}");
 553         return 1;
 554 }
 555
 556 #include "xlat/v4l2_control_types.h"
 557 #include "xlat/v4l2_control_flags.h"
 558
 559 static int
 560 print_v4l2_queryctrl(struct tcb *tcp, const long arg)
 561 {
 562         struct v4l2_queryctrl c;
 563
 564         if (entering(tcp)) {
 565                 tprints(", ");
 566                 if (umove_or_printaddr(tcp, arg, &c))
 567                         return RVAL_DECODED | 1;
 568                 tprints("{id=");
 569         } else {
 570                 if (syserror(tcp) || umove(tcp, arg, &c) < 0) {
 571                         tprints("}");
 572                         return 1;
 573                 }
 574                 if (get_tcb_priv_ulong(tcp))
 575                         tprints(" => ");
 576         }
 577
 578         if (entering(tcp) || get_tcb_priv_ulong(tcp)) {
 579 #ifdef V4L2_CTRL_FLAG_NEXT_CTRL
 580                 const unsigned long next = c.id & V4L2_CTRL_FLAG_NEXT_CTRL;
 581                 set_tcb_priv_ulong(tcp, next);
 582                 if (next) {
 583                         tprints("V4L2_CTRL_FLAG_NEXT_CTRL|");
 584                         c.id &= ~V4L2_CTRL_FLAG_NEXT_CTRL;
 585                 }
 586 #endif
 587                 printxval(v4l2_control_ids, c.id, "V4L2_CID_???");
 588         }
 589
 590         if (exiting(tcp)) {
 591                 tprints(", type=");
 592                 printxval(v4l2_control_types, c.type, "V4L2_CTRL_TYPE_???");
 593                 tprints(", name=");
 594                 print_quoted_string((const char *) c.name,
 595                                     sizeof(c.name),
 596                                     QUOTE_0_TERMINATED);
 597                 tprintf(", minimum=%d, maximum=%d, step=%d"
 598                         ", default_value=%d, flags=",
 599                         c.minimum, c.maximum, c.step, c.default_value);
 600                 printflags(v4l2_control_flags, c.flags, "V4L2_CTRL_FLAG_???");
 601                 tprints("}");
 602         }
 603         return 1;
 604 }
 605
 606 static int
 607 print_v4l2_cropcap(struct tcb *tcp, const long arg)
 608 {
 609         struct v4l2_cropcap c;
 610
 611         if (entering(tcp)) {
 612                 tprints(", ");
 613                 if (umove_or_printaddr(tcp, arg, &c))
 614                         return RVAL_DECODED | 1;
 615                 tprints("{type=");
 616                 printxval(v4l2_buf_types, c.type, "V4L2_BUF_TYPE_???");
 617                 return 0;
 618         }
 619         if (!syserror(tcp) && !umove(tcp, arg, &c)) {
 620                 tprintf(", bounds=" FMT_RECT
 621                         ", defrect=" FMT_RECT
 622                         ", pixelaspect=" FMT_FRACT,
 623                         ARGS_RECT(c.bounds),
 624                         ARGS_RECT(c.defrect),
 625                         ARGS_FRACT(c.pixelaspect));
 626         }
 627         tprints("}");
 628         return 1;
 629 }
 630
 631 static int
 632 print_v4l2_crop(struct tcb *tcp, const long arg, const bool is_get)
 633 {
 634         struct v4l2_crop c;
 635
 636         if (entering(tcp)) {
 637                 tprints(", ");
 638                 if (umove_or_printaddr(tcp, arg, &c))
 639                         return RVAL_DECODED | 1;
 640                 tprints("{type=");
 641                 printxval(v4l2_buf_types, c.type, "V4L2_BUF_TYPE_???");
 642                 if (is_get)
 643                         return 0;
 644                 tprintf(", c=" FMT_RECT, ARGS_RECT(c.c));
 645         } else {
 646                 if (!syserror(tcp) && !umove(tcp, arg, &c))
 647                         tprintf(", c=" FMT_RECT, ARGS_RECT(c.c));
 648         }
 649
 650         tprints("}");
 651         return RVAL_DECODED | 1;
 652 }
 653
 654 #ifdef VIDIOC_S_EXT_CTRLS
 655 static bool
 656 print_v4l2_ext_control(struct tcb *tcp, void *elem_buf, size_t elem_size, void *data)
 657 {
 658         const struct_v4l2_ext_control *p = elem_buf;
 659
 660         tprints("{id=");
 661         printxval(v4l2_control_ids, p->id, "V4L2_CID_???");
 662 # if HAVE_DECL_V4L2_CTRL_TYPE_STRING
 663         tprintf(", size=%u", p->size);
 664         if (p->size > 0) {
 665                 tprints(", string=");
 666                 printstr(tcp, (long) p->string, p->size);
 667         } else
 668 # endif
 669         tprintf(", value=%d, value64=%" PRId64, p->value, (int64_t) p->value64);
 670         tprints("}");
 671
 672         return true;
 673 }
 674
 675 #include "xlat/v4l2_control_classes.h"
 676
 677 static int
 678 print_v4l2_ext_controls(struct tcb *tcp, const long arg, const bool is_get)
 679 {
 680         struct_v4l2_ext_controls c;
 681
 682         if (entering(tcp)) {
 683                 tprints(", ");
 684                 if (umove_or_printaddr(tcp, arg, &c))
 685                         return RVAL_DECODED | 1;
 686                 tprints("{ctrl_class=");
 687                 printxval(v4l2_control_classes, c.ctrl_class,
 688                           "V4L2_CTRL_CLASS_???");
 689                 tprintf(", count=%u", c.count);
 690                 if (!c.count) {
 691                         tprints("}");
 692                         return RVAL_DECODED | 1;
 693                 }
 694                 if (is_get)
 695                         return 0;
 696                 tprints(", ");
 697         } else {
 698                 if (umove(tcp, arg, &c) < 0) {
 699                         tprints("}");
 700                         return 1;
 701                 }
 702                 tprints(is_get ? ", " : " => ");
 703         }
 704
 705         tprints("controls=");
 706         struct_v4l2_ext_control ctrl;
 707         bool fail = !print_array(tcp, (unsigned long) c.controls, c.count,
 708                                  &ctrl, sizeof(ctrl),
 709                                  umoven_or_printaddr_ignore_syserror,
 710                                  print_v4l2_ext_control, 0);
 711
 712         if (exiting(tcp) && syserror(tcp))
 713                 tprintf(", error_idx=%u", c.error_idx);
 714
 715         if (exiting(tcp) || fail) {
 716                 tprints("}");
 717                 return RVAL_DECODED | 1;
 718         }
 719         return 1;
 720 }
 721 #endif /* VIDIOC_S_EXT_CTRLS */
 722
 723 #ifdef VIDIOC_ENUM_FRAMESIZES
 724 # include "xlat/v4l2_framesize_types.h"
 725
 726 static int
 727 print_v4l2_frmsizeenum(struct tcb *tcp, const long arg)
 728 {
 729         struct v4l2_frmsizeenum s;
 730
 731         if (entering(tcp)) {
 732                 tprints(", ");
 733                 if (umove_or_printaddr(tcp, arg, &s))
 734                         return RVAL_DECODED | 1;
 735                 tprintf("{index=%u, pixel_format=", s.index);
 736                 print_pixelformat(s.pixel_format);
 737                 return 0;
 738         }
 739
 740         if (!syserror(tcp) && !umove(tcp, arg, &s)) {
 741                 tprints(", type=");
 742                 printxval(v4l2_framesize_types, s.type, "V4L2_FRMSIZE_TYPE_???");
 743                 switch (s.type) {
 744                 case V4L2_FRMSIZE_TYPE_DISCRETE:
 745                         tprintf(", discrete={width=%u, height=%u}",
 746                                 s.discrete.width, s.discrete.height);
 747                         break;
 748                 case V4L2_FRMSIZE_TYPE_STEPWISE:
 749                         tprintf(", stepwise={min_width=%u, max_width=%u, "
 750                                 "step_width=%u, min_height=%u, max_height=%u, "
 751                                 "step_height=%u}",
 752                                 s.stepwise.min_width, s.stepwise.max_width,
 753                                 s.stepwise.step_width, s.stepwise.min_height,
 754                                 s.stepwise.max_height, s.stepwise.step_height);
 755                         break;
 756                 }
 757         }
 758         tprints("}");
 759         return 1;
 760 }
 761 #endif /* VIDIOC_ENUM_FRAMESIZES */
 762
 763 #ifdef VIDIOC_ENUM_FRAMEINTERVALS
 764 # include "xlat/v4l2_frameinterval_types.h"
 765
 766 static int
 767 print_v4l2_frmivalenum(struct tcb *tcp, const long arg)
 768 {
 769         struct v4l2_frmivalenum f;
 770
 771         if (entering(tcp)) {
 772                 tprints(", ");
 773                 if (umove_or_printaddr(tcp, arg, &f))
 774                         return RVAL_DECODED | 1;
 775                 tprintf("{index=%u, pixel_format=", f.index);
 776                 print_pixelformat(f.pixel_format);
 777                 tprintf(", width=%u, height=%u", f.width, f.height);
 778                 return 0;
 779         }
 780         if (!syserror(tcp) && !umove(tcp, arg, &f)) {
 781                 tprints(", type=");
 782                 printxval(v4l2_frameinterval_types, f.type,
 783                           "V4L2_FRMIVAL_TYPE_???");
 784                 switch (f.type) {
 785                 case V4L2_FRMIVAL_TYPE_DISCRETE:
 786                         tprintf(", discrete=" FMT_FRACT,
 787                                 ARGS_FRACT(f.discrete));
 788                         break;
 789                 case V4L2_FRMIVAL_TYPE_STEPWISE:
 790                 case V4L2_FRMSIZE_TYPE_CONTINUOUS:
 791                         tprintf(", stepwise={min=" FMT_FRACT ", max="
 792                                 FMT_FRACT ", step=" FMT_FRACT "}",
 793                                 ARGS_FRACT(f.stepwise.min),
 794                                 ARGS_FRACT(f.stepwise.max),
 795                                 ARGS_FRACT(f.stepwise.step));
 796                         break;
 797                 }
 798         }
 799         tprints("}");
 800         return 1;
 801 }
 802 #endif /* VIDIOC_ENUM_FRAMEINTERVALS */
 803
 804 #ifdef VIDIOC_CREATE_BUFS
 805 static int
 806 print_v4l2_create_buffers(struct tcb *tcp, const long arg)
 807 {
 808         struct_v4l2_create_buffers b;
 809
 810         if (entering(tcp)) {
 811                 tprints(", ");
 812                 if (umove_or_printaddr(tcp, arg, &b))
 813                         return RVAL_DECODED | 1;
 814                 tprintf("{count=%u, memory=", b.count);
 815                 printxval(v4l2_memories, b.memory, "V4L2_MEMORY_???");
 816                 tprints(", format={type=");
 817                 printxval(v4l2_buf_types, b.format.type,
 818                           "V4L2_BUF_TYPE_???");
 819                 print_v4l2_format_fmt(", ",
 820                                       (struct_v4l2_format *) &b.format);
 821                 tprints("}}");
 822                 return 0;
 823         } else {
 824                 static const char fmt[] = "{index=%u, count=%u}";
 825                 static char outstr[sizeof(fmt) + sizeof(int) * 6];
 826
 827                 if (syserror(tcp) || umove(tcp, arg, &b) < 0)
 828                         return 1;
 829                 sprintf(outstr, fmt, b.index, b.count);
 830                 tcp->auxstr = outstr;
 831                 return 1 + RVAL_STR;
 832         }
 833 }
 834 #endif /* VIDIOC_CREATE_BUFS */
 835
 836 MPERS_PRINTER_DECL(int, v4l2_ioctl,
 837                    struct tcb *tcp, const unsigned int code, const long arg)
 838 {
 839         if (!verbose(tcp))
 840                 return RVAL_DECODED;
 841
 842         switch (code) {
 843         case VIDIOC_QUERYCAP: /* R */
 844                 return print_v4l2_capability(tcp, arg);
 845
 846         case VIDIOC_ENUM_FMT: /* RW */
 847                 return print_v4l2_fmtdesc(tcp, arg);
 848
 849         case VIDIOC_G_FMT: /* RW */
 850         case VIDIOC_S_FMT: /* RW */
 851         case VIDIOC_TRY_FMT: /* RW */
 852                 return print_v4l2_format(tcp, arg, code == VIDIOC_G_FMT);
 853
 854         case VIDIOC_REQBUFS: /* RW */
 855                 return print_v4l2_requestbuffers(tcp, arg);
 856
 857         case VIDIOC_QUERYBUF: /* RW */
 858         case VIDIOC_QBUF: /* RW */
 859         case VIDIOC_DQBUF: /* RW */
 860                 return print_v4l2_buffer(tcp, code, arg);
 861
 862         case VIDIOC_G_FBUF: /* R */
 863                 if (entering(tcp))
 864                         return 0;
 865                 /* fall through */
 866         case VIDIOC_S_FBUF: /* W */
 867                 return print_v4l2_framebuffer(tcp, arg);
 868
 869         case VIDIOC_STREAMON: /* W */
 870         case VIDIOC_STREAMOFF: /* W */
 871                 return print_v4l2_buf_type(tcp, arg);
 872
 873         case VIDIOC_G_PARM: /* RW */
 874         case VIDIOC_S_PARM: /* RW */
 875                 return print_v4l2_streamparm(tcp, arg, code == VIDIOC_G_PARM);
 876
 877         case VIDIOC_G_STD: /* R */
 878                 if (entering(tcp))
 879                         return 0;
 880                 /* fall through */
 881         case VIDIOC_S_STD: /* W */
 882                 tprints(", ");
 883                 printnum_int64(tcp, arg, "%#" PRIx64);
 884                 return RVAL_DECODED | 1;
 885
 886         case VIDIOC_ENUMSTD: /* RW */
 887                 return print_v4l2_standard(tcp, arg);
 888
 889         case VIDIOC_ENUMINPUT: /* RW */
 890                 return print_v4l2_input(tcp, arg);
 891
 892         case VIDIOC_G_CTRL: /* RW */
 893         case VIDIOC_S_CTRL: /* RW */
 894                 return print_v4l2_control(tcp, arg, code == VIDIOC_G_CTRL);
 895
 896         case VIDIOC_QUERYCTRL: /* RW */
 897                 return print_v4l2_queryctrl(tcp, arg);
 898
 899         case VIDIOC_G_INPUT: /* R */
 900                 if (entering(tcp))
 901                         return 0;
 902                 /* fall through */
 903         case VIDIOC_S_INPUT: /* RW */
 904                 tprints(", ");
 905                 printnum_int(tcp, arg, "%u");
 906                 return RVAL_DECODED | 1;
 907
 908         case VIDIOC_CROPCAP: /* RW */
 909                 return print_v4l2_cropcap(tcp, arg);
 910
 911         case VIDIOC_G_CROP: /* RW */
 912         case VIDIOC_S_CROP: /* W */
 913                 return print_v4l2_crop(tcp, arg, code == VIDIOC_G_CROP);
 914
 915 #ifdef VIDIOC_S_EXT_CTRLS
 916         case VIDIOC_S_EXT_CTRLS: /* RW */
 917         case VIDIOC_TRY_EXT_CTRLS: /* RW */
 918         case VIDIOC_G_EXT_CTRLS: /* RW */
 919                 return print_v4l2_ext_controls(tcp, arg,
 920                                                code == VIDIOC_G_EXT_CTRLS);
 921 #endif /* VIDIOC_S_EXT_CTRLS */
 922
 923 #ifdef VIDIOC_ENUM_FRAMESIZES
 924         case VIDIOC_ENUM_FRAMESIZES: /* RW */
 925                 return print_v4l2_frmsizeenum(tcp, arg);
 926 #endif /* VIDIOC_ENUM_FRAMESIZES */
 927
 928 #ifdef VIDIOC_ENUM_FRAMEINTERVALS
 929         case VIDIOC_ENUM_FRAMEINTERVALS: /* RW */
 930                 return print_v4l2_frmivalenum(tcp, arg);
 931 #endif /* VIDIOC_ENUM_FRAMEINTERVALS */
 932
 933 #ifdef VIDIOC_CREATE_BUFS
 934         case VIDIOC_CREATE_BUFS: /* RW */
 935                 return print_v4l2_create_buffers(tcp, arg);
 936 #endif /* VIDIOC_CREATE_BUFS */
 937
 938         default:
 939                 return RVAL_DECODED;
 940         }
 941 }