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 *const tcp, const kernel_ulong_t 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 *const tcp, const kernel_ulong_t 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 *const tcp, const kernel_ulong_t arg,
 287                   const bool is_get)
 288 {
 289         struct_v4l2_format f;
 290
 291         if (entering(tcp)) {
 292                 tprints(", ");
 293                 if (umove_or_printaddr(tcp, arg, &f))
 294                         return RVAL_DECODED | 1;
 295                 tprints("{type=");
 296                 printxval(v4l2_buf_types, f.type, "V4L2_BUF_TYPE_???");
 297                 if (is_get)
 298                         return 0;
 299                 print_v4l2_format_fmt(", ", &f);
 300         } else {
 301                 if (!syserror(tcp) && !umove(tcp, arg, &f)) {
 302                         const char *delim = is_get ? ", " : " => ";
 303                         print_v4l2_format_fmt(delim, &f);
 304                 }
 305                 tprints("}");
 306         }
 307         return 1;
 308 }
 309
 310 #include "xlat/v4l2_memories.h"
 311
 312 static int
 313 print_v4l2_requestbuffers(struct tcb *const tcp, const kernel_ulong_t arg)
 314 {
 315         struct v4l2_requestbuffers reqbufs;
 316
 317         if (entering(tcp)) {
 318                 tprints(", ");
 319                 if (umove_or_printaddr(tcp, arg, &reqbufs))
 320                         return RVAL_DECODED | 1;
 321                 tprintf("{count=%u, type=", reqbufs.count);
 322                 printxval(v4l2_buf_types, reqbufs.type, "V4L2_BUF_TYPE_???");
 323                 tprints(", memory=");
 324                 printxval(v4l2_memories, reqbufs.memory, "V4L2_MEMORY_???");
 325                 tprints("}");
 326                 return 0;
 327         } else {
 328                 static char outstr[sizeof("{count=}") + sizeof(int) * 3];
 329
 330                 if (syserror(tcp) || umove(tcp, arg, &reqbufs) < 0)
 331                         return 1;
 332                 sprintf(outstr, "{count=%u}", reqbufs.count);
 333                 tcp->auxstr = outstr;
 334                 return 1 + RVAL_STR;
 335         }
 336 }
 337
 338 #include "xlat/v4l2_buf_flags.h"
 339
 340 static int
 341 print_v4l2_buffer(struct tcb *const tcp, const unsigned int code,
 342                   const kernel_ulong_t arg)
 343 {
 344         struct_v4l2_buffer b;
 345
 346         if (entering(tcp)) {
 347                 tprints(", ");
 348                 if (umove_or_printaddr(tcp, arg, &b))
 349                         return RVAL_DECODED | 1;
 350                 tprints("{type=");
 351                 printxval(v4l2_buf_types, b.type, "V4L2_BUF_TYPE_???");
 352                 if (code != VIDIOC_DQBUF)
 353                         tprintf(", index=%u", b.index);
 354         } else {
 355                 if (!syserror(tcp) && umove(tcp, arg, &b) == 0) {
 356                         if (code == VIDIOC_DQBUF)
 357                                 tprintf(", index=%u", b.index);
 358                         tprints(", memory=");
 359                         printxval(v4l2_memories, b.memory, "V4L2_MEMORY_???");
 360
 361                         if (b.memory == V4L2_MEMORY_MMAP) {
 362                                 tprintf(", m.offset=%#x", b.m.offset);
 363                         } else if (b.memory == V4L2_MEMORY_USERPTR) {
 364                                 tprints(", m.userptr=");
 365                                 printaddr(b.m.userptr);
 366                         }
 367
 368                         tprintf(", length=%u, bytesused=%u, flags=",
 369                                 b.length, b.bytesused);
 370                         printflags(v4l2_buf_flags, b.flags, "V4L2_BUF_FLAG_???");
 371                         if (code == VIDIOC_DQBUF) {
 372                                 tprints(", timestamp = ");
 373                                 MPERS_FUNC_NAME(print_struct_timeval)(&b.timestamp);
 374                         }
 375                         tprints(", ...");
 376                 }
 377                 tprints("}");
 378         }
 379         return 1;
 380 }
 381
 382 static int
 383 print_v4l2_framebuffer(struct tcb *const tcp, const kernel_ulong_t arg)
 384 {
 385         struct_v4l2_framebuffer b;
 386
 387         tprints(", ");
 388         if (!umove_or_printaddr(tcp, arg, &b)) {
 389                 tprintf("{capability=%#x, flags=%#x, base=",
 390                         b.capability, b.flags);
 391                 printaddr(ptr_to_kulong(b.base));
 392                 tprints("}");
 393         }
 394
 395         return RVAL_DECODED | 1;
 396 }
 397
 398 static int
 399 print_v4l2_buf_type(struct tcb *const tcp, const kernel_ulong_t arg)
 400 {
 401         int type;
 402
 403         tprints(", ");
 404         if (!umove_or_printaddr(tcp, arg, &type)) {
 405                 tprints("[");
 406                 printxval(v4l2_buf_types, type, "V4L2_BUF_TYPE_???");
 407                 tprints("]");
 408         }
 409         return RVAL_DECODED | 1;
 410 }
 411
 412 #include "xlat/v4l2_streaming_capabilities.h"
 413 #include "xlat/v4l2_capture_modes.h"
 414
 415 static int
 416 print_v4l2_streamparm(struct tcb *const tcp, const kernel_ulong_t arg,
 417                       const bool is_get)
 418 {
 419         struct v4l2_streamparm s;
 420
 421         if (entering(tcp)) {
 422                 tprints(", ");
 423                 if (umove_or_printaddr(tcp, arg, &s))
 424                         return RVAL_DECODED | 1;
 425                 tprints("{type=");
 426                 printxval(v4l2_buf_types, s.type, "V4L2_BUF_TYPE_???");
 427                 switch (s.type) {
 428                         case V4L2_BUF_TYPE_VIDEO_CAPTURE:
 429                         case V4L2_BUF_TYPE_VIDEO_OUTPUT:
 430                                 if (is_get)
 431                                         return 0;
 432                                 tprints(", ");
 433                                 break;
 434                         default:
 435                                 tprints("}");
 436                                 return RVAL_DECODED | 1;
 437                 }
 438         } else {
 439                 if (syserror(tcp) || umove(tcp, arg, &s) < 0) {
 440                         tprints("}");
 441                         return 1;
 442                 }
 443                 tprints(is_get ? ", " : " => ");
 444         }
 445
 446         if (s.type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
 447                 tprints("parm.capture={capability=");
 448                 printflags(v4l2_streaming_capabilities,
 449                            s.parm.capture.capability, "V4L2_CAP_???");
 450
 451                 tprints(", capturemode=");
 452                 printflags(v4l2_capture_modes,
 453                            s.parm.capture.capturemode, "V4L2_MODE_???");
 454
 455                 tprintf(", timeperframe=" FMT_FRACT,
 456                         ARGS_FRACT(s.parm.capture.timeperframe));
 457
 458                 tprintf(", extendedmode=%u, readbuffers=%u}",
 459                         s.parm.capture.extendedmode,
 460                         s.parm.capture.readbuffers);
 461         } else {
 462                 tprints("parm.output={capability=");
 463                 printflags(v4l2_streaming_capabilities,
 464                            s.parm.output.capability, "V4L2_CAP_???");
 465
 466                 tprintf(", outputmode=%u", s.parm.output.outputmode);
 467
 468                 tprintf(", timeperframe=" FMT_FRACT,
 469                         ARGS_FRACT(s.parm.output.timeperframe));
 470
 471                 tprintf(", extendedmode=%u, writebuffers=%u}",
 472                         s.parm.output.extendedmode,
 473                         s.parm.output.writebuffers);
 474         }
 475         if (exiting(tcp))
 476                 tprints("}");
 477         return 1;
 478 }
 479
 480 static int
 481 print_v4l2_standard(struct tcb *const tcp, const kernel_ulong_t arg)
 482 {
 483         struct_v4l2_standard s;
 484
 485         if (entering(tcp)) {
 486                 tprints(", ");
 487                 if (umove_or_printaddr(tcp, arg, &s))
 488                         return RVAL_DECODED | 1;
 489                 tprintf("{index=%u", s.index);
 490         } else {
 491                 if (!syserror(tcp) && !umove(tcp, arg, &s)) {
 492                         tprints(", name=");
 493                         print_quoted_string((const char *) s.name,
 494                                             sizeof(s.name),
 495                                             QUOTE_0_TERMINATED);
 496                         tprintf(", frameperiod=" FMT_FRACT,
 497                                 ARGS_FRACT(s.frameperiod));
 498                         tprintf(", framelines=%d", s.framelines);
 499                 }
 500                 tprints("}");
 501         }
 502         return 1;
 503 }
 504
 505 #include "xlat/v4l2_input_types.h"
 506
 507 static int
 508 print_v4l2_input(struct tcb *const tcp, const kernel_ulong_t arg)
 509 {
 510         struct_v4l2_input i;
 511
 512         if (entering(tcp)) {
 513                 tprints(", ");
 514                 if (umove_or_printaddr(tcp, arg, &i))
 515                         return RVAL_DECODED | 1;
 516                 tprintf("{index=%u", i.index);
 517         } else {
 518                 if (!syserror(tcp) && !umove(tcp, arg, &i)) {
 519                         tprints(", name=");
 520                         print_quoted_string((const char *) i.name,
 521                                             sizeof(i.name),
 522                                             QUOTE_0_TERMINATED);
 523                         tprints(", type=");
 524                         printxval(v4l2_input_types, i.type,
 525                                   "V4L2_INPUT_TYPE_???");
 526                 }
 527                 tprints("}");
 528         }
 529         return 1;
 530 }
 531
 532 #include "xlat/v4l2_control_ids.h"
 533
 534 static int
 535 print_v4l2_control(struct tcb *const tcp, const kernel_ulong_t arg,
 536                    const bool is_get)
 537 {
 538         struct v4l2_control c;
 539
 540         if (entering(tcp)) {
 541                 tprints(", ");
 542                 if (umove_or_printaddr(tcp, arg, &c))
 543                         return RVAL_DECODED | 1;
 544                 tprints("{id=");
 545                 printxval(v4l2_control_ids, c.id, "V4L2_CID_???");
 546                 if (!is_get)
 547                         tprintf(", value=%d", c.value);
 548                 return 0;
 549         }
 550
 551         if (!syserror(tcp) && !umove(tcp, arg, &c)) {
 552                 tprints(is_get ? ", " : " => ");
 553                 tprintf("value=%d", c.value);
 554         }
 555
 556         tprints("}");
 557         return 1;
 558 }
 559
 560 #include "xlat/v4l2_control_types.h"
 561 #include "xlat/v4l2_control_flags.h"
 562
 563 static int
 564 print_v4l2_queryctrl(struct tcb *const tcp, const kernel_ulong_t arg)
 565 {
 566         struct v4l2_queryctrl c;
 567
 568         if (entering(tcp)) {
 569                 tprints(", ");
 570                 if (umove_or_printaddr(tcp, arg, &c))
 571                         return RVAL_DECODED | 1;
 572                 tprints("{id=");
 573         } else {
 574                 if (syserror(tcp) || umove(tcp, arg, &c) < 0) {
 575                         tprints("}");
 576                         return 1;
 577                 }
 578                 if (get_tcb_priv_ulong(tcp))
 579                         tprints(" => ");
 580         }
 581
 582         if (entering(tcp) || get_tcb_priv_ulong(tcp)) {
 583 #ifdef V4L2_CTRL_FLAG_NEXT_CTRL
 584                 const unsigned long next = c.id & V4L2_CTRL_FLAG_NEXT_CTRL;
 585                 set_tcb_priv_ulong(tcp, next);
 586                 if (next) {
 587                         tprints("V4L2_CTRL_FLAG_NEXT_CTRL|");
 588                         c.id &= ~V4L2_CTRL_FLAG_NEXT_CTRL;
 589                 }
 590 #endif
 591                 printxval(v4l2_control_ids, c.id, "V4L2_CID_???");
 592         }
 593
 594         if (exiting(tcp)) {
 595                 tprints(", type=");
 596                 printxval(v4l2_control_types, c.type, "V4L2_CTRL_TYPE_???");
 597                 tprints(", name=");
 598                 print_quoted_string((const char *) c.name,
 599                                     sizeof(c.name),
 600                                     QUOTE_0_TERMINATED);
 601                 tprintf(", minimum=%d, maximum=%d, step=%d"
 602                         ", default_value=%d, flags=",
 603                         c.minimum, c.maximum, c.step, c.default_value);
 604                 printflags(v4l2_control_flags, c.flags, "V4L2_CTRL_FLAG_???");
 605                 tprints("}");
 606         }
 607         return 1;
 608 }
 609
 610 static int
 611 print_v4l2_cropcap(struct tcb *const tcp, const kernel_ulong_t arg)
 612 {
 613         struct v4l2_cropcap c;
 614
 615         if (entering(tcp)) {
 616                 tprints(", ");
 617                 if (umove_or_printaddr(tcp, arg, &c))
 618                         return RVAL_DECODED | 1;
 619                 tprints("{type=");
 620                 printxval(v4l2_buf_types, c.type, "V4L2_BUF_TYPE_???");
 621                 return 0;
 622         }
 623         if (!syserror(tcp) && !umove(tcp, arg, &c)) {
 624                 tprintf(", bounds=" FMT_RECT
 625                         ", defrect=" FMT_RECT
 626                         ", pixelaspect=" FMT_FRACT,
 627                         ARGS_RECT(c.bounds),
 628                         ARGS_RECT(c.defrect),
 629                         ARGS_FRACT(c.pixelaspect));
 630         }
 631         tprints("}");
 632         return 1;
 633 }
 634
 635 static int
 636 print_v4l2_crop(struct tcb *const tcp, const kernel_ulong_t arg,
 637                 const bool is_get)
 638 {
 639         struct v4l2_crop c;
 640
 641         if (entering(tcp)) {
 642                 tprints(", ");
 643                 if (umove_or_printaddr(tcp, arg, &c))
 644                         return RVAL_DECODED | 1;
 645                 tprints("{type=");
 646                 printxval(v4l2_buf_types, c.type, "V4L2_BUF_TYPE_???");
 647                 if (is_get)
 648                         return 0;
 649                 tprintf(", c=" FMT_RECT, ARGS_RECT(c.c));
 650         } else {
 651                 if (!syserror(tcp) && !umove(tcp, arg, &c))
 652                         tprintf(", c=" FMT_RECT, ARGS_RECT(c.c));
 653         }
 654
 655         tprints("}");
 656         return RVAL_DECODED | 1;
 657 }
 658
 659 #ifdef VIDIOC_S_EXT_CTRLS
 660 static bool
 661 print_v4l2_ext_control(struct tcb *tcp, void *elem_buf, size_t elem_size, void *data)
 662 {
 663         const struct_v4l2_ext_control *p = elem_buf;
 664
 665         tprints("{id=");
 666         printxval(v4l2_control_ids, p->id, "V4L2_CID_???");
 667 # if HAVE_DECL_V4L2_CTRL_TYPE_STRING
 668         tprintf(", size=%u", p->size);
 669         if (p->size > 0) {
 670                 tprints(", string=");
 671                 printstrn(tcp, ptr_to_kulong(p->string), p->size);
 672         } else
 673 # endif
 674         tprintf(", value=%d, value64=%" PRId64, p->value, (int64_t) p->value64);
 675         tprints("}");
 676
 677         return true;
 678 }
 679
 680 #include "xlat/v4l2_control_classes.h"
 681
 682 static int
 683 print_v4l2_ext_controls(struct tcb *const tcp, const kernel_ulong_t arg,
 684                         const bool is_get)
 685 {
 686         struct_v4l2_ext_controls c;
 687
 688         if (entering(tcp)) {
 689                 tprints(", ");
 690                 if (umove_or_printaddr(tcp, arg, &c))
 691                         return RVAL_DECODED | 1;
 692                 tprints("{ctrl_class=");
 693                 printxval(v4l2_control_classes, c.ctrl_class,
 694                           "V4L2_CTRL_CLASS_???");
 695                 tprintf(", count=%u", c.count);
 696                 if (!c.count) {
 697                         tprints("}");
 698                         return RVAL_DECODED | 1;
 699                 }
 700                 if (is_get)
 701                         return 0;
 702                 tprints(", ");
 703         } else {
 704                 if (umove(tcp, arg, &c) < 0) {
 705                         tprints("}");
 706                         return 1;
 707                 }
 708                 tprints(is_get ? ", " : " => ");
 709         }
 710
 711         tprints("controls=");
 712         struct_v4l2_ext_control ctrl;
 713         bool fail = !print_array(tcp, ptr_to_kulong(c.controls), c.count,
 714                                  &ctrl, sizeof(ctrl),
 715                                  umoven_or_printaddr_ignore_syserror,
 716                                  print_v4l2_ext_control, 0);
 717
 718         if (exiting(tcp) && syserror(tcp))
 719                 tprintf(", error_idx=%u", c.error_idx);
 720
 721         if (exiting(tcp) || fail) {
 722                 tprints("}");
 723                 return RVAL_DECODED | 1;
 724         }
 725         return 1;
 726 }
 727 #endif /* VIDIOC_S_EXT_CTRLS */
 728
 729 #ifdef VIDIOC_ENUM_FRAMESIZES
 730 # include "xlat/v4l2_framesize_types.h"
 731
 732 static int
 733 print_v4l2_frmsizeenum(struct tcb *const tcp, const kernel_ulong_t arg)
 734 {
 735         struct v4l2_frmsizeenum s;
 736
 737         if (entering(tcp)) {
 738                 tprints(", ");
 739                 if (umove_or_printaddr(tcp, arg, &s))
 740                         return RVAL_DECODED | 1;
 741                 tprintf("{index=%u, pixel_format=", s.index);
 742                 print_pixelformat(s.pixel_format);
 743                 return 0;
 744         }
 745
 746         if (!syserror(tcp) && !umove(tcp, arg, &s)) {
 747                 tprints(", type=");
 748                 printxval(v4l2_framesize_types, s.type, "V4L2_FRMSIZE_TYPE_???");
 749                 switch (s.type) {
 750                 case V4L2_FRMSIZE_TYPE_DISCRETE:
 751                         tprintf(", discrete={width=%u, height=%u}",
 752                                 s.discrete.width, s.discrete.height);
 753                         break;
 754                 case V4L2_FRMSIZE_TYPE_STEPWISE:
 755                         tprintf(", stepwise={min_width=%u, max_width=%u, "
 756                                 "step_width=%u, min_height=%u, max_height=%u, "
 757                                 "step_height=%u}",
 758                                 s.stepwise.min_width, s.stepwise.max_width,
 759                                 s.stepwise.step_width, s.stepwise.min_height,
 760                                 s.stepwise.max_height, s.stepwise.step_height);
 761                         break;
 762                 }
 763         }
 764         tprints("}");
 765         return 1;
 766 }
 767 #endif /* VIDIOC_ENUM_FRAMESIZES */
 768
 769 #ifdef VIDIOC_ENUM_FRAMEINTERVALS
 770 # include "xlat/v4l2_frameinterval_types.h"
 771
 772 static int
 773 print_v4l2_frmivalenum(struct tcb *const tcp, const kernel_ulong_t arg)
 774 {
 775         struct v4l2_frmivalenum f;
 776
 777         if (entering(tcp)) {
 778                 tprints(", ");
 779                 if (umove_or_printaddr(tcp, arg, &f))
 780                         return RVAL_DECODED | 1;
 781                 tprintf("{index=%u, pixel_format=", f.index);
 782                 print_pixelformat(f.pixel_format);
 783                 tprintf(", width=%u, height=%u", f.width, f.height);
 784                 return 0;
 785         }
 786         if (!syserror(tcp) && !umove(tcp, arg, &f)) {
 787                 tprints(", type=");
 788                 printxval(v4l2_frameinterval_types, f.type,
 789                           "V4L2_FRMIVAL_TYPE_???");
 790                 switch (f.type) {
 791                 case V4L2_FRMIVAL_TYPE_DISCRETE:
 792                         tprintf(", discrete=" FMT_FRACT,
 793                                 ARGS_FRACT(f.discrete));
 794                         break;
 795                 case V4L2_FRMIVAL_TYPE_STEPWISE:
 796                 case V4L2_FRMSIZE_TYPE_CONTINUOUS:
 797                         tprintf(", stepwise={min=" FMT_FRACT ", max="
 798                                 FMT_FRACT ", step=" FMT_FRACT "}",
 799                                 ARGS_FRACT(f.stepwise.min),
 800                                 ARGS_FRACT(f.stepwise.max),
 801                                 ARGS_FRACT(f.stepwise.step));
 802                         break;
 803                 }
 804         }
 805         tprints("}");
 806         return 1;
 807 }
 808 #endif /* VIDIOC_ENUM_FRAMEINTERVALS */
 809
 810 #ifdef VIDIOC_CREATE_BUFS
 811 static int
 812 print_v4l2_create_buffers(struct tcb *const tcp, const kernel_ulong_t arg)
 813 {
 814         struct_v4l2_create_buffers b;
 815
 816         if (entering(tcp)) {
 817                 tprints(", ");
 818                 if (umove_or_printaddr(tcp, arg, &b))
 819                         return RVAL_DECODED | 1;
 820                 tprintf("{count=%u, memory=", b.count);
 821                 printxval(v4l2_memories, b.memory, "V4L2_MEMORY_???");
 822                 tprints(", format={type=");
 823                 printxval(v4l2_buf_types, b.format.type,
 824                           "V4L2_BUF_TYPE_???");
 825                 print_v4l2_format_fmt(", ",
 826                                       (struct_v4l2_format *) &b.format);
 827                 tprints("}}");
 828                 return 0;
 829         } else {
 830                 static const char fmt[] = "{index=%u, count=%u}";
 831                 static char outstr[sizeof(fmt) + sizeof(int) * 6];
 832
 833                 if (syserror(tcp) || umove(tcp, arg, &b) < 0)
 834                         return 1;
 835                 sprintf(outstr, fmt, b.index, b.count);
 836                 tcp->auxstr = outstr;
 837                 return 1 + RVAL_STR;
 838         }
 839 }
 840 #endif /* VIDIOC_CREATE_BUFS */
 841
 842 MPERS_PRINTER_DECL(int, v4l2_ioctl, struct tcb *const tcp,
 843                    const unsigned int code, const kernel_ulong_t arg)
 844 {
 845         if (!verbose(tcp))
 846                 return RVAL_DECODED;
 847
 848         switch (code) {
 849         case VIDIOC_QUERYCAP: /* R */
 850                 return print_v4l2_capability(tcp, arg);
 851
 852         case VIDIOC_ENUM_FMT: /* RW */
 853                 return print_v4l2_fmtdesc(tcp, arg);
 854
 855         case VIDIOC_G_FMT: /* RW */
 856         case VIDIOC_S_FMT: /* RW */
 857         case VIDIOC_TRY_FMT: /* RW */
 858                 return print_v4l2_format(tcp, arg, code == VIDIOC_G_FMT);
 859
 860         case VIDIOC_REQBUFS: /* RW */
 861                 return print_v4l2_requestbuffers(tcp, arg);
 862
 863         case VIDIOC_QUERYBUF: /* RW */
 864         case VIDIOC_QBUF: /* RW */
 865         case VIDIOC_DQBUF: /* RW */
 866                 return print_v4l2_buffer(tcp, code, arg);
 867
 868         case VIDIOC_G_FBUF: /* R */
 869                 if (entering(tcp))
 870                         return 0;
 871                 /* fall through */
 872         case VIDIOC_S_FBUF: /* W */
 873                 return print_v4l2_framebuffer(tcp, arg);
 874
 875         case VIDIOC_STREAMON: /* W */
 876         case VIDIOC_STREAMOFF: /* W */
 877                 return print_v4l2_buf_type(tcp, arg);
 878
 879         case VIDIOC_G_PARM: /* RW */
 880         case VIDIOC_S_PARM: /* RW */
 881                 return print_v4l2_streamparm(tcp, arg, code == VIDIOC_G_PARM);
 882
 883         case VIDIOC_G_STD: /* R */
 884                 if (entering(tcp))
 885                         return 0;
 886                 /* fall through */
 887         case VIDIOC_S_STD: /* W */
 888                 tprints(", ");
 889                 printnum_int64(tcp, arg, "%#" PRIx64);
 890                 return RVAL_DECODED | 1;
 891
 892         case VIDIOC_ENUMSTD: /* RW */
 893                 return print_v4l2_standard(tcp, arg);
 894
 895         case VIDIOC_ENUMINPUT: /* RW */
 896                 return print_v4l2_input(tcp, arg);
 897
 898         case VIDIOC_G_CTRL: /* RW */
 899         case VIDIOC_S_CTRL: /* RW */
 900                 return print_v4l2_control(tcp, arg, code == VIDIOC_G_CTRL);
 901
 902         case VIDIOC_QUERYCTRL: /* RW */
 903                 return print_v4l2_queryctrl(tcp, arg);
 904
 905         case VIDIOC_G_INPUT: /* R */
 906                 if (entering(tcp))
 907                         return 0;
 908                 /* fall through */
 909         case VIDIOC_S_INPUT: /* RW */
 910                 tprints(", ");
 911                 printnum_int(tcp, arg, "%u");
 912                 return RVAL_DECODED | 1;
 913
 914         case VIDIOC_CROPCAP: /* RW */
 915                 return print_v4l2_cropcap(tcp, arg);
 916
 917         case VIDIOC_G_CROP: /* RW */
 918         case VIDIOC_S_CROP: /* W */
 919                 return print_v4l2_crop(tcp, arg, code == VIDIOC_G_CROP);
 920
 921 #ifdef VIDIOC_S_EXT_CTRLS
 922         case VIDIOC_S_EXT_CTRLS: /* RW */
 923         case VIDIOC_TRY_EXT_CTRLS: /* RW */
 924         case VIDIOC_G_EXT_CTRLS: /* RW */
 925                 return print_v4l2_ext_controls(tcp, arg,
 926                                                code == VIDIOC_G_EXT_CTRLS);
 927 #endif /* VIDIOC_S_EXT_CTRLS */
 928
 929 #ifdef VIDIOC_ENUM_FRAMESIZES
 930         case VIDIOC_ENUM_FRAMESIZES: /* RW */
 931                 return print_v4l2_frmsizeenum(tcp, arg);
 932 #endif /* VIDIOC_ENUM_FRAMESIZES */
 933
 934 #ifdef VIDIOC_ENUM_FRAMEINTERVALS
 935         case VIDIOC_ENUM_FRAMEINTERVALS: /* RW */
 936                 return print_v4l2_frmivalenum(tcp, arg);
 937 #endif /* VIDIOC_ENUM_FRAMEINTERVALS */
 938
 939 #ifdef VIDIOC_CREATE_BUFS
 940         case VIDIOC_CREATE_BUFS: /* RW */
 941                 return print_v4l2_create_buffers(tcp, arg);
 942 #endif /* VIDIOC_CREATE_BUFS */
 943
 944         default:
 945                 return RVAL_DECODED;
 946         }
 947 }