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  * Copyright (c) 2014-2019 The strace developers.
   6  * All rights reserved.
   7  *
   8  * SPDX-License-Identifier: LGPL-2.1-or-later
   9  */
  10
  11 #include "defs.h"
  12
  13 #include <stdint.h>
  14 #include <linux/ioctl.h>
  15 #include <linux/types.h>
  16 #include <linux/videodev2.h>
  17
  18 #include DEF_MPERS_TYPE(struct_v4l2_buffer)
  19 #include DEF_MPERS_TYPE(struct_v4l2_clip)
  20 #ifdef VIDIOC_CREATE_BUFS
  21 # include DEF_MPERS_TYPE(struct_v4l2_create_buffers)
  22 #endif
  23 #include DEF_MPERS_TYPE(struct_v4l2_ext_control)
  24 #include DEF_MPERS_TYPE(struct_v4l2_ext_controls)
  25 #include DEF_MPERS_TYPE(struct_v4l2_format)
  26 #include DEF_MPERS_TYPE(struct_v4l2_framebuffer)
  27 #include DEF_MPERS_TYPE(struct_v4l2_input)
  28 #include DEF_MPERS_TYPE(struct_v4l2_standard)
  29
  30 typedef struct v4l2_buffer struct_v4l2_buffer;
  31 typedef struct v4l2_clip struct_v4l2_clip;
  32 #ifdef VIDIOC_CREATE_BUFS
  33 typedef struct v4l2_create_buffers struct_v4l2_create_buffers;
  34 #endif
  35 typedef struct v4l2_ext_control struct_v4l2_ext_control;
  36 typedef struct v4l2_ext_controls struct_v4l2_ext_controls;
  37 typedef struct v4l2_format struct_v4l2_format;
  38 typedef struct v4l2_framebuffer struct_v4l2_framebuffer;
  39 typedef struct v4l2_input struct_v4l2_input;
  40 typedef struct v4l2_standard struct_v4l2_standard;
  41
  42 #include MPERS_DEFS
  43
  44 #include "print_fields.h"
  45 #include "print_utils.h"
  46 #include "xstring.h"
  47
  48 /* v4l2_fourcc_be was added by Linux commit v3.18-rc1~101^2^2~127 */
  49 #ifndef v4l2_fourcc_be
  50 # define v4l2_fourcc_be(a, b, c, d) (v4l2_fourcc(a, b, c, d) | (1 << 31))
  51 #endif
  52
  53 #define FMT_FRACT "%u/%u"
  54 #define ARGS_FRACT(x) ((x).numerator), ((x).denominator)
  55
  56 #define FMT_RECT "{left=%d, top=%d, width=%u, height=%u}"
  57 #define ARGS_RECT(x) (x).left, (x).top, (x).width, (x).height
  58
  59 #include "xlat/v4l2_pix_fmts.h"
  60 #include "xlat/v4l2_sdr_fmts.h"
  61
  62 static void
  63 print_pixelformat(uint32_t fourcc, const struct xlat *xlat)
  64 {
  65         unsigned char a[] = {
  66                 (unsigned char) fourcc,
  67                 (unsigned char) (fourcc >> 8),
  68                 (unsigned char) (fourcc >> 16),
  69                 (unsigned char) (fourcc >> 24),
  70         };
  71         unsigned int i;
  72
  73         tprints("v4l2_fourcc(");
  74         /* Generic char array printing routine.  */
  75         for (i = 0; i < ARRAY_SIZE(a); ++i) {
  76                 unsigned char c = a[i];
  77
  78                 if (i)
  79                         tprints(", ");
  80                 if (c == '\'' || c == '\\') {
  81                         char sym[] = {
  82                                 '\'',
  83                                 '\\',
  84                                 c,
  85                                 '\'',
  86                                 '\0'
  87                         };
  88                         tprints(sym);
  89                 } else if (is_print(c)) {
  90                         char sym[] = {
  91                                 '\'',
  92                                 c,
  93                                 '\'',
  94                                 '\0'
  95                         };
  96                         tprints(sym);
  97                 } else {
  98                         char hex[] = {
  99                                 BYTE_HEX_CHARS_PRINTF_QUOTED(c),
 100                                 '\0'
 101                         };
 102                         tprints(hex);
 103                 }
 104         }
 105         tprints(")");
 106
 107         if (xlat) {
 108                 const char *pixfmt_name = xlookup(xlat, fourcc);
 109
 110                 if (pixfmt_name)
 111                         tprints_comment(pixfmt_name);
 112         }
 113 }
 114
 115 #include "xlat/v4l2_device_capabilities_flags.h"
 116
 117 static int
 118 print_v4l2_capability(struct tcb *const tcp, const kernel_ulong_t arg)
 119 {
 120         struct v4l2_capability caps;
 121
 122         if (entering(tcp))
 123                 return 0;
 124         tprints(", ");
 125         if (umove_or_printaddr(tcp, arg, &caps))
 126                 return RVAL_IOCTL_DECODED;
 127         PRINT_FIELD_CSTRING("{", caps, driver);
 128         PRINT_FIELD_CSTRING(", ", caps, card);
 129         PRINT_FIELD_CSTRING(", ", caps, bus_info);
 130         tprintf(", version=%u.%u.%u, capabilities=",
 131                 (caps.version >> 16) & 0xFF,
 132                 (caps.version >> 8) & 0xFF,
 133                 caps.version & 0xFF);
 134         printflags(v4l2_device_capabilities_flags, caps.capabilities,
 135                    "V4L2_CAP_???");
 136 #ifdef V4L2_CAP_DEVICE_CAPS
 137         tprints(", device_caps=");
 138         printflags(v4l2_device_capabilities_flags, caps.device_caps,
 139                    "V4L2_CAP_???");
 140 #endif
 141         tprints("}");
 142         return RVAL_IOCTL_DECODED;
 143 }
 144
 145 #include "xlat/v4l2_buf_types.h"
 146 #include "xlat/v4l2_format_description_flags.h"
 147
 148 static int
 149 print_v4l2_fmtdesc(struct tcb *const tcp, const kernel_ulong_t arg)
 150 {
 151         struct v4l2_fmtdesc f;
 152
 153         if (entering(tcp)) {
 154                 tprints(", ");
 155                 if (umove_or_printaddr(tcp, arg, &f))
 156                         return RVAL_IOCTL_DECODED;
 157                 tprintf("{index=%u, type=", f.index);
 158                 printxval(v4l2_buf_types, f.type, "V4L2_BUF_TYPE_???");
 159                 return 0;
 160         }
 161
 162         if (!syserror(tcp) && !umove(tcp, arg, &f)) {
 163                 tprints(", flags=");
 164                 printflags(v4l2_format_description_flags, f.flags,
 165                            "V4L2_FMT_FLAG_???");
 166                 PRINT_FIELD_CSTRING(", ", f, description);
 167                 tprints(", pixelformat=");
 168                 print_pixelformat(f.pixelformat, v4l2_pix_fmts);
 169         }
 170         tprints("}");
 171         return RVAL_IOCTL_DECODED;
 172 }
 173
 174 #include "xlat/v4l2_fields.h"
 175 #include "xlat/v4l2_colorspaces.h"
 176 #include "xlat/v4l2_vbi_flags.h"
 177 #include "xlat/v4l2_sliced_flags.h"
 178
 179 static bool
 180 print_v4l2_clip(struct tcb *tcp, void *elem_buf, size_t elem_size, void *data)
 181 {
 182         const struct_v4l2_clip *p = elem_buf;
 183         tprintf(FMT_RECT, ARGS_RECT(p->c));
 184         return true;
 185 }
 186
 187 static bool
 188 print_v4l2_format_fmt(struct tcb *const tcp, const char *prefix,
 189                       const struct_v4l2_format *f)
 190 {
 191         bool ret = true;
 192         switch (f->type) {
 193         case V4L2_BUF_TYPE_VIDEO_CAPTURE:
 194         case V4L2_BUF_TYPE_VIDEO_OUTPUT:
 195                 tprints(prefix);
 196                 tprintf("fmt.pix={width=%u, height=%u, pixelformat=",
 197                         f->fmt.pix.width, f->fmt.pix.height);
 198                 print_pixelformat(f->fmt.pix.pixelformat, v4l2_pix_fmts);
 199                 tprints(", field=");
 200                 printxval(v4l2_fields, f->fmt.pix.field, "V4L2_FIELD_???");
 201                 tprintf(", bytesperline=%u, sizeimage=%u, colorspace=",
 202                         f->fmt.pix.bytesperline, f->fmt.pix.sizeimage);
 203                 printxval(v4l2_colorspaces, f->fmt.pix.colorspace,
 204                           "V4L2_COLORSPACE_???");
 205                 tprints("}");
 206                 break;
 207 #if HAVE_DECL_V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE
 208         case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
 209         case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE: {
 210                 unsigned int i, max;
 211
 212                 tprints(prefix);
 213                 tprintf("fmt.pix_mp={width=%u, height=%u, pixelformat=",
 214                         f->fmt.pix_mp.width, f->fmt.pix_mp.height);
 215                 print_pixelformat(f->fmt.pix_mp.pixelformat, v4l2_pix_fmts);
 216                 tprints(", field=");
 217                 printxval(v4l2_fields, f->fmt.pix_mp.field, "V4L2_FIELD_???");
 218                 tprints(", colorspace=");
 219                 printxval(v4l2_colorspaces, f->fmt.pix_mp.colorspace,
 220                           "V4L2_COLORSPACE_???");
 221                 tprints(", plane_fmt=[");
 222                 max = f->fmt.pix_mp.num_planes;
 223                 if (max > VIDEO_MAX_PLANES)
 224                         max = VIDEO_MAX_PLANES;
 225                 for (i = 0; i < max; i++) {
 226                         if (i > 0)
 227                                 tprints(", ");
 228                         tprintf("{sizeimage=%u, bytesperline=%u}",
 229                                 f->fmt.pix_mp.plane_fmt[i].sizeimage,
 230                                 f->fmt.pix_mp.plane_fmt[i].bytesperline);
 231                 }
 232                 tprintf("], num_planes=%u}",
 233                         (unsigned) f->fmt.pix_mp.num_planes);
 234                 break;
 235         }
 236 #endif
 237         /* OUTPUT_OVERLAY since Linux v2.6.22-rc1~1118^2~179 */
 238 #if HAVE_DECL_V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY
 239         case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
 240 #endif
 241         case V4L2_BUF_TYPE_VIDEO_OVERLAY: {
 242                 struct_v4l2_clip clip;
 243                 tprints(prefix);
 244                 tprintf("fmt.win={left=%d, top=%d, width=%u, height=%u, field=",
 245                         ARGS_RECT(f->fmt.win.w));
 246                 printxval(v4l2_fields, f->fmt.win.field, "V4L2_FIELD_???");
 247                 tprintf(", chromakey=%#x, clips=", f->fmt.win.chromakey);
 248                 ret = print_array(tcp, ptr_to_kulong(f->fmt.win.clips),
 249                                   f->fmt.win.clipcount, &clip, sizeof(clip),
 250                                   tfetch_mem, print_v4l2_clip, 0);
 251                 tprintf(", clipcount=%u, bitmap=", f->fmt.win.clipcount);
 252                 printaddr(ptr_to_kulong(f->fmt.win.bitmap));
 253 #ifdef HAVE_STRUCT_V4L2_WINDOW_GLOBAL_ALPHA
 254                 tprintf(", global_alpha=%#x", f->fmt.win.global_alpha);
 255 #endif
 256                 tprints("}");
 257                 break;
 258         }
 259         case V4L2_BUF_TYPE_VBI_CAPTURE:
 260         case V4L2_BUF_TYPE_VBI_OUTPUT:
 261                 tprints(prefix);
 262                 tprintf("fmt.vbi={sampling_rate=%u, offset=%u, "
 263                         "samples_per_line=%u, sample_format=",
 264                         f->fmt.vbi.sampling_rate, f->fmt.vbi.offset,
 265                         f->fmt.vbi.samples_per_line);
 266                 print_pixelformat(f->fmt.vbi.sample_format, v4l2_pix_fmts);
 267                 tprintf(", start=[%u, %u], count=[%u, %u], ",
 268                         f->fmt.vbi.start[0], f->fmt.vbi.start[1],
 269                         f->fmt.vbi.count[0], f->fmt.vbi.count[1]);
 270                 tprints("flags=");
 271                 printxval(v4l2_vbi_flags, f->fmt.vbi.flags, "V4L2_VBI_???");
 272                 tprints("}");
 273                 break;
 274         /* both since Linux v2.6.14-rc2~64 */
 275 #if HAVE_DECL_V4L2_BUF_TYPE_SLICED_VBI_CAPTURE
 276         case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
 277         case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT: {
 278                 unsigned int i, j;
 279
 280                 tprints(prefix);
 281                 tprints("fmt.sliced={service_set=");
 282                 printxval(v4l2_sliced_flags, f->fmt.sliced.service_set,
 283                         "V4L2_SLICED_???");
 284                 tprintf(", io_size=%u, service_lines=[",
 285                         f->fmt.sliced.io_size);
 286                 for (i = 0; i < ARRAY_SIZE(f->fmt.sliced.service_lines); i++) {
 287                         if (i > 0)
 288                                 tprints(", ");
 289                         tprints("[");
 290                         for (j = 0;
 291                              j < ARRAY_SIZE(f->fmt.sliced.service_lines[0]);
 292                              j++) {
 293                                 if (j > 0)
 294                                         tprints(", ");
 295                                 tprintf("%#x",
 296                                         f->fmt.sliced.service_lines[i][j]);
 297                         }
 298                         tprints("]");
 299                 }
 300                 tprints("]}");
 301                 break;
 302         }
 303 #endif
 304         /* since Linux v4.4-rc1~118^2~14 */
 305 #if HAVE_DECL_V4L2_BUF_TYPE_SDR_OUTPUT
 306         case V4L2_BUF_TYPE_SDR_OUTPUT:
 307 #endif
 308         /* since Linux v3.15-rc1~85^2~213 */
 309 #if HAVE_DECL_V4L2_BUF_TYPE_SDR_CAPTURE
 310         case V4L2_BUF_TYPE_SDR_CAPTURE:
 311                 tprints(prefix);
 312                 tprints("fmt.sdr={pixelformat=");
 313                 print_pixelformat(f->fmt.sdr.pixelformat, v4l2_sdr_fmts);
 314 # ifdef HAVE_STRUCT_V4L2_SDR_FORMAT_BUFFERSIZE
 315                 tprintf(", buffersize=%u",
 316                         f->fmt.sdr.buffersize);
 317 # endif
 318                 tprints("}");
 319                 break;
 320 #endif
 321         }
 322         return ret;
 323 }
 324
 325 static int
 326 print_v4l2_format(struct tcb *const tcp, const kernel_ulong_t arg,
 327                   const bool is_get)
 328 {
 329         struct_v4l2_format f;
 330
 331         if (entering(tcp)) {
 332                 tprints(", ");
 333                 if (umove_or_printaddr(tcp, arg, &f))
 334                         return RVAL_IOCTL_DECODED;
 335                 tprints("{type=");
 336                 printxval(v4l2_buf_types, f.type, "V4L2_BUF_TYPE_???");
 337                 if (is_get)
 338                         return 0;
 339                 if (!print_v4l2_format_fmt(tcp, ", ", &f)) {
 340                         tprints("}");
 341                         return RVAL_IOCTL_DECODED;
 342                 }
 343
 344                 return 0;
 345         }
 346
 347         if (!syserror(tcp) && !umove(tcp, arg, &f))
 348                 print_v4l2_format_fmt(tcp, is_get ? ", " : " => ", &f);
 349
 350         tprints("}");
 351
 352         return RVAL_IOCTL_DECODED;
 353 }
 354
 355 #include "xlat/v4l2_memories.h"
 356
 357 static int
 358 print_v4l2_requestbuffers(struct tcb *const tcp, const kernel_ulong_t arg)
 359 {
 360         struct v4l2_requestbuffers reqbufs;
 361
 362         if (entering(tcp)) {
 363                 tprints(", ");
 364
 365                 if (umove_or_printaddr(tcp, arg, &reqbufs))
 366                         return RVAL_IOCTL_DECODED;
 367
 368                 tprintf("{type=");
 369                 printxval(v4l2_buf_types, reqbufs.type, "V4L2_BUF_TYPE_???");
 370                 tprints(", memory=");
 371                 printxval(v4l2_memories, reqbufs.memory, "V4L2_MEMORY_???");
 372                 tprintf(", count=%u", reqbufs.count);
 373
 374                 return 0;
 375         }
 376
 377         if (!syserror(tcp)) {
 378                 tprints(" => ");
 379
 380                 if (!umove(tcp, arg, &reqbufs))
 381                         tprintf("%u", reqbufs.count);
 382                 else
 383                         tprints("???");
 384         }
 385
 386         tprints("}");
 387
 388         return RVAL_IOCTL_DECODED;
 389 }
 390
 391 #include "xlat/v4l2_buf_flags.h"
 392
 393 static int
 394 print_v4l2_buffer(struct tcb *const tcp, const unsigned int code,
 395                   const kernel_ulong_t arg)
 396 {
 397         struct_v4l2_buffer b;
 398
 399         if (entering(tcp)) {
 400                 tprints(", ");
 401                 if (umove_or_printaddr(tcp, arg, &b))
 402                         return RVAL_IOCTL_DECODED;
 403                 tprints("{type=");
 404                 printxval(v4l2_buf_types, b.type, "V4L2_BUF_TYPE_???");
 405                 if (code != VIDIOC_DQBUF)
 406                         tprintf(", index=%u", b.index);
 407
 408                 return 0;
 409         }
 410
 411         if (!syserror(tcp) && !umove(tcp, arg, &b)) {
 412                 if (code == VIDIOC_DQBUF)
 413                         tprintf(", index=%u", b.index);
 414                 tprints(", memory=");
 415                 printxval(v4l2_memories, b.memory, "V4L2_MEMORY_???");
 416
 417                 if (b.memory == V4L2_MEMORY_MMAP) {
 418                         tprintf(", m.offset=%#x", b.m.offset);
 419                 } else if (b.memory == V4L2_MEMORY_USERPTR) {
 420                         tprints(", m.userptr=");
 421                         printaddr(b.m.userptr);
 422                 }
 423
 424                 tprintf(", length=%u, bytesused=%u, flags=",
 425                         b.length, b.bytesused);
 426                 printflags(v4l2_buf_flags, b.flags, "V4L2_BUF_FLAG_???");
 427                 if (code == VIDIOC_DQBUF) {
 428                         tprints(", timestamp = ");
 429                         MPERS_FUNC_NAME(print_struct_timeval)(&b.timestamp);
 430                 }
 431                 tprints(", ...");
 432         }
 433
 434         tprints("}");
 435
 436         return RVAL_IOCTL_DECODED;
 437 }
 438
 439 static int
 440 print_v4l2_framebuffer(struct tcb *const tcp, const kernel_ulong_t arg)
 441 {
 442         struct_v4l2_framebuffer b;
 443
 444         tprints(", ");
 445         if (!umove_or_printaddr(tcp, arg, &b)) {
 446                 tprintf("{capability=%#x, flags=%#x, base=",
 447                         b.capability, b.flags);
 448                 printaddr(ptr_to_kulong(b.base));
 449                 tprints("}");
 450         }
 451
 452         return RVAL_IOCTL_DECODED;
 453 }
 454
 455 static int
 456 print_v4l2_buf_type(struct tcb *const tcp, const kernel_ulong_t arg)
 457 {
 458         int type;
 459
 460         tprints(", ");
 461         if (!umove_or_printaddr(tcp, arg, &type)) {
 462                 tprints("[");
 463                 printxval(v4l2_buf_types, type, "V4L2_BUF_TYPE_???");
 464                 tprints("]");
 465         }
 466         return RVAL_IOCTL_DECODED;
 467 }
 468
 469 #include "xlat/v4l2_streaming_capabilities.h"
 470 #include "xlat/v4l2_capture_modes.h"
 471
 472 static int
 473 print_v4l2_streamparm(struct tcb *const tcp, const kernel_ulong_t arg,
 474                       const bool is_get)
 475 {
 476         struct v4l2_streamparm s;
 477
 478         if (entering(tcp)) {
 479                 tprints(", ");
 480                 if (umove_or_printaddr(tcp, arg, &s))
 481                         return RVAL_IOCTL_DECODED;
 482                 tprints("{type=");
 483                 printxval(v4l2_buf_types, s.type, "V4L2_BUF_TYPE_???");
 484                 switch (s.type) {
 485                         case V4L2_BUF_TYPE_VIDEO_CAPTURE:
 486                         case V4L2_BUF_TYPE_VIDEO_OUTPUT:
 487                                 if (is_get)
 488                                         return 0;
 489                                 tprints(", ");
 490                                 break;
 491                         default:
 492                                 tprints("}");
 493                                 return RVAL_IOCTL_DECODED;
 494                 }
 495         } else {
 496                 if (syserror(tcp) || umove(tcp, arg, &s) < 0) {
 497                         tprints("}");
 498                         return RVAL_IOCTL_DECODED;
 499                 }
 500                 tprints(is_get ? ", " : " => ");
 501         }
 502
 503         if (s.type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
 504                 tprints("parm.capture={capability=");
 505                 printflags(v4l2_streaming_capabilities,
 506                            s.parm.capture.capability, "V4L2_CAP_???");
 507
 508                 tprints(", capturemode=");
 509                 printflags(v4l2_capture_modes,
 510                            s.parm.capture.capturemode, "V4L2_MODE_???");
 511
 512                 tprintf(", timeperframe=" FMT_FRACT,
 513                         ARGS_FRACT(s.parm.capture.timeperframe));
 514
 515                 tprintf(", extendedmode=%u, readbuffers=%u}",
 516                         s.parm.capture.extendedmode,
 517                         s.parm.capture.readbuffers);
 518         } else {
 519                 tprints("parm.output={capability=");
 520                 printflags(v4l2_streaming_capabilities,
 521                            s.parm.output.capability, "V4L2_CAP_???");
 522
 523                 tprintf(", outputmode=%u", s.parm.output.outputmode);
 524
 525                 tprintf(", timeperframe=" FMT_FRACT,
 526                         ARGS_FRACT(s.parm.output.timeperframe));
 527
 528                 tprintf(", extendedmode=%u, writebuffers=%u}",
 529                         s.parm.output.extendedmode,
 530                         s.parm.output.writebuffers);
 531         }
 532         if (entering(tcp)) {
 533                 return 0;
 534         } else {
 535                 tprints("}");
 536                 return RVAL_IOCTL_DECODED;
 537         }
 538 }
 539
 540 static int
 541 print_v4l2_standard(struct tcb *const tcp, const kernel_ulong_t arg)
 542 {
 543         struct_v4l2_standard s;
 544
 545         if (entering(tcp)) {
 546                 tprints(", ");
 547                 if (umove_or_printaddr(tcp, arg, &s))
 548                         return RVAL_IOCTL_DECODED;
 549                 tprintf("{index=%u", s.index);
 550
 551                 return 0;
 552         }
 553
 554         if (!syserror(tcp) && !umove(tcp, arg, &s)) {
 555                 PRINT_FIELD_CSTRING(", ", s, name);
 556                 tprintf(", frameperiod=" FMT_FRACT,
 557                         ARGS_FRACT(s.frameperiod));
 558                 tprintf(", framelines=%d", s.framelines);
 559         }
 560
 561         tprints("}");
 562
 563         return RVAL_IOCTL_DECODED;
 564 }
 565
 566 #include "xlat/v4l2_input_types.h"
 567
 568 static int
 569 print_v4l2_input(struct tcb *const tcp, const kernel_ulong_t arg)
 570 {
 571         struct_v4l2_input i;
 572
 573         if (entering(tcp)) {
 574                 tprints(", ");
 575                 if (umove_or_printaddr(tcp, arg, &i))
 576                         return RVAL_IOCTL_DECODED;
 577                 tprintf("{index=%u", i.index);
 578
 579                 return 0;
 580         }
 581
 582         if (!syserror(tcp) && !umove(tcp, arg, &i)) {
 583                 PRINT_FIELD_CSTRING(", ", i, name);
 584                 tprints(", type=");
 585                 printxval(v4l2_input_types, i.type, "V4L2_INPUT_TYPE_???");
 586         }
 587
 588         tprints("}");
 589
 590         return RVAL_IOCTL_DECODED;
 591 }
 592
 593 /*
 594  * We include it here and not before print_v4l2_ext_controls as we need
 595  * V4L2_CTRL_CLASS_* definitions for V4L2_CID_*_BASE ones.
 596  */
 597 #include "xlat/v4l2_control_classes.h"
 598 #include "xlat/v4l2_control_id_bases.h"
 599 #include "xlat/v4l2_control_ids.h"
 600
 601 static int
 602 print_v4l2_control(struct tcb *const tcp, const kernel_ulong_t arg,
 603                    const bool is_get)
 604 {
 605         struct v4l2_control c;
 606
 607         if (entering(tcp)) {
 608                 tprints(", ");
 609                 if (umove_or_printaddr(tcp, arg, &c))
 610                         return RVAL_IOCTL_DECODED;
 611                 tprints("{id=");
 612                 printxval(v4l2_control_ids, c.id, "V4L2_CID_???");
 613                 if (!is_get)
 614                         tprintf(", value=%d", c.value);
 615                 return 0;
 616         }
 617
 618         if (!syserror(tcp) && !umove(tcp, arg, &c)) {
 619                 tprints(is_get ? ", " : " => ");
 620                 tprintf("value=%d", c.value);
 621         }
 622
 623         tprints("}");
 624
 625         return RVAL_IOCTL_DECODED;
 626 }
 627
 628 #include "xlat/v4l2_tuner_types.h"
 629 #include "xlat/v4l2_tuner_capabilities.h"
 630 #include "xlat/v4l2_tuner_rxsubchanses.h"
 631 #include "xlat/v4l2_tuner_audmodes.h"
 632
 633 static int
 634 print_v4l2_tuner(struct tcb *const tcp, const kernel_ulong_t arg,
 635                  const bool is_get)
 636 {
 637         struct v4l2_tuner c;
 638         if (entering(tcp)) {
 639                 tprints(", ");
 640                 if (umove_or_printaddr(tcp, arg, &c))
 641                         return RVAL_IOCTL_DECODED;
 642                 tprintf("{index=%u", c.index);
 643                 if (is_get)
 644                         return 0;
 645                 tprints(", ");
 646         } else {
 647                 if (syserror(tcp) || umove(tcp, arg, &c) < 0) {
 648                         tprints("}");
 649                         return RVAL_IOCTL_DECODED;
 650                 }
 651                 tprints(is_get ? ", " : " => ");
 652         }
 653
 654         PRINT_FIELD_CSTRING("", c, name);
 655         tprints(", type=");
 656         printxval(v4l2_tuner_types, c.type, "V4L2_TUNER_TYPE_???");
 657         tprints(", capability=");
 658         printxval(v4l2_tuner_capabilities, c.capability,
 659                   "V4L2_TUNER_CAP_???");
 660         tprintf(", rangelow=%u, rangehigh=%u, rxsubchans=",
 661                 c.rangelow, c.rangehigh);
 662         printxval(v4l2_tuner_rxsubchanses, c.rxsubchans,
 663                   "V4L2_TUNER_SUB_???");
 664         tprints(", audmode=");
 665         printxval(v4l2_tuner_audmodes, c.audmode,
 666                   "V4L2_TUNER_MODE_???");
 667         tprintf(", signal=%d, afc=%d", c.signal, c.afc);
 668
 669         if (entering(tcp)) {
 670                 return 0;
 671         } else {
 672                 tprints("}");
 673                 return RVAL_IOCTL_DECODED;
 674         }
 675 }
 676
 677 #include "xlat/v4l2_control_types.h"
 678 #include "xlat/v4l2_control_flags.h"
 679
 680 static int
 681 print_v4l2_queryctrl(struct tcb *const tcp, const kernel_ulong_t arg)
 682 {
 683         struct v4l2_queryctrl c;
 684
 685         if (entering(tcp)) {
 686                 tprints(", ");
 687                 if (umove_or_printaddr(tcp, arg, &c))
 688                         return RVAL_IOCTL_DECODED;
 689                 tprints("{id=");
 690         } else {
 691                 if (syserror(tcp) || umove(tcp, arg, &c) < 0) {
 692                         tprints("}");
 693                         return RVAL_IOCTL_DECODED;
 694                 }
 695                 if (get_tcb_priv_ulong(tcp))
 696                         tprints(" => ");
 697         }
 698
 699         if (entering(tcp) || get_tcb_priv_ulong(tcp)) {
 700 #ifdef V4L2_CTRL_FLAG_NEXT_CTRL
 701                 const unsigned long next = c.id & V4L2_CTRL_FLAG_NEXT_CTRL;
 702                 set_tcb_priv_ulong(tcp, next);
 703                 if (next) {
 704                         print_xlat(V4L2_CTRL_FLAG_NEXT_CTRL);
 705                         tprints("|");
 706                         c.id &= ~V4L2_CTRL_FLAG_NEXT_CTRL;
 707                 }
 708 #endif
 709                 printxval(v4l2_control_ids, c.id, "V4L2_CID_???");
 710         }
 711
 712         if (exiting(tcp)) {
 713                 tprints(", type=");
 714                 printxval(v4l2_control_types, c.type, "V4L2_CTRL_TYPE_???");
 715                 PRINT_FIELD_CSTRING(", ", c, name);
 716                 tprintf(", minimum=%d, maximum=%d, step=%d"
 717                         ", default_value=%d, flags=",
 718                         c.minimum, c.maximum, c.step, c.default_value);
 719                 printflags(v4l2_control_flags, c.flags, "V4L2_CTRL_FLAG_???");
 720                 tprints("}");
 721         }
 722         return entering(tcp) ? 0 : RVAL_IOCTL_DECODED;
 723 }
 724
 725 static int
 726 print_v4l2_cropcap(struct tcb *const tcp, const kernel_ulong_t arg)
 727 {
 728         struct v4l2_cropcap c;
 729
 730         if (entering(tcp)) {
 731                 tprints(", ");
 732                 if (umove_or_printaddr(tcp, arg, &c))
 733                         return RVAL_IOCTL_DECODED;
 734                 tprints("{type=");
 735                 printxval(v4l2_buf_types, c.type, "V4L2_BUF_TYPE_???");
 736
 737                 return 0;
 738         }
 739
 740         if (!syserror(tcp) && !umove(tcp, arg, &c)) {
 741                 tprintf(", bounds=" FMT_RECT
 742                         ", defrect=" FMT_RECT
 743                         ", pixelaspect=" FMT_FRACT,
 744                         ARGS_RECT(c.bounds),
 745                         ARGS_RECT(c.defrect),
 746                         ARGS_FRACT(c.pixelaspect));
 747         }
 748
 749         tprints("}");
 750
 751         return RVAL_IOCTL_DECODED;
 752 }
 753
 754 static int
 755 print_v4l2_crop(struct tcb *const tcp, const kernel_ulong_t arg,
 756                 const bool is_get)
 757 {
 758         struct v4l2_crop c;
 759
 760         if (entering(tcp)) {
 761                 tprints(", ");
 762                 if (umove_or_printaddr(tcp, arg, &c))
 763                         return RVAL_IOCTL_DECODED;
 764                 tprints("{type=");
 765                 printxval(v4l2_buf_types, c.type, "V4L2_BUF_TYPE_???");
 766                 if (is_get)
 767                         return 0;
 768                 tprintf(", c=" FMT_RECT, ARGS_RECT(c.c));
 769         } else {
 770                 if (!syserror(tcp) && !umove(tcp, arg, &c))
 771                         tprintf(", c=" FMT_RECT, ARGS_RECT(c.c));
 772         }
 773
 774         tprints("}");
 775
 776         return RVAL_IOCTL_DECODED;
 777 }
 778
 779 #ifdef VIDIOC_S_EXT_CTRLS
 780 static bool
 781 print_v4l2_ext_control(struct tcb *tcp, void *elem_buf, size_t elem_size, void *data)
 782 {
 783         const struct_v4l2_ext_control *p = elem_buf;
 784
 785         tprints("{id=");
 786         printxval(v4l2_control_ids, p->id, "V4L2_CID_???");
 787 # if HAVE_DECL_V4L2_CTRL_TYPE_STRING
 788         tprintf(", size=%u", p->size);
 789         if (p->size > 0) {
 790                 tprints(", string=");
 791                 printstrn(tcp, ptr_to_kulong(p->string), p->size);
 792         } else
 793 # endif
 794         tprintf(", value=%d, value64=%" PRId64, p->value, (int64_t) p->value64);
 795         tprints("}");
 796
 797         return true;
 798 }
 799
 800 static int
 801 print_v4l2_ext_controls(struct tcb *const tcp, const kernel_ulong_t arg,
 802                         const bool is_get)
 803 {
 804         struct_v4l2_ext_controls c;
 805
 806         if (entering(tcp)) {
 807                 tprints(", ");
 808                 if (umove_or_printaddr(tcp, arg, &c))
 809                         return RVAL_IOCTL_DECODED;
 810                 tprints("{ctrl_class=");
 811                 printxval(v4l2_control_classes, c.ctrl_class,
 812                           "V4L2_CTRL_CLASS_???");
 813                 tprintf(", count=%u", c.count);
 814                 if (!c.count) {
 815                         tprints("}");
 816                         return RVAL_IOCTL_DECODED;
 817                 }
 818                 if (is_get)
 819                         return 0;
 820                 tprints(", ");
 821         } else {
 822                 if (umove(tcp, arg, &c) < 0) {
 823                         tprints("}");
 824                         return RVAL_IOCTL_DECODED;
 825                 }
 826                 tprints(is_get ? ", " : " => ");
 827         }
 828
 829         tprints("controls=");
 830         struct_v4l2_ext_control ctrl;
 831         bool fail = !print_array(tcp, ptr_to_kulong(c.controls), c.count,
 832                                  &ctrl, sizeof(ctrl),
 833                                  tfetch_mem_ignore_syserror,
 834                                  print_v4l2_ext_control, 0);
 835
 836         if (exiting(tcp) && syserror(tcp))
 837                 tprintf(", error_idx=%u", c.error_idx);
 838
 839         if (exiting(tcp) || fail) {
 840                 tprints("}");
 841                 return RVAL_IOCTL_DECODED;
 842         }
 843
 844         /* entering */
 845         return 0;
 846 }
 847 #endif /* VIDIOC_S_EXT_CTRLS */
 848
 849 #ifdef VIDIOC_ENUM_FRAMESIZES
 850 # include "xlat/v4l2_framesize_types.h"
 851
 852 static int
 853 print_v4l2_frmsizeenum(struct tcb *const tcp, const kernel_ulong_t arg)
 854 {
 855         struct v4l2_frmsizeenum s;
 856
 857         if (entering(tcp)) {
 858                 tprints(", ");
 859                 if (umove_or_printaddr(tcp, arg, &s))
 860                         return RVAL_IOCTL_DECODED;
 861                 tprintf("{index=%u, pixel_format=", s.index);
 862                 print_pixelformat(s.pixel_format, v4l2_pix_fmts);
 863                 return 0;
 864         }
 865
 866         if (!syserror(tcp) && !umove(tcp, arg, &s)) {
 867                 tprints(", type=");
 868                 printxval(v4l2_framesize_types, s.type, "V4L2_FRMSIZE_TYPE_???");
 869                 switch (s.type) {
 870                 case V4L2_FRMSIZE_TYPE_DISCRETE:
 871                         tprintf(", discrete={width=%u, height=%u}",
 872                                 s.discrete.width, s.discrete.height);
 873                         break;
 874                 case V4L2_FRMSIZE_TYPE_STEPWISE:
 875                         tprintf(", stepwise={min_width=%u, max_width=%u, "
 876                                 "step_width=%u, min_height=%u, max_height=%u, "
 877                                 "step_height=%u}",
 878                                 s.stepwise.min_width, s.stepwise.max_width,
 879                                 s.stepwise.step_width, s.stepwise.min_height,
 880                                 s.stepwise.max_height, s.stepwise.step_height);
 881                         break;
 882                 }
 883         }
 884         tprints("}");
 885         return RVAL_IOCTL_DECODED;
 886 }
 887 #endif /* VIDIOC_ENUM_FRAMESIZES */
 888
 889 #ifdef VIDIOC_ENUM_FRAMEINTERVALS
 890 # include "xlat/v4l2_frameinterval_types.h"
 891
 892 static int
 893 print_v4l2_frmivalenum(struct tcb *const tcp, const kernel_ulong_t arg)
 894 {
 895         struct v4l2_frmivalenum f;
 896
 897         if (entering(tcp)) {
 898                 tprints(", ");
 899                 if (umove_or_printaddr(tcp, arg, &f))
 900                         return RVAL_IOCTL_DECODED;
 901                 tprintf("{index=%u, pixel_format=", f.index);
 902                 print_pixelformat(f.pixel_format, v4l2_pix_fmts);
 903                 tprintf(", width=%u, height=%u", f.width, f.height);
 904                 return 0;
 905         }
 906
 907         if (!syserror(tcp) && !umove(tcp, arg, &f)) {
 908                 tprints(", type=");
 909                 printxval(v4l2_frameinterval_types, f.type,
 910                           "V4L2_FRMIVAL_TYPE_???");
 911                 switch (f.type) {
 912                 case V4L2_FRMIVAL_TYPE_DISCRETE:
 913                         tprintf(", discrete=" FMT_FRACT,
 914                                 ARGS_FRACT(f.discrete));
 915                         break;
 916                 case V4L2_FRMIVAL_TYPE_STEPWISE:
 917                 case V4L2_FRMSIZE_TYPE_CONTINUOUS:
 918                         tprintf(", stepwise={min=" FMT_FRACT ", max="
 919                                 FMT_FRACT ", step=" FMT_FRACT "}",
 920                                 ARGS_FRACT(f.stepwise.min),
 921                                 ARGS_FRACT(f.stepwise.max),
 922                                 ARGS_FRACT(f.stepwise.step));
 923                         break;
 924                 }
 925         }
 926
 927         tprints("}");
 928
 929         return RVAL_IOCTL_DECODED;
 930 }
 931 #endif /* VIDIOC_ENUM_FRAMEINTERVALS */
 932
 933 #ifdef VIDIOC_CREATE_BUFS
 934 static int
 935 print_v4l2_create_buffers(struct tcb *const tcp, const kernel_ulong_t arg)
 936 {
 937         static const char fmt[] = "{index=%u, count=%u}";
 938         static char outstr[sizeof(fmt) + sizeof(int) * 6];
 939
 940         struct_v4l2_create_buffers b;
 941
 942         if (entering(tcp)) {
 943                 tprints(", ");
 944                 if (umove_or_printaddr(tcp, arg, &b))
 945                         return RVAL_IOCTL_DECODED;
 946                 tprintf("{count=%u, memory=", b.count);
 947                 printxval(v4l2_memories, b.memory, "V4L2_MEMORY_???");
 948                 tprints(", format={type=");
 949                 printxval(v4l2_buf_types, b.format.type,
 950                           "V4L2_BUF_TYPE_???");
 951                 print_v4l2_format_fmt(tcp, ", ",
 952                                       (struct_v4l2_format *) &b.format);
 953                 tprints("}}");
 954                 return 0;
 955         }
 956
 957         if (syserror(tcp) || umove(tcp, arg, &b))
 958                 return RVAL_IOCTL_DECODED;
 959
 960         xsprintf(outstr, fmt, b.index, b.count);
 961         tcp->auxstr = outstr;
 962
 963         return RVAL_IOCTL_DECODED | RVAL_STR;
 964 }
 965 #endif /* VIDIOC_CREATE_BUFS */
 966
 967 MPERS_PRINTER_DECL(int, v4l2_ioctl, struct tcb *const tcp,
 968                    const unsigned int code, const kernel_ulong_t arg)
 969 {
 970         if (!verbose(tcp))
 971                 return RVAL_DECODED;
 972
 973         switch (code) {
 974         case VIDIOC_QUERYCAP: /* R */
 975                 return print_v4l2_capability(tcp, arg);
 976
 977         case VIDIOC_ENUM_FMT: /* RW */
 978                 return print_v4l2_fmtdesc(tcp, arg);
 979
 980         case VIDIOC_G_FMT: /* RW */
 981         case VIDIOC_S_FMT: /* RW */
 982         case VIDIOC_TRY_FMT: /* RW */
 983                 return print_v4l2_format(tcp, arg, code == VIDIOC_G_FMT);
 984
 985         case VIDIOC_REQBUFS: /* RW */
 986                 return print_v4l2_requestbuffers(tcp, arg);
 987
 988         case VIDIOC_QUERYBUF: /* RW */
 989         case VIDIOC_QBUF: /* RW */
 990         case VIDIOC_DQBUF: /* RW */
 991                 return print_v4l2_buffer(tcp, code, arg);
 992
 993         case VIDIOC_G_FBUF: /* R */
 994                 if (entering(tcp))
 995                         return 0;
 996                 ATTRIBUTE_FALLTHROUGH;
 997         case VIDIOC_S_FBUF: /* W */
 998                 return print_v4l2_framebuffer(tcp, arg);
 999
1000         case VIDIOC_STREAMON: /* W */
1001         case VIDIOC_STREAMOFF: /* W */
1002                 return print_v4l2_buf_type(tcp, arg);
1003
1004         case VIDIOC_G_PARM: /* RW */
1005         case VIDIOC_S_PARM: /* RW */
1006                 return print_v4l2_streamparm(tcp, arg, code == VIDIOC_G_PARM);
1007
1008         case VIDIOC_G_STD: /* R */
1009                 if (entering(tcp))
1010                         return 0;
1011                 ATTRIBUTE_FALLTHROUGH;
1012         case VIDIOC_S_STD: /* W */
1013                 tprints(", ");
1014                 printnum_int64(tcp, arg, "%#" PRIx64);
1015                 break;
1016
1017         case VIDIOC_ENUMSTD: /* RW */
1018                 return print_v4l2_standard(tcp, arg);
1019
1020         case VIDIOC_ENUMINPUT: /* RW */
1021                 return print_v4l2_input(tcp, arg);
1022
1023         case VIDIOC_G_CTRL: /* RW */
1024         case VIDIOC_S_CTRL: /* RW */
1025                 return print_v4l2_control(tcp, arg, code == VIDIOC_G_CTRL);
1026
1027         case VIDIOC_G_TUNER: /* RW */
1028         case VIDIOC_S_TUNER: /* RW */
1029                 return print_v4l2_tuner(tcp, arg, code == VIDIOC_G_TUNER);
1030
1031         case VIDIOC_QUERYCTRL: /* RW */
1032                 return print_v4l2_queryctrl(tcp, arg);
1033
1034         case VIDIOC_G_INPUT: /* R */
1035                 if (entering(tcp))
1036                         return 0;
1037                 ATTRIBUTE_FALLTHROUGH;
1038         case VIDIOC_S_INPUT: /* RW */
1039                 tprints(", ");
1040                 printnum_int(tcp, arg, "%u");
1041                 break;
1042
1043         case VIDIOC_CROPCAP: /* RW */
1044                 return print_v4l2_cropcap(tcp, arg);
1045
1046         case VIDIOC_G_CROP: /* RW */
1047         case VIDIOC_S_CROP: /* W */
1048                 return print_v4l2_crop(tcp, arg, code == VIDIOC_G_CROP);
1049
1050 #ifdef VIDIOC_S_EXT_CTRLS
1051         case VIDIOC_S_EXT_CTRLS: /* RW */
1052         case VIDIOC_TRY_EXT_CTRLS: /* RW */
1053         case VIDIOC_G_EXT_CTRLS: /* RW */
1054                 return print_v4l2_ext_controls(tcp, arg,
1055                                                code == VIDIOC_G_EXT_CTRLS);
1056 #endif /* VIDIOC_S_EXT_CTRLS */
1057
1058 #ifdef VIDIOC_ENUM_FRAMESIZES
1059         case VIDIOC_ENUM_FRAMESIZES: /* RW */
1060                 return print_v4l2_frmsizeenum(tcp, arg);
1061 #endif /* VIDIOC_ENUM_FRAMESIZES */
1062
1063 #ifdef VIDIOC_ENUM_FRAMEINTERVALS
1064         case VIDIOC_ENUM_FRAMEINTERVALS: /* RW */
1065                 return print_v4l2_frmivalenum(tcp, arg);
1066 #endif /* VIDIOC_ENUM_FRAMEINTERVALS */
1067
1068 #ifdef VIDIOC_CREATE_BUFS
1069         case VIDIOC_CREATE_BUFS: /* RW */
1070                 return print_v4l2_create_buffers(tcp, arg);
1071 #endif /* VIDIOC_CREATE_BUFS */
1072
1073         default:
1074                 return RVAL_DECODED;
1075         }
1076
1077         return RVAL_IOCTL_DECODED;
1078 }