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) 2014-2017 The strace developers.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. The name of the author may not be used to endorse or promote products
  17  *    derived from this software without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  20  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  21  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  22  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  23  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  24  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  28  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29  */
  30
  31 #include "defs.h"
  32
  33 #include DEF_MPERS_TYPE(struct_v4l2_buffer)
  34 #include DEF_MPERS_TYPE(struct_v4l2_clip)
  35 #include DEF_MPERS_TYPE(struct_v4l2_create_buffers)
  36 #include DEF_MPERS_TYPE(struct_v4l2_ext_control)
  37 #include DEF_MPERS_TYPE(struct_v4l2_ext_controls)
  38 #include DEF_MPERS_TYPE(struct_v4l2_format)
  39 #include DEF_MPERS_TYPE(struct_v4l2_framebuffer)
  40 #include DEF_MPERS_TYPE(struct_v4l2_input)
  41 #include DEF_MPERS_TYPE(struct_v4l2_standard)
  42
  43 #include <stdint.h>
  44 #include <linux/ioctl.h>
  45 #include <linux/types.h>
  46 #include <linux/videodev2.h>
  47
  48 typedef struct v4l2_buffer struct_v4l2_buffer;
  49 typedef struct v4l2_clip struct_v4l2_clip;
  50 typedef struct v4l2_create_buffers struct_v4l2_create_buffers;
  51 typedef struct v4l2_ext_control struct_v4l2_ext_control;
  52 typedef struct v4l2_ext_controls struct_v4l2_ext_controls;
  53 typedef struct v4l2_format struct_v4l2_format;
  54 typedef struct v4l2_framebuffer struct_v4l2_framebuffer;
  55 typedef struct v4l2_input struct_v4l2_input;
  56 typedef struct v4l2_standard struct_v4l2_standard;
  57
  58 #include MPERS_DEFS
  59
  60 #include "print_fields.h"
  61
  62 /* some historical constants */
  63 #ifndef V4L2_CID_HCENTER
  64 #define V4L2_CID_HCENTER (V4L2_CID_BASE+22)
  65 #endif
  66 #ifndef V4L2_CID_VCENTER
  67 #define V4L2_CID_VCENTER (V4L2_CID_BASE+23)
  68 #endif
  69 #ifndef V4L2_CID_BAND_STOP_FILTER
  70 #define V4L2_CID_BAND_STOP_FILTER (V4L2_CID_BASE+33)
  71 #endif
  72
  73 #define FMT_FRACT "%u/%u"
  74 #define ARGS_FRACT(x) ((x).numerator), ((x).denominator)
  75
  76 #define FMT_RECT "{left=%d, top=%d, width=%u, height=%u}"
  77 #define ARGS_RECT(x) (x).left, (x).top, (x).width, (x).height
  78
  79 static void
  80 print_pixelformat(uint32_t fourcc)
  81 {
  82         const union {
  83                 uint32_t pixelformat;
  84                 unsigned char cc[sizeof(uint32_t)];
  85         } u = {
  86 #if WORDS_BIGENDIAN
  87                 .cc = {
  88                         (unsigned char) (fourcc >> 24),
  89                         (unsigned char) (fourcc >> 16),
  90                         (unsigned char) (fourcc >> 8),
  91                         (unsigned char) fourcc
  92                 }
  93 #else
  94                 .pixelformat = fourcc
  95 #endif
  96         };
  97         unsigned int i;
  98
  99         tprints("v4l2_fourcc(");
 100         for (i = 0; i < sizeof(u.cc); ++i) {
 101                 unsigned char c = u.cc[i];
 102
 103                 if (i)
 104                         tprints(", ");
 105                 if (c == '\'' || c == '\\') {
 106                         char sym[] = {
 107                                 '\'',
 108                                 '\\',
 109                                 c,
 110                                 '\'',
 111                                 '\0'
 112                         };
 113                         tprints(sym);
 114                 } else if (c >= ' ' && c <= 0x7e) {
 115                         char sym[] = {
 116                                 '\'',
 117                                 c,
 118                                 '\'',
 119                                 '\0'
 120                         };
 121                         tprints(sym);
 122                 } else {
 123                         char hex[] = {
 124                                 '\'',
 125                                 '\\',
 126                                 'x',
 127                                 "0123456789abcdef"[c >> 4],
 128                                 "0123456789abcdef"[c & 0xf],
 129                                 '\'',
 130                                 '\0'
 131                         };
 132                         tprints(hex);
 133                 }
 134         }
 135         tprints(")");
 136 }
 137
 138 #include "xlat/v4l2_device_capabilities_flags.h"
 139
 140 static int
 141 print_v4l2_capability(struct tcb *const tcp, const kernel_ulong_t arg)
 142 {
 143         struct v4l2_capability caps;
 144
 145         if (entering(tcp))
 146                 return 0;
 147         tprints(", ");
 148         if (umove_or_printaddr(tcp, arg, &caps))
 149                 return 1;
 150         PRINT_FIELD_CSTRING("{", caps, driver);
 151         PRINT_FIELD_CSTRING(", ", caps, card);
 152         PRINT_FIELD_CSTRING(", ", caps, bus_info);
 153         tprintf(", version=%u.%u.%u, capabilities=",
 154                 (caps.version >> 16) & 0xFF,
 155                 (caps.version >> 8) & 0xFF,
 156                 caps.version & 0xFF);
 157         printflags(v4l2_device_capabilities_flags, caps.capabilities,
 158                    "V4L2_CAP_???");
 159 #ifdef V4L2_CAP_DEVICE_CAPS
 160         tprints(", device_caps=");
 161         printflags(v4l2_device_capabilities_flags, caps.device_caps,
 162                    "V4L2_CAP_???");
 163 #endif
 164         tprints("}");
 165         return 1;
 166 }
 167
 168 #include "xlat/v4l2_buf_types.h"
 169 #include "xlat/v4l2_format_description_flags.h"
 170
 171 static int
 172 print_v4l2_fmtdesc(struct tcb *const tcp, const kernel_ulong_t arg)
 173 {
 174         struct v4l2_fmtdesc f;
 175
 176         if (entering(tcp)) {
 177                 tprints(", ");
 178                 if (umove_or_printaddr(tcp, arg, &f))
 179                         return RVAL_DECODED | 1;
 180                 tprintf("{index=%u, type=", f.index);
 181                 printxval(v4l2_buf_types, f.type, "V4L2_BUF_TYPE_???");
 182                 return 0;
 183         }
 184
 185         if (!syserror(tcp) && !umove(tcp, arg, &f)) {
 186                 tprints(", flags=");
 187                 printflags(v4l2_format_description_flags, f.flags,
 188                            "V4L2_FMT_FLAG_???");
 189                 PRINT_FIELD_CSTRING(", ", f, description);
 190                 tprints(", pixelformat=");
 191                 print_pixelformat(f.pixelformat);
 192         }
 193         tprints("}");
 194         return 1;
 195 }
 196
 197 #include "xlat/v4l2_fields.h"
 198 #include "xlat/v4l2_colorspaces.h"
 199 #include "xlat/v4l2_vbi_flags.h"
 200 #include "xlat/v4l2_sliced_flags.h"
 201
 202 static bool
 203 print_v4l2_clip(struct tcb *tcp, void *elem_buf, size_t elem_size, void *data)
 204 {
 205         const struct_v4l2_clip *p = elem_buf;
 206         tprintf(FMT_RECT, ARGS_RECT(p->c));
 207         return true;
 208 }
 209
 210 static bool
 211 print_v4l2_format_fmt(struct tcb *const tcp, const char *prefix,
 212                       const struct_v4l2_format *f)
 213 {
 214         bool ret = true;
 215         switch (f->type) {
 216         case V4L2_BUF_TYPE_VIDEO_CAPTURE:
 217         case V4L2_BUF_TYPE_VIDEO_OUTPUT:
 218                 tprints(prefix);
 219                 tprintf("fmt.pix={width=%u, height=%u, pixelformat=",
 220                         f->fmt.pix.width, f->fmt.pix.height);
 221                 print_pixelformat(f->fmt.pix.pixelformat);
 222                 tprints(", field=");
 223                 printxval(v4l2_fields, f->fmt.pix.field, "V4L2_FIELD_???");
 224                 tprintf(", bytesperline=%u, sizeimage=%u, colorspace=",
 225                         f->fmt.pix.bytesperline, f->fmt.pix.sizeimage);
 226                 printxval(v4l2_colorspaces, f->fmt.pix.colorspace,
 227                           "V4L2_COLORSPACE_???");
 228                 tprints("}");
 229                 break;
 230 #if HAVE_DECL_V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE
 231         case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
 232         case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE: {
 233                 unsigned int i, max;
 234
 235                 tprints(prefix);
 236                 tprintf("fmt.pix_mp={width=%u, height=%u, pixelformat=",
 237                         f->fmt.pix_mp.width, f->fmt.pix_mp.height);
 238                 print_pixelformat(f->fmt.pix_mp.pixelformat);
 239                 tprints(", field=");
 240                 printxval(v4l2_fields, f->fmt.pix_mp.field, "V4L2_FIELD_???");
 241                 tprints(", colorspace=");
 242                 printxval(v4l2_colorspaces, f->fmt.pix_mp.colorspace,
 243                           "V4L2_COLORSPACE_???");
 244                 tprints(", plane_fmt=[");
 245                 max = f->fmt.pix_mp.num_planes;
 246                 if (max > VIDEO_MAX_PLANES)
 247                         max = VIDEO_MAX_PLANES;
 248                 for (i = 0; i < max; i++) {
 249                         if (i > 0)
 250                                 tprints(", ");
 251                         tprintf("{sizeimage=%u, bytesperline=%u}",
 252                                 f->fmt.pix_mp.plane_fmt[i].sizeimage,
 253                                 f->fmt.pix_mp.plane_fmt[i].bytesperline);
 254                 }
 255                 tprintf("], num_planes=%u}",
 256                         (unsigned) f->fmt.pix_mp.num_planes);
 257                 break;
 258         }
 259 #endif
 260         /* OUTPUT_OVERLAY since Linux v2.6.22-rc1~1118^2~179 */
 261 #if HAVE_DECL_V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY
 262         case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
 263 #endif
 264         case V4L2_BUF_TYPE_VIDEO_OVERLAY: {
 265                 struct_v4l2_clip clip;
 266                 tprints(prefix);
 267                 tprintf("fmt.win={left=%d, top=%d, width=%u, height=%u, field=",
 268                         ARGS_RECT(f->fmt.win.w));
 269                 printxval(v4l2_fields, f->fmt.win.field, "V4L2_FIELD_???");
 270                 tprintf(", chromakey=%#x, clips=", f->fmt.win.chromakey);
 271                 ret = print_array(tcp, ptr_to_kulong(f->fmt.win.clips),
 272                                   f->fmt.win.clipcount, &clip, sizeof(clip),
 273                                   umoven_or_printaddr, print_v4l2_clip, 0);
 274                 tprintf(", clipcount=%u, bitmap=", f->fmt.win.clipcount);
 275                 printaddr(ptr_to_kulong(f->fmt.win.bitmap));
 276 #ifdef HAVE_STRUCT_V4L2_WINDOW_GLOBAL_ALPHA
 277                 tprintf(", global_alpha=%#x", f->fmt.win.global_alpha);
 278 #endif
 279                 tprints("}");
 280                 break;
 281         }
 282         case V4L2_BUF_TYPE_VBI_CAPTURE:
 283         case V4L2_BUF_TYPE_VBI_OUTPUT:
 284                 tprints(prefix);
 285                 tprintf("fmt.vbi={sampling_rate=%u, offset=%u, "
 286                         "samples_per_line=%u, sample_format=",
 287                         f->fmt.vbi.sampling_rate, f->fmt.vbi.offset,
 288                         f->fmt.vbi.samples_per_line);
 289                 print_pixelformat(f->fmt.vbi.sample_format);
 290                 tprintf(", start=[%u, %u], count=[%u, %u], ",
 291                         f->fmt.vbi.start[0], f->fmt.vbi.start[1],
 292                         f->fmt.vbi.count[0], f->fmt.vbi.count[1]);
 293                 tprints("flags=");
 294                 printxval(v4l2_vbi_flags, f->fmt.vbi.flags, "V4L2_VBI_???");
 295                 tprints("}");
 296                 break;
 297         /* both since Linux v2.6.14-rc2~64 */
 298 #if HAVE_DECL_V4L2_BUF_TYPE_SLICED_VBI_CAPTURE
 299         case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
 300         case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT: {
 301                 unsigned int i, j;
 302
 303                 tprints(prefix);
 304                 tprints("fmt.sliced={service_set=");
 305                 printxval(v4l2_sliced_flags, f->fmt.sliced.service_set,
 306                         "V4L2_SLICED_???");
 307                 tprintf(", io_size=%u, service_lines=[",
 308                         f->fmt.sliced.io_size);
 309                 for (i = 0; i < ARRAY_SIZE(f->fmt.sliced.service_lines); i++) {
 310                         if (i > 0)
 311                                 tprints(", ");
 312                         tprints("[");
 313                         for (j = 0;
 314                              j < ARRAY_SIZE(f->fmt.sliced.service_lines[0]);
 315                              j++) {
 316                                 if (j > 0)
 317                                         tprints(", ");
 318                                 tprintf("%#x",
 319                                         f->fmt.sliced.service_lines[i][j]);
 320                         }
 321                         tprints("]");
 322                 }
 323                 tprints("]}");
 324                 break;
 325         }
 326 #endif
 327         /* since Linux v4.4-rc1~118^2~14 */
 328 #if HAVE_DECL_V4L2_BUF_TYPE_SDR_OUTPUT
 329         case V4L2_BUF_TYPE_SDR_OUTPUT:
 330 #endif
 331         /* since Linux v3.15-rc1~85^2~213 */
 332 #if HAVE_DECL_V4L2_BUF_TYPE_SDR_CAPTURE
 333         case V4L2_BUF_TYPE_SDR_CAPTURE:
 334                 tprints(prefix);
 335                 tprints("fmt.sdr={pixelformat=");
 336                 print_pixelformat(f->fmt.sdr.pixelformat);
 337 #ifdef HAVE_STRUCT_V4L2_SDR_FORMAT_BUFFERSIZE
 338                 tprintf(", buffersize=%u",
 339                         f->fmt.sdr.buffersize);
 340 #endif
 341                 tprints("}");
 342                 break;
 343 #endif
 344         }
 345         return ret;
 346 }
 347
 348 static int
 349 print_v4l2_format(struct tcb *const tcp, const kernel_ulong_t arg,
 350                   const bool is_get)
 351 {
 352         struct_v4l2_format f;
 353
 354         if (entering(tcp)) {
 355                 tprints(", ");
 356                 if (umove_or_printaddr(tcp, arg, &f))
 357                         return RVAL_DECODED | 1;
 358                 tprints("{type=");
 359                 printxval(v4l2_buf_types, f.type, "V4L2_BUF_TYPE_???");
 360                 if (is_get)
 361                         return 0;
 362                 if (!print_v4l2_format_fmt(tcp, ", ", &f)) {
 363                         tprints("}");
 364                         return RVAL_DECODED | 1;
 365                 }
 366         } else {
 367                 if (!syserror(tcp) && !umove(tcp, arg, &f)) {
 368                         const char *delim = is_get ? ", " : " => ";
 369                         print_v4l2_format_fmt(tcp, delim, &f);
 370                 }
 371                 tprints("}");
 372         }
 373         return 1;
 374 }
 375
 376 #include "xlat/v4l2_memories.h"
 377
 378 static int
 379 print_v4l2_requestbuffers(struct tcb *const tcp, const kernel_ulong_t arg)
 380 {
 381         struct v4l2_requestbuffers reqbufs;
 382
 383         if (entering(tcp)) {
 384                 tprints(", ");
 385                 if (umove_or_printaddr(tcp, arg, &reqbufs))
 386                         return RVAL_DECODED | 1;
 387                 tprintf("{count=%u, type=", reqbufs.count);
 388                 printxval(v4l2_buf_types, reqbufs.type, "V4L2_BUF_TYPE_???");
 389                 tprints(", memory=");
 390                 printxval(v4l2_memories, reqbufs.memory, "V4L2_MEMORY_???");
 391                 tprints("}");
 392                 return 0;
 393         } else {
 394                 static char outstr[sizeof("{count=}") + sizeof(int) * 3];
 395
 396                 if (syserror(tcp) || umove(tcp, arg, &reqbufs) < 0)
 397                         return 1;
 398                 sprintf(outstr, "{count=%u}", reqbufs.count);
 399                 tcp->auxstr = outstr;
 400                 return 1 + RVAL_STR;
 401         }
 402 }
 403
 404 #include "xlat/v4l2_buf_flags.h"
 405
 406 static int
 407 print_v4l2_buffer(struct tcb *const tcp, const unsigned int code,
 408                   const kernel_ulong_t arg)
 409 {
 410         struct_v4l2_buffer b;
 411
 412         if (entering(tcp)) {
 413                 tprints(", ");
 414                 if (umove_or_printaddr(tcp, arg, &b))
 415                         return RVAL_DECODED | 1;
 416                 tprints("{type=");
 417                 printxval(v4l2_buf_types, b.type, "V4L2_BUF_TYPE_???");
 418                 if (code != VIDIOC_DQBUF)
 419                         tprintf(", index=%u", b.index);
 420         } else {
 421                 if (!syserror(tcp) && umove(tcp, arg, &b) == 0) {
 422                         if (code == VIDIOC_DQBUF)
 423                                 tprintf(", index=%u", b.index);
 424                         tprints(", memory=");
 425                         printxval(v4l2_memories, b.memory, "V4L2_MEMORY_???");
 426
 427                         if (b.memory == V4L2_MEMORY_MMAP) {
 428                                 tprintf(", m.offset=%#x", b.m.offset);
 429                         } else if (b.memory == V4L2_MEMORY_USERPTR) {
 430                                 tprints(", m.userptr=");
 431                                 printaddr(b.m.userptr);
 432                         }
 433
 434                         tprintf(", length=%u, bytesused=%u, flags=",
 435                                 b.length, b.bytesused);
 436                         printflags(v4l2_buf_flags, b.flags, "V4L2_BUF_FLAG_???");
 437                         if (code == VIDIOC_DQBUF) {
 438                                 tprints(", timestamp = ");
 439                                 MPERS_FUNC_NAME(print_struct_timeval)(&b.timestamp);
 440                         }
 441                         tprints(", ...");
 442                 }
 443                 tprints("}");
 444         }
 445         return 1;
 446 }
 447
 448 static int
 449 print_v4l2_framebuffer(struct tcb *const tcp, const kernel_ulong_t arg)
 450 {
 451         struct_v4l2_framebuffer b;
 452
 453         tprints(", ");
 454         if (!umove_or_printaddr(tcp, arg, &b)) {
 455                 tprintf("{capability=%#x, flags=%#x, base=",
 456                         b.capability, b.flags);
 457                 printaddr(ptr_to_kulong(b.base));
 458                 tprints("}");
 459         }
 460
 461         return RVAL_DECODED | 1;
 462 }
 463
 464 static int
 465 print_v4l2_buf_type(struct tcb *const tcp, const kernel_ulong_t arg)
 466 {
 467         int type;
 468
 469         tprints(", ");
 470         if (!umove_or_printaddr(tcp, arg, &type)) {
 471                 tprints("[");
 472                 printxval(v4l2_buf_types, type, "V4L2_BUF_TYPE_???");
 473                 tprints("]");
 474         }
 475         return RVAL_DECODED | 1;
 476 }
 477
 478 #include "xlat/v4l2_streaming_capabilities.h"
 479 #include "xlat/v4l2_capture_modes.h"
 480
 481 static int
 482 print_v4l2_streamparm(struct tcb *const tcp, const kernel_ulong_t arg,
 483                       const bool is_get)
 484 {
 485         struct v4l2_streamparm s;
 486
 487         if (entering(tcp)) {
 488                 tprints(", ");
 489                 if (umove_or_printaddr(tcp, arg, &s))
 490                         return RVAL_DECODED | 1;
 491                 tprints("{type=");
 492                 printxval(v4l2_buf_types, s.type, "V4L2_BUF_TYPE_???");
 493                 switch (s.type) {
 494                         case V4L2_BUF_TYPE_VIDEO_CAPTURE:
 495                         case V4L2_BUF_TYPE_VIDEO_OUTPUT:
 496                                 if (is_get)
 497                                         return 0;
 498                                 tprints(", ");
 499                                 break;
 500                         default:
 501                                 tprints("}");
 502                                 return RVAL_DECODED | 1;
 503                 }
 504         } else {
 505                 if (syserror(tcp) || umove(tcp, arg, &s) < 0) {
 506                         tprints("}");
 507                         return 1;
 508                 }
 509                 tprints(is_get ? ", " : " => ");
 510         }
 511
 512         if (s.type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
 513                 tprints("parm.capture={capability=");
 514                 printflags(v4l2_streaming_capabilities,
 515                            s.parm.capture.capability, "V4L2_CAP_???");
 516
 517                 tprints(", capturemode=");
 518                 printflags(v4l2_capture_modes,
 519                            s.parm.capture.capturemode, "V4L2_MODE_???");
 520
 521                 tprintf(", timeperframe=" FMT_FRACT,
 522                         ARGS_FRACT(s.parm.capture.timeperframe));
 523
 524                 tprintf(", extendedmode=%u, readbuffers=%u}",
 525                         s.parm.capture.extendedmode,
 526                         s.parm.capture.readbuffers);
 527         } else {
 528                 tprints("parm.output={capability=");
 529                 printflags(v4l2_streaming_capabilities,
 530                            s.parm.output.capability, "V4L2_CAP_???");
 531
 532                 tprintf(", outputmode=%u", s.parm.output.outputmode);
 533
 534                 tprintf(", timeperframe=" FMT_FRACT,
 535                         ARGS_FRACT(s.parm.output.timeperframe));
 536
 537                 tprintf(", extendedmode=%u, writebuffers=%u}",
 538                         s.parm.output.extendedmode,
 539                         s.parm.output.writebuffers);
 540         }
 541         if (exiting(tcp))
 542                 tprints("}");
 543         return 1;
 544 }
 545
 546 static int
 547 print_v4l2_standard(struct tcb *const tcp, const kernel_ulong_t arg)
 548 {
 549         struct_v4l2_standard s;
 550
 551         if (entering(tcp)) {
 552                 tprints(", ");
 553                 if (umove_or_printaddr(tcp, arg, &s))
 554                         return RVAL_DECODED | 1;
 555                 tprintf("{index=%u", s.index);
 556         } else {
 557                 if (!syserror(tcp) && !umove(tcp, arg, &s)) {
 558                         PRINT_FIELD_CSTRING(", ", s, name);
 559                         tprintf(", frameperiod=" FMT_FRACT,
 560                                 ARGS_FRACT(s.frameperiod));
 561                         tprintf(", framelines=%d", s.framelines);
 562                 }
 563                 tprints("}");
 564         }
 565         return 1;
 566 }
 567
 568 #include "xlat/v4l2_input_types.h"
 569
 570 static int
 571 print_v4l2_input(struct tcb *const tcp, const kernel_ulong_t arg)
 572 {
 573         struct_v4l2_input i;
 574
 575         if (entering(tcp)) {
 576                 tprints(", ");
 577                 if (umove_or_printaddr(tcp, arg, &i))
 578                         return RVAL_DECODED | 1;
 579                 tprintf("{index=%u", i.index);
 580         } else {
 581                 if (!syserror(tcp) && !umove(tcp, arg, &i)) {
 582                         PRINT_FIELD_CSTRING(", ", i, name);
 583                         tprints(", type=");
 584                         printxval(v4l2_input_types, i.type,
 585                                   "V4L2_INPUT_TYPE_???");
 586                 }
 587                 tprints("}");
 588         }
 589         return 1;
 590 }
 591
 592 #include "xlat/v4l2_control_ids.h"
 593
 594 static int
 595 print_v4l2_control(struct tcb *const tcp, const kernel_ulong_t arg,
 596                    const bool is_get)
 597 {
 598         struct v4l2_control c;
 599
 600         if (entering(tcp)) {
 601                 tprints(", ");
 602                 if (umove_or_printaddr(tcp, arg, &c))
 603                         return RVAL_DECODED | 1;
 604                 tprints("{id=");
 605                 printxval(v4l2_control_ids, c.id, "V4L2_CID_???");
 606                 if (!is_get)
 607                         tprintf(", value=%d", c.value);
 608                 return 0;
 609         }
 610
 611         if (!syserror(tcp) && !umove(tcp, arg, &c)) {
 612                 tprints(is_get ? ", " : " => ");
 613                 tprintf("value=%d", c.value);
 614         }
 615
 616         tprints("}");
 617         return 1;
 618 }
 619
 620 #include "xlat/v4l2_tuner_types.h"
 621 #include "xlat/v4l2_tuner_capabilities.h"
 622 #include "xlat/v4l2_tuner_rxsubchanses.h"
 623 #include "xlat/v4l2_tuner_audmodes.h"
 624
 625 static int
 626 print_v4l2_tuner(struct tcb *const tcp, const kernel_ulong_t arg,
 627                  const bool is_get)
 628 {
 629         struct v4l2_tuner c;
 630         if (entering(tcp)) {
 631                 tprints(", ");
 632                 if (umove_or_printaddr(tcp, arg, &c))
 633                         return RVAL_DECODED | 1;
 634                 tprintf("{index=%u", c.index);
 635                 if (is_get)
 636                         return 0;
 637                 tprints(", ");
 638         } else {
 639                 if (syserror(tcp) || umove(tcp, arg, &c) < 0) {
 640                         tprints("}");
 641                         return 1;
 642                 }
 643                 tprints(is_get ? ", " : " => ");
 644         }
 645
 646         PRINT_FIELD_CSTRING("", c, name);
 647         tprints(", type=");
 648         printxval(v4l2_tuner_types, c.type, "V4L2_TUNER_TYPE_???");
 649         tprints(", capability=");
 650         printxval(v4l2_tuner_capabilities, c.capability,
 651                   "V4L2_TUNER_CAP_???");
 652         tprintf(", rangelow=%u, rangehigh=%u, rxsubchans=",
 653                 c.rangelow, c.rangehigh);
 654         printxval(v4l2_tuner_rxsubchanses, c.rxsubchans,
 655                   "V4L2_TUNER_SUB_???");
 656         tprints(", audmode=");
 657         printxval(v4l2_tuner_audmodes, c.audmode,
 658                   "V4L2_TUNER_MODE_???");
 659         tprintf(", signal=%d, afc=%d", c.signal, c.afc);
 660
 661         if (exiting(tcp))
 662                 tprints("}");
 663         return 1;
 664 }
 665
 666 #include "xlat/v4l2_control_types.h"
 667 #include "xlat/v4l2_control_flags.h"
 668
 669 static int
 670 print_v4l2_queryctrl(struct tcb *const tcp, const kernel_ulong_t arg)
 671 {
 672         struct v4l2_queryctrl c;
 673
 674         if (entering(tcp)) {
 675                 tprints(", ");
 676                 if (umove_or_printaddr(tcp, arg, &c))
 677                         return RVAL_DECODED | 1;
 678                 tprints("{id=");
 679         } else {
 680                 if (syserror(tcp) || umove(tcp, arg, &c) < 0) {
 681                         tprints("}");
 682                         return 1;
 683                 }
 684                 if (get_tcb_priv_ulong(tcp))
 685                         tprints(" => ");
 686         }
 687
 688         if (entering(tcp) || get_tcb_priv_ulong(tcp)) {
 689 #ifdef V4L2_CTRL_FLAG_NEXT_CTRL
 690                 const unsigned long next = c.id & V4L2_CTRL_FLAG_NEXT_CTRL;
 691                 set_tcb_priv_ulong(tcp, next);
 692                 if (next) {
 693                         tprints("V4L2_CTRL_FLAG_NEXT_CTRL|");
 694                         c.id &= ~V4L2_CTRL_FLAG_NEXT_CTRL;
 695                 }
 696 #endif
 697                 printxval(v4l2_control_ids, c.id, "V4L2_CID_???");
 698         }
 699
 700         if (exiting(tcp)) {
 701                 tprints(", type=");
 702                 printxval(v4l2_control_types, c.type, "V4L2_CTRL_TYPE_???");
 703                 PRINT_FIELD_CSTRING(", ", c, name);
 704                 tprintf(", minimum=%d, maximum=%d, step=%d"
 705                         ", default_value=%d, flags=",
 706                         c.minimum, c.maximum, c.step, c.default_value);
 707                 printflags(v4l2_control_flags, c.flags, "V4L2_CTRL_FLAG_???");
 708                 tprints("}");
 709         }
 710         return 1;
 711 }
 712
 713 static int
 714 print_v4l2_cropcap(struct tcb *const tcp, const kernel_ulong_t arg)
 715 {
 716         struct v4l2_cropcap c;
 717
 718         if (entering(tcp)) {
 719                 tprints(", ");
 720                 if (umove_or_printaddr(tcp, arg, &c))
 721                         return RVAL_DECODED | 1;
 722                 tprints("{type=");
 723                 printxval(v4l2_buf_types, c.type, "V4L2_BUF_TYPE_???");
 724                 return 0;
 725         }
 726         if (!syserror(tcp) && !umove(tcp, arg, &c)) {
 727                 tprintf(", bounds=" FMT_RECT
 728                         ", defrect=" FMT_RECT
 729                         ", pixelaspect=" FMT_FRACT,
 730                         ARGS_RECT(c.bounds),
 731                         ARGS_RECT(c.defrect),
 732                         ARGS_FRACT(c.pixelaspect));
 733         }
 734         tprints("}");
 735         return 1;
 736 }
 737
 738 static int
 739 print_v4l2_crop(struct tcb *const tcp, const kernel_ulong_t arg,
 740                 const bool is_get)
 741 {
 742         struct v4l2_crop c;
 743
 744         if (entering(tcp)) {
 745                 tprints(", ");
 746                 if (umove_or_printaddr(tcp, arg, &c))
 747                         return RVAL_DECODED | 1;
 748                 tprints("{type=");
 749                 printxval(v4l2_buf_types, c.type, "V4L2_BUF_TYPE_???");
 750                 if (is_get)
 751                         return 0;
 752                 tprintf(", c=" FMT_RECT, ARGS_RECT(c.c));
 753         } else {
 754                 if (!syserror(tcp) && !umove(tcp, arg, &c))
 755                         tprintf(", c=" FMT_RECT, ARGS_RECT(c.c));
 756         }
 757
 758         tprints("}");
 759         return RVAL_DECODED | 1;
 760 }
 761
 762 #ifdef VIDIOC_S_EXT_CTRLS
 763 static bool
 764 print_v4l2_ext_control(struct tcb *tcp, void *elem_buf, size_t elem_size, void *data)
 765 {
 766         const struct_v4l2_ext_control *p = elem_buf;
 767
 768         tprints("{id=");
 769         printxval(v4l2_control_ids, p->id, "V4L2_CID_???");
 770 # if HAVE_DECL_V4L2_CTRL_TYPE_STRING
 771         tprintf(", size=%u", p->size);
 772         if (p->size > 0) {
 773                 tprints(", string=");
 774                 printstrn(tcp, ptr_to_kulong(p->string), p->size);
 775         } else
 776 # endif
 777         tprintf(", value=%d, value64=%" PRId64, p->value, (int64_t) p->value64);
 778         tprints("}");
 779
 780         return true;
 781 }
 782
 783 #include "xlat/v4l2_control_classes.h"
 784
 785 static int
 786 print_v4l2_ext_controls(struct tcb *const tcp, const kernel_ulong_t arg,
 787                         const bool is_get)
 788 {
 789         struct_v4l2_ext_controls c;
 790
 791         if (entering(tcp)) {
 792                 tprints(", ");
 793                 if (umove_or_printaddr(tcp, arg, &c))
 794                         return RVAL_DECODED | 1;
 795                 tprints("{ctrl_class=");
 796                 printxval(v4l2_control_classes, c.ctrl_class,
 797                           "V4L2_CTRL_CLASS_???");
 798                 tprintf(", count=%u", c.count);
 799                 if (!c.count) {
 800                         tprints("}");
 801                         return RVAL_DECODED | 1;
 802                 }
 803                 if (is_get)
 804                         return 0;
 805                 tprints(", ");
 806         } else {
 807                 if (umove(tcp, arg, &c) < 0) {
 808                         tprints("}");
 809                         return 1;
 810                 }
 811                 tprints(is_get ? ", " : " => ");
 812         }
 813
 814         tprints("controls=");
 815         struct_v4l2_ext_control ctrl;
 816         bool fail = !print_array(tcp, ptr_to_kulong(c.controls), c.count,
 817                                  &ctrl, sizeof(ctrl),
 818                                  umoven_or_printaddr_ignore_syserror,
 819                                  print_v4l2_ext_control, 0);
 820
 821         if (exiting(tcp) && syserror(tcp))
 822                 tprintf(", error_idx=%u", c.error_idx);
 823
 824         if (exiting(tcp) || fail) {
 825                 tprints("}");
 826                 return RVAL_DECODED | 1;
 827         }
 828         return 1;
 829 }
 830 #endif /* VIDIOC_S_EXT_CTRLS */
 831
 832 #ifdef VIDIOC_ENUM_FRAMESIZES
 833 # include "xlat/v4l2_framesize_types.h"
 834
 835 static int
 836 print_v4l2_frmsizeenum(struct tcb *const tcp, const kernel_ulong_t arg)
 837 {
 838         struct v4l2_frmsizeenum s;
 839
 840         if (entering(tcp)) {
 841                 tprints(", ");
 842                 if (umove_or_printaddr(tcp, arg, &s))
 843                         return RVAL_DECODED | 1;
 844                 tprintf("{index=%u, pixel_format=", s.index);
 845                 print_pixelformat(s.pixel_format);
 846                 return 0;
 847         }
 848
 849         if (!syserror(tcp) && !umove(tcp, arg, &s)) {
 850                 tprints(", type=");
 851                 printxval(v4l2_framesize_types, s.type, "V4L2_FRMSIZE_TYPE_???");
 852                 switch (s.type) {
 853                 case V4L2_FRMSIZE_TYPE_DISCRETE:
 854                         tprintf(", discrete={width=%u, height=%u}",
 855                                 s.discrete.width, s.discrete.height);
 856                         break;
 857                 case V4L2_FRMSIZE_TYPE_STEPWISE:
 858                         tprintf(", stepwise={min_width=%u, max_width=%u, "
 859                                 "step_width=%u, min_height=%u, max_height=%u, "
 860                                 "step_height=%u}",
 861                                 s.stepwise.min_width, s.stepwise.max_width,
 862                                 s.stepwise.step_width, s.stepwise.min_height,
 863                                 s.stepwise.max_height, s.stepwise.step_height);
 864                         break;
 865                 }
 866         }
 867         tprints("}");
 868         return 1;
 869 }
 870 #endif /* VIDIOC_ENUM_FRAMESIZES */
 871
 872 #ifdef VIDIOC_ENUM_FRAMEINTERVALS
 873 # include "xlat/v4l2_frameinterval_types.h"
 874
 875 static int
 876 print_v4l2_frmivalenum(struct tcb *const tcp, const kernel_ulong_t arg)
 877 {
 878         struct v4l2_frmivalenum f;
 879
 880         if (entering(tcp)) {
 881                 tprints(", ");
 882                 if (umove_or_printaddr(tcp, arg, &f))
 883                         return RVAL_DECODED | 1;
 884                 tprintf("{index=%u, pixel_format=", f.index);
 885                 print_pixelformat(f.pixel_format);
 886                 tprintf(", width=%u, height=%u", f.width, f.height);
 887                 return 0;
 888         }
 889         if (!syserror(tcp) && !umove(tcp, arg, &f)) {
 890                 tprints(", type=");
 891                 printxval(v4l2_frameinterval_types, f.type,
 892                           "V4L2_FRMIVAL_TYPE_???");
 893                 switch (f.type) {
 894                 case V4L2_FRMIVAL_TYPE_DISCRETE:
 895                         tprintf(", discrete=" FMT_FRACT,
 896                                 ARGS_FRACT(f.discrete));
 897                         break;
 898                 case V4L2_FRMIVAL_TYPE_STEPWISE:
 899                 case V4L2_FRMSIZE_TYPE_CONTINUOUS:
 900                         tprintf(", stepwise={min=" FMT_FRACT ", max="
 901                                 FMT_FRACT ", step=" FMT_FRACT "}",
 902                                 ARGS_FRACT(f.stepwise.min),
 903                                 ARGS_FRACT(f.stepwise.max),
 904                                 ARGS_FRACT(f.stepwise.step));
 905                         break;
 906                 }
 907         }
 908         tprints("}");
 909         return 1;
 910 }
 911 #endif /* VIDIOC_ENUM_FRAMEINTERVALS */
 912
 913 #ifdef VIDIOC_CREATE_BUFS
 914 static int
 915 print_v4l2_create_buffers(struct tcb *const tcp, const kernel_ulong_t arg)
 916 {
 917         struct_v4l2_create_buffers b;
 918
 919         if (entering(tcp)) {
 920                 tprints(", ");
 921                 if (umove_or_printaddr(tcp, arg, &b))
 922                         return RVAL_DECODED | 1;
 923                 tprintf("{count=%u, memory=", b.count);
 924                 printxval(v4l2_memories, b.memory, "V4L2_MEMORY_???");
 925                 tprints(", format={type=");
 926                 printxval(v4l2_buf_types, b.format.type,
 927                           "V4L2_BUF_TYPE_???");
 928                 print_v4l2_format_fmt(tcp, ", ",
 929                                       (struct_v4l2_format *) &b.format);
 930                 tprints("}}");
 931                 return 0;
 932         } else {
 933                 static const char fmt[] = "{index=%u, count=%u}";
 934                 static char outstr[sizeof(fmt) + sizeof(int) * 6];
 935
 936                 if (syserror(tcp) || umove(tcp, arg, &b) < 0)
 937                         return 1;
 938                 sprintf(outstr, fmt, b.index, b.count);
 939                 tcp->auxstr = outstr;
 940                 return 1 + RVAL_STR;
 941         }
 942 }
 943 #endif /* VIDIOC_CREATE_BUFS */
 944
 945 MPERS_PRINTER_DECL(int, v4l2_ioctl, struct tcb *const tcp,
 946                    const unsigned int code, const kernel_ulong_t arg)
 947 {
 948         if (!verbose(tcp))
 949                 return RVAL_DECODED;
 950
 951         switch (code) {
 952         case VIDIOC_QUERYCAP: /* R */
 953                 return print_v4l2_capability(tcp, arg);
 954
 955         case VIDIOC_ENUM_FMT: /* RW */
 956                 return print_v4l2_fmtdesc(tcp, arg);
 957
 958         case VIDIOC_G_FMT: /* RW */
 959         case VIDIOC_S_FMT: /* RW */
 960         case VIDIOC_TRY_FMT: /* RW */
 961                 return print_v4l2_format(tcp, arg, code == VIDIOC_G_FMT);
 962
 963         case VIDIOC_REQBUFS: /* RW */
 964                 return print_v4l2_requestbuffers(tcp, arg);
 965
 966         case VIDIOC_QUERYBUF: /* RW */
 967         case VIDIOC_QBUF: /* RW */
 968         case VIDIOC_DQBUF: /* RW */
 969                 return print_v4l2_buffer(tcp, code, arg);
 970
 971         case VIDIOC_G_FBUF: /* R */
 972                 if (entering(tcp))
 973                         return 0;
 974                 /* fall through */
 975         case VIDIOC_S_FBUF: /* W */
 976                 return print_v4l2_framebuffer(tcp, arg);
 977
 978         case VIDIOC_STREAMON: /* W */
 979         case VIDIOC_STREAMOFF: /* W */
 980                 return print_v4l2_buf_type(tcp, arg);
 981
 982         case VIDIOC_G_PARM: /* RW */
 983         case VIDIOC_S_PARM: /* RW */
 984                 return print_v4l2_streamparm(tcp, arg, code == VIDIOC_G_PARM);
 985
 986         case VIDIOC_G_STD: /* R */
 987                 if (entering(tcp))
 988                         return 0;
 989                 /* fall through */
 990         case VIDIOC_S_STD: /* W */
 991                 tprints(", ");
 992                 printnum_int64(tcp, arg, "%#" PRIx64);
 993                 return RVAL_DECODED | 1;
 994
 995         case VIDIOC_ENUMSTD: /* RW */
 996                 return print_v4l2_standard(tcp, arg);
 997
 998         case VIDIOC_ENUMINPUT: /* RW */
 999                 return print_v4l2_input(tcp, arg);
1000
1001         case VIDIOC_G_CTRL: /* RW */
1002         case VIDIOC_S_CTRL: /* RW */
1003                 return print_v4l2_control(tcp, arg, code == VIDIOC_G_CTRL);
1004
1005         case VIDIOC_G_TUNER: /* RW */
1006         case VIDIOC_S_TUNER: /* RW */
1007                 return print_v4l2_tuner(tcp, arg, code == VIDIOC_G_TUNER);
1008
1009         case VIDIOC_QUERYCTRL: /* RW */
1010                 return print_v4l2_queryctrl(tcp, arg);
1011
1012         case VIDIOC_G_INPUT: /* R */
1013                 if (entering(tcp))
1014                         return 0;
1015                 /* fall through */
1016         case VIDIOC_S_INPUT: /* RW */
1017                 tprints(", ");
1018                 printnum_int(tcp, arg, "%u");
1019                 return RVAL_DECODED | 1;
1020
1021         case VIDIOC_CROPCAP: /* RW */
1022                 return print_v4l2_cropcap(tcp, arg);
1023
1024         case VIDIOC_G_CROP: /* RW */
1025         case VIDIOC_S_CROP: /* W */
1026                 return print_v4l2_crop(tcp, arg, code == VIDIOC_G_CROP);
1027
1028 #ifdef VIDIOC_S_EXT_CTRLS
1029         case VIDIOC_S_EXT_CTRLS: /* RW */
1030         case VIDIOC_TRY_EXT_CTRLS: /* RW */
1031         case VIDIOC_G_EXT_CTRLS: /* RW */
1032                 return print_v4l2_ext_controls(tcp, arg,
1033                                                code == VIDIOC_G_EXT_CTRLS);
1034 #endif /* VIDIOC_S_EXT_CTRLS */
1035
1036 #ifdef VIDIOC_ENUM_FRAMESIZES
1037         case VIDIOC_ENUM_FRAMESIZES: /* RW */
1038                 return print_v4l2_frmsizeenum(tcp, arg);
1039 #endif /* VIDIOC_ENUM_FRAMESIZES */
1040
1041 #ifdef VIDIOC_ENUM_FRAMEINTERVALS
1042         case VIDIOC_ENUM_FRAMEINTERVALS: /* RW */
1043                 return print_v4l2_frmivalenum(tcp, arg);
1044 #endif /* VIDIOC_ENUM_FRAMEINTERVALS */
1045
1046 #ifdef VIDIOC_CREATE_BUFS
1047         case VIDIOC_CREATE_BUFS: /* RW */
1048                 return print_v4l2_create_buffers(tcp, arg);
1049 #endif /* VIDIOC_CREATE_BUFS */
1050
1051         default:
1052                 return RVAL_DECODED;
1053         }
1054 }