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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 <stdint.h>
34 #include <linux/ioctl.h>
35 #include <linux/types.h>
36 #include <linux/videodev2.h>
37
38 #include DEF_MPERS_TYPE(struct_v4l2_buffer)
39 #include DEF_MPERS_TYPE(struct_v4l2_clip)
40 #ifdef VIDIOC_CREATE_BUFS
41 # include DEF_MPERS_TYPE(struct_v4l2_create_buffers)
42 #endif
43 #include DEF_MPERS_TYPE(struct_v4l2_ext_control)
44 #include DEF_MPERS_TYPE(struct_v4l2_ext_controls)
45 #include DEF_MPERS_TYPE(struct_v4l2_format)
46 #include DEF_MPERS_TYPE(struct_v4l2_framebuffer)
47 #include DEF_MPERS_TYPE(struct_v4l2_input)
48 #include DEF_MPERS_TYPE(struct_v4l2_standard)
49
50 typedef struct v4l2_buffer struct_v4l2_buffer;
51 typedef struct v4l2_clip struct_v4l2_clip;
52 #ifdef VIDIOC_CREATE_BUFS
53 typedef struct v4l2_create_buffers struct_v4l2_create_buffers;
54 #endif
55 typedef struct v4l2_ext_control struct_v4l2_ext_control;
56 typedef struct v4l2_ext_controls struct_v4l2_ext_controls;
57 typedef struct v4l2_format struct_v4l2_format;
58 typedef struct v4l2_framebuffer struct_v4l2_framebuffer;
59 typedef struct v4l2_input struct_v4l2_input;
60 typedef struct v4l2_standard struct_v4l2_standard;
61
62 #include MPERS_DEFS
63
64 #include "print_fields.h"
65 #include "xstring.h"
66
67 /* some historical constants */
68 #ifndef V4L2_CID_HCENTER
69 #define V4L2_CID_HCENTER (V4L2_CID_BASE+22)
70 #endif
71 #ifndef V4L2_CID_VCENTER
72 #define V4L2_CID_VCENTER (V4L2_CID_BASE+23)
73 #endif
74 #ifndef V4L2_CID_BAND_STOP_FILTER
75 #define V4L2_CID_BAND_STOP_FILTER (V4L2_CID_BASE+33)
76 #endif
77
78 #define FMT_FRACT "%u/%u"
79 #define ARGS_FRACT(x) ((x).numerator), ((x).denominator)
80
81 #define FMT_RECT "{left=%d, top=%d, width=%u, height=%u}"
82 #define ARGS_RECT(x) (x).left, (x).top, (x).width, (x).height
83
84 static void
85 print_pixelformat(uint32_t fourcc)
86 {
87         const union {
88                 uint32_t pixelformat;
89                 unsigned char cc[sizeof(uint32_t)];
90         } u = {
91 #if WORDS_BIGENDIAN
92                 .cc = {
93                         (unsigned char) (fourcc >> 24),
94                         (unsigned char) (fourcc >> 16),
95                         (unsigned char) (fourcc >> 8),
96                         (unsigned char) fourcc
97                 }
98 #else
99                 .pixelformat = fourcc
100 #endif
101         };
102         unsigned int i;
103
104         tprints("v4l2_fourcc(");
105         for (i = 0; i < sizeof(u.cc); ++i) {
106                 unsigned char c = u.cc[i];
107
108                 if (i)
109                         tprints(", ");
110                 if (c == '\'' || c == '\\') {
111                         char sym[] = {
112                                 '\'',
113                                 '\\',
114                                 c,
115                                 '\'',
116                                 '\0'
117                         };
118                         tprints(sym);
119                 } else if (c >= ' ' && c <= 0x7e) {
120                         char sym[] = {
121                                 '\'',
122                                 c,
123                                 '\'',
124                                 '\0'
125                         };
126                         tprints(sym);
127                 } else {
128                         char hex[] = {
129                                 '\'',
130                                 '\\',
131                                 'x',
132                                 "0123456789abcdef"[c >> 4],
133                                 "0123456789abcdef"[c & 0xf],
134                                 '\'',
135                                 '\0'
136                         };
137                         tprints(hex);
138                 }
139         }
140         tprints(")");
141 }
142
143 #include "xlat/v4l2_device_capabilities_flags.h"
144
145 static int
146 print_v4l2_capability(struct tcb *const tcp, const kernel_ulong_t arg)
147 {
148         struct v4l2_capability caps;
149
150         if (entering(tcp))
151                 return 0;
152         tprints(", ");
153         if (umove_or_printaddr(tcp, arg, &caps))
154                 return RVAL_IOCTL_DECODED;
155         PRINT_FIELD_CSTRING("{", caps, driver);
156         PRINT_FIELD_CSTRING(", ", caps, card);
157         PRINT_FIELD_CSTRING(", ", caps, bus_info);
158         tprintf(", version=%u.%u.%u, capabilities=",
159                 (caps.version >> 16) & 0xFF,
160                 (caps.version >> 8) & 0xFF,
161                 caps.version & 0xFF);
162         printflags(v4l2_device_capabilities_flags, caps.capabilities,
163                    "V4L2_CAP_???");
164 #ifdef V4L2_CAP_DEVICE_CAPS
165         tprints(", device_caps=");
166         printflags(v4l2_device_capabilities_flags, caps.device_caps,
167                    "V4L2_CAP_???");
168 #endif
169         tprints("}");
170         return RVAL_IOCTL_DECODED;
171 }
172
173 #include "xlat/v4l2_buf_types.h"
174 #include "xlat/v4l2_format_description_flags.h"
175
176 static int
177 print_v4l2_fmtdesc(struct tcb *const tcp, const kernel_ulong_t arg)
178 {
179         struct v4l2_fmtdesc f;
180
181         if (entering(tcp)) {
182                 tprints(", ");
183                 if (umove_or_printaddr(tcp, arg, &f))
184                         return RVAL_IOCTL_DECODED;
185                 tprintf("{index=%u, type=", f.index);
186                 printxval(v4l2_buf_types, f.type, "V4L2_BUF_TYPE_???");
187                 return 0;
188         }
189
190         if (!syserror(tcp) && !umove(tcp, arg, &f)) {
191                 tprints(", flags=");
192                 printflags(v4l2_format_description_flags, f.flags,
193                            "V4L2_FMT_FLAG_???");
194                 PRINT_FIELD_CSTRING(", ", f, description);
195                 tprints(", pixelformat=");
196                 print_pixelformat(f.pixelformat);
197         }
198         tprints("}");
199         return RVAL_IOCTL_DECODED;
200 }
201
202 #include "xlat/v4l2_fields.h"
203 #include "xlat/v4l2_colorspaces.h"
204 #include "xlat/v4l2_vbi_flags.h"
205 #include "xlat/v4l2_sliced_flags.h"
206
207 static bool
208 print_v4l2_clip(struct tcb *tcp, void *elem_buf, size_t elem_size, void *data)
209 {
210         const struct_v4l2_clip *p = elem_buf;
211         tprintf(FMT_RECT, ARGS_RECT(p->c));
212         return true;
213 }
214
215 static bool
216 print_v4l2_format_fmt(struct tcb *const tcp, const char *prefix,
217                       const struct_v4l2_format *f)
218 {
219         bool ret = true;
220         switch (f->type) {
221         case V4L2_BUF_TYPE_VIDEO_CAPTURE:
222         case V4L2_BUF_TYPE_VIDEO_OUTPUT:
223                 tprints(prefix);
224                 tprintf("fmt.pix={width=%u, height=%u, pixelformat=",
225                         f->fmt.pix.width, f->fmt.pix.height);
226                 print_pixelformat(f->fmt.pix.pixelformat);
227                 tprints(", field=");
228                 printxval(v4l2_fields, f->fmt.pix.field, "V4L2_FIELD_???");
229                 tprintf(", bytesperline=%u, sizeimage=%u, colorspace=",
230                         f->fmt.pix.bytesperline, f->fmt.pix.sizeimage);
231                 printxval(v4l2_colorspaces, f->fmt.pix.colorspace,
232                           "V4L2_COLORSPACE_???");
233                 tprints("}");
234                 break;
235 #if HAVE_DECL_V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE
236         case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
237         case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE: {
238                 unsigned int i, max;
239
240                 tprints(prefix);
241                 tprintf("fmt.pix_mp={width=%u, height=%u, pixelformat=",
242                         f->fmt.pix_mp.width, f->fmt.pix_mp.height);
243                 print_pixelformat(f->fmt.pix_mp.pixelformat);
244                 tprints(", field=");
245                 printxval(v4l2_fields, f->fmt.pix_mp.field, "V4L2_FIELD_???");
246                 tprints(", colorspace=");
247                 printxval(v4l2_colorspaces, f->fmt.pix_mp.colorspace,
248                           "V4L2_COLORSPACE_???");
249                 tprints(", plane_fmt=[");
250                 max = f->fmt.pix_mp.num_planes;
251                 if (max > VIDEO_MAX_PLANES)
252                         max = VIDEO_MAX_PLANES;
253                 for (i = 0; i < max; i++) {
254                         if (i > 0)
255                                 tprints(", ");
256                         tprintf("{sizeimage=%u, bytesperline=%u}",
257                                 f->fmt.pix_mp.plane_fmt[i].sizeimage,
258                                 f->fmt.pix_mp.plane_fmt[i].bytesperline);
259                 }
260                 tprintf("], num_planes=%u}",
261                         (unsigned) f->fmt.pix_mp.num_planes);
262                 break;
263         }
264 #endif
265         /* OUTPUT_OVERLAY since Linux v2.6.22-rc1~1118^2~179 */
266 #if HAVE_DECL_V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY
267         case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
268 #endif
269         case V4L2_BUF_TYPE_VIDEO_OVERLAY: {
270                 struct_v4l2_clip clip;
271                 tprints(prefix);
272                 tprintf("fmt.win={left=%d, top=%d, width=%u, height=%u, field=",
273                         ARGS_RECT(f->fmt.win.w));
274                 printxval(v4l2_fields, f->fmt.win.field, "V4L2_FIELD_???");
275                 tprintf(", chromakey=%#x, clips=", f->fmt.win.chromakey);
276                 ret = print_array(tcp, ptr_to_kulong(f->fmt.win.clips),
277                                   f->fmt.win.clipcount, &clip, sizeof(clip),
278                                   umoven_or_printaddr, print_v4l2_clip, 0);
279                 tprintf(", clipcount=%u, bitmap=", f->fmt.win.clipcount);
280                 printaddr(ptr_to_kulong(f->fmt.win.bitmap));
281 #ifdef HAVE_STRUCT_V4L2_WINDOW_GLOBAL_ALPHA
282                 tprintf(", global_alpha=%#x", f->fmt.win.global_alpha);
283 #endif
284                 tprints("}");
285                 break;
286         }
287         case V4L2_BUF_TYPE_VBI_CAPTURE:
288         case V4L2_BUF_TYPE_VBI_OUTPUT:
289                 tprints(prefix);
290                 tprintf("fmt.vbi={sampling_rate=%u, offset=%u, "
291                         "samples_per_line=%u, sample_format=",
292                         f->fmt.vbi.sampling_rate, f->fmt.vbi.offset,
293                         f->fmt.vbi.samples_per_line);
294                 print_pixelformat(f->fmt.vbi.sample_format);
295                 tprintf(", start=[%u, %u], count=[%u, %u], ",
296                         f->fmt.vbi.start[0], f->fmt.vbi.start[1],
297                         f->fmt.vbi.count[0], f->fmt.vbi.count[1]);
298                 tprints("flags=");
299                 printxval(v4l2_vbi_flags, f->fmt.vbi.flags, "V4L2_VBI_???");
300                 tprints("}");
301                 break;
302         /* both since Linux v2.6.14-rc2~64 */
303 #if HAVE_DECL_V4L2_BUF_TYPE_SLICED_VBI_CAPTURE
304         case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
305         case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT: {
306                 unsigned int i, j;
307
308                 tprints(prefix);
309                 tprints("fmt.sliced={service_set=");
310                 printxval(v4l2_sliced_flags, f->fmt.sliced.service_set,
311                         "V4L2_SLICED_???");
312                 tprintf(", io_size=%u, service_lines=[",
313                         f->fmt.sliced.io_size);
314                 for (i = 0; i < ARRAY_SIZE(f->fmt.sliced.service_lines); i++) {
315                         if (i > 0)
316                                 tprints(", ");
317                         tprints("[");
318                         for (j = 0;
319                              j < ARRAY_SIZE(f->fmt.sliced.service_lines[0]);
320                              j++) {
321                                 if (j > 0)
322                                         tprints(", ");
323                                 tprintf("%#x",
324                                         f->fmt.sliced.service_lines[i][j]);
325                         }
326                         tprints("]");
327                 }
328                 tprints("]}");
329                 break;
330         }
331 #endif
332         /* since Linux v4.4-rc1~118^2~14 */
333 #if HAVE_DECL_V4L2_BUF_TYPE_SDR_OUTPUT
334         case V4L2_BUF_TYPE_SDR_OUTPUT:
335 #endif
336         /* since Linux v3.15-rc1~85^2~213 */
337 #if HAVE_DECL_V4L2_BUF_TYPE_SDR_CAPTURE
338         case V4L2_BUF_TYPE_SDR_CAPTURE:
339                 tprints(prefix);
340                 tprints("fmt.sdr={pixelformat=");
341                 print_pixelformat(f->fmt.sdr.pixelformat);
342 #ifdef HAVE_STRUCT_V4L2_SDR_FORMAT_BUFFERSIZE
343                 tprintf(", buffersize=%u",
344                         f->fmt.sdr.buffersize);
345 #endif
346                 tprints("}");
347                 break;
348 #endif
349         }
350         return ret;
351 }
352
353 static int
354 print_v4l2_format(struct tcb *const tcp, const kernel_ulong_t arg,
355                   const bool is_get)
356 {
357         struct_v4l2_format f;
358
359         if (entering(tcp)) {
360                 tprints(", ");
361                 if (umove_or_printaddr(tcp, arg, &f))
362                         return RVAL_IOCTL_DECODED;
363                 tprints("{type=");
364                 printxval(v4l2_buf_types, f.type, "V4L2_BUF_TYPE_???");
365                 if (is_get)
366                         return 0;
367                 if (!print_v4l2_format_fmt(tcp, ", ", &f)) {
368                         tprints("}");
369                         return RVAL_IOCTL_DECODED;
370                 }
371
372                 return 0;
373         }
374
375         if (!syserror(tcp) && !umove(tcp, arg, &f))
376                 print_v4l2_format_fmt(tcp, is_get ? ", " : " => ", &f);
377
378         tprints("}");
379
380         return RVAL_IOCTL_DECODED;
381 }
382
383 #include "xlat/v4l2_memories.h"
384
385 static int
386 print_v4l2_requestbuffers(struct tcb *const tcp, const kernel_ulong_t arg)
387 {
388         struct v4l2_requestbuffers reqbufs;
389
390         if (entering(tcp)) {
391                 tprints(", ");
392
393                 if (umove_or_printaddr(tcp, arg, &reqbufs))
394                         return RVAL_IOCTL_DECODED;
395
396                 tprintf("{type=");
397                 printxval(v4l2_buf_types, reqbufs.type, "V4L2_BUF_TYPE_???");
398                 tprints(", memory=");
399                 printxval(v4l2_memories, reqbufs.memory, "V4L2_MEMORY_???");
400                 tprintf(", count=%u", reqbufs.count);
401
402                 return 0;
403         }
404
405         if (!syserror(tcp)) {
406                 tprints(" => ");
407
408                 if (!umove(tcp, arg, &reqbufs))
409                         tprintf("%u", reqbufs.count);
410                 else
411                         tprints("???");
412         }
413
414         tprints("}");
415
416         return RVAL_IOCTL_DECODED;
417 }
418
419 #include "xlat/v4l2_buf_flags.h"
420
421 static int
422 print_v4l2_buffer(struct tcb *const tcp, const unsigned int code,
423                   const kernel_ulong_t arg)
424 {
425         struct_v4l2_buffer b;
426
427         if (entering(tcp)) {
428                 tprints(", ");
429                 if (umove_or_printaddr(tcp, arg, &b))
430                         return RVAL_IOCTL_DECODED;
431                 tprints("{type=");
432                 printxval(v4l2_buf_types, b.type, "V4L2_BUF_TYPE_???");
433                 if (code != VIDIOC_DQBUF)
434                         tprintf(", index=%u", b.index);
435
436                 return 0;
437         }
438
439         if (!syserror(tcp) && !umove(tcp, arg, &b)) {
440                 if (code == VIDIOC_DQBUF)
441                         tprintf(", index=%u", b.index);
442                 tprints(", memory=");
443                 printxval(v4l2_memories, b.memory, "V4L2_MEMORY_???");
444
445                 if (b.memory == V4L2_MEMORY_MMAP) {
446                         tprintf(", m.offset=%#x", b.m.offset);
447                 } else if (b.memory == V4L2_MEMORY_USERPTR) {
448                         tprints(", m.userptr=");
449                         printaddr(b.m.userptr);
450                 }
451
452                 tprintf(", length=%u, bytesused=%u, flags=",
453                         b.length, b.bytesused);
454                 printflags(v4l2_buf_flags, b.flags, "V4L2_BUF_FLAG_???");
455                 if (code == VIDIOC_DQBUF) {
456                         tprints(", timestamp = ");
457                         MPERS_FUNC_NAME(print_struct_timeval)(&b.timestamp);
458                 }
459                 tprints(", ...");
460         }
461
462         tprints("}");
463
464         return RVAL_IOCTL_DECODED;
465 }
466
467 static int
468 print_v4l2_framebuffer(struct tcb *const tcp, const kernel_ulong_t arg)
469 {
470         struct_v4l2_framebuffer b;
471
472         tprints(", ");
473         if (!umove_or_printaddr(tcp, arg, &b)) {
474                 tprintf("{capability=%#x, flags=%#x, base=",
475                         b.capability, b.flags);
476                 printaddr(ptr_to_kulong(b.base));
477                 tprints("}");
478         }
479
480         return RVAL_IOCTL_DECODED;
481 }
482
483 static int
484 print_v4l2_buf_type(struct tcb *const tcp, const kernel_ulong_t arg)
485 {
486         int type;
487
488         tprints(", ");
489         if (!umove_or_printaddr(tcp, arg, &type)) {
490                 tprints("[");
491                 printxval(v4l2_buf_types, type, "V4L2_BUF_TYPE_???");
492                 tprints("]");
493         }
494         return RVAL_IOCTL_DECODED;
495 }
496
497 #include "xlat/v4l2_streaming_capabilities.h"
498 #include "xlat/v4l2_capture_modes.h"
499
500 static int
501 print_v4l2_streamparm(struct tcb *const tcp, const kernel_ulong_t arg,
502                       const bool is_get)
503 {
504         struct v4l2_streamparm s;
505
506         if (entering(tcp)) {
507                 tprints(", ");
508                 if (umove_or_printaddr(tcp, arg, &s))
509                         return RVAL_IOCTL_DECODED;
510                 tprints("{type=");
511                 printxval(v4l2_buf_types, s.type, "V4L2_BUF_TYPE_???");
512                 switch (s.type) {
513                         case V4L2_BUF_TYPE_VIDEO_CAPTURE:
514                         case V4L2_BUF_TYPE_VIDEO_OUTPUT:
515                                 if (is_get)
516                                         return 0;
517                                 tprints(", ");
518                                 break;
519                         default:
520                                 tprints("}");
521                                 return RVAL_IOCTL_DECODED;
522                 }
523         } else {
524                 if (syserror(tcp) || umove(tcp, arg, &s) < 0) {
525                         tprints("}");
526                         return RVAL_IOCTL_DECODED;
527                 }
528                 tprints(is_get ? ", " : " => ");
529         }
530
531         if (s.type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
532                 tprints("parm.capture={capability=");
533                 printflags(v4l2_streaming_capabilities,
534                            s.parm.capture.capability, "V4L2_CAP_???");
535
536                 tprints(", capturemode=");
537                 printflags(v4l2_capture_modes,
538                            s.parm.capture.capturemode, "V4L2_MODE_???");
539
540                 tprintf(", timeperframe=" FMT_FRACT,
541                         ARGS_FRACT(s.parm.capture.timeperframe));
542
543                 tprintf(", extendedmode=%u, readbuffers=%u}",
544                         s.parm.capture.extendedmode,
545                         s.parm.capture.readbuffers);
546         } else {
547                 tprints("parm.output={capability=");
548                 printflags(v4l2_streaming_capabilities,
549                            s.parm.output.capability, "V4L2_CAP_???");
550
551                 tprintf(", outputmode=%u", s.parm.output.outputmode);
552
553                 tprintf(", timeperframe=" FMT_FRACT,
554                         ARGS_FRACT(s.parm.output.timeperframe));
555
556                 tprintf(", extendedmode=%u, writebuffers=%u}",
557                         s.parm.output.extendedmode,
558                         s.parm.output.writebuffers);
559         }
560         if (entering(tcp)) {
561                 return 0;
562         } else {
563                 tprints("}");
564                 return RVAL_IOCTL_DECODED;
565         }
566 }
567
568 static int
569 print_v4l2_standard(struct tcb *const tcp, const kernel_ulong_t arg)
570 {
571         struct_v4l2_standard s;
572
573         if (entering(tcp)) {
574                 tprints(", ");
575                 if (umove_or_printaddr(tcp, arg, &s))
576                         return RVAL_IOCTL_DECODED;
577                 tprintf("{index=%u", s.index);
578
579                 return 0;
580         }
581
582         if (!syserror(tcp) && !umove(tcp, arg, &s)) {
583                 PRINT_FIELD_CSTRING(", ", s, name);
584                 tprintf(", frameperiod=" FMT_FRACT,
585                         ARGS_FRACT(s.frameperiod));
586                 tprintf(", framelines=%d", s.framelines);
587         }
588
589         tprints("}");
590
591         return RVAL_IOCTL_DECODED;
592 }
593
594 #include "xlat/v4l2_input_types.h"
595
596 static int
597 print_v4l2_input(struct tcb *const tcp, const kernel_ulong_t arg)
598 {
599         struct_v4l2_input i;
600
601         if (entering(tcp)) {
602                 tprints(", ");
603                 if (umove_or_printaddr(tcp, arg, &i))
604                         return RVAL_IOCTL_DECODED;
605                 tprintf("{index=%u", i.index);
606
607                 return 0;
608         }
609
610         if (!syserror(tcp) && !umove(tcp, arg, &i)) {
611                 PRINT_FIELD_CSTRING(", ", i, name);
612                 tprints(", type=");
613                 printxval(v4l2_input_types, i.type, "V4L2_INPUT_TYPE_???");
614         }
615
616         tprints("}");
617
618         return RVAL_IOCTL_DECODED;
619 }
620
621 #include "xlat/v4l2_control_ids.h"
622
623 static int
624 print_v4l2_control(struct tcb *const tcp, const kernel_ulong_t arg,
625                    const bool is_get)
626 {
627         struct v4l2_control c;
628
629         if (entering(tcp)) {
630                 tprints(", ");
631                 if (umove_or_printaddr(tcp, arg, &c))
632                         return RVAL_IOCTL_DECODED;
633                 tprints("{id=");
634                 printxval(v4l2_control_ids, c.id, "V4L2_CID_???");
635                 if (!is_get)
636                         tprintf(", value=%d", c.value);
637                 return 0;
638         }
639
640         if (!syserror(tcp) && !umove(tcp, arg, &c)) {
641                 tprints(is_get ? ", " : " => ");
642                 tprintf("value=%d", c.value);
643         }
644
645         tprints("}");
646
647         return RVAL_IOCTL_DECODED;
648 }
649
650 #include "xlat/v4l2_tuner_types.h"
651 #include "xlat/v4l2_tuner_capabilities.h"
652 #include "xlat/v4l2_tuner_rxsubchanses.h"
653 #include "xlat/v4l2_tuner_audmodes.h"
654
655 static int
656 print_v4l2_tuner(struct tcb *const tcp, const kernel_ulong_t arg,
657                  const bool is_get)
658 {
659         struct v4l2_tuner c;
660         if (entering(tcp)) {
661                 tprints(", ");
662                 if (umove_or_printaddr(tcp, arg, &c))
663                         return RVAL_IOCTL_DECODED;
664                 tprintf("{index=%u", c.index);
665                 if (is_get)
666                         return 0;
667                 tprints(", ");
668         } else {
669                 if (syserror(tcp) || umove(tcp, arg, &c) < 0) {
670                         tprints("}");
671                         return RVAL_IOCTL_DECODED;
672                 }
673                 tprints(is_get ? ", " : " => ");
674         }
675
676         PRINT_FIELD_CSTRING("", c, name);
677         tprints(", type=");
678         printxval(v4l2_tuner_types, c.type, "V4L2_TUNER_TYPE_???");
679         tprints(", capability=");
680         printxval(v4l2_tuner_capabilities, c.capability,
681                   "V4L2_TUNER_CAP_???");
682         tprintf(", rangelow=%u, rangehigh=%u, rxsubchans=",
683                 c.rangelow, c.rangehigh);
684         printxval(v4l2_tuner_rxsubchanses, c.rxsubchans,
685                   "V4L2_TUNER_SUB_???");
686         tprints(", audmode=");
687         printxval(v4l2_tuner_audmodes, c.audmode,
688                   "V4L2_TUNER_MODE_???");
689         tprintf(", signal=%d, afc=%d", c.signal, c.afc);
690
691         if (entering(tcp)) {
692                 return 0;
693         } else {
694                 tprints("}");
695                 return RVAL_IOCTL_DECODED;
696         }
697 }
698
699 #include "xlat/v4l2_control_types.h"
700 #include "xlat/v4l2_control_flags.h"
701
702 static int
703 print_v4l2_queryctrl(struct tcb *const tcp, const kernel_ulong_t arg)
704 {
705         struct v4l2_queryctrl c;
706
707         if (entering(tcp)) {
708                 tprints(", ");
709                 if (umove_or_printaddr(tcp, arg, &c))
710                         return RVAL_IOCTL_DECODED;
711                 tprints("{id=");
712         } else {
713                 if (syserror(tcp) || umove(tcp, arg, &c) < 0) {
714                         tprints("}");
715                         return RVAL_IOCTL_DECODED;
716                 }
717                 if (get_tcb_priv_ulong(tcp))
718                         tprints(" => ");
719         }
720
721         if (entering(tcp) || get_tcb_priv_ulong(tcp)) {
722 #ifdef V4L2_CTRL_FLAG_NEXT_CTRL
723                 const unsigned long next = c.id & V4L2_CTRL_FLAG_NEXT_CTRL;
724                 set_tcb_priv_ulong(tcp, next);
725                 if (next) {
726                         tprints("V4L2_CTRL_FLAG_NEXT_CTRL|");
727                         c.id &= ~V4L2_CTRL_FLAG_NEXT_CTRL;
728                 }
729 #endif
730                 printxval(v4l2_control_ids, c.id, "V4L2_CID_???");
731         }
732
733         if (exiting(tcp)) {
734                 tprints(", type=");
735                 printxval(v4l2_control_types, c.type, "V4L2_CTRL_TYPE_???");
736                 PRINT_FIELD_CSTRING(", ", c, name);
737                 tprintf(", minimum=%d, maximum=%d, step=%d"
738                         ", default_value=%d, flags=",
739                         c.minimum, c.maximum, c.step, c.default_value);
740                 printflags(v4l2_control_flags, c.flags, "V4L2_CTRL_FLAG_???");
741                 tprints("}");
742         }
743         return entering(tcp) ? 0 : RVAL_IOCTL_DECODED;
744 }
745
746 static int
747 print_v4l2_cropcap(struct tcb *const tcp, const kernel_ulong_t arg)
748 {
749         struct v4l2_cropcap c;
750
751         if (entering(tcp)) {
752                 tprints(", ");
753                 if (umove_or_printaddr(tcp, arg, &c))
754                         return RVAL_IOCTL_DECODED;
755                 tprints("{type=");
756                 printxval(v4l2_buf_types, c.type, "V4L2_BUF_TYPE_???");
757
758                 return 0;
759         }
760
761         if (!syserror(tcp) && !umove(tcp, arg, &c)) {
762                 tprintf(", bounds=" FMT_RECT
763                         ", defrect=" FMT_RECT
764                         ", pixelaspect=" FMT_FRACT,
765                         ARGS_RECT(c.bounds),
766                         ARGS_RECT(c.defrect),
767                         ARGS_FRACT(c.pixelaspect));
768         }
769
770         tprints("}");
771
772         return RVAL_IOCTL_DECODED;
773 }
774
775 static int
776 print_v4l2_crop(struct tcb *const tcp, const kernel_ulong_t arg,
777                 const bool is_get)
778 {
779         struct v4l2_crop c;
780
781         if (entering(tcp)) {
782                 tprints(", ");
783                 if (umove_or_printaddr(tcp, arg, &c))
784                         return RVAL_IOCTL_DECODED;
785                 tprints("{type=");
786                 printxval(v4l2_buf_types, c.type, "V4L2_BUF_TYPE_???");
787                 if (is_get)
788                         return 0;
789                 tprintf(", c=" FMT_RECT, ARGS_RECT(c.c));
790         } else {
791                 if (!syserror(tcp) && !umove(tcp, arg, &c))
792                         tprintf(", c=" FMT_RECT, ARGS_RECT(c.c));
793         }
794
795         tprints("}");
796
797         return RVAL_IOCTL_DECODED;
798 }
799
800 #ifdef VIDIOC_S_EXT_CTRLS
801 static bool
802 print_v4l2_ext_control(struct tcb *tcp, void *elem_buf, size_t elem_size, void *data)
803 {
804         const struct_v4l2_ext_control *p = elem_buf;
805
806         tprints("{id=");
807         printxval(v4l2_control_ids, p->id, "V4L2_CID_???");
808 # if HAVE_DECL_V4L2_CTRL_TYPE_STRING
809         tprintf(", size=%u", p->size);
810         if (p->size > 0) {
811                 tprints(", string=");
812                 printstrn(tcp, ptr_to_kulong(p->string), p->size);
813         } else
814 # endif
815         tprintf(", value=%d, value64=%" PRId64, p->value, (int64_t) p->value64);
816         tprints("}");
817
818         return true;
819 }
820
821 #include "xlat/v4l2_control_classes.h"
822
823 static int
824 print_v4l2_ext_controls(struct tcb *const tcp, const kernel_ulong_t arg,
825                         const bool is_get)
826 {
827         struct_v4l2_ext_controls c;
828
829         if (entering(tcp)) {
830                 tprints(", ");
831                 if (umove_or_printaddr(tcp, arg, &c))
832                         return RVAL_IOCTL_DECODED;
833                 tprints("{ctrl_class=");
834                 printxval(v4l2_control_classes, c.ctrl_class,
835                           "V4L2_CTRL_CLASS_???");
836                 tprintf(", count=%u", c.count);
837                 if (!c.count) {
838                         tprints("}");
839                         return RVAL_IOCTL_DECODED;
840                 }
841                 if (is_get)
842                         return 0;
843                 tprints(", ");
844         } else {
845                 if (umove(tcp, arg, &c) < 0) {
846                         tprints("}");
847                         return RVAL_IOCTL_DECODED;
848                 }
849                 tprints(is_get ? ", " : " => ");
850         }
851
852         tprints("controls=");
853         struct_v4l2_ext_control ctrl;
854         bool fail = !print_array(tcp, ptr_to_kulong(c.controls), c.count,
855                                  &ctrl, sizeof(ctrl),
856                                  umoven_or_printaddr_ignore_syserror,
857                                  print_v4l2_ext_control, 0);
858
859         if (exiting(tcp) && syserror(tcp))
860                 tprintf(", error_idx=%u", c.error_idx);
861
862         if (exiting(tcp) || fail) {
863                 tprints("}");
864                 return RVAL_IOCTL_DECODED;
865         }
866
867         /* entering */
868         return 0;
869 }
870 #endif /* VIDIOC_S_EXT_CTRLS */
871
872 #ifdef VIDIOC_ENUM_FRAMESIZES
873 # include "xlat/v4l2_framesize_types.h"
874
875 static int
876 print_v4l2_frmsizeenum(struct tcb *const tcp, const kernel_ulong_t arg)
877 {
878         struct v4l2_frmsizeenum s;
879
880         if (entering(tcp)) {
881                 tprints(", ");
882                 if (umove_or_printaddr(tcp, arg, &s))
883                         return RVAL_IOCTL_DECODED;
884                 tprintf("{index=%u, pixel_format=", s.index);
885                 print_pixelformat(s.pixel_format);
886                 return 0;
887         }
888
889         if (!syserror(tcp) && !umove(tcp, arg, &s)) {
890                 tprints(", type=");
891                 printxval(v4l2_framesize_types, s.type, "V4L2_FRMSIZE_TYPE_???");
892                 switch (s.type) {
893                 case V4L2_FRMSIZE_TYPE_DISCRETE:
894                         tprintf(", discrete={width=%u, height=%u}",
895                                 s.discrete.width, s.discrete.height);
896                         break;
897                 case V4L2_FRMSIZE_TYPE_STEPWISE:
898                         tprintf(", stepwise={min_width=%u, max_width=%u, "
899                                 "step_width=%u, min_height=%u, max_height=%u, "
900                                 "step_height=%u}",
901                                 s.stepwise.min_width, s.stepwise.max_width,
902                                 s.stepwise.step_width, s.stepwise.min_height,
903                                 s.stepwise.max_height, s.stepwise.step_height);
904                         break;
905                 }
906         }
907         tprints("}");
908         return RVAL_IOCTL_DECODED;
909 }
910 #endif /* VIDIOC_ENUM_FRAMESIZES */
911
912 #ifdef VIDIOC_ENUM_FRAMEINTERVALS
913 # include "xlat/v4l2_frameinterval_types.h"
914
915 static int
916 print_v4l2_frmivalenum(struct tcb *const tcp, const kernel_ulong_t arg)
917 {
918         struct v4l2_frmivalenum f;
919
920         if (entering(tcp)) {
921                 tprints(", ");
922                 if (umove_or_printaddr(tcp, arg, &f))
923                         return RVAL_IOCTL_DECODED;
924                 tprintf("{index=%u, pixel_format=", f.index);
925                 print_pixelformat(f.pixel_format);
926                 tprintf(", width=%u, height=%u", f.width, f.height);
927                 return 0;
928         }
929
930         if (!syserror(tcp) && !umove(tcp, arg, &f)) {
931                 tprints(", type=");
932                 printxval(v4l2_frameinterval_types, f.type,
933                           "V4L2_FRMIVAL_TYPE_???");
934                 switch (f.type) {
935                 case V4L2_FRMIVAL_TYPE_DISCRETE:
936                         tprintf(", discrete=" FMT_FRACT,
937                                 ARGS_FRACT(f.discrete));
938                         break;
939                 case V4L2_FRMIVAL_TYPE_STEPWISE:
940                 case V4L2_FRMSIZE_TYPE_CONTINUOUS:
941                         tprintf(", stepwise={min=" FMT_FRACT ", max="
942                                 FMT_FRACT ", step=" FMT_FRACT "}",
943                                 ARGS_FRACT(f.stepwise.min),
944                                 ARGS_FRACT(f.stepwise.max),
945                                 ARGS_FRACT(f.stepwise.step));
946                         break;
947                 }
948         }
949
950         tprints("}");
951
952         return RVAL_IOCTL_DECODED;
953 }
954 #endif /* VIDIOC_ENUM_FRAMEINTERVALS */
955
956 #ifdef VIDIOC_CREATE_BUFS
957 static int
958 print_v4l2_create_buffers(struct tcb *const tcp, const kernel_ulong_t arg)
959 {
960         static const char fmt[] = "{index=%u, count=%u}";
961         static char outstr[sizeof(fmt) + sizeof(int) * 6];
962
963         struct_v4l2_create_buffers b;
964
965         if (entering(tcp)) {
966                 tprints(", ");
967                 if (umove_or_printaddr(tcp, arg, &b))
968                         return RVAL_IOCTL_DECODED;
969                 tprintf("{count=%u, memory=", b.count);
970                 printxval(v4l2_memories, b.memory, "V4L2_MEMORY_???");
971                 tprints(", format={type=");
972                 printxval(v4l2_buf_types, b.format.type,
973                           "V4L2_BUF_TYPE_???");
974                 print_v4l2_format_fmt(tcp, ", ",
975                                       (struct_v4l2_format *) &b.format);
976                 tprints("}}");
977                 return 0;
978         }
979
980         if (syserror(tcp) || umove(tcp, arg, &b))
981                 return RVAL_IOCTL_DECODED;
982
983         xsprintf(outstr, fmt, b.index, b.count);
984         tcp->auxstr = outstr;
985
986         return RVAL_IOCTL_DECODED | RVAL_STR;
987 }
988 #endif /* VIDIOC_CREATE_BUFS */
989
990 MPERS_PRINTER_DECL(int, v4l2_ioctl, struct tcb *const tcp,
991                    const unsigned int code, const kernel_ulong_t arg)
992 {
993         if (!verbose(tcp))
994                 return RVAL_DECODED;
995
996         switch (code) {
997         case VIDIOC_QUERYCAP: /* R */
998                 return print_v4l2_capability(tcp, arg);
999
1000         case VIDIOC_ENUM_FMT: /* RW */
1001                 return print_v4l2_fmtdesc(tcp, arg);
1002
1003         case VIDIOC_G_FMT: /* RW */
1004         case VIDIOC_S_FMT: /* RW */
1005         case VIDIOC_TRY_FMT: /* RW */
1006                 return print_v4l2_format(tcp, arg, code == VIDIOC_G_FMT);
1007
1008         case VIDIOC_REQBUFS: /* RW */
1009                 return print_v4l2_requestbuffers(tcp, arg);
1010
1011         case VIDIOC_QUERYBUF: /* RW */
1012         case VIDIOC_QBUF: /* RW */
1013         case VIDIOC_DQBUF: /* RW */
1014                 return print_v4l2_buffer(tcp, code, arg);
1015
1016         case VIDIOC_G_FBUF: /* R */
1017                 if (entering(tcp))
1018                         return 0;
1019                 /* fall through */
1020         case VIDIOC_S_FBUF: /* W */
1021                 return print_v4l2_framebuffer(tcp, arg);
1022
1023         case VIDIOC_STREAMON: /* W */
1024         case VIDIOC_STREAMOFF: /* W */
1025                 return print_v4l2_buf_type(tcp, arg);
1026
1027         case VIDIOC_G_PARM: /* RW */
1028         case VIDIOC_S_PARM: /* RW */
1029                 return print_v4l2_streamparm(tcp, arg, code == VIDIOC_G_PARM);
1030
1031         case VIDIOC_G_STD: /* R */
1032                 if (entering(tcp))
1033                         return 0;
1034                 /* fall through */
1035         case VIDIOC_S_STD: /* W */
1036                 tprints(", ");
1037                 printnum_int64(tcp, arg, "%#" PRIx64);
1038                 break;
1039
1040         case VIDIOC_ENUMSTD: /* RW */
1041                 return print_v4l2_standard(tcp, arg);
1042
1043         case VIDIOC_ENUMINPUT: /* RW */
1044                 return print_v4l2_input(tcp, arg);
1045
1046         case VIDIOC_G_CTRL: /* RW */
1047         case VIDIOC_S_CTRL: /* RW */
1048                 return print_v4l2_control(tcp, arg, code == VIDIOC_G_CTRL);
1049
1050         case VIDIOC_G_TUNER: /* RW */
1051         case VIDIOC_S_TUNER: /* RW */
1052                 return print_v4l2_tuner(tcp, arg, code == VIDIOC_G_TUNER);
1053
1054         case VIDIOC_QUERYCTRL: /* RW */
1055                 return print_v4l2_queryctrl(tcp, arg);
1056
1057         case VIDIOC_G_INPUT: /* R */
1058                 if (entering(tcp))
1059                         return 0;
1060                 /* fall through */
1061         case VIDIOC_S_INPUT: /* RW */
1062                 tprints(", ");
1063                 printnum_int(tcp, arg, "%u");
1064                 break;
1065
1066         case VIDIOC_CROPCAP: /* RW */
1067                 return print_v4l2_cropcap(tcp, arg);
1068
1069         case VIDIOC_G_CROP: /* RW */
1070         case VIDIOC_S_CROP: /* W */
1071                 return print_v4l2_crop(tcp, arg, code == VIDIOC_G_CROP);
1072
1073 #ifdef VIDIOC_S_EXT_CTRLS
1074         case VIDIOC_S_EXT_CTRLS: /* RW */
1075         case VIDIOC_TRY_EXT_CTRLS: /* RW */
1076         case VIDIOC_G_EXT_CTRLS: /* RW */
1077                 return print_v4l2_ext_controls(tcp, arg,
1078                                                code == VIDIOC_G_EXT_CTRLS);
1079 #endif /* VIDIOC_S_EXT_CTRLS */
1080
1081 #ifdef VIDIOC_ENUM_FRAMESIZES
1082         case VIDIOC_ENUM_FRAMESIZES: /* RW */
1083                 return print_v4l2_frmsizeenum(tcp, arg);
1084 #endif /* VIDIOC_ENUM_FRAMESIZES */
1085
1086 #ifdef VIDIOC_ENUM_FRAMEINTERVALS
1087         case VIDIOC_ENUM_FRAMEINTERVALS: /* RW */
1088                 return print_v4l2_frmivalenum(tcp, arg);
1089 #endif /* VIDIOC_ENUM_FRAMEINTERVALS */
1090
1091 #ifdef VIDIOC_CREATE_BUFS
1092         case VIDIOC_CREATE_BUFS: /* RW */
1093                 return print_v4l2_create_buffers(tcp, arg);
1094 #endif /* VIDIOC_CREATE_BUFS */
1095
1096         default:
1097                 return RVAL_DECODED;
1098         }
1099
1100         return RVAL_IOCTL_DECODED;
1101 }