media.c

   1 /*
   2  * Media controller test application
   3  *
   4  * Copyright (C) 2010 Ideas on board SPRL <laurent.pinchart@ideasonboard.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; if not, write to the Free Software Foundation, Inc.,
  18  */
  19
  20 #include <sys/ioctl.h>
  21 #include <sys/stat.h>
  22 #include <sys/types.h>
  23
  24 #include <unistd.h>
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <fcntl.h>
  29 #include <errno.h>
  30
  31 #include <linux/videodev2.h>
  32 #include <linux/media.h>
  33
  34 #include "media.h"
  35 #include "subdev.h"
  36 #include "tools.h"
  37
  38 static const char *media_entity_type_to_string(unsigned type)
  39 {
  40         static const struct {
  41                 __u32 type;
  42                 const char *name;
  43         } types[] = {
  44                 { MEDIA_ENTITY_TYPE_NODE, "Node" },
  45                 { MEDIA_ENTITY_TYPE_SUBDEV, "V4L2 subdev" },
  46         };
  47
  48         unsigned int i;
  49
  50         for (i = 0; i < ARRAY_SIZE(types); i++) {
  51                 if (types[i].type == type)
  52                         return types[i].name;
  53         }
  54
  55         return "Unknown";
  56 }
  57
  58 static const char *media_entity_subtype_to_string(unsigned type, unsigned subtype)
  59 {
  60         static const char *node_types[] = {
  61                 "Unknown",
  62                 "V4L",
  63                 "FB",
  64                 "ALSA",
  65                 "DVB",
  66         };
  67         static const char *subdev_types[] = {
  68                 "Unknown",
  69                 "Video Decoder",
  70                 "Video Encoder",
  71                 "Miscellaneous",
  72         };
  73
  74         switch (type) {
  75         case MEDIA_ENTITY_TYPE_NODE:
  76                 if (subtype > 4)
  77                         subtype = 0;
  78                 return node_types[subtype];
  79
  80         case MEDIA_ENTITY_TYPE_SUBDEV:
  81                 if (subtype > 3)
  82                         subtype = 0;
  83                 return subdev_types[subtype];
  84         default:
  85                 return node_types[0];
  86         }
  87 }
  88
  89 static const char *media_pad_type_to_string(unsigned type)
  90 {
  91         static const struct {
  92                 __u32 type;
  93                 const char *name;
  94         } types[] = {
  95                 { MEDIA_PAD_TYPE_INPUT, "Input" },
  96                 { MEDIA_PAD_TYPE_OUTPUT, "Output" },
  97         };
  98
  99         unsigned int i;
 100
 101         for (i = 0; i < ARRAY_SIZE(types); i++) {
 102                 if (types[i].type == type)
 103                         return types[i].name;
 104         }
 105
 106         return "Unknown";
 107 }
 108
 109 /*
 110  * media_entity_remote_pad -
 111  */
 112 struct media_entity_pad *media_entity_remote_pad(struct media_entity_pad *pad)
 113 {
 114         unsigned int i;
 115
 116         for (i = 0; i < pad->entity->info.links; ++i) {
 117                 struct media_entity_link *link = &pad->entity->links[i];
 118
 119                 if (!(link->flags & MEDIA_LINK_FLAG_ACTIVE))
 120                         continue;
 121
 122                 if (link->source == pad)
 123                         return link->sink;
 124
 125                 if (link->sink == pad)
 126                         return link->source;
 127         }
 128
 129         return NULL;
 130 }
 131
 132 /*
 133  * media_entity_by_name -
 134  */
 135 struct media_entity *media_get_entity_by_name(struct media_device *media,
 136                                               const char *name, size_t length)
 137 {
 138         unsigned int i;
 139
 140         for (i = 0; i < media->entities_count; ++i) {
 141                 struct media_entity *entity = &media->entities[i];
 142
 143                 if (strncmp(entity->info.name, name, length) == 0)
 144                         return entity;
 145         }
 146
 147         return NULL;
 148 }
 149
 150 /*
 151  * media_setup_link -
 152  */
 153 int media_setup_link(struct media_device *media,
 154                      struct media_entity_pad *source,
 155                      struct media_entity_pad *sink,
 156                      __u32 flags)
 157 {
 158         struct media_entity_link *link;
 159         struct media_user_link ulink;
 160         unsigned int i;
 161         int ret;
 162
 163         for (i = 0; i < source->entity->info.links; i++) {
 164                 link = &source->entity->links[i];
 165
 166                 if (link->source->entity == source->entity &&
 167                     link->source->index == source->index &&
 168                     link->sink->entity == sink->entity &&
 169                     link->sink->index == sink->index)
 170                         break;
 171         }
 172
 173         if (i == source->entity->info.links) {
 174                 printf("%s: Link not found\n", __func__);
 175                 return -EINVAL;
 176         }
 177
 178         /* source pad */
 179         ulink.source.entity = source->entity->info.id;
 180         ulink.source.index = source->index;
 181         ulink.source.type = MEDIA_PAD_TYPE_OUTPUT;
 182
 183         /* sink pad */
 184         ulink.sink.entity = sink->entity->info.id;
 185         ulink.sink.index = sink->index;
 186         ulink.sink.type = MEDIA_PAD_TYPE_INPUT;
 187
 188         ulink.flags = flags | (link->flags & MEDIA_LINK_FLAG_IMMUTABLE);
 189
 190         ret = ioctl(media->fd, MEDIA_IOC_SETUP_LINK, &ulink);
 191         if (ret < 0) {
 192                 printf("%s: Unable to setup link (%s)\n", __func__,
 193                         strerror(errno));
 194                 return ret;
 195         }
 196
 197         link->flags = flags;
 198         return 0;
 199 }
 200
 201 int media_reset_links(struct media_device *media)
 202 {
 203         unsigned int i, j;
 204         int ret;
 205
 206         for (i = 0; i < media->entities_count; ++i) {
 207                 struct media_entity *entity = &media->entities[i];
 208
 209                 for (j = 0; j < entity->info.links; j++) {
 210                         struct media_entity_link *link = &entity->links[j];
 211
 212                         if (link->flags & MEDIA_LINK_FLAG_IMMUTABLE)
 213                                 continue;
 214
 215                         ret = media_setup_link(media, link->source, link->sink,
 216                                                link->flags & ~MEDIA_LINK_FLAG_ACTIVE);
 217                         if (ret < 0)
 218                                 return ret;
 219                 }
 220         }
 221
 222         return 0;
 223 }
 224
 225 static void media_print_topology_dot(struct media_device *media)
 226 {
 227         unsigned int i, j;
 228
 229         printf("digraph board {\n");
 230         printf("\trankdir=TB\n");
 231
 232         for (i = 0; i < media->entities_count; ++i) {
 233                 struct media_entity *entity = &media->entities[i];
 234                 unsigned int npads;
 235
 236                 switch (entity->info.type) {
 237                 case MEDIA_ENTITY_TYPE_NODE:
 238                         printf("\tn%08x [label=\"%s\", shape=box, style=filled, "
 239                                "fillcolor=yellow]\n",
 240                                entity->info.id, entity->info.name);
 241                         break;
 242
 243                 case MEDIA_ENTITY_TYPE_SUBDEV:
 244                         printf("\tn%08x [label=\"{{", entity->info.id);
 245
 246                         for (j = 0, npads = 0; j < entity->info.pads; ++j) {
 247                                 if (entity->pads[j].type != MEDIA_PAD_TYPE_INPUT)
 248                                         continue;
 249
 250                                 printf("%s<port%u> %u", npads ? " | " : "", j, j);
 251                                 npads++;
 252                         }
 253
 254                         printf("} | %s | {", entity->info.name);
 255
 256                         for (j = 0, npads = 0; j < entity->info.pads; ++j) {
 257                                 if (entity->pads[j].type != MEDIA_PAD_TYPE_OUTPUT)
 258                                         continue;
 259
 260                                 printf("%s<port%u> %u", npads ? " | " : "", j, j);
 261                                 npads++;
 262                         }
 263
 264                         printf("}}\", shape=Mrecord, style=filled, fillcolor=green]\n");
 265                         break;
 266
 267                 default:
 268                         continue;
 269                 }
 270
 271                 for (j = 0; j < entity->info.links; j++) {
 272                         struct media_entity_link *link = &entity->links[j];
 273
 274                         if (link->source->entity != entity)
 275                                 continue;
 276
 277                         printf("\tn%08x", link->source->entity->info.id);
 278                         if (link->source->entity->info.type == MEDIA_ENTITY_TYPE_SUBDEV)
 279                                 printf(":port%u", link->source->index);
 280                         printf(" -> ");
 281                         printf("n%08x", link->sink->entity->info.id);
 282                         if (link->sink->entity->info.type == MEDIA_ENTITY_TYPE_SUBDEV)
 283                                 printf(":port%u", link->sink->index);
 284
 285                         if (link->flags & MEDIA_LINK_FLAG_IMMUTABLE)
 286                                 printf(" [style=bold]");
 287                         else if (!(link->flags & MEDIA_LINK_FLAG_ACTIVE))
 288                                 printf(" [style=dashed]");
 289                         printf("\n");
 290                 }
 291         }
 292
 293         printf("}\n");
 294 }
 295
 296 static void media_print_topology_text(struct media_device *media)
 297 {
 298         unsigned int i, j, k;
 299         unsigned int padding;
 300         int ret;
 301
 302         printf("Device topology\n");
 303
 304         for (i = 0; i < media->entities_count; ++i) {
 305                 struct media_entity *entity = &media->entities[i];
 306
 307                 padding = printf("- entity %u: ", entity->info.id);
 308                 printf("%s (%u pad%s, %u link%s)\n", entity->info.name,
 309                         entity->info.pads, entity->info.pads > 1 ? "s" : "",
 310                         entity->info.links, entity->info.links > 1 ? "s" : "");
 311                 printf("%*ctype %s subtype %s\n", padding, ' ',
 312                         media_entity_type_to_string(entity->info.type),
 313                         media_entity_subtype_to_string(entity->info.type, entity->info.subtype));
 314                 if (entity->devname)
 315                         printf("%*cdevice node name %s\n", padding, ' ', entity->devname);
 316
 317                 for (j = 0; j < entity->info.pads; j++) {
 318                         struct media_entity_pad *pad = &entity->pads[j];
 319                         struct v4l2_mbus_framefmt format;
 320
 321                         printf("\tpad%u: %s", j, media_pad_type_to_string(pad->type));
 322
 323                         if (entity->info.type == MEDIA_ENTITY_TYPE_SUBDEV) {
 324                                 ret = v4l2_subdev_get_format(entity, &format, j,
 325                                                      V4L2_SUBDEV_FORMAT_ACTIVE);
 326                                 if (ret == 0)
 327                                         printf(" [%s %ux%u]", pixelcode_to_string(format.code),
 328                                                format.width, format.height);
 329                         }
 330
 331                         printf("\n");
 332
 333                         for (k = 0; k < entity->info.links; k++) {
 334                                 struct media_entity_link *link = &entity->links[k];
 335
 336                                 if (link->source->entity != entity ||
 337                                     link->source->index != j)
 338                                         continue;
 339
 340                                 printf("\t\t-> '%s':pad%u [",
 341                                         link->sink->entity->info.name, link->sink->index);
 342
 343                                 if (link->flags & MEDIA_LINK_FLAG_IMMUTABLE)
 344                                         printf("IMMUTABLE,");
 345                                 if (link->flags & MEDIA_LINK_FLAG_ACTIVE)
 346                                         printf("ACTIVE");
 347
 348                                 printf("]\n");
 349                         }
 350                 }
 351                 printf("\n");
 352         }
 353 }
 354
 355 void media_print_topology(struct media_device *media, int dot)
 356 {
 357         if (dot)
 358                 media_print_topology_dot(media);
 359         else
 360                 media_print_topology_text(media);
 361 }
 362
 363 static int media_enum_links(struct media_device *media)
 364 {
 365         __u32 id;
 366         int ret = 0;
 367
 368         for (id = 1; id <= media->entities_count; id++) {
 369                 struct media_entity *entity = &media->entities[id - 1];
 370                 struct media_user_links links;
 371                 unsigned int i;
 372
 373                 links.entity = entity->info.id;
 374                 links.pads = malloc(entity->info.pads * sizeof(struct media_user_pad));
 375                 links.links = malloc(entity->info.links * sizeof(struct media_user_link));
 376
 377                 if (ioctl(media->fd, MEDIA_IOC_ENUM_LINKS, &links) < 0) {
 378                         printf("%s: Unable to enumerate pads and links (%s).\n",
 379                                 __func__, strerror(errno));
 380                         free(links.pads);
 381                         free(links.links);
 382                         return -errno;
 383                 }
 384
 385                 for (i = 0; i < entity->info.pads; ++i) {
 386                         entity->pads[i].entity = entity;
 387                         entity->pads[i].type = links.pads[i].type;
 388                         entity->pads[i].index = links.pads[i].index;
 389                 }
 390
 391                 for (i = 0; i < entity->info.links; ++i) {
 392                         struct media_user_link *link = &links.links[i];
 393                         struct media_entity *source;
 394                         struct media_entity *sink;
 395
 396                         if (link->source.entity > media->entities_count ||
 397                             link->sink.entity > media->entities_count) {
 398                                 printf("WARNING entity %u link %u from %u/%u to %u/%u is invalid!\n",
 399                                         id, i, link->source.entity, link->source.index,
 400                                         link->sink.entity, link->sink.index);
 401                                 ret = -EINVAL;
 402                         }
 403
 404                         source = &media->entities[link->source.entity - 1];
 405                         sink = &media->entities[link->sink.entity - 1];
 406                         entity->links[i].source = &source->pads[link->source.index];
 407                         entity->links[i].sink = &sink->pads[link->sink.index];
 408                         entity->links[i].flags = links.links[i].flags;
 409                 }
 410
 411                 free(links.pads);
 412                 free(links.links);
 413         }
 414
 415         return ret;
 416 }
 417
 418 static int media_enum_entities(struct media_device *media)
 419 {
 420         struct media_entity *entity;
 421         struct stat devstat;
 422         char devname[32];
 423         unsigned int i;
 424         __u32 id;
 425         int ret;
 426
 427         for (id = 1; ; id++) {
 428                 media->entities =
 429                         realloc(media->entities, id * sizeof(*media->entities));
 430                 entity = &media->entities[id - 1];
 431                 memset(entity, 0, sizeof(*entity));
 432                 entity->fd = -1;
 433                 entity->info.id = id;
 434
 435                 ret = ioctl(media->fd, MEDIA_IOC_ENUM_ENTITIES, &entity->info);
 436                 if (ret < 0) {
 437                         if (errno == EINVAL)
 438                                 break;
 439                         return -errno;
 440                 }
 441
 442                 entity->pads = malloc(entity->info.pads * sizeof(*entity->pads));
 443                 entity->links = malloc(entity->info.links * sizeof(*entity->links));
 444                 if (entity->pads == NULL || entity->links == NULL)
 445                         return -ENOMEM;
 446
 447                 media->entities_count++;
 448
 449                 /* Find the corresponding device name. */
 450                 if ((entity->info.type != MEDIA_ENTITY_TYPE_NODE ||
 451                      entity->info.type != MEDIA_NODE_TYPE_V4L) &&
 452                     (entity->info.type != MEDIA_ENTITY_TYPE_SUBDEV))
 453                         continue;
 454
 455                 for (i = 0; i < 256; ++i) {
 456                         if (entity->info.type == MEDIA_ENTITY_TYPE_NODE)
 457                                 sprintf(devname, "/dev/video%u", i);
 458                         else
 459                                 sprintf(devname, "/dev/subdev%u", i);
 460
 461                         ret = stat(devname, &devstat);
 462                         if (ret < 0)
 463                                 continue;
 464
 465                         if (major(devstat.st_rdev) == entity->info.v4l.major &&
 466                             minor(devstat.st_rdev) == entity->info.v4l.minor) {
 467                                 strcpy(entity->devname, devname);
 468                                 break;
 469                         }
 470                 }
 471         }
 472
 473         return 0;
 474 }
 475
 476 /*
 477  * media_open -
 478  */
 479 struct media_device *media_open(const char *name, int verbose)
 480 {
 481         struct media_device *media;
 482         int ret;
 483
 484         media = malloc(sizeof(*media));
 485         if (media == NULL) {
 486                 printf("%s: unable to allocate memory\n", __func__);
 487                 return NULL;
 488         }
 489         memset(media, 0, sizeof(*media));
 490
 491         if (verbose)
 492                 printf("Opening media device %s\n", name);
 493         media->fd = open(name, O_RDWR);
 494         if (media->fd < 0) {
 495                 media_close(media);
 496                 printf("%s: Can't open media device %s\n", __func__, name);
 497                 return NULL;
 498         }
 499
 500         if (verbose)
 501                 printf("Enumerating entities\n");
 502
 503         ret = media_enum_entities(media);
 504         if (ret < 0) {
 505                 printf("%s: Unable to enumerate entities for device %s (%s)\n",
 506                         __func__, name, strerror(-ret));
 507                 media_close(media);
 508                 return NULL;
 509         }
 510
 511         if (verbose) {
 512                 printf("Found %u entities\n", media->entities_count);
 513                 printf("Enumerating pads and links\n");
 514         }
 515
 516         ret = media_enum_links(media);
 517         if (ret < 0) {
 518                 printf("%s: Unable to enumerate pads and linksfor device %s\n",
 519                         __func__, name);
 520                 media_close(media);
 521                 return NULL;
 522         }
 523
 524         return media;
 525 }
 526
 527 /*
 528  * media_close -
 529  */
 530 void media_close(struct media_device *media)
 531 {
 532         unsigned int i;
 533
 534         if (media->fd != -1)
 535                 close(media->fd);
 536
 537         for (i = 0; i < media->entities_count; ++i) {
 538                 struct media_entity *entity = &media->entities[i];
 539
 540                 free(entity->pads);
 541                 free(entity->links);
 542                 if (entity->fd != -1)
 543                         close(entity->fd);
 544         }
 545
 546         free(media->entities);
 547         free(media);
 548 }
 549