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_get_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_get_entity_by_id -
 152  */
 153 struct media_entity *media_get_entity_by_id(struct media_device *media,
 154                                             __u32 id)
 155 {
 156         unsigned int i;
 157
 158         for (i = 0; i < media->entities_count; ++i) {
 159                 struct media_entity *entity = &media->entities[i];
 160
 161                 if (entity->info.id == id)
 162                         return entity;
 163         }
 164
 165         return NULL;
 166 }
 167
 168 /*
 169  * media_setup_link -
 170  */
 171 int media_setup_link(struct media_device *media,
 172                      struct media_entity_pad *source,
 173                      struct media_entity_pad *sink,
 174                      __u32 flags)
 175 {
 176         struct media_entity_link *link;
 177         struct media_user_link ulink;
 178         unsigned int i;
 179         int ret;
 180
 181         for (i = 0; i < source->entity->info.links; i++) {
 182                 link = &source->entity->links[i];
 183
 184                 if (link->source->entity == source->entity &&
 185                     link->source->index == source->index &&
 186                     link->sink->entity == sink->entity &&
 187                     link->sink->index == sink->index)
 188                         break;
 189         }
 190
 191         if (i == source->entity->info.links) {
 192                 printf("%s: Link not found\n", __func__);
 193                 return -EINVAL;
 194         }
 195
 196         /* source pad */
 197         ulink.source.entity = source->entity->info.id;
 198         ulink.source.index = source->index;
 199         ulink.source.type = MEDIA_PAD_TYPE_OUTPUT;
 200
 201         /* sink pad */
 202         ulink.sink.entity = sink->entity->info.id;
 203         ulink.sink.index = sink->index;
 204         ulink.sink.type = MEDIA_PAD_TYPE_INPUT;
 205
 206         ulink.flags = flags | (link->flags & MEDIA_LINK_FLAG_IMMUTABLE);
 207
 208         ret = ioctl(media->fd, MEDIA_IOC_SETUP_LINK, &ulink);
 209         if (ret < 0) {
 210                 printf("%s: Unable to setup link (%s)\n", __func__,
 211                         strerror(errno));
 212                 return ret;
 213         }
 214
 215         link->flags = flags;
 216         return 0;
 217 }
 218
 219 int media_reset_links(struct media_device *media)
 220 {
 221         unsigned int i, j;
 222         int ret;
 223
 224         for (i = 0; i < media->entities_count; ++i) {
 225                 struct media_entity *entity = &media->entities[i];
 226
 227                 for (j = 0; j < entity->info.links; j++) {
 228                         struct media_entity_link *link = &entity->links[j];
 229
 230                         if (link->flags & MEDIA_LINK_FLAG_IMMUTABLE)
 231                                 continue;
 232
 233                         ret = media_setup_link(media, link->source, link->sink,
 234                                                link->flags & ~MEDIA_LINK_FLAG_ACTIVE);
 235                         if (ret < 0)
 236                                 return ret;
 237                 }
 238         }
 239
 240         return 0;
 241 }
 242
 243 static void media_print_topology_dot(struct media_device *media)
 244 {
 245         unsigned int i, j;
 246
 247         printf("digraph board {\n");
 248         printf("\trankdir=TB\n");
 249
 250         for (i = 0; i < media->entities_count; ++i) {
 251                 struct media_entity *entity = &media->entities[i];
 252                 unsigned int npads;
 253
 254                 switch (entity->info.type) {
 255                 case MEDIA_ENTITY_TYPE_NODE:
 256                         printf("\tn%08x [label=\"%s\\n%s\", shape=box, style=filled, "
 257                                "fillcolor=yellow]\n",
 258                                entity->info.id, entity->info.name, entity->devname);
 259                         break;
 260
 261                 case MEDIA_ENTITY_TYPE_SUBDEV:
 262                         printf("\tn%08x [label=\"{{", entity->info.id);
 263
 264                         for (j = 0, npads = 0; j < entity->info.pads; ++j) {
 265                                 if (entity->pads[j].type != MEDIA_PAD_TYPE_INPUT)
 266                                         continue;
 267
 268                                 printf("%s<port%u> %u", npads ? " | " : "", j, j);
 269                                 npads++;
 270                         }
 271
 272                         printf("} | %s | {", entity->info.name);
 273
 274                         for (j = 0, npads = 0; j < entity->info.pads; ++j) {
 275                                 if (entity->pads[j].type != MEDIA_PAD_TYPE_OUTPUT)
 276                                         continue;
 277
 278                                 printf("%s<port%u> %u", npads ? " | " : "", j, j);
 279                                 npads++;
 280                         }
 281
 282                         printf("}}\", shape=Mrecord, style=filled, fillcolor=green]\n");
 283                         break;
 284
 285                 default:
 286                         continue;
 287                 }
 288
 289                 for (j = 0; j < entity->info.links; j++) {
 290                         struct media_entity_link *link = &entity->links[j];
 291
 292                         if (link->source->entity != entity)
 293                                 continue;
 294
 295                         printf("\tn%08x", link->source->entity->info.id);
 296                         if (link->source->entity->info.type == MEDIA_ENTITY_TYPE_SUBDEV)
 297                                 printf(":port%u", link->source->index);
 298                         printf(" -> ");
 299                         printf("n%08x", link->sink->entity->info.id);
 300                         if (link->sink->entity->info.type == MEDIA_ENTITY_TYPE_SUBDEV)
 301                                 printf(":port%u", link->sink->index);
 302
 303                         if (link->flags & MEDIA_LINK_FLAG_IMMUTABLE)
 304                                 printf(" [style=bold]");
 305                         else if (!(link->flags & MEDIA_LINK_FLAG_ACTIVE))
 306                                 printf(" [style=dashed]");
 307                         printf("\n");
 308                 }
 309         }
 310
 311         printf("}\n");
 312 }
 313
 314 static void media_print_topology_text(struct media_device *media)
 315 {
 316         unsigned int i, j, k;
 317         unsigned int padding;
 318
 319         printf("Device topology\n");
 320
 321         for (i = 0; i < media->entities_count; ++i) {
 322                 struct media_entity *entity = &media->entities[i];
 323
 324                 padding = printf("- entity %u: ", entity->info.id);
 325                 printf("%s (%u pad%s, %u link%s)\n", entity->info.name,
 326                         entity->info.pads, entity->info.pads > 1 ? "s" : "",
 327                         entity->info.links, entity->info.links > 1 ? "s" : "");
 328                 printf("%*ctype %s subtype %s\n", padding, ' ',
 329                         media_entity_type_to_string(entity->info.type),
 330                         media_entity_subtype_to_string(entity->info.type, entity->info.subtype));
 331                 if (entity->devname[0])
 332                         printf("%*cdevice node name %s\n", padding, ' ', entity->devname);
 333
 334                 for (j = 0; j < entity->info.pads; j++) {
 335                         struct media_entity_pad *pad = &entity->pads[j];
 336
 337                         printf("\tpad%u: %s ", j, media_pad_type_to_string(pad->type));
 338
 339                         if (entity->info.type == MEDIA_ENTITY_TYPE_SUBDEV)
 340                                 v4l2_subdev_print_format(entity, j, V4L2_SUBDEV_FORMAT_ACTIVE);
 341
 342                         printf("\n");
 343
 344                         for (k = 0; k < entity->info.links; k++) {
 345                                 struct media_entity_link *link = &entity->links[k];
 346
 347                                 if (link->source->entity != entity ||
 348                                     link->source->index != j)
 349                                         continue;
 350
 351                                 printf("\t\t-> '%s':pad%u [",
 352                                         link->sink->entity->info.name, link->sink->index);
 353
 354                                 if (link->flags & MEDIA_LINK_FLAG_IMMUTABLE)
 355                                         printf("IMMUTABLE,");
 356                                 if (link->flags & MEDIA_LINK_FLAG_ACTIVE)
 357                                         printf("ACTIVE");
 358
 359                                 printf("]\n");
 360                         }
 361                 }
 362                 printf("\n");
 363         }
 364 }
 365
 366 void media_print_topology(struct media_device *media, int dot)
 367 {
 368         if (dot)
 369                 media_print_topology_dot(media);
 370         else
 371                 media_print_topology_text(media);
 372 }
 373
 374 static int media_enum_links(struct media_device *media)
 375 {
 376         __u32 id;
 377         int ret = 0;
 378
 379         for (id = 1; id <= media->entities_count; id++) {
 380                 struct media_entity *entity = &media->entities[id - 1];
 381                 struct media_user_links links;
 382                 unsigned int i;
 383
 384                 links.entity = entity->info.id;
 385                 links.pads = malloc(entity->info.pads * sizeof(struct media_user_pad));
 386                 links.links = malloc(entity->info.links * sizeof(struct media_user_link));
 387
 388                 if (ioctl(media->fd, MEDIA_IOC_ENUM_LINKS, &links) < 0) {
 389                         printf("%s: Unable to enumerate pads and links (%s).\n",
 390                                 __func__, strerror(errno));
 391                         free(links.pads);
 392                         free(links.links);
 393                         return -errno;
 394                 }
 395
 396                 for (i = 0; i < entity->info.pads; ++i) {
 397                         entity->pads[i].entity = entity;
 398                         entity->pads[i].type = links.pads[i].type;
 399                         entity->pads[i].index = links.pads[i].index;
 400                 }
 401
 402                 for (i = 0; i < entity->info.links; ++i) {
 403                         struct media_user_link *link = &links.links[i];
 404                         struct media_entity *source;
 405                         struct media_entity *sink;
 406
 407                         source = media_get_entity_by_id(media, link->source.entity);
 408                         sink = media_get_entity_by_id(media, link->sink.entity);
 409
 410                         if (source == NULL || sink == NULL) {
 411                                 printf("WARNING entity %u link %u from %u/%u to %u/%u is invalid!\n",
 412                                         id, i, link->source.entity, link->source.index,
 413                                         link->sink.entity, link->sink.index);
 414                                 ret = -EINVAL;
 415                         }
 416
 417                         entity->links[i].source = &source->pads[link->source.index];
 418                         entity->links[i].sink = &sink->pads[link->sink.index];
 419                         entity->links[i].flags = links.links[i].flags;
 420                 }
 421
 422                 free(links.pads);
 423                 free(links.links);
 424         }
 425
 426         return ret;
 427 }
 428
 429 static int media_enum_entities(struct media_device *media)
 430 {
 431         struct media_entity *entity;
 432         struct stat devstat;
 433         char devname[32];
 434         unsigned int size;
 435         unsigned int i;
 436         __u32 id;
 437         int ret;
 438
 439         for (id = 0; ; id = entity->info.id) {
 440                 size = (media->entities_count + 1) * sizeof(*media->entities);
 441                 media->entities = realloc(media->entities, size);
 442
 443                 entity = &media->entities[media->entities_count];
 444                 memset(entity, 0, sizeof(*entity));
 445                 entity->fd = -1;
 446                 entity->info.id = id | MEDIA_ENTITY_ID_FLAG_NEXT;
 447
 448                 ret = ioctl(media->fd, MEDIA_IOC_ENUM_ENTITIES, &entity->info);
 449                 if (ret < 0) {
 450                         if (errno == EINVAL)
 451                                 break;
 452                         return -errno;
 453                 }
 454
 455                 entity->pads = malloc(entity->info.pads * sizeof(*entity->pads));
 456                 entity->links = malloc(entity->info.links * sizeof(*entity->links));
 457                 if (entity->pads == NULL || entity->links == NULL)
 458                         return -ENOMEM;
 459
 460                 media->entities_count++;
 461
 462                 /* Find the corresponding device name. */
 463                 if ((entity->info.type != MEDIA_ENTITY_TYPE_NODE ||
 464                      entity->info.type != MEDIA_NODE_TYPE_V4L) &&
 465                     (entity->info.type != MEDIA_ENTITY_TYPE_SUBDEV))
 466                         continue;
 467
 468                 for (i = 0; i < 256; ++i) {
 469                         if (entity->info.type == MEDIA_ENTITY_TYPE_NODE)
 470                                 sprintf(devname, "/dev/video%u", i);
 471                         else
 472                                 sprintf(devname, "/dev/subdev%u", i);
 473
 474                         ret = stat(devname, &devstat);
 475                         if (ret < 0)
 476                                 continue;
 477
 478                         if (major(devstat.st_rdev) == entity->info.v4l.major &&
 479                             minor(devstat.st_rdev) == entity->info.v4l.minor) {
 480                                 strcpy(entity->devname, devname);
 481                                 break;
 482                         }
 483                 }
 484
 485                 id = entity->info.id;
 486         }
 487
 488         return 0;
 489 }
 490
 491 /*
 492  * media_open -
 493  */
 494 struct media_device *media_open(const char *name, int verbose)
 495 {
 496         struct media_device *media;
 497         int ret;
 498
 499         media = malloc(sizeof(*media));
 500         if (media == NULL) {
 501                 printf("%s: unable to allocate memory\n", __func__);
 502                 return NULL;
 503         }
 504         memset(media, 0, sizeof(*media));
 505
 506         if (verbose)
 507                 printf("Opening media device %s\n", name);
 508         media->fd = open(name, O_RDWR);
 509         if (media->fd < 0) {
 510                 media_close(media);
 511                 printf("%s: Can't open media device %s\n", __func__, name);
 512                 return NULL;
 513         }
 514
 515         if (verbose)
 516                 printf("Enumerating entities\n");
 517
 518         ret = media_enum_entities(media);
 519         if (ret < 0) {
 520                 printf("%s: Unable to enumerate entities for device %s (%s)\n",
 521                         __func__, name, strerror(-ret));
 522                 media_close(media);
 523                 return NULL;
 524         }
 525
 526         if (verbose) {
 527                 printf("Found %u entities\n", media->entities_count);
 528                 printf("Enumerating pads and links\n");
 529         }
 530
 531         ret = media_enum_links(media);
 532         if (ret < 0) {
 533                 printf("%s: Unable to enumerate pads and linksfor device %s\n",
 534                         __func__, name);
 535                 media_close(media);
 536                 return NULL;
 537         }
 538
 539         return media;
 540 }
 541
 542 /*
 543  * media_close -
 544  */
 545 void media_close(struct media_device *media)
 546 {
 547         unsigned int i;
 548
 549         if (media->fd != -1)
 550                 close(media->fd);
 551
 552         for (i = 0; i < media->entities_count; ++i) {
 553                 struct media_entity *entity = &media->entities[i];
 554
 555                 free(entity->pads);
 556                 free(entity->links);
 557                 if (entity->fd != -1)
 558                         close(entity->fd);
 559         }
 560
 561         free(media->entities);
 562         free(media);
 563 }
 564