2 * Media controller test application
4 * Copyright (C) 2010 Ideas on board SPRL <laurent.pinchart@ideasonboard.com>
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.
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.
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.,
22 #include <sys/ioctl.h>
24 #include <sys/types.h>
33 #include <linux/videodev2.h>
34 #include <linux/media.h>
39 struct media_pad *media_entity_remote_source(struct media_pad *pad)
43 if (!(pad->flags & MEDIA_PAD_FL_SINK))
46 for (i = 0; i < pad->entity->num_links; ++i) {
47 struct media_link *link = &pad->entity->links[i];
49 if (!(link->flags & MEDIA_LNK_FL_ENABLED))
52 if (link->sink == pad)
59 struct media_entity *media_get_entity_by_name(struct media_device *media,
60 const char *name, size_t length)
64 for (i = 0; i < media->entities_count; ++i) {
65 struct media_entity *entity = &media->entities[i];
67 if (strncmp(entity->info.name, name, length) == 0)
74 struct media_entity *media_get_entity_by_id(struct media_device *media,
79 for (i = 0; i < media->entities_count; ++i) {
80 struct media_entity *entity = &media->entities[i];
82 if (entity->info.id == id)
89 int media_setup_link(struct media_device *media,
90 struct media_pad *source,
91 struct media_pad *sink,
94 struct media_link *link;
95 struct media_link_desc ulink;
99 for (i = 0; i < source->entity->num_links; i++) {
100 link = &source->entity->links[i];
102 if (link->source->entity == source->entity &&
103 link->source->index == source->index &&
104 link->sink->entity == sink->entity &&
105 link->sink->index == sink->index)
109 if (i == source->entity->num_links) {
110 printf("%s: Link not found\n", __func__);
115 ulink.source.entity = source->entity->info.id;
116 ulink.source.index = source->index;
117 ulink.source.flags = MEDIA_PAD_FL_SOURCE;
120 ulink.sink.entity = sink->entity->info.id;
121 ulink.sink.index = sink->index;
122 ulink.sink.flags = MEDIA_PAD_FL_SINK;
124 ulink.flags = flags | (link->flags & MEDIA_LNK_FL_IMMUTABLE);
126 ret = ioctl(media->fd, MEDIA_IOC_SETUP_LINK, &ulink);
128 printf("%s: Unable to setup link (%s)\n", __func__,
133 link->flags = ulink.flags;
134 link->twin->flags = ulink.flags;
138 int media_reset_links(struct media_device *media)
143 for (i = 0; i < media->entities_count; ++i) {
144 struct media_entity *entity = &media->entities[i];
146 for (j = 0; j < entity->num_links; j++) {
147 struct media_link *link = &entity->links[j];
149 if (link->flags & MEDIA_LNK_FL_IMMUTABLE ||
150 link->source->entity != entity)
153 ret = media_setup_link(media, link->source, link->sink,
154 link->flags & ~MEDIA_LNK_FL_ENABLED);
163 static struct media_link *media_entity_add_link(struct media_entity *entity)
165 if (entity->num_links >= entity->max_links) {
166 struct media_link *links = entity->links;
167 unsigned int max_links = entity->max_links * 2;
170 links = realloc(links, max_links * sizeof *links);
174 for (i = 0; i < entity->num_links; ++i)
175 links[i].twin->twin = &links[i];
177 entity->max_links = max_links;
178 entity->links = links;
181 return &entity->links[entity->num_links++];
184 static int media_enum_links(struct media_device *media)
189 for (id = 1; id <= media->entities_count; id++) {
190 struct media_entity *entity = &media->entities[id - 1];
191 struct media_links_enum links;
194 links.entity = entity->info.id;
195 links.pads = malloc(entity->info.pads * sizeof(struct media_pad_desc));
196 links.links = malloc(entity->info.links * sizeof(struct media_link_desc));
198 if (ioctl(media->fd, MEDIA_IOC_ENUM_LINKS, &links) < 0) {
199 printf("%s: Unable to enumerate pads and links (%s).\n",
200 __func__, strerror(errno));
206 for (i = 0; i < entity->info.pads; ++i) {
207 entity->pads[i].entity = entity;
208 entity->pads[i].index = links.pads[i].index;
209 entity->pads[i].flags = links.pads[i].flags;
212 for (i = 0; i < entity->info.links; ++i) {
213 struct media_link_desc *link = &links.links[i];
214 struct media_link *fwdlink;
215 struct media_link *backlink;
216 struct media_entity *source;
217 struct media_entity *sink;
219 source = media_get_entity_by_id(media, link->source.entity);
220 sink = media_get_entity_by_id(media, link->sink.entity);
222 if (source == NULL || sink == NULL) {
223 printf("WARNING entity %u link %u from %u/%u to %u/%u is invalid!\n",
224 id, i, link->source.entity, link->source.index,
225 link->sink.entity, link->sink.index);
228 fwdlink = media_entity_add_link(source);
229 fwdlink->source = &source->pads[link->source.index];
230 fwdlink->sink = &sink->pads[link->sink.index];
231 fwdlink->flags = link->flags;
233 backlink = media_entity_add_link(sink);
234 backlink->source = &source->pads[link->source.index];
235 backlink->sink = &sink->pads[link->sink.index];
236 backlink->flags = link->flags;
238 fwdlink->twin = backlink;
239 backlink->twin = fwdlink;
254 static inline int media_udev_open(struct udev **udev)
262 static inline void media_udev_close(struct udev *udev)
268 static int media_get_devname_udev(struct udev *udev,
269 struct media_entity *entity, int verbose)
271 struct udev_device *device;
279 devnum = makedev(entity->info.v4l.major, entity->info.v4l.minor);
281 printf("looking up device: %u:%u\n", major(devnum), minor(devnum));
282 device = udev_device_new_from_devnum(udev, 'c', devnum);
284 p = udev_device_get_devnode(device);
286 strncpy(entity->devname, p, sizeof(entity->devname));
287 entity->devname[sizeof(entity->devname) - 1] = '\0';
292 udev_device_unref(device);
297 #else /* HAVE_LIBUDEV */
301 static inline int media_udev_open(struct udev **udev) { return 0; }
303 static inline void media_udev_close(struct udev *udev) { }
305 static inline int media_get_devname_udev(struct udev *udev,
306 struct media_entity *entity, int verbose)
311 #endif /* HAVE_LIBUDEV */
313 static int media_get_devname_sysfs(struct media_entity *entity)
322 sprintf(sysname, "/sys/dev/char/%u:%u", entity->info.v4l.major,
323 entity->info.v4l.minor);
324 ret = readlink(sysname, target, sizeof(target));
329 p = strrchr(target, '/');
333 sprintf(devname, "/dev/%s", p + 1);
334 ret = stat(devname, &devstat);
338 /* Sanity check: udev might have reordered the device nodes.
339 * Make sure the major/minor match. We should really use
342 if (major(devstat.st_rdev) == entity->info.v4l.major &&
343 minor(devstat.st_rdev) == entity->info.v4l.minor)
344 strcpy(entity->devname, devname);
349 static int media_enum_entities(struct media_device *media, int verbose)
351 struct media_entity *entity;
357 ret = media_udev_open(&udev);
359 printf("%s: Can't get udev context\n", __func__);
361 for (id = 0, ret = 0; ; id = entity->info.id) {
362 size = (media->entities_count + 1) * sizeof(*media->entities);
363 media->entities = realloc(media->entities, size);
365 entity = &media->entities[media->entities_count];
366 memset(entity, 0, sizeof(*entity));
368 entity->info.id = id | MEDIA_ENT_ID_FLAG_NEXT;
370 ret = ioctl(media->fd, MEDIA_IOC_ENUM_ENTITIES, &entity->info);
372 ret = errno != EINVAL ? -errno : 0;
376 /* Number of links (for outbound links) plus number of pads (for
377 * inbound links) is a good safe initial estimate of the total
380 entity->max_links = entity->info.pads + entity->info.links;
382 entity->pads = malloc(entity->info.pads * sizeof(*entity->pads));
383 entity->links = malloc(entity->max_links * sizeof(*entity->links));
384 if (entity->pads == NULL || entity->links == NULL) {
389 media->entities_count++;
391 /* Find the corresponding device name. */
392 if (media_entity_type(entity) != MEDIA_ENT_T_DEVNODE &&
393 media_entity_type(entity) != MEDIA_ENT_T_V4L2_SUBDEV)
396 /* Try to get the device name via udev */
397 if (!media_get_devname_udev(udev, entity, verbose))
400 /* Fall back to get the device name via sysfs */
401 media_get_devname_sysfs(entity);
404 media_udev_close(udev);
408 struct media_device *media_open(const char *name, int verbose)
410 struct media_device *media;
413 media = malloc(sizeof(*media));
415 printf("%s: unable to allocate memory\n", __func__);
418 memset(media, 0, sizeof(*media));
421 printf("Opening media device %s\n", name);
422 media->fd = open(name, O_RDWR);
425 printf("%s: Can't open media device %s\n", __func__, name);
430 printf("Enumerating entities\n");
432 ret = media_enum_entities(media, verbose);
435 printf("%s: Unable to enumerate entities for device %s (%s)\n",
436 __func__, name, strerror(-ret));
442 printf("Found %u entities\n", media->entities_count);
443 printf("Enumerating pads and links\n");
446 ret = media_enum_links(media);
448 printf("%s: Unable to enumerate pads and linksfor device %s\n",
457 void media_close(struct media_device *media)
464 for (i = 0; i < media->entities_count; ++i) {
465 struct media_entity *entity = &media->entities[i];
469 if (entity->fd != -1)
473 free(media->entities);