diff options
Diffstat (limited to 'media.c')
| -rw-r--r-- | media.c | 433 |
1 files changed, 433 insertions, 0 deletions
@@ -0,0 +1,433 @@ +/* + * Media controller test application + * + * Copyright (C) 2010 Ideas on board SPRL <laurent.pinchart@ideasonboard.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + */ + +#include <sys/ioctl.h> +#include <sys/stat.h> +#include <sys/types.h> + +#include <unistd.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <fcntl.h> +#include <errno.h> + +#include <linux/videodev2.h> +#include <linux/media.h> + +#include "media.h" +#include "tools.h" + +static const char *media_entity_type_to_string(unsigned type) +{ + static const struct { + __u32 type; + const char *name; + } types[] = { + { MEDIA_ENTITY_TYPE_NODE, "Node" }, + { MEDIA_ENTITY_TYPE_SUBDEV, "V4L2 subdev" }, + }; + + unsigned int i; + + for (i = 0; i < ARRAY_SIZE(types); i++) { + if (types[i].type == type) + return types[i].name; + } + + return "Unknown"; +} + +static const char *media_entity_subtype_to_string(unsigned type, unsigned subtype) +{ + static const char *node_types[] = { + "Unknown", + "V4L", + "FB", + "ALSA", + "DVB", + }; + static const char *subdev_types[] = { + "Unknown", + "Video Decoder", + "Video Encoder", + "Miscellaneous", + }; + + switch (type) { + case MEDIA_ENTITY_TYPE_NODE: + if (subtype > 4) + subtype = 0; + return node_types[subtype]; + + case MEDIA_ENTITY_TYPE_SUBDEV: + if (subtype > 3) + subtype = 0; + return subdev_types[subtype]; + default: + return node_types[0]; + } +} + +/* + * media_entity_remote_pad - + */ +struct media_entity_pad *media_entity_remote_pad(struct media_entity_pad *pad) +{ + unsigned int i; + + for (i = 0; i < pad->entity->info.links; ++i) { + struct media_entity_link *link = &pad->entity->links[i]; + + if (!(link->flags & MEDIA_LINK_FLAG_ACTIVE)) + continue; + + if (link->source == pad) + return link->sink; + + if (link->sink == pad) + return link->source; + } + + return NULL; +} + +/* + * media_entity_by_name - + */ +struct media_entity *media_get_entity_by_name(struct media_device *media, + const char *name, size_t length) +{ + unsigned int i; + + for (i = 0; i < media->entities_count; ++i) { + struct media_entity *entity = &media->entities[i]; + + if (strncmp(entity->info.name, name, length) == 0) + return entity; + } + + return NULL; +} + +/* + * media_setup_link - + */ +int media_setup_link(struct media_device *media, + struct media_entity_pad *source, + struct media_entity_pad *sink, + __u32 flags) +{ + struct media_entity_link *link; + struct media_user_link ulink; + unsigned int i; + int ret; + + for (i = 0; i < source->entity->info.links; i++) { + link = &source->entity->links[i]; + + if (link->source->entity == source->entity && + link->source->index == source->index && + link->sink->entity == sink->entity && + link->sink->index == sink->index) + break; + } + + if (i == source->entity->info.links) { + printf("%s: Link not found\n", __func__); + return -EINVAL; + } + + /* source pad */ + ulink.source.entity = source->entity->info.id; + ulink.source.index = source->index; + ulink.source.type = MEDIA_PAD_TYPE_OUTPUT; + + /* sink pad */ + ulink.sink.entity = sink->entity->info.id; + ulink.sink.index = sink->index; + ulink.sink.type = MEDIA_PAD_TYPE_INPUT; + + ulink.flags = flags | (link->flags & MEDIA_LINK_FLAG_IMMUTABLE); + + ret = ioctl(media->fd, MEDIA_IOC_SETUP_LINK, &ulink); + if (ret < 0) { + printf("%s: Unable to setup link (%s)\n", __func__, + strerror(errno)); + return ret; + } + + link->flags = flags; + return 0; +} + +int media_reset_links(struct media_device *media) +{ + unsigned int i, j; + int ret; + + for (i = 0; i < media->entities_count; ++i) { + struct media_entity *entity = &media->entities[i]; + + for (j = 0; j < entity->info.links; j++) { + struct media_entity_link *link = &entity->links[j]; + + if (link->flags & MEDIA_LINK_FLAG_IMMUTABLE) + continue; + + ret = media_setup_link(media, link->source, link->sink, + link->flags & ~MEDIA_LINK_FLAG_ACTIVE); + if (ret < 0) + return ret; + } + } + + return 0; +} + +void media_print_topology(struct media_device *media) +{ + unsigned int i, j, k; + unsigned int padding; + + printf("Device topology\n"); + + for (i = 0; i < media->entities_count; ++i) { + struct media_entity *entity = &media->entities[i]; + + padding = printf("- entity %u: ", entity->info.id); + printf("%s (%u pad%s, %u link%s)\n", entity->info.name, + entity->info.pads, entity->info.pads > 1 ? "s" : "", + entity->info.links, entity->info.links > 1 ? "s" : ""); + printf("%*ctype %s subtype %s\n", padding, ' ', + media_entity_type_to_string(entity->info.type), + media_entity_subtype_to_string(entity->info.type, entity->info.subtype)); + if (entity->devname) + printf("%*cdevice node name %s\n", padding, ' ', entity->devname); + + for (j = 0; j < entity->info.pads; j++) { + for (k = 0; k < entity->info.links; k++) { + struct media_entity_link *link = &entity->links[k]; + + if (link->source->entity != entity || + link->source->index != j) + continue; + + printf("\tpad%u -> '%s':pad%u [", link->source->index, + link->sink->entity->info.name, link->sink->index); + + if (link->flags & MEDIA_LINK_FLAG_IMMUTABLE) + printf("IMMUTABLE,"); + if (link->flags & MEDIA_LINK_FLAG_ACTIVE) + printf("ACTIVE"); + + printf("]\n"); + } + } + printf("\n"); + } +} + +static int media_enum_links(struct media_device *media) +{ + __u32 id; + int ret = 0; + + for (id = 1; id <= media->entities_count; id++) { + struct media_entity *entity = &media->entities[id - 1]; + struct media_user_links links; + unsigned int i; + + links.entity = entity->info.id; + links.pads = malloc(entity->info.pads * sizeof(struct media_user_pad)); + links.links = malloc(entity->info.links * sizeof(struct media_user_link)); + + if (ioctl(media->fd, MEDIA_IOC_ENUM_LINKS, &links) < 0) { + printf("%s: Unable to enumerate pads and links (%s).\n", + __func__, strerror(errno)); + free(links.pads); + free(links.links); + return -errno; + } + + for (i = 0; i < entity->info.pads; ++i) { + entity->pads[i].entity = entity; + entity->pads[i].type = links.pads[i].type; + entity->pads[i].index = links.pads[i].index; + } + + for (i = 0; i < entity->info.links; ++i) { + struct media_user_link *link = &links.links[i]; + struct media_entity *source; + struct media_entity *sink; + + if (link->source.entity > media->entities_count || + link->sink.entity > media->entities_count) { + printf("WARNING entity %u link %u from %u/%u to %u/%u is invalid!\n", + id, i, link->source.entity, link->source.index, + link->sink.entity, link->sink.index); + ret = -EINVAL; + } + + source = &media->entities[link->source.entity - 1]; + sink = &media->entities[link->sink.entity - 1]; + entity->links[i].source = &source->pads[link->source.index]; + entity->links[i].sink = &sink->pads[link->sink.index]; + entity->links[i].flags = links.links[i].flags; + } + + free(links.pads); + free(links.links); + } + + return ret; +} + +static int media_enum_entities(struct media_device *media) +{ + struct media_entity *entity; + struct stat devstat; + char devname[32]; + unsigned int i; + __u32 id; + int ret; + + for (id = 1; ; id++) { + media->entities = + realloc(media->entities, id * sizeof(*media->entities)); + entity = &media->entities[id - 1]; + memset(entity, 0, sizeof(*entity)); + entity->fd = -1; + entity->info.id = id; + + ret = ioctl(media->fd, MEDIA_IOC_ENUM_ENTITIES, &entity->info); + if (ret < 0) { + if (errno == EINVAL) + break; + return -errno; + } + + entity->pads = malloc(entity->info.pads * sizeof(*entity->pads)); + entity->links = malloc(entity->info.links * sizeof(*entity->links)); + if (entity->pads == NULL || entity->links == NULL) + return -ENOMEM; + + media->entities_count++; + + /* Find the corresponding device name. */ + if ((entity->info.type != MEDIA_ENTITY_TYPE_NODE || + entity->info.type != MEDIA_NODE_TYPE_V4L) && + (entity->info.type != MEDIA_ENTITY_TYPE_SUBDEV)) + continue; + + for (i = 0; i < 256; ++i) { + if (entity->info.type == MEDIA_ENTITY_TYPE_NODE) + sprintf(devname, "/dev/video%u", i); + else + sprintf(devname, "/dev/subdev%u", i); + + ret = stat(devname, &devstat); + if (ret < 0) + continue; + + if (major(devstat.st_rdev) == entity->info.v4l.major && + minor(devstat.st_rdev) == entity->info.v4l.minor) { + strcpy(entity->devname, devname); + break; + } + } + } + + return 0; +} + +/* + * media_open - + */ +struct media_device *media_open(const char *name, int verbose) +{ + struct media_device *media; + int ret; + + media = malloc(sizeof(*media)); + if (media == NULL) { + printf("%s: unable to allocate memory\n", __func__); + return NULL; + } + memset(media, 0, sizeof(*media)); + + if (verbose) + printf("Opening media device %s\n", name); + media->fd = open(name, O_RDWR); + if (media->fd < 0) { + media_close(media); + printf("%s: Can't open media device %s\n", __func__, name); + return NULL; + } + + if (verbose) + printf("Enumerating entities\n"); + + ret = media_enum_entities(media); + if (ret < 0) { + printf("%s: Unable to enumerate entities for device %s (%s)\n", + __func__, name, strerror(ret)); + media_close(media); + return NULL; + } + + if (verbose) { + printf("Found %u entities\n", media->entities_count); + printf("Enumerating pads and links\n"); + } + + ret = media_enum_links(media); + if (ret < 0) { + printf("%s: Unable to enumerate pads and linksfor device %s\n", + __func__, name); + media_close(media); + return NULL; + } + + return media; +} + +/* + * media_close - + */ +void media_close(struct media_device *media) +{ + unsigned int i; + + if (media->fd != -1) + close(media->fd); + + for (i = 0; i < media->entities_count; ++i) { + struct media_entity *entity = &media->entities[i]; + + free(entity->pads); + free(entity->links); + if (entity->fd != -1) + close(entity->fd); + } + + free(media->entities); + free(media); +} + |