Initial import

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

1 files changed, 433 insertions, 0 deletions

diff --git a/media.c b/media.c
new file mode 100644
index 0000000..81c730c
--- /dev/null
+++ b/media.c
@@ -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);
+}
+