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/*
* Xilinx Video Library - Plugin API
*
* Copyright (C) 2014-2016 Ideas on board Oy
*
* Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or (at
* your option) any later version.
*
* This library 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.
*/
#include <dirent.h>
#include <dlfcn.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <mediactl.h>
#include <xlnx-plugin.h>
#include <xlnx-video.h>
#include "xlnx-priv.h"
#define __stringify(n) #n
#define _stringify(n) __stringify(n)
#define XLNX_VIDEO_PLUGIN_DIR "/usr/lib/xilinx/video/plugins"
#define XLNX_VIDEO_PLUGIN_SYMBOL_NAME _stringify(XLNX_VIDEO_PLUGIN_SYMBOL)
struct xlnx_video_plugin {
struct list_entry list;
void *handle;
const struct xlnx_video_plugin_ops *ops;
const struct xlnx_video_plugin_info *info;
};
struct xlnx_video_component *xlnx_video_plugin_scan(struct xlnx_video *xv,
struct media_device *mdev)
{
const struct media_device_info *mdev_info = media_get_info(mdev);
struct xlnx_video_component *xvcomp;
struct xlnx_video_plugin *plugin;
xlnx_dbg(xv, "Searching plugin for media device %s (%s)\n",
mdev_info->model, mdev_info->bus_info);
list_for_each_entry(plugin, &xv->plugins, list) {
xlnx_dbg(xv, "Trying plugin `%s'\n", plugin->info->name);
xvcomp = plugin->ops->scan(xv, mdev);
if (xvcomp) {
xlnx_dbg(xv, "Plugin supports media device\n");
return xvcomp;
}
}
xlnx_dbg(xv, "No matching plugin found\n");
return NULL;
}
static int xlnx_video_plugin_load_file(struct xlnx_video *xv, const char *filename)
{
const struct xlnx_video_plugin_ops *plugin_ops;
struct xlnx_video_plugin *plugin;
void *plugin_so;
int ret;
xlnx_dbg(xv, "Loading plugin from file %s\n", filename);
plugin_so = dlopen(filename, RTLD_LAZY);
if (!plugin_so) {
xlnx_dbg(xv, "Failed to open shared library (%s)\n", dlerror());
return -EINVAL;
}
plugin_ops = dlsym(plugin_so, XLNX_VIDEO_PLUGIN_SYMBOL_NAME);
if (!plugin_ops) {
xlnx_dbg(xv, "Plugin symbol not found (%s)\n", dlerror());
ret = -EINVAL;
goto error;
}
plugin = calloc(1, sizeof(*plugin));
if (!plugin) {
ret = -ENOMEM;
goto error;
}
plugin->handle = plugin_so;
plugin->ops = plugin_ops;
plugin->info = plugin_ops->info();
list_append(&plugin->list, &xv->plugins);
xlnx_dbg(xv, "Plugin loaded successfully\n");
return 0;
error:
dlclose(plugin_so);
return ret;
}
/**
* \brief Load plugins from a given directory
* \param xv the library context
* \param path the full path name to the directory containing plugins
*
* This function attempts to load all plugins from the \a path directory. A
* plugin is a shared object whose name ends with '.so' and contains a symbol
* named '__xlnx_video_plugin' pointing to a struct xlnx_video_plugin_ops
* instance.
*
* When a valid plugin is found and loaded, call the init function supplied in
* the plugin operations structure.
*
* Shared objects that fail to load, don't export the plugin operations
* structure, don't implement the init function or return an error from their
* init function are ignored and not considered as a fatal error.
*
* \return Return the number of plugins successfully loaded, or a negative error
* code if a fatal error occurs.
*/
int xlnx_video_plugin_load_directory(struct xlnx_video *xv, const char *path)
{
struct dirent *entry;
unsigned int count = 0;
size_t pathlen;
DIR *dir;
int ret = 0;
xlnx_dbg(xv, "Loading plugins from directory %s\n", path);
dir = opendir(path);
if (!dir) {
xlnx_dbg(xv, "Failed to open directory\n");
return -errno;
}
pathlen = strlen(path);
while ((entry = readdir(dir))) {
char *filename;
size_t len;
if (entry->d_type != DT_REG && entry->d_type != DT_LNK &&
entry->d_type != DT_UNKNOWN)
continue;
len = strlen(entry->d_name);
if (strcmp(entry->d_name + len - 3, ".so"))
continue;
filename = malloc(pathlen + 1 + len + 1);
if (!filename)
break;
strcpy(filename, path);
filename[pathlen] = '/';
strcpy(filename + pathlen + 1, entry->d_name);
ret = xlnx_video_plugin_load_file(xv, filename);
free(filename);
if (ret < 0)
continue;
count++;
}
closedir(dir);
return ret < 0 ? ret : (int)count;
}
/** \cond INTERNAL_API */
/**
* \brief Initialize plugin support
* \param xv the library context
*
* Initialize plugin support and load plugins from the system default plugin
* directory ('/usr/lib/xilinx/video/plugins' by default).
*
* \return 0 on success or a negative error code if an error occurs.
*/
int xlnx_video_plugin_init(struct xlnx_video *xv)
{
xlnx_video_plugin_load_directory(xv, XLNX_VIDEO_PLUGIN_DIR);
return 0;
}
/**
* \brief Initialize plugin support
* \param xv the library context
*
* Initialize plugin support and load plugins from the system default plugin
* directory ('/usr/lib/xilinx/video/plugins' by default).
*
* \return 0 on success or a negative error code if an error occurs.
*/
void xlnx_video_plugin_fini(struct xlnx_video *xv)
{
struct xlnx_video_plugin *plugin, *next;
list_for_each_entry_safe(plugin, next, &xv->plugins, list) {
list_remove(&plugin->list);
dlclose(plugin->handle);
free(plugin);
}
}
/** \endcond */
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