/* GStreamer * Copyright (C) 2006 Stefan Kost * * gstpreset.c: helper interface for element presets * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 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 * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ /** * SECTION:gstpreset * @short_description: helper interface for element presets * * This interface offers methods to query and manipulate parameter preset sets. * A preset is a bunch of property settings, together with meta data and a name. * The name of a preset serves as key for subsequent method calls to manipulate * single presets. * All instances of one type will share the list of presets. The list is created * on demand, if presets are not used, the list is not created. * * The interface comes with a default implementation that serves most plugins. * Wrapper plugins will override most methods to implement support for the * native preset format of those wrapped plugins. * One method that is useful to be overridden is gst_preset_get_property_names(). * With that one can control which properties are saved and in which order. * * The default implementation supports presets located in a system directory, * application specific directory and in the users home directory. When getting * a list of presets individual presets are read and overlaid in 1) system, * 2) application and 3) user order. Whenever an earlier entry is newer, the * later entries will be updated. * */ /* FIXME: * - non racyness * - we need to avoid two instances writing the preset file * -> flock(fileno()), http://www.ecst.csuchico.edu/~beej/guide/ipc/flock.html * -> open exclusive * -> better save the new file to a tempfile and then rename? * - we like to know when any other instance makes changes to the keyfile * - then ui can be updated * - and we make sure that we don't lose edits * -> its the same problem actually, once for inside a process, once system- * wide * - can we use a lock inside a names shared memory segment? * * - should there be a 'preset-list' property to get the preset list * (and to connect a notify:: to to listen for changes) * we could use gnome_vfs_monitor_add() to monitor the user preset_file. * * - should there be a 'preset-name' property so that we can set a preset via * gst-launch, or should we handle this with special syntax in gst-launch: * gst-launch element preset: property=value ... * - this would allow to have preset-bundles too (a preset on bins that * specifies presets for children */ #include "gst_private.h" #include "gstpreset.h" #include "gstchildproxy.h" #include "gstinfo.h" #include "gstvalue.h" #ifdef HAVE_UNISTD_H #include #endif #include #define GST_CAT_DEFAULT preset_debug GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT); /* defines for keyfile usage, this group contains the element type name and * version these presets belong to. */ #define PRESET_HEADER "_presets_" /* keys of the preset header section */ #define PRESET_HEADER_ELEMENT_NAME "element-name" #define PRESET_HEADER_VERSION "version" static GQuark preset_user_path_quark = 0; static GQuark preset_app_path_quark = 0; static GQuark preset_system_path_quark = 0; static GQuark preset_quark = 0; /*static GQuark property_list_quark = 0;*/ /* the application can set a custom path that is checked in addition to standard * system and user dirs. This helps to develop new presets first local to the * application. */ static gchar *preset_app_dir = NULL; /* default iface implementation */ static gboolean gst_preset_default_save_presets_file (GstPreset * preset); /* * preset_get_paths: * @preset: a #GObject that implements #GstPreset * @preset_user_path: location for path or %NULL * @preset_app_path: location for path or %NULL * @preset_system_path: location for path or %NULL * * Fetch the preset_path for user local, application specific and system wide * settings. Don't free after use. * * Returns: %FALSE if no paths could be found. */ static gboolean preset_get_paths (GstPreset * preset, const gchar ** preset_user_path, const gchar ** preset_app_path, const gchar ** preset_system_path) { GType type = G_TYPE_FROM_INSTANCE (preset); gchar *preset_path; const gchar *element_name; /* we use the element name when we must construct the paths */ element_name = G_OBJECT_TYPE_NAME (preset); GST_INFO_OBJECT (preset, "element_name: '%s'", element_name); if (preset_user_path) { /* preset user path requested, see if we have it cached in the qdata */ if (!(preset_path = g_type_get_qdata (type, preset_user_path_quark))) { gchar *preset_dir; /* user presets go in user's XDG data directory. */ preset_dir = g_build_filename (g_get_user_data_dir (), "gstreamer-" GST_API_VERSION, "presets", NULL); GST_INFO_OBJECT (preset, "user_preset_dir: '%s'", preset_dir); preset_path = g_strdup_printf ("%s" G_DIR_SEPARATOR_S "%s.prs", preset_dir, element_name); GST_INFO_OBJECT (preset, "user_preset_path: '%s'", preset_path); /* create dirs */ g_mkdir_with_parents (preset_dir, 0755); g_free (preset_dir); /* cache the preset path to the type */ g_type_set_qdata (type, preset_user_path_quark, preset_path); } *preset_user_path = preset_path; } if (preset_app_path) { if (preset_app_dir) { if (!(preset_path = g_type_get_qdata (type, preset_system_path_quark))) { preset_path = g_strdup_printf ("%s" G_DIR_SEPARATOR_S "%s.prs", preset_app_dir, element_name); GST_INFO_OBJECT (preset, "application_preset_path: '%s'", preset_path); /* cache the preset path to the type */ g_type_set_qdata (type, preset_app_path_quark, preset_path); } *preset_app_path = preset_path; } else { *preset_app_path = NULL; } } if (preset_system_path) { /* preset system path requested, see if we have it cached in the qdata */ if (!(preset_path = g_type_get_qdata (type, preset_system_path_quark))) { gchar *preset_dir; /* system presets in '$GST_DATADIR/gstreamer-1.0/presets/GstAudioPanorama.prs' */ preset_dir = g_build_filename (GST_DATADIR, "gstreamer-" GST_API_VERSION, "presets", NULL); GST_INFO_OBJECT (preset, "system_preset_dir: '%s'", preset_dir); preset_path = g_strdup_printf ("%s" G_DIR_SEPARATOR_S "%s.prs", preset_dir, element_name); GST_INFO_OBJECT (preset, "system_preset_path: '%s'", preset_path); /* create dirs */ g_mkdir_with_parents (preset_dir, 0755); g_free (preset_dir); /* cache the preset path to the type */ g_type_set_qdata (type, preset_system_path_quark, preset_path); } *preset_system_path = preset_path; } return TRUE; } static gboolean preset_skip_property (GParamSpec * property) { if (((property->flags & G_PARAM_READWRITE) != G_PARAM_READWRITE) || (property->flags & G_PARAM_CONSTRUCT_ONLY)) return TRUE; /* FIXME: skip GST_PARAM_NOT_PRESETABLE, see #522205 */ return FALSE; } static guint64 preset_parse_version (const gchar * str_version) { guint major, minor, micro, nano; gint num; major = minor = micro = nano = 0; /* parse version (e.g. 0.10.15.1) to guint64 */ num = sscanf (str_version, "%u.%u.%u.%u", &major, &minor, µ, &nano); /* make sure we have at least "major.minor" */ if (num > 1) { guint64 version; version = ((((major << 8 | minor) << 8) | micro) << 8) | nano; GST_DEBUG ("version %s -> %" G_GUINT64_FORMAT, str_version, version); return version; } return G_GUINT64_CONSTANT (0); } static GKeyFile * preset_open_and_parse_header (GstPreset * preset, const gchar * preset_path, guint64 * preset_version) { GKeyFile *in; GError *error = NULL; gboolean res; const gchar *element_name; gchar *name; in = g_key_file_new (); res = g_key_file_load_from_file (in, preset_path, G_KEY_FILE_KEEP_COMMENTS | G_KEY_FILE_KEEP_TRANSLATIONS, &error); if (!res || error != NULL) goto load_error; /* element type name and preset name must match or we are dealing with a wrong * preset file */ element_name = G_OBJECT_TYPE_NAME (preset); name = g_key_file_get_value (in, PRESET_HEADER, PRESET_HEADER_ELEMENT_NAME, NULL); if (!name || strcmp (name, element_name)) goto wrong_name; g_free (name); /* get the version now so that the caller can check it */ if (preset_version) { gchar *str = g_key_file_get_value (in, PRESET_HEADER, PRESET_HEADER_VERSION, NULL); *preset_version = preset_parse_version (str); g_free (str); } return in; /* ERRORS */ load_error: { GST_WARNING_OBJECT (preset, "Unable to read preset file %s: %s", preset_path, error->message); g_error_free (error); g_key_file_free (in); return NULL; } wrong_name: { GST_WARNING_OBJECT (preset, "Wrong element name in preset file %s. Expected %s, got %s", preset_path, element_name, GST_STR_NULL (name)); g_free (name); g_key_file_free (in); return NULL; } } static void preset_merge (GKeyFile * system, GKeyFile * user) { gchar *str; gchar **groups, **keys; gsize i, j, num_groups, num_keys; /* copy file comment if there is any */ if ((str = g_key_file_get_comment (user, NULL, NULL, NULL))) { g_key_file_set_comment (system, NULL, NULL, str, NULL); g_free (str); } /* get groups in user and copy into system */ groups = g_key_file_get_groups (user, &num_groups); for (i = 0; i < num_groups; i++) { /* copy group comment if there is any */ if ((str = g_key_file_get_comment (user, groups[i], NULL, NULL))) { g_key_file_set_comment (system, groups[i], NULL, str, NULL); g_free (str); } /* ignore private groups */ if (groups[i][0] == '_') continue; /* if group already exists in system, remove and re-add keys from user */ if (g_key_file_has_group (system, groups[i])) { g_key_file_remove_group (system, groups[i], NULL); } keys = g_key_file_get_keys (user, groups[i], &num_keys, NULL); for (j = 0; j < num_keys; j++) { /* copy key comment if there is any */ if ((str = g_key_file_get_comment (user, groups[i], keys[j], NULL))) { g_key_file_set_comment (system, groups[i], keys[j], str, NULL); g_free (str); } str = g_key_file_get_value (user, groups[i], keys[j], NULL); g_key_file_set_value (system, groups[i], keys[j], str); g_free (str); } g_strfreev (keys); } g_strfreev (groups); } /* reads the user and system presets files and merges them together. This * function caches the GKeyFile on the element type. If there is no existing * preset file, a new in-memory GKeyFile will be created. */ static GKeyFile * preset_get_keyfile (GstPreset * preset) { GKeyFile *presets; GType type = G_TYPE_FROM_INSTANCE (preset); /* first see if the have a cached version for the type */ if (!(presets = g_type_get_qdata (type, preset_quark))) { const gchar *preset_user_path, *preset_app_path, *preset_system_path; guint64 version_system = G_GUINT64_CONSTANT (0); guint64 version_app = G_GUINT64_CONSTANT (0); guint64 version_user = G_GUINT64_CONSTANT (0); guint64 version = G_GUINT64_CONSTANT (0); gboolean merged = FALSE; GKeyFile *in_user, *in_app = NULL, *in_system; preset_get_paths (preset, &preset_user_path, &preset_app_path, &preset_system_path); /* try to load the user, app and system presets, we do this to get the * versions of all files. */ in_user = preset_open_and_parse_header (preset, preset_user_path, &version_user); if (preset_app_path) { in_app = preset_open_and_parse_header (preset, preset_app_path, &version_app); } in_system = preset_open_and_parse_header (preset, preset_system_path, &version_system); /* compare version to check for merge */ if (in_system) { presets = in_system; version = version_system; } if (in_app) { /* if system version is higher, merge */ if (version > version_app) { preset_merge (presets, in_app); g_key_file_free (in_app); } else { if (presets) g_key_file_free (presets); presets = in_app; version = version_system; } } if (in_user) { /* if system or app version is higher, merge */ if (version > version_user) { preset_merge (presets, in_user); g_key_file_free (in_user); merged = TRUE; } else { if (presets) g_key_file_free (presets); presets = in_user; } } if (!presets) { /* we did not load a user, app or system presets file, create a new one */ presets = g_key_file_new (); g_key_file_set_string (presets, PRESET_HEADER, PRESET_HEADER_ELEMENT_NAME, G_OBJECT_TYPE_NAME (preset)); } /* attach the preset to the type */ g_type_set_qdata (type, preset_quark, (gpointer) presets); if (merged) { gst_preset_default_save_presets_file (preset); } } return presets; } /* get a list of all supported preset names for an element */ static gchar ** gst_preset_default_get_preset_names (GstPreset * preset) { GKeyFile *presets; gsize i, num_groups; gchar **groups; /* get the presets from the type */ if (!(presets = preset_get_keyfile (preset))) goto no_presets; /* get the groups, which are also the preset names */ if (!(groups = g_key_file_get_groups (presets, &num_groups))) goto no_groups; /* remove all private group names starting with '_' from the array */ for (i = 0; i < num_groups; i++) { if (groups[i][0] == '_') { /* free private group */ g_free (groups[i]); /* move last element of list down */ num_groups--; /* move last element into removed element */ groups[i] = groups[num_groups]; groups[num_groups] = NULL; } } /* sort the array now */ g_qsort_with_data (groups, num_groups, sizeof (gchar *), (GCompareDataFunc) strcmp, NULL); return groups; /* ERRORS */ no_presets: { GST_WARNING_OBJECT (preset, "Could not load presets"); return NULL; } no_groups: { GST_WARNING_OBJECT (preset, "Could not find preset groups"); return NULL; } } /* get a list of all property names that are used for presets */ static gchar ** gst_preset_default_get_property_names (GstPreset * preset) { GParamSpec **props; guint i, j = 0, n_props; GObjectClass *gclass; gboolean is_child_proxy; gchar **result = NULL; gclass = G_OBJECT_CLASS (GST_ELEMENT_GET_CLASS (preset)); is_child_proxy = GST_IS_CHILD_PROXY (preset); /* get a list of object properties */ props = g_object_class_list_properties (gclass, &n_props); if (props) { /* allocate array big enough to hold the worst case, including a terminating * NULL pointer. */ result = g_new (gchar *, n_props + 1); /* now filter out the properties that we can use for presets */ GST_DEBUG_OBJECT (preset, " filtering properties: %u", n_props); for (i = 0; i < n_props; i++) { if (preset_skip_property (props[i])) continue; GST_DEBUG_OBJECT (preset, " using: %s", props[i]->name); result[j++] = g_strdup (props[i]->name); } g_free (props); } if (is_child_proxy) { guint c, n_children; GObject *child; n_children = gst_child_proxy_get_children_count ((GstChildProxy *) preset); for (c = 0; c < n_children; c++) { child = gst_child_proxy_get_child_by_index ((GstChildProxy *) preset, c); gclass = G_OBJECT_CLASS (GST_ELEMENT_GET_CLASS (child)); props = g_object_class_list_properties (gclass, &n_props); if (props) { /* resize property name array */ result = g_renew (gchar *, result, j + n_props + 1); /* now filter out the properties that we can use for presets */ GST_DEBUG_OBJECT (preset, " filtering properties: %u", n_props); for (i = 0; i < n_props; i++) { if (preset_skip_property (props[i])) continue; GST_DEBUG_OBJECT (preset, " using: %s::%s", GST_OBJECT_NAME (child), props[i]->name); result[j++] = g_strdup_printf ("%s::%s", GST_OBJECT_NAME (child), props[i]->name); } g_free (props); } } } if (!result) { GST_INFO_OBJECT (preset, "object has no properties"); } else { result[j] = NULL; } return result; } /* load the presets of @name for the instance @preset. Returns %FALSE if something * failed. */ static gboolean gst_preset_default_load_preset (GstPreset * preset, const gchar * name) { GKeyFile *presets; gchar **props; guint i; GObjectClass *gclass; gboolean is_child_proxy; /* get the presets from the type */ if (!(presets = preset_get_keyfile (preset))) goto no_presets; /* get the preset name */ if (!g_key_file_has_group (presets, name)) goto no_group; GST_DEBUG_OBJECT (preset, "loading preset : '%s'", name); /* get the properties that we can configure in this element */ if (!(props = gst_preset_get_property_names (preset))) goto no_properties; gclass = G_OBJECT_CLASS (GST_ELEMENT_GET_CLASS (preset)); is_child_proxy = GST_IS_CHILD_PROXY (preset); /* for each of the property names, find the preset parameter and try to * configure the property with its value */ for (i = 0; props[i]; i++) { gchar *str; GValue gvalue = { 0, }; GParamSpec *property = NULL; /* check if we have a settings for this element property */ if (!(str = g_key_file_get_value (presets, name, props[i], NULL))) { /* the element has a property but the parameter is not in the keyfile */ GST_WARNING_OBJECT (preset, "parameter '%s' not in preset", props[i]); continue; } GST_DEBUG_OBJECT (preset, "setting value '%s' for property '%s'", str, props[i]); if (is_child_proxy) { gst_child_proxy_lookup ((GstChildProxy *) preset, props[i], NULL, &property); } else { property = g_object_class_find_property (gclass, props[i]); } if (!property) { /* the parameter was in the keyfile, the element said it supported it but * then the property was not found in the element. This should not happen. */ GST_WARNING_OBJECT (preset, "property '%s' not in object", props[i]); g_free (str); continue; } /* try to deserialize the property value from the keyfile and set it as * the object property */ g_value_init (&gvalue, property->value_type); if (gst_value_deserialize (&gvalue, str)) { if (is_child_proxy) { gst_child_proxy_set_property ((GstChildProxy *) preset, props[i], &gvalue); } else { g_object_set_property ((GObject *) preset, props[i], &gvalue); } } else { GST_WARNING_OBJECT (preset, "deserialization of value '%s' for property '%s' failed", str, props[i]); } g_value_unset (&gvalue); g_free (str); } g_strfreev (props); return TRUE; /* ERRORS */ no_presets: { GST_WARNING_OBJECT (preset, "no presets"); return FALSE; } no_group: { GST_WARNING_OBJECT (preset, "no preset named '%s'", name); return FALSE; } no_properties: { GST_INFO_OBJECT (preset, "no properties"); return FALSE; } } /* save the presets file. A copy of the existing presets file is stored in a * .bak file */ static gboolean gst_preset_default_save_presets_file (GstPreset * preset) { GKeyFile *presets; const gchar *preset_path; GError *error = NULL; gchar *bak_file_name; gboolean backup = TRUE; gchar *data; gsize data_size; preset_get_paths (preset, &preset_path, NULL, NULL); /* get the presets from the type */ if (!(presets = preset_get_keyfile (preset))) goto no_presets; GST_DEBUG_OBJECT (preset, "saving preset file: '%s'", preset_path); /* create backup if possible */ bak_file_name = g_strdup_printf ("%s.bak", preset_path); if (g_file_test (bak_file_name, G_FILE_TEST_EXISTS)) { if (g_unlink (bak_file_name)) { backup = FALSE; GST_INFO_OBJECT (preset, "cannot remove old backup file : %s", bak_file_name); } } if (backup) { if (g_rename (preset_path, bak_file_name)) { GST_INFO_OBJECT (preset, "cannot backup file : %s -> %s", preset_path, bak_file_name); } } g_free (bak_file_name); /* update gstreamer version */ g_key_file_set_string (presets, PRESET_HEADER, PRESET_HEADER_VERSION, PACKAGE_VERSION); /* get new contents, wee need this to save it */ if (!(data = g_key_file_to_data (presets, &data_size, &error))) goto convert_failed; /* write presets */ if (!g_file_set_contents (preset_path, data, data_size, &error)) goto write_failed; g_free (data); return TRUE; /* ERRORS */ no_presets: { GST_WARNING_OBJECT (preset, "no presets, trying to unlink possibly existing preset file: '%s'", preset_path); g_unlink (preset_path); return FALSE; } convert_failed: { GST_WARNING_OBJECT (preset, "can not get the keyfile contents: %s", error->message); g_error_free (error); g_free (data); return FALSE; } write_failed: { GST_WARNING_OBJECT (preset, "Unable to store preset file %s: %s", preset_path, error->message); g_error_free (error); g_free (data); return FALSE; } } /* save the preset with the given name */ static gboolean gst_preset_default_save_preset (GstPreset * preset, const gchar * name) { GKeyFile *presets; gchar **props; guint i; GObjectClass *gclass; gboolean is_child_proxy; GST_INFO_OBJECT (preset, "saving new preset: %s", name); /* get the presets from the type */ if (!(presets = preset_get_keyfile (preset))) goto no_presets; /* take copies of current gobject properties from preset */ if (!(props = gst_preset_get_property_names (preset))) goto no_properties; gclass = G_OBJECT_CLASS (GST_ELEMENT_GET_CLASS (preset)); is_child_proxy = GST_IS_CHILD_PROXY (preset); /* loop over the object properties and store the property value in the * keyfile */ for (i = 0; props[i]; i++) { GValue gvalue = { 0, }; gchar *str; GParamSpec *property = NULL; if (is_child_proxy) { gst_child_proxy_lookup ((GstChildProxy *) preset, props[i], NULL, &property); } else { property = g_object_class_find_property (gclass, props[i]); } if (!property) { /* the element said it supported the property but then it does not have * that property. This should not happen. */ GST_WARNING_OBJECT (preset, "property '%s' not in object", props[i]); continue; } g_value_init (&gvalue, property->value_type); if (is_child_proxy) { gst_child_proxy_get_property ((GstChildProxy *) preset, props[i], &gvalue); } else { g_object_get_property ((GObject *) preset, props[i], &gvalue); } if ((str = gst_value_serialize (&gvalue))) { g_key_file_set_string (presets, name, props[i], (gpointer) str); g_free (str); } else { GST_WARNING_OBJECT (preset, "serialization for property '%s' failed", props[i]); } g_value_unset (&gvalue); } GST_INFO_OBJECT (preset, " saved"); g_strfreev (props); /* save updated version */ return gst_preset_default_save_presets_file (preset); /* ERRORS */ no_presets: { GST_WARNING_OBJECT (preset, "no presets"); return FALSE; } no_properties: { GST_INFO_OBJECT (preset, "no properties"); return FALSE; } } /* copies all keys and comments from one group to another, deleting the old * group. */ static gboolean gst_preset_default_rename_preset (GstPreset * preset, const gchar * old_name, const gchar * new_name) { GKeyFile *presets; gchar *str; gchar **keys; gsize i, num_keys; /* get the presets from the type */ if (!(presets = preset_get_keyfile (preset))) goto no_presets; if (!g_key_file_has_group (presets, old_name)) goto no_group; /* copy group comment if there is any */ if ((str = g_key_file_get_comment (presets, old_name, NULL, NULL))) { g_key_file_set_comment (presets, new_name, NULL, str, NULL); g_free (str); } /* get all keys from the old group and copy them in the new group */ keys = g_key_file_get_keys (presets, old_name, &num_keys, NULL); for (i = 0; i < num_keys; i++) { /* copy key comment if there is any */ if ((str = g_key_file_get_comment (presets, old_name, keys[i], NULL))) { g_key_file_set_comment (presets, new_name, keys[i], str, NULL); g_free (str); } /* copy key value */ str = g_key_file_get_value (presets, old_name, keys[i], NULL); g_key_file_set_value (presets, new_name, keys[i], str); g_free (str); } g_strfreev (keys); /* remove old group */ g_key_file_remove_group (presets, old_name, NULL); /* save updated version */ return gst_preset_default_save_presets_file (preset); /* ERRORS */ no_presets: { GST_WARNING_OBJECT (preset, "no presets"); return FALSE; } no_group: { GST_WARNING_OBJECT (preset, "no preset named %s", old_name); return FALSE; } } /* delete a group from the keyfile */ static gboolean gst_preset_default_delete_preset (GstPreset * preset, const gchar * name) { GKeyFile *presets; /* get the presets from the type */ if (!(presets = preset_get_keyfile (preset))) goto no_presets; /* get the group */ if (!g_key_file_has_group (presets, name)) goto no_group; /* remove the group */ g_key_file_remove_group (presets, name, NULL); /* save updated version */ return gst_preset_default_save_presets_file (preset); /* ERRORS */ no_presets: { GST_WARNING_OBJECT (preset, "no presets"); return FALSE; } no_group: { GST_WARNING_OBJECT (preset, "no preset named %s", name); return FALSE; } } static gboolean gst_preset_default_set_meta (GstPreset * preset, const gchar * name, const gchar * tag, const gchar * value) { GKeyFile *presets; gchar *key; /* get the presets from the type */ if (!(presets = preset_get_keyfile (preset))) goto no_presets; key = g_strdup_printf ("_meta/%s", tag); if (value && *value) { g_key_file_set_value (presets, name, key, value); } else { g_key_file_remove_key (presets, name, key, NULL); } g_free (key); /* save updated keyfile */ return gst_preset_default_save_presets_file (preset); /* ERRORS */ no_presets: { GST_WARNING_OBJECT (preset, "no presets"); return FALSE; } } /* the caller must free @value after usage */ static gboolean gst_preset_default_get_meta (GstPreset * preset, const gchar * name, const gchar * tag, gchar ** value) { GKeyFile *presets; gchar *key; /* get the presets from the type */ if (!(presets = preset_get_keyfile (preset))) goto no_presets; key = g_strdup_printf ("_meta/%s", tag); *value = g_key_file_get_value (presets, name, key, NULL); g_free (key); return TRUE; /* ERRORS */ no_presets: { GST_WARNING_OBJECT (preset, "no presets"); *value = NULL; return FALSE; } } /* wrapper */ /** * gst_preset_get_preset_names: * @preset: a #GObject that implements #GstPreset * * Get a copy of preset names as a NULL terminated string array. * * Returns: (transfer full) (array zero-terminated=1) (element-type gchar*): * list with names, ue g_strfreev() after usage. */ gchar ** gst_preset_get_preset_names (GstPreset * preset) { g_return_val_if_fail (GST_IS_PRESET (preset), NULL); return (GST_PRESET_GET_INTERFACE (preset)->get_preset_names (preset)); } /** * gst_preset_get_property_names: * @preset: a #GObject that implements #GstPreset * * Get a the names of the GObject properties that can be used for presets. * * Returns: (transfer full) (array zero-terminated=1) (element-type gchar*): an * array of property names which should be freed with g_strfreev() after use. */ gchar ** gst_preset_get_property_names (GstPreset * preset) { g_return_val_if_fail (GST_IS_PRESET (preset), NULL); return (GST_PRESET_GET_INTERFACE (preset)->get_property_names (preset)); } /** * gst_preset_load_preset: * @preset: a #GObject that implements #GstPreset * @name: preset name to load * * Load the given preset. * * Returns: %TRUE for success, %FALSE if e.g. there is no preset with that @name */ gboolean gst_preset_load_preset (GstPreset * preset, const gchar * name) { g_return_val_if_fail (GST_IS_PRESET (preset), FALSE); g_return_val_if_fail (name, FALSE); return (GST_PRESET_GET_INTERFACE (preset)->load_preset (preset, name)); } /** * gst_preset_save_preset: * @preset: a #GObject that implements #GstPreset * @name: preset name to save * * Save the current object settings as a preset under the given name. If there * is already a preset by this @name it will be overwritten. * * Returns: %TRUE for success, %FALSE */ gboolean gst_preset_save_preset (GstPreset * preset, const gchar * name) { g_return_val_if_fail (GST_IS_PRESET (preset), FALSE); g_return_val_if_fail (name, FALSE); return (GST_PRESET_GET_INTERFACE (preset)->save_preset (preset, name)); } /** * gst_preset_rename_preset: * @preset: a #GObject that implements #GstPreset * @old_name: current preset name * @new_name: new preset name * * Renames a preset. If there is already a preset by the @new_name it will be * overwritten. * * Returns: %TRUE for success, %FALSE if e.g. there is no preset with @old_name */ gboolean gst_preset_rename_preset (GstPreset * preset, const gchar * old_name, const gchar * new_name) { g_return_val_if_fail (GST_IS_PRESET (preset), FALSE); g_return_val_if_fail (old_name, FALSE); g_return_val_if_fail (new_name, FALSE); return (GST_PRESET_GET_INTERFACE (preset)->rename_preset (preset, old_name, new_name)); } /** * gst_preset_delete_preset: * @preset: a #GObject that implements #GstPreset * @name: preset name to remove * * Delete the given preset. * * Returns: %TRUE for success, %FALSE if e.g. there is no preset with that @name */ gboolean gst_preset_delete_preset (GstPreset * preset, const gchar * name) { g_return_val_if_fail (GST_IS_PRESET (preset), FALSE); g_return_val_if_fail (name, FALSE); return (GST_PRESET_GET_INTERFACE (preset)->delete_preset (preset, name)); } /** * gst_preset_set_meta: * @preset: a #GObject that implements #GstPreset * @name: preset name * @tag: meta data item name * @value: new value * * Sets a new @value for an existing meta data item or adds a new item. Meta * data @tag names can be something like e.g. "comment". Supplying %NULL for the * @value will unset an existing value. * * Returns: %TRUE for success, %FALSE if e.g. there is no preset with that @name */ gboolean gst_preset_set_meta (GstPreset * preset, const gchar * name, const gchar * tag, const gchar * value) { g_return_val_if_fail (GST_IS_PRESET (preset), FALSE); g_return_val_if_fail (name, FALSE); g_return_val_if_fail (tag, FALSE); return GST_PRESET_GET_INTERFACE (preset)->set_meta (preset, name, tag, value); } /** * gst_preset_get_meta: * @preset: a #GObject that implements #GstPreset * @name: preset name * @tag: meta data item name * @value: (out callee-allocates): value * * Gets the @value for an existing meta data @tag. Meta data @tag names can be * something like e.g. "comment". Returned values need to be released when done. * * Returns: %TRUE for success, %FALSE if e.g. there is no preset with that @name * or no value for the given @tag */ gboolean gst_preset_get_meta (GstPreset * preset, const gchar * name, const gchar * tag, gchar ** value) { g_return_val_if_fail (GST_IS_PRESET (preset), FALSE); g_return_val_if_fail (name, FALSE); g_return_val_if_fail (tag, FALSE); g_return_val_if_fail (value, FALSE); return GST_PRESET_GET_INTERFACE (preset)->get_meta (preset, name, tag, value); } /** * gst_preset_set_app_dir: * @app_dir: the application specific preset dir * * Sets an extra directory as an absolute path that should be considered when * looking for presets. Any presets in the application dir will shadow the * system presets. * * Returns: %TRUE for success, %FALSE if the dir already has been set */ gboolean gst_preset_set_app_dir (const gchar * app_dir) { g_return_val_if_fail (app_dir, FALSE); if (!preset_app_dir) { preset_app_dir = g_strdup (app_dir); return TRUE; } return FALSE; } /** * gst_preset_get_app_dir: * * Gets the directory for application specific presets if set by the * application. * * Returns: the directory or %NULL, don't free or modify the string */ const gchar * gst_preset_get_app_dir (void) { return preset_app_dir; } /* class internals */ static void gst_preset_class_init (GstPresetInterface * iface) { iface->get_preset_names = gst_preset_default_get_preset_names; iface->get_property_names = gst_preset_default_get_property_names; iface->load_preset = gst_preset_default_load_preset; iface->save_preset = gst_preset_default_save_preset; iface->rename_preset = gst_preset_default_rename_preset; iface->delete_preset = gst_preset_default_delete_preset; iface->set_meta = gst_preset_default_set_meta; iface->get_meta = gst_preset_default_get_meta; } static void gst_preset_base_init (gpointer g_class) { static gboolean initialized = FALSE; if (!initialized) { /* init default implementation */ GST_DEBUG_CATEGORY_INIT (GST_CAT_DEFAULT, "preset", GST_DEBUG_FG_WHITE | GST_DEBUG_BG_BLACK, "preset interface"); /* create quarks for use with g_type_{g,s}et_qdata() */ preset_quark = g_quark_from_static_string ("GstPreset::presets"); preset_user_path_quark = g_quark_from_static_string ("GstPreset::user_path"); preset_app_path_quark = g_quark_from_static_string ("GstPreset::app_path"); preset_system_path_quark = g_quark_from_static_string ("GstPreset::system_path"); #if 0 property_list_quark = g_quark_from_static_string ("GstPreset::properties"); /* create interface properties, each element would need to override this * g_object_class_override_property(gobject_class, PROP_PRESET_NAME, "preset-name"); * and in _set_property() do * case PROP_PRESET_NAME: { * gchar *name = g_value_get_string (value); * if (name) * gst_preset_load_preset(preset, name); * } break; */ g_object_interface_install_property (g_class, g_param_spec_string ("preset-name", "preset-name property", "load given preset", NULL, G_PARAM_WRITABLE)); #endif initialized = TRUE; } } GType gst_preset_get_type (void) { static volatile gsize type = 0; if (g_once_init_enter (&type)) { GType _type; const GTypeInfo info = { sizeof (GstPresetInterface), (GBaseInitFunc) gst_preset_base_init, /* base_init */ NULL, /* base_finalize */ (GClassInitFunc) gst_preset_class_init, /* class_init */ NULL, /* class_finalize */ NULL, /* class_data */ 0, 0, /* n_preallocs */ NULL /* instance_init */ }; _type = g_type_register_static (G_TYPE_INTERFACE, "GstPreset", &info, 0); g_once_init_leave (&type, _type); } return type; }