gstreamer/ges/ges-keyfile-formatter.c

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/* GStreamer Editing Services
* Copyright (C) 2010 Brandon Lewis <brandon.lewis@collabora.co.uk>
* 2010 Nokia Corporation
*
* 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:ges-keyfile-formatter
* @short_description: GKeyFile formatter
**/
#include <gst/gst.h>
#include <stdlib.h>
#include "ges.h"
#include "ges-internal.h"
G_DEFINE_TYPE (GESKeyfileFormatter, ges_keyfile_formatter, GES_TYPE_FORMATTER);
/* for ini format */
static gboolean save_keyfile (GESFormatter * keyfile_formatter,
GESTimeline * timeline);
static gboolean load_keyfile (GESFormatter * keyfile_formatter,
GESTimeline * timeline);
static void
ges_keyfile_formatter_class_init (GESKeyfileFormatterClass * klass)
{
GESFormatterClass *formatter_klass;
formatter_klass = GES_FORMATTER_CLASS (klass);
formatter_klass->save = save_keyfile;
formatter_klass->load = load_keyfile;
}
static void
ges_keyfile_formatter_init (GESKeyfileFormatter * object)
{
}
/**
* ges_keyfile_formatter_new:
*
* Creates a new #GESKeyfileFormatter.
*
* Returns: The newly created #GESKeyfileFormatter.
*/
GESKeyfileFormatter *
ges_keyfile_formatter_new (void)
{
return g_object_new (GES_TYPE_KEYFILE_FORMATTER, NULL);
}
static gboolean
save_keyfile (GESFormatter * keyfile_formatter, GESTimeline * timeline)
{
GKeyFile *kf;
GList *tmp, *tracks, *layers;
int i = 0;
int n_objects = 0;
gchar buffer[255];
gchar *data;
gsize length;
GST_DEBUG ("saving keyfile_formatter");
kf = g_key_file_new ();
g_key_file_set_value (kf, "General", "version", "1");
tracks = ges_timeline_get_tracks (timeline);
for (i = 0, tmp = tracks; tmp; i++, tmp = tmp->next) {
GESTrack *track;
gchar *type;
gchar *caps;
GValue v = { 0 };
track = GES_TRACK (tmp->data);
g_snprintf (buffer, 255, "Track%d", i);
g_value_init (&v, GES_TYPE_TRACK_TYPE);
g_object_get_property (G_OBJECT (track), "track-type", &v);
type = gst_value_serialize (&v);
caps = gst_caps_to_string (ges_track_get_caps (track));
g_key_file_set_value (kf, buffer, "type", type);
g_key_file_set_string (kf, buffer, "caps", caps);
g_free (caps);
g_free (type);
gst_object_unref (track);
tmp->data = NULL;
}
g_list_free (tracks);
layers = ges_timeline_get_layers (timeline);
for (i = 0, tmp = layers; tmp; i++, tmp = tmp->next) {
const gchar *type;
GESTimelineLayer *layer;
GList *objs, *cur;
layer = tmp->data;
g_snprintf (buffer, 255, "Layer%d", i);
if (GES_IS_SIMPLE_TIMELINE_LAYER (tmp->data)) {
type = "simple";
} else {
type = "default";
}
g_key_file_set_integer (kf, buffer, "priority",
ges_timeline_layer_get_priority (layer));
g_key_file_set_value (kf, buffer, "type", type);
objs = ges_timeline_layer_get_objects (layer);
for (cur = objs; cur; cur = cur->next) {
GESTimelineObject *obj;
GParamSpec **properties;
guint i, n;
obj = GES_TIMELINE_OBJECT (cur->data);
properties =
g_object_class_list_properties (G_OBJECT_GET_CLASS (obj), &n);
g_snprintf (buffer, 255, "Object%d", n_objects);
n_objects++;
g_key_file_set_value (kf, buffer, "type",
G_OBJECT_TYPE_NAME (G_OBJECT (obj)));
for (i = 0; i < n; i++) {
GValue v = { 0 };
gchar *serialized;
GParamSpec *p = properties[i];
g_value_init (&v, p->value_type);
g_object_get_property (G_OBJECT (obj), p->name, &v);
/* FIXME: does this work for properties marked G_PARAM_CONSTRUCT_ONLY?
* */
if ((p->flags & G_PARAM_READABLE) && (p->flags & G_PARAM_WRITABLE)) {
if (!(serialized = gst_value_serialize (&v)))
continue;
g_key_file_set_string (kf, buffer, p->name, serialized);
g_free (serialized);
}
g_value_unset (&v);
}
g_free (properties);
g_object_unref (obj);
cur->data = NULL;
}
g_list_free (objs);
}
g_list_foreach (layers, (GFunc) g_object_unref, NULL);
g_list_free (layers);
data = g_key_file_to_data (kf, &length, NULL);
ges_formatter_set_data (keyfile_formatter, data, length);
g_key_file_free (kf);
return TRUE;
}
static gboolean
create_track (GKeyFile * kf, gchar * group, GESTimeline * timeline)
{
GESTrack *track;
GstCaps *caps;
gchar *caps_field, *type_field;
gboolean res;
GValue v = { 0 };
if (!(caps_field = g_key_file_get_string (kf, group, "caps", NULL)))
return FALSE;
caps = gst_caps_from_string (caps_field);
g_free (caps_field);
if (!(type_field = g_key_file_get_value (kf, group, "type", NULL)))
return FALSE;
g_value_init (&v, GES_TYPE_TRACK_TYPE);
res = gst_value_deserialize (&v, type_field);
g_free (type_field);
if (!caps || !res)
return FALSE;
track = ges_track_new (g_value_get_flags (&v), caps);
if (!ges_timeline_add_track (timeline, track)) {
g_object_unref (track);
return FALSE;
}
return TRUE;
}
static GESTimelineLayer *
create_layer (GKeyFile * kf, gchar * group, GESTimeline * timeline)
{
GESTimelineLayer *ret = NULL;
gchar *type_field, *priority_field;
gboolean is_simple;
guint priority;
if (!(type_field = g_key_file_get_value (kf, group, "type", NULL)))
return FALSE;
is_simple = g_str_equal (type_field, "simple");
g_free (type_field);
if (!(priority_field = g_key_file_get_value (kf, group, "priority", NULL)))
return FALSE;
priority = strtoul (priority_field, NULL, 10);
g_free (priority_field);
if (is_simple) {
GESSimpleTimelineLayer *simple;
simple = ges_simple_timeline_layer_new ();
ret = (GESTimelineLayer *) simple;
} else {
ret = ges_timeline_layer_new ();
}
ges_timeline_layer_set_priority (ret, priority);
if (!ges_timeline_add_layer (timeline, ret)) {
g_object_unref (ret);
ret = NULL;
}
return ret;
}
static gboolean
create_object (GKeyFile * kf, gchar * group, GESTimelineLayer * layer)
{
GType type;
gchar *type_name;
GObject *obj;
GESTimelineObject *timeline_obj;
gchar **keys;
gsize n_keys, i;
GParamSpec *pspec;
GObjectClass *klass;
GParameter *params, *p;
gboolean ret = FALSE;
GST_INFO ("processing '%s'", group);
/* get a reference to the object class */
if (!(type_name = g_key_file_get_value (kf, group, "type", NULL))) {
GST_ERROR ("no type name for object '%s'", group);
return FALSE;
}
if (!(type = g_type_from_name (type_name))) {
GST_ERROR ("invalid type name '%s'", type_name);
goto fail_free_type_name;
}
if (!(klass = g_type_class_ref (type))) {
GST_ERROR ("couldn't get class ref");
goto fail_free_type_name;
}
if (!(keys = g_key_file_get_keys (kf, group, &n_keys, NULL)))
goto fail_unref_class;
/* create an array of parameters for the call to g_new0 */
/* skip first field 'type' */
if (!(params = g_new0 (GParameter, (n_keys - 1)))) {
GST_ERROR ("couldn't allocate parameter list");
goto fail_free_keys;
}
GST_DEBUG ("processing parameter list '%s'", group);
for (p = params, i = 1; i < n_keys; i++, p++) {
gchar *value;
gchar *key;
key = keys[i];
GST_DEBUG ("processing key '%s'", key);
/* find the param spec for this property */
if (!(pspec = g_object_class_find_property (klass, key))) {
GST_ERROR ("Object type %s has no property %s", type_name, key);
goto fail_free_params;
}
p->name = key;
g_value_init (&p->value, pspec->value_type);
/* assume this is going to work */
value = g_key_file_get_string (kf, group, key, NULL);
if (!gst_value_deserialize (&p->value, value)) {
GST_ERROR ("Couldn't read property value '%s' for property '%s'",
key, value);
goto fail_free_params;
}
g_free (value);
}
/* create the object from the supplied type name */
if (!(obj = g_object_newv (type, (n_keys - 1), params))) {
GST_ERROR ("couldn't create object");
goto fail_free_type_name;
}
/* check that we have a subclass of GESTimelineObject */
if (!GES_IS_TIMELINE_OBJECT (obj)) {
GST_ERROR ("'%s' is not a subclass of GESTimelineObject!", type_name);
goto fail_unref_obj;
}
timeline_obj = (GESTimelineObject *) obj;
/* add the object to the layer */
if (GES_IS_SIMPLE_TIMELINE_LAYER (layer)) {
if (!ges_simple_timeline_layer_add_object ((GESSimpleTimelineLayer *)
layer, timeline_obj, -1)) {
goto fail_unref_obj;
}
} else {
if (!ges_timeline_layer_add_object (layer, timeline_obj)) {
goto fail_unref_obj;
}
}
ret = TRUE;
fail_unref_obj:
if (!ret)
g_object_unref (obj);
fail_free_params:
for (p = params, i = 1; i < n_keys; i++, p++) {
g_value_unset (&p->value);
}
g_free (params);
fail_free_keys:
g_strfreev (keys);
fail_unref_class:
g_type_class_unref (klass);
fail_free_type_name:
g_free (type_name);
return ret;
}
static gboolean
load_keyfile (GESFormatter * keyfile_formatter, GESTimeline * timeline)
{
GKeyFile *kf;
GError *error = NULL;
gboolean ret = TRUE;
gchar **groups;
gsize n_groups, i;
GESTimelineLayer *cur_layer = NULL;
gchar *data;
gsize length;
kf = g_key_file_new ();
data = ges_formatter_get_data (keyfile_formatter, &length);
if (!g_key_file_load_from_data (kf, data, length, G_KEY_FILE_NONE, &error)) {
ret = FALSE;
2011-01-27 16:43:47 +00:00
GST_ERROR ("%s", error->message);
GST_INFO ("%s", data);
goto free_kf;
}
if (!(groups = g_key_file_get_groups (kf, &n_groups))) {
goto free_kf;
}
for (i = 0; i < n_groups; i++) {
gchar *group = groups[i];
if (g_str_has_prefix (group, "Track")) {
if (!create_track (kf, group, timeline)) {
GST_ERROR ("couldn't create object for %s", group);
ret = FALSE;
break;
}
}
else if (g_str_has_prefix (group, "Layer")) {
if (!(cur_layer = create_layer (kf, group, timeline))) {
GST_ERROR ("couldn't create object for %s", group);
ret = FALSE;
break;
}
}
else if (g_str_has_prefix (group, "Object")) {
if (!cur_layer) {
GST_ERROR ("Group %s occurs outside of Layer", group);
ret = FALSE;
break;
}
if (!create_object (kf, group, cur_layer)) {
GST_ERROR ("couldn't create object for %s", group);
ret = FALSE;
break;
}
}
else if (g_str_equal (group, "General")) {
continue;
}
else {
GST_ERROR ("Unrecognized group name %s", group);
ret = FALSE;
break;
}
}
g_strfreev (groups);
free_kf:
g_key_file_free (kf);
return ret;
}