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/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wim.taymans@chello.be>
*
* gstquery.c: GstQueryType registration
*
* 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.
*/
#include <string.h>
#include "gstlog.h"
#include "gstquery.h"
static GList *_gst_queries = NULL;
static GHashTable *_nick_to_query = NULL;
static GHashTable *_query_type_to_nick = NULL;
static gint _n_values = 1; /* we start from 1 because 0 reserved for NONE */
static GstQueryTypeDefinition standard_definitions[] = {
{ GST_QUERY_TOTAL, "total", "Total length" },
{ GST_QUERY_POSITION, "position", "Current Position" },
{ GST_QUERY_LATENCY, "latency", "Latency" },
{ GST_QUERY_JITTER, "jitter", "Jitter" },
{ GST_QUERY_START, "start", "Start position of stream" },
{ GST_QUERY_SEGMENT_END, "segment_end", "End position of the stream" },
{ GST_QUERY_RATE, "rate", "Configured rate 1000000 = 1" },
{ 0, NULL, NULL }
};
void
_gst_query_type_initialize (void)
{
GstQueryTypeDefinition *standards = standard_definitions;
if (_nick_to_query == NULL) {
_nick_to_query = g_hash_table_new (g_str_hash, g_str_equal);
_query_type_to_nick = g_hash_table_new (NULL, NULL);
}
while (standards->nick) {
g_hash_table_insert (_nick_to_query, standards->nick, standards);
g_hash_table_insert (_query_type_to_nick, GINT_TO_POINTER (standards->value), standards);
_gst_queries = g_list_append (_gst_queries, standards);
standards++;
_n_values++;
}
}
/**
* gst_query_type_register:
* @nick: The nick of the new query
* @description: The description of the new query
*
* Create a new GstQueryType based on the nick or return an
* allrady registered query with that nick
*
* Returns: A new GstQueryType or an already registered query
* with the same nick.
*/
GstQueryType
gst_query_type_register (const gchar *nick, const gchar *description)
{
GstQueryTypeDefinition *query;
GstQueryType lookup;
g_return_val_if_fail (nick != NULL, 0);
g_return_val_if_fail (description != NULL, 0);
lookup = gst_query_type_get_by_nick (nick);
if (lookup != GST_QUERY_NONE)
return lookup;
query = g_new0 (GstQueryTypeDefinition, 1);
query->value = _n_values;
query->nick = g_strdup (nick);
query->description = g_strdup (description);
g_hash_table_insert (_nick_to_query, query->nick, query);
g_hash_table_insert (_query_type_to_nick, GINT_TO_POINTER (query->value), query);
_gst_queries = g_list_append (_gst_queries, query);
_n_values++;
return query->value;
}
/**
* gst_query_type_get_by_nick:
* @nick: The nick of the query
*
* Return the query registered with the given nick.
*
* Returns: The query with @nick or GST_QUERY_NONE
* if the query was not registered.
*/
GstQueryType
gst_query_type_get_by_nick (const gchar *nick)
{
GstQueryTypeDefinition *query;
g_return_val_if_fail (nick != NULL, 0);
query = g_hash_table_lookup (_nick_to_query, nick);
if (query != NULL)
return query->value;
else
return GST_QUERY_NONE;
}
/**
* gst_query_types_contains:
* @types: The query array to search
* @type: the querytype to find
*
* See if the given query is inside the query array.
*
* Returns: TRUE if the query is found inside the array
*/
gboolean
gst_query_types_contains (const GstQueryType *types, GstQueryType type)
{
if (!types)
return FALSE;
while (*types) {
if (*types == type)
return TRUE;
types++;
}
return FALSE;
}
/**
* gst_query_type_get_details:
* @type: The query to get details of
*
* Get details about the given query.
*
* Returns: The #GstQueryTypeDefinition for @query or NULL on failure.
*/
const GstQueryTypeDefinition*
gst_query_type_get_details (GstQueryType type)
{
return g_hash_table_lookup (_query_type_to_nick, GINT_TO_POINTER (type));
}
/**
* gst_query_type_get_definitions:
*
* Get a list of all the registered query types.
*
* Returns: A GList of #GstQueryTypeDefinition.
*/
const GList*
gst_query_type_get_definitions (void)
{
return _gst_queries;
}
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