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/*
* The Real SoundTracker - time buffer
*
* Copyright (C) 1999 Michael Krause
*
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "time-buffer.h"
#include <glib.h>
/* This implementation of the time buffer interface might be rather
suboptimal... */
struct time_buffer {
GMutex *mutex;
GList *list;
};
typedef struct time_buffer_item {
double time;
/* then user data follows */
} time_buffer_item;
time_buffer *
time_buffer_new (double maxtimedelta)
{
time_buffer *t = g_new(time_buffer, 1);
if(t) {
t->mutex = g_mutex_new();
t->list = NULL;
}
return t;
}
void
time_buffer_destroy (time_buffer *t)
{
if(t) {
g_list_free(t->list);
g_mutex_free(t->mutex);
g_free(t);
}
}
void
time_buffer_clear (time_buffer *t)
{
while(t->list) {
g_free(t->list->data);
t->list = g_list_remove_link(t->list, t->list);
}
}
gboolean
time_buffer_add (time_buffer *t,
void *item,
double time)
{
time_buffer_item *a = item;
g_mutex_lock(t->mutex);
a->time = time;
t->list = g_list_append(t->list, a);
g_mutex_unlock(t->mutex);
return TRUE;
}
void *
time_buffer_get (time_buffer *t,
double time)
{
int i, j, l;
void *result = NULL;
GList *list;
g_mutex_lock(t->mutex);
l = g_list_length(t->list);
if(l == 0) {
g_mutex_unlock(t->mutex);
return NULL;
}
for(i = 0, list = t->list; i < l - 1; i++, list = list->next) {
time_buffer_item *a = list->data;
if(time < a->time)
break;
}
for(j = 0; j < i - 1; j++) {
GList *node = t->list;
g_free(node->data);
t->list = g_list_remove_link(t->list, node);
g_list_free(node);
}
result = t->list->data;
g_mutex_unlock(t->mutex);
return result;
}
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