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/*
* Copyright (C) 2000-2001 the xine project
*
* This file is part of xine, a unix video player.
*
* xine 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.
*
* xine 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
*
* $Id: lrb.c,v 1.2 2001/11/17 14:26:39 f1rmb Exp $
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <assert.h>
#include "lrb.h"
#include "xineutils.h"
lrb_t *lrb_new (int max_num_entries,
fifo_buffer_t *fifo) {
lrb_t *this;
this = xine_xmalloc (sizeof (lrb_t));
this->max_num_entries = max_num_entries;
this->cur_num_entries = 0;
this->fifo = fifo;
this->newest = NULL;
this->oldest = NULL;
return this;
}
void lrb_drop (lrb_t *this) {
buf_element_t *buf = this->oldest;
assert (buf);
this->oldest = buf->next;
buf->free_buffer (buf);
this->cur_num_entries--;
}
void lrb_add (lrb_t *this, buf_element_t *buf) {
if (!this->newest) {
this->newest = buf;
this->oldest = buf;
buf->next = NULL;
this->cur_num_entries = 1;
} else {
if (this->cur_num_entries >= this->max_num_entries)
lrb_drop (this);
buf->next = NULL;
this->newest->next = buf;
this->newest = buf;
this->cur_num_entries++;
}
printf ("lrb: %d elements in buffer\n", this->cur_num_entries);
}
void lrb_feedback (lrb_t *this, fifo_buffer_t *fifo) {
pthread_mutex_lock (&fifo->mutex);
while (this->cur_num_entries) {
buf_element_t *buf = this->oldest;
buf->next = fifo->first;
fifo->first = buf;
if (!fifo->last)
fifo->last = buf;
fifo->fifo_size++;
pthread_cond_signal (&fifo->not_empty);
this->oldest = buf->next;
this->cur_num_entries--;
printf ("lrb: feedback\n");
}
if (!this->oldest)
this->newest = NULL;
pthread_mutex_unlock (&fifo->mutex);
}
void lrb_flush (lrb_t *this) {
while (this->cur_num_entries)
lrb_drop (this);
}
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