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/*
* FILE: pdb.c
* PROGRAM: RAT
* AUTHOR: O.Hodson
*
* Copyright (c) 1999-2001 University College London
* All rights reserved.
*
* These functions provide a means of maintaining persistent
* information on conference participants that is not contained in the
* RTCP database. Entries are stored in a binary tree, identified
* with a unique 32 bit unsigned identifer (probably the same as
* SSRC).
*/
#ifndef HIDE_SOURCE_STRINGS
static const char cvsid[] =
"$Id: pdb.c,v 1.27 2001/01/08 20:30:05 ucaccsp Exp $";
#endif /* HIDE_SOURCE_STRINGS */
#include "config_unix.h"
#include "config_win32.h"
#include "debug.h"
#include "memory.h"
#include "btree.h"
#include "channel_types.h"
#include "audio_types.h"
#include "codec_types.h"
#include "session.h"
#include "pdb.h"
struct s_pdb {
btree_t *db;
uint32_t nelem;
};
int
pdb_create(pdb_t **pp)
{
pdb_t *p;
p = (pdb_t*)xmalloc(sizeof(pdb_t));
if (p == NULL) {
*pp = NULL;
return FALSE;
}
if (btree_create(&p->db) == FALSE) {
xfree(p);
*pp = NULL;
return FALSE;
}
p->nelem = 0;
*pp = p;
return TRUE;
}
int
pdb_destroy(pdb_t **pp)
{
pdb_t *p = *pp;
uint32_t id;
while(pdb_get_first_id(p, &id)) {
if (pdb_item_destroy(p, id) == FALSE) {
debug_msg("Failed to destroy item\n");
return FALSE;
}
}
if (btree_destroy(&p->db) == FALSE) {
debug_msg("Failed to destroy tree\n");
return FALSE;
}
xfree(p);
*pp = NULL;
return TRUE;
}
uint32_t
pdb_item_count(pdb_t *p)
{
return p->nelem;
}
int
pdb_get_first_id(pdb_t *p, uint32_t *id)
{
return btree_get_min_key(p->db, id);
}
int
pdb_get_next_id(pdb_t *p, uint32_t cur, uint32_t *next)
{
return btree_get_next_key(p->db, cur, next);
}
int
pdb_item_get(pdb_t *p, uint32_t id, pdb_entry_t **item)
{
void *v;
if (btree_find(p->db, id, &v) == FALSE) {
*item = NULL;
return FALSE;
}
assert(v != NULL);
*item = (pdb_entry_t*)v;
pdb_item_validate(*item);
return TRUE;
}
int
pdb_item_create(pdb_t *p, uint16_t freq, uint32_t id)
{
pdb_entry_t *item;
timestamp_t zero_ts;
if (btree_find(p->db, id, (void**)&item)) {
debug_msg("Item already exists\n");
return FALSE;
}
item = (pdb_entry_t*)xmalloc(sizeof(pdb_entry_t));
if (item == NULL) {
return FALSE;
}
/* Initialize elements of item here as necesary **********************/
item->magic = 0xc001babe;
item->ssrc = id;
item->render_3D_data = NULL;
item->enc = -1;
item->enc_fmt_len = 2 * (CODEC_LONG_NAME_LEN + 1);
item->enc_fmt = xmalloc(item->enc_fmt_len);
item->sample_rate = freq;
item->gain = 1.0;
item->mute = 0;
zero_ts = ts_map32(8000, 0);
item->last_ui_update = zero_ts;
item->first_mix = TRUE;
/* Initial jitter estimate (30ms) */
item->jitter = ts_map32(8000, 240);
item->transit = zero_ts;
item->last_transit = zero_ts;
item->last_last_transit = zero_ts;
item->avg_transit = zero_ts;
item->playout = zero_ts;
item->last_arr = zero_ts;
item->last_rtt = 0.0;
item->avg_rtt = 0.0;
/* Packet stats initialization */
item->received = 0;
item->duplicates = 0;
item->misordered = 0;
item->jit_toged = 0;
item->spike_toged = 0;
item->spike_events = 0;
pdb_item_validate(item);
/*********************************************************************/
if (btree_add(p->db, id, (void*)item) == FALSE) {
debug_msg("failed to add item to persistent database!\n");
return FALSE;
}
p->nelem++;
return TRUE;
}
int
pdb_item_destroy(pdb_t *p, uint32_t id)
{
pdb_entry_t *item;
if (btree_remove(p->db, id, (void**)&item) == FALSE) {
debug_msg("Cannot delete item because it does not exist!\n");
return FALSE;
}
pdb_item_validate(item);
assert(id == item->ssrc);
/* clean up elements of item here ************************************/
if (item->render_3D_data != NULL) {
render_3D_free(&item->render_3D_data);
}
if (item->enc_fmt != NULL) {
xfree(item->enc_fmt);
item->enc_fmt = NULL;
}
/*********************************************************************/
debug_msg("Removing persistent database entry for SSRC 0x%08lx\n",
item->ssrc);
xfree(item);
p->nelem--;
return TRUE;
}
void
pdb_item_validate(pdb_entry_t *item)
{
assert(item != NULL);
assert(item->magic == 0xc001babe);
}
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