/*
 *			GPAC - Multimedia Framework C SDK
 *
 *			Copyright (c) Jean Le Feuvre 2000-2005
 *					All rights reserved
 *
 *  This file is part of GPAC / IETF RTP/RTSP/SDP sub-project
 *
 *  GPAC is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU Lesser General Public License as published by
 *  the Free Software Foundation; either version 2, or (at your option)
 *  any later version.
 *   
 *  GPAC 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 Lesser General Public License for more details.
 *   
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; see the file COPYING.  If not, write to
 *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. 
 *
 */

#include <gpac/internal/ietf_dev.h>
#include <gpac/base_coding.h>

#ifdef _WIN32_WCE
#define RTSP_TRACE		0
#else
#define RTSP_TRACE		1
#endif


GF_Err RTSP_UnpackURL(char *sURL, char *Server, u16 *Port, char *Service, Bool *useTCP)
{
	char schema[10], *test, text[1024], *retest;
	u32 i, len;
	Bool is_ipv6;
	if (!sURL) return GF_BAD_PARAM;

	strcpy(Server, "");
	strcpy(Service, "");
	*Port = *useTCP =0;
	
	if (!strchr(sURL, ':')) return GF_BAD_PARAM;

	//extract the schema
	i = 0;
	while (i<=strlen(sURL)) {
		if (sURL[i] == ':') goto found;
		schema[i] = sURL[i];
		i += 1;
	}
	return GF_BAD_PARAM;

found:
	schema[i] = 0;
	if (stricmp(schema, "rtsp") && stricmp(schema, "rtspu")) return GF_URL_ERROR; 
	//check for user/pass - not allowed
/*
	test = strstr(sURL, "@");
	if (test) return GF_NOT_SUPPORTED;
*/
	test = strstr(sURL, "://");
	if (!test) return GF_URL_ERROR;
	test += 3;
	//check for service
	retest = strstr(test, "/");
	if (!retest) return GF_URL_ERROR;

	if (!stricmp(schema, "rtsp")) *useTCP = 1;

	//check for port
	retest = strrchr(test, ':');
	/*IPV6 address*/
	if (retest && strchr(retest, ']')) retest = NULL;

	if (retest && strstr(retest, "/")) {
		retest += 1;
		i=0;
		while (i<strlen(retest)) {
			if (retest[i] == '/') break;
			text[i] = retest[i];
			i += 1;
		}
		text[i] = 0;
		*Port = atoi(text);
	}
	//get the server name
	is_ipv6 = 0;
	len = strlen(test);
	i=0;
	while (i<len) {
		if (test[i]=='[') is_ipv6 = 1;
		else if (test[i]==']') is_ipv6 = 0;
		if ( (test[i] == '/') || (!is_ipv6 && (test[i] == ':')) ) break;
		text[i] = test[i];
		i += 1;
	}
	text[i] = 0;
	strcpy(Server, text);

	while (test[i] != '/') i += 1;
	strcpy(Service, test+i+1);

	return GF_OK;
}


//create a new GF_RTSPSession from URL - DO NOT USE WITH SDP
GF_EXPORT
GF_RTSPSession *gf_rtsp_session_new(char *sURL, u16 DefaultPort)
{
	GF_RTSPSession *sess;
	char server[1024], service[1024];
	GF_Err e;
	u16 Port;
	Bool UseTCP;
	
	if (!sURL) return NULL;

	e = RTSP_UnpackURL(sURL, server, &Port, service, &UseTCP);
	if (e) return NULL;

	GF_SAFEALLOC(sess, GF_RTSPSession);

	sess->ConnectionType = UseTCP ? GF_SOCK_TYPE_TCP : GF_SOCK_TYPE_UDP;
	if (Port) sess->Port = Port;
	else if (DefaultPort) sess->Port = DefaultPort;
	else sess->Port = 554;

	//HTTP tunnel
	if (sess->Port == 80) {
		sess->ConnectionType = GF_SOCK_TYPE_TCP;
		sess->HasTunnel = 1;
	}	

	sess->Server = strdup(server);
	sess->Service = strdup(service);
	sess->mx = gf_mx_new();
	sess->TCPChannels = gf_list_new();
	gf_rtsp_session_reset(sess, 0);
	return sess;
}


GF_EXPORT
void gf_rtsp_reset_aggregation(GF_RTSPSession *sess)
{
	if (!sess) return;
	
	gf_mx_p(sess->mx);
	if (sess->RTSP_State == GF_RTSP_STATE_WAIT_FOR_CONTROL) {
		strcpy(sess->RTSPLastRequest, "RESET");
		//skip all we haven't recieved
		sess->CSeq += sess->NbPending;
		sess->NbPending = 0;
	}
	sess->RTSP_State = GF_RTSP_STATE_INIT;
	gf_mx_v(sess->mx);
}

void RTSP_AcknowledgeError(GF_RTSPSession *sess)
{
}

void RemoveTCPChannels(GF_RTSPSession *sess)
{
	GF_TCPChan *ch;
	while (gf_list_count(sess->TCPChannels)) {
		ch = (GF_TCPChan*)gf_list_get(sess->TCPChannels, 0);
		free(ch);
		gf_list_rem(sess->TCPChannels, 0);
	}
}


GF_EXPORT
void gf_rtsp_session_reset(GF_RTSPSession *sess, Bool ResetConnection)
{
	gf_mx_p(sess->mx);

	sess->last_session_id = NULL;
	sess->NeedConnection = 1;

	if (ResetConnection) {
		if (sess->connection) gf_sk_del(sess->connection);
		sess->connection = NULL;
		if (sess->http) {
			gf_sk_del(sess->http);
			sess->http = NULL;
		}
	}
	
	sess->RTSP_State = GF_RTSP_STATE_INIT;
//	sess->CSeq = sess->NbPending = 0;
	sess->InterID = (u8) -1;
	sess->pck_start = sess->payloadSize = 0;
	sess->CurrentPos = sess->CurrentSize = 0;
	strcpy(sess->RTSPLastRequest, "");
	RemoveTCPChannels(sess);
	gf_mx_v(sess->mx);
}

GF_EXPORT
void gf_rtsp_session_del(GF_RTSPSession *sess)
{
	if (!sess) return;

	gf_rtsp_session_reset(sess, 0);

	if (sess->connection) gf_sk_del(sess->connection);
	if (sess->http) gf_sk_del(sess->http);
	if (sess->Server) free(sess->Server);
	if (sess->Service) free(sess->Service);
	gf_list_del(sess->TCPChannels);
	if (sess->rtsp_pck_buf) free(sess->rtsp_pck_buf);
	gf_mx_del(sess->mx);
	free(sess);
}

GF_EXPORT
u32 gf_rtsp_get_session_state(GF_RTSPSession *sess)
{
	u32 state;
	if (!sess) return GF_RTSP_STATE_INVALIDATED;
	
	gf_mx_p(sess->mx);
	state = sess->RTSP_State;
	gf_mx_v(sess->mx);
	return state;
}

GF_EXPORT
char *gf_rtsp_get_last_request(GF_RTSPSession *sess)
{
	char *ret;
	if (!sess) return NULL;
	gf_mx_p(sess->mx);
	ret = sess->RTSPLastRequest;
	gf_mx_v(sess->mx);
	return ret;
}


//check whether the url contains server and service name
//no thread protection as this is const throughout the session
GF_EXPORT
u32 gf_rtsp_is_my_session(GF_RTSPSession *sess, char *url)
{
	if (!sess) return 0;
	if (!strstr(url, sess->Server)) return 0;
	//same url or sub-url
	if (strstr(url, sess->Service)) return 1;
	return 0;
}

GF_EXPORT
const char *gf_rtsp_get_last_session_id(GF_RTSPSession *sess)
{
	if (!sess) return NULL;
	return sess->last_session_id;
}

GF_EXPORT
char *gf_rtsp_get_server_name(GF_RTSPSession *sess)
{
	if (!sess) return NULL;
	return sess->Server;
}

GF_EXPORT
char *gf_rtsp_get_service_name(GF_RTSPSession *sess)
{
	if (!sess) return NULL;
	return sess->Service;
}

GF_EXPORT
u16 gf_rtsp_get_session_port(GF_RTSPSession *sess)
{
	return (sess ? sess->Port : 0);
}

GF_Err gf_rtsp_check_connection(GF_RTSPSession *sess)
{
	GF_Err e;
	//active, return
	if (!sess->NeedConnection) return GF_OK;

	//socket is destroyed, recreate
	if (!sess->connection) {
		sess->connection = gf_sk_new(sess->ConnectionType);
		if (!sess->connection) return GF_OUT_OF_MEM;
	}
	//the session is down, reconnect
	e = gf_sk_connect(sess->connection, sess->Server, sess->Port);
	if (e) return e;

	if (sess->SockBufferSize) gf_sk_set_buffer_size(sess->connection, 0, sess->SockBufferSize);

	if (!sess->http && sess->HasTunnel) {
		e = gf_rtsp_http_tunnel_start(sess, "toto is the king of RTSP");
		if (e) return e;
	}
	sess->NeedConnection = 0;
	return GF_OK;
}


GF_Err gf_rtsp_send_data(GF_RTSPSession *sess, char *buffer, u32 Size)
{
	GF_Err e;
	u32 Size64;

	e = gf_rtsp_check_connection(sess);
	if (e) return e;

	//RTSP requests on HTTP are base 64 encoded
	if (sess->HasTunnel) {
		char buf64[3000];
		Size64 = gf_base64_encode(buffer, Size, buf64, 3000);
		buf64[Size64] = 0;
		//send on http connection
		return gf_sk_send_wait(sess->http, buf64, Size64, 30);
	} else {
		return gf_sk_send(sess->connection, buffer, Size);
	}
}



static GF_TCPChan *GetTCPChannel(GF_RTSPSession *sess, u8 rtpID, u8 rtcpID, Bool RemoveIt)
{
	GF_TCPChan *ptr;
	u32 i, count = gf_list_count(sess->TCPChannels);
	for (i=0; i<count; i++) {
		ptr = (GF_TCPChan *)gf_list_get(sess->TCPChannels, i);
		if (ptr->rtpID == rtpID) goto exit;;
		if (ptr->rtcpID == rtcpID) goto exit;
	}
	return NULL;
exit:
	if (RemoveIt) gf_list_rem(sess->TCPChannels, i);
	return ptr;
}


GF_Err gf_rtsp_set_deinterleave(GF_RTSPSession *sess)
{
	GF_TCPChan *ch;
	Bool IsRTCP;
	u8 InterID;
	u16 paySize;
	u32 res, Size;
	char *buffer;

	if (!sess) return GF_SERVICE_ERROR;

	Size = sess->CurrentSize - sess->CurrentPos;
	buffer = sess->TCPBuffer + sess->CurrentPos;

	if (!Size) return GF_IP_NETWORK_EMPTY;

	//we do not work with just a header -> force a refill
	if (Size <= 4) return gf_rtsp_refill_buffer(sess);

	//break if we get RTSP response on the wire
	if (!strncmp(buffer, "RTSP", 4)) 
		return GF_IP_NETWORK_EMPTY;

	//new packet
	if (!sess->pck_start && (buffer[0] == '$')) {
		InterID = buffer[1];
		paySize = ((buffer[2] << 8) & 0xFF00) | (buffer[3] & 0xFF);
		/*this may be NULL (data fetched after a teardown) - resync and return*/
		ch = GetTCPChannel(sess, InterID, InterID, 0);

		/*then check wether this is a full packet or a split*/
		if (paySize <= Size-4) {
			if (ch) {
				IsRTCP = (ch->rtcpID == InterID);
				sess->RTSP_SignalData(sess, ch->ch_ptr, buffer+4, paySize, IsRTCP);
			}
			sess->CurrentPos += paySize+4;
			assert(sess->CurrentPos <= sess->CurrentSize);
		} else {
			/*missed end of pck ?*/
			if (sess->payloadSize) {
				ch = GetTCPChannel(sess, sess->InterID, sess->InterID, 0);
				if (ch) {
					IsRTCP = (ch->rtcpID == sess->InterID);
					sess->RTSP_SignalData(sess, ch->ch_ptr, sess->rtsp_pck_buf, sess->payloadSize, IsRTCP);
				}
			}
			sess->InterID = InterID;
			sess->payloadSize = paySize;
			sess->pck_start = Size-4;
			if (sess->rtsp_pck_size < paySize) {
				sess->rtsp_pck_buf = (char *)realloc(sess->rtsp_pck_buf, sizeof(char)*paySize);
				sess->rtsp_pck_size = paySize;
			}
			memcpy(sess->rtsp_pck_buf, buffer+4, Size-4);
			sess->CurrentPos += Size;
			assert(sess->CurrentPos <= sess->CurrentSize);
		}
	} 
	/*end of packet*/
	else if (sess->payloadSize - sess->pck_start <= Size) {
		GF_LOG(GF_LOG_DEBUG, GF_LOG_RTP, ("[RTP over RTSP] Missed begining of packet (%d bytes)\n", Size));

		res = sess->payloadSize - sess->pck_start;
		memcpy(sess->rtsp_pck_buf + sess->pck_start, buffer, res);
		//flush - same as above, don't complain if channel not found
		ch = GetTCPChannel(sess, sess->InterID, sess->InterID, 0);
		if (ch) {
			IsRTCP = (ch->rtcpID == sess->InterID);
			sess->RTSP_SignalData(sess, ch->ch_ptr, sess->rtsp_pck_buf, sess->payloadSize, IsRTCP);
		}
		sess->payloadSize = 0;
		sess->pck_start = 0;
		sess->InterID = (u8) -1;
		sess->CurrentPos += res;
		assert(sess->CurrentPos <= sess->CurrentSize);
	}
	/*middle of packet*/
	else {
		GF_LOG(GF_LOG_DEBUG, GF_LOG_RTP, ("[RTP over RTSP] Missed begining of RTP packet\n"));
		memcpy(sess->rtsp_pck_buf + sess->pck_start, buffer, Size);
		sess->pck_start += Size;
		sess->CurrentPos += Size;
		assert(sess->CurrentPos <= sess->CurrentSize);
	}
	return GF_OK;
}








/*
		Exposed API, thread-safe
*/

GF_Err RTSP_ResetInterleaving(GF_RTSPSession *sess, Bool ResetChannels)
{
	if (!sess) return GF_BAD_PARAM;

	gf_mx_p(sess->mx);
	sess->payloadSize = 0;
	sess->pck_start = 0;
	sess->InterID = (u8) -1;
	if (ResetChannels) RemoveTCPChannels(sess);
	gf_mx_v(sess->mx);
	
	return GF_OK;
}


GF_EXPORT
GF_Err gf_rtsp_session_read(GF_RTSPSession *sess)
{
	GF_Err e;
	if (!sess) return GF_BAD_PARAM;

	gf_mx_p(sess->mx);
	e = gf_rtsp_fill_buffer(sess);
	if (!e) {
		//only read if not RTSP
		while (1) {
			e = gf_rtsp_set_deinterleave(sess);
			if (e) break;
		}
	}
	gf_mx_v(sess->mx);
	return e;
}


GF_EXPORT
u32 gf_rtsp_unregister_interleave(GF_RTSPSession *sess, u8 LowInterID)
{
	GF_TCPChan *ptr;

	gf_mx_p(sess->mx);
	ptr = GetTCPChannel(sess, LowInterID, LowInterID, 1);
	if (ptr) free(ptr);
	gf_mx_v(sess->mx);
	return gf_list_count(sess->TCPChannels);
}

GF_EXPORT
GF_Err gf_rtsp_register_interleave(GF_RTSPSession *sess, void *the_ch, u8 LowInterID, u8 HighInterID)
{
	GF_TCPChan *ptr;

	if (!sess) return GF_BAD_PARAM;

	gf_mx_p(sess->mx);
	//do NOT register twice
	ptr = GetTCPChannel(sess, LowInterID, HighInterID, 0);
	if (!ptr) {
		ptr = (GF_TCPChan *)malloc(sizeof(GF_TCPChan));
		ptr->ch_ptr = the_ch;
		ptr->rtpID = LowInterID;
		ptr->rtcpID = HighInterID;
		gf_list_add(sess->TCPChannels, ptr);
	}
	gf_mx_v(sess->mx);
	return GF_OK;
}


GF_EXPORT
GF_Err gf_rtsp_set_interleave_callback(GF_RTSPSession *sess,
						GF_Err (*SignalData)(GF_RTSPSession *sess, void *chan, char *buffer, u32 bufferSize, Bool IsRTCP)
				)
{
	if (!sess) return GF_BAD_PARAM;

	gf_mx_p(sess->mx);

	//only if existing
	if (SignalData) sess->RTSP_SignalData = SignalData;

	//realloc or alloc
	if (sess->rtsp_pck_buf && sess->rtsp_pck_size != RTSP_PCK_SIZE) {
		sess->rtsp_pck_size = RTSP_PCK_SIZE;
		sess->rtsp_pck_buf = (char *)realloc(sess->rtsp_pck_buf, sizeof(char)*sess->rtsp_pck_size);
	} else if (!sess->rtsp_pck_buf) {
		sess->rtsp_pck_size = RTSP_PCK_SIZE;
		sess->rtsp_pck_buf = (char *)realloc(sess->rtsp_pck_buf, sizeof(char)*sess->rtsp_pck_size);
		sess->pck_start = 0;
	}
	gf_mx_v(sess->mx);
	return GF_OK;
}

GF_EXPORT
GF_Err gf_rtsp_set_buffer_size(GF_RTSPSession *sess, u32 BufferSize)
{
	if (!sess) return GF_BAD_PARAM;
	sess->SockBufferSize = BufferSize;
	return GF_OK;
}


static Bool HTTP_RandInit = 1;

#define HTTP_WAIT_SEC		30

#define HTTP_RSP_OK	"HTTP/1.0 200 OK"


void RTSP_GenerateHTTPCookie(GF_RTSPSession *sess)
{
	u32 i, num, temp;

	if (HTTP_RandInit) {
		gf_rand_init(0);
		HTTP_RandInit = 0;
	}
	if (!sess->CookieRadLen) {
		strcpy(sess->HTTP_Cookie, "MPEG4M4");
		sess->CookieRadLen = 8;
	}
	num = gf_rand();
	for (i=0; i < 8; i++) {
		temp = (num >> (i * 4)) & 0x0f;
		sess->HTTP_Cookie[sess->CookieRadLen + i] = (u8) temp + sess->HTTP_Cookie[0];
	}
	sess->HTTP_Cookie[sess->CookieRadLen + i] = 0;	
}




//http tunnelling start.
GF_Err gf_rtsp_http_tunnel_start(GF_RTSPSession *sess, char *UserAgent)
{
	GF_Err e;
	u32 size;
	s32 pos;
	char buffer[GF_RTSP_DEFAULT_BUFFER];

	RTSP_GenerateHTTPCookie(sess);

	//  1. send "GET /sample.mov HTTP/1.0\r\n ..."
	memset(buffer, 0, GF_RTSP_DEFAULT_BUFFER);
	pos = 0;
	pos += sprintf(buffer + pos, "GET /%s HTTP/1.0\r\n", sess->Service);
	pos += sprintf(buffer + pos, "User-Agent: %s\r\n", UserAgent);
	pos += sprintf(buffer + pos, "x-sessioncookie: %s\r\n", sess->HTTP_Cookie);
	pos += sprintf(buffer + pos, "Accept: application/x-rtsp-tunnelled\r\n" );
	pos += sprintf(buffer + pos, "Pragma: no-cache\r\n" );
	pos += sprintf(buffer + pos, "Cache-Control: no-cache\r\n\r\n" );	
	
	//	send it!
	e = gf_sk_send_wait(sess->connection, buffer, strlen(buffer), HTTP_WAIT_SEC);
	if (e) return e;
	
	//	2. wait for "HTTP/1.0 200 OK"
	e = gf_sk_receive_wait(sess->connection, buffer, GF_RTSP_DEFAULT_BUFFER, 0, &size, HTTP_WAIT_SEC);
	if (e) return e;
	
	//get HTTP/1.0 200 OK
	if (strncmp(buffer, HTTP_RSP_OK, strlen(HTTP_RSP_OK))) return GF_REMOTE_SERVICE_ERROR;


	//	3. send "POST /sample.mov HTTP/1.0\r\n ..."
	sess->http = gf_sk_new(GF_SOCK_TYPE_TCP);
	if (!sess->http ) return GF_IP_NETWORK_FAILURE;
	if (gf_sk_connect(sess->http, sess->Server, sess->Port)) return GF_IP_CONNECTION_FAILURE; 

	memset(buffer, 0, GF_RTSP_DEFAULT_BUFFER);
	pos = 0;
	pos += sprintf(buffer + pos, "POST /%s HTTP/1.0\r\n", sess->Service);
	pos += sprintf(buffer + pos, "User-Agent: %s\r\n", UserAgent);
	pos += sprintf(buffer + pos, "x-sessioncookie: %s\r\n", sess->HTTP_Cookie);
	pos += sprintf(buffer + pos, "Accept: application/x-rtsp-tunnelled\r\n");
	pos += sprintf(buffer + pos, "Pragma: no-cache\r\n");
	pos += sprintf(buffer + pos, "Cache-Control: no-cache\r\n");	
	pos += sprintf(buffer + pos, "Content-Length: 32767\r\n");
	pos += sprintf(buffer + pos, "Expires: Sun. 9 Jan 1972 00:00:00 GMT\r\n\r\n");
 
	//	send it!
	e = gf_sk_send_wait(sess->http, buffer, strlen(buffer), HTTP_WAIT_SEC);
	
	return e;
}


/*server-side RTSP sockets*/

static u32 SessionID_RandInit = 0;


GF_EXPORT
GF_RTSPSession *gf_rtsp_session_new_server(GF_Socket *rtsp_listener)
{
	GF_RTSPSession *sess;
	GF_Socket *new_conn;
	GF_Err e;
	u32 fam;
	u16 port;
	char name[GF_MAX_IP_NAME_LEN];

	if (!rtsp_listener) return NULL;
	
	
	e = gf_sk_accept(rtsp_listener, &new_conn);
	if (!new_conn || e) return NULL;

	e = gf_sk_get_local_info(new_conn, &port, &fam);
	if (e) {
		gf_sk_del(new_conn);
		return NULL;
	}
	e = gf_sk_set_block_mode(new_conn, 1);
	if (e) {
		gf_sk_del(new_conn);
		return NULL;
	}
	e = gf_sk_server_mode(new_conn, 1);
	if (e) {
		gf_sk_del(new_conn);
		return NULL;
	}
	
	//OK create a new session
	GF_SAFEALLOC(sess, GF_RTSPSession);

	sess->connection = new_conn;
	sess->Port = port;
	sess->ConnectionType = fam;
	gf_sk_get_host_name(name);
	sess->Server = strdup(name);
	
	sess->TCPChannels = gf_list_new();
	return sess;
}


GF_EXPORT
GF_Err gf_rtsp_load_service_name(GF_RTSPSession *sess, char *URL)
{
	char server[1024], service[1024];
	GF_Err e;
	u16 Port;
	Bool UseTCP;
	u32 type;

	if (!sess || !URL) return GF_BAD_PARAM;
	e = RTSP_UnpackURL(URL, server, &Port, service, &UseTCP);
	if (e) return e;

	type = UseTCP ? GF_SOCK_TYPE_TCP : GF_SOCK_TYPE_UDP;
	//check the network type matches, otherwise deny client
	if (sess->ConnectionType != type) return GF_URL_ERROR;
	if (sess->Port != Port) return GF_URL_ERROR;

	//ok
	sess->Server = strdup(server);
	sess->Service = strdup(service);
	return GF_OK;
}


GF_EXPORT
char *gf_rtsp_generate_session_id(GF_RTSPSession *sess)
{
	u32 one, two;
	u64 res;
	char buffer[30];

	if (!sess) return NULL;

	if (!SessionID_RandInit) {
		SessionID_RandInit = 1;
		gf_rand_init(0);
	}
	one = gf_rand();
	//try to be as random as possible. if we had some global stats that'd be better
	two = (u32) sess + sess->CurrentPos + sess->CurrentSize;
	res = one;
	res <<= 32;
	res += two;
	sprintf(buffer, "%llu", res);
	return strdup(buffer);
}


GF_EXPORT
GF_Err gf_rtsp_get_session_ip(GF_RTSPSession *sess, char *buffer)
{
	if (!sess || !sess->connection) return GF_BAD_PARAM;
	gf_sk_get_local_ip(sess->connection, buffer);
	return GF_OK;
}


GF_EXPORT
u8 gf_rtsp_get_next_interleave_id(GF_RTSPSession *sess)
{
	u32 i;
	u8 id;
	GF_TCPChan *ch;
	id = 0;
	i=0;
	while ((ch = (GF_TCPChan *)gf_list_enum(sess->TCPChannels, &i))) {
		if (ch->rtpID >= id) id = ch->rtpID + 1;
		if (ch->rtcpID >= id) id = ch->rtcpID + 1;
	}
	return id;
}


GF_EXPORT
GF_Err gf_rtsp_get_remote_address(GF_RTSPSession *sess, char *buf)
{
	if (!sess || !sess->connection) return GF_BAD_PARAM;
	return gf_sk_get_remote_address(sess->connection, buf);
}