/*
* Copyright (C) 2012-2013 Doubango Telecom <http://www.doubango.org>
* Copyright (C) 2012 Diop Mamadou Ibrahima
*	
* This file is part of Open Source Doubango Framework.
*
* DOUBANGO 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 3 of the License, or
* (at your option) any later version.
*	
* DOUBANGO 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 DOUBANGO.
*
*/

/**@file tdav_session_av.c
 * @brief Audio/Video/T.140 base Session plugin
 */
// http://c-faq.com/ansi/constmismatch.html: to be checked for warnings

#include "tinydav/tdav_session_av.h"
#include "tinydav/codecs/dtmf/tdav_codec_dtmf.h"
#include "tinydav/codecs/fec/tdav_codec_red.h"
#include "tinydav/codecs/fec/tdav_codec_ulpfec.h"

#include "tinysdp/headers/tsdp_header_S.h"

#include "tinyrtp/trtp_manager.h"
#include "tinyrtp/rtp/trtp_rtp_packet.h"

#include "ice/tnet_ice_ctx.h"
#include "ice/tnet_ice_candidate.h"

#include "tinymedia/tmedia_consumer.h"
#include "tinymedia/tmedia_producer.h"
#include "tinymedia/tmedia_defaults.h"

#include "tls/tnet_tls.h"
#include "tls/tnet_dtls.h"

#include <math.h> /* log10 */


#if HAVE_SRTP
static const tsk_bool_t __have_libsrtp = tsk_true;
#else
static const tsk_bool_t __have_libsrtp = tsk_false;
#endif

#define TDAV_IS_DTMF_CODEC(codec) (TMEDIA_CODEC((codec))->plugin == tdav_codec_dtmf_plugin_def_t)
#define TDAV_IS_ULPFEC_CODEC(codec) (TMEDIA_CODEC((codec))->plugin == tdav_codec_ulpfec_plugin_def_t)
#define TDAV_IS_RED_CODEC(codec) (TMEDIA_CODEC((codec))->plugin == tdav_codec_red_plugin_def_t)

#if !defined(TDAV_DFAULT_FP_HASH)
#define TDAV_DFAULT_FP_HASH		tnet_dtls_hash_type_sha256
#endif /* TDAV_DFAULT_FP_HASH */
#if !defined(TDAV_FIXME_MEDIA_LEVEL_DTLS_ATT)
#define TDAV_FIXME_MEDIA_LEVEL_DTLS_ATT		0
#endif /* TDAV_FIXME_MEDIA_LEVEL_DTLS_ATT */

static void* TSK_STDCALL _tdav_session_av_error_async_thread(void* usrdata);
static int _tdav_session_av_raise_error_async(struct tdav_session_av_s* self, tsk_bool_t is_fatal, const char* reason);
#if HAVE_SRTP
static int _tdav_session_av_srtp_dtls_cb(const void* usrdata, enum trtp_srtp_dtls_event_type_e type, const char* reason);
#endif /* HAVE_SRTP */
static int _tdav_session_av_red_cb(const void* usrdata, const struct trtp_rtp_packet_s* packet);
static int _tdav_session_av_dtls_set_remote_setup(struct tdav_session_av_s* self, tnet_dtls_setup_t setup, tsk_bool_t connection_new);

#define SDP_CAPS_COUNT_MAX		0x1F
#define SDP_DECLARE_TAG int32_t tag // [1 - *]
#define SDP_TAG(self) ((self) ? *((int32_t*)(self)) : 0)

typedef enum RTP_PROFILE_E
{
	RTP_PROFILE_NONE = 0x00,

	RTP_PROFILE_AVP = (1 << 0),
	RTP_PROFILE_AVPF = (1 << 1),

	RTP_PROFILE_SECURE = (1 << 2),
	RTP_PROFILE_SECURE_SDES = (RTP_PROFILE_SECURE | (1 << 3)),
	RTP_PROFILE_SECURE_DTLS = (RTP_PROFILE_SECURE | (1 << 4)),

	RTP_PROFILE_SAVP = (RTP_PROFILE_AVP | RTP_PROFILE_SECURE_SDES),
	RTP_PROFILE_SAVPF = (RTP_PROFILE_AVPF | RTP_PROFILE_SECURE_SDES),

	RTP_PROFILE_UDP_TLS_RTP_SAVP = (RTP_PROFILE_AVP | RTP_PROFILE_SECURE_DTLS),
	RTP_PROFILE_UDP_TLS_RTP_SAVPF = (RTP_PROFILE_AVPF | RTP_PROFILE_SECURE_DTLS)
}
RTP_PROFILE_T;

typedef struct RTP_PROFILE_XS
{
	enum RTP_PROFILE_E type;
	const char* name;
}
RTP_PROFILE_XT;

static const RTP_PROFILE_XT RTP_PROFILES[] =
{
	{ RTP_PROFILE_AVP, "RTP/AVP" },
	{ RTP_PROFILE_AVPF, "RTP/AVPF" },
	{ RTP_PROFILE_SAVP, "RTP/SAVP" },
	{ RTP_PROFILE_SAVPF, "RTP/SAVPF" },
	{ RTP_PROFILE_UDP_TLS_RTP_SAVP, "UDP/TLS/RTP/SAVP" },
	{ RTP_PROFILE_UDP_TLS_RTP_SAVPF, "UDP/TLS/RTP/SAVPF" },
};
#define RTP_PROFILES_COUNT (sizeof(RTP_PROFILES) / sizeof(RTP_PROFILES[0]))

typedef struct sdp_acap_xs
{
	SDP_DECLARE_TAG;
	unsigned optional:1; // "e.g. [2]"
	unsigned or:1; // "e.g.|2"
	const char* value;
}
sdp_acap_xt;
typedef sdp_acap_xt sdp_acaps_xt[SDP_CAPS_COUNT_MAX];

typedef struct sdp_tcap_xs
{
	SDP_DECLARE_TAG;
	RTP_PROFILE_T profile;
}
sdp_tcap_xt;
typedef sdp_tcap_xt sdp_tcaps_xt[SDP_CAPS_COUNT_MAX];

typedef struct sdp_pcfg_xs
{
	SDP_DECLARE_TAG;
	sdp_tcap_xt tcap;
	sdp_acaps_xt acaps;
}
sdp_pcfg_xt;
typedef sdp_pcfg_xt sdp_acfg_xt;
typedef sdp_pcfg_xt sdp_pcfgs_xt[SDP_CAPS_COUNT_MAX];
typedef tsk_object_t sdp_headerM_Or_Message; /* tsdp_header_M_t or tsdp_message_t */

#define _sdp_reset(self) if((self)) memset((self), 0, sizeof(*(self)));
#define _sdp_pcfgs_reset(self) _sdp_reset((self))
#define _sdp_acfgs_reset(self) _sdp_reset((self))
#define _sdp_pcfg_reset(self) _sdp_reset((self))
#define _sdp_acfg_reset(self) _sdp_reset((self))
#define _sdp_tcaps_reset(self) _sdp_reset((self))
#define _sdp_acaps_reset(self) _sdp_reset((self))
#define _sdp_integer_length(self) ((self) ? ((int32_t)log10(abs(self)) + 1) : 1)
#define _sdp_str_index_of(str, sub_str) tsk_strindexOf((str), tsk_strlen((str)), sub_str)
#define _sdp_str_starts_with(str, sub_str) (_sdp_str_index_of((str), (sub_str)) == 0)
#define _sdp_str_contains(str, sub_str) (_sdp_str_index_of((str), (sub_str)) != -1)
#define _SDP_DECLARE_INDEX_OF(name) \
	static int32_t _sdp_##name##s_indexof(const sdp_##name##_xt (*name##s)[SDP_CAPS_COUNT_MAX], int32_t tag) \
	{ \
		if(name##s){ \
			int32_t i; \
			for(i = 0; i < SDP_CAPS_COUNT_MAX; ++i){ \
				if((*name##s)[i].tag == tag){ \
					return i; \
				} \
			} \
		} \
		return -1; \
	}

typedef struct tdav_sdp_caps_s
{
	TSK_DECLARE_OBJECT;

	sdp_pcfgs_xt local;
	sdp_pcfgs_xt remote;
	sdp_acfg_xt acfg;
}
tdav_sdp_caps_t;

static tdav_sdp_caps_t* tdav_sdp_caps_create();

static const tsdp_header_A_t* _sdp_findA_at(const sdp_headerM_Or_Message* sdp, const char* field, tsk_size_t index);
static int _sdp_add_headerA(sdp_headerM_Or_Message* sdp, const char* field, const char* value);
static RTP_PROFILE_T _sdp_profile_from_string(const char* profile);
static const char* _sdp_profile_to_string(RTP_PROFILE_T profile);
static int32_t _sdp_acaps_indexof(const sdp_acap_xt (*acaps)[SDP_CAPS_COUNT_MAX], int32_t tag);
static const sdp_acap_xt* _sdp_acaps_find_by_field(const sdp_acap_xt (*acaps)[SDP_CAPS_COUNT_MAX], const char* field, int32_t index);
static int _sdp_acaps_from_sdp(const sdp_headerM_Or_Message* sdp, sdp_acap_xt (*acaps)[SDP_CAPS_COUNT_MAX], tsk_bool_t reset);
static int32_t _sdp_tcaps_indexof(const sdp_tcap_xt (*tcaps)[SDP_CAPS_COUNT_MAX], int32_t tag);
static int _sdp_tcaps_from_sdp(const sdp_headerM_Or_Message* sdp, sdp_tcap_xt (*tcaps)[SDP_CAPS_COUNT_MAX], tsk_bool_t reset);
static int _sdp_acfg_to_sdp(sdp_headerM_Or_Message* sdp, const sdp_acfg_xt *acfg);
static int _sdp_pcfgs_from_sdp(const sdp_headerM_Or_Message* sdp, sdp_acap_xt (*acaps)[SDP_CAPS_COUNT_MAX], sdp_tcap_xt (*tcaps)[SDP_CAPS_COUNT_MAX], sdp_pcfg_xt (*pcfgs)[SDP_CAPS_COUNT_MAX], tsk_bool_t reset);
static int _sdp_pcfgs_to_sdp(sdp_headerM_Or_Message* sdp, const sdp_pcfg_xt (*pcfg)[SDP_CAPS_COUNT_MAX]);
static int _sdp_pcfg_ensure(sdp_headerM_Or_Message* sdp, const sdp_pcfg_xt* pcfg);
static int _sdp_pcfgs_cat(const sdp_pcfg_xt (*pcfgs_src)[SDP_CAPS_COUNT_MAX], sdp_pcfg_xt (*pcfgs_dst)[SDP_CAPS_COUNT_MAX]);


int tdav_session_av_init(tdav_session_av_t* self, tmedia_type_t media_type)
{
	uint64_t session_id;
	tmedia_profile_t profile = tmedia_defaults_get_profile(); // default profile, will be updated by the SIP session

	if(!self){
		TSK_DEBUG_ERROR("Invalid parameter");
		return -1;
	}

	/* base::init(): called by tmedia_session_create() */

	self->media_type = media_type;
	self->use_rtcp = tmedia_defaults_get_rtcp_enabled();
	self->use_rtcpmux = tmedia_defaults_get_rtcpmux_enabled();
	self->use_avpf = (profile == tmedia_profile_rtcweb); // negotiate if not RTCWeb profile or RFC5939 is in action
#if HAVE_SRTP
		// this is the default value and can be updated by the user using "session_set('srtp-mode', mode_e)"
		self->srtp_type = (profile == tmedia_profile_rtcweb) ? tmedia_srtp_type_sdes : tmedia_defaults_get_srtp_type();
		self->srtp_mode = (profile == tmedia_profile_rtcweb) ? tmedia_srtp_mode_mandatory : tmedia_defaults_get_srtp_mode();
		self->use_srtp = (self->srtp_mode == tmedia_srtp_mode_mandatory); // if optional -> negotiate
		// remove DTLS-SRTP option if not supported
		if((self->srtp_type & tmedia_srtp_type_dtls) && !tnet_dtls_is_srtp_supported()){
			TSK_DEBUG_ERROR("DTLS-SRTP enabled but not supported. Please rebuild the code with this option enabled (requires OpenSSL 1.0.1+)");
			if(!(self->srtp_type &= ~tmedia_srtp_type_dtls)){
				// only DTLS-SRTP was enabled
				self->srtp_mode = tmedia_srtp_mode_none;
				self->use_srtp = tsk_false;
			}
		}
		//!\ DTLS-SRTP requires certificates but do not check right now as it could be defined later
#endif
	
	tsk_safeobj_init(self);
	
	// session id
	if(!(session_id = TMEDIA_SESSION(self)->id)){ // set the session id if not already done
		TMEDIA_SESSION(self)->id = session_id = tmedia_session_get_unique_id();
	}
	// consumer
	TSK_OBJECT_SAFE_FREE(self->consumer);
	if(!(self->consumer = tmedia_consumer_create(self->media_type, session_id))){
		TSK_DEBUG_ERROR("Failed to create consumer for media type = %d", self->media_type);
	}
	// producer
	TSK_OBJECT_SAFE_FREE(self->producer);
	if(!(self->producer = tmedia_producer_create(self->media_type, session_id))){
		TSK_DEBUG_ERROR("Failed to create producer for media type = %d", self->media_type);
	}

	// sdp caps
	TSK_OBJECT_SAFE_FREE(self->sdp_caps);
	if(!(self->sdp_caps = tdav_sdp_caps_create())){
		TSK_DEBUG_ERROR("Failed to create SDP caps");
		return -1;
	}

	// pt mapping (when bypassing is enabled)
	self->pt_map.local = self->pt_map.remote = self->pt_map.neg = -1;
	
	return 0;
}

tsk_bool_t tdav_session_av_set(tdav_session_av_t* self, const tmedia_param_t* param)
{
	if(!self){
		TSK_DEBUG_ERROR("Invalid parameter");
		return tsk_false;
	}

	// try with base class first
	if(tmedia_session_set_2(TMEDIA_SESSION(self), param)){
		return tsk_true;
	}

	if(param->plugin_type == tmedia_ppt_consumer && self->consumer){
		return (tmedia_consumer_set(self->consumer, param) == 0);
	}
	else if(param->plugin_type == tmedia_ppt_producer && self->producer){
		return (tmedia_producer_set(self->producer, param) == 0);
	}
	else if(param->plugin_type == tmedia_ppt_session){
		if(param->value_type == tmedia_pvt_pchar){
			if(tsk_striequals(param->key, "remote-ip")){
				if(param->value){
					tsk_strupdate(&self->remote_ip, (const char*)param->value);
					return tsk_true;
				}
			}
			else if(tsk_striequals(param->key, "local-ip")){
				tsk_strupdate(&self->local_ip, (const char*)param->value);
				return tsk_true;
			}
			else if(tsk_striequals(param->key, "local-ipver")){
				self->use_ipv6 = tsk_striequals(param->value, "ipv6");
				return tsk_true;
			}
		}
		else if(param->value_type == tmedia_pvt_int32){
			if(tsk_striequals(param->key, "srtp-mode")){
#if HAVE_SRTP
				self->srtp_mode = (tmedia_srtp_mode_t)TSK_TO_INT32((uint8_t*)param->value);
				if(self->rtp_manager){
					trtp_manager_set_srtp_type_local(self->rtp_manager, self->srtp_type, self->srtp_mode);
				}
#else
				TSK_DEBUG_INFO("'srtp-mode' param ignored beacuse SRTP not enabled. Please rebuild the source code with this option.");
#endif /* HAVE_SRTP */
				return tsk_true;
			}
			else if(tsk_striequals(param->key, "rtp-ssrc")){
				self->rtp_ssrc = *((uint32_t*)param->value);
				if(self->rtp_manager && self->rtp_ssrc){
					self->rtp_manager->rtp.ssrc.local = self->rtp_ssrc;
				}
				return tsk_true;
			}
			else if(tsk_striequals(param->key, "rtcp-enabled")){
				self->use_rtcp = (TSK_TO_INT32((uint8_t*)param->value) != 0);
				return tsk_true;
			}
			else if(tsk_striequals(param->key, "rtcpmux-enabled")){
				self->use_rtcpmux = (TSK_TO_INT32((uint8_t*)param->value) != 0);
				return tsk_true;
			}
			else if(tsk_striequals(param->key, "avpf-enabled")){
				self->use_avpf = (TSK_TO_INT32((uint8_t*)param->value) != 0);
				return tsk_true;
			}
			else if(tsk_striequals(param->key, "webrtc2sip-mode-enabled")){
				self->is_webrtc2sip_mode_enabled = (TSK_TO_INT32((uint8_t*)param->value) != 0);
				return tsk_true;
			}
		}
		else if(param->value_type == tmedia_pvt_pobject){
			if(tsk_striequals(param->key, "natt-ctx")){
				TSK_OBJECT_SAFE_FREE(self->natt_ctx);
				self->natt_ctx = tsk_object_ref(param->value);
				return tsk_true;
			}
			else if(tsk_striequals(param->key, "ice-ctx")){
				TSK_OBJECT_SAFE_FREE(self->ice_ctx);
				self->ice_ctx = tsk_object_ref(param->value);
				if(self->rtp_manager){
					trtp_manager_set_ice_ctx(self->rtp_manager, self->ice_ctx);
				}
				return tsk_true;
			}
			else if(tsk_striequals(param->key, "remote-sdp-message")){
				TSK_OBJECT_SAFE_FREE(self->remote_sdp);
				self->remote_sdp = (struct tsdp_message_s*)tsk_object_ref(param->value);
				return tsk_true;
			}
			else if(tsk_striequals(param->key, "local-sdp-message")){
				TSK_OBJECT_SAFE_FREE(self->local_sdp);
				self->local_sdp = (struct tsdp_message_s*)tsk_object_ref(param->value);
				return tsk_true;
			}
		}
	}

	return tsk_false;
}

tsk_bool_t tdav_session_av_get(tdav_session_av_t* self, tmedia_param_t* param)
{
	if(!self || !param){
		TSK_DEBUG_ERROR("Invalid parameter");
		return tsk_false;
	}

	// try with the base class to see if this option is supported or not
	if(tmedia_session_get(TMEDIA_SESSION(self), param)){
		return tsk_true;
	}

	if(param->plugin_type == tmedia_ppt_session){
		if(param->value_type == tmedia_pvt_int32){
			if(tsk_striequals(param->key, "srtp-enabled")){
#if HAVE_SRTP
				if(self->rtp_manager){
					((int8_t*)param->value)[0] = self->use_srtp ? 1 : 0;
					return tsk_true;
				}
#else
				((int8_t*)param->value)[0] = 0;
				TSK_DEBUG_INFO("Ignoring parameter 'srtp-enabled' because SRTP not supported. Please rebuild the source code with this option enabled.");
				return tsk_true;
#endif /* HAVE_SRTP */
			}
		}
	}

	return tsk_false;
}

int tdav_session_av_prepare(tdav_session_av_t* self)
{
	int ret = 0;

	if(!self){
		TSK_DEBUG_ERROR("Invalid parameter");
		return -1;
	}	

	/* set local port */
	if(!self->rtp_manager){
		self->rtp_manager = self->ice_ctx ? trtp_manager_create_2(self->ice_ctx, self->srtp_type, self->srtp_mode)
			: trtp_manager_create(self->use_rtcp, self->local_ip, self->use_ipv6, self->srtp_type, self->srtp_mode);
		if(self->rtp_manager){
			/* MAXM-515: it will set different QoS values depending on the type of media */
			(self->media_type == tmedia_audio) ? trtp_set_audio_rtp_dscp(self->rtp_manager) :
				((tmedia_video == self->media_type)?trtp_set_video_rtp_dscp(self->rtp_manager) :
				  trtp_set_audio_rtp_dscp(self->rtp_manager));
			/*MAXM-515 END */

			if((ret = trtp_manager_set_port_range(self->rtp_manager, tmedia_defaults_get_rtp_port_range_start(), tmedia_defaults_get_rtp_port_range_stop()))){
				return ret;
			}
#if HAVE_SRTP
			if(tsk_strnullORempty(TMEDIA_SESSION(self)->dtls.file_pbk)){
				// DTLS-SRTP requires certificates
				if(self->srtp_type & tmedia_srtp_type_dtls){
					TSK_DEBUG_WARN("DTLS-SRTP requested but not certificate provided, disabling this option :(");
					if(!(self->srtp_type &= ~tmedia_srtp_type_dtls)){
						// only DTLS-SRTP was enabled
						self->srtp_mode = tmedia_srtp_mode_none;
						self->use_srtp = tsk_false;
						// update rtpmanager
						ret = trtp_manager_set_srtp_type_local(self->rtp_manager, self->srtp_type, self->srtp_mode);
					}
				}
			}
			if((self->srtp_type & tmedia_srtp_type_dtls) && (self->srtp_mode == tmedia_srtp_mode_optional || self->srtp_mode == tmedia_srtp_mode_mandatory)){
				if((ret = trtp_manager_set_dtls_certs(self->rtp_manager, TMEDIA_SESSION(self)->dtls.file_ca, TMEDIA_SESSION(self)->dtls.file_pbk, TMEDIA_SESSION(self)->dtls.file_pvk, TMEDIA_SESSION(self)->dtls.verify))){
					return ret;
				}
			}
#endif /* HAVE_SRTP */
			if((ret = trtp_manager_prepare(self->rtp_manager))){
				return ret;
			}
			if(self->natt_ctx){
				if((ret = trtp_manager_set_natt_ctx(self->rtp_manager, self->natt_ctx))){
					return ret;
				}
			}
			if(self->rtp_ssrc){
				self->rtp_manager->rtp.ssrc.local = self->rtp_ssrc;
			}
		}
	}

	/* SRTP */
#if HAVE_SRTP
	{
		
	}
#endif

	/* Consumer will be prepared in tdav_session_audio_start() */
	/* Producer will be prepared in tdav_session_audio_start() */

	return ret;
}

int tdav_session_av_start(tdav_session_av_t* self, const tmedia_codec_t* best_codec)
{
	int ret;
	if(!self || !best_codec){
		TSK_DEBUG_ERROR("Invalid parameter");
		return -1;
	}

	// RED codec
	TSK_OBJECT_SAFE_FREE(self->red.codec);
	self->red.payload_type = 0;
	if((self->red.codec = tsk_object_ref((tsk_object_t*)tdav_session_av_get_red_codec(self)))){
		self->red.payload_type = atoi(self->red.codec->neg_format);
		if(!TMEDIA_CODEC(self->red.codec)->opened){
			if((ret = tmedia_codec_open(self->red.codec))){
				TSK_DEBUG_ERROR("Failed to open [%s] codec", self->red.codec->plugin->desc);
				return ret;
			}
		}
		// set RED callback (unencapsulated data)
		ret = tdav_codec_red_set_callback((struct tdav_codec_red_s*)self->red.codec, _tdav_session_av_red_cb, self);
	}

	// ULPFEC
	TSK_OBJECT_SAFE_FREE(self->ulpfec.codec);
	self->ulpfec.payload_type = 0;
	if((self->ulpfec.codec = tsk_object_ref((tsk_object_t*)tdav_session_av_get_ulpfec_codec(self)))){
		self->ulpfec.payload_type = atoi(self->ulpfec.codec->neg_format);
		if(!TMEDIA_CODEC(self->ulpfec.codec)->opened){
			if((ret = tmedia_codec_open(self->ulpfec.codec))){
				TSK_DEBUG_ERROR("Failed to open [%s] codec", self->ulpfec.codec->plugin->desc);
				return ret;
			}
		}
	}

	if(self->rtp_manager){
		int ret;
		/* RTP/RTCP manager: use latest information. */

		// set callbacks
#if HAVE_SRTP
		ret = trtp_manager_set_dtls_callback(self->rtp_manager, self, _tdav_session_av_srtp_dtls_cb);
#endif /* HAVE_SRTP */

		// these information will be updated when the RTP manager starts if ICE is enabled
		ret = trtp_manager_set_rtp_remote(self->rtp_manager, self->remote_ip, self->remote_port);
		ret = trtp_manager_set_payload_type(self->rtp_manager, best_codec->neg_format ? atoi(best_codec->neg_format) : atoi(best_codec->format));
		self->rtp_manager->use_rtcpmux = self->use_rtcpmux;
		ret = trtp_manager_start(self->rtp_manager);

		// because of AudioUnit under iOS => prepare both consumer and producer then start() at the same time
		/* prepare consumer and producer */
		if(self->producer) ret = tmedia_producer_prepare(self->producer, best_codec);
		if(self->consumer) ret = tmedia_consumer_prepare(self->consumer, best_codec);
		
#if HAVE_SRTP
		self->use_srtp = trtp_manager_is_srtp_activated(self->rtp_manager);

		/* start consumer and producer */
		if(trtp_manager_is_dtls_activated(self->rtp_manager) && !trtp_manager_is_dtls_started(self->rtp_manager)){
			// delay starting util DTLS-SRTP negotiation terminates (handshaking succeed)
			TSK_DEBUG_INFO("Delaying consumer/producer starting until DTLS-SRTP negotiation complete");
		}
		else{
#endif /* HAVE_SRTP */
			if(self->consumer) ret = tmedia_consumer_start(self->consumer);
			if(self->producer) ret = tmedia_producer_start(self->producer);
#if HAVE_SRTP
		}
#endif /* HAVE_SRTP */
				
		return ret;
	}
	else{
		TSK_DEBUG_ERROR("Invalid RTP/RTCP manager");
		return -3;
	}

	return 0;
}

int tdav_session_av_stop(tdav_session_av_t* self)
{
	tmedia_codec_t* codec;
	tsk_list_item_t* item;
	int ret = 0;

	if(!self){
		TSK_DEBUG_ERROR("Invalid parameter");
		return -1;
	}
	
	/* stop Producer */
	if(self->producer){
		ret = tmedia_producer_stop(self->producer);
	}

	/* stop RTP/RTCP manager */
	if(self->rtp_manager){
		ret = trtp_manager_stop(self->rtp_manager);
	}

	/* stop Consumer (after RTP manager to silently discard in coming packets) */
	if(self->consumer){
		ret = tmedia_consumer_stop(self->consumer);
	}

	/* close codecs to force open() for next start (e.g SIP UPDATE with SDP) */
	if(TMEDIA_SESSION(self)->neg_codecs){
		tsk_list_foreach(item, TMEDIA_SESSION(self)->neg_codecs){
			if(!(codec = TMEDIA_CODEC(item->data))){
				continue;
			}
			ret = tmedia_codec_close(codec);
		}
	}

	return ret;
}

int tdav_session_av_pause(tdav_session_av_t* self)
{
	int ret = 0;

	if(!self){
		TSK_DEBUG_ERROR("Invalid parameter");
		return -1;
	}

	/* Consumer */
	if(self->consumer){
		ret = tmedia_consumer_pause(self->consumer);
	}
	/* Producer */
	if(self->producer){
		ret = tmedia_producer_pause(self->producer);
	}

	return ret;
}

const tsdp_header_M_t* tdav_session_av_get_lo(tdav_session_av_t* self, tsk_bool_t *updated)
{
	tmedia_session_t* base = TMEDIA_SESSION(self);
#if HAVE_SRTP
	static const tsk_bool_t have_lib_srtp = tsk_true;        
#else
	static const tsk_bool_t have_lib_srtp = tsk_false;
#endif
	const tsk_bool_t have_lib_srtp_dtls = tnet_dtls_is_srtp_supported();
	tsk_bool_t is_srtp_enable = (self->srtp_type != tmedia_srtp_type_none) && (self->srtp_mode == tmedia_srtp_mode_optional || self->srtp_mode == tmedia_srtp_mode_mandatory);
	tsk_bool_t is_srtp_dtls_enabled = is_srtp_enable && !!(self->srtp_type & tmedia_srtp_type_dtls);
	tsk_bool_t is_srtp_sdes_enabled = is_srtp_enable && !!(self->srtp_type & tmedia_srtp_type_sdes);
	tsk_bool_t is_srtp_local_mandatory = is_srtp_enable && (self->srtp_mode == tmedia_srtp_mode_mandatory);
	tsk_bool_t is_first_media;

	if(!base || !base->plugin || !updated){
		TSK_DEBUG_ERROR("Invalid parameter");
		return tsk_null;
	}
	
	*updated = tsk_false;

	if(!self->rtp_manager || (!self->ice_ctx && !self->rtp_manager->transport)){
		if(self->rtp_manager && (!self->ice_ctx && !self->rtp_manager->transport)){ // reINVITE or UPDATE (manager was destroyed when stoppped)
			if(trtp_manager_prepare(self->rtp_manager)){
				TSK_DEBUG_ERROR("Failed to prepare transport");
				return tsk_null;
			}
		}
		else{
			TSK_DEBUG_ERROR("RTP/RTCP manager in invalid");
			return tsk_null;
		}
	}

	// only first media will add session-level attributes (e.g. DTLS setup and fingerprint)
	if((is_first_media = !!self->local_sdp)){
		const tsdp_header_M_t* firstM = (const tsdp_header_M_t*)tsdp_message_get_headerAt(self->local_sdp, tsdp_htype_M, 0);
		if(!(is_first_media = !firstM)){
			is_first_media = tsk_striequals(TMEDIA_SESSION(self)->plugin->media, firstM->media);
		}
	}
	
	if(base->ro_changed && base->M.lo){
		static const char* __fields[] = 
		{
			/* Codecs */
			"fmtp", "rtpmap", "imageattr",
			/* QoS */
			"curr", "des", "conf",
			/* SRTP */
			"crypto",
			/* DTLS */
			"setup", "fingerprint",
			/* ICE */
			"candidate", "ice-ufrag", "ice-pwd",
			/* SDPCapNeg */
			"tcap", "acap", "pcfg",
			/* Others */
			"mid", "rtcp-mux", "ssrc"
		};
		// remove media-level attributes
		tsdp_header_A_removeAll_by_fields(base->M.lo->Attributes, __fields, sizeof(__fields)/sizeof(__fields[0]));
		tsk_list_clear_items(base->M.lo->FMTs);
		// remove session-level attributes
		if(is_first_media){
			// headers: contains all kind of headers but this is a smart function :)
			tsdp_header_A_removeAll_by_fields((tsdp_headers_A_L_t*)self->local_sdp->headers, __fields, sizeof(__fields)/sizeof(__fields[0]));
		}
	}

	*updated = (base->ro_changed || !base->M.lo);

	if(!base->M.lo){
		if((base->M.lo = tsdp_header_M_create(base->plugin->media, self->rtp_manager->rtp.public_port, "RTP/AVP"))){
			/* If NATT is active, do not rely on the global IP address Connection line */
			if(self->natt_ctx){
				tsdp_header_M_add_headers(base->M.lo,
					TSDP_HEADER_C_VA_ARGS("IN", self->use_ipv6 ? "IP6" : "IP4", self->rtp_manager->rtp.public_ip),
					tsk_null);
			}
			/* 3GPP TS 24.229 - 6.1.1 General
			In order to support accurate bandwidth calculations, the UE may include the "a=ptime" attribute for all "audio" media
			lines as described in RFC 4566 [39]. If a UE receives an "audio" media line with "a=ptime" specified, the UE should
			transmit at the specified packetization rate. If a UE receives an "audio" media line which does not have "a=ptime"
			specified or the UE does not support the "a=ptime" attribute, the UE should transmit at the default codec packetization
			rate as defined in RFC 3551 [55A]. The UE will transmit consistent with the resources available from the network.

			For "video" and "audio" media types that utilize the RTP/RTCP, the UE shall specify the proposed bandwidth for each
			media stream utilizing the "b=" media descriptor and the "AS" bandwidth modifier in the SDP.

			The UE shall include the MIME subtype "telephone-event" in the "m=" media descriptor in the SDP for audio media
			flows that support both audio codec and DTMF payloads in RTP packets as described in RFC 4733 [23].
			*/

			if(self->media_type == tmedia_audio){
				/* MAX-1529
				 * Adding these API from doubango revision 898
				 */
				tsk_istr_t ptime;
				tsk_itoa(tmedia_defaults_get_audio_ptime(), &ptime);

				/* END */

				/* MAX-1530 -- START */
				char silenceSupp[20];
				memset(silenceSupp, 0, 20);
				strncpy(silenceSupp, (tmedia_defaults_get_vad_enabled()?"on - - - -":"off - - - -"),19);
				tsdp_header_M_add_headers(base->M.lo,
						/* rfc3551 section 4.5 says the default ptime is 20 */
						/* ptime values are patched from doubango revision 901 */
						TSDP_HEADER_A_VA_ARGS("ptime", ptime),
						TSDP_HEADER_A_VA_ARGS("minptime", "1"),
						TSDP_HEADER_A_VA_ARGS("maxptime", "255"),
						TSDP_HEADER_A_VA_ARGS("silenceSupp", silenceSupp),
						tsk_null);
				/* MAX-1530 -- END */
				// the "telephone-event" fmt/rtpmap is added below
			}
		}
		else{
			TSK_DEBUG_ERROR("Failed to create lo");
			return tsk_null;
		}
	}
	
	if(*updated){
		tmedia_codecs_L_t* neg_codecs = tsk_null;

		if(base->M.ro){
			TSK_OBJECT_SAFE_FREE(base->neg_codecs);
			/* update negociated codecs */
			if((neg_codecs = tmedia_session_match_codec(base, base->M.ro))){
				base->neg_codecs = neg_codecs;
			}
			/* from codecs to sdp */
			if(TSK_LIST_IS_EMPTY(base->neg_codecs) || ((base->neg_codecs->tail == base->neg_codecs->head) && TDAV_IS_DTMF_CODEC(TSK_LIST_FIRST_DATA(base->neg_codecs)))){
				base->M.lo->port = 0; /* Keep the RTP transport and reuse it when we receive a reINVITE or UPDATE request */
				TSK_DEBUG_INFO("No codec matching for media type = %d", (int32_t)self->media_type);
				goto DONE;
			}
			else{
				tmedia_codec_to_sdp(base->neg_codecs, base->M.lo);
			}
		}
		else{
			/* from codecs to sdp */
			tmedia_codec_to_sdp(base->codecs, base->M.lo);
		}

		/* SRTP */
#if HAVE_SRTP
		{ //start-of-HAVE_SRTP

			/* DTLS-SRTP default values */
			if(is_srtp_dtls_enabled){
				/* "setup" and "connection" */
				// rfc5763: the caller is server by default
				//if(self->dtls.local.setup == tnet_dtls_setup_none || self->dtls.local.setup == tnet_dtls_setup_actpass){
					self->dtls.remote.setup = (!base->M.ro) ? tnet_dtls_setup_active : tnet_dtls_setup_passive;
				//}
				_tdav_session_av_dtls_set_remote_setup(self, self->dtls.remote.setup, self->dtls.remote.connection_new);
				if(self->rtp_manager){
					trtp_manager_set_dtls_local_setup(self->rtp_manager, self->dtls.local.setup, self->dtls.local.connection_new);
				}
			}

			if(!base->M.ro){
				// === RO IS NULL ===
				const trtp_srtp_ctx_xt *srtp_ctxs[SRTP_CRYPTO_TYPES_MAX] = { tsk_null };
				tsk_size_t ctx_count = 0, ctx_idx, acap_tag = 1;
				tsk_size_t acap_tag_fp_sha1 = 0, acap_tag_fp_sha256 = 0, acap_tag_setup = 0, acap_tag_connection = 0, acap_tag_crypro_start = 0;
				char* str = tsk_null;
				tsdp_header_A_t* cryptoA = tsk_null;
				tsk_bool_t negotiate_srtp = (self->srtp_mode == tmedia_srtp_mode_optional && !base->M.ro);
				tsk_bool_t negotiate_avpf = self->use_avpf;		//MAXM-200 (removed "!" from "negotiate_avpf = !self->use_avpf;", as it was adding AVPF in sdp Always).
				tsk_bool_t is_srtp_remote_mandatory = (base->M.ro && _sdp_str_contains(base->M.ro->proto, "SAVP"));
				tsk_size_t profiles_index = 0;
				RTP_PROFILE_T profiles[RTP_PROFILES_COUNT] = { RTP_PROFILE_NONE };

				// get local SRTP context
				if(is_srtp_sdes_enabled){
					ctx_count = trtp_srtp_get_local_contexts(self->rtp_manager, (const trtp_srtp_ctx_xt **)&srtp_ctxs, sizeof(srtp_ctxs)/sizeof(srtp_ctxs[0]));
				}

				// a=tcap:
				if((negotiate_srtp || negotiate_avpf)){
					static const int32_t __tcap_tag = 1;
					char* tcap = tsk_null;
					const char* fp_sha1 = tsk_null;
					const char* fp_sha256 = tsk_null;
					#define _first_media_add_header()
					#define _first_media_strcat(ppstr, format, ...) if(is_first_media) tsk_strcat_2((ppstr), (format), ##__VA_ARGS__)
					#define _first_media_sprintf(ppstr, format, ...) if(is_first_media) tsk_sprintf((ppstr), (format), ##__VA_ARGS__)
					#define _first_media_add_headers(sdp, ...) if(is_first_media) tsdp_message_add_headers((sdp), ##__VA_ARGS__)
					
					_first_media_strcat(&tcap, "%d", __tcap_tag);

					if(is_srtp_dtls_enabled){
						if(!tsk_strnullORempty(TMEDIA_SESSION(self)->dtls.file_pbk)){
							fp_sha1 = trtp_manager_get_dtls_local_fingerprint(self->rtp_manager, tnet_dtls_hash_type_sha1);
							fp_sha256 = trtp_manager_get_dtls_local_fingerprint(self->rtp_manager, tnet_dtls_hash_type_sha256);
						}
						_first_media_strcat(&tcap, negotiate_avpf ? " UDP/TLS/RTP/SAVPF UDP/TLS/RTP/SAVP" : "UDP/TLS/RTP/SAVP");
						if(negotiate_avpf){
							profiles[profiles_index++] = RTP_PROFILE_UDP_TLS_RTP_SAVPF;
						}
						profiles[profiles_index++] = RTP_PROFILE_UDP_TLS_RTP_SAVP;
					}
					if(is_srtp_sdes_enabled){
						_first_media_strcat(&tcap, negotiate_avpf ? " RTP/SAVPF RTP/SAVP" : "RTP/SAVP");
						if(negotiate_avpf){
							profiles[profiles_index++] = RTP_PROFILE_SAVPF;
						}
						profiles[profiles_index++] = RTP_PROFILE_SAVP;
					}
					
					if(!is_srtp_local_mandatory){
						_first_media_strcat(&tcap, " RTP/AVPF");
						profiles[profiles_index++] = RTP_PROFILE_AVPF;
					}
					
					// DTLS "setup" and "fringerprint"s
					if((fp_sha1 || fp_sha256) && negotiate_srtp){
						char* acap_fp = tsk_null;
						acap_tag_setup = 1, acap_tag_connection = 2;
						_first_media_sprintf(&str, "%d setup:%s", acap_tag_setup, TNET_DTLS_SETUP_NAMES[self->dtls.local.setup]);
						_first_media_add_headers(self->local_sdp, TSDP_HEADER_A_VA_ARGS("acap", str), tsk_null);
						_first_media_sprintf(&str, "%d connection:%s", acap_tag_connection, self->dtls.local.connection_new ? "new" : "existing");
						_first_media_add_headers(self->local_sdp, TSDP_HEADER_A_VA_ARGS("acap", str), tsk_null);
						// New Firefox Nightly repspond with SHA-256 when offered SHA-1 -> It's a bug in FF
						// Just use SHA-256 as first choice						
						if(fp_sha256){
							_first_media_sprintf(&acap_fp, "3 fingerprint:%s %s", TNET_DTLS_HASH_NAMES[tnet_dtls_hash_type_sha256], fp_sha256);
							acap_tag_fp_sha256 = 3;
							_first_media_add_headers(self->local_sdp, TSDP_HEADER_A_VA_ARGS("acap", acap_fp), tsk_null);
						}
						if(fp_sha1){
							_first_media_sprintf(&acap_fp, "%d fingerprint:%s %s", fp_sha256 ? 4 : 3, TNET_DTLS_HASH_NAMES[tnet_dtls_hash_type_sha1], fp_sha1);
							acap_tag_fp_sha1 = (fp_sha256 ? 4 : 3);
							_first_media_add_headers(self->local_sdp, TSDP_HEADER_A_VA_ARGS("acap", acap_fp), tsk_null);
						}

						TSK_FREE(acap_fp);
					}
					
					// "tcap"
					_first_media_add_headers(self->local_sdp, TSDP_HEADER_A_VA_ARGS("tcap", tcap), tsk_null);
					TSK_FREE(tcap);

					acap_tag = TSK_MAX(acap_tag, acap_tag_connection);
					acap_tag = TSK_MAX(acap_tag, acap_tag_fp_sha1);
					acap_tag = TSK_MAX(acap_tag, acap_tag_fp_sha256);
				}
				if(is_first_media && !negotiate_srtp && is_srtp_dtls_enabled){
					// add DTLS-SRTP fingerprint and setup at session-level
					const char* fp_str = trtp_manager_get_dtls_local_fingerprint(self->rtp_manager, TDAV_DFAULT_FP_HASH);
					if(fp_str){
						tsk_sprintf(&str, "%s %s", TNET_DTLS_HASH_NAMES[TDAV_DFAULT_FP_HASH], fp_str);
#if TDAV_FIXME_MEDIA_LEVEL_DTLS_ATT
						tsdp_header_M_add_headers(base->M.lo, TSDP_HEADER_A_VA_ARGS("fingerprint", str), tsk_null);
						tsdp_header_M_add_headers(base->M.lo, TSDP_HEADER_A_VA_ARGS("setup", "active"), tsk_null);
						tsdp_header_M_add_headers(base->M.lo, TSDP_HEADER_A_VA_ARGS("connection", "new"), tsk_null);
#else
						_first_media_add_headers(self->local_sdp, TSDP_HEADER_A_VA_ARGS("fingerprint", str), tsk_null);
						_first_media_add_headers(self->local_sdp, TSDP_HEADER_A_VA_ARGS("setup", TNET_DTLS_SETUP_NAMES[self->dtls.local.setup]), tsk_null);
						_first_media_add_headers(self->local_sdp, TSDP_HEADER_A_VA_ARGS("connection", self->dtls.local.connection_new ? "new" : "existing"), tsk_null);
#endif
					}
				}

				// "a=acap:crypto" or "a=crypto"
				for(ctx_idx = 0; ctx_idx < ctx_count; ++ctx_idx){
					if(acap_tag_crypro_start == 0){
						acap_tag_crypro_start = (acap_tag == 1 ? acap_tag : ++acap_tag);
					}
					if(negotiate_srtp){
						tsk_sprintf(&str, "%d crypto:%d %s inline:%s", acap_tag++, srtp_ctxs[ctx_idx]->rtp.tag, trtp_srtp_crypto_type_strings[srtp_ctxs[ctx_idx]->rtp.crypto_type], srtp_ctxs[ctx_idx]->rtp.key_str);
						cryptoA = tsdp_header_A_create("acap", str);
					}
					else{
						tsk_sprintf(&str, "%d %s inline:%s", srtp_ctxs[ctx_idx]->rtp.tag, trtp_srtp_crypto_type_strings[srtp_ctxs[ctx_idx]->rtp.crypto_type], srtp_ctxs[ctx_idx]->rtp.key_str);
						cryptoA = tsdp_header_A_create("crypto", str);
					}

					tsdp_header_M_add(base->M.lo, (const tsdp_header_t*)cryptoA);

					TSK_OBJECT_SAFE_FREE(cryptoA);
				}

				// a=pcfg:
				if(negotiate_srtp || negotiate_avpf){
					tsk_size_t pcfg_tag, pcfg_idx;
					char *acap_crypto = tsk_null, *acap_dtls = tsk_null;
					
					// crypto
					for(ctx_idx = 0; ctx_idx < ctx_count; ++ctx_idx){
						tsk_strcat_2(&acap_crypto, "%s%d", 
								acap_crypto ? "," : "",
								(acap_tag_crypro_start + ctx_idx)
							);
					}
					
					// dtls setup and fingerprints
					if(acap_tag_setup > 0 && acap_tag_connection > 0 && (acap_tag_fp_sha1 > 0 || acap_tag_fp_sha256 > 0)){
						tsk_sprintf(&acap_dtls, "%d,%d", acap_tag_setup, acap_tag_connection);
						if(acap_tag_fp_sha1 > 0){
							tsk_strcat_2(&acap_dtls, ",%d", acap_tag_fp_sha1);
						}
						if(acap_tag_fp_sha256 > 0){
							tsk_strcat_2(&acap_dtls, "%s%d", acap_tag_fp_sha1 > 0 ? "|" : ",", acap_tag_fp_sha256);
						}
					}

					for(pcfg_tag = 1, pcfg_idx = 0; pcfg_idx < profiles_index; ++pcfg_tag, ++pcfg_idx){
						if(((profiles[pcfg_idx] & RTP_PROFILE_SECURE_SDES) == RTP_PROFILE_SECURE_SDES) && acap_crypto){
							tsk_sprintf(&str, "%d t=%d a=%s", pcfg_tag, pcfg_tag, acap_crypto);
						}
						else if(((profiles[pcfg_idx] & RTP_PROFILE_SECURE_DTLS) == RTP_PROFILE_SECURE_DTLS) && acap_dtls){
							tsk_sprintf(&str, "%d t=%d a=%s", pcfg_tag, pcfg_tag, acap_dtls);
						}
						else{
							tsk_sprintf(&str, "%d t=%d", pcfg_tag, pcfg_tag);
						}
						tsdp_header_M_add_headers(base->M.lo, TSDP_HEADER_A_VA_ARGS("pcfg", str), tsk_null);
					}
					
					TSK_FREE(acap_crypto);
					TSK_FREE(acap_dtls);
				}
				
				if(is_srtp_remote_mandatory || is_srtp_local_mandatory || trtp_srtp_is_initialized(self->rtp_manager)){
					self->use_srtp = tsk_true;
				}

				/* RFC 5939 - Session Description Protocol (SDP) Capability Negotiation */
				{ 
					sdp_acaps_xt acaps;
					sdp_tcaps_xt tcaps;

					_sdp_acaps_reset(&acaps);
					_sdp_tcaps_reset(&tcaps);
					_sdp_pcfgs_reset(&self->sdp_caps->local);
					// session-level attributes
					if(self->local_sdp){
						_sdp_pcfgs_from_sdp(self->local_sdp, &acaps, &tcaps, &self->sdp_caps->local, tsk_false);
					}
					// media-level attributes
					_sdp_pcfgs_from_sdp(base->M.lo, &acaps, &tcaps, &self->sdp_caps->local, tsk_false);
				}

				TSK_FREE(str);
			} //end-of-if(!base->M.ro)
			else{
				// === RO IS NOT NULL ===
				// the ro validity has been checked in "set_ro()"
				RTP_PROFILE_T profile_remote = (self->sdp_caps->acfg.tag > 0 && self->sdp_caps->acfg.tcap.tag > 0)
					? self->sdp_caps->acfg.tcap.profile
					: _sdp_profile_from_string(base->M.ro->proto);
				tsk_bool_t is_srtp_sdes_activated = tsk_false, is_srtp_dtls_activated = tsk_false;

				// intersect remote and local SRTP options
				self->use_avpf |= ((profile_remote & RTP_PROFILE_AVPF) == RTP_PROFILE_AVPF);
				is_srtp_sdes_enabled &= ((profile_remote & RTP_PROFILE_SECURE_SDES) == RTP_PROFILE_SECURE_SDES);
				is_srtp_dtls_enabled &= ((profile_remote & RTP_PROFILE_SECURE_DTLS) == RTP_PROFILE_SECURE_DTLS);
				
				
				// SDES-SRTP
				if(is_srtp_sdes_enabled){
					const trtp_srtp_ctx_xt *srtp_ctxs[SRTP_CRYPTO_TYPES_MAX] = { tsk_null };
					tsk_size_t ctx_count = 0, ctx_idx;
					// get local SRTP context
					if((ctx_count = trtp_srtp_get_local_contexts(self->rtp_manager, (const trtp_srtp_ctx_xt **)&srtp_ctxs, sizeof(srtp_ctxs)/sizeof(srtp_ctxs[0]))) > 0){
						char* str = tsk_null;
						for(ctx_idx = 0; ctx_idx < ctx_count; ++ctx_idx){
							is_srtp_sdes_activated = tsk_true;
                            tsk_sprintf(&str, "%d %s inline:%s", srtp_ctxs[ctx_idx]->rtp.tag, trtp_srtp_crypto_type_strings[srtp_ctxs[ctx_idx]->rtp.crypto_type], srtp_ctxs[ctx_idx]->rtp.key_str);
                            tsdp_header_M_add_headers(base->M.lo, TSDP_HEADER_A_VA_ARGS("crypto", str), tsk_null);
                        }
						TSK_FREE(str);
					}
				}

				// DTLS-SRTP
				if(!is_srtp_sdes_activated && is_srtp_dtls_enabled){
					// get "fingerprint", "setup" and "connection" attributes
					if(!tsk_strnullORempty(TMEDIA_SESSION(self)->dtls.file_pbk)){
						tnet_dtls_hash_type_t fp_hash_remote;
						char* str = tsk_null;
						if((fp_hash_remote = trtp_manager_get_dtls_remote_fingerprint_hash(self->rtp_manager)) == tnet_dtls_hash_type_none){
							fp_hash_remote = TDAV_DFAULT_FP_HASH;
						}
						tsk_sprintf(&str, "%s %s", TNET_DTLS_HASH_NAMES[fp_hash_remote], trtp_manager_get_dtls_local_fingerprint(self->rtp_manager, fp_hash_remote));
#if TDAV_FIXME_MEDIA_LEVEL_DTLS_ATT
						tsdp_header_M_add_headers(base->M.lo, TSDP_HEADER_A_VA_ARGS("fingerprint", str), tsk_null);
#else
						_first_media_add_headers(self->local_sdp, TSDP_HEADER_A_VA_ARGS("fingerprint", str), tsk_null);
#endif
						TSK_FREE(str);
					}
#if TDAV_FIXME_MEDIA_LEVEL_DTLS_ATT
					tsdp_header_M_add_headers(base->M.lo, TSDP_HEADER_A_VA_ARGS("setup", TNET_DTLS_SETUP_NAMES[self->dtls.local.setup]), tsk_null);
					tsdp_header_M_add_headers(base->M.lo, TSDP_HEADER_A_VA_ARGS("connection", self->dtls.local.connection_new ? "new" : "existing"), tsk_null);
#else
					_first_media_add_headers(self->local_sdp, TSDP_HEADER_A_VA_ARGS("setup", TNET_DTLS_SETUP_NAMES[self->dtls.local.setup]), tsk_null);
					_first_media_add_headers(self->local_sdp, TSDP_HEADER_A_VA_ARGS("connection", self->dtls.local.connection_new ? "new" : "existing"), tsk_null);
#endif

					is_srtp_dtls_activated = tsk_true;
				}

				// activate the right SRTP type and disable others
				trtp_manager_set_srtp_type_remote(self->rtp_manager, 
					is_srtp_sdes_activated ? tmedia_srtp_type_sdes : (is_srtp_dtls_activated ? tmedia_srtp_type_dtls : tmedia_srtp_type_none));
				
				self->use_srtp |= (is_srtp_sdes_activated || is_srtp_dtls_activated);
				is_srtp_sdes_enabled &= is_srtp_sdes_activated;
				is_srtp_dtls_enabled &= is_srtp_dtls_activated;

			}//end-of-else
		}//end-of-HAVE_SRTP
#endif /* HAVE_SRTP */
		

		/* RFC 5939: acfg */
		if(self->sdp_caps->acfg.tag > 0){
			_sdp_acfg_to_sdp(base->M.lo, &self->sdp_caps->acfg);
		}

		/* Hold/Resume */
		tsdp_header_M_set_holdresume_att(base->M.lo, base->lo_held, base->ro_held, base->ro_inactive);		

		/* Update Proto*/
		tsk_strupdate(&base->M.lo->proto, 
			self->use_srtp 
			? (self->use_avpf ? (is_srtp_dtls_enabled ? "UDP/TLS/RTP/SAVPF" : "RTP/SAVPF") : (is_srtp_dtls_enabled ? "UDP/TLS/RTP/SAVP" : "RTP/SAVP")) 
			: (self->use_avpf ? "RTP/AVPF" : "RTP/AVP")
		);

		// RFC 5761: RTCP/RTP muxing
		if(self->use_rtcpmux){
			tsdp_header_M_add_headers(base->M.lo, TSDP_HEADER_A_VA_ARGS("rtcp-mux", tsk_null), tsk_null);
		}

		// draft-lennox-mmusic-sdp-source-attributes-01
		if(self->media_type == tmedia_audio || self->media_type == tmedia_video){
			char* str = tsk_null;			
			tsk_sprintf(&str, "%u cname:%s", self->rtp_manager->rtp.ssrc.local, self->rtp_manager->rtcp.cname); // also defined in RTCP session
			//tsdp_header_M_add_headers(base->M.lo, TSDP_HEADER_A_VA_ARGS("ssrc", str), tsk_null);	MAX-3396
			tsk_sprintf(&str, "%u mslabel:%s", self->rtp_manager->rtp.ssrc.local, "6994f7d1-6ce9-4fbd-acfd-84e5131ca2e2");
			//tsdp_header_M_add_headers(base->M.lo, TSDP_HEADER_A_VA_ARGS("ssrc", str), tsk_null); MAX-3396
			tsk_sprintf(&str, "%u label:%s", self->rtp_manager->rtp.ssrc.local, (self->media_type == tmedia_audio) ? "doubango@audio" : "doubango@video"); /* https://groups.google.com/group/discuss-webrtc/browse_thread/thread/6c44106c8ce7d6dc */
			//tsdp_header_M_add_headers(base->M.lo, TSDP_HEADER_A_VA_ARGS("ssrc", str), tsk_null); MAX-3396
			TSK_FREE(str);
		}

		/* ICE */
		if(self->ice_ctx){
			tsk_size_t index = 0;
			const tnet_ice_candidate_t* candidate;
			tsk_bool_t remote_use_rtcpmux = (base->M.ro && (tsdp_header_M_findA(base->M.ro, "rtcp-mux") != tsk_null));

			// FIXME: for RTCP, use "RFC 3605"in addition to "rtcp-mux"
			
			// "a=ice-mismatch" if "C=" line is not included in the candidates
			if((candidate = tnet_ice_ctx_get_local_candidate_at(self->ice_ctx, 0))){ // at least one candidate
				base->M.lo->port = candidate->socket->port;

				tsdp_header_M_remove(base->M.lo, tsdp_htype_C);
				tsdp_header_M_add_headers(base->M.lo,
						TSDP_HEADER_C_VA_ARGS("IN", TNET_SOCKET_TYPE_IS_IPV6(candidate->socket->type) ? "IP6" : "IP4", candidate->socket->ip),
						tsk_null);
				tsdp_header_M_add_headers(base->M.lo,
							TSDP_HEADER_A_VA_ARGS("ice-ufrag", candidate->ufrag),
							TSDP_HEADER_A_VA_ARGS("ice-pwd", candidate->pwd),
							tsk_null);
				// RTCWeb
				// "mid:" must not added without BUNDLE
				// tsdp_header_M_add_headers(base->M.lo,
				//	TSDP_HEADER_A_VA_ARGS("mid", self->media_type == tmedia_audio ? "audio" : "video"),
				//		tsk_null);
				
				while((candidate = tnet_ice_ctx_get_local_candidate_at(self->ice_ctx, index++))){
					if(self->use_rtcpmux && remote_use_rtcpmux && candidate->comp_id == TNET_ICE_CANDIDATE_COMPID_RTCP){
						continue; // do not add RTCP candidates if RTCP-MUX is activated (local + remote)
					}
					tsdp_header_M_add_headers(base->M.lo,
							TSDP_HEADER_A_VA_ARGS("candidate", tnet_ice_candidate_tostring((tnet_ice_candidate_t*)candidate)),
							tsk_null);
				}
			}
		}
		else{
			if(base->M.lo->C){
				tsk_strupdate(&base->M.lo->C->addr, self->rtp_manager->rtp.public_ip);
				tsk_strupdate(&base->M.lo->C->addrtype, (self->use_ipv6 ? "IP6" : "IP4"));
			}
			base->M.lo->port = self->rtp_manager->rtp.public_port;
		}

		if(self->media_type == tmedia_audio){
			///* 3GPP TS 24.229 - 6.1.1 General
			//	The UE shall include the MIME subtype "telephone-event" in the "m=" media descriptor in the SDP for audio media
			//	flows that support both audio codec and DTMF payloads in RTP packets as described in RFC 4733 [23].
			//*/
			//tsdp_header_M_add_fmt(base->M.lo, TMEDIA_CODEC_FORMAT_DTMF);
			//tsdp_header_M_add_headers(base->M.lo,
			//			TSDP_HEADER_A_VA_ARGS("fmtp", TMEDIA_CODEC_FORMAT_DTMF" 0-15"),
			//		tsk_null);
			//tsdp_header_M_add_headers(base->M.lo,
			//			TSDP_HEADER_A_VA_ARGS("rtpmap", TMEDIA_CODEC_FORMAT_DTMF" telephone-event/8000"),
			//		tsk_null);
		}

		/* QoS */
		if(base->qos){
			tmedia_qos_tline_t* ro_tline;
			if(base->M.ro && (ro_tline = tmedia_qos_tline_from_sdp(base->M.ro))){
				tmedia_qos_tline_set_ro(base->qos, ro_tline);
				TSK_OBJECT_SAFE_FREE(ro_tline);
			}
			tmedia_qos_tline_to_sdp(base->qos, base->M.lo);
		}
DONE:;
	} // end-of-if(*updated)

	return base->M.lo;
}

int tdav_session_av_set_ro(tdav_session_av_t* self, const struct tsdp_header_M_s* m, tsk_bool_t *updated)
{
	tmedia_codecs_L_t* neg_codecs;
	tsk_bool_t srtp_sdes_neg_ok = tsk_false, srtp_dtls_neg_ok = tsk_false;
	tsk_bool_t is_srtp_remote_mandatory, is_srtp_dtls_remote_mandatory, is_srtp_sdes_remote_mandatory;
	tsk_bool_t is_srtp_local_mandatory, is_srtp_dtls_local_enabled, is_srtp_sdes_local_enabled;
	tmedia_session_t* base = TMEDIA_SESSION(self);
	RTP_PROFILE_T profile_remote;
	int32_t acfg_idx = -1;

	if(!base || !m || !updated){
		TSK_DEBUG_ERROR("Invalid parameter");
		return -1;
	}
	if(!self->rtp_manager){
		TSK_DEBUG_ERROR("RTP manager is null. Did you forget to prepare the session?");
		return -1;
	}

	/* update remote offer */
	TSK_OBJECT_SAFE_FREE(base->M.ro);
	base->M.ro = tsk_object_ref((void*)m);

	*updated = tsk_false;

	// check if the RTP profile from remote party is supported or not
	if((profile_remote = _sdp_profile_from_string(m->proto)) == RTP_PROFILE_NONE){
		TSK_DEBUG_ERROR("%s not supported as RTP profile");
		return -2;
	}
	// check that all options in the profile are supported
	if((is_srtp_remote_mandatory = (profile_remote & RTP_PROFILE_SECURE))  && (self->srtp_mode == tmedia_srtp_mode_none)){
		TSK_DEBUG_ERROR("Remote party requesting secure transport (%s) but this option is not enabled", m->proto);
		return -2;
	}
	if((is_srtp_sdes_remote_mandatory = (profile_remote & RTP_PROFILE_SECURE_SDES) == RTP_PROFILE_SECURE_SDES) && !(self->srtp_type & tmedia_srtp_type_sdes)){
		TSK_DEBUG_ERROR("Remote party requesting SRTP-SDES (%s) but this option is not enabled", m->proto);
		return -2;
	}
	if((is_srtp_dtls_remote_mandatory = (profile_remote & RTP_PROFILE_SECURE_DTLS) == RTP_PROFILE_SECURE_DTLS) && !(self->srtp_type & tmedia_srtp_type_dtls)){
		TSK_DEBUG_ERROR("Remote party requesting DTLS-DTLS (%s) but this option is not enabled", m->proto);
		return -2;
	}
	is_srtp_local_mandatory = (self->srtp_mode == tmedia_srtp_mode_mandatory) && (self->srtp_type != tmedia_srtp_type_none);
	is_srtp_dtls_local_enabled = (self->srtp_mode != tmedia_srtp_mode_none) && (self->srtp_type & tmedia_srtp_type_dtls);
	is_srtp_sdes_local_enabled = (self->srtp_mode != tmedia_srtp_mode_none) && (self->srtp_type & tmedia_srtp_type_sdes); 

	if(base->M.lo){
		if((neg_codecs = tmedia_session_match_codec(base, m))){
			/* update negociated codecs */
			TSK_OBJECT_SAFE_FREE(base->neg_codecs);
			base->neg_codecs = neg_codecs;
			*updated = tsk_true;
		}
		else{
			TSK_DEBUG_ERROR("None Match");
			return -1;
		}
		/* QoS */
		if(base->qos){
			tmedia_qos_tline_t* ro_tline;
			if(base->M.ro && (ro_tline = tmedia_qos_tline_from_sdp(base->M.ro))){
				tmedia_qos_tline_set_ro(base->qos, ro_tline);
				TSK_OBJECT_SAFE_FREE(ro_tline);
			}
		}
		/* AVPF */
		if(_sdp_str_contains(base->M.lo->proto, "AVPF")){
			self->use_avpf = tsk_true;
		}
	}

	/* RFC 5939 - Session Description Protocol (SDP) Capability Negotiation */
	{ 
		sdp_acaps_xt acaps;
		sdp_tcaps_xt tcaps;

		_sdp_acfg_reset(&self->sdp_caps->acfg);

		_sdp_acaps_reset(&acaps);
		_sdp_tcaps_reset(&tcaps);
		_sdp_pcfgs_reset(&self->sdp_caps->remote);

		// session-level attributes
		if(self->remote_sdp){
			_sdp_pcfgs_from_sdp(self->remote_sdp, &acaps, &tcaps, &self->sdp_caps->remote, tsk_false);
		}
		// media-level attributes
		_sdp_pcfgs_from_sdp(base->M.ro, &acaps, &tcaps, &self->sdp_caps->remote, tsk_false);
	}

	/* get connection associated to this media line
	* If the connnection is global, then the manager will call tdav_session_audio_set() */
	if(m->C && m->C->addr){
		tsk_strupdate(&self->remote_ip, m->C->addr);
		self->use_ipv6 = tsk_striequals(m->C->addrtype, "IP6");
	}
	/* set remote port */
	self->remote_port = m->port;

	/* RTCP-MUX */
	self->use_rtcpmux &= (tsdp_header_M_findA(m, "rtcp-mux") != tsk_null);
	if(self->ice_ctx){
		tnet_ice_ctx_set_rtcpmux(self->ice_ctx, self->use_rtcpmux);
	}

	/* Remote SSRC */
	{
		// will be also updated based on received RTP packets
		const tsdp_header_A_t* ssrcA = tsdp_header_M_findA(m, "ssrc");
		if(ssrcA && ssrcA->value){
			if(sscanf(ssrcA->value, "%u %*s", &self->rtp_manager->rtp.ssrc.remote) != EOF){
				TSK_DEBUG_INFO("Remote SSRC = %u", self->rtp_manager->rtp.ssrc.remote);
			}
		}
	}

	/* RTCWeb Type */
	if(self->remote_sdp){
		const tsdp_header_S_t* S = (const tsdp_header_S_t*)tsdp_message_get_header(self->remote_sdp, tsdp_htype_S);
		if(S && !tsk_strnullORempty(S->value)){
			struct rtcweb_type { const char* name; tmedia_rtcweb_type_t type; };
			static const struct rtcweb_type rtcweb_types[] =
			{
				{ "firefox", tmedia_rtcweb_type_firefox },
				{ "chrome", tmedia_rtcweb_type_chrome },
				{ "bowser", tmedia_rtcweb_type_ericsson },
				{ "doubango", tmedia_rtcweb_type_doubango },
			};
			static const int32_t rtcweb_types_count = sizeof(rtcweb_types)/sizeof(rtcweb_types[0]);
			int32_t i;
			for(i = 0; i < rtcweb_types_count; ++i){
				if(_sdp_str_contains(S->value, rtcweb_types[i].name)){
					trtp_manager_set_rtcweb_type_remote(self->rtp_manager, rtcweb_types[i].type);
					break;
				}
			}
		}
	}

	/* SRTP */
#if HAVE_SRTP
	// this is SRTP negotiation -> do not trust the remote profile
	if(is_srtp_dtls_local_enabled || is_srtp_sdes_local_enabled){
		tsk_size_t i, j;
		const sdp_acap_xt *acap;
		int ret;
		if(is_srtp_sdes_local_enabled){
			const tsdp_header_A_t* A;
			const char* cryptos[2] = { tsk_null };

			/* 1. check crypto lines from the SDP */
			i = 0;
			while((A = tsdp_header_M_findA_at(m, "crypto", i))){
				cryptos[i++] = A->value;
				if(i >= (sizeof(cryptos)/sizeof(cryptos[0]))){
					break;
				}
			}

			/* 2. check crypto lines from the caps (RFC 5939)*/
			if(!cryptos[0]){
				tsk_size_t k = 0;
				for(i = 0; (i < SDP_CAPS_COUNT_MAX && self->sdp_caps->remote[i].tag > 0); ++i){
					j = 0;
					while((acap = _sdp_acaps_find_by_field(&self->sdp_caps->remote[i].acaps, "crypto", j++))){
						if(k < (sizeof(cryptos)/sizeof(cryptos[0]))){
							// remove "crypto: "
							if((cryptos[k] = strstr(acap->value, ":")) && ++cryptos[k]){
								while(isspace(*cryptos[k])) ++cryptos[k];
								++k;
							}
						}
					}
					if(k != 0){ // do not mix crypto lines from different pcfgs
						acfg_idx = i;
						break;
					}
				}
			}
			
			/* 3. match cryptos */
			for(i = 0; i< sizeof(cryptos)/sizeof(cryptos[0]); ++i){
				if(!cryptos[i]){
					break;
				}
				if((ret = trtp_srtp_set_crypto_remote(self->rtp_manager, cryptos[i])) == 0){
					srtp_sdes_neg_ok = tsk_true;
					break;
				}
			}			
		} // end-of-sdes

		if(!srtp_sdes_neg_ok && is_srtp_dtls_local_enabled){
			int ret;
			const tsdp_header_A_t *setupA = tsk_null, *fpA = tsk_null, *connectionA = tsk_null;
			const char* fingerprints[4] = { tsk_null };
			const char* setups[4] = { tsk_null };
			const char* connections[4] = { tsk_null };
			const char* connection = tsk_null;
			const char* setup = tsk_null;

			/* 1. check DTLS attributes from the SDP */

			if(self->remote_sdp){
				setupA = tsdp_message_get_headerA(self->remote_sdp, "setup");
				fpA = tsdp_message_get_headerA(self->remote_sdp, "fingerprint");
				connectionA = tsdp_message_get_headerA(self->remote_sdp, "connection");
			}
			if(!setupA) setupA = tsdp_header_M_findA(m, "setup");
			if(!fpA) fpA = tsdp_header_M_findA(m, "fingerprint");
			if(!connectionA) connectionA = tsdp_header_M_findA(m, "connection");
			
			if(setupA) setups[0] = setupA->value;
			if(fpA) fingerprints[0] = fpA->value;
			if(connectionA) connections[0] = connectionA->value;

			/* 2. check DTLS attributes from from the caps (RFC 5939) */
			if(!srtp_dtls_neg_ok && !fingerprints[0]){
				tsk_size_t k_fp = 0, k_st = 0, k_conn = 0;
				for(i = 0; (i < SDP_CAPS_COUNT_MAX && self->sdp_caps->remote[i].tag > 0); ++i){
					// "fingerprint"
					j = 0;
					while((acap = _sdp_acaps_find_by_field(&self->sdp_caps->remote[i].acaps, "fingerprint", j++))){
						if(k_fp < (sizeof(fingerprints)/sizeof(fingerprints[0]))){
							if((fingerprints[k_fp] = strstr(acap->value, ":")) && ++fingerprints[k_fp]){
								while(isspace(*fingerprints[k_fp])) ++fingerprints[k_fp];
								++k_fp;
							}
						}
					}
					// "setup"
					j = 0;
					while((acap = _sdp_acaps_find_by_field(&self->sdp_caps->remote[i].acaps, "setup", j++))){
						if(k_st < (sizeof(setups)/sizeof(setups[0]))){
							if((setups[k_st] = strstr(acap->value, ":")) && ++setups[k_st]){
								while(isspace(*setups[k_st])) ++setups[k_st];
								++k_st;
							}
						}
					}
					// "connection"
					j = 0;
					while((acap = _sdp_acaps_find_by_field(&self->sdp_caps->remote[i].acaps, "connection", j++))){
						if(k_conn < (sizeof(connections)/sizeof(connections[0]))){
							if((connections[k_conn] = strstr(acap->value, ":")) && ++connections[k_conn]){
								while(isspace(*connections[k_conn])) ++connections[k_conn];
								++k_conn;
							}
						}
					}

					if(k_fp || k_st || k_conn){ // do not mix crypto lines from different pcfgs
						acfg_idx = i;
						break;
					}
				}
			}

			/* 3. setup DTLS connection using negotiated attributes */
			
			if(!srtp_dtls_neg_ok && fingerprints[0]){
				tnet_fingerprint_t fingerprint;
				char hash[16];
				for(i = 0; i < sizeof(fingerprints)/sizeof(fingerprints[0]) && !srtp_dtls_neg_ok; ++i){
					if(!fingerprints[i]){
						break;
					}
					if(sscanf(fingerprints[i], "%15s %255s", hash, fingerprint) >= 2){
						if((ret = trtp_manager_set_dtls_remote_fingerprint(self->rtp_manager, &fingerprint, hash)) == 0){
							acfg_idx = i;
							srtp_dtls_neg_ok = tsk_true;
							break;
						}
					}
				}
			}

			// only accept sdp without fingerprints if certificate verification is OFF
			if(!srtp_dtls_neg_ok && !fingerprints[0] && !TMEDIA_SESSION(self)->dtls.verify){
				for(i = 0; (i < SDP_CAPS_COUNT_MAX && self->sdp_caps->remote[i].tag > 0); ++i){
					if(self->sdp_caps->remote[i].tcap.tag > 0 && (self->sdp_caps->remote[i].tcap.profile & RTP_PROFILE_SECURE_DTLS) == RTP_PROFILE_SECURE_DTLS){
						acfg_idx = i;
						break;
					}
				}
			}

			// defaults
			if(!connection) connection = connections[acfg_idx != -1 ? acfg_idx : 0];
			if(!setup) setup = setups[acfg_idx != -1 ? acfg_idx : 0];

			if((!connection || !setup) && (is_srtp_dtls_remote_mandatory || is_srtp_local_mandatory || (acfg_idx != -1 && (self->sdp_caps->remote[acfg_idx].tcap.profile & RTP_PROFILE_SECURE_DTLS) == RTP_PROFILE_SECURE_DTLS))){
				if(!connection) connection = (self->dtls.local.connection_new ? "existing" : "new");
				if(!setup) setup = (self->dtls.local.setup == tnet_dtls_setup_active 
					? "passive" 
					: (self->dtls.local.setup == tnet_dtls_setup_passive ? "active" : (base->M.lo ? "passive" : "active")));
			}

			if(connection && setup){
				// update local setup according to remote setup
				ret = _tdav_session_av_dtls_set_remote_setup(self, 
					tnet_dtls_get_setup_from_string(setup),
					!tsk_striequals(connection, "existing")
					);
				if(ret == 0){
					// pass new local values to the RTP manager
					ret = trtp_manager_set_dtls_local_setup(self->rtp_manager, self->dtls.local.setup, self->dtls.local.connection_new);
					srtp_dtls_neg_ok = (ret == 0);
				}
			}

		}// end-of-dtls
	}//end-of-if(srtp=optional|mandatory)
	
	self->use_srtp = trtp_srtp_is_initialized(self->rtp_manager);

	// activate the right SRTP type and disable others
	trtp_manager_set_srtp_type_remote(self->rtp_manager, 
		srtp_sdes_neg_ok ? tmedia_srtp_type_sdes : (srtp_dtls_neg_ok ? tmedia_srtp_type_dtls : tmedia_srtp_type_none));
	
#endif

	// set actual config
	if(acfg_idx == -1){
		// none matched (means SRTP negotiation failed or not enabled -> try to negotiate AVP(F))
		int32_t i;
		for(i = 0; (i < SDP_CAPS_COUNT_MAX && self->sdp_caps->remote[i].tag > 0); ++i){
			if(self->sdp_caps->remote[i].tcap.tag > 0){
				if(self->sdp_caps->remote[i].tcap.profile == RTP_PROFILE_AVPF){
					 acfg_idx = i;
					 break;
				}
			}
		}
	}
	if(acfg_idx != -1){
		self->sdp_caps->acfg = self->sdp_caps->remote[acfg_idx];
	}
	
	if(!srtp_sdes_neg_ok && !srtp_dtls_neg_ok && (is_srtp_remote_mandatory || is_srtp_local_mandatory)){
		TSK_DEBUG_ERROR("SRTP negotiation failed");
		return -4;
	}

	return 0;
}

const tmedia_codec_t* tdav_session_av_get_best_neg_codec(const tdav_session_av_t* self)
{
	const tsk_list_item_t* item;
	if(!self){
		TSK_DEBUG_ERROR("Invalid parameter");
		return tsk_null;
	}
	
	tsk_list_foreach(item, TMEDIA_SESSION(self)->neg_codecs){
		// exclude DTMF, RED and ULPFEC
		if(!TDAV_IS_DTMF_CODEC(item->data) && !TDAV_IS_ULPFEC_CODEC(item->data) && !TDAV_IS_RED_CODEC(item->data) 
			&& TMEDIA_CODEC(item->data)->plugin && TMEDIA_CODEC(item->data)->plugin->encode && TMEDIA_CODEC(item->data)->plugin->decode){
			return TMEDIA_CODEC(item->data);
		}
	}
	return tsk_null;
}

const tmedia_codec_t* tdav_session_av_get_red_codec(const tdav_session_av_t* self)
{
	const tsk_list_item_t* item;
	if(!self){
		TSK_DEBUG_ERROR("Invalid parameter");
		return tsk_null;
	}
	
	tsk_list_foreach(item, TMEDIA_SESSION(self)->neg_codecs){
		const tmedia_codec_t* codec = (const tmedia_codec_t*)item->data;
		if(TDAV_IS_RED_CODEC(codec)){
			return TMEDIA_CODEC(item->data);
		}
	}
	return tsk_null;
}

static void* TSK_STDCALL _tdav_session_av_error_async_thread(void* usrdata)
{
	if(usrdata){
		tdav_session_av_t* self = (tdav_session_av_t*)usrdata;
		tsk_safeobj_lock(self);
		if(TMEDIA_SESSION(self)->onerror_cb.fun){
			TMEDIA_SESSION(self)->onerror_cb.fun(TMEDIA_SESSION(self)->onerror_cb.usrdata, TMEDIA_SESSION(self), self->last_error.reason, self->last_error.is_fatal);
		}
		tsk_safeobj_unlock(self);
		tsk_object_unref(self); // see _tdav_session_av_raise_error_async()
	}
	return tsk_null;
}

static int _tdav_session_av_raise_error_async(struct tdav_session_av_s* self, tsk_bool_t is_fatal, const char* reason)
{
	int ret;
	if(!self){
		TSK_DEBUG_ERROR("Invalid parameter");
		return -1;
	}

	tsk_safeobj_lock(self);

	tsk_object_ref(self); // see _tdav_session_av_error_async_thread()

	if(self->last_error.tid[0]){
		tsk_thread_join(self->last_error.tid);
	}

	self->last_error.is_fatal = is_fatal;
	tsk_strupdate(&self->last_error.reason, reason);
	if((ret = tsk_thread_create(self->last_error.tid, _tdav_session_av_error_async_thread, self)) != 0){
		tsk_object_unref(self);
		goto bail;
	}

bail:
	tsk_safeobj_unlock(self);

	return ret;
}

#if HAVE_SRTP
static int _tdav_session_av_srtp_dtls_cb(const void* usrdata, enum trtp_srtp_dtls_event_type_e type, const char* reason)
{
	tdav_session_av_t* self = (tdav_session_av_t*)usrdata;

	tsk_safeobj_lock(self);
	switch(type){
		case trtp_srtp_dtls_event_type_handshake_failed:
		case trtp_srtp_dtls_event_type_fatal_error:
			{
				if(TMEDIA_SESSION(self)->onerror_cb.fun){
					static const tsk_bool_t __is_fatal = tsk_true;
					_tdav_session_av_raise_error_async(self, __is_fatal, reason);
				}
				break;
			}
		case trtp_srtp_dtls_event_type_handshake_succeed:
			{
				break;
			}
		case trtp_srtp_dtls_event_type_started:
			{
				// start producer and consumer
				if(self->rtp_manager && self->rtp_manager->is_started){
					if(self->consumer) tmedia_consumer_start(self->consumer);
					if(self->producer) tmedia_producer_start(self->producer);
				}
				break;
			}
	}
	tsk_safeobj_unlock(self);

	return 0;
}
#endif /* HAVE_SRTP */

static int _tdav_session_av_red_cb(const void* usrdata, const struct trtp_rtp_packet_s* packet)
{
	tdav_session_av_t* self = (tdav_session_av_t*)usrdata;
	if(self->rtp_manager && self->rtp_manager->rtp.cb.fun){
		return self->rtp_manager->rtp.cb.fun(self->rtp_manager->rtp.cb.usrdata, packet);
	}
	return 0;
}

int _tdav_session_av_dtls_set_remote_setup(struct tdav_session_av_s* self, tnet_dtls_setup_t setup, tsk_bool_t connection_new)
{
	if(self){
		TSK_DEBUG_INFO("dtls.remote.setup=%s", TNET_DTLS_SETUP_NAMES[(int)setup]);
		self->dtls.remote.setup = setup;
		self->dtls.remote.connection_new = connection_new;
		switch(self->dtls.remote.setup){
			case tnet_dtls_setup_none:
			default:
				self->dtls.local.setup = tnet_dtls_setup_actpass;
				self->dtls.local.connection_new = tsk_true; // RTP transport always unprepared for reINVITE/UPDATE -> new connection
				break;
			case tnet_dtls_setup_active:
				self->dtls.local.setup = tnet_dtls_setup_passive;
				self->dtls.local.connection_new = tsk_true;
				break;
			case tnet_dtls_setup_passive:
				self->dtls.local.setup = tnet_dtls_setup_active;
				self->dtls.local.connection_new = tsk_true;
				break;
			case tnet_dtls_setup_actpass:
				self->dtls.local.setup = (self->dtls.local.setup == tnet_dtls_setup_actpass || self->dtls.local.setup == tnet_dtls_setup_active) 
					? tnet_dtls_setup_active
					: tnet_dtls_setup_passive;
				self->dtls.local.connection_new = tsk_true;
				break;
		}
	}
	return 0;
}

const tmedia_codec_t* tdav_session_av_get_ulpfec_codec(const tdav_session_av_t* self)
{
	const tsk_list_item_t* item;
	if(!self){
		TSK_DEBUG_ERROR("Invalid parameter");
		return tsk_null;
	}
	
	tsk_list_foreach(item, TMEDIA_SESSION(self)->neg_codecs){
		if(TDAV_IS_ULPFEC_CODEC(item->data)){
			return TMEDIA_CODEC(item->data);
		}
	}
	return tsk_null;
}

int tdav_session_av_deinit(tdav_session_av_t* self)
{
	if(!self){
		TSK_DEBUG_ERROR("Invalid parameter");
		return -1;
	}

	/* deinit self (rtp manager should be destroyed after the producer) */
	TSK_OBJECT_SAFE_FREE(self->consumer);
	TSK_OBJECT_SAFE_FREE(self->producer);
	TSK_OBJECT_SAFE_FREE(self->rtp_manager);
	TSK_OBJECT_SAFE_FREE(self->sdp_caps);
	TSK_OBJECT_SAFE_FREE(self->remote_sdp);
	TSK_OBJECT_SAFE_FREE(self->local_sdp);
	TSK_FREE(self->remote_ip);
	TSK_FREE(self->local_ip);

	/* RED and ULPFEC codecs */
	TSK_OBJECT_SAFE_FREE(self->red.codec);
	TSK_OBJECT_SAFE_FREE(self->ulpfec.codec);

	/* NAT Traversal context */
	TSK_OBJECT_SAFE_FREE(self->natt_ctx);
	TSK_OBJECT_SAFE_FREE(self->ice_ctx);

	/* Last error */
	if(self->last_error.tid[0]){
		tsk_thread_join(self->last_error.tid);
	}
	TSK_FREE(self->last_error.reason);

	tsk_safeobj_deinit(self);

	/* deinit base */
	tmedia_session_deinit(TMEDIA_SESSION(self));

	return 0;
}









static const tsdp_header_A_t* _sdp_findA_at(const sdp_headerM_Or_Message* sdp, const char* field, tsk_size_t index)
{
	if(sdp){
		if(TSK_OBJECT_HEADER(sdp)->__def__ == tsdp_message_def_t){
			return tsdp_message_get_headerA_at((const tsdp_message_t*)sdp, field, index);
		}
		else if(TSK_OBJECT_HEADER(sdp)->__def__ == tsdp_header_M_def_t){
			return tsdp_header_M_findA_at((const tsdp_header_M_t*)sdp, field, index);
		}
	}
		
	TSK_DEBUG_ERROR("Invalid parameter");
	return tsk_null;
}

static int _sdp_add_headerA(sdp_headerM_Or_Message* sdp, const char* field, const char* value)
{
	if(sdp && field){
		if(TSK_OBJECT_HEADER(sdp)->__def__ == tsdp_message_def_t){
			return tsdp_message_add_headers((tsdp_message_t*)sdp,
						TSDP_HEADER_A_VA_ARGS(field, value),
						tsk_null);
		}
		else if(TSK_OBJECT_HEADER(sdp)->__def__ == tsdp_header_M_def_t){
			return tsdp_header_M_add_headers((tsdp_header_M_t*)sdp,
						TSDP_HEADER_A_VA_ARGS(field, value),
						tsk_null);
		}
	}

	TSK_DEBUG_ERROR("Invalid parameter");
	return -1;
}

static RTP_PROFILE_T _sdp_profile_from_string(const char* profile)
{
	int32_t i;
	for(i = 0; i < RTP_PROFILES_COUNT; ++i){
		if(tsk_striequals(RTP_PROFILES[i].name, profile)){
			return RTP_PROFILES[i].type;
		}
	}
	return RTP_PROFILE_NONE;
}

static const char* _sdp_profile_to_string(RTP_PROFILE_T profile)
{
	int32_t i;
	for(i = 0; i < RTP_PROFILES_COUNT; ++i){
		if(RTP_PROFILES[i].type == profile){
			return RTP_PROFILES[i].name;
		}
	}
	return tsk_null;
}

_SDP_DECLARE_INDEX_OF(acap);

static const sdp_acap_xt* _sdp_acaps_find_by_field(const sdp_acap_xt (*acaps)[SDP_CAPS_COUNT_MAX], const char* field, int32_t index)
{
	int32_t i, j, k, size;

	if(!acaps || !field){
		TSK_DEBUG_ERROR("Invalid paramter");
		return tsk_null;
	}

	i = 0, j = 0;
	size = tsk_strlen(field);
	while((*acaps)[j].tag && j < SDP_CAPS_COUNT_MAX){
		k = _sdp_str_index_of((*acaps)[j].value, field);
		if(k == 0 && (*acaps)[j].value[size] == ':'){
			if(i == index){
				return &(*acaps)[j];
			}
			++i;
		}
		++j;
	}
	return tsk_null;
}

static int _sdp_acaps_from_sdp(const sdp_headerM_Or_Message* sdp, sdp_acap_xt (*acaps)[SDP_CAPS_COUNT_MAX], tsk_bool_t reset)
{
	tsk_size_t acaps_count, acaps_idx;
	const tsdp_header_A_t* A;
	int32_t tag, index, size;

	if(!sdp || !acaps){
		TSK_DEBUG_ERROR("Invalid parameter");
		return -1;
	}

	
	if(reset){
		_sdp_acaps_reset(acaps);
		acaps_count = 0;
	}
	else{
		if((acaps_count = _sdp_acaps_indexof(acaps, 0)) == -1){
			TSK_DEBUG_ERROR("No room to append items");
			return -1;
		}
	}
	
	acaps_idx = 0;
	while((A = _sdp_findA_at(sdp, "acap", acaps_idx++))){
		if(!(size = tsk_strlen(A->value))){
			goto next;
		}
		if(sscanf(A->value, "%d", &tag) == EOF){
			TSK_DEBUG_ERROR("sscanf(%s) failed", A->value);
			break;
		}
		if(tag <= 0 || (tag + 1) > SDP_CAPS_COUNT_MAX){
			TSK_DEBUG_WARN("Ignoring tag with value = %d");
			goto next;
		}

		index = _sdp_integer_length(tag) + 1;/*SPACE*/
		if(index >= size){
			TSK_DEBUG_WARN("a=%s is empty", A->value);
			goto next;
		}
		
		(*acaps)[acaps_count].tag = tag;
		(*acaps)[acaps_count].value = &A->value[index];
next:
		if(++acaps_count >= SDP_CAPS_COUNT_MAX){
			break;
		}
	}

	return 0;
}

_SDP_DECLARE_INDEX_OF(tcap);

static int _sdp_tcaps_from_sdp(const sdp_headerM_Or_Message* sdp, sdp_tcap_xt (*tcaps)[SDP_CAPS_COUNT_MAX], tsk_bool_t reset)
{
	tsk_size_t tcaps_count, tcaps_idx, profiles_count;
	const tsdp_header_A_t* A;
	int32_t tag, index, size, tag_fake;
	char tcap[256];

	if(!sdp || !tcaps){
		TSK_DEBUG_ERROR("Invalid parameter");
		return -1;
	}

	if(reset){
		_sdp_tcaps_reset(tcaps);
		tcaps_count = 0;
	}
	else{
		if((tcaps_count = _sdp_tcaps_indexof(tcaps, 0)) == -1){
			TSK_DEBUG_ERROR("No room to append items");
			return -1;
		}
	}	

	profiles_count = 0;
	index = 0;
	tcaps_idx = 0;
	while((A = _sdp_findA_at(sdp, "tcap", tcaps_idx++))){
		if(!(size = tsk_strlen(A->value))){
			goto next;
		}
		if(sscanf(&A->value[index], "%d", &tag) == EOF || (_sdp_integer_length(tag) + 1 >= size)){
			TSK_DEBUG_ERROR("sscanf(%s) failed", A->value);
			break;
		}
		if(tag <= 0 || (tag + 1) > SDP_CAPS_COUNT_MAX){
			TSK_DEBUG_WARN("Ignoring tag with value = %d", tag);
			goto next;
		}

		index += _sdp_integer_length(tag) + 1/*SPACE*/;
		
		profiles_count = 0;
		tag_fake = tag;
		while(sscanf(&A->value[index], "%255s", &tcap) != EOF){
			if(tag_fake < SDP_CAPS_COUNT_MAX){
				(*tcaps)[tcaps_count + profiles_count].tag = tag_fake;
				(*tcaps)[tcaps_count + profiles_count].profile = _sdp_profile_from_string(tcap); // split profiles
			}
			if((index += tsk_strlen(tcap) + 1/*SPACE*/) >= size){
				break;
			}
			++tag_fake;
			++profiles_count;
		}
next:
		if(++tcaps_count >= SDP_CAPS_COUNT_MAX){
			break;
		}
	}

	return 0;
}

static int _sdp_acfg_to_sdp(sdp_headerM_Or_Message* sdp, const sdp_acfg_xt *acfg)
{
	int32_t i_a_caps;
	char *acfg_str = tsk_null;

	if(!sdp || !acfg || acfg->tag <= 0){
		TSK_DEBUG_ERROR("Invalid parameter");
		return -1;
	}

	// acfg: tag
	tsk_strcat_2(&acfg_str, "%d", acfg->tag);
	// acfg: t=
	if(acfg_str && acfg->tcap.tag > 0){
		tsk_strcat_2(&acfg_str, " t=%d", acfg->tcap.tag);
	}
	// acfg: a=
	for (i_a_caps = 0; acfg_str && i_a_caps < SDP_CAPS_COUNT_MAX; ++i_a_caps){
		if(acfg->acaps[i_a_caps].tag <= 0){
			break;
		}
		if(i_a_caps == 0){
			tsk_strcat_2(&acfg_str, " a=%d", acfg->acaps[i_a_caps].tag);
		}
		else{
			tsk_strcat_2(&acfg_str, "%s%s%d%s", // e.g. |2 or ,6 or ,[2]
					acfg->acaps[i_a_caps].or ? "|" : ",",
					acfg->acaps[i_a_caps].optional ? "[" : "",
					acfg->acaps[i_a_caps].tag,
					acfg->acaps[i_a_caps].optional ? "]" : ""
				);
		}
	}

	// a=acfg:
	if(acfg_str){
		_sdp_add_headerA(sdp, "acfg", acfg_str);
		TSK_FREE(acfg_str);
	}

	return 0;
}

_SDP_DECLARE_INDEX_OF(pcfg);

static int _sdp_pcfgs_from_sdp(const sdp_headerM_Or_Message* sdp, sdp_acap_xt (*acaps)[SDP_CAPS_COUNT_MAX], sdp_tcap_xt (*tcaps)[SDP_CAPS_COUNT_MAX], sdp_pcfg_xt (*pcfgs)[SDP_CAPS_COUNT_MAX], tsk_bool_t reset)
{
	tsk_size_t pcfgs_count, pcfgs_idx;
	const tsdp_header_A_t* A;
	int32_t tag, index = 0, size, t, a_tag, indexof;
	sdp_tcap_xt* tcap_curr;
	int ret;
	char pcfg[256], a[256];

	if(!sdp || !acaps || !tcaps || !pcfgs){
		TSK_DEBUG_ERROR("Invalid parameter");
		return -1;
	}

	if((ret = _sdp_tcaps_from_sdp(sdp, tcaps, reset))){
		return ret;
	}
	if((ret = _sdp_acaps_from_sdp(sdp, acaps, reset))){
		return ret;
	}

	if(reset){
		_sdp_pcfgs_reset(pcfgs);
		pcfgs_count = 0;
	}
	else{
		if((pcfgs_count = _sdp_pcfgs_indexof(pcfgs, 0)) == -1){
			TSK_DEBUG_ERROR("No room to append items");
			return -1;
		}
	}

	pcfgs_idx = 0;
	tcap_curr = tsk_null;
	while((A = _sdp_findA_at(sdp, "pcfg", pcfgs_idx++))){
		if(!(size = tsk_strlen(A->value))){
			goto next_A;
		}
		if(sscanf(A->value, "%d", &tag) == EOF || (_sdp_integer_length(tag) + 1 >= size)){
			TSK_DEBUG_ERROR("sscanf(%s) failed", A->value);
			break;
		}
		if(tag <= 0 || (tag + 1) > SDP_CAPS_COUNT_MAX){
			TSK_DEBUG_WARN("Ignoring tag with value = %d");
			goto next_A;
		}
		
		(*pcfgs)[pcfgs_count].tag = tag;

		index = _sdp_integer_length(tag) + 1/*SPACE*/;

		while(sscanf(&A->value[index], "%255s", &pcfg) != EOF){
			if(_sdp_str_starts_with(&A->value[index], "t=") && sscanf(pcfg, "t=%d", &t) != EOF){
				if(t <= 0 || t + 1 >= SDP_CAPS_COUNT_MAX){
					TSK_DEBUG_ERROR("t = %d ignored", t);
					goto next_pcfg;
				}
				// tcap is something like a=tcap:1 RTP/SAVPF RTP/SAVP RTP/AVPF
				// tcap [2] is "RTP/SAVP" -> not indexed by tag
				tcap_curr = &(*pcfgs)[pcfgs_count].tcap;
				if((indexof = _sdp_tcaps_indexof(tcaps, t)) == -1){
					TSK_DEBUG_ERROR("Failed to find 'tcap' with tag=%d", t);
					goto next_pcfg;
				}
				*tcap_curr = (*tcaps)[indexof];
			}
			else{
				if(_sdp_str_starts_with(&A->value[index], "a=") && sscanf(pcfg, "a=%255s", a) != EOF){
					char a_copy[sizeof(a)], *pch;
					tsk_size_t pcfg_acfgs_count = 0;
					sdp_acap_xt* acap;
					memcpy(a_copy, a, sizeof(a));

					pch = strtok (a, ",[]|");
					while(pch){
						a_tag = atoi(pch);
						if(a_tag <= 0 || a_tag + 1 >= SDP_CAPS_COUNT_MAX){
							TSK_DEBUG_ERROR("a = %d ignored", a_tag);
							goto next_a;
						}
						if((indexof = _sdp_acaps_indexof(acaps, a_tag)) == -1){
							TSK_DEBUG_ERROR("Failed to find 'acap' with tag=%d", a_tag);
							goto next_a;
						}
						acap = &(*pcfgs)[pcfgs_count].acaps[pcfg_acfgs_count++];
						*acap = (*acaps)[indexof];
						acap->optional = (pch != a && a_copy[pch - a - 1] == '[') ? 1 : 0;
						acap->or = (pch != a && a_copy[pch - a - 1] == '|') ? 1 : 0;
next_a:
						pch = strtok (NULL, ",[]|");
					}
				}
				tcap_curr = tsk_null;
			}
next_pcfg:
			if((index += tsk_strlen(pcfg) + 1/*SPACE*/) >= size){
				break;
			}
		}
next_A:
		if(++pcfgs_count >= SDP_CAPS_COUNT_MAX){
			break;
		}
	}

	return ret;
}

static int _sdp_pcfgs_to_sdp(sdp_headerM_Or_Message* sdp, const sdp_pcfg_xt (*pcfgs)[SDP_CAPS_COUNT_MAX])
{
	int32_t i_pcfgs, i_a_caps, i_serialized_acaps;
	char *pcfg = tsk_null, *acap = tsk_null, *tcap = tsk_null;
	sdp_acaps_xt serialized_acaps; /* to avoid duplication */

	if(!sdp || !pcfgs){
		TSK_DEBUG_ERROR("Invalid parameter");
		return -1;
	}

	// compact(a=tcap:)
	// tcap:1 RTP/AVP
	// tcap:2 RTP/SAVP
	// tcap:3 RTP/SAVPF
	// will be compacted as
	// tcap:1 RTP/AVP RTP/SAVP RTP/SAVPF
	for (i_pcfgs = 0; i_pcfgs < SDP_CAPS_COUNT_MAX; ++i_pcfgs){
		if((*pcfgs)[i_pcfgs].tag <= 0 || (*pcfgs)[i_pcfgs].tcap.tag <= 0){
			break;
		}
		if(!tcap){
			tsk_sprintf(&tcap, "1 %s", _sdp_profile_to_string((*pcfgs)[i_pcfgs].tcap.profile));
		}
		else{
			tsk_strcat_2(&tcap, " %s", _sdp_profile_to_string((*pcfgs)[i_pcfgs].tcap.profile));
		}
	}
	if(tcap){
		_sdp_add_headerA(sdp, "tcap", tcap);
		TSK_FREE(tcap);
	}

	_sdp_acaps_reset(&serialized_acaps);
	i_serialized_acaps = 0;

	for (i_pcfgs = 0; i_pcfgs < SDP_CAPS_COUNT_MAX; ++i_pcfgs){
		if((*pcfgs)[i_pcfgs].tag <= 0){
			break;
		}
		// pcfg: tag
		tsk_strcat_2(&pcfg, "%d", (*pcfgs)[i_pcfgs].tag);
		// pcfg: t=
		if((*pcfgs)[i_pcfgs].tcap.tag > 0){
			tsk_strcat_2(&pcfg, " t=%d", (*pcfgs)[i_pcfgs].tcap.tag);
		}

		// pcfg: a=
		for (i_a_caps = 0; i_a_caps < SDP_CAPS_COUNT_MAX; ++i_a_caps){
			if((*pcfgs)[i_pcfgs].acaps[i_a_caps].tag <= 0){
				break;
			}
			if(i_a_caps == 0){
				tsk_strcat_2(&pcfg, " a=%d", (*pcfgs)[i_pcfgs].acaps[i_a_caps].tag);
			}
			else{
				tsk_strcat_2(&pcfg, "%s%s%d%s", // e.g. |2 or ,6 or ,[2]
						(*pcfgs)[i_pcfgs].acaps[i_a_caps].or ? "|" : ",",
						(*pcfgs)[i_pcfgs].acaps[i_a_caps].optional ? "[" : "",
						(*pcfgs)[i_pcfgs].acaps[i_a_caps].tag,
						(*pcfgs)[i_pcfgs].acaps[i_a_caps].optional ? "]" : ""
					);
			}
			// a=acap:
			if(_sdp_acaps_indexof(&serialized_acaps, (*pcfgs)[i_pcfgs].acaps[i_a_caps].tag) == -1){
				tsk_sprintf(&acap, "%d %s", (*pcfgs)[i_pcfgs].acaps[i_a_caps].tag, (*pcfgs)[i_pcfgs].acaps[i_a_caps].value);
				if(acap){
					_sdp_add_headerA(sdp, "acap", acap);
					TSK_FREE(acap);
					serialized_acaps[i_serialized_acaps++].tag = (*pcfgs)[i_pcfgs].acaps[i_a_caps].tag;
				}
			}
		}

		// a=pcfg:
		if(pcfg){
			_sdp_add_headerA(sdp, "pcfg", pcfg);
			TSK_FREE(pcfg);
		}
	}
	return 0;
}

static int _sdp_pcfg_ensure(sdp_headerM_Or_Message* sdp, const sdp_pcfg_xt* pcfg)
{
	int32_t i, n;
	char field[256];

	if(!sdp || !pcfg || pcfg->tag <=0){
		TSK_DEBUG_ERROR("Invalid parameter");
		return -1;
	}

	if(TSK_OBJECT_HEADER(sdp)->__def__ == tsdp_header_M_def_t && pcfg->tcap.profile != RTP_PROFILE_NONE){
		tsk_strupdate(&((tsdp_header_M_t*)sdp)->proto, _sdp_profile_to_string(pcfg->tcap.profile));
	}

	for(i = 0; i < SDP_CAPS_COUNT_MAX && pcfg->acaps[i].tag > 0; ++i){
		if(sscanf(pcfg->acaps[i].value, "%255s%*s", field) != EOF && (n = tsk_strlen(field)) > 2){
			field[n - 2] = '\0';
			_sdp_add_headerA(sdp, field, &pcfg->acaps[i].value[n + 1/*SPACE*/]);
		}
	}

	return 0;
}

static int _sdp_pcfgs_cat(const sdp_pcfg_xt (*pcfgs_src)[SDP_CAPS_COUNT_MAX], sdp_pcfg_xt (*pcfgs_dst)[SDP_CAPS_COUNT_MAX])
{
	int32_t i, j;
	if(!pcfgs_src || !pcfgs_dst){
		TSK_DEBUG_ERROR("Invalid parameter");
		return -1;
	}

	for(i = 0; i < SDP_CAPS_COUNT_MAX && (*pcfgs_dst)[i].tag > 0; ++i);

	j = 0;
	while (i < SDP_CAPS_COUNT_MAX && j < SDP_CAPS_COUNT_MAX){
		if((*pcfgs_src)[j].tag > 0){
			(*pcfgs_dst)[i++] = (*pcfgs_src)[j++];
		}
		else break;
	}

	return 0;
}





static tsk_object_t* tdav_sdp_caps_ctor(tsk_object_t * self, va_list * app)
{
	tdav_sdp_caps_t *caps = self;
	if(caps){
	}
	return self;
}
static tsk_object_t* tdav_sdp_caps_dtor(tsk_object_t * self)
{ 
	tdav_sdp_caps_t *caps = self;
	if(caps){
	}
	return self;
}
static const tsk_object_def_t tdav_sdp_caps_def_s = 
{
	sizeof(tdav_sdp_caps_t),
	tdav_sdp_caps_ctor, 
	tdav_sdp_caps_dtor,
	tsk_null, 
};

static tdav_sdp_caps_t* tdav_sdp_caps_create()
{
	return tsk_object_new(&tdav_sdp_caps_def_s);
}
