doubango/tinyRTP/src/rtcp/trtp_rtcp_header.c
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 #if HAVE_CRT
 #define _CRTDBG_MAP_ALLOC 
 #include <stdlib.h> 
 #include <crtdbg.h>
 #endif //HAVE_CRT
 /*
74ca6d11
 * Copyright (C) 2020, University of the Basque Country (UPV/EHU)
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 * Contact for licensing options: <licensing-mcpttclient(at)mcopenplatform(dot)com>
 *
 * The original file was part of Open Source Doubango Framework
 * Copyright (C) 2010-2011 Mamadou Diop.
 * Copyright (C) 2012 Doubango Telecom <http://doubango.org>
 *
 * 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.
 *
 */
 #include "tinyrtp/rtcp/trtp_rtcp_header.h"
 
 #include "tnet_endianness.h"
 
 #include "tsk_memory.h"
 #include "tsk_debug.h"
 /*
         0                   1                   2                   3
         0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
        +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 header |V=2|P|    RC   |   PT=SR=200   |             length            |
        +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 */
 
 trtp_rtcp_header_t* trtp_rtcp_header_create_null()
 {
 	return tsk_object_new(trtp_rtcp_header_def_t);
 }
 
 trtp_rtcp_header_t* trtp_rtcp_header_create(uint8_t version, uint8_t padding, uint8_t rc, trtp_rtcp_packet_type_t type, uint16_t length_in_bytes)
 {
 	trtp_rtcp_header_t* header;
 	if((header = trtp_rtcp_header_create_null())){
 		header->version = version;
 		header->padding = padding;
 		header->rc = rc;
 		header->type = type;
 		header->length_in_words_minus1 = ((length_in_bytes >> 2) - 1);
 		header->length_in_bytes = length_in_bytes;
 	}
 
 	return header;
 }
 
 int trtp_rtcp_header_serialize_to(const trtp_rtcp_header_t *self, void* data, tsk_size_t size)
 {
 	uint8_t* pdata = (uint8_t*)data;
 	if(!self || !data || size < TRTP_RTCP_HEADER_SIZE){
 		TSK_DEBUG_ERROR("Invalid parameter");
 		return -1;
 	}
 	// Octet-0: version(2), Padding(1), RC(5)
 	pdata[0] = ((uint8_t)self->version)<<6 |
 		((uint8_t)self->padding)<<5 |
 		((uint8_t)self->rc);
 	// Octet-1: PT(8)
 	pdata[1] = self->type;
 	// Octet-2 and Octet3: length (16)
 	pdata[2] = self->length_in_words_minus1 >> 8;
 	pdata[3] = self->length_in_words_minus1 & 0xFF;
 	return 0;
 }
 
 trtp_rtcp_header_t* trtp_rtcp_header_deserialize(const void *data, tsk_size_t size)
 {
 	trtp_rtcp_header_t* header = tsk_null;
 	if(trtp_rtcp_header_deserialize_to(&header, data, size) != 0){
 		TSK_DEBUG_ERROR("Failed to deserialize the rtcp header");
 		TSK_OBJECT_SAFE_FREE(header);
 	}
 	return header;
 }
 
 int trtp_rtcp_header_deserialize_to(trtp_rtcp_header_t** self, const void *data, tsk_size_t size)
 {
 	const uint8_t* pdata = (uint8_t*)data;
 	if(!self || !data || size < TRTP_RTCP_HEADER_SIZE){
 		TSK_DEBUG_ERROR("Invalid parameter");
 		return -1;
 	}
 	
 	if(!*self && !(*self = trtp_rtcp_header_create_null())){
 		TSK_DEBUG_ERROR("Failed to create new rtcp header");
 		return -3;
 	}
 	(*self)->version = pdata[0] >> 6;
 	(*self)->padding = (pdata[0] >> 5) & 0x01;
 	(*self)->rc = (pdata[0] & 0x1f);
 	(*self)->type = (enum trtp_rtcp_packet_type_e)pdata[1];
 	(*self)->length_in_words_minus1 = tnet_ntohs_2(&pdata[2]);
 	(*self)->length_in_bytes = ((*self)->length_in_words_minus1 + 1) << 2;
 
 	return 0;
 }
 
 //=================================================================================================
 //	RTCP header object definition
 //
 static tsk_object_t* trtp_rtcp_header_ctor(tsk_object_t * self, va_list * app)
 {
 	trtp_rtcp_header_t *header = self;
 	if(header){
 	}
 	return self;
 }
 
 static tsk_object_t* trtp_rtcp_header_dtor(tsk_object_t * self)
 { 
 	trtp_rtcp_header_t *header = self;
 	if(header){
 	}
 
 	return self;
 }
 
 static const tsk_object_def_t trtp_rtcp_header_def_s = 
 {
 	sizeof(trtp_rtcp_header_t),
 	trtp_rtcp_header_ctor, 
 	trtp_rtcp_header_dtor,
 	tsk_null, 
 };
 const tsk_object_def_t *trtp_rtcp_header_def_t = &trtp_rtcp_header_def_s;