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/*
* Copyright (C) 2012 Doubango Telecom <http://www.doubango.org>
*
* Contact: Mamadou Diop <diopmamadou(at)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_sdes_chunck.h"
#include "tnet_endianness.h"
#include "tsk_debug.h"
/*
Each chunk consists of an SSRC/CSRC identifier followed by a list of
zero or more items, which carry information about the SSRC/CSRC.
Each chunk starts on a 32-bit boundary. Each item consists of an 8-
bit type field, an 8-bit octet count describing the length of the
text (thus, not including this two-octet header), and the text
itself. Note that the text can be no longer than 255 octets, but
this is consistent with the need to limit RTCP bandwidth consumption.
+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
| SSRC/CSRC_1 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| SDES items |
| ... |
+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
*/
static tsk_object_t* trtp_rtcp_sdes_chunck_ctor(tsk_object_t * self, va_list * app)
{
trtp_rtcp_sdes_chunck_t *chunck = self;
if(chunck){
chunck->items = tsk_list_create();
}
return self;
}
static tsk_object_t* trtp_rtcp_sdes_chunck_dtor(tsk_object_t * self)
{
trtp_rtcp_sdes_chunck_t *chunck = self;
if(chunck){
TSK_OBJECT_SAFE_FREE(chunck->items);
}
return self;
}
static const tsk_object_def_t trtp_rtcp_sdes_chunck_def_s =
{
sizeof(trtp_rtcp_sdes_chunck_t),
trtp_rtcp_sdes_chunck_ctor,
trtp_rtcp_sdes_chunck_dtor,
tsk_null,
};
const tsk_object_def_t *trtp_rtcp_sdes_chunck_def_t = &trtp_rtcp_sdes_chunck_def_s;
trtp_rtcp_sdes_chunck_t* trtp_rtcp_sdes_chunck_create_null()
{
return tsk_object_new(trtp_rtcp_sdes_chunck_def_t);
}
trtp_rtcp_sdes_chunck_t* trtp_rtcp_sdes_chunck_create(uint32_t ssrc)
{
trtp_rtcp_sdes_chunck_t* chunck;
if((chunck = trtp_rtcp_sdes_chunck_create_null())){
chunck->ssrc = ssrc;
}
return chunck;
}
trtp_rtcp_sdes_chunck_t* trtp_rtcp_sdes_chunck_deserialize(const void* data, tsk_size_t size)
{
trtp_rtcp_sdes_chunck_t* chunck = tsk_null;
const uint8_t* pdata = (uint8_t*)data;
const uint8_t* pend;
if(!data || size < TRTP_RTCP_SDES_CHUNCK_MIN_SIZE){
TSK_DEBUG_ERROR("Invalid parameter");
return tsk_null;
}
pend = (pdata + size);
if((chunck = trtp_rtcp_sdes_chunck_create_null())){
trtp_rtcp_sdes_item_t* item;
tsk_bool_t is_last_item = tsk_false;
// SSRC/CSRC
chunck->ssrc = (uint32_t)tnet_ntohl_2(pdata);
pdata += TRTP_RTCP_SDES_CHUNCK_SSRC_OR_CSRC_SIZE;
while((pdata < pend) && !is_last_item){
if((item = trtp_rtcp_sdes_item_deserialize(pdata, (pend-pdata)))){
is_last_item = (item->type == trtp_rtcp_sdes_item_type_end);
pdata += trtp_rtcp_sdes_item_get_size(item);
tsk_list_push_back_data(chunck->items, (void**)&item);
}
else{
TSK_DEBUG_ERROR("Failed to deserialize sdes item");
break;
}
}
}
else{
TSK_DEBUG_ERROR("Failed to create new sdes_chunck object");
return tsk_null;
}
return chunck;
}
int trtp_rtcp_sdes_chunck_serialize_to(const trtp_rtcp_sdes_chunck_t* self, void* data, tsk_size_t size)
{
uint8_t* pdata = (uint8_t*)data;
const tsk_list_item_t* item;
const trtp_rtcp_sdes_item_t* sdes_item;
tsk_size_t sdes_item_size;
int ret = 0;
if(!self || !data || size < trtp_rtcp_sdes_chunck_get_size(self)){
TSK_DEBUG_ERROR("Invalid parameter");
return -1;
}
pdata[0] = self->ssrc >> 24;
pdata[1] = (self->ssrc >> 16) & 0xFF;
pdata[2] = (self->ssrc >> 8) & 0xFF;
pdata[3] = (self->ssrc & 0xFF);
pdata += 4;
tsk_list_foreach(item, self->items){
if(!(sdes_item = TRTP_RTCP_SDES_ITEM(item->data))){
continue;
}
if((ret = trtp_rtcp_sdes_item_serialize_to(sdes_item, pdata, size))){
TSK_DEBUG_ERROR("SDES item serialization failed");
goto bail;
}
sdes_item_size = trtp_rtcp_sdes_item_get_size(sdes_item);
pdata += sdes_item_size; size -= sdes_item_size;
}
bail:
return ret;
}
int trtp_rtcp_sdes_chunck_add_item(trtp_rtcp_sdes_chunck_t* self, trtp_rtcp_sdes_item_type_t type, const void* data, uint8_t length)
{
trtp_rtcp_sdes_item_t *item;
if(!self || !self->items){
TSK_DEBUG_ERROR("Invalid parameter");
return -1;
}
if((item = trtp_rtcp_sdes_item_create(type, data, length))){
tsk_list_push_back_data(self->items, (void**)&item);
}
return 0;
}
tsk_size_t trtp_rtcp_sdes_chunck_get_size(const trtp_rtcp_sdes_chunck_t* self)
{
const tsk_list_item_t* item;
if(!self){
TSK_DEBUG_ERROR("Invalid parameter");
return 0;
}
else{
tsk_size_t size = TRTP_RTCP_SDES_CHUNCK_SSRC_OR_CSRC_SIZE;
tsk_list_foreach(item, self->items){
size += trtp_rtcp_sdes_item_get_size(TRTP_RTCP_SDES_ITEM(item->data));
}
if(size & 0x03){//Each chunk starts on a 32-bit boundary
size += (4 - (size & 0x03));
}
return size;
}
}
|
