diff options
Diffstat (limited to 'tinyRTP/src/rtp/trtp_rtp_packet.c')
| -rw-r--r-- | tinyRTP/src/rtp/trtp_rtp_packet.c | 194 |
1 files changed, 194 insertions, 0 deletions
diff --git a/tinyRTP/src/rtp/trtp_rtp_packet.c b/tinyRTP/src/rtp/trtp_rtp_packet.c new file mode 100644 index 0000000..2f2fcb4 --- /dev/null +++ b/tinyRTP/src/rtp/trtp_rtp_packet.c @@ -0,0 +1,194 @@ +/*
+* Copyright (C) 2009-2010 Mamadou Diop.
+*
+* 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.
+*
+*/
+/**@file trtp_rtp_packet.c
+ * @brief RTP packet.
+ *
+ * @author Mamadou Diop <diopmamadou(at)doubango.org>
+ *
+ * @date Created: Sat Nov 8 16:54:58 2009 mdiop
+ */
+#include "tinyrtp/rtp/trtp_rtp_packet.h"
+
+#include "tnet_endianness.h"
+
+#include "tsk_memory.h"
+#include "tsk_debug.h"
+
+#include <string.h> /* memcpy() */
+
+/** Create new RTP packet */
+trtp_rtp_packet_t* trtp_rtp_packet_create_null()
+{
+ return tsk_object_new(trtp_rtp_packet_def_t);
+}
+
+trtp_rtp_packet_t* trtp_rtp_packet_create(uint32_t ssrc, uint16_t seq_num, uint32_t timestamp, uint8_t payload_type, tsk_bool_t marker)
+{
+ trtp_rtp_packet_t* packet;
+ if((packet = tsk_object_new(trtp_rtp_packet_def_t))){
+ packet->header = trtp_rtp_header_create(ssrc, seq_num, timestamp, payload_type, marker);
+ }
+ return packet;
+}
+
+/** Serialize rtp packet object into binary buffer */
+tsk_buffer_t* trtp_rtp_packet_serialize(const trtp_rtp_packet_t *self)
+{
+ tsk_buffer_t* buffer = tsk_null;
+
+ if(!self || !self->header){
+ TSK_DEBUG_ERROR("Invalid parameter");
+ return tsk_null;
+ }
+
+ if(!(buffer = trtp_rtp_header_serialize(self->header))){
+ TSK_DEBUG_ERROR("Failed to serialize the RTP header");
+ return tsk_null;
+ }
+ else{
+ /* extension */
+ if(self->extension.data && self->extension.size && self->header->extension){
+ tsk_buffer_append(buffer, self->extension.data, self->extension.size);
+ }
+ /* append payload */
+ tsk_buffer_append(buffer, self->payload.data_const ? self->payload.data_const : self->payload.data, self->payload.size);
+ }
+
+ return buffer;
+}
+
+/** Deserialize rtp packet object from binary buffer */
+trtp_rtp_packet_t* trtp_rtp_packet_deserialize(const void *data, tsk_size_t size)
+{
+ trtp_rtp_packet_t* packet = tsk_null;
+ trtp_rtp_header_t *header;
+ tsk_size_t payload_size;
+ const uint8_t* pdata = data;
+
+ if(!data){
+ TSK_DEBUG_ERROR("Invalid parameter");
+ return tsk_null;
+ }
+
+ if(size< TRTP_RTP_HEADER_MIN_SIZE){
+ TSK_DEBUG_ERROR("Too short to contain RTP message");
+ return tsk_null;
+ }
+
+ /* deserialize the RTP header (the packet itsel will be deserialized only if the header deserialization succeed) */
+ if(!(header = trtp_rtp_header_deserialize(data, size))){
+ TSK_DEBUG_ERROR("Failed to deserialize RTP header");
+ return tsk_null;
+ }
+ else{
+ /* create the packet */
+ if(!(packet = trtp_rtp_packet_create_null())){
+ TSK_DEBUG_ERROR("Failed to create new RTP packet");
+ TSK_OBJECT_SAFE_FREE(header);
+ return tsk_null;
+ }
+ /* set the header */
+ packet->header = header,
+ header = tsk_null;
+
+ /* do not need to check overflow (have been done by trtp_rtp_header_deserialize()) */
+ payload_size = (size - TRTP_RTP_HEADER_MIN_SIZE - (packet->header->csrc_count * 4));
+ pdata = ((const uint8_t*)data) + (size - payload_size);
+
+ /* RFC 3550 - 5.3.1 RTP Header Extension
+ If the X bit in the RTP header is one, a variable-length header
+ extension MUST be appended to the RTP header, following the CSRC list
+ if present. The header extension contains a 16-bit length field that
+ counts the number of 32-bit words in the extension, excluding the
+ four-octet extension header (therefore zero is a valid length). Only
+ a single extension can be appended to the RTP data header.
+ 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
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | defined by profile | length |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | header extension |
+ | .... |
+ */
+ if(packet->header->extension && payload_size>=4 /* extension min-size */){
+ pdata += 2; /* skip "defined by profile" field */
+ packet->extension.size = 4 /* first two 16-bit fields */ + (tnet_ntohs(*((uint16_t*)pdata)) * 4/*words(32-bit)*/);
+ pdata += 2; /* skip "length" field */
+ if((packet->extension.data = tsk_calloc(packet->extension.size, sizeof(uint8_t)))){
+ memcpy(packet->extension.data, (pdata - 4), packet->extension.size);
+ }
+ payload_size -= packet->extension.size;
+ }
+
+ packet->payload.size = payload_size;
+ if(payload_size && (packet->payload.data = tsk_calloc(packet->payload.size, sizeof(uint8_t)))){
+ memcpy(packet->payload.data, pdata, packet->payload.size);
+ }
+ else{
+ TSK_DEBUG_ERROR("Failed to allocate new buffer");
+ packet->payload.size = 0;
+ }
+ }
+
+ return packet;
+}
+
+
+
+
+
+
+
+
+
+//=================================================================================================
+// RTP packet object definition
+//
+static tsk_object_t* trtp_rtp_packet_ctor(tsk_object_t * self, va_list * app)
+{
+ trtp_rtp_packet_t *packet = self;
+ if(packet){
+ }
+ return self;
+}
+
+static tsk_object_t* trtp_rtp_packet_dtor(tsk_object_t * self)
+{
+ trtp_rtp_packet_t *packet = self;
+ if(packet){
+ TSK_OBJECT_SAFE_FREE(packet->header);
+ TSK_FREE(packet->payload.data);
+ TSK_FREE(packet->extension.data);
+ packet->payload.data_const = tsk_null;
+ }
+
+ return self;
+}
+
+static const tsk_object_def_t trtp_rtp_packet_def_s =
+{
+ sizeof(trtp_rtp_packet_t),
+ trtp_rtp_packet_ctor,
+ trtp_rtp_packet_dtor,
+ tsk_null,
+};
+const tsk_object_def_t *trtp_rtp_packet_def_t = &trtp_rtp_packet_def_s;
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