diff options
Diffstat (limited to 'tinyRTP/src/rtp/trtp_rtp_header.c')
| -rw-r--r-- | tinyRTP/src/rtp/trtp_rtp_header.c | 224 |
1 files changed, 224 insertions, 0 deletions
diff --git a/tinyRTP/src/rtp/trtp_rtp_header.c b/tinyRTP/src/rtp/trtp_rtp_header.c new file mode 100644 index 0000000..65fffe3 --- /dev/null +++ b/tinyRTP/src/rtp/trtp_rtp_header.c @@ -0,0 +1,224 @@ +/*
+* 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_header.c
+ * @brief RTP header.
+ *
+ * @author Mamadou Diop <diopmamadou(at)doubango.org>
+ *
+ * @date Created: Sat Nov 8 16:54:58 2009 mdiop
+ */
+#include "tinyrtp/rtp/trtp_rtp_header.h"
+
+#include "tnet_endianness.h"
+
+#include "tsk_memory.h"
+#include "tsk_debug.h"
+
+ /* RFC 3550 section 5.1 - RTP Fixed Header Fields
+ 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
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ |V=2|P|X| CC |M| PT | sequence number |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | timestamp |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | synchronization source (SSRC) identifier |
+ +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
+ | contributing source (CSRC) identifiers |
+ | .... |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+
+/* Create new RTP header */
+trtp_rtp_header_t* trtp_rtp_header_create_null()
+{
+ return tsk_object_new(trtp_rtp_header_def_t);
+}
+
+trtp_rtp_header_t* trtp_rtp_header_create(uint32_t ssrc, uint16_t seq_num, uint32_t timestamp, uint8_t payload_type, tsk_bool_t marker)
+{
+ trtp_rtp_header_t* header;
+ if((header = tsk_object_new(trtp_rtp_header_def_t))){
+ header->version = TRTP_RTP_VERSION;
+ header->marker = marker ? 1 : 0;
+ header->payload_type = payload_type;
+ header->seq_num = seq_num;
+ header->timestamp = timestamp;
+ header->ssrc = ssrc;
+ }
+ return header;
+}
+
+/** Serialize rtp header object into binary buffer */
+tsk_buffer_t* trtp_rtp_header_serialize(const trtp_rtp_header_t *self)
+{
+ tsk_buffer_t* buffer;
+ uint8_t* data;
+ tsk_size_t i;
+
+ if(!self){
+ TSK_DEBUG_ERROR("Invalid parameter");
+ return tsk_null;
+ }
+
+ if(!(data = tsk_calloc(TRTP_RTP_HEADER_MIN_SIZE + (4 * self->csrc_count), 1))){
+ TSK_DEBUG_ERROR("Failed to allocate buffer");
+ return tsk_null;
+ }
+
+ /* Octet-0: version(2), Padding(1), Extension(1), CSRC Count(4) */
+ data[0] = (((uint8_t)self->version)<< 6) |
+ (((uint8_t)self->padding)<< 5) |
+ (((uint8_t)self->extension)<< 4) |
+ ((uint8_t)self->csrc_count);
+ /* Octet-1: Marker(1), Payload Type(7) */
+ data[1] = (((uint8_t)self->marker)<< 7) |
+ ((uint8_t)self->payload_type);
+ /* Octet-2-3: Sequence number (16) */
+ *((uint16_t*)&data[2]) = tnet_htons(self->seq_num);
+ /* Octet-4-5-6-7: timestamp (32) */
+ *((uint32_t*)&data[4]) = tnet_htonl(self->timestamp);
+ /* Octet-8-9-10-11: SSRC (32) */
+ *((uint32_t*)&data[8]) = tnet_htonl(self->ssrc);
+
+ /* Octet-12-13-14-15-****: CSRC */
+ for(i=0; i<self->csrc_count; i++){
+ *((uint32_t*)&data[12+i]) = tnet_htonl(self->csrc[i]);
+ }
+
+ if(!(buffer = tsk_buffer_create_null())){
+ TSK_DEBUG_ERROR("Failed to create new buffer");
+ TSK_FREE(data);
+ return tsk_null;
+ }
+ else{
+ tsk_buffer_takeownership(buffer, (void**)&data, TRTP_RTP_HEADER_MIN_SIZE + (4 * self->csrc_count));
+ }
+
+ return buffer;
+}
+
+/** Deserialize rtp header object from binary buffer */
+trtp_rtp_header_t* trtp_rtp_header_deserialize(const void *data, tsk_size_t size)
+{
+ trtp_rtp_header_t* header = tsk_null;
+ const uint8_t* pdata = (const uint8_t*)data;
+ uint8_t csrc_count, i;
+
+ 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 header");
+ return tsk_null;
+ }
+
+ /* Before starting to deserialize, get the "csrc_count" and check the length validity
+ * CSRC count (4 last bits)
+ */
+ csrc_count = (*pdata & 0x0F);
+ if(size <(tsk_size_t)TRTP_RTP_HEADER_MIN_SIZE + (4 * csrc_count)){
+ TSK_DEBUG_ERROR("Too short to contain RTP header");
+ return tsk_null;
+ }
+
+ if(!(header = trtp_rtp_header_create_null())){
+ TSK_DEBUG_ERROR("Failed to create new RTP header");
+ return tsk_null;
+ }
+
+ /* version (2bits) */
+ header->version = (*pdata >> 6);
+ /* Padding (1bit) */
+ header->padding = ((*pdata >>5) & 0x01);
+ /* Extension (1bit) */
+ header->extension = ((*pdata >>4) & 0x01);
+ /* CSRC Count (4bits) */
+ header->csrc_count = csrc_count;
+ // skip octet
+ ++pdata;
+
+ /* Marker (1bit) */
+ header->marker = (*pdata >> 7);
+ /* Payload Type (7bits) */
+ header->payload_type = (*pdata & 0x7F);
+ // skip octet
+ ++pdata;
+
+ /* Sequence Number (16bits) */
+ header->seq_num = tnet_ntohs(*((uint16_t*)pdata));
+ // skip octets
+ pdata += 2;
+
+ /* timestamp (32bits) */
+ header->timestamp = tnet_ntohl(*((uint32_t*)pdata));
+ // skip octets
+ pdata += 4;
+
+ /* synchronization source (SSRC) identifier (32bits) */
+ header->ssrc = tnet_ntohl(*((uint32_t*)pdata));
+ // skip octets
+ pdata += 4;
+
+ /* contributing source (CSRC) identifiers */
+ for(i=0; i<csrc_count; i++, pdata += 4){
+ header->csrc[i] = tnet_ntohl(*((uint32_t*)pdata));
+ }
+
+ return header;
+}
+
+
+
+
+
+
+//=================================================================================================
+// RTP header object definition
+//
+static tsk_object_t* trtp_rtp_header_ctor(tsk_object_t * self, va_list * app)
+{
+ trtp_rtp_header_t *header = self;
+ if(header){
+ }
+ return self;
+}
+
+static tsk_object_t* trtp_rtp_header_dtor(tsk_object_t * self)
+{
+ trtp_rtp_header_t *header = self;
+ if(header){
+ }
+
+ return self;
+}
+
+static const tsk_object_def_t trtp_rtp_header_def_s =
+{
+ sizeof(trtp_rtp_header_t),
+ trtp_rtp_header_ctor,
+ trtp_rtp_header_dtor,
+ tsk_null,
+};
+const tsk_object_def_t *trtp_rtp_header_def_t = &trtp_rtp_header_def_s;
\ No newline at end of file |
