d_rtp.h File Reference

ROHC decompression context for the RTP profile. More...

#include <netinet/ip.h>
#include <netinet/udp.h>
#include <string.h>
#include "d_generic.h"
#include "d_udp.h"
#include "ts_sc_decomp.h"

Include dependency graph for d_rtp.h:

This graph shows which files directly or indirectly include this file:

Go to the source code of this file.

Classes
struct	d_rtp_context
	Define the RTP part of the decompression profile context. More...
Functions
int	rtp_decode_static_rtp (struct d_generic_context *context, const unsigned char *packet, unsigned int length, unsigned char *dest)
	Decode the UDP/RTP static part of the ROHC packet.
int	rtp_decode_dynamic_rtp (struct d_generic_context *context, const unsigned char *packet, unsigned int length, unsigned char *dest)
	Decode the UDP/RTP dynamic part of the ROHC packet.
int	rtp_build_uncompressed_rtp (struct d_generic_context *context, struct d_generic_changes *active, unsigned char *dest, int payload_size)
	Build an uncompressed UDP/RTP header.
int	rtp_get_static_part (void)
	Get the size of the static part of an IR packet.

---

Detailed Description

ROHC decompression context for the RTP profile.

Author:

David Moreau from TAS

Didier Barvaux <didier.barvaux@toulouse.viveris.com>

---

Function Documentation

int rtp_build_uncompressed_rtp	(	struct d_generic_context *	context,
		struct d_generic_changes *	active,
		unsigned char *	dest,
		int	payload_size
	)

Build an uncompressed UDP/RTP header.

Parameters:

context	The generic decompression context
active	The UDP/RTP header changes
dest	The buffer to store the UDP/RTP header (MUST be at least of sizeof(struct udphdr) + sizeof(struct rtphdr) length)
payload_size	The length of the UDP/RTP payload

Returns:

The length of the next header (ie. the UDP/RTP header), -1 in case of error

References d_generic_changes::next_header, rohc_debugf, d_generic_context::specific, and d_rtp_context::udp_checksum_present.

Referenced by d_rtp_create().

int rtp_decode_dynamic_rtp	(	struct d_generic_context *	context,
		const unsigned char *	packet,
		unsigned int	length,
		unsigned char *	dest
	)

Decode the UDP/RTP dynamic part of the ROHC packet.

Parameters:

context	The generic decompression context
packet	The ROHC packet to decode
length	The length of the ROHC packet
dest	The decoded UDP/RTP header

Returns:

The number of bytes read in the ROHC packet, -1 in case of failure

References d_generic_context::active1, d_generic_context::active2, rtphdr::cc, d_add_ts(), d_add_ts_stride(), d_ip_id_init(), d_lsb_init(), d_sdvalue_decode(), d_sdvalue_size(), GET_BIT_0_7, GET_NEXT_16_BITS, d_generic_changes::ip, ip_get_version(), d_generic_context::ip_id1, d_generic_context::ip_id2, IPV4, ipv4_get_id(), rtphdr::m, d_rtp_context::m, d_generic_context::multiple_ip, rtphdr::padding, rtphdr::pt, d_rtp_context::pt, rohc_debugf, RTP_CONST_DYN_PART_SIZE, rtphdr::sn, sn, d_generic_context::sn, d_generic_context::specific, d_rtp_context::timestamp, rtphdr::timestamp, d_rtp_context::ts_received, d_rtp_context::ts_sc, d_rtp_context::udp_checksum_present, and rtphdr::version.

Referenced by d_rtp_create().

int rtp_decode_static_rtp	(	struct d_generic_context *	context,
		const unsigned char *	packet,
		unsigned int	length,
		unsigned char *	dest
	)

Decode the UDP/RTP static part of the ROHC packet.

Parameters:

context	The generic decompression context
packet	The ROHC packet to decode
length	The length of the ROHC packet
dest	The decoded UDP/RTP header

Returns:

The number of bytes read in the ROHC packet, -1 in case of failure

References rohc_debugf, rtphdr::ssrc, and udp_decode_static_udp().

Referenced by d_rtp_create().

int rtp_get_static_part

(

void

)

Get the size of the static part of an IR packet.

Returns:

The size of the static part of an IR packet

Referenced by rtp_detect_ir_size().