d_rtp.c File Reference

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

#include "d_rtp.h"
#include "rohc_traces_internal.h"
#include "rohc_bit_ops.h"
#include "rohc_debug.h"
#include "rohc_utils.h"
#include "ts_sc_decomp.h"
#include "sdvl.h"
#include "crc.h"
#include "decode.h"
#include "rohc_decomp_internals.h"
#include "protocols/udp.h"
#include "protocols/rtp.h"
#include <assert.h>

Include dependency graph for d_rtp.c:

Defines
#define	RTP_CONST_DYN_PART_SIZE   9
	The size (in bytes) of the constant RTP dynamic part.
Functions
void *	d_rtp_create (const struct d_context *const context)
	Create the RTP decompression context.
Variables
struct d_profile	d_rtp_profile
	Define the decompression part of the RTP profile as described in the RFC 3095.

---

Detailed Description

ROHC decompression context for the RTP profile.

Author:

David Moreau from TAS

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

Didier Barvaux <didier@barvaux.org>

---

Define Documentation

#define RTP_CONST_DYN_PART_SIZE   9

The size (in bytes) of the constant RTP dynamic part.

According to RFC3095 section 5.7.7.6: 1 (flags V, P, RX, CC) + 1 (flags M, PT) + 2 (RTP SN) + 4 (RTP TS) + 1 (CSRC list) = 9 bytes

The size of the Generic CSRC list field is considered constant because generic CSRC list is not supported yet and thus 1 byte of zero is used.

---

Function Documentation

void* d_rtp_create

(

const struct d_context *const

context

)

Create the RTP decompression context.

This function is one of the functions that must exist in one profile for the framework to work.

Returns:

The newly-created RTP decompression context

References d_generic_context::build_next_header, d_generic_context::compute_crc_dynamic, d_generic_context::compute_crc_static, d_create_sc(), d_generic_create(), d_generic_destroy(), d_generic_context::decode_values_from_bits, d_context::decompressor, d_generic_context::detect_packet_type, d_profile::id, d_generic_context::inner_ip_changes, d_generic_changes::next_header, d_generic_changes::next_header_len, d_generic_context::next_header_len, d_generic_context::next_header_proto, d_generic_context::outer_ip_changes, d_generic_context::parse_dyn_next_hdr, d_generic_context::parse_static_next_hdr, d_generic_context::parse_uo_remainder, d_context::profile, rohc_error, ROHC_IPPROTO_UDP, rohc_lsb_free(), rohc_lsb_new(), ROHC_LSB_SHIFT_RTP_SN, ROHC_TRACE_DECOMP, rtp_compute_crc_dynamic(), rtp_compute_crc_static(), d_generic_context::sn_lsb_ctxt, d_generic_context::specific, rohc_decomp::trace_callback, d_rtp_context::ts_scaled_ctxt, d_rtp_context::udp_checksum_present, d_generic_context::update_context, and zfree.

---

Variable Documentation

struct d_profile d_rtp_profile

Initial value:

{
        ROHC_PROFILE_RTP,       
        "RTP / Decompressor",   
        d_generic_decode,       
        d_rtp_create,
        d_rtp_destroy,
        d_generic_get_sn,
}

Define the decompression part of the RTP profile as described in the RFC 3095.