Scaled RTP Timestamp encoding. More...

#include "ts_sc_comp.h"
#include "sdvl.h"
#include "rohc_traces.h"
#include <stdlib.h>
#include <assert.h>

Include dependency graph for ts_sc_comp.c:

Functions
int	c_create_sc (struct ts_sc_comp *const ts_sc, const size_t wlsb_window_width)
	Create the ts_sc_comp object.
void	c_destroy_sc (struct ts_sc_comp *const ts_sc)
	Destroy the ts_sc_comp object.
void	c_add_ts (struct ts_sc_comp *const ts_sc, const uint32_t ts, const uint16_t sn)
	Store the new TS, calculate new values and update the state.
bool	nb_bits_scaled (const struct ts_sc_comp ts_sc, size_t *const bits_nr)
	Return the number of bits needed to encode TS_SCALED.
void	add_scaled (const struct ts_sc_comp *const ts_sc, uint16_t sn)
	Add a new TS_SCALED value to the ts_sc_comp object.
uint32_t	get_ts_stride (const struct ts_sc_comp ts_sc)
	Return the TS_STRIDE value.
uint32_t	get_ts_scaled (const struct ts_sc_comp ts_sc)
	Return the TS_SCALED value.

Detailed Description

Scaled RTP Timestamp encoding.

Author:: David Moreau from TAS; Didier Barvaux <didier.barvaux@toulouse.viveris.com>; Didier Barvaux <didier@barvaux.org>

Function Documentation

void add_scaled	(	const struct ts_sc_comp *const	ts_sc,
		uint16_t	sn
	)

Add a new TS_SCALED value to the ts_sc_comp object.

Parameters:

ts_sc	The ts_sc_comp object
sn	The Sequence Number

References c_add_wlsb(), ts_sc_comp::scaled_window, and ts_sc_comp::ts_scaled.

void c_add_ts	(	struct ts_sc_comp *const	ts_sc,
		const uint32_t	ts,
		const uint16_t	sn
	)

Store the new TS, calculate new values and update the state.

Parameters:

ts_sc	The ts_sc_comp object
ts	The timestamp to add
sn	The sequence number of the RTP packet

References INIT_STRIDE, INIT_TS, ts_sc_comp::is_deductible, ts_sc_comp::nr_init_stride_packets, ts_sc_comp::old_sn, ts_sc_comp::old_ts, rohc_debugf, sdvl_can_value_be_encoded(), SEND_SCALED, sn, ts_sc_comp::sn, ts_sc_comp::state, ts_sc_decomp::ts, ts_sc_comp::ts, ts_sc_comp::ts_delta, ts_sc_comp::ts_offset, ts_sc_comp::ts_scaled, and ts_sc_comp::ts_stride.

int c_create_sc	(	struct ts_sc_comp *const	ts_sc,
		const size_t	wlsb_window_width
	)

Create the ts_sc_comp object.

Parameters:

ts_sc	The ts_sc_comp object to create
wlsb_window_width	The width of the W-LSB sliding window to use for TS_STRIDE (must be > 0)

Returns:: 1 if creation is successful, 0 otherwise

References c_create_wlsb(), INIT_TS, ts_sc_comp::is_deductible, ts_sc_comp::nr_init_stride_packets, ts_sc_comp::old_sn, ts_sc_comp::old_ts, rohc_debugf, ROHC_LSB_SHIFT_RTP_TS, ts_sc_comp::scaled_window, ts_sc_comp::sn, ts_sc_comp::state, ts_sc_comp::ts, ts_sc_comp::ts_delta, ts_sc_comp::ts_offset, ts_sc_comp::ts_scaled, and ts_sc_comp::ts_stride.

Referenced by c_rtp_create().

void c_destroy_sc ( struct ts_sc_comp *const ts_sc )

Destroy the ts_sc_comp object.

Parameters:

ts_sc The ts_sc_comp object to destroy

References c_destroy_wlsb(), and ts_sc_comp::scaled_window.

Referenced by c_rtp_destroy().

uint32_t get_ts_scaled ( const struct ts_sc_comp ts_sc )

Return the TS_SCALED value.

Parameters:

ts_sc The ts_sc_comp object

Returns:: The TS_SCALED value

References ts_sc_comp::ts_scaled.

uint32_t get_ts_stride ( const struct ts_sc_comp ts_sc )

Return the TS_STRIDE value.

Parameters:

ts_sc The ts_sc_comp object

Returns:: TS_STRIDE value

References ts_sc_comp::ts_stride.

Referenced by rtp_code_dynamic_rtp_part(), and rtp_header_flags_and_fields().

bool nb_bits_scaled	(	const struct ts_sc_comp	ts_sc,
		size_t *const	bits_nr
	)

Return the number of bits needed to encode TS_SCALED.

Parameters:

ts_sc	The ts_sc_comp object
bits_nr	OUT: The number of bits needed

Returns:: true in case of success, false if the minimal number of bits can not be found

References ts_sc_comp::is_deductible, ts_sc_comp::scaled_window, ts_sc_comp::ts_scaled, and wlsb_get_k_32bits().

Functions

Detailed Description

Function Documentation