Scaled RTP Timestamp decoding. More...

#include "lsb_decode.h"
#include "dllexport.h"
#include <stdint.h>
#include <stdbool.h>

Include dependency graph for ts_sc_decomp.h:

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

Functions
struct ts_sc_decomp *ROHC_EXPORT	d_create_sc (void)
	Create the scaled RTP Timestamp decoding context.
void ROHC_EXPORT	rohc_ts_scaled_free (struct ts_sc_decomp *const ts_scaled) __attribute__((nonnull(1)))
	Destroy the given ts_sc_decomp object.
void ROHC_EXPORT	ts_update_context (struct ts_sc_decomp *const ts_sc, const uint32_t ts, const uint16_t sn)
	Store a new timestamp.
void ROHC_EXPORT	d_record_ts_stride (struct ts_sc_decomp *const ts_sc, const uint32_t ts_stride)
	Store the newly-parsed TS_STRIDE value.
bool ROHC_EXPORT	ts_decode_scaled (struct ts_sc_decomp const ts_sc, const uint32_t ts_scaled, const size_t bits_nr, uint32_t const decoded_ts)
	Decode timestamp (TS) value with TS_SCALED value.
uint32_t ROHC_EXPORT	ts_decode_unscaled (struct ts_sc_decomp *const ts_sc, const uint32_t ts_bits)
	Decode timestamp (TS) value with unscaled value.
uint32_t ROHC_EXPORT	ts_deduce_from_sn (struct ts_sc_decomp *const ts_sc, const uint16_t sn)
	Deduct timestamp (TS) from Sequence Number (SN)

Detailed Description

Scaled RTP Timestamp decoding.

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

Function Documentation

struct ts_sc_decomp* ROHC_EXPORT d_create_sc ( void ) [read]

Create the scaled RTP Timestamp decoding context.

Returns:: The scaled RTP Timestamp decoding context in case of success, NULL otherwise

References ts_sc_decomp::lsb_ts_scaled, ts_sc_decomp::new_ts_offset, ts_sc_decomp::new_ts_scaled, ts_sc_decomp::new_ts_stride, ts_sc_decomp::old_sn, ts_sc_decomp::old_ts, rohc_lsb_new(), ROHC_LSB_SHIFT_RTP_TS, ts_sc_decomp::sn, ts_sc_decomp::ts, ts_sc_decomp::ts_offset, ts_sc_decomp::ts_scaled, and ts_sc_decomp::ts_stride.

Referenced by d_rtp_create().

void ROHC_EXPORT d_record_ts_stride	(	struct ts_sc_decomp *const	ts_sc,
		const uint32_t	ts_stride
	)

Store the newly-parsed TS_STRIDE value.

Parameters:

ts_sc	The ts_sc_decomp object
ts_stride	The TS_STRIDE value to add

References ts_sc_decomp::new_ts_stride, rohc_debugf, and ts_sc_decomp::ts_stride.

void ROHC_EXPORT rohc_ts_scaled_free ( struct ts_sc_decomp *const ts_sc )

Destroy the given ts_sc_decomp object.

Parameters:

ts_sc The ts_sc_decomp object to destroy

References ts_sc_decomp::lsb_ts_scaled, and rohc_lsb_free().

bool ROHC_EXPORT ts_decode_scaled	(	struct ts_sc_decomp *const	ts_sc,
		const uint32_t	ts_scaled,
		const size_t	bits_nr,
		uint32_t *const	decoded_ts
	)

Decode timestamp (TS) value with TS_SCALED value.

Use the given TS and TS_SCALED bits. Use the TS_STRIDE and TS_OFFSET values found in context.

Parameters:

ts_sc	The ts_sc_decomp object
ts_scaled	The W-LSB-encoded TS_SCALED value
bits_nr	The number of bits of TS_SCALED (W-LSB)
decoded_ts	OUT: The decoded TS

Returns:: true in case of success, false otherwise

References ts_sc_decomp::lsb_ts_scaled, ts_sc_decomp::new_ts_offset, ts_sc_decomp::new_ts_scaled, ts_sc_decomp::new_ts_stride, rohc_debugf, rohc_lsb_decode32(), rohc_lsb_get_ref(), ts_sc_decomp::ts_offset, and ts_sc_decomp::ts_stride.

uint32_t ROHC_EXPORT ts_decode_unscaled	(	struct ts_sc_decomp *const	ts_sc,
		const uint32_t	ts_bits
	)

Decode timestamp (TS) value with unscaled value.

Use the given unscaled TS bits. If the TS_STRIDE value was updated by the current packet, compute new TS_SCALED and TS_OFFSET values from the new TS_STRIDE value.

Parameters:

ts_sc	The ts_sc_decomp object
ts_bits	The unscaled TS bits

Returns:: The decoded TS

References ts_sc_decomp::new_ts_offset, ts_sc_decomp::new_ts_scaled, ts_sc_decomp::new_ts_stride, rohc_debugf, and ts_sc_decomp::ts_stride.

uint32_t ROHC_EXPORT ts_deduce_from_sn	(	struct ts_sc_decomp *const	ts_sc,
		const uint16_t	sn
	)

Deduct timestamp (TS) from Sequence Number (SN)

Use the given SN bits to compute the new TS_SCALED value. Use the TS_STRIDE and TS_OFFSET values found in context.

Parameters:

ts_sc	The ts_sc_decomp object
sn	The SN

Returns:: The decoded TS

References ts_sc_decomp::new_ts_offset, ts_sc_decomp::new_ts_scaled, ts_sc_decomp::new_ts_stride, rohc_debugf, ts_sc_decomp::sn, ts_sc_decomp::ts_offset, ts_sc_decomp::ts_scaled, and ts_sc_decomp::ts_stride.

void ROHC_EXPORT ts_update_context	(	struct ts_sc_decomp *const	ts_sc,
		const uint32_t	ts,
		const uint16_t	sn
	)

Store a new timestamp.

Parameters:

ts_sc	The ts_sc_decomp object
ts	The new decoded TimeStamp (TS)
sn	The new decoded Sequence Number (SN)

References ts_sc_decomp::lsb_ts_scaled, ts_sc_decomp::new_ts_offset, ts_sc_decomp::new_ts_scaled, ts_sc_decomp::new_ts_stride, ts_sc_decomp::old_sn, ts_sc_decomp::old_ts, rohc_debugf, rohc_lsb_set_ref(), sn, ts_sc_decomp::sn, ts_sc_decomp::ts, ts_sc_decomp::ts_offset, ts_sc_decomp::ts_scaled, and ts_sc_decomp::ts_stride.

Functions

Detailed Description

Function Documentation