ts_sc_decomp.c File Reference

Scaled RTP Timestamp decoding. More...

#include "ts_sc_decomp.h"
#include "rohc_traces.h"

Include dependency graph for ts_sc_decomp.c:

Data Structures
struct	ts_sc_decomp
	The scaled RTP Timestamp decoding context. More...
Functions
struct ts_sc_decomp *	d_create_sc (void)
	Create the scaled RTP Timestamp decoding context.
void	rohc_ts_scaled_free (struct ts_sc_decomp *const ts_sc)
	Destroy the given ts_sc_decomp object.
void	ts_update_context (struct ts_sc_decomp *const ts_sc, const uint32_t ts, const uint16_t sn)
	Store a new timestamp.
void	d_record_ts_stride (struct ts_sc_decomp *const ts_sc, const uint32_t ts_stride)
	Store the newly-parsed TS_STRIDE value.
bool	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	ts_decode_unscaled (struct ts_sc_decomp *const ts_sc, const uint32_t ts_bits)
	Decode timestamp (TS) value with unscaled value.
uint32_t	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* 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 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_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 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 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 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 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.