decomp_scaled_rtp_ts.h File Reference

Scaled RTP Timestamp decoding. More...

#include "rohc_traces.h"
#include "decomp_wlsb.h"
#include <stdlib.h>
#include <stdint.h>
#include <stdbool.h>

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Data Structures
struct	ts_sc_decomp
	The scaled RTP Timestamp decoding context. More...

Functions
void	d_init_sc (struct ts_sc_decomp *const ts_scaled, rohc_trace_callback2_t trace_cb, void *const trace_cb_priv)
	Initialize the scaled RTP Timestamp decoding context. More...
void	ts_update_context (struct ts_sc_decomp *const ts_sc, const uint32_t ts, const uint16_t sn)
	Store a new timestamp. More...
void	d_record_ts_stride (struct ts_sc_decomp *const ts_sc, const uint32_t ts_stride)
	Store the newly-parsed TS_STRIDE value. More...
bool	ts_decode_unscaled_bits (struct ts_sc_decomp *const ts_sc, const uint32_t ts_unscaled_bits, const size_t ts_unscaled_bits_nr, uint32_t *const decoded_ts)
	Decode timestamp (TS) value with some LSB bits of the unscaled value. More...
bool	ts_decode_scaled_bits (struct ts_sc_decomp *const ts_sc, const uint32_t ts_scaled_bits, const size_t ts_scaled_bits_nr, uint32_t *const decoded_ts)
	Decode timestamp (TS) value with some LSB bits of the TS_SCALED value. More...
uint32_t	ts_deduce_from_sn (struct ts_sc_decomp *const ts_sc, const uint16_t sn)
	Deduct timestamp (TS) from Sequence Number (SN) More...

Detailed Description

Scaled RTP Timestamp decoding.

Author

David Moreau from TAS

Didier Barvaux didie.nosp@m.r@ba.nosp@m.rvaux.nosp@m..org

Function Documentation

d_init_sc()

void d_init_sc	(	struct ts_sc_decomp *const	ts_scaled,
		rohc_trace_callback2_t	trace_cb,
		void *const	trace_cb_priv
	)

Initialize the scaled RTP Timestamp decoding context.

Parameters

[in,out]	ts_scaled	The scaled RTP Timestamp decoding context to init
	trace_cb	The trace callback
	trace_cb_priv	An optional private context for the trace

d_record_ts_stride()

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

ts_decode_scaled_bits()

bool ts_decode_scaled_bits	(	struct ts_sc_decomp *const	ts_sc,
		const uint32_t	ts_scaled_bits,
		const size_t	ts_scaled_bits_nr,
		uint32_t *const	decoded_ts
	)

Decode timestamp (TS) value with some LSB bits of the 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_bits	The W-LSB-encoded TS_SCALED value
ts_scaled_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

ts_decode_unscaled_bits()

bool ts_decode_unscaled_bits	(	struct ts_sc_decomp *const	ts_sc,
		const uint32_t	ts_unscaled_bits,
		const size_t	ts_unscaled_bits_nr,
		uint32_t *const	decoded_ts
	)

Decode timestamp (TS) value with some LSB bits of the 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_unscaled_bits	The W-LSB-encoded TS value
ts_unscaled_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

ts_deduce_from_sn()

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

ts_update_context()

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)