ts_sc_decomp.h File Reference

Scaled RTP Timestamp decoding. More...

#include "lsb.h"
#include <stdint.h>

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Data Structures
struct	ts_sc_decomp
	Scaled RTP Timestamp decoding object. More...
Functions
void	d_create_sc (struct ts_sc_decomp *const ts_sc)
	Create the 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.
int	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)

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Detailed Description

Scaled RTP Timestamp decoding.

Author:

David Moreau from TAS

Didier Barvaux <didier@barvaux.org>

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Function Documentation

void d_create_sc

(

struct ts_sc_decomp *const

ts_sc

)

Create the ts_sc_decomp object.

Parameters:

ts_sc

The ts_sc_decomp object to create

References d_lsb_init(), 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, 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, and rohc_debugf.

Referenced by decode_extension3(), and rtp_decode_dynamic_rtp().

int 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:

1 in case of success, 0 otherwise

References d_get_lsb_ref(), d_lsb_decode32(), 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, ts_sc_decomp::ts_offset, and ts_sc_decomp::ts_stride.

Referenced by decode_uo1(), and decode_uor2().

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.

Referenced by decode_uo1(), decode_uor2(), and rtp_decode_dynamic_rtp().

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.

Referenced by decode_uo0(), decode_uo1(), and decode_uor2().

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 d_lsb_sync_ref(), d_lsb_update(), 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, ts_sc_decomp::sn, sn, ts_sc_decomp::ts, ts_sc_decomp::ts_offset, ts_sc_decomp::ts_scaled, and ts_sc_decomp::ts_stride.

Referenced by decode_uo0(), decode_uo1(), decode_uor2(), and rtp_decode_dynamic_rtp().