Dialogic DIALOGIC MULTIMEDIA SOFTWARE FOR ADVANCEDTCA RELEASE 1.0

eIP_PARM Define	Description and Values

PARMCH_LATENCYFRAMEINIT_AUDIO	Specifies the amount of Packet Loss Recovery (PLR) latency
	(delay) that can be introduced by defining the initial number of
	frames that can be buffered. This parameter defines the
	starting value for initial latency. When “fixed mode” is enabled
	(see PARMCH_LATENCYALG_AUDIO), the number of frames
	buffered can grow up to 1.5 times the starting value. For
	example, if the parameter value is 6, the maximum number of
	frames that can be buffered is 9. The PLR module attempts to
	restore packets arriving at the receive end as close as possible
	to their original time-stamped positions. Arriving packets are
	decomposed into individual frames, each with a unique time
	stamp. Each new frame is then stored in a jitter buffer before it
	is sent to the decoder. This is done to allow packets arriving
	out of order to be inserted in the queue in the correct order.
	The size of this jitter buffer is defined by the number of frames
	stored and is controlled by the
	PARMCH_LATENCYFRAMEINIT_AUDIO,
	PARMCH_LATENCYFRAMEMAX_AUDIO, and
	PARMCH_LATENCYALG_AUDIO parameters.
	Type: Integer. Values: 1 to
	PARMCH_LATENCYFRAMEMAX_AUDIO (frames). Default: 6.
	Note: While the number of frames to be buffered should be
	set as high as possible for best quality, too high a value
	will add unnecessary latency to the system. Generally,
	the number of frames buffered should be the same size
	or slightly larger than the number of frames per packet.
PARMCH_LATENCYFRAMEMAX_AUDIO	Defines the maximum number of frames to be buffered in the
	Packet Loss Recovery (PLR) frame list. This parameter adds
	latency only when the buffer is already filled and additional
	frames arrive before there is space in the buffer. This provides
	for bursts of packets to arrive, which would have to be
	discarded otherwise. The PLR module attempts to restore
	packets arriving at the receive end as close as possible to their
	original time-stamped positions. Arriving packets are
	decomposed into individual frames, each with a unique time
	stamp. Each new frame is then stored in a jitter buffer before it
	is sent to the decoder. This is done to allow packets arriving
	out of order to be inserted in the queue in the correct order.
	The size of this jitter buffer is defined by the number of frames
	stored and is controlled by the
	PARMCH_LATENCYFRAMEINIT_AUDIO,
	PARMCH_LATENCYFRAMEMAX_AUDIO, and
	PARMCH_LATENCYALG_AUDIO parameters.
	Type: Integer. Values: 30 to 200 (frames). Default: 100.
	Note: 1. On Windows® systems, the upper limit of the value is
	dependent on the channel density and the kernel
	memory availability.
	2. While the number of frames to be buffered should be
	set as high as possible for best quality, too high a value
	will add unnecessary latency to the system. Generally,
	the number of frames buffered should be the same size
	or slightly larger than the number of frames per packet.

Dialogic® Multimedia Software for ATCA Release 1.0 Release Update, Rev 06 — January 23, 2008	23
Dialogic Corporation

eIP_PARM Define

PARMCH_LATENCYFRAMEINIT_AUDIO

PARMCH_LATENCYFRAMEMAX_AUDIO