| Vol. 3, No. 2, December 2006 - Art. 9 |
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| Adaptive Playout Scheduling with Audio Time-Scaling for the
Nomadik Multimedia Processor |
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by
Giulio Urlini, Andrea Lorenzo Vitali, STMicroelectronics;
Antonio Servetti, Politecnico di Torino, Juan Carlos De Martin,
IEIIT-CNT, CNR, Turin, Italy
Copyright
Copyright © STMicroelectronics, Politecnico di Torino,
Consiglio Nazionale della Ricerca, 2006 |
| | | Abstract
Some of the major challenges for interactive and streaming multimedia
applications are the delay and delay jitter of today’s IP
packet networks. In this paper, we present the implementation, on
the STMicroelectronics Nomadik© multimedia processor family,
of an advanced playout scheduling scheme that achieves high robustness
against late packets while maintaining very low buffering delay
at the receiver. We modified the porting on Nomadik© of a common
VoIP application in order to enable the adaptation of the playout
time of each speech frame to the estimated network delay. Proper
handling of time compression and expansion of speech frames is achieved
using a time-scale modification technique that does not alter the
frame frequency content. The same technique has also been adopted
for the concealment of packet losses. |
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