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Real-Time Internet MPEG-4 SA Player and the Streaming Engine
MPEG-4 Structure Audio is an algorithmic based coding standard designed for low bit-rate high quality audio. With this standard, the desired sound can be identical on both the encoder side and the decoder side by using Structured Audio Orchestra Language (SAOL) to generate sound samples. It requires a player and a streaming engine when real-time interactive internet presentations are necessary. In this paper, we present such a system implemented and applied over IBM PC based computers. The proposed streaming engine follows ISMA specification and its implementation is closely related to Apple's Darwin Server. After the streaming SA player receives the bitstream from the server, it converts SAOL data stream to JAVA codes and links to a proposed scheduler program generated from SASL data stream for direct execution such that one can hear the sound in real time. Unlike sfront, no intermediate C codes and C compilers are necessary. In order to improve the performance, optimized software modules such as the core opcodes and the core wavetable engine have been embedded. Significant speedup is achieved compared to the reference SAOLC decoder. Real-time demonstration of the system will be made during the presentation. Discussion of the possible future algorithmic coding method using JAVA is also given.
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