I added some features into the AudioStreamer#19

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sprhawk wants to merge 11 commits intoDigitalDJ:masterfrom

Commits on Dec 10, 2011

added local file stream support; added prebuffering and a new thread to push buffer into audio queue(to pre-buffer audio file as soon as possible, to minimize influence of network various (specific…
sprhawk
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added local file streaming to SHOUTCAST; fixed set streamer = NULL if openReadStream failed; added macro switch to turn on/off prebuffering feature
sprhawk
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Commits on Dec 11, 2011

added property ivar declaration to .h, which is required under MacOSX
sprhawk
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Commits on Dec 13, 2011

added synchronization to _bufferPushingThread
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Commits on Dec 14, 2011