commit first version
add pthreadGC2.dll
fix read_packet function return -1.
update libav.dll
add seeking flag && change source.dll
add close function
add auio volume
add a volume adjustment interface
fix media_source when exits blocking bug.
change source file encoding to utf8
Update core/avplayer_impl.cpp
add rtsp and http playback.
fixed a wrong memory release, it's possible to memory leak and crash.
delete release, release change to download.
adjust the code and modify the doc.
modify readme url.
Update avcore/stdafx.h
Update video/ins.h
Update source/ins.h
Update audio/ins.h