try to use swresample/avresample

convert part is not finished
Merge branch 'master' into swr

Conflicts:
	src/QtAV/QtAV_Global.h
	src/libQtAV.pro
sdk header
Merge branch 'dev' into swr

Conflicts:
	src/QtAV/QtAV_Global.h
	src/libQtAV.pro
ffmpeg swresampler works(ref ffplay). but the speed is too fast

TODO:
mplayer2, avresample
build with ffmpeg 0.9(swr 0.5) support

TODO:
how to resolve runtime version
swr_get_delay
workaround for get sample buffer size

TODO:
why crash for swr 0.5?
config test for swresample
no swr support
add missing config.test files for swr
swr: play the correct speed. nb_samples means sampes per channel
swr: refine code. add comments
Merge branch 'master' into dev
Merge branch 'swr' into dev
buggy speed control
error code is <0
deal with EAGAIN. see ffmpeg(usleep 10000?)
player: renderer menu is clickable and keeps visible
player: repeat support. crash now
swr: fix inupt channels and layout error