[pjsip] directsound voice is too bad,why?

cat tanger tanger_wendy at yahoo.com.cn
Tue May 6 22:13:52 EDT 2008


hi,all.
i test directsound voice ,it too bad. but the same option (parament:ptime =20,quality=6;aec =0) in portaudio sound is very good.
i test direct sound with:
#   define PJMEDIA_SOUND_IMPLEMENTATION   PJMEDIA_SOUND_WIN32_DIRECT_SOUND
and
#   define PJMEDIA_PREFER_DIRECT_SOUND     1
can someone tell me why? how can i do ?
and i know  DirectSoundFullDuplexCreate8 can use GUID_DSCFX_CLASS_AEC do aec function.
anyone do this?
please give me suggestion.
thanks!
                              tanger.


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