c# - How to use offset parameter of StreamCreateFile in BASS library? -

i trying use bass library audio editing, if familiar library can me.

the function i'm using

bass.bass_streamcreatefile(filename, offset, length, flags); 

for little background, i'm using bass.net wrapper, working mp3 files. actual code i'm using function is:

int basestream = bass.bass_streamcreatefile(filename, starttimebytes, durationbasebytes, bassflag.bass_stream_prescan | bassflag.bass_stream_decode | bassflag.bass_sample_float); 

whenever offset (starttimebytes) equals 0, stream created fine, whenever offset non-zero, method returns 0, , error code given bass_error_fileform. however, files used work fine without offset (offset = 0).

maybe there wrong flags i'm using or something?

your mp3 files contain frames without offset. use 0 offset.
set playback position of stream use bass_channelsetposition().

1. create stream offset = 0;
2. translate time (seconds) position bytes, based on channel's format using bass_channelseconds2bytes();
3. set position bass_channelsetposition() , bass_pos_byte mode.