I\'m developing an app which needs to get music file by streaming for playing live.
In the request song api I can specify the bandwith (eg: 50kbps, 100kbps, 300, 600 or
why not try to change your view of things. Try to flow with your users. say your user wishes to download 128 kbit quality song. you start the download , WHILE downloading you make an average download time, take a few seconds for this average to stabilize, and if it's below certain value make a pop up to tell the user that his connection is too slow for the current bandwidth and ask him if to lessen the quality or to keep downloading slowly.
This will:
I know i'm not answering your specific requirement, i'm just offering a different view.