Is there a way to re-encode an MP3 or any other audio file in Android?

I have a source MP3 file, and it's unknown how many channels it has, or the sampling rate. I need to re-encode it so that the resulting file is mono and 8kH开发者_运维技巧z samling rate. The format is unimportant, as long as MediaPlayer can play it. Is there anything in the SDK that allows me to do this.

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Are you trying to play it over a bluetooth headset?

I experimented with that a while back, but didn't use the MediaPlayer. Instead, I used an approach more like the one here:

http://mindtherobot.com/blog/580/android-audio-play-a-wav-file-on-an-audiotrack/

I was able to get mono audio over bluetooth working, but it's a real pain. Since the app was just for personal use, I eventually decided to just get a better bluetooth headset that supported the new stereo audio standard. With a stereo headset, you don't have to write any code at all - just turn on bluetooth, sync with the device, and you're done.

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AFAIK no.

There doesn't seem to be a way to use MediaPlayer/MediaRecorder to transcode an MP3 (hypothetically... unless you're looking for a low-quality transcoding, i.e. play the MP3 file using MediaPlayer and setup MediaRecorder to record whatever's coming in through the microphone - some of that audio would be the MP3 you're playing).

Transcode the MP3 file on your local desktop computer is your best bet.