converting pcm file to mp3 using liblame in android

Question

I am using SimpleLameLibForAndroid to convert a pcm file that created using AudioRecord class in android,to mp3. I read the pcm file and encoded it into mp3 and then I write

Answer 1

I implemented a PCM to MP3 encoder just yesterday for my application using lame. I suggest not using SimpleLameLibForAndroid and instead adding lame to your project yourself. If you are using Android Studio, here is a good guide to get you started on that if you haven't done NDK before.

http://www.shaneenishry.com/blog/2014/08/17/ndk-with-android-studio/

As for implementing lame itself, below is a really good guide that I followed to get my application up and running. Use the wrapper.c from the .zip at the top of the page. This exposes useful methods so that you can avoid all the nasty Stream and Buffer stuff.

http://developer.samsung.com/technical-doc/view.do?v=T000000090

When all is said and done, the actual calls to the lame encoder are super simple as follows.

For initializing (use whatever settings you like):

public static final int NUM_CHANNELS = 1;
public static final int SAMPLE_RATE = 16000;
public static final int BITRATE = 64;
public static final int MODE = 1;
public static final int QUALITY = 7;
...

initEncoder(NUM_CHANNELS, SAMPLE_RATE, BITRATE, MODE, QUALITY);

For encoding (very easy):

int result = encodeFile(pcm.getPath(), mp3.getPath());
if (result == 0) {
    //success
}

And of course destroy the encoder when done with destroyEncoder().