Lame mp3 encoder for Android

Based on LAME Project (lame.sourceforge.net)

Usage

1.Create Lame encoder object

directly create a Lame object

val lame = Lame()
...

Or binding the service (cross-process)

private val intent = Intent("io.github.hesoft.lame.MP3EncodeSERVICE")
context.bindService(intent, object : ServiceConnection {
    override fun onServiceConnected(name: ComponentName?, serviceBinder: IBinder) {
        val service = ILameService.Stub.asInterface(serviceBinder)
        val lame = service.create(Binder())
        ...
    }

    override fun onServiceDisconnected(name: ComponentName?) {}

}, Context.BIND_AUTO_CREATE)

2.Set parameter properties

// inputSampleRate
// outputSampleRate
// outputBitRate
// outputQuality
// outputMode
lame.initParams(
    44100,
    44100, 320, 3, MPEGMode.MONO
)

3.Encode

Use the following method to encode, each method is for a different input format

encodeUnsigned8bit(byte[] pcm_l, byte[] pcm_r, int inSize, byte[] outBytes)  
encodeSigned16bit(byte[] pcm_l, byte[] pcm_r, int inSize, byte[] outBytes)  
encodeSigned32bit(byte[] pcm_l, byte[] pcm_r, int inSize, byte[] outBytes)  
encodeSigned32bitFloat(byte[] pcm_l, byte[] pcm_r, int inSize, byte[] outBytes)  
encodeSigned64bitDouble(byte[] pcm_l, byte[] pcm_r, int inSize, byte[] outBytes)  
encodeUnsigned8bitInterleaved(byte[] pcm, int inSize, byte[] outBytes)  
encodeSigned16bitInterleaved(byte[] pcm, int inSize, byte[] outBytes)  
encodeSigned32bitInterleaved(byte[] pcm, int inSize, byte[] outBytes)  
encodeSigned32bitFloatInterleaved(byte[] pcm, int inSize, byte[] outBytes)  
encodeSigned64bitDoubleInterleaved(byte[] pcm, int inSize, byte[] outBytes)  

Demo: LameServiceTest.kt

4.flush & close

val outSize = lame.flush(outBuff)
output.write(outBuff, 0, outSize)
output.close()
lame.destroy()

Modifications to the original LAME library

add lame_encode_buffer_byte and lame_encode_buffer_interleaved_byte method to support 8-bit format encoding

reference project & acknowledgements

https://github.com/4332weizi/AME/

License

License inherits from original LAME Project.
GNU LESSER GENERAL PUBLIC LICENSE