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Lame mp3 encoder for Android

基于LAME Project(lame.sourceforge.net)

使用方法

1.创建Lame编码器对象

可直接创建Lame对象

val lame = Lame()
...

或通过绑定服务跨进程使用

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.设置参数属性

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

lame 库本来还有很多其它可设置参数，这里java接口做了简化。如有需要请自行修改。

3.转码

针对不同输入格式，使用下面方法转码

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)

具体可参考 LameServiceTest.kt

4.flush & close

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

对原始LAME库的修改

添加lame_encode_buffer_byte 和 lame_encode_buffer_interleaved_byte 方法以支持8bit格式编码

参考项目 & 鸣谢

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

License

License 继承自原始LAME项目
GNU LESSER GENERAL PUBLIC LICENSE