Maybe the most robust Android Audio encapsulation library, with partial Rx support.
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Latest commit a2c0941 May 28, 2018

README.md

RxAndroidAudio

Android Audio encapsulation library, with part Rx support.

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Usage

About lambda support

This library use lambda expression, since com.android.tools.build:gradle:2.4.0, there is native support for lambda, so I use it instead of jack support or RetroLambda, if you have lambda issue during build, please upgrade your gradle-android into 2.4.0+, or use 1.5.1 of this library, thanks!

Add to gradle dependency of your module build.gradle:

allprojects {
    repositories {
        maven {
            url  "http://dl.bintray.com/piasy/maven"
        }
    }
}

dependencies {
    compile 'com.github.piasy:rxandroidaudio:1.5.2'
    compile 'com.github.piasy:AudioProcessor:1.5.2'
}

Use in code:

Record to file:

mAudioRecorder = AudioRecorder.getInstance();
mAudioFile = new File(
        Environment.getExternalStorageDirectory().getAbsolutePath() +
                File.separator + System.nanoTime() + ".file.m4a");
mAudioRecorder.prepareRecord(MediaRecorder.AudioSource.MIC,
        MediaRecorder.OutputFormat.MPEG_4, MediaRecorder.AudioEncoder.AAC,
        mAudioFile);
mAudioRecorder.startRecord();
// ...
mAudioRecorder.stopRecord();

Note: If you record a aac file, the sound quality will be poor if the sample rate and encoding bit rate is low, the sound quality will increase when you set a bigger sample rate and encoding bit rate, but as the sound quality improve, the recorded file size will also increase.

Play a file

With PlayConfig, to set audio file or audio resource, set volume, or looping:

mRxAudioPlayer.play(PlayConfig.file(audioFile).looping(true).build())
        .subscribeOn(Schedulers.io())
        .subscribe(new Observer<Boolean>() {
               @Override
               public void onSubscribe(final Disposable disposable) {

               }

               @Override
               public void onNext(final Boolean aBoolean) {
                    // prepared
               }

               @Override
               public void onError(final Throwable throwable) {

               }

               @Override
               public void onComplete() {
                    // play finished
                    // NOTE: if looping, the Observable will never finish, you need stop playing
                    // onDestroy, otherwise, memory leak will happen!
               }
           });

Full example of PlayConfig

PlayConfig.file(audioFile) // play a local file
    //.res(getApplicationContext(), R.raw.audio_record_end) // or play a raw resource
    .looping(true) // loop or not
    .leftVolume(1.0F) // left volume
    .rightVolume(1.0F) // right volume
    .build(); // build this config and play!

Record a stream:

mOutputFile = new File(Environment.getExternalStorageDirectory().getAbsolutePath() +
        File.separator + System.nanoTime() + ".stream.m4a");
mOutputFile.createNewFile();
mFileOutputStream = new FileOutputStream(mOutputFile);
mStreamAudioRecorder.start(new StreamAudioRecorder.AudioDataCallback() {
    @Override
    public void onAudioData(byte[] data, int size) {
        if (mFileOutputStream != null) {
            try {
                mFileOutputStream.write(data, 0, size);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    @Override
    public void onError() {
        mBtnStart.post(new Runnable() {
            @Override
            public void run() {
                Toast.makeText(getApplicationContext(), "Record fail",
                        Toast.LENGTH_SHORT).show();
                mBtnStart.setText("Start");
                mIsRecording = false;
            }
        });
    }
});

Play a stream:

Observable.just(mOutputFile).subscribeOn(Schedulers.io()).subscribe(new Action1<File>() {
    @Override
    public void call(File file) {
        try {
            mStreamAudioPlayer.init();
            FileInputStream inputStream = new FileInputStream(file);
            int read;
            while ((read = inputStream.read(mBuffer)) > 0) {
                mStreamAudioPlayer.play(mBuffer, read);
            }
            inputStream.close();
            mStreamAudioPlayer.release();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
});

Change the sound effect in stream mode:

mStreamAudioPlayer.play(
    mAudioProcessor.process(mRatio, mBuffer, StreamAudioRecorder.DEFAULT_SAMPLE_RATE),
    len);

See full example for more details.

Download demo apk.

Contribution are welcome!