get-sunday / RxAndroidAudio

Maybe the most robust Android Audio encapsulation library, with part Rx support.

RxAndroidAudio

Android Audio encapsulation library, with part Rx support.

Usage

Add to gradle dependency of your module build.gradle:

repositories {
    jcenter()
}

dependencies {
    compile 'com.github.piasy:rxandroidaudio:1.2.5'
}

Declare permissions:

<uses-permission android:name="android.permission.RECORD_AUDIO"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

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 Action1<Boolean>() {
            @Override
            public void call(Boolean aBoolean) {
                // play finished
                // NOTE: if looping, the Single 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();
        }
    }
});

See full example for more details.

Download demo apk.

Dev tips

• You need create an empty file named bintray.properties under root project dir, which is used for uploading artifact to bintray.

Contribution

• Please follow my code style based on SquareAndroid