A simple android library for processing audio and mixing multiple audios parallelly or sequentially, made with android native media APIs (MediaCodec, MediaFormat, MediaMuxer) and JAVA.
- Mixing multple audios parallely or sequentially or processing single audio
- Trimming audio
- Adding an audio to another audio at specific time
- Changing sample-rate, bit-rate, channel(mono to stereo and vice versa) of audio
- Controlling volume of audio
- Making an audio file without any real audio data
- Making audio file by providing audio data
- Merging audios with video
- Fast transcoding to AAC
- Hardware accelerated
- Minimum API level 18
Step 1. Add the JitPack repository to your build file
allprojects {
repositories {
...
maven { url 'https://jitpack.io' }
}
}
Step 2. Add the dependency
dependencies {
implementation 'com.github.ZeroOneZeroR:android_audio_mixer:v1.1'
}
AudioInput input1 = new GeneralAudioInput(input1Path);
input1.setVolume(0.5f); //Optional
// It will produce a blank portion of 3 seconds between input1 and input2 if mixing type is sequential.
// But it will does nothing in parallel mixing.
AudioInput blankInput = new BlankAudioInput(3000000); //
AudioInput input2 = new GeneralAudioInput(context, input2Uri, null);
input2.setStartTimeUs(3000000); //Optional
input2.setEndTimeUs(9000000); //Optional
input2.setStartOffsetUs(5000000); //Optional. It is needed to start mixing the input at a certain time.
String outputPath = Environment.getDownloadCacheDirectory().getAbsolutePath()
+"/" +"audio_mixer_output.mp3"; // for example
final AudioMixer audioMixer = new AudioMixer(outputPath);
audioMixer.addDataSource(input1);
audioMixer.addDataSource(blankInput);
audioMixer.addDataSource(input2);
audioMixer.setSampleRate(44100); // Optional
audioMixer.setBitRate(128000); // Optional
audioMixer.setChannelCount(2); // Optional //1(mono) or 2(stereo)
// Smaller audio inputs will be encoded from start-time again if it reaches end-time
// It is only valid for parallel mixing
//audioMixer.setLoopingEnabled(true);
audioMixer.setMixingType(AudioMixer.MixingType.PARALLEL); // or AudioMixer.MixingType.SEQUENTIAL
audioMixer.setProcessingListener(new AudioMixer.ProcessingListener() {
@Override
public void onProgress(final double progress) {
runOnUiThread(new Runnable() {
@Override
public void run() {
progressDialog.setProgress((int) (progress * 100));
}
});
}
@Override
public void onEnd() {
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(context, "Success!!!", Toast.LENGTH_SHORT).show();
audioMixer.release();
}
});
}
});
//it is for setting up the all the things
audioMixer.start();
/* These getter methods must be called after calling 'start()'*/
//audioMixer.getOutputSampleRate();
//audioMixer.getOutputBitRate();
//audioMixer.getOutputChannelCount();
//audioMixer.getOutputDurationUs();
//starting real processing
audioMixer.processAsync();
// We can stop the processing immediately by calling audioMixer.stop() when we want.
// audioMixer.processSync() is generally not used.
// We have to use this carefully.
// Tt will do the processing in caller thread
// And calling audioMixer.stop() from the same thread won't stop the processing
Also external MediaMuxer can be used for muxing through new AudioMixer(externalMediaMuxer).
As for example, if we want to add audio with video,
we have to pass the media-muxer which is currently being used for video muxing.
MediaMuxer's starting, stopping, releasing must be handled externally.
In this case, we must call AudioMixer.start() before MediaMuxer.start() and
AudioMixer.processAsync() after MediaMuxer.start().
You can implement AudioInput interface and make your own audio processing system.