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开源软件介绍(OpenSource Introduction)：

NaraeAudioRecorder

AudioRecorder for Android powered by Kotlin.

Key Features

• Easy to use API
• Record on various format
  • core: pcm, wav
  • ffmpeg-recorder: mp3, m4a, wma, flac, aac
• Pause & Resume recording
• Integrated timer is provide maxAvailableTime feature
• Remove background noise using NoiseSuppressor API
• 100% write in Kotlin, but has Java Compatible
• Detect amount of time of Silent

Import

It distributed on JCenter, but sometime it's not available.

repositories {
    maven { url "https://dl.bintray.com/windsekirun/maven/" }
}

Core

Core module will contain most feature and two format. 'pcm' and 'wav'

implementation 'com.github.WindSekirun.NaraeAudioRecorder:core:1.3.0'

FFmpeg-Recorder

FFmpeg-Recorder will contain five format, 'mp3', 'm4a', 'wma', 'flac', 'aac'

This module will increase Final APK Size about 20MB. You can reduce APK Size by this guide

implementation 'nl.bravobit:android-ffmpeg:1.1.5'
implementation 'com.github.WindSekirun.NaraeAudioRecorder:ffmpeg-recorder:1.3.0'

Usages

Core

Initialization

 val audioRecorder = NaraeAudioRecorder()
 val destFile = File(Environment.getExternalStorageDirectory(), "/NaraeAudioRecorder/$fileName$extensions")
 audioRecorder.create() {
            this.destFile = destFile
 }

Define instance of 'NaraeAudioRecorder' and create file and provide with NaraeAudioRecorder.create is fine.

If you want use NoiseSuppressor, define instance of NoiseAudioSource and provide with NaraeAudioRecorder.create.

val recordConfig = AudioRecordConfig.defaultConfig()
val audioSource = NoiseAudioSource(recordConfig)
audioRecorder.create() {
          this.destFile = this.destFile
          this.recordConfig = recordConfig
          this.audioSource = audioSource
}

Initialization in Java

This is full sample of 'initialization in Java'. other feature is same.

File destFile = new File(getContext().getExternalFilesDir(null) + String.format("/recorder/%s.mp3", fileName));
destFile.getParentFile().mkdirs();

mAudioRecorder.checkPermission(getContext());
mAudioRecorder.create(FFmpegRecordFinder.class, config -> {
    config.setDestFile(destFile);
    config.setDebugMode(true);
    config.setTimerCountListener((currentTime, maxTime) -> { 
    });
            
    return null;
});

FFmpegAudioRecorder ffmpegAudioRecorder = (FFmpegAudioRecorder) mAudioRecorder.getAudioRecorder();
ffmpegAudioRecorder.setContext(getContext());
ffmpegAudioRecorder.setOnConvertStateChangeListener(state -> {
    if (state == FFmpegConvertState.SUCCESS) {
        mRecordedPath = destFile.getPath();
    }
});

Permission

Starting from 1.2.0, if permission isn't granted, NaraeAudioRecorder will throw RuntimeException.

• RECORD_AUDIO
• WRITE_EXTERNAL_STORAGE
• READ_EXTERNAL_STORAGE

So make sure grant proper permissions before using startRecording function.

Start / Stop / Pause / Resume

audioRecorder.startRecording(Context)
audioRecorder.stopRecording()
audioRecorder.pauseRecording()
audioRecorder.resumeRecording()

Custom config of AudioRecord

You can custom config of AudioRecord with AudioRecordConfig

fun defaultConfig() = AudioRecordConfig(MediaRecorder.AudioSource.MIC,
                AudioFormat.ENCODING_PCM_16BIT,
                AudioFormat.CHANNEL_IN_MONO,
                AudioConstants.FREQUENCY_44100)

Listen about state changes of record

audioRecorder.setOnRecordStateChangeListener(OnRecordStateChangeListener)

Set maxAvailableTime & Listen about changes of timer

audioRecorder.create(FFmpegRecordFinder::class.java) {
          ...
          this.maxAvailableMillis = TimeUnit.SECONDS.toMillis(20)
          this.timerCountListener = { currentTime, maxTime -> }
}

If you want use accuracy, define refreshTimerMillis in create section will be help for you. Default is 50.

FFmpeg-recorder

Using FFmpeg-recorder will need some additional info.

audioRecorder.create(FFmpegRecordFinder::class.java) {
            this.destFile = this.destFile
            this.recordConfig = recordConfig
            this.audioSource = audioSource
}

val ffmpegAudioRecorder: FFmpegAudioRecorder = audioRecorder.getAudioRecorder() as? FFmpegAudioRecorder ?: return
ffmpegAudioRecorder.setContext(this)

In parameters of create, use FFmpegRecordFinder::class.java to determine proper recorder with destFile .

FFmpeg-recorder uses WavAudioRecorder internally, recording in wav and convert them to desire format using FFmpeg command.

Change config of FFmpeg

You can custom config of FFmpeg using this options.

ffmpegAudioRecorder.setConvertConfig(FFmpegConvertConfig)

Default value is fun defaultConfig() = FFmpegConvertConfig(bitRate = FFmpegBitRate.def, samplingRate = FFmpegSamplingRate.ORIGINAL, mono = true).

Listen about state changes of convert

ffmpegAudioRecorder.setOnConvertStateChangeListener(OnConvertStateChangeListener)

Sample Application

Code

License

Core

Copyright 2019, WindSekirun (DongGil, Seo)

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

FFmpeg-recorder

• FFmpeg-Android License
• FFmpeg License