android 在不保存音频文件的情况下将麦克风记录到 ByteArray

Question

抱歉我的英语不好:(

我开始我的 android 应用程序项目，这个应用程序录制麦克风，如果我点击开始录制按钮，应用程序获取麦克风并将其写入文件，当我点击停止时，文件保存到 SD 卡中。

项目代码:

输出文件

OUTPUT_FILE = Environment.getExternalStorageState() + "/myaudio.3gp";

开始录制

public void startRecord() throws IOException{
    if (recorder != null)
    {
        recorder.release();
    }
    File outFile = new File(OUTPUT_FILE);
    if (outFile.exists())
    {
        outFile.delete();
    }

    recorder = new MediaRecorder();
    recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
    recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
    recorder.setOutputFormat(MediaRecorder.AudioEncoder.AMR_NB);
    recorder.setOutputFile(OUTPUT_FILE);
    recorder.prepare();
    recorder.start();
}

停止录制

public void stopRec(){
    recorder.stop();
}

PlaySound 录音文件

public void playRecFile() throws IOException{
    mediaPlayer = new MediaPlayer();
    mediaPlayer.setDataSource(OUTPUT_FILE);
    mediaPlayer.prepare();
    mediaPlayer.start();

}

我想录制语音并将其放入变量 ByteArray 中并在不将音频文件保存到 SD 卡的情况下播放

我有一个我想要的项目，但它是用 actionscript 3 编写的

import flash.media.*;
import flash.events.*;
import flash.utils.ByteArray;

var ch:SoundChannel
var mic:Microphone = Microphone.getMicrophone();

mic.addEventListener(SampleDataEvent.SAMPLE_DATA, micSampleDataHandler);
mic.addEventListener(ActivityEvent.ACTIVITY,onAct);

function onAct(evt:ActivityEvent):void
{
    trace(evt.activating,mic.activityLevel);
    if (!evt.activating)
    {
        if (soundBytes.length)
        {
            timerHandler();
        }
    }
}

var soundBytes:ByteArray = new ByteArray();
var soundO:ByteArray = new ByteArray();

function micSampleDataHandler(event:SampleDataEvent):void
{
    trace(event.data.length,event.data.bytesAvailable, soundBytes.length);
    while (event.data.bytesAvailable)
    {
        var sample:Number = event.data.readFloat();
        soundBytes.writeFloat(sample);
    }
}

function timerHandler():void
{
    mic.removeEventListener(SampleDataEvent.SAMPLE_DATA, micSampleDataHandler);
    soundBytes.position = 0;
    soundO.writeBytes(soundBytes);
    soundO.position = 0;
    soundBytes.position = 0;
    soundBytes.length=0;

    var sound:Sound= new Sound();
    sound.addEventListener(SampleDataEvent.SAMPLE_DATA, playbackSampleHandler);
    ch=sound.play();
    ch.addEventListener(Event.SOUND_COMPLETE,onSC)
    trace("OUTPUT",soundO.bytesAvailable);

}
function onSC(evt:Event):void
{
    trace("SOUND_COMPLETE");
}
function playbackSampleHandler(event:SampleDataEvent):void
{
    trace("SAMPLE_DATA: ",soundO.bytesAvailable)
    for (var i:int = 0; i < 8192; i++)
    {
        if (soundO.bytesAvailable < 4)
        {
         break;
        }
        var sample:Number = soundO.readFloat();
        event.data.writeFloat(sample);
        event.data.writeFloat(sample);      
    }
    if (soundO.bytesAvailable < 4 && soundO.position!==0)
    {
        mic.addEventListener(SampleDataEvent.SAMPLE_DATA, micSampleDataHandler);
        soundO.position=0
        soundO.length = 0;

        trace("END
    }
}

Answer 1

查看此答案!它完全适用于 MediaRecorder 而不是 AudioRecord

尝试使用以下解决方案使用 MediaRecorder 将音频录制到字节数组:

    // Byte array for audio record
    ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();

    ParcelFileDescriptor[] descriptors = ParcelFileDescriptor.createPipe();
    ParcelFileDescriptor parcelRead = new ParcelFileDescriptor(descriptors[0]);
    ParcelFileDescriptor parcelWrite = new ParcelFileDescriptor(descriptors[1]);

    InputStream inputStream = new ParcelFileDescriptor.AutoCloseInputStream(parcelRead);

    MediaRecorder recorder = new MediaRecorder();
    recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
    recorder.setOutputFormat(MediaRecorder.OutputFormat.AMR_NB);
    recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
    recorder.setOutputFile(parcelWrite.getFileDescriptor());
    recorder.prepare();

    recorder.start();


    int read;
    byte[] data = new byte[16384];

    while ((read = inputStream.read(data, 0, data.length)) != -1) {
        byteArrayOutputStream.write(data, 0, read);
    }

    byteArrayOutputStream.flush();

我将此代码包装在 AsyncTask 中以开始执行。

此外，不要忘记运行以下代码来停止录制:

    recorder.stop();
    recorder.reset();
    recorder.release();

要将 byteArrayOutputStream 转换为 byte[]，请使用 byteArrayOutputStream.toByteArray()