将 MIC 直接传输到电话扬声器的 Android 程序

Question

我正在编写一个 Android 程序，将 MIC 直接流式传输到电话扬声器。代码有效，但 UI 挂起，应用程序挂起。但即使应用程序挂起，音频传输仍然有效。错误在哪里..？

 RecordBufferSize=AudioRecord.getMinBufferSize(sampleRateInHz,AudioFormat.CHANNEL_IN_MONO,AudioFormat.ENCODING_PCM_16BIT);
    TrackBufferSize= AudioTrack.getMinBufferSize(sampleRateInHz,AudioFormat.CHANNEL_OUT_MONO,AudioFormat.ENCODING_PCM_16BIT);

    am = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
    Record record = new Record();
    record.run();

}
public class Record extends Thread
{

    final short[] buffer = new short[RecordBufferSize];
    short[] readBuffer = new short[TrackBufferSize];

    public void run() {
        isRecording = true;
        android.os.Process.setThreadPriority(android.os.Process.THREAD_PRIORITY_URGENT_AUDIO);
        AudioRecord arec = new AudioRecord(MediaRecorder.AudioSource.MIC,sampleRateInHz,AudioFormat.CHANNEL_IN_MONO, AudioFormat.ENCODING_PCM_16BIT,RecordBufferSize);
        AudioTrack atrack = new AudioTrack(AudioManager.STREAM_MUSIC,sampleRateInHz,AudioFormat.CHANNEL_OUT_MONO, AudioFormat.ENCODING_PCM_16BIT, TrackBufferSize, AudioTrack.MODE_STREAM);
        //am.setRouting(AudioManager.MODE_NORMAL, AudioManager.ROUTE_EARPIECE, AudioManager.ROUTE_ALL);
        atrack.setPlaybackRate(sampleRateInHz);
        byte[] buffer = new byte[RecordBufferSize];
        arec.startRecording();
        atrack.play();
        while(isRecording) {
            AudioLenght=arec.read(buffer, 0, RecordBufferSize);
            atrack.write(buffer, 0, AudioLenght);
        }
        arec.stop();
        atrack.stop();
        isRecording = false;
    }
}

这是我的代码。

Answer 1

我试过了，得到了结果。试试这个

我使用的 Java 代码:-

package com.example.root.akuvo;

import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.PorterDuff;
import android.media.AudioAttributes;
import android.media.AudioDeviceInfo;
import android.media.AudioFormat;
import android.media.AudioManager;
import android.media.AudioRecord;
import android.media.AudioTrack;
import android.media.MediaRecorder;
import android.media.audiofx.AcousticEchoCanceler;
import android.media.audiofx.AutomaticGainControl;
import android.media.audiofx.BassBoost;
import android.media.audiofx.NoiseSuppressor;
import android.os.Build;
import android.support.annotation.RequiresApi;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.Button;


public class MicToSpeakerActivity extends AppCompatActivity {

    //Audio
    private Button mOn;
    private boolean isOn;
    private boolean isRecording;
    private AudioRecord record;
    private AudioTrack player;
    private AudioManager manager;
    private int recordState, playerState;
    private int minBuffer;

    //Audio Settings
    private final int source = MediaRecorder.AudioSource.CAMCORDER;
    private final int channel_in = AudioFormat.CHANNEL_IN_MONO;
    private final int channel_out = AudioFormat.CHANNEL_OUT_MONO;
    private final int format = AudioFormat.ENCODING_PCM_16BIT;

    private final static int REQUEST_ENABLE_BT = 1;
    private boolean IS_HEADPHONE_AVAILBLE=false;

    @RequiresApi(api = Build.VERSION_CODES.M)
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_mic_to_speaker);

        //Reduce latancy
        setVolumeControlStream(AudioManager.MODE_IN_COMMUNICATION);


        mOn = (Button) findViewById(R.id.button);
        isOn = false;
        isRecording = false;

        manager = (AudioManager) this.getSystemService(Context.AUDIO_SERVICE);
        manager.setMode(AudioManager.MODE_IN_COMMUNICATION);

        //Check for headset availability
        AudioDeviceInfo[] audioDevices = manager.getDevices(AudioManager.GET_DEVICES_ALL);
        for(AudioDeviceInfo deviceInfo : audioDevices) {
            if (deviceInfo.getType() == AudioDeviceInfo.TYPE_WIRED_HEADPHONES || deviceInfo.getType() == AudioDeviceInfo.TYPE_WIRED_HEADSET || deviceInfo.getType() == AudioDeviceInfo.TYPE_USB_HEADSET) {
                IS_HEADPHONE_AVAILBLE = true;
            }
        }
        if (!IS_HEADPHONE_AVAILBLE){
            // get delete_audio_dialog.xml view

            LayoutInflater layoutInflater = LayoutInflater.from(MicToSpeakerActivity.this);
            View promptView = layoutInflater.inflate(R.layout.insert_headphone_dialog, null);
            AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(MicToSpeakerActivity.this);
            alertDialogBuilder.setView(promptView);

            // setup a dialog window
            alertDialogBuilder.setCancelable(false)
                    .setPositiveButton("Try Again", new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int id) {
                            startActivity(new Intent(getIntent()));
                        }
                    })
                    .setNegativeButton("Cancel",
                            new DialogInterface.OnClickListener() {
                                public void onClick(DialogInterface dialog, int id) {
                                    startActivity(new Intent(MicToSpeakerActivity.this,MainActivity.class));
                                    dialog.cancel();
                                }
                            });

            // create an alert dialog
            AlertDialog alert = alertDialogBuilder.create();
            alert.show();
        }

        initAudio();

        mOn.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View view) {
                mOn.getBackground().setColorFilter(getResources().getColor(!isOn ? R.color.colorOn : R.color.colorOff), PorterDuff.Mode.SRC_ATOP);
                isOn = !isOn;
                if(isOn) {
                    (new Thread() {
                        @Override
                        public void run()
                        {
                            startAudio();
                        }
                    }).start();
                } else {
                    endAudio();
                }
            }
        });
    }
    public void initAudio() {
        //Tests all sample rates before selecting one that works
        int sample_rate = getSampleRate();
        minBuffer = AudioRecord.getMinBufferSize(sample_rate, channel_in, format);

        record = new AudioRecord(source, sample_rate, channel_in, format, minBuffer);
        recordState = record.getState();
        int id = record.getAudioSessionId();
        Log.d("Record", "ID: " + id);
        playerState = 0;
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            player = new AudioTrack(
                    new AudioAttributes.Builder().setUsage(AudioAttributes.USAGE_MEDIA).setContentType(AudioAttributes.CONTENT_TYPE_MUSIC).build(),
                    new AudioFormat.Builder().setEncoding(format).setSampleRate(sample_rate).setChannelMask(channel_out).build(),
                    minBuffer,
                    AudioTrack.MODE_STREAM,
                    AudioManager.AUDIO_SESSION_ID_GENERATE);
            playerState = player.getState();
            // Formatting Audio
            if(AcousticEchoCanceler.isAvailable()) {
                AcousticEchoCanceler echo = AcousticEchoCanceler.create(id);
                echo.setEnabled(true);
                Log.d("Echo", "Off");
            }
            if(NoiseSuppressor.isAvailable()) {
                NoiseSuppressor noise = NoiseSuppressor.create(id);
                noise.setEnabled(true);
                Log.d("Noise", "Off");
            }
            if(AutomaticGainControl.isAvailable()) {
                AutomaticGainControl gain = AutomaticGainControl.create(id);
                gain.setEnabled(false);
                Log.d("Gain", "Off");
            }
            BassBoost base = new BassBoost(1, player.getAudioSessionId());
            base.setStrength((short) 1000);
        }
    }

    public void startAudio() {
        int read = 0, write = 0;
        if(recordState == AudioRecord.STATE_INITIALIZED && playerState == AudioTrack.STATE_INITIALIZED) {
            record.startRecording();
            player.play();
            isRecording = true;
            Log.d("Record", "Recording...");
        }
        while(isRecording) {
            short[] audioData = new short[minBuffer];
            if(record != null)
                read = record.read(audioData, 0, minBuffer);
            else
                break;
            Log.d("Record", "Read: " + read);
            if(player != null)
                write = player.write(audioData, 0, read);
            else
                break;
            Log.d("Record", "Write: " + write);
        }
    }

    public void endAudio() {
        if(record != null) {
            if(record.getRecordingState() == AudioRecord.RECORDSTATE_RECORDING)
                record.stop();
            isRecording = false;
            Log.d("Record", "Stopping...");
        }
        if(player != null) {
            if(player.getPlayState() == AudioTrack.PLAYSTATE_PLAYING)
                player.stop();
            isRecording = false;
            Log.d("Player", "Stopping...");
        }
    }

    public int getSampleRate() {
        //Find a sample rate that works with the device
        for (int rate : new int[] {8000, 11025, 16000,  22050, 44100, 48000}) {
            int buffer = AudioRecord.getMinBufferSize(rate, channel_in, format);
            if (buffer > 0)
                return rate;
        }
        return -1;
    }

}

我使用的 XML 代码:

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.root.akuvo.MicToSpeakerActivity">

    <Button
        android:id="@+id/button"
        android:layout_width="104dp"
        android:layout_height="102dp"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:background="@android:drawable/ic_lock_power_off"
        android:backgroundTint="@color/colorOff"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.396" />

</android.support.constraint.ConstraintLayout>