Android - 錄制視頻時靜音麥克風

Question

在按照與此類似的教程后，我正在使用MediaRecorder類使用相機錄制視頻

http://androidcookbook.com/Recipe.seam;jsessionid=40151FCD26222877E151C3EEFB406EED?recipeId=1375&recipeFrom=ViewTOC

我希望在錄音時能夠將麥克風靜音/取消靜音。 怎么可能？

我正在設置音頻源

 mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.CAMCORDER);
    mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);

但是，如果我想在某些時候沒有聲音錄音怎么辦？

Answer 1

請嘗試以下代碼：

private void setMicMuted(boolean state){
    AudioManager myAudioManager = (AudioManager)mContext.getSystemService(Context.AUDIO_SERVICE);

    // get the working mode and keep it
    int workingAudioMode = myAudioManager.getMode();

    myAudioManager.setMode(AudioManager.MODE_IN_COMMUNICATION);

    // change mic state only if needed
    if (myAudioManager.isMicrophoneMute() != state) {
        myAudioManager.setMicrophoneMute(state);
    }

    // set back the original working mode
    myAudioManager.setMode(workingAudioMode);
}

Answer 2

使用聲音（麥克風）或沒有聲音（麥克風）處理帶有AudioSource的視頻剪輯在mediaRecorder中錄制視頻片段，如果不需要聲音則不使用它。 使用mp4解析器合並所有剪輯。

要使用AudioSource和AudioEncoder錄制視頻以獲取攝像機參數，請獲取配置文件並將參數設置為MediaRecorder 。

在這里，我給出的代碼可能有助於錄制聲音和沒有聲音的視頻（視頻錄制可能會拉伸，因為我從你的問題中的gven鏈接中取出但是靜音和取消靜音將工作正常）

活動

import android.app.Activity;
import android.hardware.Camera;
import android.media.CamcorderProfile;
import android.media.MediaRecorder;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.Surface;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
import android.widget.ToggleButton;

import com.googlecode.mp4parser.BasicContainer;
import com.googlecode.mp4parser.authoring.Movie;
import com.googlecode.mp4parser.authoring.Track;
import com.googlecode.mp4parser.authoring.builder.DefaultMp4Builder;
import com.googlecode.mp4parser.authoring.container.mp4.MovieCreator;
import com.googlecode.mp4parser.authoring.tracks.AppendTrack;

import java.io.File;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.channels.WritableByteChannel;
import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;

public class MediaRecorderRecipe extends Activity implements SurfaceHolder.Callback {
    private MediaRecorder mMediaRecorder;
    private Camera mCamera;
    private SurfaceView mSurfaceView;
    private SurfaceHolder mHolder;
    private View mToggleButton;
    private ToggleButton togglemute;
    private boolean mInitSuccesful;
    private File videoDirectory;
    private Button btn;
    private File mainDirectory, clipsDir, mergedDir;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.test);
        videoDirectory = new File(Environment.getExternalStorageDirectory() + File.separator + "MuteUnMuteVideos");
        clipsDir = new File(videoDirectory.getAbsolutePath(), "Clips");
        clipsDir.mkdirs();
        mergedDir = new File(videoDirectory.getAbsolutePath(), "FinalMerged");
        mergedDir.mkdirs();
        deleteFilesDir(clipsDir.getAbsolutePath());
        // we shall take the video in landscape orientation

        mSurfaceView = (SurfaceView) findViewById(R.id.surfaceView);
        mHolder = mSurfaceView.getHolder();
        mHolder.addCallback(this);
        mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
        togglemute = (ToggleButton) findViewById(R.id.togglemute);
        mToggleButton = (ToggleButton) findViewById(R.id.toggleRecordingButton);
        btn = (Button) findViewById(R.id.doneRecording);
        mToggleButton.setOnClickListener(new OnClickListener() {
            @Override
            // toggle video recording
            public void onClick(View v) {

                if (((ToggleButton) v).isChecked()) {
                    try {
                        if (!mInitSuccesful)
                            initRecorder(mHolder.getSurface());
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                    mMediaRecorder.start();
                    togglemute.setEnabled(false);
                    btn.setEnabled(false);
                } else {
                    mMediaRecorder.stop();
                    mMediaRecorder.reset();
                    togglemute.setEnabled(true);
                    btn.setEnabled(true);
                    mInitSuccesful = false;

                }
            }
        });
        btn.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                new MergeVideosTask(MediaRecorderRecipe.this).execute();
            }
        });

    }

    private File outputFile;

    class MergeVideosTask extends AsyncTask {
        Activity activity;

        public MergeVideosTask(Activity activity) {
            this.activity = activity;
        }

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            /**
             * Show Progressbar
             */
        }

        @Override
        protected Object doInBackground(Object[] objects) {
            mergeVideos();
            return null;
        }

        @Override
        protected void onPostExecute(Object o) {
            super.onPostExecute(o);
            /**
             * Dismiss Progress
             */
            Toast.makeText(MediaRecorderRecipe.this, "Save Video : " + outputFile.getAbsolutePath(), Toast.LENGTH_LONG).show();
        }

        public void mergeVideos() {
            try {
                File parentDir = new File(clipsDir.getAbsolutePath());
                List<String> videosPathList = new ArrayList<>();
                File[] files = parentDir.listFiles();
                for (File file : files) {
                    videosPathList.add(file.getAbsolutePath());
                }

                List<Movie> inMovies = new ArrayList<>();
                for (int i = 0; i < videosPathList.size(); i++) {
                    String filePath = videosPathList.get(i);
                    try {
                        Movie movie = MovieCreator.build(filePath);
                        if (movie != null)
                            inMovies.add(movie);
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
                List<Track> videoTracks = new LinkedList<Track>();
                List<Track> audioTracks = new LinkedList<Track>();
                for (Movie m : inMovies) {
                    for (Track t : m.getTracks()) {
                        try {
                            if (t.getHandler().equals("soun")) {
                                audioTracks.add(t);
                            }
                            if (t.getHandler().equals("vide")) {
                                videoTracks.add(t);
                            }
                        } catch (Exception e) {

                        }
                    }
                }
                Movie result = new Movie();
                if (audioTracks.size() > 0) {
                    result.addTrack(new AppendTrack(audioTracks.toArray(new Track[audioTracks.size()])));
                }
                if (videoTracks.size() > 0) {
                    result.addTrack(new AppendTrack(videoTracks.toArray(new Track[videoTracks.size()])));
                }
                BasicContainer out = (BasicContainer) new DefaultMp4Builder().build(result);
                File f = null;
                String finalVideoPath;
                try {
                    f = setUpVideoFile(mergedDir.getAbsolutePath());
                    finalVideoPath = f.getAbsolutePath();

                } catch (IOException e) {
                    e.printStackTrace();
                    f = null;
                    finalVideoPath = null;
                }
                WritableByteChannel fc = new RandomAccessFile(finalVideoPath, "rw").getChannel();
                out.writeContainer(fc);
                fc.close();
                outputFile = new File(finalVideoPath);
//                deleteFilesDir(getExternalFilesDir(null).getAbsolutePath());

            } catch (Exception e) {
                e.printStackTrace();

                finish();
            }
        }

        File setUpVideoFile(String directory) throws IOException {
            File videoFile = null;
            if (Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState())) {
                File storageDir = new File(directory);
                if (storageDir != null) {
                    if (!storageDir.mkdirs()) {
                        if (!storageDir.exists()) {
                            Log.d("CameraSample", "failed to create directory");
                            return null;
                        }
                    }
                }
                videoFile = File.createTempFile("video_" + System.currentTimeMillis() + "_", ".mp4", storageDir);
            }
            return videoFile;
        }


    }

    private void deleteFilesDir(String path) {
        File dir = new File(path);
        if (dir.isDirectory()) {
            String[] children = dir.list();
            for (int i = 0; i < children.length; i++) {
                new File(dir, children[i]).delete();
            }
        }
    }

    /* Init the MediaRecorder, the order the methods are called is vital to
     * its correct functioning */
    private void initRecorder(Surface surface) throws IOException {
        // It is very important to unlock the camera before doing setCamera
        // or it will results in a black preview
        if (mCamera == null) {
            mCamera = Camera.open();
        }
        if (mMediaRecorder != null) {
            mMediaRecorder.reset();   // clear recorder configuration
            mMediaRecorder.release(); // release the recorder object
            mMediaRecorder = null;
        }
        mMediaRecorder = new MediaRecorder();
        mMediaRecorder.setPreviewDisplay(surface);


        CamcorderProfile profile = CamcorderProfile.get(CamcorderProfile.QUALITY_720P);
        Camera.Parameters parameters = mCamera.getParameters();
        List<Camera.Size> mSupportedPreviewSizes = parameters.getSupportedPreviewSizes();
        List<Camera.Size> mSupportedVideoSizes = parameters.getSupportedVideoSizes();
        Camera.Size optimalSize = getOptimalVideoSize(mSupportedVideoSizes,
                mSupportedPreviewSizes, profile.videoFrameWidth, profile.videoFrameHeight);
        /**
         * Prepare video with proper size. Preview and video size
         */
        profile.videoFrameWidth = optimalSize.width;
        profile.videoFrameHeight = optimalSize.height;
        mCamera.unlock();
        mMediaRecorder.setCamera(mCamera);
        mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
        if (!togglemute.isChecked()) {
            /**
             * Add Audio Source if video required with sound
             */
            mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);

        }
        mMediaRecorder.setOutputFormat(profile.fileFormat);
        mMediaRecorder.setVideoEncoder(profile.videoCodec);
        if (!togglemute.isChecked()) {
            /**
             * Add Audio Encoder if video required with sound
             */
            mMediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT);
        }
        mMediaRecorder.setVideoEncodingBitRate(profile.videoBitRate);
        mMediaRecorder.setVideoFrameRate(profile.videoFrameRate);
        mMediaRecorder.setVideoSize(profile.videoFrameWidth, profile.videoFrameHeight);
        File file = new File(clipsDir.getAbsolutePath(), System.currentTimeMillis() + ".mp4");
        // "touch" the file
        if (!file.exists()) {
            File parent = file.getParentFile();
            if (parent != null)
                if (!parent.exists())
                    if (!parent.mkdirs())
                        throw new IOException("Cannot create " +
                                "parent directories for file: " + file);

            file.createNewFile();
        }

        mMediaRecorder.setOutputFile(file.getAbsolutePath());
        mMediaRecorder.setPreviewDisplay(surface);

        try {
            mMediaRecorder.prepare();
        } catch (IllegalStateException e) {
            // This is thrown if the previous calls are not called with the
            // proper order
            e.printStackTrace();
        }

        mInitSuccesful = true;
    }

    public static Camera.Size getOptimalVideoSize(List<Camera.Size> supportedVideoSizes,
                                                  List<Camera.Size> previewSizes, int w, int h) {
        // Use a very small tolerance because we want an exact match.
        final double ASPECT_TOLERANCE = 0.1;
        double targetRatio = (double) w / h;

        // Supported video sizes list might be null, it means that we are allowed to use the preview
        // sizes
        List<Camera.Size> videoSizes;
        if (supportedVideoSizes != null) {
            videoSizes = supportedVideoSizes;
        } else {
            videoSizes = previewSizes;
        }
        Camera.Size optimalSize = null;

        // Start with max value and refine as we iterate over available video sizes. This is the
        // minimum difference between view and camera height.
        double minDiff = Double.MAX_VALUE;

        // Target view height
        int targetHeight = h;

        for (Camera.Size size : videoSizes) {
            double ratio = (double) size.width / size.height;
            if (Math.abs(ratio - targetRatio) > ASPECT_TOLERANCE)
                continue;
            if (Math.abs(size.height - targetHeight) < minDiff && previewSizes.contains(size)) {
                optimalSize = size;
                minDiff = Math.abs(size.height - targetHeight);
            }
        }
        if (optimalSize == null) {
            minDiff = Double.MAX_VALUE;
            for (Camera.Size size : videoSizes) {
                if (Math.abs(size.height - targetHeight) < minDiff && previewSizes.contains(size)) {
                    optimalSize = size;
                    minDiff = Math.abs(size.height - targetHeight);
                }
            }
        }
        return optimalSize;
    }

    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        try {
            if (!mInitSuccesful)
                initRecorder(mHolder.getSurface());
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {
        shutdown();
    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width,
                               int height) {
    }


    private void shutdown() {
        // Release MediaRecorder and especially the Camera as it's a shared
        // object that can be used by other applications
        mMediaRecorder.reset();
        mMediaRecorder.release();
        mCamera.release();

        // once the objects have been released they can't be reused
        mMediaRecorder = null;
        mCamera = null;
    }
}

布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical">

    <ToggleButton
        android:id="@+id/toggleRecordingButton"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:textOff="Start Recording"
        android:textOn="Stop Recording" />
    <ToggleButton
        android:id="@+id/togglemute"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:textOff="Mute Recording"
        android:textOn="UnMute Recording" />

    <Button
        android:id="@+id/doneRecording"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Finish Recording" />

    <FrameLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_parent">

        <SurfaceView
            android:id="@+id/surfaceView"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"></SurfaceView>

    </FrameLayout>
</LinearLayout>

的build.gradle

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    testCompile 'junit:junit:4.12'
    compile 'com.android.support:appcompat-v7:23.1.1'
    compile 'com.android.support:design:23.1.1'
    compile 'com.googlecode.mp4parser:isoparser:1.1.21' ///To MergeVideos
}

在錄制開始之前，需要每次創建新的MediaRecorder實例。 並且在重新停止后釋放。

如果Sound（Mic）所需的視頻在MediaRecorder中添加音頻源和音頻編碼器，如下所示。

mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);

mMediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT);

由於我沒有太多時間，所以沒有正確的代碼刪除視頻拉伸部分，但靜音/取消靜音將根據您的問題正常工作。

視頻錄制，請參考， 這

如果有的話，讓我知道

Answer 3

((AudioManager)context.getSystemService(Context.AUDIO_SERVICE)).setStreamMute(AudioManager.STREAM_SYSTEM,true);

試試，將所有聲音靜音。