android.media.MediaRecorder#start ( )源码实例Demo

下面列出了android.media.MediaRecorder#start ( ) 实例代码，或者点击链接到github查看源代码，也可以在右侧发表评论。

源代码1 项目： coursera-android 文件： AudioRecordingActivity.java

private void startRecording() {

        mRecorder = new MediaRecorder();
        mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
        mRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
        mRecorder.setOutputFile(mFileName);
        mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);

        try {
            mRecorder.prepare();
        } catch (IOException e) {
            Log.e(TAG, "Couldn't prepare and start MediaRecorder");
        }

        mRecorder.start();
    }

源代码2 项目： coursera-android 文件： AudioRecordingActivity.java

private void startRecording() {

		mRecorder = new MediaRecorder();
		mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
		mRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
		mRecorder.setOutputFile(mFileName);
		mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);

		try {
			mRecorder.prepare();
		} catch (IOException e) {
			Log.e(TAG, "Couldn't prepare and start MediaRecorder");
		}

		mRecorder.start();
	}

源代码3 项目： Conversations 文件： RecordingActivity.java

private boolean startRecording() {
    mRecorder = new MediaRecorder();
    mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
    mRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
    mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AAC);
    mRecorder.setAudioEncodingBitRate(96000);
    mRecorder.setAudioSamplingRate(22050);
    setupOutputFile();
    mRecorder.setOutputFile(mOutputFile.getAbsolutePath());

    try {
        mRecorder.prepare();
        mRecorder.start();
        mStartTime = SystemClock.elapsedRealtime();
        mHandler.postDelayed(mTickExecutor, 100);
        Log.d("Voice Recorder", "started recording to " + mOutputFile.getAbsolutePath());
        return true;
    } catch (Exception e) {
        Log.e("Voice Recorder", "prepare() failed " + e.getMessage());
        return false;
    }
}

源代码4 项目： droid-stealth 文件： RecorderActivity.java

/**
 * Starts the media recorder to record a new fragment
 */
private void startRecording() {
	mRecorder = new MediaRecorder();
	mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
	mRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
	mRecorder.setOutputFile(FileUtils.getPath(this, mOutputUri));
	mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
	try {
		mRecorder.prepare();
	}
	catch (IOException e) {
		Utils.d("Error writing file: "+e.toString());
		Toast.makeText(getApplicationContext(), "An error occured at recorder preparations.", Toast.LENGTH_LONG)
				.show();
	}

	mRecorder.start();
	mVolumeChecker.run();
}

源代码5 项目： BluetoothCameraAndroid 文件： TestActivity.java

protected void startRecording() throws IOException {
    mMediaRecorder = new MediaRecorder();  // Works well
    mCamera.unlock();

    mMediaRecorder.setCamera(mCamera);

    mMediaRecorder.setPreviewDisplay(mSurfaceHolder.getSurface());
    mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
    mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);

    mMediaRecorder.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_HIGH));
    mMediaRecorder.setOutputFile("/sdcard/zzzz.mp4");

    mMediaRecorder.prepare();
    mMediaRecorder.start();
}

源代码6 项目： NIM_Android_UIKit 文件： CaptureVideoActivity.java

private boolean startRecorderInternal() throws Exception {
    shutdownCamera();
    if (!initCamera()) {
        return false;
    }
    switchCamera.setVisibility(View.GONE);
    mediaRecorder = new MediaRecorder();
    camera.unlock();
    mediaRecorder.setCamera(camera);
    mediaRecorder.setAudioSource(MediaRecorder.AudioSource.CAMCORDER);
    mediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
    setCamcorderProfile();
    mediaRecorder.setPreviewDisplay(surfaceHolder.getSurface());
    mediaRecorder.setMaxDuration(1000 * VIDEO_TIMES);
    mediaRecorder.setOutputFile(filename);
    setVideoOrientation();
    mediaRecorder.prepare();
    mediaRecorder.start();
    return true;
}

源代码7 项目： AndroidVoiceAnimation 文件： MainActivity.java

@Override
public void onRecordStart() {
    Log.d(TAG, "onRecordStart");
    try {
        mMediaRecorder = new MediaRecorder();
        mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
        mMediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.AMR_NB);
        mMediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
        mMediaRecorder.setOutputFile(new File(Environment.getExternalStorageDirectory(), "audio.amr").getAbsolutePath());
        mMediaRecorder.prepare();
        mMediaRecorder.start();
        mIsRecording = true;
        mHandler.post(new Runnable() {
            @Override
            public void run() {
                float radius = (float) Math.log10(Math.max(1, mMediaRecorder.getMaxAmplitude() - 500)) * ScreenUtils.dp2px(MainActivity.this, 20);
                mTextView.setText(String.valueOf(radius));
                mVoiceView.animateRadius(radius);
                if (mIsRecording) {
                    mHandler.postDelayed(this, 50);
                }
            }
        });
    } catch (IOException e) {
        Toast.makeText(this, "MediaRecorder prepare failed!", Toast.LENGTH_SHORT).show();
        e.printStackTrace();
    }
}

源代码8 项目： zom-android-matrix 文件： AudioRecorder.java

public void startAudioRecording() {
    AudioManager am = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
    if (am.getMode() == AudioManager.MODE_NORMAL) {

        mediaRecorder = new MediaRecorder();

        String fileName = UUID.randomUUID().toString().substring(0, 8) + ".m4a";
        outputFilePath = new File(context.getFilesDir(), fileName);

        mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
        mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
        mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AAC);

        //maybe we can modify these in the future, or allow people to tweak them
        mediaRecorder.setAudioChannels(1);
        mediaRecorder.setAudioEncodingBitRate(22050);
        mediaRecorder.setAudioSamplingRate(64000);

        mediaRecorder.setOutputFile(outputFilePath.getAbsolutePath());

        try {
            isAudioRecording = true;
            mediaRecorder.prepare();
            mediaRecorder.start();

            if (getVisualizerView() != null) {
                startLevelListener();
            }
        } catch (Exception e) {
            Log.e(LOG_TAG, "couldn't start audio", e);
        }
    }
}

源代码9 项目： spydroid-ipcamera 文件： AudioStream.java

@Override
protected void encodeWithMediaRecorder() throws IOException {
	
	// We need a local socket to forward data output by the camera to the packetizer
	createSockets();

	Log.v(TAG,"Requested audio with "+mQuality.bitRate/1000+"kbps"+" at "+mQuality.samplingRate/1000+"kHz");
	
	mMediaRecorder = new MediaRecorder();
	mMediaRecorder.setAudioSource(mAudioSource);
	mMediaRecorder.setOutputFormat(mOutputFormat);
	mMediaRecorder.setAudioEncoder(mAudioEncoder);
	mMediaRecorder.setAudioChannels(1);
	mMediaRecorder.setAudioSamplingRate(mQuality.samplingRate);
	mMediaRecorder.setAudioEncodingBitRate(mQuality.bitRate);
	
	// We write the ouput of the camera in a local socket instead of a file !			
	// This one little trick makes streaming feasible quiet simply: data from the camera
	// can then be manipulated at the other end of the socket
	mMediaRecorder.setOutputFile(mSender.getFileDescriptor());

	mMediaRecorder.prepare();
	mMediaRecorder.start();

	try {
		// mReceiver.getInputStream contains the data from the camera
		// the mPacketizer encapsulates this stream in an RTP stream and send it over the network
		mPacketizer.setDestination(mDestination, mRtpPort, mRtcpPort);
		mPacketizer.setInputStream(mReceiver.getInputStream());
		mPacketizer.start();
		mStreaming = true;
	} catch (IOException e) {
		stop();
		throw new IOException("Something happened with the local sockets :/ Start failed !");
	}
	
}

源代码10 项目： AlbumCameraRecorder 文件： RecordingService.java

private void startRecording() {

        // 根据配置创建文件配置
        GlobalSpec globalSpec = GlobalSpec.getInstance();
        mAudioMediaStoreCompat = new MediaStoreCompat(getApplicationContext());
        mAudioMediaStoreCompat.setSaveStrategy(globalSpec.audioStrategy == null ? globalSpec.saveStrategy : globalSpec.audioStrategy);

        setFileNameAndPath();

        mRecorder = new MediaRecorder();
        mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
        mRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
        mRecorder.setOutputFile(mFile.getPath());
        mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AAC);
        mRecorder.setAudioChannels(1);
        if (MySharedPreferences.getPrefHighQuality(this)) {
            mRecorder.setAudioSamplingRate(44100);
            mRecorder.setAudioEncodingBitRate(192000);
        }

        try {
            mRecorder.prepare();
            mRecorder.start();
            mStartingTimeMillis = System.currentTimeMillis();

            //startTimer();
            //startForeground(1, createNotification());

        } catch (IOException e) {
            Log.e(LOG_TAG, "prepare() failed");
        }
    }

源代码11 项目： PrivacyStreams 文件： AudioRecorder.java

static Audio recordAudio(UQI uqi, long duration) throws IOException {
    List<Integer> amplitudes = new ArrayList<>();

    MediaRecorder recorder = new MediaRecorder();
    recorder.setAudioSource(Globals.AudioConfig.audioSource);
    recorder.setOutputFormat(Globals.AudioConfig.outputFormat);
    recorder.setAudioEncoder(Globals.AudioConfig.audioEncoder);

    String audioPath = "temp/audio_" + TimeUtils.getTimeTag() + ".amr";
    File tempAudioFile = StorageUtils.getValidFile(uqi.getContext(), audioPath, false);
    recorder.setOutputFile(tempAudioFile.getAbsolutePath());

    recorder.prepare();
    recorder.start();   // Recording is now started

    long startTime = System.currentTimeMillis();
    while (true) {
        long currentTime = System.currentTimeMillis();
        if (currentTime - startTime > duration) {
            break;
        }
        amplitudes.add(recorder.getMaxAmplitude());
    }

    recorder.stop();
    recorder.reset();   // You can reuse the object by going back to setAudioSource() step
    recorder.release(); // Now the object cannot be reused

    AudioData audioData = AudioData.newTempRecord(tempAudioFile, amplitudes);

    return new Audio(startTime, audioData);
}

源代码12 项目： Pix-Art-Messenger 文件： RecordingActivity.java

private boolean startRecording() {
    mRecorder = new MediaRecorder();
    mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
    if (alternativeCodec) {
        mRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
        mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
    } else {
        mRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
        mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AAC);
        mRecorder.setAudioEncodingBitRate(96000);
        mRecorder.setAudioSamplingRate(22050);
    }
    setupOutputFile();
    mRecorder.setOutputFile(mOutputFile.getAbsolutePath());

    try {
        mRecorder.prepare();
        mRecorder.start();
        mStartTime = SystemClock.elapsedRealtime();
        mHandler.postDelayed(mTickExecutor, 100);
        Log.d("Voice Recorder", "started recording to " + mOutputFile.getAbsolutePath());
        return true;
    } catch (Exception e) {
        Log.e("Voice Recorder", "prepare() failed " + e.getMessage());
        return false;
    }
}

源代码13 项目： DeviceConnect-Android 文件： HostAudioRecorder.java

private void initAudioContext(final String fileName, final RecordingListener listener) throws IOException {
    FileManager fileMgr = new FileManager(mContext, HostFileProvider.class.getName());
    mFile = new File(fileMgr.getBasePath(), fileName);

    mMediaRecorder = new MediaRecorder();
    mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
    mMediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
    mMediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AAC);
    mMediaRecorder.setOutputFile(mFile.toString());
    mMediaRecorder.prepare();
    mMediaRecorder.start();
}

源代码14 项目： GravityBox 文件： RecordingService.java

private void startRecording() {
    String statusMessage = "";
    String audioFileName = prepareOutputFile();
    try {
        mRecorder = new MediaRecorder();
        mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
        mRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
        mRecorder.setOutputFile(audioFileName);
        mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AAC);
        mRecorder.setAudioEncodingBitRate(96000);
        mRecorder.setAudioSamplingRate(mSamplingRate);
        mRecorder.setOnErrorListener(mOnErrorListener);
        mRecorder.prepare();
        mRecorder.start();
        mRecordingStatus = RECORDING_STATUS_STARTED;
        startForeground(1, mRecordingNotif);
    } catch (Exception e) {
        e.printStackTrace();
        mRecordingStatus = RECORDING_STATUS_ERROR;
        statusMessage = e.getMessage();
    } finally {
        Intent i = new Intent(ACTION_RECORDING_STATUS_CHANGED);
        i.putExtra(EXTRA_RECORDING_STATUS, mRecordingStatus);
        if (mRecordingStatus == RECORDING_STATUS_STARTED) {
            i.putExtra(EXTRA_AUDIO_FILENAME, audioFileName);
        }
        i.putExtra(EXTRA_STATUS_MESSAGE, statusMessage); 
        sendBroadcast(i);
    }
}

源代码15 项目： astrobee_android 文件： MainActivity.java

public void onRecordClick(View v) {
    if (!mRecording) {
        File f = new File(getExternalFilesDir(null), "recording.mp4");

        mRecorder = new MediaRecorder();
        mRecorder.setAudioSource(MediaRecorder.AudioSource.DEFAULT);
        mRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
        mRecorder.setOutputFile(f.getAbsolutePath());
        mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AAC_ELD);
        mRecorder.setAudioSamplingRate(48000);
        mRecorder.setAudioEncodingBitRate(96000);

        try {
            mRecorder.prepare();
        } catch (IOException e) {
            Log.e(TAG, "unable to prepare MediaRecorder");
            mRecorder = null;
            return;
        }

        mRecorder.start();
        mRecording = true;

        setState(STATE_RECORDING);
    } else {
        mRecorder.stop();
        mRecorder.release();
        mRecording = false;

        setState(STATE_IDLE);
    }
}

源代码16 项目： privacy-friendly-notes 文件： AudioNoteActivity.java

private void startRecording() {
    recording = true;
    mRecorder = new MediaRecorder();
    mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
    mRecorder.setOutputFormat(MediaRecorder.OutputFormat.AAC_ADTS);
    mRecorder.setOutputFile(mFilePath);
    mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AAC);
    try {
        mRecorder.prepare();
        final Animation animation = new AlphaAnimation(1, (float)0.5); // Change alpha from fully visible to invisible
        animation.setDuration(500); // duration - half a second
        animation.setInterpolator(new LinearInterpolator()); // do not alter animation rate
        animation.setRepeatCount(Animation.INFINITE); // Repeat animation infinitely
        animation.setRepeatMode(Animation.REVERSE); // Reverse animation at the end so the button will fade back in
        btnRecord.startAnimation(animation);
        startTime = System.currentTimeMillis();
        AudioNoteActivity.this.runOnUiThread(new Runnable() {
            @Override
            public void run() {
                if (mRecorder != null) {
                    long time = System.currentTimeMillis() - startTime;
                    int seconds = (int) time / 1000;
                    int minutes = seconds / 60;
                    seconds = seconds % 60;
                    tvRecordingTime.setText(String.format("%02d", minutes) + ":" + String.format("%02d", seconds));
                    mHandler.postDelayed(this, 100);
                }
            }
        });

        mRecorder.start();
    } catch (IOException e) {
        recording = false;
        e.printStackTrace();
    }
}

源代码17 项目： ui 文件： noxmllayoutexample.java

private void startRecording() {
    mRecorder = new MediaRecorder();
    mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
    mRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
    mRecorder.setOutputFile(mFileName);
    mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);

    try {
        mRecorder.prepare();
    } catch (IOException e) {
        Log.e(LOG_TAG, "prepare() failed");
    }

    mRecorder.start();
}

源代码18 项目： backgroundvideo 文件： VideoOverlay.java

public void Start(String filePath) throws Exception {
    if (this.mRecordingState == RecordingState.STARTED) {
        Log.w(TAG, "Already Recording");
        return;
    }

    if (!TextUtils.isEmpty(filePath)) {
        this.mFilePath = filePath;
    }

    attachView();

    if (this.mRecordingState == RecordingState.INITIALIZING) {
        this.mStartWhenInitialized = true;
        return;
    }

    if (TextUtils.isEmpty(mFilePath)) {
        throw new IllegalArgumentException("Filename for recording must be set");
    }

    initializeCamera();

    if (mCamera == null) {
        this.detachView();
        throw new NullPointerException("Cannot start recording, we don't have a camera!");
    }

    // Set camera parameters
    Camera.Parameters cameraParameters = mCamera.getParameters();
    mCamera.stopPreview(); //Apparently helps with freezing issue on some Samsung devices.
    mCamera.unlock();

    try {
        mRecorder = new MediaRecorder();
        mRecorder.setCamera(mCamera);

        CamcorderProfile profile;
        if (CamcorderProfile.hasProfile(mCameraId, CamcorderProfile.QUALITY_LOW)) {
            profile = CamcorderProfile.get(mCameraId, CamcorderProfile.QUALITY_LOW);
        } else {
            profile = CamcorderProfile.get(mCameraId, CamcorderProfile.QUALITY_HIGH);
        }

        Camera.Size lowestRes = CameraHelper.getLowestResolution(cameraParameters);
        profile.videoFrameWidth = lowestRes.width;
        profile.videoFrameHeight = lowestRes.height;

        mRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
        if (mRecordAudio) {
            // With audio
            mRecorder.setAudioSource(MediaRecorder.AudioSource.CAMCORDER);
            mRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
            mRecorder.setVideoFrameRate(profile.videoFrameRate);
            mRecorder.setVideoSize(profile.videoFrameWidth, profile.videoFrameHeight);
            mRecorder.setVideoEncodingBitRate(profile.videoBitRate);
            mRecorder.setAudioEncodingBitRate(profile.audioBitRate);
            mRecorder.setAudioChannels(profile.audioChannels);
            mRecorder.setAudioSamplingRate(profile.audioSampleRate);
            mRecorder.setVideoEncoder(profile.videoCodec);
            mRecorder.setAudioEncoder(profile.audioCodec);
        } else {
            // Without audio
            mRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
            mRecorder.setVideoFrameRate(profile.videoFrameRate);
            mRecorder.setVideoSize(profile.videoFrameWidth, profile.videoFrameHeight);
            mRecorder.setVideoEncodingBitRate(profile.videoBitRate);
            mRecorder.setVideoEncoder(profile.videoCodec);
        }

        mRecorder.setOutputFile(filePath);
        mRecorder.setOrientationHint(mOrientation);
        mRecorder.prepare();
        Log.d(TAG, "Starting recording");
        mRecorder.start();
    } catch (Exception e) {
        this.releaseCamera();
        Log.e(TAG, "Could not start recording! MediaRecorder Error", e);
        throw e;
    }
}

源代码19 项目： libstreaming 文件： AACStream.java

/** 
 * Records a short sample of AAC ADTS from the microphone to find out what the sampling rate really is
 * On some phone indeed, no error will be reported if the sampling rate used differs from the 
 * one selected with setAudioSamplingRate 
 * @throws IOException 
 * @throws IllegalStateException
 */
@SuppressLint("InlinedApi")
private void testADTS() throws IllegalStateException, IOException {
	
	setAudioEncoder(MediaRecorder.AudioEncoder.AAC);
	try {
		Field name = MediaRecorder.OutputFormat.class.getField("AAC_ADTS");
		setOutputFormat(name.getInt(null));
	}
	catch (Exception ignore) {
		setOutputFormat(6);
	}

	String key = PREF_PREFIX+"aac-"+mQuality.samplingRate;

	if (mSettings!=null && mSettings.contains(key)) {
		String[] s = mSettings.getString(key, "").split(",");
		mQuality.samplingRate = Integer.valueOf(s[0]);
		mConfig = Integer.valueOf(s[1]);
		mChannel = Integer.valueOf(s[2]);
		return;
	}

	final String TESTFILE = Environment.getExternalStorageDirectory().getPath()+"/spydroid-test.adts";

	if (!Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
		throw new IllegalStateException("No external storage or external storage not ready !");
	}

	// The structure of an ADTS packet is described here: http://wiki.multimedia.cx/index.php?title=ADTS

	// ADTS header is 7 or 9 bytes long
	byte[] buffer = new byte[9];

	mMediaRecorder = new MediaRecorder();
	mMediaRecorder.setAudioSource(mAudioSource);
	mMediaRecorder.setOutputFormat(mOutputFormat);
	mMediaRecorder.setAudioEncoder(mAudioEncoder);
	mMediaRecorder.setAudioChannels(1);
	mMediaRecorder.setAudioSamplingRate(mQuality.samplingRate);
	mMediaRecorder.setAudioEncodingBitRate(mQuality.bitRate);
	mMediaRecorder.setOutputFile(TESTFILE);
	mMediaRecorder.setMaxDuration(1000);
	mMediaRecorder.prepare();
	mMediaRecorder.start();

	// We record for 1 sec
	// TODO: use the MediaRecorder.OnInfoListener
	try {
		Thread.sleep(2000);
	} catch (InterruptedException e) {}

	mMediaRecorder.stop();
	mMediaRecorder.release();
	mMediaRecorder = null;

	File file = new File(TESTFILE);
	RandomAccessFile raf = new RandomAccessFile(file, "r");

	// ADTS packets start with a sync word: 12bits set to 1
	while (true) {
		if ( (raf.readByte()&0xFF) == 0xFF ) {
			buffer[0] = raf.readByte();
			if ( (buffer[0]&0xF0) == 0xF0) break;
		}
	}

	raf.read(buffer,1,5);

	mSamplingRateIndex = (buffer[1]&0x3C)>>2 ;
	mProfile = ( (buffer[1]&0xC0) >> 6 ) + 1 ;
	mChannel = (buffer[1]&0x01) << 2 | (buffer[2]&0xC0) >> 6 ;
	mQuality.samplingRate = AUDIO_SAMPLING_RATES[mSamplingRateIndex];

	// 5 bits for the object type / 4 bits for the sampling rate / 4 bits for the channel / padding
	mConfig = (mProfile & 0x1F) << 11 | (mSamplingRateIndex & 0x0F) << 7 | (mChannel & 0x0F) << 3;

	Log.i(TAG,"MPEG VERSION: " + ( (buffer[0]&0x08) >> 3 ) );
	Log.i(TAG,"PROTECTION: " + (buffer[0]&0x01) );
	Log.i(TAG,"PROFILE: " + AUDIO_OBJECT_TYPES[ mProfile ] );
	Log.i(TAG,"SAMPLING FREQUENCY: " + mQuality.samplingRate );
	Log.i(TAG,"CHANNEL: " + mChannel );

	raf.close();

	if (mSettings!=null) {
		Editor editor = mSettings.edit();
		editor.putString(key, mQuality.samplingRate+","+mConfig+","+mChannel);
		editor.commit();
	}

	if (!file.delete()) Log.e(TAG,"Temp file could not be erased");

}

源代码20 项目： libstreaming 文件： AudioStream.java

@Override
protected void encodeWithMediaRecorder() throws IOException {
	
	// We need a local socket to forward data output by the camera to the packetizer
	createSockets();

	Log.v(TAG,"Requested audio with "+mQuality.bitRate/1000+"kbps"+" at "+mQuality.samplingRate/1000+"kHz");
	
	mMediaRecorder = new MediaRecorder();
	mMediaRecorder.setAudioSource(mAudioSource);
	mMediaRecorder.setOutputFormat(mOutputFormat);
	mMediaRecorder.setAudioEncoder(mAudioEncoder);
	mMediaRecorder.setAudioChannels(1);
	mMediaRecorder.setAudioSamplingRate(mQuality.samplingRate);
	mMediaRecorder.setAudioEncodingBitRate(mQuality.bitRate);
	
	// We write the output of the camera in a local socket instead of a file !			
	// This one little trick makes streaming feasible quiet simply: data from the camera
	// can then be manipulated at the other end of the socket
	FileDescriptor fd = null;
	if (sPipeApi == PIPE_API_PFD) {
		fd = mParcelWrite.getFileDescriptor();
	} else  {
		fd = mSender.getFileDescriptor();
	}
	mMediaRecorder.setOutputFile(fd);
	mMediaRecorder.setOutputFile(fd);

	mMediaRecorder.prepare();
	mMediaRecorder.start();

	InputStream is = null;
	
	if (sPipeApi == PIPE_API_PFD) {
		is = new ParcelFileDescriptor.AutoCloseInputStream(mParcelRead);
	} else  {
		try {
			// mReceiver.getInputStream contains the data from the camera
			is = mReceiver.getInputStream();
		} catch (IOException e) {
			stop();
			throw new IOException("Something happened with the local sockets :/ Start failed !");
		}
	}

	// the mPacketizer encapsulates this stream in an RTP stream and send it over the network
	mPacketizer.setInputStream(is);
	mPacketizer.start();
	mStreaming = true;
	
}