android硬解碼(白平衡java例項)
阿新 • • 發佈：2019-02-19
【Android】使用MediaCodec硬編碼實現視訊直播推流端(一)
2016年06月15日 18:37:15 gitzzp 閱讀數：7162 標籤： 視訊 直播 推流 MediaCodec 硬編碼 更多
個人分類： 多媒體相關
廢話不說，直接上程式碼。
佈局檔案
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context="com.example.gitzzp.MainActivity"> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="publish" android:id="@+id/publish" android:layout_alignParentTop="true" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="stop" android:id="@+id/stop" android:layout_toRightOf="@id/publish" android:layout_marginTop="0dp" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="switch" android:id="@+id/swCam" android:layout_alignBottom="@id/stop" android:layout_toRightOf="@id/stop" /> <EditText android:id="@+id/vbitrate" android:textSize="14dp" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/publish" android:layout_marginTop="0dp" /> <EditText android:layout_width="wrap_content" android:layout_height="wrap_content" android:textSize="14dp" android:id="@+id/url" android:layout_below="@id/publish" android:layout_above="@+id/frameLayout" android:layout_toRightOf="@id/vbitrate" /> <FrameLayout android:layout_width="match_parent" android:layout_height="match_parent" android:layout_below="@id/vbitrate" android:layout_centerHorizontal="true" android:layout_marginTop="0dp" android:id="@+id/frameLayout"> <com.example.gitzzp.CameraPreview android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/preview" /> </FrameLayout> </RelativeLayout>
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非常簡單的佈局，沒什麼可說的，唯一要說的就是最後邊這個CameraPreview，這是一個自定義控制元件，繼承自SurfaceView，用於顯示攝像頭的預覽，具體程式碼後邊會貼出來。
MainActivity：
package com.example.gitzzp; import android.app.Activity; import android.content.SharedPreferences; import android.content.res.Configuration; import android.os.Bundle; import android.util.Log; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.view.WindowManager; import android.widget.Button; import android.widget.EditText; import android.widget.Toast; public class MainActivity extends Activity { private static final String TAG = "MainActivity"; private SharedPreferences sp; private CameraPreview mCameraView = null; private String mNotifyMsg; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); //保持螢幕常亮 getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON); setContentView(R.layout.activity_main1); // 響應螢幕旋轉事件 // setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_FULL_SENSOR); // 本地儲存資料 sp = getSharedPreferences("SrsPublisher", MODE_PRIVATE); SrsEncoder.rtmpUrl = sp.getString("rtmpUrl", SrsEncoder.rtmpUrl); SrsEncoder.vbitrate = sp.getInt("vbitrate", SrsEncoder.vbitrate); Log.i(TAG, String.format("init rtmp url %s, vbitrate=%dkbps", SrsEncoder.rtmpUrl, SrsEncoder.vbitrate)); // 設定程式剛開始顯示的url final EditText efu = (EditText) findViewById(R.id.url); efu.setText(SrsEncoder.rtmpUrl); // 設定初始化時的視訊位元速率 final EditText evb = (EditText) findViewById(R.id.vbitrate); evb.setText(String.format("%dkbps", SrsEncoder.vbitrate / 1000)); // for camera, @see https://developer.android.com/reference/android/hardware/Camera.html final Button btnPublish = (Button) findViewById(R.id.publish); final Button btnStop = (Button) findViewById(R.id.stop); final Button btnSwitch = (Button) findViewById(R.id.swCam); //佈局中的surfaceview mCameraView = (CameraPreview) findViewById(R.id.preview); btnPublish.setEnabled(true); btnStop.setEnabled(false); btnPublish.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { int vb = Integer.parseInt(evb.getText().toString().replaceAll("kbps", "")); SrsEncoder.vbitrate = vb * 1000; SrsEncoder.rtmpUrl = "替換為你自己想要推流的rtmp伺服器地址"; Log.i(TAG, String.format("RTMP URL changed to %s", SrsEncoder.rtmpUrl)); Log.i(TAG, String.format("Video bitrate changed to %skbps", SrsEncoder.vbitrate / 1000)); SharedPreferences.Editor editor = sp.edit(); editor.putInt("vbitrate", SrsEncoder.vbitrate); editor.putString("rtmpUrl", SrsEncoder.rtmpUrl); editor.commit(); btnPublish.setEnabled(false); btnStop.setEnabled(true); //釋出直播 mCameraView.startPublish(); } }); btnStop.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { mCameraView.stopPublish(); btnPublish.setEnabled(true); btnStop.setEnabled(false); } }); btnSwitch.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { mCameraView.initCameraPreview(1); } }); Thread.setDefaultUncaughtExceptionHandler(new Thread.UncaughtExceptionHandler() { @Override public void uncaughtException(Thread thread, Throwable ex) { mNotifyMsg = ex.getMessage(); runOnUiThread(new Runnable() { @Override public void run() { Toast.makeText(getApplicationContext(), mNotifyMsg，Toast.LENGTH_SHORT).show(); btnPublish.setEnabled(true); btnStop.setEnabled(false); mCameraView.stopPublish(); } }); } }); } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.menu_main, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { int id = item.getItemId(); if (id == R.id.action_settings) { return true; } return super.onOptionsItemSelected(item); } @Override protected void onResume() { super.onResume(); final Button btn = (Button) findViewById(R.id.publish); btn.setEnabled(true); mCameraView.handler.postDelayed(new Runnable() { @Override public void run() { mCameraView.initCameraPreview(); } },100); } @Override protected void onPause() { super.onPause(); mCameraView.stopPublish(); //停止預覽 mCameraView.stopCamera(); } @Override protected void onDestroy() { super.onDestroy(); mCameraView.stopPublish(); } @Override public void onConfigurationChanged(Configuration newConfig) { super.onConfigurationChanged(newConfig); mCameraView.stopPublish(); mCameraView.mEncoder.setScreenOrientation(newConfig.orientation); mCameraView.startPublish(); } }
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在MainActivity中做了一些控制元件和資料的初始化，監聽事件的新增，以及在各個生命週期中對surfaceview和camera的控制等操作。
當我們點選publish按鈕的時候，會根據我們設定的推流地址，位元速率等，呼叫surfaceview中的startPublish()來開始推流。swtich用於切換前置後置攝像頭。
CameraPreview:接收camera中的資料，並顯示出來，作為camera的預覽影象。
package com.example.gitzzp;
import android.app.Activity;
import android.content.Context;
import android.hardware.Camera;
import android.media.AudioRecord;
import android.media.MediaRecorder;
import android.os.Handler;
import android.os.Message;
import android.util.AttributeSet;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.widget.Toast;
import com.example.gitzzp.rtmp.RtmpPublisher;
import java.io.IOException;
import java.util.List;
/**
* 相機預覽影象
* Created by gitzzp on 16/6/2.
*/
public class CameraPreview extends SurfaceView implements SurfaceHolder.Callback, Camera.PreviewCallback {
private static final String TAG = "CameraPreview";
private SurfaceHolder mHolder;
private Activity mContext;
private AudioRecord mic = null;
private boolean isPublish = false;
private Thread aworker = null;//音訊錄製的執行緒
public Camera mCamera = null;
private int mPreviewRotation = 90;
private int mDisplayRotation = 90;
private int mCamId = Camera.getNumberOfCameras() - 1; // default camera 該裝置的攝像頭數量
// private byte[] mYuvFrameBuffer = new byte[SrsEncoder.VWIDTH * SrsEncoder.VHEIGHT * 3 / 2];
private byte[] mYuvFrameBuffer = new byte[SrsEncoder.VWIDTH * SrsEncoder.VHEIGHT * 3 *10];
private String mNotifyMsg;
Handler handler = new Handler(){
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
switch (msg.what){
case 1:
initCameraPreview();
break;
}
}
};
public CameraPreview(Context context) {
this(context,null);
}
public CameraPreview(Context context, AttributeSet attrs) {
this(context, attrs,0);
}
public CameraPreview(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
mContext = (Activity) context;
mHolder = getHolder();
mHolder.addCallback(this);
mHolder.setKeepScreenOn(true);
}
public void initCameraPreview(){
if (mCamera != null && mEncoder != null) {
stopCamera();
startCamera();
}else if(mCamera == null && mEncoder != null) {
startCamera();
}
}
public void initCameraPreview(int num) {
if (mCamera != null && mEncoder != null) {
mCamId = (mCamId + num) % Camera.getNumberOfCameras();
stopCamera();
mEncoder.swithCameraFace();
startCamera();
}else if(mCamera == null && mEncoder != null) {
mCamId = (mCamId + num) % Camera.getNumberOfCameras();
mEncoder.swithCameraFace();
startCamera();
}
}
//開始推流
public void startPublish() {
int ret = mEncoder.start();
//小於0表示有某個地方出錯 但是SrsEncoder中沒有做具體區分 統一以-1來進行返回 後期可以根據需求分別進行處理
//返回0表示流建立成功
if (ret < 0) {
return;
}
//開啟攝像頭
startCamera();
aworker = new Thread(new Runnable() {
@Override
public void run() {
android.os.Process.setThreadPriority(android.os.Process.THREAD_PRIORITY_AUDIO);
startAudio();
}
});
isPublish = true;
aworker.start();
}
public void startCamera() {
if (mCamera != null) {
Log.d(TAG, "start camera, already started. return");//攝像頭已經開啟
return;
}
if (mCamId > (Camera.getNumberOfCameras() - 1) || mCamId < 0) {
Log.e(TAG, "####### start camera failed, inviald params, camera No.="+ mCamId);
return;
}
mCamera = Camera.open(mCamId);
Camera.CameraInfo info = new Camera.CameraInfo();
//獲取攝像頭資訊
Camera.getCameraInfo(mCamId, info);
if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT){//前置攝像頭
mDisplayRotation = (mPreviewRotation + 180) % 360;
mDisplayRotation = (360 - mDisplayRotation) % 360;
} else {
mDisplayRotation = mPreviewRotation;
}
Camera.Parameters params = mCamera.getParameters();
/* preview size */
Camera.Size size = mCamera.new Size(SrsEncoder.VWIDTH, SrsEncoder.VHEIGHT);
if (!params.getSupportedPreviewSizes().contains(size)) {
//攝像頭預覽尺寸小於我們設定的預覽尺寸 丟擲異常
Thread.getDefaultUncaughtExceptionHandler().uncaughtException(Thread.currentThread(),
new IllegalArgumentException(String.format("Unsupported preview size %dx%d", size.width, size.height)));
}
/* picture size */
if (!params.getSupportedPictureSizes().contains(size)) {
//圖片尺寸小於我們設定的圖片尺寸
Thread.getDefaultUncaughtExceptionHandler().uncaughtException(Thread.currentThread(),
new IllegalArgumentException(String.format("Unsupported picture size %dx%d", size.width, size.height)));
}
/***** set parameters *****/
//params.set("orientation", "portrait");
//params.set("orientation", "landscape");
// params.setRotation(180);
params.setPictureSize(SrsEncoder.VWIDTH, SrsEncoder.VHEIGHT);
//設定預覽時的大小
params.setPreviewSize(SrsEncoder.VWIDTH, SrsEncoder.VHEIGHT);
//設定幀數
int[] range = findClosestFpsRange(SrsEncoder.VFPS, params.getSupportedPreviewFpsRange());
params.setPreviewFpsRange(range[0], range[1]);
//預覽圖格式
params.setPreviewFormat(SrsEncoder.VFORMAT);
//閃光燈控制
params.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);
//白平衡控制
params.setWhiteBalance(Camera.Parameters.WHITE_BALANCE_AUTO);
//設定情景模式 改變該引數可以覆蓋上邊的幾個引數 例如 最初閃光燈是開啟的 在變成夜間模式之後 會關閉
params.setSceneMode(Camera.Parameters.SCENE_MODE_AUTO);
//設定自動對焦 共分兩步 這是第一步
params.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE);
mCamera.setParameters(params);
//預覽圖顯示的角度
mCamera.setDisplayOrientation(mPreviewRotation);
//緩衝區大小
mCamera.addCallbackBuffer(mYuvFrameBuffer);
//設定自動對焦的第二步
mCamera.cancelAutoFocus();
mCamera.setPreviewCallbackWithBuffer(this);
try {
//設定surfacebview顯示攝像頭的預覽介面
mCamera.setPreviewDisplay(mHolder);
} catch (IOException e) {
e.printStackTrace();
}
mCamera.startPreview();
}
private int[] findClosestFpsRange(int expectedFps, List<int[]> fpsRanges) {
expectedFps *= 1000;
int[] closestRange = fpsRanges.get(0);
int measure = Math.abs(closestRange[0] - expectedFps) + Math.abs(closestRange[1] - expectedFps);
for (int[] range : fpsRanges) {
if (range[0] <= expectedFps && range[1] >= expectedFps) {
int curMeasure = Math.abs(range[0] - expectedFps) + Math.abs(range[1] - expectedFps);
if (curMeasure < measure) {
closestRange = range;
measure = curMeasure;
}
}
}
return closestRange;
}
public void stopCamera() {
if (mCamera != null) {
// need to SET NULL CB before stop preview!!!
mCamera.setPreviewCallback(null);
mCamera.stopPreview();
mCamera.release();
mCamera = null;
}
}
private void onGetYuvFrame(byte[] data) {
mEncoder.onGetYuvFrame(data);
}
@Override
public void onPreviewFrame(byte[] data, Camera c) {
// onGetYuvFrame(data);
//點選推流之後開始推流
if(isPublish){
onGetYuvFrame(data);
}
c.addCallbackBuffer(mYuvFrameBuffer);
}
private void onGetPcmFrame(byte[] pcmBuffer, int size) {
mEncoder.onGetPcmFrame(pcmBuffer, size);
}
//開始錄音
private void startAudio() {
if (mic != null) {
return;
}
int bufferSize = 2 * AudioRecord.getMinBufferSize(SrsEncoder.ASAMPLERATE, SrsEncoder.ACHANNEL, SrsEncoder.AFORMAT);
mic = new AudioRecord(MediaRecorder.AudioSource.MIC, SrsEncoder.ASAMPLERATE, SrsEncoder.ACHANNEL, SrsEncoder.AFORMAT, bufferSize);
mic.startRecording();
byte pcmBuffer[] = new byte[4096];
while (isPublish && !Thread.interrupted()) {
int size = mic.read(pcmBuffer, 0, pcmBuffer.length);
if (size <= 0) {
Log.e(TAG, "***** audio ignored, no data to read.");
break;
}
onGetPcmFrame(pcmBuffer, size);
}
}
private void stopAudio() {
isPublish = false;
if (aworker != null) {
Log.i(TAG, "stop audio worker thread");
aworker.interrupt();
try {
aworker.join();
} catch (InterruptedException e) {
e.printStackTrace();
aworker.interrupt();
}
aworker = null;
}
if (mic != null) {
mic.setRecordPositionUpdateListener(null);
mic.stop();
mic.release();
mic = null;
}
}
//停止推流之後 預覽狀態不應該停 也就是說我們應該在destory中停止攝像頭 而不是在這裡
public void stopPublish() {
stopAudio();
// stopCamera();
mEncoder.stop();
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
}
public SrsEncoder mEncoder = new SrsEncoder(new RtmpPublisher.EventHandler() {
@Override
public void onRtmpConnecting(String msg) {
mNotifyMsg = msg;
mContext.runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(mContext, mNotifyMsg, Toast.LENGTH_SHORT).show();
}
});
}
@Override
public void onRtmpConnected(String msg) {
mNotifyMsg = msg;
mContext.runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(mContext, mNotifyMsg, Toast.LENGTH_SHORT).show();
}
});
}
@Override
public void onRtmpVideoStreaming(String msg) {
}
@Override
public void onRtmpAudioStreaming(String msg) {
}
@Override
public void onRtmpStopped(String msg) {
mNotifyMsg = msg;
mContext.runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(mContext, mNotifyMsg, Toast.LENGTH_SHORT).show();
}
});
}
@Override
public void onRtmpDisconnected(String msg) {
mNotifyMsg = msg;
mContext.runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(mContext, mNotifyMsg, Toast.LENGTH_SHORT).show();
}
});
}
@Override
public void onRtmpOutputFps(final double fps) {
Log.i(TAG, String.format("Output Fps: %f", fps));
}
});
}
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CameraPreview繼承自SurfaceView並且實現了SurfaceHolder.Callback和 Camera.PreviewCallback兩個介面。
SurfaceHolder.Callback用於監聽SurfaceView的建立、改變、銷燬等操作，本來應該在這裡完成對攝像頭的init和release等操作，這裡偷了個懶。
Camera.PreviewCallback用於接收camera的預覽，對應onPreviewFrame()方法，我們可以在這裡對攝像頭傳回的資料做一些自己需要的處理，我們在這裡呼叫了另外的類對我們攝像頭傳回的資料進行了YUV編碼。