我正在使用 mrmaffen 的 VLC-ANDROID-SDK 开发 RTSP 流媒体应用。 https://github.com/mrmaffen/vlc-android-sdk
我在让它工作和运行良好方面取得了很大的成功，但我遇到的一个我似乎无法动摇的问题是让它在 SurfaceView 上全屏显示视频源，甚至就在 SurfaceView 的中心。
这是我得到的：
黑色窗口是屏幕的总大小，我希望该视频填满屏幕并希望始终从中心填充，但我不知道该怎么做。
任何人都有过类似的经历并且知道如何解决它？
【问题讨论】：
标签： android android-studio fullscreen rtsp libvlc
我有点解决了这个问题，但以一种有点狡猾的方式，它远未完成，但考虑到缺乏关于该主题的知识和信息，我认为这可能暂时对某人有所帮助。
解释每个任务：
设置你的全局变量：
public class SingleStreamView extends AppCompatActivity implements
IVLCVout.Callback {
public int mHeight;
public int mWidth;
其次，在 onCreate 任务中找到您设备的屏幕尺寸：
DisplayMetrics displayMetrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);
mHeight = displayMetrics.heightPixels;
mWidth = displayMetrics.widthPixels;
2。 然后转到您的“CreatePlayer”事件和您设置视频输出的位置：
// Set up video output
final IVLCVout vout = mMediaPlayer.getVLCVout();
vout.setVideoView(mSurface);
vout.setWindowSize(mWidth,mHeight);
vout.addCallback(this);
vout.attachViews();
使它在我的表面居中的获胜线是“vout.setWindowSize(mWidth,mHeight);”
然后我简单地使用 setscale 选项“全屏”播放视频。也就是说，这是一种hack的方法，我想尝试找出一种方法来获取编解码器信息，以便动态设置视频的比例，并且自动设置这种方式全屏各种尺寸的视频流到任何尺寸的屏幕，但目前这适用于已知的视频流分辨率，它会自动调整到您手机的屏幕尺寸。
无论哪种方式，我发现对于三星 Galaxy s8，640x480p RTSP 流的良好缩放因子是 1.8。编码如下：
Media m = new Media(libvlc, Uri.parse(RTSP_ADDRESS));
m.setHWDecoderEnabled(true,false);
m.addOption(":network-caching=100");
m.addOption(":clock-jitter=0");
m.addOption(":clock-synchro=0");
m.addOption(":fullscreen");
mMediaPlayer.setMedia(m);
mMediaPlayer.setAspectRatio("16:9");
mMediaPlayer.setScale(1.8f);
mMediaPlayer.play();
你在哪里得到“mMediaPlayer.setScale(1.8f);”
希望这对某人有所帮助！
【讨论】：
您的解决方案似乎很有趣，但我也面临同样的问题，我似乎（还）无法用您的方法解决。
我目前所获得的屏幕截图可以在以下位置看到： https://photos.app.goo.gl/9nKo22Mkc2SZq4SK9
我还想（垂直）在 Samsung-XCover4（720x1280 像素）和最小分辨率为 320x480 的设备上以横向/纵向模式将 rtsp-video-stream 居中。我希望它运行的最低 Android SDK 版本是 API-22 (Android 5.1.1)。 我让（嵌入式）VLC 播放器工作的 libvlc 代码基于 'de.mrmaffen:libvlc-android:2.1.12@aar'。
鉴于上述“要求”，您可以在屏幕截图中看到以下行为。前两个屏幕截图位于 Samsung-XCover4 (720x1280) 上，您可以在其中看到 device-orientation=landscape 剪辑视频并且不缩放，而第 3 和第 4 个屏幕截图显示相同的视频流不跟随在具有小分辨率的设备上使用 SURFACE_BEST_FIT 方法（请参阅下面的代码以获取解释）。 我很想看到一个 updateVideoSurfaces 来处理设备方向的变化，或者至少在启动时显示整个视频。
我的 VLC-video-player（垂直 LinearLayout 的一部分）的布局如下：
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="0.3"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:orientation="vertical">
<FrameLayout
android:id="@+id/video_surface_frame"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center"
android:foregroundGravity="clip_horizontal|clip_vertical"
tools:ignore="true">
<ViewStub
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout="@layout/surface_view"
android:id="@+id/surface_stub" />
<ViewStub
android:layout_width="1dp"
android:layout_height="1dp"
android:layout="@layout/surface_view"
android:id="@+id/subtitles_surface_stub" />
<ViewStub
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout="@layout/texture_view"
android:id="@+id/texture_stub" />
</FrameLayout>
</LinearLayout>
我从 de.mrmaffen 获得的示例代码使用了一个 updateVideoSurfaces（参见下面的 java 代码），它使用了一些 SURFACE_XX 方法，在我看来，这些方法涵盖了具有不同设备方向和分辨率的所有场景。
出于某种原因，我无法弄清楚为什么这不起作用，并且我怀疑我用于播放器的布局（FrameLayout/ViewStub's）可能会导致问题。
我想知道您是否可以阐明一些方向，以确保视频流将自动缩放/居中于任何设备方向/分辨率。
我使用的播放器代码如下：
package com.testing.vlc2player;
import ...
public class VLC2PlayerActivity extends AppCompatActivity implements IVLCVout.OnNewVideoLayoutListener,
IVLCVout.Callback {
private static final Logger log = LoggerFactory.getLogger(VLC2PlayerActivity.class);
private static final boolean USE_SURFACE_VIEW = true;
private static final boolean ENABLE_SUBTITLES = false;
private static final int SURFACE_BEST_FIT = 0;
private static final int SURFACE_FIT_SCREEN = 1;
private static final int SURFACE_FILL = 2;
private static final int SURFACE_16_9 = 3;
private static final int SURFACE_4_3 = 4;
private static final int SURFACE_ORIGINAL = 5;
private static final int CURRENT_SIZE = SURFACE_BEST_FIT;
private FrameLayout mVideoSurfaceFrame = null;
private SurfaceView mVideoSurface = null;
private SurfaceView mSubtitlesSurface = null;
private TextureView mVideoTexture = null;
private View mVideoView = null;
private final Handler mHandler = new Handler();
private View.OnLayoutChangeListener mOnLayoutChangeListener = null;
private LibVLC mLibVLC = null;
private MediaPlayer mMediaPlayer = null;
private int mVideoHeight = 0;
private int mVideoWidth = 0;
private int mVideoVisibleHeight = 0;
private int mVideoVisibleWidth = 0;
private int mVideoSarNum = 0;
private int mVideoSarDen = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_video_player);
setupVLCLayout();
}
private void setupVLCLayout() {
log.debug("...");
final ArrayList<String> args = new ArrayList<>();
args.add("-vvv");
mLibVLC = new LibVLC(this, args);
mMediaPlayer = new MediaPlayer(mLibVLC);
mVideoSurfaceFrame = findViewById(R.id.video_surface_frame);
if (USE_SURFACE_VIEW) {
ViewStub stub = findViewById(R.id.surface_stub);
mVideoSurface = (SurfaceView) stub.inflate();
if (ENABLE_SUBTITLES) {
stub = findViewById(R.id.subtitles_surface_stub);
mSubtitlesSurface = (SurfaceView) stub.inflate();
mSubtitlesSurface.setZOrderMediaOverlay(true);
mSubtitlesSurface.getHolder().setFormat(PixelFormat.TRANSLUCENT);
}
mVideoView = mVideoSurface;
} else {
ViewStub stub = findViewById(R.id.texture_stub);
mVideoTexture = (TextureView) stub.inflate();
mVideoView = mVideoTexture;
}
}
@Override
protected void onDestroy() {
super.onDestroy();
mMediaPlayer.release();
mLibVLC.release();
}
@Override
protected void onStart() {
super.onStart();
final IVLCVout vlcVout = mMediaPlayer.getVLCVout();
if (mVideoSurface != null) {
vlcVout.setVideoView(mVideoSurface);
if (mSubtitlesSurface != null) {
vlcVout.setSubtitlesView(mSubtitlesSurface);
}
} else {
vlcVout.setVideoView(mVideoTexture);
}
vlcVout.attachViews(this);
String url = getString(R.string.videoURL);
Uri uri = Uri.parse(url);
final Media media = new Media(mLibVLC, uri);
mMediaPlayer.setMedia(media);
media.release();
mMediaPlayer.play();
if (mOnLayoutChangeListener == null) {
mOnLayoutChangeListener = new View.OnLayoutChangeListener() {
private final Runnable mRunnable = new Runnable() {
@Override
public void run() {
updateVideoSurfaces();
}
};
@Override
public void onLayoutChange(View v, int left, int top, int right,
int bottom, int oldLeft, int oldTop, int oldRight, int oldBottom) {
if (left != oldLeft || top != oldTop || right != oldRight || bottom != oldBottom) {
mHandler.removeCallbacks(mRunnable);
mHandler.post(mRunnable);
}
}
};
}
mVideoSurfaceFrame.addOnLayoutChangeListener(mOnLayoutChangeListener);
}
@Override
protected void onStop() {
super.onStop();
if (mOnLayoutChangeListener != null) {
mVideoSurfaceFrame.removeOnLayoutChangeListener(mOnLayoutChangeListener);
mOnLayoutChangeListener = null;
}
mMediaPlayer.stop();
mMediaPlayer.getVLCVout().detachViews();
}
private void changeMediaPlayerLayout(int displayW, int displayH) {
log.debug("displayW={}, displayH={}", displayW, displayH);
/* Change the video placement using the MediaPlayer API */
int dispWd = displayW;
int dispHt = displayH;
dispWd = mVideoSurface.getWidth(); //Note: we do NOT want to use the entire display!
dispHt = mVideoSurface.getHeight();
switch (CURRENT_SIZE) {
case SURFACE_BEST_FIT:
mMediaPlayer.setAspectRatio(null);
mMediaPlayer.setScale(0);
break;
case SURFACE_FIT_SCREEN:
case SURFACE_FILL: {
Media.VideoTrack vtrack = mMediaPlayer.getCurrentVideoTrack();
if (vtrack == null) {
return;
}
final boolean videoSwapped = vtrack.orientation == Media.VideoTrack.Orientation.LeftBottom
|| vtrack.orientation == Media.VideoTrack.Orientation.RightTop;
if (CURRENT_SIZE == SURFACE_FIT_SCREEN) {
int videoW = vtrack.width;
int videoH = vtrack.height;
if (videoSwapped) {
int swap = videoW;
videoW = videoH;
videoH = swap;
}
if (vtrack.sarNum != vtrack.sarDen) {
videoW = videoW * vtrack.sarNum / vtrack.sarDen;
}
float ar = videoW / (float) videoH;
float dar = dispWd / (float) dispHt;
//noinspection unused
float scale;
if (dar >= ar) {
scale = dispWd / (float) videoW; /* horizontal */
} else {
scale = dispHt / (float) videoH; /* vertical */
}
log.debug("scale={}", scale);
mMediaPlayer.setScale(scale);
mMediaPlayer.setAspectRatio(null);
} else {
mMediaPlayer.setScale(0);
mMediaPlayer.setAspectRatio(!videoSwapped ? ""+dispWd+":"+dispHt
: ""+dispHt+":"+dispWd);
}
break;
}
case SURFACE_16_9:
mMediaPlayer.setAspectRatio("16:9");
mMediaPlayer.setScale(0);
break;
case SURFACE_4_3:
mMediaPlayer.setAspectRatio("4:3");
mMediaPlayer.setScale(0);
break;
case SURFACE_ORIGINAL:
mMediaPlayer.setAspectRatio(null);
mMediaPlayer.setScale(1);
break;
}
}
private void updateVideoSurfaces() {
log.debug("...");
int sw = getWindow().getDecorView().getWidth();
int sh = getWindow().getDecorView().getHeight();
// sanity check
if (sw * sh == 0) {
log.error("Invalid surface size");
return;
}
mMediaPlayer.getVLCVout().setWindowSize(sw, sh);
ViewGroup.LayoutParams lp = mVideoView.getLayoutParams();
if (mVideoWidth * mVideoHeight == 0) {
/* Case of OpenGL vouts: handles the placement of the video using MediaPlayer API */
lp.width = ViewGroup.LayoutParams.MATCH_PARENT;
lp.height = ViewGroup.LayoutParams.MATCH_PARENT;
mVideoView.setLayoutParams(lp);
lp = mVideoSurfaceFrame.getLayoutParams();
lp.width = ViewGroup.LayoutParams.MATCH_PARENT;
lp.height = ViewGroup.LayoutParams.MATCH_PARENT;
mVideoSurfaceFrame.setLayoutParams(lp);
changeMediaPlayerLayout(sw, sh);
return;
}
if (lp.width == lp.height && lp.width == ViewGroup.LayoutParams.MATCH_PARENT) {
/* We handle the placement of the video using Android View LayoutParams */
mMediaPlayer.setAspectRatio(null);
mMediaPlayer.setScale(0);
}
double dw = sw, dh = sh;
final boolean isPortrait = getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT;
if (sw > sh && isPortrait || sw < sh && !isPortrait) {
dw = sh;
dh = sw;
}
// compute the aspect ratio
double ar, vw;
if (mVideoSarDen == mVideoSarNum) {
/* No indication about the density, assuming 1:1 */
vw = mVideoVisibleWidth;
ar = (double)mVideoVisibleWidth / (double)mVideoVisibleHeight;
} else {
/* Use the specified aspect ratio */
vw = mVideoVisibleWidth * (double)mVideoSarNum / mVideoSarDen;
ar = vw / mVideoVisibleHeight;
}
// compute the display aspect ratio
double dar = dw / dh;
switch (CURRENT_SIZE) {
case SURFACE_BEST_FIT:
if (dar < ar) {
dh = dw / ar;
} else {
dw = dh * ar;
}
break;
case SURFACE_FIT_SCREEN:
if (dar >= ar) {
dh = dw / ar; /* horizontal */
} else {
dw = dh * ar; /* vertical */
}
break;
case SURFACE_FILL:
break;
case SURFACE_16_9:
ar = 16.0 / 9.0;
if (dar < ar) {
dh = dw / ar;
} else {
dw = dh * ar;
}
break;
case SURFACE_4_3:
ar = 4.0 / 3.0;
if (dar < ar) {
dh = dw / ar;
} else {
dw = dh * ar;
}
break;
case SURFACE_ORIGINAL:
dh = mVideoVisibleHeight;
dw = vw;
break;
}
// set display size
lp.width = (int) Math.ceil(dw * mVideoWidth / mVideoVisibleWidth);
lp.height = (int) Math.ceil(dh * mVideoHeight / mVideoVisibleHeight);
mVideoView.setLayoutParams(lp);
if (mSubtitlesSurface != null) {
mSubtitlesSurface.setLayoutParams(lp);
}
// set frame size (crop if necessary)
lp = mVideoSurfaceFrame.getLayoutParams();
lp.width = (int) Math.floor(dw);
lp.height = (int) Math.floor(dh);
mVideoSurfaceFrame.setLayoutParams(lp);
mVideoView.invalidate();
if (mSubtitlesSurface != null) {
mSubtitlesSurface.invalidate();
}
}
@TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR1)
@Override
public void onNewVideoLayout(IVLCVout vlcVout, int width, int height,
int visibleWidth, int visibleHeight,
int sarNum, int sarDen) {
log.debug("...");
mVideoWidth = width;
mVideoHeight = height;
mVideoVisibleWidth = visibleWidth;
mVideoVisibleHeight = visibleHeight;
mVideoSarNum = sarNum;
mVideoSarDen = sarDen;
updateVideoSurfaces();
}
@Override
public void onSurfacesCreated(IVLCVout vlcVout) {
log.debug("vlcVout={}", vlcVout);
}
/**
* This callback is called when surfaces are destroyed.
*/
public void onSurfacesDestroyed(IVLCVout vlcVout) {
log.debug("vlcVout={}", vlcVout);
}
public void onStopClientMonitoring(View view) {
// log.info("UI -> Stop monitoring clientId= ...");
// onBackPressed();
String androidSDKRelease = Build.VERSION.RELEASE;
int androidSDKInt = Build.VERSION.SDK_INT;
String androidInfo = String.format(Locale.getDefault(), "Android %s (Version %d)", androidSDKRelease, androidSDKInt);
String appVersionName = BuildConfig.VERSION_NAME;
String appName = getString(R.string.app_name);
String appInfoTitle = String.format(getString(R.string.app_info_title), appName);
String infoMsg = String.format(getString(R.string.app_info_message), appVersionName, androidInfo);
new AlertDialog.Builder(this).setTitle(appInfoTitle)
.setMessage(infoMsg)
.setPositiveButton(getString(R.string.button_ok), new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// Dismiss dialog
dialog.dismiss();
}
})
.create()
.show();
}
}
【讨论】：