前言
在 从零开始，手把手教你如何在Ubuntu下编译VLC-Android源码 文章中为大家讲解了如何在Ubuntu环境下编译VLC-Android源码，这篇文章就为大家讲解如何使用编译好的 libvlc-3.0.0.aar 包来编写一个视频播放器 项目源代码。
代码实现
build.gradle 中配置使用 libvlc-3.0.0.aar 包
//---1、---
repositories{
flatDir{
dirs 'libs'
}
}
dependencies {
...
//---2、---
compile(name:'libvlc-3.0.0',ext:'aar')
}
界面布局很简单，一个FrameLayout中嵌套一个SurfaceView。
布局实现
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/ll_vlc"
android:layout_width="match_parent"
android:layout_height="match_parent">
<SurfaceView
android:id="@+id/surface_view"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</FrameLayout>
Activity或者Fragment要实现 IVLCVout.OnNewVideoLayoutListener 接口，实现 onNewVideoLayout方法，在 onNewVideoLayout 方法中根据屏幕大小来动态控制视频播放显示区域大小。
代码实现
public class VLCActivity extends BaseActivityForFullScreen implements IVLCVout.OnNewVideoLayoutListener {
private static final String SAMPLE_URL = "http://download.blender.org/peach/bigbuckbunny_movies/BigBuckBunny_640x360.m4v";
SurfaceView surfaceView = null;
FrameLayout frameLayout = null;
LibVLC mLibVLC = null;
MediaPlayer mMediaPlayer = null;
IVLCVout mIVLCVout = null;
View.OnLayoutChangeListener onLayoutChangeListener = null;
Handler handler = new Handler();
int mVideoHeight = 0;
int mVideoWidth = 0;
int mVideoVisibleHeight = 0;
int mVideoVisibleWidth = 0;
int mVideoSarNum = 0;
int mVideoSarDen = 0;
static final int SURFACE_BEST_FIT = 0;
static final int SURFACE_FIT_SCREEN = 1;
static final int SURFACE_FILL = 2;
static final int SURFACE_16_9 = 3;
static final int SURFACE_4_3 = 4;
static final int SURFACE_ORIGINAL = 5;
static int CURRENT_SIZE = SURFACE_BEST_FIT;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_vlc);
surfaceView = (SurfaceView) findViewById(R.id.surface_view);
frameLayout = (FrameLayout) findViewById(R.id.ll_vlc);
mLibVLC = new LibVLC(this);
mMediaPlayer = new MediaPlayer(mLibVLC);
mIVLCVout = mMediaPlayer.getVLCVout();
if (surfaceView != null) {
mIVLCVout.setVideoView(surfaceView);
}
mIVLCVout.attachViews();
Media media = new Media(mLibVLC, Uri.parse(SAMPLE_URL));
mMediaPlayer.setMedia(media);
media.release();
mMediaPlayer.play();
if (onLayoutChangeListener == null) {
onLayoutChangeListener = new View.OnLayoutChangeListener() {
private final Runnable runnable = new Runnable() {
@Override
public void run() {
updateVideoSurfaces();
}
};
@Override
public void onLayoutChange(View view, 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) {
handler.removeCallbacks(runnable);
handler.post(runnable);
}
}
};
}
frameLayout.addOnLayoutChangeListener(onLayoutChangeListener);
}
private void changeMediaPlayerLayout(int displayW, int displayH) {
/* Change the video placement using the MediaPlayer API */
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 = displayW / (float) displayH;
float scale;
if (dar >= ar)
scale = displayW / (float) videoW; /* horizontal */
else
scale = displayH / (float) videoH; /* vertical */
mMediaPlayer.setScale(scale);
mMediaPlayer.setAspectRatio(null);
} else {
mMediaPlayer.setScale(0);
mMediaPlayer.setAspectRatio(!videoSwapped ? "" + displayW + ":" + displayH
: "" + displayH + ":" + displayW);
}
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() {
int sw = getWindow().getDecorView().getWidth();
int sh = getWindow().getDecorView().getHeight();
// sanity check
if (sw * sh == 0) {
return;
}
mMediaPlayer.getVLCVout().setWindowSize(sw, sh);
ViewGroup.LayoutParams lp = surfaceView.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;
surfaceView.setLayoutParams(lp);
lp = frameLayout.getLayoutParams();
lp.width = ViewGroup.LayoutParams.MATCH_PARENT;
lp.height = ViewGroup.LayoutParams.MATCH_PARENT;
frameLayout.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);
surfaceView.setLayoutParams(lp);
// set frame size (crop if necessary)
lp = frameLayout.getLayoutParams();
lp.width = (int) Math.floor(dw);
lp.height = (int) Math.floor(dh);
frameLayout.setLayoutParams(lp);
surfaceView.invalidate();
}
@Override
public void onNewVideoLayout(IVLCVout vlcVout, int width, int height, int visibleWidth,
int visibleHeight, int sarNum, int sarDen) {
mVideoWidth = width;
mVideoHeight = height;
mVideoVisibleWidth = visibleWidth;
mVideoVisibleHeight = visibleHeight;
mVideoSarNum = sarNum;
mVideoSarDen = sarDen;
updateVideoSurfaces();
}
@Override
protected void onStop() {
super.onStop();
if (onLayoutChangeListener != null) {
frameLayout.removeOnLayoutChangeListener(onLayoutChangeListener);
onLayoutChangeListener = null;
}
mMediaPlayer.stop();
mMediaPlayer.getVLCVout().detachViews();
}
@Override
protected void onDestroy() {
super.onDestroy();
mMediaPlayer.release();
mLibVLC.release();
}
}
写在最后
以上就是如何使用libvlc-3.0.0.aar包来实现自己的视频播放器。
如果你在参考过程中遇到问题，可以在我的联系方式中给我提问。
后面会继续介绍，Android的相关知识，欢迎继续关注我博客的更新。
转载请注明：XueLong的博客 » 基于VLC框架的Android视频播放器Demo
