Exoplayer自适应hls流
Exoplayer adaptive hls streaming
我正在寻找简单易用的 example/explanation 如何为 HLS Adaptive 流式传输实现 ExoPlayer。我是新手，没有经验和知识，所以我可以从 git.
上的代码示例中了解如何执行此操作
太多了'moving parts'所以初学者可以理解并在自己的项目中重用它。
有人可以帮助我学习和理解如何 use/implement ExoPlayer 以实现此功能吗？
谢谢！
开始使用 ExoPlayer 的最简单方法是将其添加为 gradle 依赖项。您需要确保在项目根目录中的 build.gradle 文件中包含 jcenter 存储库：
repositories {
jcenter()
}
接下来，在模块的 build.gradle 文件中包含以下内容：
compile 'com.google.android.exoplayer:exoplayer:r2.2.0'
1。您的布局文件
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
android:id="@+id/activity_main"
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.google.android.exoplayer2.ui.SimpleExoPlayerView
android:id="@+id/player_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:focusable="true"
app:resize_mode="fill"/>
<ProgressBar
android:id="@+id/progressBar"
style="?android:attr/progressBarStyle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:visibility="gone"/>
</FrameLayout>
2。你的 Class 文件(Activity)
public class VideoPlayerActivity extends AppCompatActivity implements ExoPlayer.EventListener {
private SimpleExoPlayerView simpleExoPlayerView;
private String hlsVideoUri = "http://playertest.longtailvideo.com/adaptive/bbbfull/bbbfull.m3u8";
private SimpleExoPlayer player;
private ProgressBar progressBar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_video_player);
// 1. Create a default TrackSelector
Handler mainHandler = new Handler();
BandwidthMeter bandwidthMeter = new DefaultBandwidthMeter();
TrackSelection.Factory videoTrackSelectionFactory = new AdaptiveVideoTrackSelection.Factory(bandwidthMeter);
TrackSelector trackSelector = new DefaultTrackSelector(videoTrackSelectionFactory);
// 2. Create a default LoadControl
LoadControl loadControl = new DefaultLoadControl();
// 3. Create the player
player = ExoPlayerFactory.newSimpleInstance(this, trackSelector, loadControl);
simpleExoPlayerView = (SimpleExoPlayerView) findViewById(R.id.player_view);
simpleExoPlayerView.setPlayer(player);
// Measures bandwidth during playback. Can be null if not required.
DefaultBandwidthMeter defaultBandwidthMeter = new DefaultBandwidthMeter();
// Produces DataSource instances through which media data is loaded.
DataSource.Factory dataSourceFactory = new DefaultDataSourceFactory(this,
Util.getUserAgent(this, "Exo2"), defaultBandwidthMeter);
// Produces Extractor instances for parsing the media data.
ExtractorsFactory extractorsFactory = new DefaultExtractorsFactory();
// This is the MediaSource representing the media to be played.
HlsMediaSource hlsMediaSource = new HlsMediaSource(Uri.parse(hlsVideoUri), dataSourceFactory, mainHandler, new AdaptiveMediaSourceEventListener() {
@Override
public void onLoadStarted(DataSpec dataSpec, int dataType, int trackType, Format trackFormat, int trackSelectionReason, Object trackSelectionData, long mediaStartTimeMs, long mediaEndTimeMs, long elapsedRealtimeMs) {
}
@Override
public void onLoadCompleted(DataSpec dataSpec, int dataType, int trackType, Format trackFormat, int trackSelectionReason, Object trackSelectionData, long mediaStartTimeMs, long mediaEndTimeMs, long elapsedRealtimeMs, long loadDurationMs, long bytesLoaded) {
}
@Override
public void onLoadCanceled(DataSpec dataSpec, int dataType, int trackType, Format trackFormat, int trackSelectionReason, Object trackSelectionData, long mediaStartTimeMs, long mediaEndTimeMs, long elapsedRealtimeMs, long loadDurationMs, long bytesLoaded) {
}
@Override
public void onLoadError(DataSpec dataSpec, int dataType, int trackType, Format trackFormat, int trackSelectionReason, Object trackSelectionData, long mediaStartTimeMs, long mediaEndTimeMs, long elapsedRealtimeMs, long loadDurationMs, long bytesLoaded, IOException error, boolean wasCanceled) {
}
@Override
public void onUpstreamDiscarded(int trackType, long mediaStartTimeMs, long mediaEndTimeMs) {
}
@Override
public void onDownstreamFormatChanged(int trackType, Format trackFormat, int trackSelectionReason, Object trackSelectionData, long mediaTimeMs) {
}
});
player.addListener(this);
player.prepare(hlsMediaSource);
simpleExoPlayerView.requestFocus();
player.setPlayWhenReady(true);
progressBar = (ProgressBar) findViewById(R.id.progressBar);
}
@Override
public void onTimelineChanged(Timeline timeline, Object manifest) {
}
@Override
public void onTracksChanged(TrackGroupArray trackGroups, TrackSelectionArray trackSelections) {
}
@Override
public void onLoadingChanged(boolean isLoading) {
}
@Override
public void onPlayerStateChanged(boolean playWhenReady, int playbackState) {
switch (playbackState) {
case Player.STATE_BUFFERING:
//You can use progress dialog to show user that video is preparing or buffering so please wait
progressBar.setVisibility(View.VISIBLE);
break;
case Player.STATE_IDLE:
//idle state
break;
case Player.STATE_READY:
// dismiss your dialog here because our video is ready to play now
progressBar.setVisibility(View.GONE);
break;
case Player.STATE_ENDED:
// do your processing after ending of video
break;
}
}
@Override
public void onPlayerError(ExoPlaybackException error) {
AlertDialog.Builder adb = new AlertDialog.Builder(VideoPlayerActivity.this);
adb.setTitle("Could not able to stream video");
adb.setMessage("It seems that something is going wrong.\nPlease try again.");
adb.setPositiveButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
finish(); // take out user from this activity. you can skip this
}
});
AlertDialog ad = adb.create();
ad.show();
}
@Override
public void onPositionDiscontinuity() {
}
@Override
protected void onPause() {
super.onPause();
if (player != null) {
player.setPlayWhenReady(false); //to pause a video because now our video player is not in focus
}
}
@Override
protected void onDestroy() {
super.onDestroy();
player.release();
}
}
我觉得这对初学者来说已经足够了。还要记住，这个库的标准音频和视频组件依赖于 Android 的 MediaCodec API，它在 Android 4.1（API 级别 16）中发布。所以它不适用于 android 4.0 及以下版本。
不要忘记将此权限添加到 manifest file :
<uses-permission android:name="android.permission.INTERNET"/>
@Vicky 的回答可以，但有一个缺陷。
您传递给轨道选择器的带宽表必须与数据源工厂使用的相同。数据源工厂通过调用BW meter方法维护带宽估计，自适应轨道选择过程获得估计来决定适应哪个轨道。
如果它们不是同一个实例，自适应选择总是将 -1 作为 BW，并选择一些中间立场选项。
演示 ExoPlayer 应用程序也存在此缺陷。他们将 false 传递给 buildDataSource() 中的 useBwMeter，这意味着不更新 BW 估计 编辑：实际上，此 BW 仪表用于清单加载程序。不需要使用BW计。
我正在寻找简单易用的 example/explanation 如何为 HLS Adaptive 流式传输实现 ExoPlayer。我是新手，没有经验和知识，所以我可以从 git.
太多了'moving parts'所以初学者可以理解并在自己的项目中重用它。
有人可以帮助我学习和理解如何 use/implement ExoPlayer 以实现此功能吗？
谢谢！
开始使用 ExoPlayer 的最简单方法是将其添加为 gradle 依赖项。您需要确保在项目根目录中的 build.gradle 文件中包含 jcenter 存储库：
repositories {
jcenter()
}
接下来，在模块的 build.gradle 文件中包含以下内容：
compile 'com.google.android.exoplayer:exoplayer:r2.2.0'
1。您的布局文件
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
android:id="@+id/activity_main"
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.google.android.exoplayer2.ui.SimpleExoPlayerView
android:id="@+id/player_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:focusable="true"
app:resize_mode="fill"/>
<ProgressBar
android:id="@+id/progressBar"
style="?android:attr/progressBarStyle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:visibility="gone"/>
</FrameLayout>
2。你的 Class 文件(Activity)
public class VideoPlayerActivity extends AppCompatActivity implements ExoPlayer.EventListener {
private SimpleExoPlayerView simpleExoPlayerView;
private String hlsVideoUri = "http://playertest.longtailvideo.com/adaptive/bbbfull/bbbfull.m3u8";
private SimpleExoPlayer player;
private ProgressBar progressBar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_video_player);
// 1. Create a default TrackSelector
Handler mainHandler = new Handler();
BandwidthMeter bandwidthMeter = new DefaultBandwidthMeter();
TrackSelection.Factory videoTrackSelectionFactory = new AdaptiveVideoTrackSelection.Factory(bandwidthMeter);
TrackSelector trackSelector = new DefaultTrackSelector(videoTrackSelectionFactory);
// 2. Create a default LoadControl
LoadControl loadControl = new DefaultLoadControl();
// 3. Create the player
player = ExoPlayerFactory.newSimpleInstance(this, trackSelector, loadControl);
simpleExoPlayerView = (SimpleExoPlayerView) findViewById(R.id.player_view);
simpleExoPlayerView.setPlayer(player);
// Measures bandwidth during playback. Can be null if not required.
DefaultBandwidthMeter defaultBandwidthMeter = new DefaultBandwidthMeter();
// Produces DataSource instances through which media data is loaded.
DataSource.Factory dataSourceFactory = new DefaultDataSourceFactory(this,
Util.getUserAgent(this, "Exo2"), defaultBandwidthMeter);
// Produces Extractor instances for parsing the media data.
ExtractorsFactory extractorsFactory = new DefaultExtractorsFactory();
// This is the MediaSource representing the media to be played.
HlsMediaSource hlsMediaSource = new HlsMediaSource(Uri.parse(hlsVideoUri), dataSourceFactory, mainHandler, new AdaptiveMediaSourceEventListener() {
@Override
public void onLoadStarted(DataSpec dataSpec, int dataType, int trackType, Format trackFormat, int trackSelectionReason, Object trackSelectionData, long mediaStartTimeMs, long mediaEndTimeMs, long elapsedRealtimeMs) {
}
@Override
public void onLoadCompleted(DataSpec dataSpec, int dataType, int trackType, Format trackFormat, int trackSelectionReason, Object trackSelectionData, long mediaStartTimeMs, long mediaEndTimeMs, long elapsedRealtimeMs, long loadDurationMs, long bytesLoaded) {
}
@Override
public void onLoadCanceled(DataSpec dataSpec, int dataType, int trackType, Format trackFormat, int trackSelectionReason, Object trackSelectionData, long mediaStartTimeMs, long mediaEndTimeMs, long elapsedRealtimeMs, long loadDurationMs, long bytesLoaded) {
}
@Override
public void onLoadError(DataSpec dataSpec, int dataType, int trackType, Format trackFormat, int trackSelectionReason, Object trackSelectionData, long mediaStartTimeMs, long mediaEndTimeMs, long elapsedRealtimeMs, long loadDurationMs, long bytesLoaded, IOException error, boolean wasCanceled) {
}
@Override
public void onUpstreamDiscarded(int trackType, long mediaStartTimeMs, long mediaEndTimeMs) {
}
@Override
public void onDownstreamFormatChanged(int trackType, Format trackFormat, int trackSelectionReason, Object trackSelectionData, long mediaTimeMs) {
}
});
player.addListener(this);
player.prepare(hlsMediaSource);
simpleExoPlayerView.requestFocus();
player.setPlayWhenReady(true);
progressBar = (ProgressBar) findViewById(R.id.progressBar);
}
@Override
public void onTimelineChanged(Timeline timeline, Object manifest) {
}
@Override
public void onTracksChanged(TrackGroupArray trackGroups, TrackSelectionArray trackSelections) {
}
@Override
public void onLoadingChanged(boolean isLoading) {
}
@Override
public void onPlayerStateChanged(boolean playWhenReady, int playbackState) {
switch (playbackState) {
case Player.STATE_BUFFERING:
//You can use progress dialog to show user that video is preparing or buffering so please wait
progressBar.setVisibility(View.VISIBLE);
break;
case Player.STATE_IDLE:
//idle state
break;
case Player.STATE_READY:
// dismiss your dialog here because our video is ready to play now
progressBar.setVisibility(View.GONE);
break;
case Player.STATE_ENDED:
// do your processing after ending of video
break;
}
}
@Override
public void onPlayerError(ExoPlaybackException error) {
AlertDialog.Builder adb = new AlertDialog.Builder(VideoPlayerActivity.this);
adb.setTitle("Could not able to stream video");
adb.setMessage("It seems that something is going wrong.\nPlease try again.");
adb.setPositiveButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
finish(); // take out user from this activity. you can skip this
}
});
AlertDialog ad = adb.create();
ad.show();
}
@Override
public void onPositionDiscontinuity() {
}
@Override
protected void onPause() {
super.onPause();
if (player != null) {
player.setPlayWhenReady(false); //to pause a video because now our video player is not in focus
}
}
@Override
protected void onDestroy() {
super.onDestroy();
player.release();
}
}
我觉得这对初学者来说已经足够了。还要记住，这个库的标准音频和视频组件依赖于 Android 的 MediaCodec API，它在 Android 4.1（API 级别 16）中发布。所以它不适用于 android 4.0 及以下版本。
不要忘记将此权限添加到 manifest file :
<uses-permission android:name="android.permission.INTERNET"/>
@Vicky 的回答可以，但有一个缺陷。
您传递给轨道选择器的带宽表必须与数据源工厂使用的相同。数据源工厂通过调用BW meter方法维护带宽估计，自适应轨道选择过程获得估计来决定适应哪个轨道。
如果它们不是同一个实例，自适应选择总是将 -1 作为 BW，并选择一些中间立场选项。
演示 ExoPlayer 应用程序也存在此缺陷。他们将 false 传递给 buildDataSource() 中的 useBwMeter，这意味着不更新 BW 估计 编辑：实际上，此 BW 仪表用于清单加载程序。不需要使用BW计。