我希望像YouTube支持使用Exoplayer 2一样实现质量再现选项，如（320p，480p，720p和1080p）。真的很努力寻找答案但却找不到任何答案。因为我是Exoplayer的新手，所以如果我能得到一些帮助就会很棒。
以下是MainActivity.java
package com.geoffledak.exoplayerfullscreen;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
private final String STATE_RESUME_WINDOW = "resumeWindow";
private final String STATE_RESUME_POSITION = "resumePosition";
private final String STATE_PLAYER_FULLSCREEN = "playerFullscreen";
private SimpleExoPlayerView mExoPlayerView;
private MediaSource mVideoSource;
private boolean mExoPlayerFullscreen = false;
private FrameLayout mFullScreenButton;
private ImageView mFullScreenIcon;
private ImageButton btn_settings;
private ExoPlayer player;
private Dialog mFullScreenDialog;
private int mResumeWindow;
private long mResumePosition;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn_settings = (ImageButton) findViewById(R.id.btn_settings);
btn_settings.setOnClickListener(this);
if (savedInstanceState != null) {
mResumeWindow = savedInstanceState.getInt(STATE_RESUME_WINDOW);
mResumePosition = savedInstanceState.getLong(STATE_RESUME_POSITION);
mExoPlayerFullscreen = savedInstanceState.getBoolean(STATE_PLAYER_FULLSCREEN);
}
}
@Override
public void onSaveInstanceState(Bundle outState) {
outState.putInt(STATE_RESUME_WINDOW, mResumeWindow);
outState.putLong(STATE_RESUME_POSITION, mResumePosition);
outState.putBoolean(STATE_PLAYER_FULLSCREEN, mExoPlayerFullscreen);
super.onSaveInstanceState(outState);
}
private void initFullscreenDialog() {
mFullScreenDialog = new Dialog(this, android.R.style.Theme_Black_NoTitleBar_Fullscreen) {
public void onBackPressed() {
if (mExoPlayerFullscreen)
closeFullscreenDialog();
super.onBackPressed();
}
};
}
private void openFullscreenDialog() {
((ViewGroup) mExoPlayerView.getParent()).removeView(mExoPlayerView);
mFullScreenDialog.addContentView(mExoPlayerView, new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
mFullScreenIcon.setImageDrawable(ContextCompat.getDrawable(MainActivity.this, R.drawable.ic_fullscreen_shrink));
mExoPlayerFullscreen = true;
mFullScreenDialog.show();
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
}
private void closeFullscreenDialog() {
((ViewGroup) mExoPlayerView.getParent()).removeView(mExoPlayerView);
((FrameLayout) findViewById(R.id.main_media_frame)).addView(mExoPlayerView);
mExoPlayerFullscreen = false;
mFullScreenDialog.dismiss();
mFullScreenIcon.setImageDrawable(ContextCompat.getDrawable(MainActivity.this, R.drawable.ic_fullscreen_expand));
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
}
private void initFullscreenButton() {
PlaybackControlView controlView = mExoPlayerView.findViewById(R.id.exo_controller);
mFullScreenIcon = controlView.findViewById(R.id.exo_fullscreen_icon);
mFullScreenButton = controlView.findViewById(R.id.exo_fullscreen_button);
mFullScreenButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (!mExoPlayerFullscreen)
openFullscreenDialog();
else
closeFullscreenDialog();
}
});
}
private void initExoPlayer() {
BandwidthMeter bandwidthMeter = new DefaultBandwidthMeter();
TrackSelection.Factory videoTrackSelectionFactory = new AdaptiveTrackSelection.Factory(bandwidthMeter);
TrackSelector trackSelector = new DefaultTrackSelector(videoTrackSelectionFactory);
LoadControl loadControl = new DefaultLoadControl();
SimpleExoPlayer player = ExoPlayerFactory.newSimpleInstance(new DefaultRenderersFactory(this), trackSelector, loadControl);
mExoPlayerView.setPlayer(player);
boolean haveResumePosition = mResumeWindow != C.INDEX_UNSET;
if (haveResumePosition) {
mExoPlayerView.getPlayer().seekTo(mResumeWindow, mResumePosition);
}
mExoPlayerView.getPlayer().prepare(mVideoSource);
mExoPlayerView.getPlayer().setPlayWhenReady(true);
}
@Override
protected void onResume() {
super.onResume();
if (mExoPlayerView == null) {
mExoPlayerView = (SimpleExoPlayerView) findViewById(R.id.exoplayer);
initFullscreenDialog();
initFullscreenButton();
String streamUrl = "http://playertest.longtailvideo.com/adaptive/bbbfull/bbbfull.m3u8";
String userAgent = Util.getUserAgent(MainActivity.this, getApplicationContext().getApplicationInfo().packageName);
DefaultHttpDataSourceFactory httpDataSourceFactory = new DefaultHttpDataSourceFactory(userAgent, null, DefaultHttpDataSource.DEFAULT_CONNECT_TIMEOUT_MILLIS, DefaultHttpDataSource.DEFAULT_READ_TIMEOUT_MILLIS, true);
DefaultDataSourceFactory dataSourceFactory = new DefaultDataSourceFactory(MainActivity.this, null, httpDataSourceFactory);
Uri daUri = Uri.parse(streamUrl);
mVideoSource = new HlsMediaSource(daUri, dataSourceFactory, 1, null, null);
}
initExoPlayer();
if (mExoPlayerFullscreen) {
((ViewGroup) mExoPlayerView.getParent()).removeView(mExoPlayerView);
mFullScreenDialog.addContentView(mExoPlayerView, new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
mFullScreenIcon.setImageDrawable(ContextCompat.getDrawable(MainActivity.this, R.drawable.ic_fullscreen_shrink));
mFullScreenDialog.show();
}
}
@Override
protected void onPause() {
super.onPause();
if (mExoPlayerView != null && mExoPlayerView.getPlayer() != null) {
mResumeWindow = mExoPlayerView.getPlayer().getCurrentWindowIndex();
mResumePosition = Math.max(0, mExoPlayerView.getPlayer().getContentPosition());
mExoPlayerView.getPlayer().release();
}
if (mFullScreenDialog != null)
mFullScreenDialog.dismiss();
}
@Override
public void onClick(View view) {
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
// Checks the orientation of the screen
if (newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE) {
Toast.makeText(this, "Landscape", Toast.LENGTH_SHORT).show();
} else if (newConfig.orientation == Configuration.ORIENTATION_PORTRAIT){
Toast.makeText(this, "Portrait", Toast.LENGTH_SHORT).show();
}
}
}
答案 0 :(得分：1)
您想要查看的核心点是轨道选择（通过TrackSelector）以及TrackSelectionHelper。我将在下面列出重要的代码示例，希望这些示例足以让您前进。但最终只需在演示应用程序中执行类似操作即可获得所需的位置。
您将保持启动播放器的轨道选择器，并将其用于几乎所有内容。
以下只是一段代码，理想地涵盖了您尝试做的事情的要点，因为演示看起来似乎使头发过于复杂。此外，我还没有运行代码，但它足够接近。
这是一个更多的描述。
我检查了解决方案here，我相信它会对你有帮助。
// These two could be fields OR passed around
int videoRendererIndex;
TrackGroupArray trackGroups;
// This is the body of the logic for see if there are even video tracks
// It also does some field setting
MappedTrackInfo mappedTrackInfo = trackSelector.getCurrentMappedTrackInfo();
for (int i = 0; i < mappedTrackInfo.length; i++) {
TrackGroupArray trackGroups = mappedTrackInfo.getTrackGroups(i);
if (trackGroups.length != 0) {
switch (player.getRendererType(i)) {
case C.TRACK_TYPE_VIDEO:
videoRendererIndex = i;
return true;
}
}
}
// This next part is actually about getting the list. It doesn't include
// some additional logic they put in for adaptive tracks (DASH/HLS/SS),
// but you can look at the sample for that (TrackSelectionHelper#buildView())
// Below you'd be building up items in a list. This just does
// views directly, but you could just have a list of track names (with indexes)
for (int groupIndex = 0; groupIndex < trackGroups.length; groupIndex++) {
TrackGroup group = trackGroups.get(groupIndex);
for (int trackIndex = 0; trackIndex < group.length; trackIndex++) {
if (trackIndex == 0) {
// Beginning of a new set, the demo app adds a divider
}
CheckedTextView trackView = ...; // The TextView to show in the list
// The below points to a util which extracts the quality from the TrackGroup
trackView.setText(DemoUtil.buildTrackName(group.getFormat(trackIndex)));
}
// Assuming you tagged the view with the groupIndex and trackIndex, you
// can build your override with that info.
Pair<Integer, Integer> tag = (Pair<Integer, Integer>) view.getTag();
int groupIndex = tag.first;
int trackIndex = tag.second;
// This is the override you'd use for something that isn't adaptive.
override = new SelectionOverride(FIXED_FACTORY, groupIndex, trackIndex);
// Otherwise they call their helper for adaptives, which roughly does:
int[] tracks = getTracksAdding(override, trackIndex);
TrackSelection.Factory factory = tracks.length == 1 ? FIXED_FACTORY : adaptiveTrackSelectionFactory;
override = new SelectionOverride(factory, groupIndex, tracks);
// Then we actually set our override on the selector to switch the quality/track
selector.setSelectionOverride(rendererIndex, trackGroups, override);
正如我上面提到的，这是对过程的略微过度简化，但核心部分是你正在搞乱TrackSelector，SelectionOverride和Track / TrackGroups以使其发挥作用。
您可以想象地逐字复制演示代码并且它应该可以工作，但我强烈建议您花时间了解每个部分正在做什么，并根据您的用例定制解决方案。
谢谢，我希望它有所帮助。