NewPipe/app/src/main/java/org/schabi/newpipe/player/ExoPlayerActivity.java

/*
 * Copyright (C) 2014 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/**
 * Created by Christian Schabesberger on 24.12.15.
 *
 * Copyright (C) Christian Schabesberger 2015 <chris.schabesberger@mailbox.org>
 * ExoPlayerActivity.java is part of NewPipe. all changes are under GPL3
 *
 * NewPipe is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * NewPipe is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with NewPipe.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.schabi.newpipe.player;

import org.schabi.newpipe.R;
import org.schabi.newpipe.player.exoplayer.DashRendererBuilder;
import org.schabi.newpipe.player.exoplayer.EventLogger;
import org.schabi.newpipe.player.exoplayer.ExtractorRendererBuilder;
import org.schabi.newpipe.player.exoplayer.HlsRendererBuilder;
import org.schabi.newpipe.player.exoplayer.NPExoPlayer;
import org.schabi.newpipe.player.exoplayer.NPExoPlayer.RendererBuilder;
import org.schabi.newpipe.player.exoplayer.SmoothStreamingRendererBuilder;
import org.schabi.newpipe.player.exoplayer.SmoothStreamingTestMediaDrmCallback;
import org.schabi.newpipe.player.exoplayer.WidevineTestMediaDrmCallback;

import com.google.android.exoplayer.AspectRatioFrameLayout;
import com.google.android.exoplayer.ExoPlaybackException;
import com.google.android.exoplayer.ExoPlayer;
import com.google.android.exoplayer.MediaCodecTrackRenderer.DecoderInitializationException;
import com.google.android.exoplayer.MediaCodecUtil.DecoderQueryException;
import com.google.android.exoplayer.MediaFormat;
import com.google.android.exoplayer.audio.AudioCapabilities;
import com.google.android.exoplayer.audio.AudioCapabilitiesReceiver;
import com.google.android.exoplayer.drm.UnsupportedDrmException;
import com.google.android.exoplayer.metadata.GeobMetadata;
import com.google.android.exoplayer.metadata.PrivMetadata;
import com.google.android.exoplayer.metadata.TxxxMetadata;
import com.google.android.exoplayer.text.CaptionStyleCompat;
import com.google.android.exoplayer.text.Cue;
import com.google.android.exoplayer.text.SubtitleLayout;
import com.google.android.exoplayer.util.DebugTextViewHelper;
import com.google.android.exoplayer.util.MimeTypes;
import com.google.android.exoplayer.util.Util;
import com.google.android.exoplayer.util.VerboseLogUtil;

import android.Manifest.permission;
import android.annotation.TargetApi;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.os.Bundle;
import android.text.TextUtils;
import android.util.Log;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnKeyListener;
import android.view.View.OnTouchListener;
import android.view.accessibility.CaptioningManager;
import android.widget.Button;
import android.widget.MediaController;
import android.widget.PopupMenu;
import android.widget.PopupMenu.OnMenuItemClickListener;
import android.widget.TextView;
import android.widget.Toast;

import java.net.CookieHandler;
import java.net.CookieManager;
import java.net.CookiePolicy;
import java.util.List;
import java.util.Locale;
import java.util.Map;

/**
 * An activity that plays media using {@link NPExoPlayer}.
 */
public class ExoPlayerActivity extends Activity {

    // For use within demo app code.
    public static final String CONTENT_ID_EXTRA = "content_id";
    public static final String CONTENT_TYPE_EXTRA = "content_type";
    public static final String PROVIDER_EXTRA = "provider";

    // For use when launching the demo app using adb.
    private static final String CONTENT_EXT_EXTRA = "type";

    private static final String TAG = "PlayerActivity";
    private static final int MENU_GROUP_TRACKS = 1;
    private static final int ID_OFFSET = 2;

    private static final CookieManager defaultCookieManager;
    static {
        defaultCookieManager = new CookieManager();
        defaultCookieManager.setCookiePolicy(CookiePolicy.ACCEPT_ORIGINAL_SERVER);
    }

    private EventLogger eventLogger;
    private MediaController mediaController;
    private View debugRootView;
    private View shutterView;
    private AspectRatioFrameLayout videoFrame;
    private SurfaceView surfaceView;
    private TextView debugTextView;
    private TextView playerStateTextView;
    private SubtitleLayout subtitleLayout;
    private Button videoButton;
    private Button audioButton;
    private Button textButton;
    private Button retryButton;

    private NPExoPlayer player;
    private DebugTextViewHelper debugViewHelper;
    private boolean playerNeedsPrepare;

    private long playerPosition;
    private boolean enableBackgroundAudio;

    private Uri contentUri;
    private int contentType;
    private String contentId;
    private String provider;

    private AudioCapabilitiesReceiver audioCapabilitiesReceiver;


    NPExoPlayer.Listener exoPlayerListener = new NPExoPlayer.Listener() {
        @Override
        public void onStateChanged(boolean playWhenReady, int playbackState) {
            if (playbackState == ExoPlayer.STATE_ENDED) {
                showControls();
            }
            String text = "playWhenReady=" + playWhenReady + ", playbackState=";
            switch(playbackState) {
                case ExoPlayer.STATE_BUFFERING:
                    text += "buffering";
                    break;
                case ExoPlayer.STATE_ENDED:
                    text += "ended";
                    break;
                case ExoPlayer.STATE_IDLE:
                    text += "idle";
                    break;
                case ExoPlayer.STATE_PREPARING:
                    text += "preparing";
                    break;
                case ExoPlayer.STATE_READY:
                    text += "ready";
                    break;
                default:
                    text += "unknown";
                    break;
            }
            playerStateTextView.setText(text);
            updateButtonVisibilities();
        }

        @Override
        public void onError(Exception e) {
            String errorString = null;
            if (e instanceof UnsupportedDrmException) {
                // Special case DRM failures.
                UnsupportedDrmException unsupportedDrmException = (UnsupportedDrmException) e;
                errorString = getString(Util.SDK_INT < 18 ? R.string.error_drm_not_supported
                        : unsupportedDrmException.reason == UnsupportedDrmException.REASON_UNSUPPORTED_SCHEME
                        ? R.string.error_drm_unsupported_scheme : R.string.error_drm_unknown);
            } else if (e instanceof ExoPlaybackException
                    && e.getCause() instanceof DecoderInitializationException) {
                // Special case for decoder initialization failures.
                DecoderInitializationException decoderInitializationException =
                        (DecoderInitializationException) e.getCause();
                if (decoderInitializationException.decoderName == null) {
                    if (decoderInitializationException.getCause() instanceof DecoderQueryException) {
                        errorString = getString(R.string.error_querying_decoders);
                    } else if (decoderInitializationException.secureDecoderRequired) {
                        errorString = getString(R.string.error_no_secure_decoder,
                                decoderInitializationException.mimeType);
                    } else {
                        errorString = getString(R.string.error_no_decoder,
                                decoderInitializationException.mimeType);
                    }
                } else {
                    errorString = getString(R.string.error_instantiating_decoder,
                            decoderInitializationException.decoderName);
                }
            }
            if (errorString != null) {
                Toast.makeText(getApplicationContext(), errorString, Toast.LENGTH_LONG).show();
            }
            playerNeedsPrepare = true;
            updateButtonVisibilities();
            showControls();
        }

        @Override
        public void onVideoSizeChanged(int width, int height, int unappliedRotationDegrees, float pixelWidthAspectRatio) {
            shutterView.setVisibility(View.GONE);
            videoFrame.setAspectRatio(
                    height == 0 ? 1 : (width * pixelWidthAspectRatio) / height);
        }
    };

    SurfaceHolder.Callback surfaceHolderCallback = new SurfaceHolder.Callback() {
        @Override
        public void surfaceCreated(SurfaceHolder holder) {
            if (player != null) {
                player.setSurface(holder.getSurface());
            }
        }

        @Override
        public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
            // Do nothing.
        }

        @Override
        public void surfaceDestroyed(SurfaceHolder holder) {
            if (player != null) {
                player.blockingClearSurface();
            }
        }
    };

    NPExoPlayer.CaptionListener captionListener = new NPExoPlayer.CaptionListener() {
        @Override
        public void onCues(List<Cue> cues) {
            subtitleLayout.setCues(cues);
        }
    };

    NPExoPlayer.Id3MetadataListener id3MetadataListener = new NPExoPlayer.Id3MetadataListener() {
        @Override
        public void onId3Metadata(Map<String, Object> metadata) {
            for (Map.Entry<String, Object> entry : metadata.entrySet()) {
                if (TxxxMetadata.TYPE.equals(entry.getKey())) {
                    TxxxMetadata txxxMetadata = (TxxxMetadata) entry.getValue();
                    Log.i(TAG, String.format("ID3 TimedMetadata %s: description=%s, value=%s",
                            TxxxMetadata.TYPE, txxxMetadata.description, txxxMetadata.value));
                } else if (PrivMetadata.TYPE.equals(entry.getKey())) {
                    PrivMetadata privMetadata = (PrivMetadata) entry.getValue();
                    Log.i(TAG, String.format("ID3 TimedMetadata %s: owner=%s",
                            PrivMetadata.TYPE, privMetadata.owner));
                } else if (GeobMetadata.TYPE.equals(entry.getKey())) {
                    GeobMetadata geobMetadata = (GeobMetadata) entry.getValue();
                    Log.i(TAG, String.format("ID3 TimedMetadata %s: mimeType=%s, filename=%s, description=%s",
                            GeobMetadata.TYPE, geobMetadata.mimeType, geobMetadata.filename,
                            geobMetadata.description));
                } else {
                    Log.i(TAG, String.format("ID3 TimedMetadata %s", entry.getKey()));
                }
            }
        }
    };

    AudioCapabilitiesReceiver.Listener audioCapabilitiesListener = new AudioCapabilitiesReceiver.Listener() {
        @Override
        public void onAudioCapabilitiesChanged(AudioCapabilities audioCapabilities) {
            if (player == null) {
                return;
            }
            boolean backgrounded = player.getBackgrounded();
            boolean playWhenReady = player.getPlayWhenReady();
            releasePlayer();
            preparePlayer(playWhenReady);
            player.setBackgrounded(backgrounded);
        }
    };

    // Activity lifecycle

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.exo_player_activity);
        View root = findViewById(R.id.root);
        root.setOnTouchListener(new OnTouchListener() {
            @Override
            public boolean onTouch(View view, MotionEvent motionEvent) {
                if (motionEvent.getAction() == MotionEvent.ACTION_DOWN) {
                    toggleControlsVisibility();
                } else if (motionEvent.getAction() == MotionEvent.ACTION_UP) {
                    view.performClick();
                }
                return true;
            }
        });
        root.setOnKeyListener(new OnKeyListener() {
            @Override
            public boolean onKey(View v, int keyCode, KeyEvent event) {
                if (keyCode == KeyEvent.KEYCODE_BACK || keyCode == KeyEvent.KEYCODE_ESCAPE
                        || keyCode == KeyEvent.KEYCODE_MENU) {
                    return false;
                }
                return mediaController.dispatchKeyEvent(event);
            }
        });

        shutterView = findViewById(R.id.shutter);
        debugRootView = findViewById(R.id.controls_root);

        videoFrame = (AspectRatioFrameLayout) findViewById(R.id.video_frame);
        surfaceView = (SurfaceView) findViewById(R.id.surface_view);
        surfaceView.getHolder().addCallback(surfaceHolderCallback);
        debugTextView = (TextView) findViewById(R.id.debug_text_view);

        playerStateTextView = (TextView) findViewById(R.id.player_state_view);
        subtitleLayout = (SubtitleLayout) findViewById(R.id.subtitles);

        mediaController = new KeyCompatibleMediaController(this);
        mediaController.setAnchorView(root);
        retryButton = (Button) findViewById(R.id.retry_button);
        videoButton = (Button) findViewById(R.id.video_controls);
        audioButton = (Button) findViewById(R.id.audio_controls);
        textButton = (Button) findViewById(R.id.text_controls);

        CookieHandler currentHandler = CookieHandler.getDefault();
        if (currentHandler != defaultCookieManager) {
            CookieHandler.setDefault(defaultCookieManager);
        }

        audioCapabilitiesReceiver = new AudioCapabilitiesReceiver(this, audioCapabilitiesListener);
        audioCapabilitiesReceiver.register();


        retryButton.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                preparePlayer(true);
            }
        });
    }

    @Override
    public void onNewIntent(Intent intent) {
        releasePlayer();
        playerPosition = 0;
        setIntent(intent);
    }

    @Override
    public void onResume() {
        super.onResume();
        Intent intent = getIntent();
        contentUri = intent.getData();
        contentType = intent.getIntExtra(CONTENT_TYPE_EXTRA,
                inferContentType(contentUri, intent.getStringExtra(CONTENT_EXT_EXTRA)));
        contentId = intent.getStringExtra(CONTENT_ID_EXTRA);
        provider = intent.getStringExtra(PROVIDER_EXTRA);
        configureSubtitleView();
        if (player == null) {
            if (!maybeRequestPermission()) {
                preparePlayer(true);
            }
        } else {
            player.setBackgrounded(false);
        }
    }

    @Override
    public void onPause() {
        super.onPause();
        if (!enableBackgroundAudio) {
            releasePlayer();
        } else {
            player.setBackgrounded(true);
        }
        shutterView.setVisibility(View.VISIBLE);
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        audioCapabilitiesReceiver.unregister();
        releasePlayer();
    }


    // Permission request listener method

    @Override
    public void onRequestPermissionsResult(int requestCode, String[] permissions,
                                           int[] grantResults) {
        if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
            preparePlayer(true);
        } else {
            Toast.makeText(getApplicationContext(), R.string.storage_permission_denied,
                    Toast.LENGTH_LONG).show();
            finish();
        }
    }

    // Permission management methods

    /**
     * Checks whether it is necessary to ask for permission to read storage. If necessary, it also
     * requests permission.
     *
     * @return true if a permission request is made. False if it is not necessary.
     */
    @TargetApi(23)
    private boolean maybeRequestPermission() {
        if (requiresPermission(contentUri)) {
            requestPermissions(new String[] {permission.READ_EXTERNAL_STORAGE}, 0);
            return true;
        } else {
            return false;
        }
    }

    @TargetApi(23)
    private boolean requiresPermission(Uri uri) {
        return Util.SDK_INT >= 23
                && Util.isLocalFileUri(uri)
                && checkSelfPermission(permission.READ_EXTERNAL_STORAGE)
                != PackageManager.PERMISSION_GRANTED;
    }

    // Internal methods

    private RendererBuilder getRendererBuilder() {
        String userAgent = Util.getUserAgent(this, "NewPipeExoPlayer");
        switch (contentType) {
            case Util.TYPE_SS:
                return new SmoothStreamingRendererBuilder(this, userAgent, contentUri.toString(),
                        new SmoothStreamingTestMediaDrmCallback());
            case Util.TYPE_DASH:
                return new DashRendererBuilder(this, userAgent, contentUri.toString(),
                        new WidevineTestMediaDrmCallback(contentId, provider));
            case Util.TYPE_HLS:
                return new HlsRendererBuilder(this, userAgent, contentUri.toString());
            case Util.TYPE_OTHER:
                return new ExtractorRendererBuilder(this, userAgent, contentUri);
            default:
                throw new IllegalStateException("Unsupported type: " + contentType);
        }
    }

    private void preparePlayer(boolean playWhenReady) {
        if (player == null) {
            player = new NPExoPlayer(getRendererBuilder());
            player.addListener(exoPlayerListener);
            player.setCaptionListener(captionListener);
            player.setMetadataListener(id3MetadataListener);
            player.seekTo(playerPosition);
            playerNeedsPrepare = true;
            mediaController.setMediaPlayer(player.getPlayerControl());
            mediaController.setEnabled(true);
            eventLogger = new EventLogger();
            eventLogger.startSession();
            player.addListener(eventLogger);
            player.setInfoListener(eventLogger);
            player.setInternalErrorListener(eventLogger);
            debugViewHelper = new DebugTextViewHelper(player, debugTextView);
            playerStateTextView.setVisibility(View.GONE);
            debugTextView.setVisibility(View.GONE);
            debugViewHelper.start();
        }
        if (playerNeedsPrepare) {
            player.prepare();
            playerNeedsPrepare = false;
            updateButtonVisibilities();
        }
        player.setSurface(surfaceView.getHolder().getSurface());
        player.setPlayWhenReady(playWhenReady);
    }

    private void releasePlayer() {
        if (player != null) {
            debugViewHelper.stop();
            debugViewHelper = null;
            playerPosition = player.getCurrentPosition();
            player.release();
            player = null;
            eventLogger.endSession();
            eventLogger = null;
        }
    }

    // User controls

    private void updateButtonVisibilities() {
        retryButton.setVisibility(playerNeedsPrepare ? View.VISIBLE : View.GONE);
        videoButton.setVisibility(haveTracks(NPExoPlayer.TYPE_VIDEO) ? View.VISIBLE : View.GONE);
        audioButton.setVisibility(haveTracks(NPExoPlayer.TYPE_AUDIO) ? View.VISIBLE : View.GONE);
        textButton.setVisibility(haveTracks(NPExoPlayer.TYPE_TEXT) ? View.VISIBLE : View.GONE);
    }

    private boolean haveTracks(int type) {
        return player != null && player.getTrackCount(type) > 0;
    }

    public void showVideoPopup(View v) {
        PopupMenu popup = new PopupMenu(this, v);
        configurePopupWithTracks(popup, null, NPExoPlayer.TYPE_VIDEO);
        popup.show();
    }

    public void showAudioPopup(View v) {
        PopupMenu popup = new PopupMenu(this, v);
        Menu menu = popup.getMenu();
        menu.add(Menu.NONE, Menu.NONE, Menu.NONE, R.string.enable_background_audio);
        final MenuItem backgroundAudioItem = menu.findItem(0);
        backgroundAudioItem.setCheckable(true);
        backgroundAudioItem.setChecked(enableBackgroundAudio);
        OnMenuItemClickListener clickListener = new OnMenuItemClickListener() {
            @Override
            public boolean onMenuItemClick(MenuItem item) {
                if (item == backgroundAudioItem) {
                    enableBackgroundAudio = !item.isChecked();
                    return true;
                }
                return false;
            }
        };
        configurePopupWithTracks(popup, clickListener, NPExoPlayer.TYPE_AUDIO);
        popup.show();
    }

    public void showTextPopup(View v) {
        PopupMenu popup = new PopupMenu(this, v);
        configurePopupWithTracks(popup, null, NPExoPlayer.TYPE_TEXT);
        popup.show();
    }

    public void showVerboseLogPopup(View v) {
        PopupMenu popup = new PopupMenu(this, v);
        Menu menu = popup.getMenu();
        menu.add(Menu.NONE, 0, Menu.NONE, R.string.logging_normal);
        menu.add(Menu.NONE, 1, Menu.NONE, R.string.logging_verbose);
        menu.setGroupCheckable(Menu.NONE, true, true);
        menu.findItem((VerboseLogUtil.areAllTagsEnabled()) ? 1 : 0).setChecked(true);
        popup.setOnMenuItemClickListener(new OnMenuItemClickListener() {
            @Override
            public boolean onMenuItemClick(MenuItem item) {
                if (item.getItemId() == 0) {
                    VerboseLogUtil.setEnableAllTags(false);
                } else {
                    VerboseLogUtil.setEnableAllTags(true);
                }
                return true;
            }
        });
        popup.show();
    }

    private void configurePopupWithTracks(PopupMenu popup,
                                          final OnMenuItemClickListener customActionClickListener,
                                          final int trackType) {
        if (player == null) {
            return;
        }
        int trackCount = player.getTrackCount(trackType);
        if (trackCount == 0) {
            return;
        }
        popup.setOnMenuItemClickListener(new OnMenuItemClickListener() {
            @Override
            public boolean onMenuItemClick(MenuItem item) {
                return (customActionClickListener != null
                        && customActionClickListener.onMenuItemClick(item))
                        || onTrackItemClick(item, trackType);
            }
        });
        Menu menu = popup.getMenu();
        // ID_OFFSET ensures we avoid clashing with Menu.NONE (which equals 0).
        menu.add(MENU_GROUP_TRACKS, NPExoPlayer.TRACK_DISABLED + ID_OFFSET, Menu.NONE, R.string.off);
        for (int i = 0; i < trackCount; i++) {
            menu.add(MENU_GROUP_TRACKS, i + ID_OFFSET, Menu.NONE,
                    buildTrackName(player.getTrackFormat(trackType, i)));
        }
        menu.setGroupCheckable(MENU_GROUP_TRACKS, true, true);
        menu.findItem(player.getSelectedTrack(trackType) + ID_OFFSET).setChecked(true);
    }

    private static String buildTrackName(MediaFormat format) {
        if (format.adaptive) {
            return "auto";
        }
        String trackName;
        if (MimeTypes.isVideo(format.mimeType)) {
            trackName = joinWithSeparator(joinWithSeparator(buildResolutionString(format),
                    buildBitrateString(format)), buildTrackIdString(format));
        } else if (MimeTypes.isAudio(format.mimeType)) {
            trackName = joinWithSeparator(joinWithSeparator(joinWithSeparator(buildLanguageString(format),
                            buildAudioPropertyString(format)), buildBitrateString(format)),
                    buildTrackIdString(format));
        } else {
            trackName = joinWithSeparator(joinWithSeparator(buildLanguageString(format),
                    buildBitrateString(format)), buildTrackIdString(format));
        }
        return trackName.length() == 0 ? "unknown" : trackName;
    }

    private static String buildResolutionString(MediaFormat format) {
        return format.width == MediaFormat.NO_VALUE || format.height == MediaFormat.NO_VALUE
                ? "" : format.width + "x" + format.height;
    }

    private static String buildAudioPropertyString(MediaFormat format) {
        return format.channelCount == MediaFormat.NO_VALUE || format.sampleRate == MediaFormat.NO_VALUE
                ? "" : format.channelCount + "ch, " + format.sampleRate + "Hz";
    }

    private static String buildLanguageString(MediaFormat format) {
        return TextUtils.isEmpty(format.language) || "und".equals(format.language) ? ""
                : format.language;
    }

    private static String buildBitrateString(MediaFormat format) {
        return format.bitrate == MediaFormat.NO_VALUE ? ""
                : String.format(Locale.US, "%.2fMbit", format.bitrate / 1000000f);
    }

    private static String joinWithSeparator(String first, String second) {
        return first.length() == 0 ? second : (second.length() == 0 ? first : first + ", " + second);
    }

    private static String buildTrackIdString(MediaFormat format) {
        return format.trackId == null ? "" : " (" + format.trackId + ")";
    }

    private boolean onTrackItemClick(MenuItem item, int type) {
        if (player == null || item.getGroupId() != MENU_GROUP_TRACKS) {
            return false;
        }
        player.setSelectedTrack(type, item.getItemId() - ID_OFFSET);
        return true;
    }

    private void toggleControlsVisibility()  {
        if (mediaController.isShowing()) {
            mediaController.hide();
            debugRootView.setVisibility(View.GONE);
            playerStateTextView.setVisibility(View.GONE);
            debugTextView.setVisibility(View.GONE);
        } else {
            showControls();
        }
    }

    private void showControls() {
        mediaController.show(0);
        debugRootView.setVisibility(View.VISIBLE);
        playerStateTextView.setVisibility(View.VISIBLE);
        debugTextView.setVisibility(View.VISIBLE);
    }

    private void configureSubtitleView() {
        CaptionStyleCompat style;
        float fontScale;
        if (Util.SDK_INT >= 19) {
            style = getUserCaptionStyleV19();
            fontScale = getUserCaptionFontScaleV19();
        } else {
            style = CaptionStyleCompat.DEFAULT;
            fontScale = 1.0f;
        }
        subtitleLayout.setStyle(style);
        subtitleLayout.setFractionalTextSize(SubtitleLayout.DEFAULT_TEXT_SIZE_FRACTION * fontScale);
    }

    @TargetApi(19)
    private float getUserCaptionFontScaleV19() {
        CaptioningManager captioningManager =
                (CaptioningManager) getSystemService(Context.CAPTIONING_SERVICE);
        return captioningManager.getFontScale();
    }

    @TargetApi(19)
    private CaptionStyleCompat getUserCaptionStyleV19() {
        CaptioningManager captioningManager =
                (CaptioningManager) getSystemService(Context.CAPTIONING_SERVICE);
        return CaptionStyleCompat.createFromCaptionStyle(captioningManager.getUserStyle());
    }

    /**
     * Makes a best guess to infer the type from a media {@link Uri} and an optional overriding file
     * extension.
     *
     * @param uri The {@link Uri} of the media.
     * @param fileExtension An overriding file extension.
     * @return The inferred type.
     */
    private static int inferContentType(Uri uri, String fileExtension) {
        String lastPathSegment = !TextUtils.isEmpty(fileExtension) ? "." + fileExtension
                : uri.getLastPathSegment();
        return Util.inferContentType(lastPathSegment);
    }

    private static final class KeyCompatibleMediaController extends MediaController {

        private MediaController.MediaPlayerControl playerControl;

        public KeyCompatibleMediaController(Context context) {
            super(context);
        }

        @Override
        public void setMediaPlayer(MediaController.MediaPlayerControl playerControl) {
            super.setMediaPlayer(playerControl);
            this.playerControl = playerControl;
        }

        @Override
        public boolean dispatchKeyEvent(KeyEvent event) {
            int keyCode = event.getKeyCode();
            if (playerControl.canSeekForward() && keyCode == KeyEvent.KEYCODE_MEDIA_FAST_FORWARD) {
                if (event.getAction() == KeyEvent.ACTION_DOWN) {
                    playerControl.seekTo(playerControl.getCurrentPosition() + 15000); // milliseconds
                    show();
                }
                return true;
            } else if (playerControl.canSeekBackward() && keyCode == KeyEvent.KEYCODE_MEDIA_REWIND) {
                if (event.getAction() == KeyEvent.ACTION_DOWN) {
                    playerControl.seekTo(playerControl.getCurrentPosition() - 5000); // milliseconds
                    show();
                }
                return true;
            }
            return super.dispatchKeyEvent(event);
        }
    }

}