import com.google.android.exoplayer2.RendererCapabilities; //导入依赖的package包/类
private void setSelector(MappingTrackSelector selector) {
        this.selector = selector;
        setTrackInfo(selector.getCurrentMappedTrackInfo());
        setTrackGroups(trackInfo.getTrackGroups(rendererIndex));
        setOverride(selector.getSelectionOverride(rendererIndex, trackGroups));

        trackGroupsAdaptive = new boolean[trackGroups.length];
        for (int i = 0; i < trackGroups.length; i++) {
            trackGroupsAdaptive[i] = adaptiveTrackSelectionFactory != null
                    && trackInfo.getAdaptiveSupport(rendererIndex, i, false)
                    != RendererCapabilities.ADAPTIVE_NOT_SUPPORTED
                    && trackGroups.get(i).length > 1;
        }
//        isDisabled = selector.getRendererDisabled(rendererIndex);
//        override = selector.getSelectionOverride(rendererIndex, trackGroups);
    }
 

import com.google.android.exoplayer2.RendererCapabilities; //导入依赖的package包/类
/**
 * Shows the selection dialog for a given renderer.
 *
 * @param activity The parent activity.
 * @param title The dialog's title.
 * @param trackInfo The current track information.
 * @param rendererIndex The index of the renderer.
 */
public void showSelectionDialog(Activity activity, CharSequence title, MappedTrackInfo trackInfo,
    int rendererIndex) {
  this.trackInfo = trackInfo;
  this.rendererIndex = rendererIndex;

  trackGroups = trackInfo.getTrackGroups(rendererIndex);
  trackGroupsAdaptive = new boolean[trackGroups.length];
  for (int i = 0; i < trackGroups.length; i++) {
    trackGroupsAdaptive[i] = adaptiveVideoTrackSelectionFactory != null
        && trackInfo.getAdaptiveSupport(rendererIndex, i, false)
            != RendererCapabilities.ADAPTIVE_NOT_SUPPORTED
        && trackGroups.get(i).length > 1;
  }
  isDisabled = selector.getRendererDisabled(rendererIndex);
  override = selector.getSelectionOverride(rendererIndex, trackGroups);

  AlertDialog.Builder builder = new AlertDialog.Builder(activity);
  builder.setTitle(title)
      .setView(buildView(builder.getContext()))
      .setPositiveButton(android.R.string.ok, this)
      .setNegativeButton(android.R.string.cancel, null)
      .create()
      .show();
}
 

import com.google.android.exoplayer2.RendererCapabilities; //导入依赖的package包/类
@Override
protected TrackSelection[] selectTracks(RendererCapabilities[] rendererCapabilities,
    TrackGroupArray[] rendererTrackGroupArrays, int[][][] rendererFormatSupports)
    throws ExoPlaybackException {
  Assertions.checkState(rendererCapabilities[VIDEO_RENDERER_INDEX].getTrackType()
      == C.TRACK_TYPE_VIDEO);
  Assertions.checkState(rendererCapabilities[AUDIO_RENDERER_INDEX].getTrackType()
      == C.TRACK_TYPE_AUDIO);
  Assertions.checkState(rendererTrackGroupArrays[VIDEO_RENDERER_INDEX].length == 1);
  Assertions.checkState(rendererTrackGroupArrays[AUDIO_RENDERER_INDEX].length == 1);
  TrackSelection[] selections = new TrackSelection[rendererCapabilities.length];
  selections[VIDEO_RENDERER_INDEX] = new RandomTrackSelection(
      rendererTrackGroupArrays[VIDEO_RENDERER_INDEX].get(0),
      getVideoTrackIndices(rendererTrackGroupArrays[VIDEO_RENDERER_INDEX].get(0),
          rendererFormatSupports[VIDEO_RENDERER_INDEX][0], videoFormatIds,
          canIncludeAdditionalVideoFormats),
      0 /* seed */);
  selections[AUDIO_RENDERER_INDEX] = new FixedTrackSelection(
      rendererTrackGroupArrays[AUDIO_RENDERER_INDEX].get(0),
      getTrackIndex(rendererTrackGroupArrays[AUDIO_RENDERER_INDEX].get(0), audioFormatId));
  includedAdditionalVideoFormats =
      selections[VIDEO_RENDERER_INDEX].length() > videoFormatIds.length;
  return selections;
}
 

import com.google.android.exoplayer2.RendererCapabilities; //导入依赖的package包/类
protected TrackSelection selectVideoTrack(RendererCapabilities rendererCapabilities,
    TrackGroupArray groups, int[][] formatSupport, int maxVideoWidth, int maxVideoHeight,
    int maxVideoBitrate, boolean allowNonSeamlessAdaptiveness, boolean allowMixedMimeAdaptiveness,
    int viewportWidth, int viewportHeight, boolean orientationMayChange,
    TrackSelection.Factory adaptiveTrackSelectionFactory, boolean exceedConstraintsIfNecessary,
    boolean exceedRendererCapabilitiesIfNecessary) throws ExoPlaybackException {
  TrackSelection selection = null;
  if (adaptiveTrackSelectionFactory != null) {
    selection = selectAdaptiveVideoTrack(rendererCapabilities, groups, formatSupport,
        maxVideoWidth, maxVideoHeight, maxVideoBitrate, allowNonSeamlessAdaptiveness,
        allowMixedMimeAdaptiveness, viewportWidth, viewportHeight,
        orientationMayChange, adaptiveTrackSelectionFactory);
  }
  if (selection == null) {
    selection = selectFixedVideoTrack(groups, formatSupport, maxVideoWidth, maxVideoHeight,
        maxVideoBitrate, viewportWidth, viewportHeight, orientationMayChange,
        exceedConstraintsIfNecessary, exceedRendererCapabilitiesIfNecessary);
  }
  return selection;
}
 

import com.google.android.exoplayer2.RendererCapabilities; //导入依赖的package包/类
private static TrackSelection selectAdaptiveVideoTrack(RendererCapabilities rendererCapabilities,
    TrackGroupArray groups, int[][] formatSupport, int maxVideoWidth, int maxVideoHeight,
    int maxVideoBitrate, boolean allowNonSeamlessAdaptiveness, boolean allowMixedMimeAdaptiveness,
    int viewportWidth, int viewportHeight, boolean orientationMayChange,
    TrackSelection.Factory adaptiveTrackSelectionFactory) throws ExoPlaybackException {
  int requiredAdaptiveSupport = allowNonSeamlessAdaptiveness
      ? (RendererCapabilities.ADAPTIVE_NOT_SEAMLESS | RendererCapabilities.ADAPTIVE_SEAMLESS)
      : RendererCapabilities.ADAPTIVE_SEAMLESS;
  boolean allowMixedMimeTypes = allowMixedMimeAdaptiveness
      && (rendererCapabilities.supportsMixedMimeTypeAdaptation() & requiredAdaptiveSupport) != 0;
  for (int i = 0; i < groups.length; i++) {
    TrackGroup group = groups.get(i);
    int[] adaptiveTracks = getAdaptiveVideoTracksForGroup(group, formatSupport[i],
        allowMixedMimeTypes, requiredAdaptiveSupport, maxVideoWidth, maxVideoHeight,
        maxVideoBitrate, viewportWidth, viewportHeight, orientationMayChange);
    if (adaptiveTracks.length > 0) {
      return adaptiveTrackSelectionFactory.createTrackSelection(group, adaptiveTracks);
    }
  }
  return null;
}
 

import com.google.android.exoplayer2.RendererCapabilities; //导入依赖的package包/类
/**
 * Finds the renderer to which the provided {@link TrackGroup} should be associated.
 * <p>
 * A {@link TrackGroup} is associated to a renderer that reports
 * {@link RendererCapabilities#FORMAT_HANDLED} support for one or more of the tracks in the group,
 * or {@link RendererCapabilities#FORMAT_EXCEEDS_CAPABILITIES} if no such renderer exists, or
 * {@link RendererCapabilities#FORMAT_UNSUPPORTED_SUBTYPE} if again no such renderer exists. In
 * the case that two or more renderers report the same level of support, the renderer with the
 * lowest index is associated.
 * <p>
 * If all renderers report {@link RendererCapabilities#FORMAT_UNSUPPORTED_TYPE} for all of the
 * tracks in the group, then {@code renderers.length} is returned to indicate that no association
 * was made.
 *
 * @param rendererCapabilities The {@link RendererCapabilities} of the renderers.
 * @param group The {@link TrackGroup} whose associated renderer is to be found.
 * @return The index of the associated renderer, or {@code renderers.length} if no
 *     association was made.
 * @throws ExoPlaybackException If an error occurs finding a renderer.
 */
private static int findRenderer(RendererCapabilities[] rendererCapabilities, TrackGroup group)
    throws ExoPlaybackException {
  int bestRendererIndex = rendererCapabilities.length;
  int bestFormatSupportLevel = RendererCapabilities.FORMAT_UNSUPPORTED_TYPE;
  for (int rendererIndex = 0; rendererIndex < rendererCapabilities.length; rendererIndex++) {
    RendererCapabilities rendererCapability = rendererCapabilities[rendererIndex];
    for (int trackIndex = 0; trackIndex < group.length; trackIndex++) {
      int formatSupportLevel = rendererCapability.supportsFormat(group.getFormat(trackIndex))
          & RendererCapabilities.FORMAT_SUPPORT_MASK;
      if (formatSupportLevel > bestFormatSupportLevel) {
        bestRendererIndex = rendererIndex;
        bestFormatSupportLevel = formatSupportLevel;
        if (bestFormatSupportLevel == RendererCapabilities.FORMAT_HANDLED) {
          // We can't do better.
          return bestRendererIndex;
        }
      }
    }
  }
  return bestRendererIndex;
}
 

import com.google.android.exoplayer2.RendererCapabilities; //导入依赖的package包/类
/**
 * Returns whether a renderer supports tunneling for a {@link TrackSelection}.
 *
 * @param formatSupport The result of {@link RendererCapabilities#supportsFormat} for each
 *     track, indexed by group index and track index (in that order).
 * @param trackGroups The {@link TrackGroupArray}s for the renderer.
 * @param selection The track selection.
 * @return Whether the renderer supports tunneling for the {@link TrackSelection}.
 */
private static boolean rendererSupportsTunneling(int[][] formatSupport,
    TrackGroupArray trackGroups, TrackSelection selection) {
  if (selection == null) {
    return false;
  }
  int trackGroupIndex = trackGroups.indexOf(selection.getTrackGroup());
  for (int i = 0; i < selection.length(); i++) {
    int trackFormatSupport = formatSupport[trackGroupIndex][selection.getIndexInTrackGroup(i)];
    if ((trackFormatSupport & RendererCapabilities.TUNNELING_SUPPORT_MASK)
        != RendererCapabilities.TUNNELING_SUPPORTED) {
      return false;
    }
  }
  return true;
}
 

import com.google.android.exoplayer2.RendererCapabilities; //导入依赖的package包/类
/**
 * Returns the extent to which a renderer can support playback of the tracks associated to it.
 *
 * @param rendererIndex The renderer index.
 * @return One of {@link #RENDERER_SUPPORT_PLAYABLE_TRACKS},
 *     {@link #RENDERER_SUPPORT_EXCEEDS_CAPABILITIES_TRACKS},
 *     {@link #RENDERER_SUPPORT_UNSUPPORTED_TRACKS} and {@link #RENDERER_SUPPORT_NO_TRACKS}.
 */
public int getRendererSupport(int rendererIndex) {
  int bestRendererSupport = RENDERER_SUPPORT_NO_TRACKS;
  int[][] rendererFormatSupport = formatSupport[rendererIndex];
  for (int i = 0; i < rendererFormatSupport.length; i++) {
    for (int j = 0; j < rendererFormatSupport[i].length; j++) {
      int trackRendererSupport;
      switch (rendererFormatSupport[i][j] & RendererCapabilities.FORMAT_SUPPORT_MASK) {
        case RendererCapabilities.FORMAT_HANDLED:
          return RENDERER_SUPPORT_PLAYABLE_TRACKS;
        case RendererCapabilities.FORMAT_EXCEEDS_CAPABILITIES:
          trackRendererSupport = RENDERER_SUPPORT_EXCEEDS_CAPABILITIES_TRACKS;
          break;
        default:
          trackRendererSupport = RENDERER_SUPPORT_UNSUPPORTED_TRACKS;
          break;
      }
      bestRendererSupport = Math.max(bestRendererSupport, trackRendererSupport);
    }
  }
  return bestRendererSupport;
}
 

import com.google.android.exoplayer2.RendererCapabilities; //导入依赖的package包/类
/**
 * Returns the extent to which the renderer supports adaptation between specified tracks within
 * a {@link TrackGroup}.
 *
 * @param rendererIndex The renderer index.
 * @param groupIndex The index of the group.
 * @return One of {@link RendererCapabilities#ADAPTIVE_SEAMLESS},
 *     {@link RendererCapabilities#ADAPTIVE_NOT_SEAMLESS} and
 *     {@link RendererCapabilities#ADAPTIVE_NOT_SUPPORTED}.
 */
public int getAdaptiveSupport(int rendererIndex, int groupIndex, int[] trackIndices) {
  int handledTrackCount = 0;
  int adaptiveSupport = RendererCapabilities.ADAPTIVE_SEAMLESS;
  boolean multipleMimeTypes = false;
  String firstSampleMimeType = null;
  for (int i = 0; i < trackIndices.length; i++) {
    int trackIndex = trackIndices[i];
    String sampleMimeType = trackGroups[rendererIndex].get(groupIndex).getFormat(trackIndex)
        .sampleMimeType;
    if (handledTrackCount++ == 0) {
      firstSampleMimeType = sampleMimeType;
    } else {
      multipleMimeTypes |= !Util.areEqual(firstSampleMimeType, sampleMimeType);
    }
    adaptiveSupport = Math.min(adaptiveSupport, formatSupport[rendererIndex][groupIndex][i]
        & RendererCapabilities.ADAPTIVE_SUPPORT_MASK);
  }
  return multipleMimeTypes
      ? Math.min(adaptiveSupport, mixedMimeTypeAdaptiveSupport[rendererIndex])
      : adaptiveSupport;
}
 

import com.google.android.exoplayer2.RendererCapabilities; //导入依赖的package包/类
private static String getFormatSupportString(int formatSupport) {
  switch (formatSupport) {
    case RendererCapabilities.FORMAT_HANDLED:
      return "YES";
    case RendererCapabilities.FORMAT_EXCEEDS_CAPABILITIES:
      return "NO_EXCEEDS_CAPABILITIES";
    case RendererCapabilities.FORMAT_UNSUPPORTED_DRM:
      return "NO_UNSUPPORTED_DRM";
    case RendererCapabilities.FORMAT_UNSUPPORTED_SUBTYPE:
      return "NO_UNSUPPORTED_TYPE";
    case RendererCapabilities.FORMAT_UNSUPPORTED_TYPE:
      return "NO";
    default:
      return "?";
  }
}
 

import com.google.android.exoplayer2.RendererCapabilities; //导入依赖的package包/类
protected TrackSelection selectVideoTrack(RendererCapabilities rendererCapabilities,
    TrackGroupArray groups, int[][] formatSupport, int maxVideoWidth, int maxVideoHeight,
    int maxVideoBitrate, boolean allowNonSeamlessAdaptiveness, boolean allowMixedMimeAdaptiveness,
    int viewportWidth, int viewportHeight, boolean orientationMayChange,
    TrackSelection.Factory adaptiveVideoTrackSelectionFactory,
    boolean exceedConstraintsIfNecessary, boolean exceedRendererCapabilitiesIfNecessary)
    throws ExoPlaybackException {
  TrackSelection selection = null;
  if (adaptiveVideoTrackSelectionFactory != null) {
    selection = selectAdaptiveVideoTrack(rendererCapabilities, groups, formatSupport,
        maxVideoWidth, maxVideoHeight, maxVideoBitrate, allowNonSeamlessAdaptiveness,
        allowMixedMimeAdaptiveness, viewportWidth, viewportHeight,
        orientationMayChange, adaptiveVideoTrackSelectionFactory);
  }
  if (selection == null) {
    selection = selectFixedVideoTrack(groups, formatSupport, maxVideoWidth, maxVideoHeight,
        maxVideoBitrate, viewportWidth, viewportHeight, orientationMayChange,
        exceedConstraintsIfNecessary, exceedRendererCapabilitiesIfNecessary);
  }
  return selection;
}
 

import com.google.android.exoplayer2.RendererCapabilities; //导入依赖的package包/类
private static TrackSelection selectAdaptiveVideoTrack(RendererCapabilities rendererCapabilities,
    TrackGroupArray groups, int[][] formatSupport, int maxVideoWidth, int maxVideoHeight,
    int maxVideoBitrate, boolean allowNonSeamlessAdaptiveness, boolean allowMixedMimeAdaptiveness,
    int viewportWidth, int viewportHeight, boolean orientationMayChange,
    TrackSelection.Factory adaptiveVideoTrackSelectionFactory) throws ExoPlaybackException {
  int requiredAdaptiveSupport = allowNonSeamlessAdaptiveness
      ? (RendererCapabilities.ADAPTIVE_NOT_SEAMLESS | RendererCapabilities.ADAPTIVE_SEAMLESS)
      : RendererCapabilities.ADAPTIVE_SEAMLESS;
  boolean allowMixedMimeTypes = allowMixedMimeAdaptiveness
      && (rendererCapabilities.supportsMixedMimeTypeAdaptation() & requiredAdaptiveSupport) != 0;
  for (int i = 0; i < groups.length; i++) {
    TrackGroup group = groups.get(i);
    int[] adaptiveTracks = getAdaptiveTracksForGroup(group, formatSupport[i],
        allowMixedMimeTypes, requiredAdaptiveSupport, maxVideoWidth, maxVideoHeight,
        maxVideoBitrate, viewportWidth, viewportHeight, orientationMayChange);
    if (adaptiveTracks.length > 0) {
      return adaptiveVideoTrackSelectionFactory.createTrackSelection(group, adaptiveTracks);
    }
  }
  return null;
}
 

import com.google.android.exoplayer2.RendererCapabilities; //导入依赖的package包/类
/**
 * Shows the selection dialog for a given renderer.
 *
 * @param activity      The parent activity.
 * @param title         The dialog's title.
 * @param trackInfo     The current track information.
 * @param rendererIndex The index of the renderer.
 */
public void showSelectionDialog(Activity activity, CharSequence title, MappedTrackInfo trackInfo,
                                int rendererIndex) {
    this.trackInfo = trackInfo;
    this.rendererIndex = rendererIndex;

    trackGroups = trackInfo.getTrackGroups(rendererIndex);
    trackGroupsAdaptive = new boolean[trackGroups.length];
    for (int i = 0; i < trackGroups.length; i++) {
        trackGroupsAdaptive[i] = adaptiveVideoTrackSelectionFactory != null
                && trackInfo.getAdaptiveSupport(rendererIndex, i, false)
                != RendererCapabilities.ADAPTIVE_NOT_SUPPORTED
                && trackGroups.get(i).length > 1;
    }
    isDisabled = selector.getRendererDisabled(rendererIndex);
    override = selector.getSelectionOverride(rendererIndex, trackGroups);

    AlertDialog.Builder builder = new AlertDialog.Builder(activity);
    builder.setTitle(title)
            .setView(buildView(LayoutInflater.from(builder.getContext())))
            .setPositiveButton(android.R.string.ok, this)
            .setNegativeButton(android.R.string.cancel, null)
            .create()
            .show();
}
 

import com.google.android.exoplayer2.RendererCapabilities; //导入依赖的package包/类
protected TrackSelection selectVideoTrack(RendererCapabilities rendererCapabilities,
    TrackGroupArray groups, int[][] formatSupport, int maxVideoWidth, int maxVideoHeight,
    boolean allowNonSeamlessAdaptiveness, boolean allowMixedMimeAdaptiveness, int viewportWidth,
    int viewportHeight, boolean orientationMayChange,
    TrackSelection.Factory adaptiveVideoTrackSelectionFactory,
    boolean exceedConstraintsIfNecessary) throws ExoPlaybackException {
  TrackSelection selection = null;
  if (adaptiveVideoTrackSelectionFactory != null) {
    selection = selectAdaptiveVideoTrack(rendererCapabilities, groups, formatSupport,
        maxVideoWidth, maxVideoHeight, allowNonSeamlessAdaptiveness,
        allowMixedMimeAdaptiveness, viewportWidth, viewportHeight,
        orientationMayChange, adaptiveVideoTrackSelectionFactory);
  }
  if (selection == null) {
    selection = selectFixedVideoTrack(groups, formatSupport, maxVideoWidth, maxVideoHeight,
        viewportWidth, viewportHeight, orientationMayChange, exceedConstraintsIfNecessary);
  }
  return selection;
}
 

import com.google.android.exoplayer2.RendererCapabilities; //导入依赖的package包/类
private static TrackSelection selectAdaptiveVideoTrack(RendererCapabilities rendererCapabilities,
    TrackGroupArray groups, int[][] formatSupport, int maxVideoWidth, int maxVideoHeight,
    boolean allowNonSeamlessAdaptiveness, boolean allowMixedMimeAdaptiveness, int viewportWidth,
    int viewportHeight, boolean orientationMayChange,
    TrackSelection.Factory adaptiveVideoTrackSelectionFactory) throws ExoPlaybackException {
  int requiredAdaptiveSupport = allowNonSeamlessAdaptiveness
      ? (RendererCapabilities.ADAPTIVE_NOT_SEAMLESS | RendererCapabilities.ADAPTIVE_SEAMLESS)
      : RendererCapabilities.ADAPTIVE_SEAMLESS;
  boolean allowMixedMimeTypes = allowMixedMimeAdaptiveness
      && (rendererCapabilities.supportsMixedMimeTypeAdaptation() & requiredAdaptiveSupport) != 0;
  for (int i = 0; i < groups.length; i++) {
    TrackGroup group = groups.get(i);
    int[] adaptiveTracks = getAdaptiveTracksForGroup(group, formatSupport[i],
        allowMixedMimeTypes, requiredAdaptiveSupport, maxVideoWidth, maxVideoHeight,
        viewportWidth, viewportHeight, orientationMayChange);
    if (adaptiveTracks.length > 0) {
      return adaptiveVideoTrackSelectionFactory.createTrackSelection(group, adaptiveTracks);
    }
  }
  return null;
}
 

import com.google.android.exoplayer2.RendererCapabilities; //导入依赖的package包/类
/**
 * Finds the renderer to which the provided {@link TrackGroup} should be associated.
 * <p>
 * A {@link TrackGroup} is associated to a renderer that reports
 * {@link RendererCapabilities#FORMAT_HANDLED} support for one or more of the tracks in the group,
 * or {@link RendererCapabilities#FORMAT_EXCEEDS_CAPABILITIES} if no such renderer exists, or
 * {@link RendererCapabilities#FORMAT_UNSUPPORTED_SUBTYPE} if again no such renderer exists. In
 * the case that two or more renderers report the same level of support, the renderer with the
 * lowest index is associated.
 * <p>
 * If all renderers report {@link RendererCapabilities#FORMAT_UNSUPPORTED_TYPE} for all of the
 * tracks in the group, then {@code renderers.length} is returned to indicate that no association
 * was made.
 *
 * @param rendererCapabilities The {@link RendererCapabilities} of the renderers.
 * @param group The {@link TrackGroup} whose associated renderer is to be found.
 * @return The index of the associated renderer, or {@code renderers.length} if no
 *     association was made.
 * @throws ExoPlaybackException If an error occurs finding a renderer.
 */
private static int findRenderer(RendererCapabilities[] rendererCapabilities, TrackGroup group)
    throws ExoPlaybackException {
  int bestRendererIndex = rendererCapabilities.length;
  int bestSupportLevel = RendererCapabilities.FORMAT_UNSUPPORTED_TYPE;
  for (int rendererIndex = 0; rendererIndex < rendererCapabilities.length; rendererIndex++) {
    RendererCapabilities rendererCapability = rendererCapabilities[rendererIndex];
    for (int trackIndex = 0; trackIndex < group.length; trackIndex++) {
      int trackSupportLevel = rendererCapability.supportsFormat(group.getFormat(trackIndex));
      if (trackSupportLevel > bestSupportLevel) {
        bestRendererIndex = rendererIndex;
        bestSupportLevel = trackSupportLevel;
        if (bestSupportLevel == RendererCapabilities.FORMAT_HANDLED) {
          // We can't do better.
          return bestRendererIndex;
        }
      }
    }
  }
  return bestRendererIndex;
}
 

import com.google.android.exoplayer2.RendererCapabilities; //导入依赖的package包/类
/**
 * Shows the selection dialog for a given renderer.
 *
 * @param activity The parent activity.
 * @param title The dialog's title.
 * @param trackInfo The current track information.
 * @param rendererIndex The index of the renderer.
 */
public void showSelectionDialog(Activity activity, CharSequence title, MappedTrackInfo trackInfo,
                                int rendererIndex) {
  this.trackInfo = trackInfo;
  this.rendererIndex = rendererIndex;

  trackGroups = trackInfo.getTrackGroups(rendererIndex);
  trackGroupsAdaptive = new boolean[trackGroups.length];
  for (int i = 0; i < trackGroups.length; i++) {
    trackGroupsAdaptive[i] = adaptiveVideoTrackSelectionFactory != null
        && trackInfo.getAdaptiveSupport(rendererIndex, i, false)
            != RendererCapabilities.ADAPTIVE_NOT_SUPPORTED
        && trackGroups.get(i).length > 1;
  }
  isDisabled = selector.getRendererDisabled(rendererIndex);
  override = selector.getSelectionOverride(rendererIndex, trackGroups);

  AlertDialog.Builder builder = new AlertDialog.Builder(activity);
  builder.setTitle(title)
      .setView(buildView(builder.getContext()))
      .setPositiveButton(android.R.string.ok, this)
      .setNegativeButton(android.R.string.cancel, null)
      .create()
      .show();
}
 

import com.google.android.exoplayer2.RendererCapabilities; //导入依赖的package包/类
/**
 * Shows the selection dialog for a given renderer.
 *
 * @param activity The parent activity.
 * @param title The dialog's title.
 * @param trackInfo The current track information.
 * @param rendererIndex The index of the renderer.
 */
public void showSelectionDialog(Activity activity, CharSequence title, MappedTrackInfo trackInfo,
    int rendererIndex) {
  this.trackInfo = trackInfo;
  this.rendererIndex = rendererIndex;

  trackGroups = trackInfo.getTrackGroups(rendererIndex);
  trackGroupsAdaptive = new boolean[trackGroups.length];
  for (int i = 0; i < trackGroups.length; i++) {
    trackGroupsAdaptive[i] = adaptiveTrackSelectionFactory != null
        && trackInfo.getAdaptiveSupport(rendererIndex, i, false)
            != RendererCapabilities.ADAPTIVE_NOT_SUPPORTED
        && trackGroups.get(i).length > 1;
  }
  isDisabled = selector.getRendererDisabled(rendererIndex);
  override = selector.getSelectionOverride(rendererIndex, trackGroups);

  AlertDialog.Builder builder = new AlertDialog.Builder(activity);
  builder.setTitle(title)
      .setView(buildView(builder.getContext()))
      .setPositiveButton(android.R.string.ok, this)
      .setNegativeButton(android.R.string.cancel, null)
      .create()
      .show();
}
 

import com.google.android.exoplayer2.RendererCapabilities; //导入依赖的package包/类
private static TrackSelection selectAdaptiveVideoTrack(RendererCapabilities rendererCapabilities,
    TrackGroupArray groups, int[][] formatSupport, Parameters params,
    TrackSelection.Factory adaptiveTrackSelectionFactory) throws ExoPlaybackException {
  int requiredAdaptiveSupport = params.allowNonSeamlessAdaptiveness
      ? (RendererCapabilities.ADAPTIVE_NOT_SEAMLESS | RendererCapabilities.ADAPTIVE_SEAMLESS)
      : RendererCapabilities.ADAPTIVE_SEAMLESS;
  boolean allowMixedMimeTypes = params.allowMixedMimeAdaptiveness
      && (rendererCapabilities.supportsMixedMimeTypeAdaptation() & requiredAdaptiveSupport) != 0;
  for (int i = 0; i < groups.length; i++) {
    TrackGroup group = groups.get(i);
    int[] adaptiveTracks = getAdaptiveVideoTracksForGroup(group, formatSupport[i],
        allowMixedMimeTypes, requiredAdaptiveSupport, params.maxVideoWidth, params.maxVideoHeight,
        params.maxVideoBitrate, params.viewportWidth, params.viewportHeight,
        params.viewportOrientationMayChange);
    if (adaptiveTracks.length > 0) {
      return adaptiveTrackSelectionFactory.createTrackSelection(group, adaptiveTracks);
    }
  }
  return null;
}
 

import com.google.android.exoplayer2.RendererCapabilities; //导入依赖的package包/类
/**
 * Returns the extent to which a renderer can play the tracks in the track groups mapped to it.
 *
 * @param rendererIndex The renderer index.
 * @return One of {@link #RENDERER_SUPPORT_PLAYABLE_TRACKS},
 *     {@link #RENDERER_SUPPORT_EXCEEDS_CAPABILITIES_TRACKS},
 *     {@link #RENDERER_SUPPORT_UNSUPPORTED_TRACKS} and {@link #RENDERER_SUPPORT_NO_TRACKS}.
 */
public int getRendererSupport(int rendererIndex) {
  int bestRendererSupport = RENDERER_SUPPORT_NO_TRACKS;
  int[][] rendererFormatSupport = formatSupport[rendererIndex];
  for (int i = 0; i < rendererFormatSupport.length; i++) {
    for (int j = 0; j < rendererFormatSupport[i].length; j++) {
      int trackRendererSupport;
      switch (rendererFormatSupport[i][j] & RendererCapabilities.FORMAT_SUPPORT_MASK) {
        case RendererCapabilities.FORMAT_HANDLED:
          return RENDERER_SUPPORT_PLAYABLE_TRACKS;
        case RendererCapabilities.FORMAT_EXCEEDS_CAPABILITIES:
          trackRendererSupport = RENDERER_SUPPORT_EXCEEDS_CAPABILITIES_TRACKS;
          break;
        default:
          trackRendererSupport = RENDERER_SUPPORT_UNSUPPORTED_TRACKS;
          break;
      }
      bestRendererSupport = Math.max(bestRendererSupport, trackRendererSupport);
    }
  }
  return bestRendererSupport;
}