content: /*
   * Copyright (C) 2016 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.
   */
  package com.google.android.exoplayer2.source.chunk;
  
  import android.util.SparseArray;
  import com.google.android.exoplayer2.C;
  import com.google.android.exoplayer2.Format;
  import com.google.android.exoplayer2.extractor.DummyTrackOutput;
  import com.google.android.exoplayer2.extractor.Extractor;
  import com.google.android.exoplayer2.extractor.ExtractorInput;
  import com.google.android.exoplayer2.extractor.ExtractorOutput;
  import com.google.android.exoplayer2.extractor.SeekMap;
  import com.google.android.exoplayer2.extractor.TrackOutput;
  import com.google.android.exoplayer2.util.Assertions;
  import com.google.android.exoplayer2.util.ParsableByteArray;
  import java.io.IOException;
  
  /**
   * An {@link Extractor} wrapper for loading chunks that contain a single primary track, and possibly
   * additional embedded tracks.
   * <p>
   * The wrapper allows switching of the {@link TrackOutput}s that receive parsed data.
   */
  public final class ChunkExtractorWrapper implements ExtractorOutput {
  
    /**
     * Provides {@link TrackOutput} instances to be written to by the wrapper.
     */
    public interface TrackOutputProvider {
  
      /**
       * Called to get the {@link TrackOutput} for a specific track.
       * <p>
       * The same {@link TrackOutput} is returned if multiple calls are made with the same {@code id}.
       *
       * @param id A track identifier.
       * @param type The type of the track. Typically one of the
       *     {@link com.google.android.exoplayer2.C} {@code TRACK_TYPE_*} constants.
       * @return The {@link TrackOutput} for the given track identifier.
       */
      TrackOutput track(int id, int type);
  
    }
  
    public final Extractor extractor;
  
    private final int primaryTrackType;
    private final Format primaryTrackManifestFormat;
    private final SparseArray<BindingTrackOutput> bindingTrackOutputs;
  
    private boolean extractorInitialized;
    private TrackOutputProvider trackOutputProvider;
    private SeekMap seekMap;
    private Format[] sampleFormats;
  
    /**
     * @param extractor The extractor to wrap.
     * @param primaryTrackType The type of the primary track. Typically one of the
     *     {@link com.google.android.exoplayer2.C} {@code TRACK_TYPE_*} constants.
     * @param primaryTrackManifestFormat A manifest defined {@link Format} whose data should be merged
     *     into any sample {@link Format} output from the {@link Extractor} for the primary track.
     */
    public ChunkExtractorWrapper(Extractor extractor, int primaryTrackType,
        Format primaryTrackManifestFormat) {
      this.extractor = extractor;
      this.primaryTrackType = primaryTrackType;
      this.primaryTrackManifestFormat = primaryTrackManifestFormat;
      bindingTrackOutputs = new SparseArray<>();
    }
  
    /**
     * Returns the {@link SeekMap} most recently output by the extractor, or null.
     */
    public SeekMap getSeekMap() {
      return seekMap;
    }
  
    /**
     * Returns the sample {@link Format}s most recently output by the extractor, or null.
     */
    public Format[] getSampleFormats() {
      return sampleFormats;
    }
  
    /**
     * Initializes the wrapper to output to {@link TrackOutput}s provided by the specified
     * {@link TrackOutputProvider}, and configures the extractor to receive data from a new chunk.
     *
     * @param trackOutputProvider The provider of {@link TrackOutput}s that will receive sample data.
     */
    public void init(TrackOutputProvider trackOutputProvider) {
      this.trackOutputProvider = trackOutputProvider;
      if (!extractorInitialized) {
        extractor.init(this);
        extractorInitialized = true;
      } else {
        extractor.seek(0, 0);
        for (int i = 0; i < bindingTrackOutputs.size(); i++) {
          bindingTrackOutputs.valueAt(i).bind(trackOutputProvider);
        }
      }
    }
  
    // ExtractorOutput implementation.
  
    @Override
    public TrackOutput track(int id, int type) {
      BindingTrackOutput bindingTrackOutput = bindingTrackOutputs.get(id);
      if (bindingTrackOutput == null) {
        // Assert that if we're seeing a new track we have not seen endTracks.
        Assertions.checkState(sampleFormats == null);
        // TODO: Manifest formats for embedded tracks should also be passed here.
        bindingTrackOutput = new BindingTrackOutput(id, type,
            type == primaryTrackType ? primaryTrackManifestFormat : null);
        bindingTrackOutput.bind(trackOutputProvider);
        bindingTrackOutputs.put(id, bindingTrackOutput);
      }
      return bindingTrackOutput;
    }
  
    @Override
    public void endTracks() {
      Format[] sampleFormats = new Format[bindingTrackOutputs.size()];
      for (int i = 0; i < bindingTrackOutputs.size(); i++) {
        sampleFormats[i] = bindingTrackOutputs.valueAt(i).sampleFormat;
      }
      this.sampleFormats = sampleFormats;
    }
  
    @Override
    public void seekMap(SeekMap seekMap) {
      this.seekMap = seekMap;
    }
  
    // Internal logic.
  
    private static final class BindingTrackOutput implements TrackOutput {
  
      private final int id;
      private final int type;
      private final Format manifestFormat;
  
      public Format sampleFormat;
      private TrackOutput trackOutput;
  
      public BindingTrackOutput(int id, int type, Format manifestFormat) {
        this.id = id;
        this.type = type;
        this.manifestFormat = manifestFormat;
      }
  
      public void bind(TrackOutputProvider trackOutputProvider) {
        if (trackOutputProvider == null) {
          trackOutput = new DummyTrackOutput();
          return;
        }
        trackOutput = trackOutputProvider.track(id, type);
        if (sampleFormat != null) {
          trackOutput.format(sampleFormat);
        }
      }
  
      @Override
      public void format(Format format) {
        sampleFormat = manifestFormat != null ? format.copyWithManifestFormatInfo(manifestFormat)
            : format;
        trackOutput.format(sampleFormat);
      }
  
      @Override
      public int sampleData(ExtractorInput input, int length, boolean allowEndOfInput)
          throws IOException, InterruptedException {
        return trackOutput.sampleData(input, length, allowEndOfInput);
      }
  
      @Override
      public void sampleData(ParsableByteArray data, int length) {
        trackOutput.sampleData(data, length);
      }
  
      @Override
      public void sampleMetadata(long timeUs, @C.BufferFlags int flags, int size, int offset,
          CryptoData cryptoData) {
        trackOutput.sampleMetadata(timeUs, flags, size, offset, cryptoData);
      }
  
    }
  
  }
  