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.decoder;
  
  import android.annotation.TargetApi;
  import com.google.android.exoplayer2.C;
  import com.google.android.exoplayer2.util.Util;
  
  /**
   * Compatibility wrapper for {@link android.media.MediaCodec.CryptoInfo}.
   */
  public final class CryptoInfo {
  
    /**
     * @see android.media.MediaCodec.CryptoInfo#iv
     */
    public byte[] iv;
    /**
     * @see android.media.MediaCodec.CryptoInfo#key
     */
    public byte[] key;
    /**
     * @see android.media.MediaCodec.CryptoInfo#mode
     */
    @C.CryptoMode
    public int mode;
    /**
     * @see android.media.MediaCodec.CryptoInfo#numBytesOfClearData
     */
    public int[] numBytesOfClearData;
    /**
     * @see android.media.MediaCodec.CryptoInfo#numBytesOfEncryptedData
     */
    public int[] numBytesOfEncryptedData;
    /**
     * @see android.media.MediaCodec.CryptoInfo#numSubSamples
     */
    public int numSubSamples;
    /**
     * @see android.media.MediaCodec.CryptoInfo.Pattern
     */
    public int encryptedBlocks;
    /**
     * @see android.media.MediaCodec.CryptoInfo.Pattern
     */
    public int clearBlocks;
  
    private final android.media.MediaCodec.CryptoInfo frameworkCryptoInfo;
    private final PatternHolderV24 patternHolder;
  
    public CryptoInfo() {
      frameworkCryptoInfo = Util.SDK_INT >= 16 ? newFrameworkCryptoInfoV16() : null;
      patternHolder = Util.SDK_INT >= 24 ? new PatternHolderV24(frameworkCryptoInfo) : null;
    }
  
    /**
     * @see android.media.MediaCodec.CryptoInfo#set(int, int[], int[], byte[], byte[], int)
     */
    public void set(int numSubSamples, int[] numBytesOfClearData, int[] numBytesOfEncryptedData,
        byte[] key, byte[] iv, @C.CryptoMode int mode, int encryptedBlocks, int clearBlocks) {
      this.numSubSamples = numSubSamples;
      this.numBytesOfClearData = numBytesOfClearData;
      this.numBytesOfEncryptedData = numBytesOfEncryptedData;
      this.key = key;
      this.iv = iv;
      this.mode = mode;
      this.encryptedBlocks = encryptedBlocks;
      this.clearBlocks = clearBlocks;
      if (Util.SDK_INT >= 16) {
        updateFrameworkCryptoInfoV16();
      }
    }
  
    /**
     * Returns an equivalent {@link android.media.MediaCodec.CryptoInfo} instance.
     * <p>
     * Successive calls to this method on a single {@link CryptoInfo} will return the same instance.
     * Changes to the {@link CryptoInfo} will be reflected in the returned object. The return object
     * should not be modified directly.
     *
     * @return The equivalent {@link android.media.MediaCodec.CryptoInfo} instance.
     */
    @TargetApi(16)
    public android.media.MediaCodec.CryptoInfo getFrameworkCryptoInfoV16() {
      return frameworkCryptoInfo;
    }
  
    @TargetApi(16)
    private android.media.MediaCodec.CryptoInfo newFrameworkCryptoInfoV16() {
      return new android.media.MediaCodec.CryptoInfo();
    }
  
    @TargetApi(16)
    private void updateFrameworkCryptoInfoV16() {
      // Update fields directly because the framework's CryptoInfo.set performs an unnecessary object
      // allocation on Android N.
      frameworkCryptoInfo.numSubSamples = numSubSamples;
      frameworkCryptoInfo.numBytesOfClearData = numBytesOfClearData;
      frameworkCryptoInfo.numBytesOfEncryptedData = numBytesOfEncryptedData;
      frameworkCryptoInfo.key = key;
      frameworkCryptoInfo.iv = iv;
      frameworkCryptoInfo.mode = mode;
      if (Util.SDK_INT >= 24) {
        patternHolder.set(encryptedBlocks, clearBlocks);
      }
    }
  
    @TargetApi(24)
    private static final class PatternHolderV24 {
  
      private final android.media.MediaCodec.CryptoInfo frameworkCryptoInfo;
      private final android.media.MediaCodec.CryptoInfo.Pattern pattern;
  
      private PatternHolderV24(android.media.MediaCodec.CryptoInfo frameworkCryptoInfo) {
        this.frameworkCryptoInfo = frameworkCryptoInfo;
        pattern = new android.media.MediaCodec.CryptoInfo.Pattern(0, 0);
      }
  
      private void set(int encryptedBlocks, int clearBlocks) {
        pattern.set(encryptedBlocks, clearBlocks);
        frameworkCryptoInfo.setPattern(pattern);
      }
  
    }
  
  }
  