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/*
* 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 org.mozilla.thirdparty.com.google.android.exoplayer2.decoder;
import android.annotation.TargetApi;
import org.mozilla.thirdparty.com.google.android.exoplayer2.C;
import org.mozilla.thirdparty.com.google.android.exoplayer2.util.Util;
/**
* Compatibility wrapper for {@link android.media.MediaCodec.CryptoInfo}.
*/
public final class CryptoInfo {
/**
* The 16 byte initialization vector. If the initialization vector of the content is shorter than
* 16 bytes, 0 byte padding is appended to extend the vector to the required 16 byte length.
*
* @see android.media.MediaCodec.CryptoInfo#iv
*/
public byte[] iv;
/**
* The 16 byte key id.
*
* @see android.media.MediaCodec.CryptoInfo#key
*/
public byte[] key;
/**
* The type of encryption that has been applied. Must be one of the {@link C.CryptoMode} values.
*
* @see android.media.MediaCodec.CryptoInfo#mode
*/
@C.CryptoMode public int mode;
/**
* The number of leading unencrypted bytes in each sub-sample. If null, all bytes are treated as
* encrypted and {@link #numBytesOfEncryptedData} must be specified.
*
* @see android.media.MediaCodec.CryptoInfo#numBytesOfClearData
*/
public int[] numBytesOfClearData;
/**
* The number of trailing encrypted bytes in each sub-sample. If null, all bytes are treated as
* clear and {@link #numBytesOfClearData} must be specified.
*
* @see android.media.MediaCodec.CryptoInfo#numBytesOfEncryptedData
*/
public int[] numBytesOfEncryptedData;
/**
* The number of subSamples that make up the buffer's contents.
*
* @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 = new android.media.MediaCodec.CryptoInfo();
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;
// Update frameworkCryptoInfo fields directly because 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);
}
}
/**
* 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.
*/
public android.media.MediaCodec.CryptoInfo getFrameworkCryptoInfo() {
return frameworkCryptoInfo;
}
/** @deprecated Use {@link #getFrameworkCryptoInfo()}. */
@Deprecated
public android.media.MediaCodec.CryptoInfo getFrameworkCryptoInfoV16() {
return getFrameworkCryptoInfo();
}
@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);
}
}
}
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