1/*
2 * Copyright (C) 2017 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef SAMPLE_AES_PROCESSOR_H_
18
19#define SAMPLE_AES_PROCESSOR_H_
20
21#include <media/stagefright/foundation/AMessage.h>
22#include <media/stagefright/foundation/AString.h>
23
24#include <openssl/aes.h>
25
26#include <utils/Errors.h>
27#include <utils/List.h>
28#include <utils/RefBase.h>
29#include <utils/Vector.h>
30
31namespace android {
32
33struct HlsSampleDecryptor : RefBase {
34
35    HlsSampleDecryptor();
36    explicit HlsSampleDecryptor(const sp<AMessage> &sampleAesKeyItem);
37
38    void signalNewSampleAesKey(const sp<AMessage> &sampleAesKeyItem);
39
40    size_t processNal(uint8_t *nalData, size_t nalSize);
41    void processAAC(size_t adtsHdrSize, uint8_t *data, size_t size);
42    void processAC3(uint8_t *data, size_t size);
43
44    static AString aesBlockToStr(uint8_t block[AES_BLOCK_SIZE]);
45
46private:
47    size_t unescapeStream(uint8_t *data, size_t limit) const;
48    size_t findNextUnescapeIndex(uint8_t *data, size_t offset, size_t limit) const;
49    status_t decryptBlock(uint8_t *buffer, size_t size, uint8_t AESInitVec[AES_BLOCK_SIZE]);
50
51    static const int VIDEO_CLEAR_LEAD = 32;
52    static const int AUDIO_CLEAR_LEAD = 16;
53
54    AES_KEY mAesKey;
55    uint8_t mAESInitVec[AES_BLOCK_SIZE];
56    bool mValidKeyInfo;
57
58    DISALLOW_EVIL_CONSTRUCTORS(HlsSampleDecryptor);
59};
60
61}  // namespace android
62
63#endif // SAMPLE_AES_PROCESSOR_H_
64