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1 /*
2  * Apple HTTP Live Streaming Sample Encryption/Decryption
3  *
4  * Copyright (c) 2021 Nachiket Tarate
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 /**
24  * @file
25  * Apple HTTP Live Streaming Sample Encryption
26  * https://developer.apple.com/library/ios/documentation/AudioVideo/Conceptual/HLS_Sample_Encryption
27  */
28 
29 #ifndef AVFORMAT_HLS_SAMPLE_ENCRYPTION_H
30 #define AVFORMAT_HLS_SAMPLE_ENCRYPTION_H
31 
32 #include <stddef.h>
33 #include <stdint.h>
34 
35 #include "libavcodec/codec_id.h"
36 #include "libavcodec/packet.h"
37 #include "avformat.h"
38 
39 
40 #define HLS_MAX_ID3_TAGS_DATA_LEN       138
41 #define HLS_MAX_AUDIO_SETUP_DATA_LEN    10
42 
43 typedef struct HLSCryptoContext {
44     struct AVAES    *aes_ctx;
45     uint8_t         key[16];
46     uint8_t         iv[16];
47 } HLSCryptoContext;
48 
49 typedef struct HLSAudioSetupInfo {
50     enum AVCodecID      codec_id;
51     uint32_t            codec_tag;
52     uint16_t            priming;
53     uint8_t             version;
54     uint8_t             setup_data_length;
55     uint8_t             setup_data[HLS_MAX_AUDIO_SETUP_DATA_LEN];
56 } HLSAudioSetupInfo;
57 
58 
59 void ff_hls_senc_read_audio_setup_info(HLSAudioSetupInfo *info, const uint8_t *buf, size_t size);
60 
61 int ff_hls_senc_parse_audio_setup_info(AVStream *st, HLSAudioSetupInfo *info);
62 
63 int ff_hls_senc_decrypt_frame(enum AVCodecID codec_id, HLSCryptoContext *crypto_ctx, AVPacket *pkt);
64 
65 #endif /* AVFORMAT_HLS_SAMPLE_ENCRYPTION_H */
66 
67