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