libavformat/hls_sample_encryption.h

   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 */