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87 lines
2.8 KiB
C
87 lines
2.8 KiB
C
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/*
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* MOV CENC (Common Encryption) writer
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* Copyright (c) 2015 Eran Kornblau <erankor at gmail dot com>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVFORMAT_MOVENCCENC_H
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#define AVFORMAT_MOVENCCENC_H
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#include "libavutil/aes_ctr.h"
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#include "avformat.h"
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#include "avio.h"
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#define CENC_KID_SIZE (16)
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struct MOVTrack;
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typedef struct {
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struct AVAESCTR* aes_ctr;
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uint8_t* auxiliary_info;
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size_t auxiliary_info_size;
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size_t auxiliary_info_alloc_size;
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uint32_t auxiliary_info_entries;
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/* subsample support */
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int use_subsamples;
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uint16_t subsample_count;
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size_t auxiliary_info_subsample_start;
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uint8_t* auxiliary_info_sizes;
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size_t auxiliary_info_sizes_alloc_size;
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} MOVMuxCencContext;
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/**
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* Initialize a CENC context
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* @param key encryption key, must have a length of AES_CTR_KEY_SIZE
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* @param use_subsamples when enabled parts of a packet can be encrypted, otherwise the whole packet is encrypted
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*/
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int ff_mov_cenc_init(MOVMuxCencContext* ctx, uint8_t* encryption_key, int use_subsamples, int bitexact);
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/**
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* Free a CENC context
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*/
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void ff_mov_cenc_free(MOVMuxCencContext* ctx);
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/**
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* Write a fully encrypted packet
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*/
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int ff_mov_cenc_write_packet(MOVMuxCencContext* ctx, AVIOContext *pb, const uint8_t *buf_in, int size);
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/**
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* Parse AVC NAL units from annex B format, the nal size and type are written in the clear while the body is encrypted
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*/
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int ff_mov_cenc_avc_parse_nal_units(MOVMuxCencContext* ctx, AVIOContext *pb, const uint8_t *buf_in, int size);
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/**
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* Write AVC NAL units that are in MP4 format, the nal size and type are written in the clear while the body is encrypted
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*/
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int ff_mov_cenc_avc_write_nal_units(AVFormatContext *s, MOVMuxCencContext* ctx, int nal_length_size,
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AVIOContext *pb, const uint8_t *buf_in, int size);
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/**
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* Write the cenc atoms that should reside inside stbl
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*/
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void ff_mov_cenc_write_stbl_atoms(MOVMuxCencContext* ctx, AVIOContext *pb);
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/**
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* Write the sinf atom, contained inside stsd
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*/
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int ff_mov_cenc_write_sinf_tag(struct MOVTrack* track, AVIOContext *pb, uint8_t* kid);
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#endif /* AVFORMAT_MOVENCCENC_H */
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