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86 lines
2.8 KiB
86 lines
2.8 KiB
/* |
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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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