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