chromium/third_party/ffmpeg/libavutil/encryption_info.c

/**
 * 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
 */

#include <string.h>

#include "encryption_info.h"
#include "mem.h"
#include "intreadwrite.h"

#define FF_ENCRYPTION_INFO_EXTRA …

// The format of the AVEncryptionInfo side data:
// u32be scheme
// u32be crypt_byte_block
// u32be skip_byte_block
// u32be key_id_size
// u32be iv_size
// u32be subsample_count
// u8[key_id_size] key_id
// u8[iv_size] iv
// {
//   u32be bytes_of_clear_data
//   u32be bytes_of_protected_data
// }[subsample_count]

AVEncryptionInfo *av_encryption_info_alloc(uint32_t subsample_count, uint32_t key_id_size, uint32_t iv_size)
{ … }

AVEncryptionInfo *av_encryption_info_clone(const AVEncryptionInfo *info)
{ … }

void av_encryption_info_free(AVEncryptionInfo *info)
{ … }

AVEncryptionInfo *av_encryption_info_get_side_data(const uint8_t* buffer, size_t size)
{ … }

uint8_t *av_encryption_info_add_side_data(const AVEncryptionInfo *info, size_t *size)
{ … }

// The format of the AVEncryptionInitInfo side data:
// u32be init_info_count
// {
//   u32be system_id_size
//   u32be num_key_ids
//   u32be key_id_size
//   u32be data_size
//   u8[system_id_size] system_id
//   u8[key_id_size][num_key_id] key_ids
//   u8[data_size] data
// }[init_info_count]

#define FF_ENCRYPTION_INIT_INFO_EXTRA …

AVEncryptionInitInfo *av_encryption_init_info_alloc(
    uint32_t system_id_size, uint32_t num_key_ids, uint32_t key_id_size, uint32_t data_size)
{ … }

void av_encryption_init_info_free(AVEncryptionInitInfo *info)
{ … }

AVEncryptionInitInfo *av_encryption_init_info_get_side_data(
    const uint8_t *side_data, size_t side_data_size)
{ … }

uint8_t *av_encryption_init_info_add_side_data(const AVEncryptionInitInfo *info, size_t *side_data_size)
{ … }