| // Copyright 2016 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef COBALT_MEDIA_BASE_SUBSAMPLE_ENTRY_H_ |
| #define COBALT_MEDIA_BASE_SUBSAMPLE_ENTRY_H_ |
| |
| #include "starboard/types.h" |
| |
| namespace cobalt { |
| namespace media { |
| |
| // The Common Encryption spec provides for subsample encryption, where portions |
| // of a sample are set in cleartext. A SubsampleEntry specifies the number of |
| // clear and encrypted bytes in each subsample. For decryption, all of the |
| // encrypted bytes in a sample should be considered a single logical stream, |
| // regardless of how they are divided into subsamples, and the clear bytes |
| // should not be considered as part of decryption. This is logically equivalent |
| // to concatenating all 'cypher_bytes' portions of subsamples, decrypting that |
| // result, and then copying each byte from the decrypted block over the |
| // position of the corresponding encrypted byte. |
| struct SubsampleEntry { |
| SubsampleEntry() : clear_bytes(0), cypher_bytes(0) {} |
| SubsampleEntry(uint32_t clear_bytes, uint32_t cypher_bytes) |
| : clear_bytes(clear_bytes), cypher_bytes(cypher_bytes) {} |
| uint32_t clear_bytes; |
| uint32_t cypher_bytes; |
| }; |
| |
| } // namespace media |
| } // namespace cobalt |
| |
| #endif // COBALT_MEDIA_BASE_SUBSAMPLE_ENTRY_H_ |