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Side by Side Diff: media/base/subsample_entry.h

Issue 2132653002: MediaCodecLoop unit tests (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: cl feedback Created 4 years, 4 months ago
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1 // Copyright 2015 The Chromium Authors. All rights reserved. 1 // Copyright 2016 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 #ifndef CHROMECAST_PUBLIC_MEDIA_CAST_DECRYPT_CONFIG_H_ 5 #ifndef MEDIA_BASE_SUBSAMPLE_ENTRY_H_
6 #define CHROMECAST_PUBLIC_MEDIA_CAST_DECRYPT_CONFIG_H_ 6 #define MEDIA_BASE_SUBSAMPLE_ENTRY_H_
7 7
8 #include <stdint.h> 8 #include <stdint.h>
9 #include <string>
10 #include <vector>
11 9
12 namespace chromecast {
13 namespace media { 10 namespace media {
14 11
15 // The Common Encryption spec provides for subsample encryption, where portions 12 // The Common Encryption spec provides for subsample encryption, where portions
16 // of a sample are set in cleartext. A SubsampleEntry specifies the number of 13 // of a sample are set in cleartext. A SubsampleEntry specifies the number of
17 // clear and encrypted bytes in each subsample. For decryption, all of the 14 // clear and encrypted bytes in each subsample. For decryption, all of the
18 // encrypted bytes in a sample should be considered a single logical stream, 15 // encrypted bytes in a sample should be considered a single logical stream,
19 // regardless of how they are divided into subsamples, and the clear bytes 16 // regardless of how they are divided into subsamples, and the clear bytes
20 // should not be considered as part of decryption. This is logically equivalent 17 // should not be considered as part of decryption. This is logically equivalent
21 // to concatenating all 'cypher_bytes' portions of subsamples, decrypting that 18 // to concatenating all 'cypher_bytes' portions of subsamples, decrypting that
22 // result, and then copying each byte from the decrypted block over the 19 // result, and then copying each byte from the decrypted block over the
23 // position of the corresponding encrypted byte. 20 // position of the corresponding encrypted byte.
24 struct SubsampleEntry { 21 struct SubsampleEntry {
25 SubsampleEntry() : clear_bytes(0), cypher_bytes(0) {} 22 SubsampleEntry() : clear_bytes(0), cypher_bytes(0) {}
26 SubsampleEntry(uint32_t clear_bytes, uint32_t cypher_bytes) 23 SubsampleEntry(uint32_t clear_bytes, uint32_t cypher_bytes)
27 : clear_bytes(clear_bytes), cypher_bytes(cypher_bytes) {} 24 : clear_bytes(clear_bytes), cypher_bytes(cypher_bytes) {}
28 uint32_t clear_bytes; 25 uint32_t clear_bytes;
29 uint32_t cypher_bytes; 26 uint32_t cypher_bytes;
30 }; 27 };
31 28
32 // Contains all metadata needed to decrypt a media sample. 29 } // namespace media
33 class CastDecryptConfig {
34 public:
35 virtual ~CastDecryptConfig() {}
36 30
37 // Returns the ID for this sample's decryption key. 31 #endif // MEDIA_BASE_SUBSAMPLE_ENTRY_H_
38 virtual const std::string& key_id() const = 0;
39
40 // Returns the initialization vector as defined by the encryption format.
41 virtual const std::string& iv() const = 0;
42
43 // Returns the clear and encrypted portions of the sample as described above.
44 virtual const std::vector<SubsampleEntry>& subsamples() const = 0;
45 };
46
47 } // namespace media
48 } // namespace chromecast
49
50 #endif // CHROMECAST_PUBLIC_MEDIA_CAST_DECRYPT_CONFIG_H_
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