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1 // Copyright 2015 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #ifndef MEDIA_FORMATS_MP2T_DESCRIPTORS_H_ | |
6 #define MEDIA_FORMATS_MP2T_DESCRIPTORS_H_ | |
7 | |
8 #include <stdint.h> | |
9 | |
10 #include <map> | |
11 #include <string> | |
12 | |
13 namespace media { | |
14 | |
15 class BitReader; | |
16 | |
17 namespace mp2t { | |
18 | |
19 // Representation of a list of descriptors, used in the MPEG-2 Systems standard | |
20 // to extend the definitions of programs or program elements. While the standard | |
21 // appears to permit multiple descriptors in such a list to have the same tag | |
22 // value, the implementation herein will not support this. | |
23 class Descriptors { | |
24 public: | |
25 Descriptors(); | |
26 Descriptors(const Descriptors& other); | |
ddorwin
2016/05/18 20:06:51
OOC, why did this become necessary?
dougsteed
2016/05/26 02:33:15
I think this was a style guide thing. Descriptors
| |
27 ~Descriptors(); | |
28 | |
29 // Attempts to read a (possibly empty) list of descriptors from the |reader|. | |
30 // If |size| > 0, the descriptors must occupy exactly |size| bytes, Otherwise, | |
31 // the descriptors should use all available bits from the reader. | |
32 bool Read(BitReader* reader, int size); | |
33 | |
34 // Indicates whether a Registration descriptor is present. If so, the | |
35 // |format_identifier| and |additional_info| values are populated with the | |
36 // contents of the descriptor. | |
37 bool HasRegistrationDescriptor(int64_t* format_identifier, | |
38 std::string* additional_info) const; | |
39 | |
40 // Indicates whether a CA descriptor is present. If so, the |system_id|, | |
41 // |pid|, and |private_data| values are populated with the contents of the | |
42 // descriptor. | |
43 bool HasCADescriptor(int* system_id, | |
44 int* pid, | |
45 std::string* private_data) const; | |
46 | |
47 // Indicates whether a CA descriptor is present, and if so, whether it is | |
48 // of the type defined by ISO/IEC 23001-9:2014 (i.e. with a specific | |
49 // system_id value and layout of the private_data). If so, the |ca_pid| and | |
50 // |pssh_pid| are populated with the contents of the descriptor. | |
51 bool HasCADescriptorCenc(int* ca_pid, int* pssh_pid) const; | |
52 | |
53 // Indicates whether a Private Data Indicator descriptor is present with a | |
54 // particular |value|. | |
55 bool HasPrivateDataIndicator(int64_t value) const; | |
56 | |
57 private: | |
58 using Descriptor = std::pair<int, std::string>; | |
59 std::map<int, std::string> descriptors_; | |
60 | |
61 // Allow copy and assign so that it can be used in a std C++ container. | |
62 }; | |
63 | |
64 } // namespace mp2t | |
65 } // namespace media | |
66 | |
67 #endif // MEDIA_FORMATS_MP2T_DESCRIPTOR_LIST_H_ | |
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