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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 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 MEDIA_BASE_BIT_READER_H_ | 5 #ifndef MEDIA_BASE_BIT_READER_H_ |
6 #define MEDIA_BASE_BIT_READER_H_ | 6 #define MEDIA_BASE_BIT_READER_H_ |
7 | 7 |
8 #include <string> | |
9 | |
8 #include "base/basictypes.h" | 10 #include "base/basictypes.h" |
9 #include "base/compiler_specific.h" | 11 #include "base/compiler_specific.h" |
10 #include "base/memory/scoped_ptr.h" | 12 #include "base/memory/scoped_ptr.h" |
11 #include "media/base/bit_reader_core.h" | 13 #include "media/base/bit_reader_core.h" |
12 #include "media/base/media_export.h" | 14 #include "media/base/media_export.h" |
13 | 15 |
14 namespace media { | 16 namespace media { |
15 | 17 |
16 class MEDIA_EXPORT BitReader | 18 class MEDIA_EXPORT BitReader |
17 : NON_EXPORTED_BASE(private BitReaderCore::ByteStreamProvider) { | 19 : NON_EXPORTED_BASE(private BitReaderCore::ByteStreamProvider) { |
18 public: | 20 public: |
19 // Initialize the reader to start reading at |data|, |size| being size | 21 // Initialize the reader to start reading at |data|, |size| being size |
20 // of |data| in bytes. | 22 // of |data| in bytes. |
21 BitReader(const uint8* data, int size); | 23 BitReader(const uint8* data, int size); |
22 ~BitReader() override; | 24 ~BitReader() override; |
23 | 25 |
24 template<typename T> bool ReadBits(int num_bits, T* out) { | 26 template<typename T> bool ReadBits(int num_bits, T* out) { |
25 return bit_reader_core_.ReadBits(num_bits, out); | 27 return bit_reader_core_.ReadBits(num_bits, out); |
26 } | 28 } |
27 | 29 |
28 bool ReadFlag(bool* flag) { | 30 bool ReadFlag(bool* flag) { |
29 return bit_reader_core_.ReadFlag(flag); | 31 return bit_reader_core_.ReadFlag(flag); |
30 } | 32 } |
31 | 33 |
32 bool SkipBits(int num_bits) { | 34 bool SkipBits(int num_bits) { |
33 return bit_reader_core_.SkipBits(num_bits); | 35 return bit_reader_core_.SkipBits(num_bits); |
34 } | 36 } |
35 | 37 |
38 // Read |num_bits| of binary data into |str|. |num_bits| must be a multiple | |
ddorwin
2015/12/10 20:10:58
nit: move up with the other Read*().
dougsteed
2015/12/14 22:51:46
Done.
| |
39 // of 8. This is not efficient for extracting large strings. | |
40 bool ReadString(int num_bits, std::string* str); | |
41 | |
36 int bits_available() const { | 42 int bits_available() const { |
37 return initial_size_ * 8 - bits_read(); | 43 return initial_size_ * 8 - bits_read(); |
38 } | 44 } |
39 | 45 |
40 int bits_read() const { | 46 int bits_read() const { |
41 return bit_reader_core_.bits_read(); | 47 return bit_reader_core_.bits_read(); |
42 } | 48 } |
43 | 49 |
44 private: | 50 private: |
45 // BitReaderCore::ByteStreamProvider implementation. | 51 // BitReaderCore::ByteStreamProvider implementation. |
46 int GetBytes(int max_n, const uint8** out) override; | 52 int GetBytes(int max_n, const uint8** out) override; |
47 | 53 |
48 // Total number of bytes that was initially passed to BitReader. | 54 // Total number of bytes that was initially passed to BitReader. |
49 const int initial_size_; | 55 const int initial_size_; |
50 | 56 |
51 // Pointer to the next unread byte in the stream. | 57 // Pointer to the next unread byte in the stream. |
52 const uint8* data_; | 58 const uint8* data_; |
53 | 59 |
54 // Bytes left in the stream. | 60 // Bytes left in the stream. |
55 int bytes_left_; | 61 int bytes_left_; |
56 | 62 |
57 BitReaderCore bit_reader_core_; | 63 BitReaderCore bit_reader_core_; |
58 | 64 |
59 DISALLOW_COPY_AND_ASSIGN(BitReader); | 65 DISALLOW_COPY_AND_ASSIGN(BitReader); |
60 }; | 66 }; |
61 | 67 |
62 } // namespace media | 68 } // namespace media |
63 | 69 |
64 #endif // MEDIA_BASE_BIT_READER_H_ | 70 #endif // MEDIA_BASE_BIT_READER_H_ |
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