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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_FILTERS_VP9_RAW_BITS_READER_ | |
6 #define MEDIA_FILTERS_VP9_RAW_BITS_READER_ | |
7 | |
8 #include <stddef.h> | |
9 #include <stdint.h> | |
10 | |
11 #include "base/macros.h" | |
12 #include "base/memory/scoped_ptr.h" | |
13 #include "media/base/media_export.h" | |
14 | |
15 namespace media { | |
16 | |
17 class BitReader; | |
18 | |
19 // A class to read raw bits stream. See VP9 spec, "RAW-BITS DECODING" section | |
20 // for detail. | |
21 class MEDIA_EXPORT Vp9RawBitsReader { | |
22 public: | |
23 Vp9RawBitsReader(); | |
24 ~Vp9RawBitsReader(); | |
25 | |
26 // |data| is the input buffer with |size| bytes. | |
27 void Initialize(const uint8_t* data, size_t size); | |
28 | |
29 // Returns true if last reads go beyond the end of buffer. | |
30 bool IsOutOfBuffer() const { return out_of_buffer_; } | |
31 | |
32 // Returns how many bytes read. Partial bytes will be counted as one byte. | |
Pawel Osciak
2015/08/02 10:46:11
s/how many bytes read/how many bytes were read sin
kcwu
2015/08/03 07:10:13
Done.
| |
33 // For example, it will return 1 if 3 bits read. | |
Pawel Osciak
2015/08/02 10:46:11
s/read/were read/
kcwu
2015/08/03 07:10:13
Done.
| |
34 size_t GetBytesRead() const; | |
35 | |
36 // Reads one bit. | |
37 // If the read goes beyond the end of buffer, the return value is undefined. | |
38 int ReadBit(); | |
39 | |
40 // Reads a literal with |bits| bits. | |
41 // If the read goes beyond the end of buffer, the return value is undefined. | |
42 int ReadLiteral(int bits); | |
43 | |
44 // Reads a signed literal with |bits| bits (not including the sign bit). | |
45 // If the read goes beyond the end of buffer, the return value is undefined. | |
46 int ReadSignedLiteral(int bits); | |
47 | |
48 private: | |
49 scoped_ptr<BitReader> reader_; | |
50 | |
51 // Indicates error status that the caller reads beyond the end of input | |
52 // buffer. | |
53 bool out_of_buffer_; | |
54 | |
55 DISALLOW_COPY_AND_ASSIGN(Vp9RawBitsReader); | |
56 }; | |
57 | |
58 } // namespace media | |
59 | |
60 #endif // MEDIA_FILTERS_VP9_RAW_BITS_READER_ | |
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