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Side by Side Diff: media/formats/common/offset_byte_queue.h

Issue 1534273002: Switch to standard integer types in media/. (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: more Created 5 years ago
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1 // Copyright 2014 The Chromium Authors. All rights reserved. 1 // Copyright 2014 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_FORMATS_COMMON_OFFSET_BYTE_QUEUE_H_ 5 #ifndef MEDIA_FORMATS_COMMON_OFFSET_BYTE_QUEUE_H_
6 #define MEDIA_FORMATS_COMMON_OFFSET_BYTE_QUEUE_H_ 6 #define MEDIA_FORMATS_COMMON_OFFSET_BYTE_QUEUE_H_
7 7
8 #include "base/basictypes.h"
9 #include "media/base/byte_queue.h" 8 #include "media/base/byte_queue.h"
10 #include "media/base/media_export.h" 9 #include "media/base/media_export.h"
11 10
12 namespace media { 11 namespace media {
13 12
14 // A wrapper around a ByteQueue which maintains a notion of a 13 // A wrapper around a ByteQueue which maintains a notion of a
15 // monotonically-increasing offset. All buffer access is done by passing these 14 // monotonically-increasing offset. All buffer access is done by passing these
16 // offsets into this class, going some way towards preventing the proliferation 15 // offsets into this class, going some way towards preventing the proliferation
17 // of many different meanings of "offset", "head", etc. 16 // of many different meanings of "offset", "head", etc.
18 class MEDIA_EXPORT OffsetByteQueue { 17 class MEDIA_EXPORT OffsetByteQueue {
19 public: 18 public:
20 OffsetByteQueue(); 19 OffsetByteQueue();
21 ~OffsetByteQueue(); 20 ~OffsetByteQueue();
22 21
23 // These work like their underlying ByteQueue counterparts. 22 // These work like their underlying ByteQueue counterparts.
24 void Reset(); 23 void Reset();
25 void Push(const uint8* buf, int size); 24 void Push(const uint8_t* buf, int size);
26 void Peek(const uint8** buf, int* size); 25 void Peek(const uint8_t** buf, int* size);
27 void Pop(int count); 26 void Pop(int count);
28 27
29 // Sets |buf| to point at the first buffered byte corresponding to |offset|, 28 // Sets |buf| to point at the first buffered byte corresponding to |offset|,
30 // and |size| to the number of bytes available starting from that offset. 29 // and |size| to the number of bytes available starting from that offset.
31 // 30 //
32 // It is an error if the offset is before the current head. It's not an error 31 // It is an error if the offset is before the current head. It's not an error
33 // if the current offset is beyond tail(), but you will of course get back 32 // if the current offset is beyond tail(), but you will of course get back
34 // a null |buf| and a |size| of zero. 33 // a null |buf| and a |size| of zero.
35 void PeekAt(int64 offset, const uint8** buf, int* size); 34 void PeekAt(int64_t offset, const uint8_t** buf, int* size);
36 35
37 // Marks the bytes up to (but not including) |max_offset| as ready for 36 // Marks the bytes up to (but not including) |max_offset| as ready for
38 // deletion. This is relatively inexpensive, but will not necessarily reduce 37 // deletion. This is relatively inexpensive, but will not necessarily reduce
39 // the resident buffer size right away (or ever). 38 // the resident buffer size right away (or ever).
40 // 39 //
41 // Returns true if the full range of bytes were successfully trimmed, 40 // Returns true if the full range of bytes were successfully trimmed,
42 // including the case where |max_offset| is less than the current head. 41 // including the case where |max_offset| is less than the current head.
43 // Returns false if |max_offset| > tail() (although all bytes currently 42 // Returns false if |max_offset| > tail() (although all bytes currently
44 // buffered are still cleared). 43 // buffered are still cleared).
45 bool Trim(int64 max_offset); 44 bool Trim(int64_t max_offset);
46 45
47 // The head and tail positions, in terms of the file's absolute offsets. 46 // The head and tail positions, in terms of the file's absolute offsets.
48 // tail() is an exclusive bound. 47 // tail() is an exclusive bound.
49 int64 head() { return head_; } 48 int64_t head() { return head_; }
50 int64 tail() { return head_ + size_; } 49 int64_t tail() { return head_ + size_; }
51 50
52 private: 51 private:
53 // Synchronize |buf_| and |size_| with |queue_|. 52 // Synchronize |buf_| and |size_| with |queue_|.
54 void Sync(); 53 void Sync();
55 54
56 ByteQueue queue_; 55 ByteQueue queue_;
57 const uint8* buf_; 56 const uint8_t* buf_;
58 int size_; 57 int size_;
59 int64 head_; 58 int64_t head_;
60 59
61 DISALLOW_COPY_AND_ASSIGN(OffsetByteQueue); 60 DISALLOW_COPY_AND_ASSIGN(OffsetByteQueue);
62 }; 61 };
63 62
64 } // namespace media 63 } // namespace media
65 64
66 #endif // MEDIA_FORMATS_COMMON_OFFSET_BYTE_QUEUE_H_ 65 #endif // MEDIA_FORMATS_COMMON_OFFSET_BYTE_QUEUE_H_
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