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

Issue 7523051: Create media.dll / libmedia.so for the component build (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src/
Patch Set: '' Created 9 years, 4 months ago
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1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. 1 // Copyright (c) 2011 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 // Defines various types of timestamped media buffers used for transporting 5 // Defines various types of timestamped media buffers used for transporting
6 // data between filters. Every buffer contains a timestamp in microseconds 6 // data between filters. Every buffer contains a timestamp in microseconds
7 // describing the relative position of the buffer within the media stream, and 7 // describing the relative position of the buffer within the media stream, and
8 // the duration in microseconds for the length of time the buffer will be 8 // the duration in microseconds for the length of time the buffer will be
9 // rendered. 9 // rendered.
10 // 10 //
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23 // Duration*: 40000us 40000us 40000us ... 40000us 23 // Duration*: 40000us 40000us 40000us ... 40000us
24 // 24 //
25 // *25fps = 0.04s per frame = 40000us per frame 25 // *25fps = 0.04s per frame = 40000us per frame
26 26
27 #ifndef MEDIA_BASE_BUFFERS_H_ 27 #ifndef MEDIA_BASE_BUFFERS_H_
28 #define MEDIA_BASE_BUFFERS_H_ 28 #define MEDIA_BASE_BUFFERS_H_
29 29
30 #include "base/basictypes.h" 30 #include "base/basictypes.h"
31 #include "base/memory/ref_counted.h" 31 #include "base/memory/ref_counted.h"
32 #include "base/time.h" 32 #include "base/time.h"
33 #include "media/base/media_api.h"
33 34
34 namespace media { 35 namespace media {
35 36
36 // Indicates an invalid or missing timestamp. 37 // Indicates an invalid or missing timestamp.
37 extern const base::TimeDelta kNoTimestamp; 38 MEDIA_API extern const base::TimeDelta kNoTimestamp;
38 39
39 class StreamSample : public base::RefCountedThreadSafe<StreamSample> { 40 class MEDIA_API StreamSample : public base::RefCountedThreadSafe<StreamSample> {
40 public: 41 public:
41 // Returns the timestamp of this buffer in microseconds. 42 // Returns the timestamp of this buffer in microseconds.
42 base::TimeDelta GetTimestamp() const { 43 base::TimeDelta GetTimestamp() const {
43 return timestamp_; 44 return timestamp_;
44 } 45 }
45 46
46 // Returns the duration of this buffer in microseconds. 47 // Returns the duration of this buffer in microseconds.
47 base::TimeDelta GetDuration() const { 48 base::TimeDelta GetDuration() const {
48 return duration_; 49 return duration_;
49 } 50 }
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69 virtual ~StreamSample(); 70 virtual ~StreamSample();
70 71
71 base::TimeDelta timestamp_; 72 base::TimeDelta timestamp_;
72 base::TimeDelta duration_; 73 base::TimeDelta duration_;
73 74
74 private: 75 private:
75 DISALLOW_COPY_AND_ASSIGN(StreamSample); 76 DISALLOW_COPY_AND_ASSIGN(StreamSample);
76 }; 77 };
77 78
78 79
79 class Buffer : public StreamSample { 80 class MEDIA_API Buffer : public StreamSample {
80 public: 81 public:
81 // Returns a read only pointer to the buffer data. 82 // Returns a read only pointer to the buffer data.
82 virtual const uint8* GetData() const = 0; 83 virtual const uint8* GetData() const = 0;
83 84
84 // Returns the size of valid data in bytes. 85 // Returns the size of valid data in bytes.
85 virtual size_t GetDataSize() const = 0; 86 virtual size_t GetDataSize() const = 0;
86 87
87 // If there's no data in this buffer, it represents end of stream. 88 // If there's no data in this buffer, it represents end of stream.
88 virtual bool IsEndOfStream() const; 89 virtual bool IsEndOfStream() const;
89 90
90 protected: 91 protected:
91 virtual ~Buffer() {} 92 virtual ~Buffer() {}
92 }; 93 };
93 94
94 } // namespace media 95 } // namespace media
95 96
96 #endif // MEDIA_BASE_BUFFERS_H_ 97 #endif // MEDIA_BASE_BUFFERS_H_
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