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

Issue 3176026: FBTF: Remove unneeded headers from base/ (part 7) (Closed) Base URL: svn://chrome-svn/chrome/trunk/src/
Patch Set: '' Created 10 years, 3 months ago
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1 // Copyright (c) 2010 The Chromium Authors. All rights reserved. 1 // Copyright (c) 2010 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 //
11 // Timestamps are derived directly from the encoded media file and are commonly 11 // Timestamps are derived directly from the encoded media file and are commonly
12 // known as the presentation timestamp (PTS). Durations are a best-guess and 12 // known as the presentation timestamp (PTS). Durations are a best-guess and
13 // are usually derived from the sample/frame rate of the media file. 13 // are usually derived from the sample/frame rate of the media file.
14 // 14 //
15 // Due to encoding and transmission errors, it is not guaranteed that timestamps 15 // Due to encoding and transmission errors, it is not guaranteed that timestamps
16 // arrive in a monotonically increasing order nor that the next timestamp will 16 // arrive in a monotonically increasing order nor that the next timestamp will
17 // be equal to the previous timestamp plus the duration. 17 // be equal to the previous timestamp plus the duration.
18 // 18 //
19 // In the ideal scenario for a 25fps movie, buffers are timestamped as followed: 19 // In the ideal scenario for a 25fps movie, buffers are timestamped as followed:
20 // 20 //
21 // Buffer0 Buffer1 Buffer2 ... BufferN 21 // Buffer0 Buffer1 Buffer2 ... BufferN
22 // Timestamp: 0us 40000us 80000us ... (N*40000)us 22 // Timestamp: 0us 40000us 80000us ... (N*40000)us
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/logging.h" 30 #include "base/basictypes.h"
31 #include "base/ref_counted.h" 31 #include "base/ref_counted.h"
32 #include "base/time.h" 32 #include "base/time.h"
33 33
34 namespace media { 34 namespace media {
35 35
36 class StreamSample : public base::RefCountedThreadSafe<StreamSample> { 36 class StreamSample : public base::RefCountedThreadSafe<StreamSample> {
37 public: 37 public:
38 // Constant timestamp value to indicate an invalid or missing timestamp. 38 // Constant timestamp value to indicate an invalid or missing timestamp.
39 static const base::TimeDelta kInvalidTimestamp; 39 static const base::TimeDelta kInvalidTimestamp;
40 40
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118 // Returns the size of the underlying buffer. 118 // Returns the size of the underlying buffer.
119 virtual size_t GetBufferSize() const = 0; 119 virtual size_t GetBufferSize() const = 0;
120 120
121 protected: 121 protected:
122 virtual ~WritableBuffer() {} 122 virtual ~WritableBuffer() {}
123 }; 123 };
124 124
125 } // namespace media 125 } // namespace media
126 126
127 #endif // MEDIA_BASE_BUFFERS_H_ 127 #endif // MEDIA_BASE_BUFFERS_H_
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