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Side by Side Diff: media/base/audio_timestamp_helper.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 (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_AUDIO_TIMESTAMP_HELPER_H_ 5 #ifndef MEDIA_BASE_AUDIO_TIMESTAMP_HELPER_H_
6 #define MEDIA_BASE_AUDIO_TIMESTAMP_HELPER_H_ 6 #define MEDIA_BASE_AUDIO_TIMESTAMP_HELPER_H_
7 7
8 #include "base/time/time.h" 8 #include "base/time/time.h"
9 #include "media/base/media_export.h" 9 #include "media/base/media_export.h"
10 10
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26 // determines the number of frames that need to be added/removed from the 26 // determines the number of frames that need to be added/removed from the
27 // accumulated frames to reach a target timestamp. 27 // accumulated frames to reach a target timestamp.
28 class MEDIA_EXPORT AudioTimestampHelper { 28 class MEDIA_EXPORT AudioTimestampHelper {
29 public: 29 public:
30 explicit AudioTimestampHelper(int samples_per_second); 30 explicit AudioTimestampHelper(int samples_per_second);
31 31
32 // Sets the base timestamp to |base_timestamp| and the sets count to 0. 32 // Sets the base timestamp to |base_timestamp| and the sets count to 0.
33 void SetBaseTimestamp(base::TimeDelta base_timestamp); 33 void SetBaseTimestamp(base::TimeDelta base_timestamp);
34 34
35 base::TimeDelta base_timestamp() const; 35 base::TimeDelta base_timestamp() const;
36 int64 frame_count() const { return frame_count_; } 36 int64_t frame_count() const { return frame_count_; }
37 37
38 // Adds |frame_count| to the frame counter. 38 // Adds |frame_count| to the frame counter.
39 // Note: SetBaseTimestamp() must be called with a value other than 39 // Note: SetBaseTimestamp() must be called with a value other than
40 // kNoTimestamp() before this method can be called. 40 // kNoTimestamp() before this method can be called.
41 void AddFrames(int frame_count); 41 void AddFrames(int frame_count);
42 42
43 // Get the current timestamp. This value is computed from the base_timestamp() 43 // Get the current timestamp. This value is computed from the base_timestamp()
44 // and the number of sample frames that have been added so far. 44 // and the number of sample frames that have been added so far.
45 base::TimeDelta GetTimestamp() const; 45 base::TimeDelta GetTimestamp() const;
46 46
47 // Gets the duration if |frame_count| frames were added to the current 47 // Gets the duration if |frame_count| frames were added to the current
48 // timestamp reported by GetTimestamp(). This method ensures that 48 // timestamp reported by GetTimestamp(). This method ensures that
49 // (GetTimestamp() + GetFrameDuration(n)) will equal the timestamp that 49 // (GetTimestamp() + GetFrameDuration(n)) will equal the timestamp that
50 // GetTimestamp() will return if AddFrames(n) is called. 50 // GetTimestamp() will return if AddFrames(n) is called.
51 base::TimeDelta GetFrameDuration(int frame_count) const; 51 base::TimeDelta GetFrameDuration(int frame_count) const;
52 52
53 // Returns the number of frames needed to reach the target timestamp. 53 // Returns the number of frames needed to reach the target timestamp.
54 // Note: |target| must be >= |base_timestamp_|. 54 // Note: |target| must be >= |base_timestamp_|.
55 int64 GetFramesToTarget(base::TimeDelta target) const; 55 int64_t GetFramesToTarget(base::TimeDelta target) const;
56 56
57 private: 57 private:
58 base::TimeDelta ComputeTimestamp(int64 frame_count) const; 58 base::TimeDelta ComputeTimestamp(int64_t frame_count) const;
59 59
60 double microseconds_per_frame_; 60 double microseconds_per_frame_;
61 61
62 base::TimeDelta base_timestamp_; 62 base::TimeDelta base_timestamp_;
63 63
64 // Number of frames accumulated by AddFrames() calls. 64 // Number of frames accumulated by AddFrames() calls.
65 int64 frame_count_; 65 int64_t frame_count_;
66 66
67 DISALLOW_IMPLICIT_CONSTRUCTORS(AudioTimestampHelper); 67 DISALLOW_IMPLICIT_CONSTRUCTORS(AudioTimestampHelper);
68 }; 68 };
69 69
70 } // namespace media 70 } // namespace media
71 71
72 #endif 72 #endif
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