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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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