| // Copyright 2015 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef MEDIA_AUDIO_AUDIO_STREAMS_TRACKER_H_ |
| #define MEDIA_AUDIO_AUDIO_STREAMS_TRACKER_H_ |
| |
| #include <stddef.h> |
| |
| #include "base/gtest_prod_util.h" |
| #include "base/macros.h" |
| #include "base/threading/thread_checker.h" |
| #include "media/base/media_export.h" |
| |
| namespace media { |
| |
| // Tracks the maximum number of simultaneous streams that was ever registered. |
| // All functions must be called on the same thread. |
| class MEDIA_EXPORT AudioStreamsTracker { |
| public: |
| AudioStreamsTracker(); |
| ~AudioStreamsTracker(); |
| |
| // Increases/decreases current stream count. Updates max stream count if |
| // current count is larger. |
| void IncreaseStreamCount(); |
| void DecreaseStreamCount(); |
| |
| // Resets the max stream count, i.e. sets it to the current stream count. |
| void ResetMaxStreamCount(); |
| |
| size_t max_stream_count() const; |
| |
| private: |
| FRIEND_TEST_ALL_PREFIXES(AudioStreamsTrackerTest, IncreaseAndDecreaseOnce); |
| FRIEND_TEST_ALL_PREFIXES(AudioStreamsTrackerTest, |
| IncreaseAndDecreaseMultiple); |
| |
| // Confirms single-threaded access. |
| base::ThreadChecker thread_checker_; |
| |
| // Stores the current and maximum number of streams. |
| size_t current_stream_count_; |
| size_t max_stream_count_; |
| |
| DISALLOW_COPY_AND_ASSIGN(AudioStreamsTracker); |
| }; |
| |
| } // namespace media |
| |
| #endif // MEDIA_AUDIO_AUDIO_STREAMS_TRACKER_H_ |