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// 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(size_t count = 1);
// 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_