Implement the NackModule as part of the new jitter buffer.

webrtc/modules/video_coding/distribution.h

+/*
+ *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_MODULES_VIDEO_CODING_DISTRIBUTION_H_
+#define WEBRTC_MODULES_VIDEO_CODING_DISTRIBUTION_H_
+
+#include <vector>
+
+namespace webrtc {
+class Distribution {

[stefan-webrtc, 2016/03/01 08:52:10]

Prefer calling this Histogram. To me, a distribution is the underlying model
we're trying to estimate with the histogram.

[philipel, 2016/03/01 10:27:06]

Done.

+ public:
+  Distribution(int num_buckets, int max_num_values);
+
+  // Add a value to the distribution. If there already is
+  // max_num_values in the distribution then the oldest
+  // value will also be removed.
+  void AddValue(int value);

[stefan-webrtc, 2016/03/01 08:52:10]

Maybe just Add(int value)?

[philipel, 2016/03/01 10:27:06]

Done.

+
+  // Calculates how many buckets have to be summed in
+  // order to accumulate at least the given probability.
+  size_t InverseCDF(float probability) const;
+
+  // How many values that makes up this distribution.

[stefan-webrtc, 2016/03/01 08:52:10]

make up

[philipel, 2016/03/01 10:27:06]

Done.

+  size_t NumValues() const;
+
+ private:
+  std::vector<int> values_;

[stefan-webrtc, 2016/03/01 08:52:10]

Comment on that this is a circular buffer of values?

[philipel, 2016/03/01 10:27:06]

Done.

+  std::vector<int> buckets_;
+  size_t index_;
+};
+
+}  // namespace webrtc
+
+#endif  // WEBRTC_MODULES_VIDEO_CODING_DISTRIBUTION_H_