Reland of BWE allocation strategy

TBR=stefan@webrtc.org,alexnarest@webrtc.org

Bug: webrtc:8243
Change-Id: Ie68e4f414b2ac32ba4e64877cb250fabcb089a07
Reviewed-on: https://webrtc-review.googlesource.com/13940
Commit-Queue: Alex Narest <alexnarest@webrtc.org>
Reviewed-by: Alex Narest <alexnarest@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#20369}

rtc_base/bitrateallocationstrategy.h

@@ -0,0 +1,101 @@
+/*
+ *  Copyright 2017 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 RTC_BASE_BITRATEALLOCATIONSTRATEGY_H_
+#define RTC_BASE_BITRATEALLOCATIONSTRATEGY_H_
+
+#include <map>
+#include <memory>
+#include <string>
+#include <vector>
+#include "api/array_view.h"
+#include "rtc_base/checks.h"
+
+namespace rtc {
+
+// Pluggable strategy allows configuration of bitrate allocation per media
+// track.
+//
+// The strategy should provide allocation for every track passed with
+// track_configs in AllocateBitrates. The allocations are constrained by
+// max_bitrate_bps, min_bitrate_bps defining the track supported range and
+// enforce_min_bitrate indicating if the track my be paused by allocating 0
+// bitrate.
+class BitrateAllocationStrategy {
+ public:
+  struct TrackConfig {
+    TrackConfig(uint32_t min_bitrate_bps,
+                uint32_t max_bitrate_bps,
+                bool enforce_min_bitrate,
+                std::string track_id)
+        : min_bitrate_bps(min_bitrate_bps),
+          max_bitrate_bps(max_bitrate_bps),
+          enforce_min_bitrate(enforce_min_bitrate),
+          track_id(track_id) {}
+    TrackConfig(const TrackConfig& track_config) = default;
+    virtual ~TrackConfig() = default;
+    TrackConfig() {}
+
+    // Minimum bitrate supported by track.
+    uint32_t min_bitrate_bps;
+
+    // Maximum bitrate supported by track.
+    uint32_t max_bitrate_bps;
+
+    // True means track may not be paused by allocating 0 bitrate.
+    bool enforce_min_bitrate;
+
+    // MediaStreamTrack ID as defined by application. May be empty.
+    std::string track_id;
+  };
+
+  static std::vector<uint32_t> SetAllBitratesToMinimum(
+      const ArrayView<const TrackConfig*> track_configs);
+  static std::vector<uint32_t> DistributeBitratesEvenly(
+      const ArrayView<const TrackConfig*> track_configs,
+      uint32_t available_bitrate);
+
+  // Strategy is expected to allocate all available_bitrate up to the sum of
+  // max_bitrate_bps of all tracks. If available_bitrate is less than the sum of
+  // min_bitrate_bps of all tracks, tracks having enforce_min_bitrate set to
+  // false may get 0 allocation and are suppoused to pause, tracks with
+  // enforce_min_bitrate set to true are expecting to get min_bitrate_bps.
+  //
+  // If the strategy will allocate more than available_bitrate it may cause
+  // overuse of the currently available network capacity and may cause increase
+  // in RTT and packet loss. Allocating less than available bitrate may cause
+  // available_bitrate decrease.
+  virtual std::vector<uint32_t> AllocateBitrates(
+      uint32_t available_bitrate,
+      const ArrayView<const TrackConfig*> track_configs) = 0;
+
+  virtual ~BitrateAllocationStrategy() = default;
+};
+
+// Simple allocation strategy giving priority to audio until
+// sufficient_audio_bitrate is reached. Bitrate is distributed evenly between
+// the tracks after sufficient_audio_bitrate is reached. This implementation
+// does not pause tracks even if enforce_min_bitrate is false.
+class AudioPriorityBitrateAllocationStrategy
+    : public BitrateAllocationStrategy {
+ public:
+  AudioPriorityBitrateAllocationStrategy(std::string audio_track_id,
+                                         uint32_t sufficient_audio_bitrate);
+  std::vector<uint32_t> AllocateBitrates(
+      uint32_t available_bitrate,
+      const ArrayView<const TrackConfig*> track_configs) override;
+
+ private:
+  std::string audio_track_id_;
+  uint32_t sufficient_audio_bitrate_;
+};
+}  // namespace rtc
+
+#endif  // RTC_BASE_BITRATEALLOCATIONSTRATEGY_H_