Adding basic implementation of AudioNetworkAdaptor.

webrtc/modules/audio_coding/audio_network_adaptor/controller.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_AUDIO_CODING_AUDIO_NETWORK_ADAPTOR_CONTROLLER_H_
+#define WEBRTC_MODULES_AUDIO_CODING_AUDIO_NETWORK_ADAPTOR_CONTROLLER_H_
+
+#include "webrtc/base/optional.h"
+#include "webrtc/modules/audio_coding/audio_network_adaptor/include/audio_network_adaptor.h"
+
+namespace webrtc {
+
+class Controller {
+ public:
+  struct NetworkMetrics {
+    NetworkMetrics();
+    ~NetworkMetrics();
+    rtc::Optional<int> uplink_bandwidth_bps;
+    rtc::Optional<float> uplink_packet_loss_fraction;
+  };
+
+  struct Constraints {
+    Constraints();
+    ~Constraints();
+    struct FrameLengthRange {
+      FrameLengthRange(int min_frame_length_ms, int max_frame_length_ms);
+      ~FrameLengthRange();
+      int min_frame_length_ms;
+      int max_frame_length_ms;
+    };
+    rtc::Optional<FrameLengthRange> receiver_frame_length_range;
+  };
+
+  virtual ~Controller() = default;
+
+  virtual void MakeDecision(
+      const NetworkMetrics& metrics,
+      AudioNetworkAdaptor::EncoderRuntimeConfig* config) = 0;
+
+  virtual void SetConstraints(const Constraints& constraints);
+};
+
+}  // namespace webrtc
+
+#endif  // WEBRTC_MODULES_AUDIO_CODING_AUDIO_NETWORK_ADAPTOR_CONTROLLER_H_