Extract bitrate allocation of spatial/temporal layers out of codec impl.

webrtc/modules/video_coding/utility/simulcast_rate_allocator.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_UTILITY_SIMULCAST_RATE_ALLOCATOR_H_
 #define WEBRTC_MODULES_VIDEO_CODING_UTILITY_SIMULCAST_RATE_ALLOCATOR_H_
 
-#include <vector>
+#include <map>
+#include <memory>
 
 #include "webrtc/base/basictypes.h"
 #include "webrtc/base/constructormagic.h"
+#include "webrtc/common_video/include/video_bitrate_allocator.h"
+#include "webrtc/modules/video_coding/codecs/vp8/temporal_layers.h"
 #include "webrtc/video_encoder.h"
 
 namespace webrtc {
 
-class SimulcastRateAllocator {
+class SimulcastRateAllocator : public VideoBitrateAllocator,
+                               public TemporalLayersListener {
  public:
-  explicit SimulcastRateAllocator(const VideoCodec& codec);
+  explicit SimulcastRateAllocator(
+      const VideoCodec& codec,
+      std::unique_ptr<TemporalLayersFactory> tl_factory);
 
-  std::vector<uint32_t> GetAllocation(uint32_t bitrate_kbps) const;
-  uint32_t GetPreferedBitrate() const;
+  void OnTemporalLayersCreated(int simulcast_id,
+                               TemporalLayers* layers) override;
+
+  BitrateAllocation GetAllocation(uint32_t total_bitrate_bps,
+                                  uint32_t framerate) override;
+  uint32_t GetPreferedBitrate(int frame_rate) override;
   const VideoCodec& GetCodec() const;
 
  private:
   const VideoCodec codec_;
+  std::map<uint32_t, TemporalLayers*> temporal_layers_;
+  std::unique_ptr<TemporalLayersFactory> tl_factory_;
 
   RTC_DISALLOW_COPY_AND_ASSIGN(SimulcastRateAllocator);
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_VIDEO_CODING_UTILITY_SIMULCAST_RATE_ALLOCATOR_H_