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

webrtc/modules/video_coding/codecs/vp8/temporal_layers.h

 /* Copyright (c) 2011 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.
 */
 /*
 * This file defines the interface for doing temporal layers with VP8.
 */
 #ifndef WEBRTC_MODULES_VIDEO_CODING_CODECS_VP8_TEMPORAL_LAYERS_H_
 #define WEBRTC_MODULES_VIDEO_CODING_CODECS_VP8_TEMPORAL_LAYERS_H_
 
-#include "vpx/vpx_encoder.h"
+#include <vector>
 
 #include "webrtc/common_video/include/video_image.h"
 #include "webrtc/typedefs.h"
 
+struct vpx_codec_enc_cfg;
+typedef struct vpx_codec_enc_cfg vpx_codec_enc_cfg_t;
+
 namespace webrtc {
 
 struct CodecSpecificInfoVP8;
 
 class TemporalLayers {
  public:
-  // Factory for TemporalLayer strategy. Default behaviour is a fixed pattern
+  // Factory for TemporalLayer strategy. Default behavior is a fixed pattern
   // of temporal layers. See default_temporal_layers.cc
   virtual ~TemporalLayers() {}
 
   // Returns the recommended VP8 encode flags needed. May refresh the decoder
   // and/or update the reference buffers.
   virtual int EncodeFlags(uint32_t timestamp) = 0;
 
-  virtual bool ConfigureBitrates(int bitrate_kbit,
-                                 int max_bitrate_kbit,
-                                 int framerate,
-                                 vpx_codec_enc_cfg_t* cfg) = 0;
+  // Update state based on new bitrate target and incoming framerate.
+  // Returns the bitrate allocation for the active temporal layers.
+  virtual std::vector<uint32_t> OnRatesUpdated(int bitrate_kbit,
+                                               int max_bitrate_kbit,
+                                               int framerate) = 0;
+
+  // Update the encoder configuration with target bitrates or other parameters.
+  // Returns true iff the configuration was actually modified.
+  virtual bool UpdateConfiguration(vpx_codec_enc_cfg_t* cfg) = 0;
 
   virtual void PopulateCodecSpecific(bool base_layer_sync,
                                      CodecSpecificInfoVP8* vp8_info,
                                      uint32_t timestamp) = 0;
 
   virtual void FrameEncoded(unsigned int size, uint32_t timestamp, int qp) = 0;
 
   virtual int CurrentLayerId() const = 0;
-
-  virtual bool UpdateConfiguration(vpx_codec_enc_cfg_t* cfg) = 0;
 };
 
+class TemporalLayersListener;
 class TemporalLayersFactory {
  public:
+  TemporalLayersFactory() : listener_(nullptr) {}
   virtual ~TemporalLayersFactory() {}
-  virtual TemporalLayers* Create(int temporal_layers,
+  virtual TemporalLayers* Create(int simulcast_id,
+                                 int temporal_layers,
                                  uint8_t initial_tl0_pic_idx) const;
+  void SetListener(TemporalLayersListener* listener);
+
+ protected:
+  TemporalLayersListener* listener_;
 };
 
 // Factory for a temporal layers strategy that adaptively changes the number of
-// layers based on input framerate so that the base layer has an acceptable
-// framerate. See realtime_temporal_layers.cc
+// layers based on input frame rate so that the base layer has an acceptable
+// frame rate. See realtime_temporal_layers.cc
 class RealTimeTemporalLayersFactory : public TemporalLayersFactory {
  public:
+  RealTimeTemporalLayersFactory() {}
   ~RealTimeTemporalLayersFactory() override {}
-  TemporalLayers* Create(int num_temporal_layers,
+  TemporalLayers* Create(int simulcast_id,
+                         int num_temporal_layers,
                          uint8_t initial_tl0_pic_idx) const override;
 };
 
+class TemporalLayersListener {
+ public:
+  TemporalLayersListener() {}
+  virtual ~TemporalLayersListener() {}
+
+  virtual void OnTemporalLayersCreated(int simulcast_id,
+                                       TemporalLayers* layers) = 0;
+};
+
 }  // namespace webrtc
 #endif  // WEBRTC_MODULES_VIDEO_CODING_CODECS_VP8_TEMPORAL_LAYERS_H_