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

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

Index: webrtc/modules/video_coding/codecs/vp8/default_temporal_layers.h
diff --git a/webrtc/modules/video_coding/codecs/vp8/default_temporal_layers.h b/webrtc/modules/video_coding/codecs/vp8/default_temporal_layers.h
index 19846ba5ff2b7660c8681bfe42b9123248ac10df..280edda4efe57ab75d049df1bd23d3c6cdfad097 100644
--- a/webrtc/modules/video_coding/codecs/vp8/default_temporal_layers.h
+++ b/webrtc/modules/video_coding/codecs/vp8/default_temporal_layers.h
@@ -12,8 +12,12 @@
 #ifndef WEBRTC_MODULES_VIDEO_CODING_CODECS_VP8_DEFAULT_TEMPORAL_LAYERS_H_
 #define WEBRTC_MODULES_VIDEO_CODING_CODECS_VP8_DEFAULT_TEMPORAL_LAYERS_H_
 
+#include <vector>
+
 #include "webrtc/modules/video_coding/codecs/vp8/temporal_layers.h"
 
+#include "webrtc/base/optional.h"
+
 namespace webrtc {
 
 class DefaultTemporalLayers : public TemporalLayers {
@@ -26,10 +30,13 @@ class DefaultTemporalLayers : public TemporalLayers {
   // and/or update the reference buffers.
   int EncodeFlags(uint32_t timestamp) override;
 
-  bool ConfigureBitrates(int bitrate_kbit,
-                         int max_bitrate_kbit,
-                         int framerate,
-                         vpx_codec_enc_cfg_t* cfg) override;
+  // Update state based on new bitrate target and incoming framerate.
+  // Returns the bitrate allocation for the active temporal layers.
+  std::vector<uint32_t> OnRatesUpdated(int bitrate_kbit,
+                                       int max_bitrate_kbit,
+                                       int framerate) override;
+
+  bool UpdateConfiguration(vpx_codec_enc_cfg_t* cfg) override;
 
   void PopulateCodecSpecific(bool base_layer_sync,
                              CodecSpecificInfoVP8* vp8_info,
@@ -37,8 +44,6 @@ class DefaultTemporalLayers : public TemporalLayers {
 
   void FrameEncoded(unsigned int size, uint32_t timestamp, int qp) override {}
 
-  bool UpdateConfiguration(vpx_codec_enc_cfg_t* cfg) override { return false; }
-
   int CurrentLayerId() const override;
 
  private:
@@ -77,7 +82,7 @@ class DefaultTemporalLayers : public TemporalLayers {
   };
   enum { kMaxTemporalPattern = 16 };
 
-  int number_of_temporal_layers_;
+  const int number_of_temporal_layers_;
   int temporal_ids_length_;
   int temporal_ids_[kMaxTemporalPattern];
   int temporal_pattern_length_;
@@ -86,6 +91,7 @@ class DefaultTemporalLayers : public TemporalLayers {
   uint8_t pattern_idx_;
   uint32_t timestamp_;
   bool last_base_layer_sync_;
+  rtc::Optional<std::vector<uint32_t>> new_bitrates_kbps_;
 };
 
 }  // namespace webrtc