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

webrtc/video_encoder.h

Index: webrtc/video_encoder.h
diff --git a/webrtc/video_encoder.h b/webrtc/video_encoder.h
index d28533b9fd062f23c12cf1ff10f984b501f90259..0526d1a241a96f1a3c232f0b6e1ecb7caf01acb1 100644
--- a/webrtc/video_encoder.h
+++ b/webrtc/video_encoder.h
@@ -163,6 +163,12 @@ class VideoEncoder {
   // Return value                : WEBRTC_VIDEO_CODEC_OK if OK, < 0 otherwise.
   virtual int32_t SetRates(uint32_t bitrate, uint32_t framerate) = 0;

[perkj_webrtc, 2016/10/21 08:24:29]

Deprecate SetRates and add a default implementation that DCHECK since we no
longer call it.

[sprang_webrtc, 2016/10/25 10:44:25]

Done.

 
+  // Default fallback: Just use the sum of bitrates as the single target rate.
+  virtual int32_t SetRateAllocation(const BitrateAllocation& allocation,
+                                    uint32_t framerate) {
+    return SetRates(allocation.get_sum_kbps(), framerate);
+  }
+
   virtual int32_t SetPeriodicKeyFrames(bool enable) { return -1; }
   virtual void OnDroppedFrame() {}
   virtual bool SupportsNativeHandle() const { return false; }