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

webrtc/video_encoder.h

 /*
  *  Copyright (c) 2014 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_VIDEO_ENCODER_H_
 #define WEBRTC_VIDEO_ENCODER_H_
 
 #include <memory>
 #include <string>
 #include <vector>
 
+#include "webrtc/base/checks.h"
 #include "webrtc/common_types.h"
 #include "webrtc/typedefs.h"
 #include "webrtc/video_frame.h"
 
 namespace webrtc {
 
 class RTPFragmentationHeader;
 // TODO(pbos): Expose these through a public (root) header or change these APIs.
 struct CodecSpecificInfo;
 class VideoCodec;
@@ skipping 113 matching lines @@
   //                          <0 - Errors: WEBRTC_VIDEO_CODEC_ERROR
   virtual int32_t SetChannelParameters(uint32_t packet_loss, int64_t rtt) = 0;
 
   // Inform the encoder about the new target bit rate.
   //
   // Input:
   //          - bitrate         : New target bit rate
   //          - framerate       : The target frame rate
   //
   // Return value                : WEBRTC_VIDEO_CODEC_OK if OK, < 0 otherwise.
-  virtual int32_t SetRates(uint32_t bitrate, uint32_t framerate) = 0;
+  virtual int32_t SetRates(uint32_t bitrate, uint32_t framerate) {
+    RTC_NOTREACHED() << "SetRate(uint32_t, uint32_t) is deprecated.";
+    return -1;
+  }
+
+  // Default fallback: Just use the sum of bitrates as the single target rate.
+  // TODO(sprang): Remove this default implementation when we remove SetRates().
+  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; }
   virtual const char* ImplementationName() const { return "unknown"; }
 };
 
 // Class used to wrap external VideoEncoders to provide a fallback option on
 // software encoding when a hardware encoder fails to encode a stream due to
 // hardware restrictions, such as max resolution.
 class VideoEncoderSoftwareFallbackWrapper : public VideoEncoder {
  public:
   VideoEncoderSoftwareFallbackWrapper(VideoCodecType codec_type,
                                       webrtc::VideoEncoder* encoder);
 
   int32_t InitEncode(const VideoCodec* codec_settings,
                      int32_t number_of_cores,
                      size_t max_payload_size) override;
 
   int32_t RegisterEncodeCompleteCallback(
       EncodedImageCallback* callback) override;
 
   int32_t Release() override;
   int32_t Encode(const VideoFrame& frame,
                  const CodecSpecificInfo* codec_specific_info,
                  const std::vector<FrameType>* frame_types) override;
   int32_t SetChannelParameters(uint32_t packet_loss, int64_t rtt) override;
-
-  int32_t SetRates(uint32_t bitrate, uint32_t framerate) override;
+  int32_t SetRateAllocation(const BitrateAllocation& bitrate_allocation,
+                            uint32_t framerate) override;
   void OnDroppedFrame() override;
   bool SupportsNativeHandle() const override;
 
  private:
   bool InitFallbackEncoder();
 
   // Settings used in the last InitEncode call and used if a dynamic fallback to
   // software is required.
   VideoCodec codec_settings_;
   int32_t number_of_cores_;
   size_t max_payload_size_;
 
   // The last bitrate/framerate set, and a flag for noting they are set.
   bool rates_set_;
-  uint32_t bitrate_;
+  BitrateAllocation bitrate_allocation_;
   uint32_t framerate_;
 
   // The last channel parameters set, and a flag for noting they are set.
   bool channel_parameters_set_;
   uint32_t packet_loss_;
   int64_t rtt_;
 
   const EncoderType encoder_type_;
   webrtc::VideoEncoder* const encoder_;
 
   std::unique_ptr<webrtc::VideoEncoder> fallback_encoder_;
   std::string fallback_implementation_name_;
   EncodedImageCallback* callback_;
 };
 }  // namespace webrtc
 #endif  // WEBRTC_VIDEO_ENCODER_H_