Allow encoders to fall back dynamically to software.

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.
  */
 
@@ skipping 138 matching lines @@
                  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;
   void OnDroppedFrame() override;
   int GetTargetFramerate() 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_;
+  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_;
 
   rtc::scoped_ptr<webrtc::VideoEncoder> fallback_encoder_;
   EncodedImageCallback* callback_;
 };
 }  // namespace webrtc
 #endif  // WEBRTC_VIDEO_ENCODER_H_