Bitrate controller for VideoToolbox Video Encode Accelerator

content/common/gpu/media/vt_video_encode_accelerator_mac.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_COMMON_GPU_MEDIA_VT_VIDEO_ENCODE_ACCELERATOR_MAC_H_
 #define CONTENT_COMMON_GPU_MEDIA_VT_VIDEO_ENCODE_ACCELERATOR_MAC_H_
 
 #include <memory>
 
 #include "base/mac/scoped_cftyperef.h"
 #include "content/common/content_export.h"
 #include "media/base/mac/videotoolbox_glue.h"
 #include "media/base/mac/videotoolbox_helpers.h"
 #include "media/video/video_encode_accelerator.h"
+#include "third_party/webrtc/common_video/include/bitrate_adjuster.h"
 
 namespace content {
 
 // VideoToolbox.framework implementation of the VideoEncodeAccelerator
 // interface for MacOSX. VideoToolbox makes no guarantees that it is thread
 // safe, so this object is pinned to the thread on which it is constructed.
 class CONTENT_EXPORT VTVideoEncodeAccelerator
     : public media::VideoEncodeAccelerator {
  public:
   VTVideoEncodeAccelerator();
@@ skipping 75 matching lines @@
   void DestroyCompressionSession();
 
   // VideoToolboxGlue provides access to VideoToolbox at runtime.
   const VideoToolboxGlue* videotoolbox_glue_;
   base::ScopedCFTypeRef<VTCompressionSessionRef> compression_session_;
 
   gfx::Size input_visible_size_;
   size_t bitstream_buffer_size_;
   int32_t frame_rate_;
   int32_t target_bitrate_;
+  int32_t adjusted_bitrate_;
+
+  // Bitrate adjuster used to fix VideoToolbox's inconsistent bitrate issues.
+  webrtc::BitrateAdjuster bitrate_adjuster_;
 
   // Bitstream buffers ready to be used to return encoded output as a FIFO.
   std::deque<std::unique_ptr<BitstreamBufferRef>> bitstream_buffer_queue_;
 
   // EncodeOutput needs to be copied into a BitstreamBufferRef as a FIFO.
   std::deque<std::unique_ptr<EncodeOutput>> encoder_output_queue_;
 
   // Our original calling task runner for the child thread.
   const scoped_refptr<base::SingleThreadTaskRunner> client_task_runner_;
 
@@ skipping 16 matching lines @@
   // other destructors run.
   base::WeakPtr<VTVideoEncodeAccelerator> encoder_weak_ptr_;
   base::WeakPtrFactory<VTVideoEncodeAccelerator> encoder_task_weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(VTVideoEncodeAccelerator);
 };
 
 } // namespace content
 
 #endif  // CONTENT_COMMON_GPU_MEDIA_VT_VIDEO_ENCODE_ACCELERATOR_MAC_H_