Revert "Enable H.264 hardware MFT encoder on Windows"

This reverts commit 2f702ab1.

Reason for revert: https://crbug.com/1058627 https://crbug.com/1058583

Original change's description:
> Enable H.264 hardware MFT encoder on Windows
> 
> Currently Microsoft H.264 encoder MFT is always used as WebRTC external
> encoder without hardware acceleration. This change enables H.264
> hardware MFT encoder on Windows.
> 
> Bug: 982799
> Change-Id: Ia33812508034daa99dd3dc1fb64b83cb1d7c8465
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1777521
> Commit-Queue: Dale Curtis <dalecurtis@chromium.org>
> Reviewed-by: Tommi <tommi@chromium.org>
> Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#745539}

TBR=tommi@chromium.org,dalecurtis@chromium.org,sprang@chromium.org,chunbo.hua@intel.com

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 982799
Change-Id: Iab66c1936f27901889e371901642b72f80eff733
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2088733Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#747051}

AUTHORS

@@ -187,7 +187,6 @@ Chris Tserng <tserng@amazon.com>
 Chris Vasselli <clindsay@gmail.com>
 Christophe Dumez <ch.dumez@samsung.com>
 Christopher Dale <chrelad@gmail.com>
-Chunbo Hua <chunbo.hua@intel.com>
 Claudio DeSouza <claudiomdsjr@gmail.com>
 Clemens Fruhwirth <clemens@endorphin.org>
 Clement Scheelfeldt Skau <clementskau@gmail.com>

media/gpu/windows/media_foundation_video_encode_accelerator_win.h

@@ -65,8 +65,8 @@ class MEDIA_GPU_EXPORT MediaFoundationVideoEncodeAccelerator
   // Creates an hardware encoder backed IMFTransform instance on |encoder_|.
   bool CreateHardwareEncoderMFT();
 
-  // Initializes and allocates memory for input and output parameters.
-  bool InitializeInputOutputParameters(VideoCodecProfile output_profile);
+  // Initializes and allocates memory for input and output samples.
+  bool InitializeInputOutputSamples(VideoCodecProfile output_profile);
 
   // Initializes encoder parameters for real-time use.
   bool SetEncoderModes();
@@ -82,23 +82,20 @@ class MEDIA_GPU_EXPORT MediaFoundationVideoEncodeAccelerator
   // Encoding tasks to be run on |encoder_thread_|.
   void EncodeTask(scoped_refptr<VideoFrame> frame, bool force_keyframe);
 
-  // Processes the input video frame for the encoder.
-  void ProcessInput(scoped_refptr<VideoFrame> frame, bool force_keyframe);
-
   // Checks for and copies encoded output on |encoder_thread_|.
   void ProcessOutput();
 
-  // Tries to deliver the input frame to the encoder.
-  bool TryToDeliverInputFrame(scoped_refptr<VideoFrame> frame,
-                              bool force_keyframe);
-
-  // Tries to return a bitstream buffer to the client.
-  void TryToReturnBitstreamBuffer();
-
   // Inserts the output buffers for reuse on |encoder_thread_|.
   void UseOutputBitstreamBufferTask(
       std::unique_ptr<BitstreamBufferRef> buffer_ref);
 
+  // Copies EncodeOutput into a BitstreamBuffer and returns it to the
+  // |main_client_|.
+  void ReturnBitstreamBuffer(
+      std::unique_ptr<EncodeOutput> encode_output,
+      std::unique_ptr<MediaFoundationVideoEncodeAccelerator::BitstreamBufferRef>
+          buffer_ref);
+
   // Changes encode parameters on |encoder_thread_|.
   void RequestEncodingParametersChangeTask(uint32_t bitrate,
                                            uint32_t framerate);
@@ -122,11 +119,14 @@ class MEDIA_GPU_EXPORT MediaFoundationVideoEncodeAccelerator
   size_t bitstream_buffer_size_;
   uint32_t frame_rate_;
   uint32_t target_bitrate_;
+  size_t u_plane_offset_;
+  size_t v_plane_offset_;
+  size_t y_stride_;
+  size_t u_stride_;
+  size_t v_stride_;
 
-  Microsoft::WRL::ComPtr<IMFActivate> activate_;
   Microsoft::WRL::ComPtr<IMFTransform> encoder_;
   Microsoft::WRL::ComPtr<ICodecAPI> codec_api_;
-  Microsoft::WRL::ComPtr<IMFMediaEventGenerator> event_generator_;
 
   DWORD input_stream_id_;
   DWORD output_stream_id_;
@@ -134,8 +134,8 @@ class MEDIA_GPU_EXPORT MediaFoundationVideoEncodeAccelerator
   Microsoft::WRL::ComPtr<IMFMediaType> imf_input_media_type_;
   Microsoft::WRL::ComPtr<IMFMediaType> imf_output_media_type_;
 
-  bool input_required_;
   Microsoft::WRL::ComPtr<IMFSample> input_sample_;
+  Microsoft::WRL::ComPtr<IMFSample> output_sample_;
 
   // MediaFoundation session.
   MFSessionLifetime session_;
@@ -155,7 +155,7 @@ class MEDIA_GPU_EXPORT MediaFoundationVideoEncodeAccelerator
   // Declared last to ensure that all weak pointers are invalidated before
   // other destructors run.
   base::WeakPtrFactory<MediaFoundationVideoEncodeAccelerator>
-      encoder_task_weak_factory_;
+      encoder_task_weak_factory_{this};
 
   DISALLOW_COPY_AND_ASSIGN(MediaFoundationVideoEncodeAccelerator);
 };