Refactor VideoTrackRecorder into smaller classes

content/renderer/media_recorder/vea_encoder.h

+// Copyright 2017 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_RENDERER_MEDIA_RECORDER_VEA_ENCODER_H_
+#define CONTENT_RENDERER_MEDIA_RECORDER_VEA_ENCODER_H_
+
+#include <queue>
+
+#include "content/renderer/media_recorder/video_track_recorder.h"
+#include "media/video/video_encode_accelerator.h"
+#include "ui/gfx/geometry/size.h"
+
+namespace base {
+class WaitableEvent;
+}  // namespace base
+
+namespace media {
+class GpuVideoAcceleratorFactories;
+}  // namespace media
+
+namespace content {
+
+// Class encapsulating VideoEncodeAccelerator interactions.
+// This class is created and destroyed on its owner thread. All other methods
+// operate on the task runner pointed by GpuFactories.
+class VEAEncoder final : public VideoTrackRecorder::Encoder,
+                         public media::VideoEncodeAccelerator::Client {
+ public:
+  VEAEncoder(
+      const VideoTrackRecorder::OnEncodedVideoCB& on_encoded_video_callback,
+      const VideoTrackRecorder::OnErrorCB& on_error_callback,
+      int32_t bits_per_second,
+      media::VideoCodecProfile codec,
+      const gfx::Size& size);
+
+  // media::VideoEncodeAccelerator::Client implementation.
+  void RequireBitstreamBuffers(unsigned int input_count,
+                               const gfx::Size& input_coded_size,
+                               size_t output_buffer_size) override;
+  void BitstreamBufferReady(int32_t bitstream_buffer_id,
+                            size_t payload_size,
+                            bool key_frame,
+                            base::TimeDelta timestamp) override;
+  void NotifyError(media::VideoEncodeAccelerator::Error error) override;
+
+ private:
+  using VideoFrameAndTimestamp =
+      std::pair<scoped_refptr<media::VideoFrame>, base::TimeTicks>;
+  using VideoParamsAndTimestamp =
+      std::pair<media::WebmMuxer::VideoParameters, base::TimeTicks>;
+
+  void UseOutputBitstreamBufferId(int32_t bitstream_buffer_id);
+  void FrameFinished(std::unique_ptr<base::SharedMemory> shm);
+
+  // VideoTrackRecorder::Encoder implementation.
+  ~VEAEncoder() override;
+  void EncodeOnEncodingTaskRunner(scoped_refptr<media::VideoFrame> frame,
+                                  base::TimeTicks capture_timestamp) override;
+
+  void ConfigureEncoderOnEncodingTaskRunner(const gfx::Size& size);
+
+  void DestroyOnEncodingTaskRunner(base::WaitableEvent* async_waiter);
+
+  media::GpuVideoAcceleratorFactories* const gpu_factories_;
+
+  const media::VideoCodecProfile codec_;
+
+  // The underlying VEA to perform encoding on.
+  std::unique_ptr<media::VideoEncodeAccelerator> video_encoder_;
+
+  // Shared memory buffers for output with the VEA.
+  std::vector<std::unique_ptr<base::SharedMemory>> output_buffers_;
+
+  // Shared memory buffers for output with the VEA as FIFO.
+  std::queue<std::unique_ptr<base::SharedMemory>> input_buffers_;
+
+  // Tracks error status.
+  bool error_notified_;
+
+  // Tracks the last frame that we delay the encode.
+  std::unique_ptr<VideoFrameAndTimestamp> last_frame_;
+
+  // Size used to initialize encoder.
+  gfx::Size input_visible_size_;
+
+  // Coded size that encoder requests as input.
+  gfx::Size vea_requested_input_coded_size_;
+
+  // Frames and corresponding timestamps in encode as FIFO.
+  std::queue<VideoParamsAndTimestamp> frames_in_encode_;
+
+  // This callback can be exercised on any thread.
+  const VideoTrackRecorder::OnErrorCB on_error_callback_;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_MEDIA_RECORDER_VEA_ENCODER_H_