content: pepper: VideoEncoder: add software encoder support

content/renderer/pepper/video_encoder_shim.h

+// Copyright 2015 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_PEPPER_VIDEO_ENCODER_SHIM_H_
+#define CONTENT_RENDERER_PEPPER_VIDEO_ENCODER_SHIM_H_
+
+#include <vector>
+
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
+#include "media/video/video_encode_accelerator.h"
+
+namespace base {
+class SingleThreadTaskRunner;
+}
+
+namespace gfx {
+class Size;
+}
+
+namespace content {
+
+class PepperVideoEncoderHost;
+
+// This class is a shim to wrap a media::cast::SoftwareVideoEncoder so that it
+// can be used by PepperVideoEncoderHost in place of a
+// media::VideoEncodeAccelerator. This class should be constructed, used, and
+// destructed on the main (render) thread.
+class VideoEncoderShim : public media::VideoEncodeAccelerator {
+ public:
+  explicit VideoEncoderShim(PepperVideoEncoderHost* host);
+  ~VideoEncoderShim() override;
+
+  // media::VideoEncodeAccelerator implementation.
+  std::vector<media::VideoEncodeAccelerator::SupportedProfile>
+  GetSupportedProfiles() override;
+  bool Initialize(media::VideoFrame::Format input_format,
+                  const gfx::Size& input_visible_size,
+                  media::VideoCodecProfile output_profile,
+                  uint32 initial_bitrate,
+                  media::VideoEncodeAccelerator::Client* client) override;
+  void Encode(const scoped_refptr<media::VideoFrame>& frame,
+              bool force_keyframe) override;
+  void UseOutputBitstreamBuffer(const media::BitstreamBuffer& buffer) override;
+  void RequestEncodingParametersChange(uint32 bitrate,
+                                       uint32 framerate) override;
+  void Destroy() override;
+
+ private:
+  class EncoderImpl;
+
+  void OnRequireBitstreamBuffers(unsigned int input_count,
+                                 const gfx::Size& input_coded_size,
+                                 size_t output_buffer_size);
+  void OnBitstreamBufferReady(scoped_refptr<media::VideoFrame> frame,
+                              int32 bitstream_buffer_id,
+                              size_t payload_size,
+                              bool key_frame);
+  void OnNotifyError(media::VideoEncodeAccelerator::Error error);
+
+  scoped_ptr<EncoderImpl> encoder_impl_;
+
+  PepperVideoEncoderHost* host_;
+
+  // Task doing the encoding.
+  scoped_refptr<base::SingleThreadTaskRunner> media_task_runner_;
+
+  base::WeakPtrFactory<VideoEncoderShim> weak_ptr_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(VideoEncoderShim);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_PEPPER_VIDEO_ENCODER_SHIM_H_