Add ArcGpuVideoDecodeAccelerator.

content/common/gpu/media/arc/arc_gpu_video_decode_accelerator.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_ARC_ARC_VIDEO_ACCELERATOR_ADAPTER_H_
+#define CONTENT_COMMON_GPU_MEDIA_ARC_ARC_VIDEO_ACCELERATOR_ADAPTER_H_
+
+#include <queue>
+#include <vector>
+
+#include "base/callback.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/threading/thread_checker.h"
+#include "content/common/gpu/media/arc/arc_video_accelerator.h"
+#include "media/video/video_decode_accelerator.h"
+
+namespace content {
+namespace arc {
+
+// This class is excuted in Chromium's GPU process. It takes decoding requests
+// from ARC container via IPC channels and translates and send those requests
+// to the real VDA on Chromium. It also returns the decoded frames back to the
+// ARC side.
+class ArcGpuVideoDecodeAccelerator
+    : public ArcVideoAccelerator,
+      public media::VideoDecodeAccelerator::Client {
+ public:
+  ArcGpuVideoDecodeAccelerator();
+
+  // Implementation of the ArcVideoAccelerator interface.
+  bool Initialize(DeviceType device,
+                  ArcVideoAccelerator::Client* client) override;
+  bool SetBufferCount(PortType port, size_t* count) override;
+  bool SetBufferFormat(PortType port, const BufferFormat& format) override;
+  bool BindSharedMemory(PortType port,
+                        uint32_t index,
+                        int ashmem_fd,
+                        size_t offset,
+                        size_t length) override;
+  bool BindDmabuf(PortType port, uint32_t index, int dmabuf_fd) override;
+  void UseBuffer(PortType port,
+                 uint32_t index,
+                 const BufferMetadata& metadata) override;
+  void Reset() override;
+
+  // Implementation of the VideoDecodeAccelerator::Client interface.
+  void ProvidePictureBuffers(uint32_t requested_num_of_buffers,
+                             const gfx::Size& dimensions,
+                             uint32_t texture_target) override;
+  void DismissPictureBuffer(int32_t picture_buffer) override;
+  void PictureReady(const media::Picture& picture) override;
+  void NotifyEndOfBitstreamBuffer(int32_t bitstream_buffer_id) override;
+  void NotifyFlushDone() override;
+  void NotifyResetDone() override;
+  void NotifyError(media::VideoDecodeAccelerator::Error error) override;
+
+ private:
+  struct InputRecord {
+    // The file handle to access the buffer. It is owned by this ArcGVDA and
+    // should be freed if not used.
+    base::ScopedFD handle;
+    off_t offset;
+    size_t length;
+    int32_t bitstream_buffer_id;
+    int64_t timestamp;
+
+    InputRecord();
+  };
+
+  struct PortInfo {
+    MemoryType memory_type;
+    size_t num_buffers;
+
+    PortInfo();
+  };
+
+  // Helper function to Send the end-of-stream output buffer if
+  // |pending_eos_output_buffer_| is true, or reuse the picture in ArcVDA.
+  void SendEosIfNeededOrReusePicture(uint32_t index);
+
+  // Helper functions to validate |port| (and |index|).
+  bool ValidatePort(PortType port);
+  bool ValidatePortAndIndex(PortType port, uint32_t index);
+
+  // Indicates a pending EOS output buffer. When it is true, an EOS output
+  // buffer need to be sent to |arc_client_| once an output buffer is available.
+  bool pending_eos_output_buffer_;
+  scoped_ptr<media::VideoDecodeAccelerator> vda_;
+
+  // Help functions to find the index of the InputRecord which matches to given
+  // |bitstream_buffer_id|. Returns the size of |input_records_| if it cannot be
+  // found.
+  uint32_t FindInputRecordByBitstreamBufferId(int32_t bitstream_buffer_id);

[kcwu, 2016/01/20 09:11:05]

move this to line 85.
To keep methods in front of variables.

[Owen Lin, 2016/02/02 09:08:06]

Done.

+
+  // It's safe to use the pointer here, the life cycle of the |arc_client_|
+  // is longer than this ArcGpuVideoDecodeAccelerator.
+  ArcVideoAccelerator::Client* arc_client_;
+
+  // The callback called when reset completes.
+  base::Closure reset_done_callback_;
+
+  PortInfo port_info_[PORT_COUNT];
+
+  // The next bitstream_buffer_id, started from 0.
+  int32_t next_bitstream_buffer_id_;
+
+  gfx::Size coded_size_;
+
+  // The index of buffers returned while Flushing, will be used for sending
+  // EOS buffer back to |arc_client_|.
+  std::queue<uint32_t> buffers_pending_eos_;
+
+  std::vector<InputRecord> input_records_;
+
+  base::ThreadChecker thread_checker_;
+};
+
+}  // namespace arc
+}  // namespace content
+
+#endif  // CONTENT_COMMON_GPU_MEDIA_ARC_ARC_VIDEO_ACCELERATOR_ADAPTER_H_