media: gpu process ipc video decoder implementation

chrome/renderer/gpu_video_decoder_host.h

+// Copyright (c) 2010 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 CHROME_RENDERER_GPU_VIDEO_DECODER_HOST_H_
+#define CHROME_RENDERER_GPU_VIDEO_DECODER_HOST_H_
+
+#include <deque>
+
+#include "base/singleton.h"
+#include "chrome/common/gpu_video_common.h"
+#include "chrome/renderer/gpu_channel_host.h"
+#include "ipc/ipc_channel_proxy.h"
+#include "media/base/buffers.h"
+#include "media/base/video_frame.h"
+
+using media::VideoFrame;
+using media::Buffer;
+
+class GpuVideoServiceHost;
+
+class GpuVideoDecoderHost
+    : public base::RefCountedThreadSafe<GpuVideoDecoderHost>,
+      public IPC::Channel::Listener {
+ public:
+  class EventHandler {
+   public:
+    virtual void OnInitializeDone(
+        bool success,
+        const GpuVideoDecoderInitDoneParam& param) = 0;
+    virtual void OnUninitializeDone() = 0;
+    virtual void OnFlushDone() = 0;
+    virtual void OnEmptyBufferDone(scoped_refptr<Buffer> buffer) = 0;
+    virtual void OnFillBufferDone(scoped_refptr<VideoFrame> frame) = 0;
+    virtual void OnDeviceError() = 0;
+  };
+
+  typedef enum {
+    kStateUninitialized,
+    kStateNormal,
+    kStateError,
+    kStateFlushing,
+  } GpuVideoDecoderHostState;
+
+  // IPC::Channel::Listener.
+  virtual void OnChannelConnected(int32 peer_pid) {}
+  virtual void OnChannelError();
+  virtual void OnMessageReceived(const IPC::Message& message);
+
+  bool Initialize(const GpuVideoDecoderInitParam& param);
+  bool Uninitialize();
+  void EmptyThisBuffer(scoped_refptr<Buffer> buffer);
+  void FillThisBuffer(scoped_refptr<VideoFrame> frame);
+  bool Flush();
+
+  int32 decoder_id() { return decoder_info_.decoder_id_; }
+  int32 route_id() { return decoder_info_.decoder_route_id_; }
+  int32 my_route_id() { return decoder_info_.decoder_host_route_id_; }
+
+  virtual ~GpuVideoDecoderHost() {}
+
+ private:
+  GpuVideoDecoderHost(GpuVideoServiceHost* service_host,
+                      GpuChannelHost* channel_host,
+                      EventHandler* event_handler,
+                      GpuVideoDecoderInfoParam decoder_info)
+      : gpu_video_service_host_(service_host),
+        channel_host_(channel_host),
+        event_handler_(event_handler),
+        decoder_info_(decoder_info),
+        buffer_id_serial_(0),
+        state_(kStateUninitialized),
+        input_buffer_busy_(false) {}
+  friend class GpuVideoServiceHost;
+
+  // Input message handler.
+  void OnInitializeDone(const GpuVideoDecoderInitDoneParam& param);
+  void OnUninitializeDone();
+  void OnFlushDone();
+  void OnEmptyThisBufferDone();
+  void OnFillThisBufferDone(const GpuVideoDecoderOutputBufferParam& param);
+  void OnEmptyThisBufferACK();
+
+  // Helper function.
+  void SendInputBufferToGpu();
+
+  // We expect that GpuVideoServiceHost's always available during our life span.
+  GpuVideoServiceHost* gpu_video_service_host_;
+
+  scoped_refptr<GpuChannelHost> channel_host_;
+
+  // We expect that the client of us will always available during our life span.
+  EventHandler* event_handler_;
+
+  // Globally identify this decoder in the GPU process.
+  GpuVideoDecoderInfoParam decoder_info_;
+
+  // Input buffer id serial number generator.
+  int32 buffer_id_serial_;
+
+  // Hold information about GpuVideoDecoder configuration.
+  GpuVideoDecoderInitParam init_param_;
+
+  // Hold information about output surface format, etc.
+  GpuVideoDecoderInitDoneParam done_param_;
+
+  // Current state of video decoder.
+  GpuVideoDecoderHostState state_;
+
+  // We are not able to push all received buffer to gpu process at once.
+  std::deque<scoped_refptr<Buffer> > input_buffer_queue_;
+
+  // Currently we do not use ring buffer in input buffer, therefore before
+  // GPU process had finished access it, we should not touch it.
+  bool input_buffer_busy_;
+
+  // Transfer buffers for both input and output.
+  // TODO(jiesun): remove output buffer when hardware composition is ready.
+  scoped_ptr<base::SharedMemory> input_transfer_buffer_;
+  scoped_ptr<base::SharedMemory> output_transfer_buffer_;
+
+  DISALLOW_COPY_AND_ASSIGN(GpuVideoDecoderHost);
+};
+
+#endif  // CHROME_RENDERER_GPU_VIDEO_DECODER_HOST_H_
+