1// Copyright (c) 2012 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef CONTENT_COMMON_GPU_CLIENT_GPU_VIDEO_DECODE_ACCELERATOR_HOST_H_
6#define CONTENT_COMMON_GPU_CLIENT_GPU_VIDEO_DECODE_ACCELERATOR_HOST_H_
7
8#include <vector>
9
10#include "base/memory/weak_ptr.h"
11#include "base/threading/non_thread_safe.h"
12#include "content/common/gpu/client/command_buffer_proxy_impl.h"
13#include "ipc/ipc_listener.h"
14#include "media/video/video_decode_accelerator.h"
15#include "ui/gfx/size.h"
16
17namespace content {
18class GpuChannelHost;
19
20// This class is used to talk to VideoDecodeAccelerator in the Gpu process
21// through IPC messages.
22class GpuVideoDecodeAcceleratorHost
23    : public IPC::Listener,
24      public media::VideoDecodeAccelerator,
25      public CommandBufferProxyImpl::DeletionObserver,
26      public base::NonThreadSafe {
27 public:
28  // |this| is guaranteed not to outlive |channel| and |impl|.  (See comments
29  // for |channel_| and |impl_|.)
30  GpuVideoDecodeAcceleratorHost(GpuChannelHost* channel,
31                                CommandBufferProxyImpl* impl);
32
33  // IPC::Listener implementation.
34  virtual void OnChannelError() OVERRIDE;
35  virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
36
37  // media::VideoDecodeAccelerator implementation.
38  virtual bool Initialize(media::VideoCodecProfile profile,
39                          Client* client) OVERRIDE;
40  virtual void Decode(const media::BitstreamBuffer& bitstream_buffer) OVERRIDE;
41  virtual void AssignPictureBuffers(
42      const std::vector<media::PictureBuffer>& buffers) OVERRIDE;
43  virtual void ReusePictureBuffer(int32 picture_buffer_id) OVERRIDE;
44  virtual void Flush() OVERRIDE;
45  virtual void Reset() OVERRIDE;
46  virtual void Destroy() OVERRIDE;
47
48  // CommandBufferProxyImpl::DeletionObserver implemetnation.
49  virtual void OnWillDeleteImpl() OVERRIDE;
50
51 private:
52  // Only Destroy() should be deleting |this|.
53  virtual ~GpuVideoDecodeAcceleratorHost();
54
55  // Notify |client_| of an error.  Posts a task to avoid re-entrancy.
56  void PostNotifyError(Error);
57
58  void Send(IPC::Message* message);
59
60  // IPC handlers, proxying media::VideoDecodeAccelerator::Client for the GPU
61  // process.  Should not be called directly.
62  void OnBitstreamBufferProcessed(int32 bitstream_buffer_id);
63  void OnProvidePictureBuffer(uint32 num_requested_buffers,
64                              const gfx::Size& dimensions,
65                              uint32 texture_target);
66  void OnDismissPictureBuffer(int32 picture_buffer_id);
67  void OnPictureReady(int32 picture_buffer_id,
68                      int32 bitstream_buffer_id,
69                      const gfx::Rect& visible_rect);
70  void OnFlushDone();
71  void OnResetDone();
72  void OnNotifyError(uint32 error);
73
74  // Unowned reference to the GpuChannelHost to send IPC messages to the GPU
75  // process.  |channel_| outlives |impl_|, so the reference is always valid as
76  // long as it is not NULL.
77  GpuChannelHost* channel_;
78
79  // Route ID for the associated decoder in the GPU process.
80  int32 decoder_route_id_;
81
82  // The client that will receive callbacks from the decoder.
83  Client* client_;
84
85  // Unowned reference to the CommandBufferProxyImpl that created us.  |this|
86  // registers as a DeletionObserver of |impl_|, the so reference is always
87  // valid as long as it is not NULL.
88  CommandBufferProxyImpl* impl_;
89
90  // Requested dimensions of the buffer, from ProvidePictureBuffers().
91  gfx::Size picture_buffer_dimensions_;
92
93  // WeakPtr factory for posting tasks back to itself.
94  base::WeakPtrFactory<GpuVideoDecodeAcceleratorHost> weak_this_factory_;
95
96  DISALLOW_COPY_AND_ASSIGN(GpuVideoDecodeAcceleratorHost);
97};
98
99}  // namespace content
100
101#endif  // CONTENT_COMMON_GPU_CLIENT_GPU_VIDEO_DECODE_ACCELERATOR_HOST_H_
102