content/common/gpu/client/gpu_video_decode_accelerator_host.h

   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
  17 namespace content {
  18 class GpuChannelHost;
  19
  20 // This class is used to talk to VideoDecodeAccelerator in the Gpu process
  21 // through IPC messages.
  22 class 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, int32 bitstream_buffer_id);
  68   void OnFlushDone();
  69   void OnResetDone();
  70   void OnNotifyError(uint32 error);
  71
  72   // Unowned reference to the GpuChannelHost to send IPC messages to the GPU
  73   // process.  |channel_| outlives |impl_|, so the reference is always valid as
  74   // long as it is not NULL.
  75   GpuChannelHost* channel_;
  76
  77   // Route ID for the associated decoder in the GPU process.
  78   int32 decoder_route_id_;
  79
  80   // The client that will receive callbacks from the decoder.
  81   Client* client_;
  82
  83   // Unowned reference to the CommandBufferProxyImpl that created us.  |this|
  84   // registers as a DeletionObserver of |impl_|, the so reference is always
  85   // valid as long as it is not NULL.
  86   CommandBufferProxyImpl* impl_;
  87
  88   // Requested dimensions of the buffer, from ProvidePictureBuffers().
  89   gfx::Size picture_buffer_dimensions_;
  90
  91   // WeakPtr factory for posting tasks back to itself.
  92   base::WeakPtrFactory<GpuVideoDecodeAcceleratorHost> weak_this_factory_;
  93
  94   DISALLOW_COPY_AND_ASSIGN(GpuVideoDecodeAcceleratorHost);
  95 };
  96
  97 }  // namespace content
  98
  99 #endif  // CONTENT_COMMON_GPU_CLIENT_GPU_VIDEO_DECODE_ACCELERATOR_HOST_H_