Introduce GpuVideoDecodeAcceleratorFactory.

content/common/gpu/media/v4l2_video_decode_accelerator.h

 // Copyright 2014 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.
 //
 // This file contains an implementation of VideoDecodeAccelerator
 // that utilizes hardware video decoders, which expose Video4Linux 2 API
 // (http://linuxtv.org/downloads/v4l-dvb-apis/).
 
 #ifndef CONTENT_COMMON_GPU_MEDIA_V4L2_VIDEO_DECODE_ACCELERATOR_H_
 #define CONTENT_COMMON_GPU_MEDIA_V4L2_VIDEO_DECODE_ACCELERATOR_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <queue>
 #include <vector>
 
 #include "base/callback_forward.h"
 #include "base/macros.h"
 #include "base/memory/linked_ptr.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/threading/thread.h"
 #include "content/common/content_export.h"
+#include "content/common/gpu/media/gpu_video_decode_accelerator_helpers.h"
 #include "content/common/gpu/media/v4l2_device.h"
 #include "media/base/limits.h"
 #include "media/base/video_decoder_config.h"
 #include "media/video/picture.h"
 #include "media/video/video_decode_accelerator.h"
 #include "ui/gfx/geometry/size.h"
 #include "ui/gl/gl_bindings.h"
 
 namespace media {
 class H264Parser;
@@ skipping 35 matching lines @@
 // the required number of output buffers from the device and that cannot be done
 // unless we free the previous set of buffers, leaving the decoding in a
 // inoperable state for the duration of the wait for Pictures. So to prevent
 // subtle races (esp. if we get Reset() in the meantime), we block the decoder
 // thread while we wait for AssignPictureBuffers from the client.
 class CONTENT_EXPORT V4L2VideoDecodeAccelerator
     : public media::VideoDecodeAccelerator {
  public:
   V4L2VideoDecodeAccelerator(
       EGLDisplay egl_display,
-      EGLContext egl_context,
-      const base::WeakPtr<Client>& io_client_,
-      const base::Callback<bool(void)>& make_context_current,
-      const scoped_refptr<V4L2Device>& device,
-      const scoped_refptr<base::SingleThreadTaskRunner>& io_task_runner);
+      const GetGLContextCallback& get_gl_context_cb,
+      const MakeGLContextCurrentCallback& make_context_current_cb,
+      const scoped_refptr<V4L2Device>& device);
   ~V4L2VideoDecodeAccelerator() override;
 
   // media::VideoDecodeAccelerator implementation.
   // Note: Initialize() and Destroy() are synchronous.
   bool Initialize(const Config& config, Client* client) override;
   void Decode(const media::BitstreamBuffer& bitstream_buffer) override;
   void AssignPictureBuffers(
       const std::vector<media::PictureBuffer>& buffers) override;
   void ReusePictureBuffer(int32_t picture_buffer_id) override;
   void Flush() override;
   void Reset() override;
   void Destroy() override;
-  bool CanDecodeOnIOThread() override;
+  bool TryToSetupDecodeOnSeparateThread(
+      const base::WeakPtr<Client>& decode_client,
+      const scoped_refptr<base::SingleThreadTaskRunner>& decode_task_runner)
+      override;
 
   static media::VideoDecodeAccelerator::SupportedProfiles
       GetSupportedProfiles();
 
  private:
   // These are rather subjectively tuned.
   enum {
     kInputBufferCount = 8,
     // TODO(posciak): determine input buffer size based on level limits.
     // See http://crbug.com/255116.
@@ skipping 200 matching lines @@
 
   // Send decoded pictures to PictureReady.
   void SendPictureReady();
 
   // Callback that indicates a picture has been cleared.
   void PictureCleared();
 
   // Our original calling task runner for the child thread.
   scoped_refptr<base::SingleThreadTaskRunner> child_task_runner_;
 
-  // Task runner of the IO thread.
-  scoped_refptr<base::SingleThreadTaskRunner> io_task_runner_;
+  // Task runner Decode() and PictureReady() run on.
+  scoped_refptr<base::SingleThreadTaskRunner> decode_task_runner_;
 
   // WeakPtr<> pointing to |this| for use in posting tasks from the decoder or
   // device worker threads back to the child thread.  Because the worker threads
   // are members of this class, any task running on those threads is guaranteed
   // that this object is still alive.  As a result, tasks posted from the child
   // thread to the decoder or device thread should use base::Unretained(this),
   // and tasks posted the other way should use |weak_this_|.
   base::WeakPtr<V4L2VideoDecodeAccelerator> weak_this_;
 
   // To expose client callbacks from VideoDecodeAccelerator.
   // NOTE: all calls to these objects *MUST* be executed on
   // child_task_runner_.
   scoped_ptr<base::WeakPtrFactory<Client> > client_ptr_factory_;
   base::WeakPtr<Client> client_;
-  // Callbacks to |io_client_| must be executed on |io_task_runner_|.
-  base::WeakPtr<Client> io_client_;
+  // Callbacks to |decode_client_| must be executed on |decode_task_runner_|.
+  base::WeakPtr<Client> decode_client_;
 
   //
   // Decoder state, owned and operated by decoder_thread_.
   // Before decoder_thread_ has started, the decoder state is managed by
   // the child (main) thread.  After decoder_thread_ has started, the decoder
   // thread should be the only one managing these.
   //
 
   // This thread services tasks posted from the VDA API entry points by the
   // child thread and device service callbacks posted from the device thread.
@@ skipping 84 matching lines @@
   // The device polling thread handles notifications of V4L2 device changes.
   //
 
   // The thread.
   base::Thread device_poll_thread_;
 
   //
   // Other state, held by the child (main) thread.
   //
 
-  // Make our context current before running any EGL entry points.
-  base::Callback<bool(void)> make_context_current_;
-
   // EGL state
   EGLDisplay egl_display_;
-  EGLContext egl_context_;
+
+  // Callback to get current GLContext.
+  GetGLContextCallback get_gl_context_cb_;
+  // Callback to set the correct gl context.
+  MakeGLContextCurrentCallback make_context_current_cb_;
 
   // The codec we'll be decoding for.
   media::VideoCodecProfile video_profile_;
   // Chosen output format.
   uint32_t output_format_fourcc_;
 
   // Input format V4L2 fourccs this class supports.
   static const uint32_t supported_input_fourccs_[];
 
   // The WeakPtrFactory for |weak_this_|.
   base::WeakPtrFactory<V4L2VideoDecodeAccelerator> weak_this_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(V4L2VideoDecodeAccelerator);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_GPU_MEDIA_V4L2_VIDEO_DECODE_ACCELERATOR_H_