content/browser/renderer_host/media/video_capture_texture_wrapper.h

   1 // Copyright 2015 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_BROWSER_RENDERER_HOST_MEDIA_VIDEO_CAPTURE_TEXTURE_WRAPPER_H_
   6 #define CONTENT_BROWSER_RENDERER_HOST_MEDIA_VIDEO_CAPTURE_TEXTURE_WRAPPER_H_
   7
   8 #include "base/memory/linked_ptr.h"
   9 #include "base/memory/ref_counted.h"
  10 #include "base/memory/scoped_ptr.h"
  11 #include "base/single_thread_task_runner.h"
  12 #include "content/browser/renderer_host/media/video_capture_device_client.h"
  13 #include "content/common/content_export.h"
  14 #include "media/video/capture/video_capture_device.h"
  15
  16 namespace content {
  17
  18 // VideoCaptureDeviceClient derived class for copying incoming memory-backed
  19 // video data into a GpuMemoryBuffer (in turn into a VideoFrame), and sending it
  20 // to |controller_|. Construction happens on IO Thread, whereas calls to
  21 // OnIncomingCapturedData() come from wherever capture happens which might be,
  22 // and often is, an OS thread different from Device Thread.
  23 //
  24 // It has an internal ref counted TextureWrapperDelegate class used to do all
  25 // the work. This class creates and manages the necessary interactions with the
  26 // GPU process for the texture uploading. This delegate is needed since the
  27 // frame producer needs to own us, but we need to launch PostTask()s.
  28 //
  29 // TODO(mcasas): ctor |frame_format| is used for early GpuMemoryBuffer pool
  30 // allocation, but VideoCaptureDevices might provide a different resolution when
  31 // calling OnIncomingCapturedData(). What should we do then...?
  32
  33 class CONTENT_EXPORT VideoCaptureTextureWrapper final
  34     : public VideoCaptureDeviceClient {
  35  public:
  36   VideoCaptureTextureWrapper(
  37       const base::WeakPtr<VideoCaptureController>& controller,
  38       const scoped_refptr<VideoCaptureBufferPool>& buffer_pool,
  39       const scoped_refptr<base::SingleThreadTaskRunner>& capture_task_runner,
  40       const media::VideoCaptureFormat& capture_format);
  41   ~VideoCaptureTextureWrapper() override;
  42
  43   // Single media::VideoCaptureDevice::Client overriden method.
  44   void OnIncomingCapturedData(const uint8* data,
  45                               int length,
  46                               const media::VideoCaptureFormat& frame_format,
  47                               int clockwise_rotation,
  48                               const base::TimeTicks& timestamp) override;
  49
  50  private:
  51   class TextureWrapperDelegate;
  52   // Internal delegate doing most of the work.
  53   scoped_refptr<TextureWrapperDelegate> wrapper_delegate_;
  54   // Reference to Capture Thread task runner.
  55   const scoped_refptr<base::SingleThreadTaskRunner> capture_task_runner_;
  56
  57   DISALLOW_COPY_AND_ASSIGN(VideoCaptureTextureWrapper);
  58 };
  59
  60 }  // namespace content
  61
  62 #endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_VIDEO_CAPTURE_TEXTURE_WRAPPER_H_