remoting/codec/video_decoder_vpx.h

   1 // Copyright 2013 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 REMOTING_CODEC_VIDEO_DECODER_VPX_H_
   6 #define REMOTING_CODEC_VIDEO_DECODER_VPX_H_
   7
   8 #include "base/compiler_specific.h"
   9 #include "base/memory/scoped_ptr.h"
  10 #include "remoting/codec/scoped_vpx_codec.h"
  11 #include "remoting/codec/video_decoder.h"
  12 #include "third_party/webrtc/modules/desktop_capture/desktop_geometry.h"
  13 #include "third_party/webrtc/modules/desktop_capture/desktop_region.h"
  14
  15 typedef struct vpx_image vpx_image_t;
  16
  17 namespace remoting {
  18
  19 class VideoDecoderVpx : public VideoDecoder {
  20  public:
  21   // Create decoders for the specified protocol.
  22   static scoped_ptr<VideoDecoderVpx> CreateForVP8();
  23   static scoped_ptr<VideoDecoderVpx> CreateForVP9();
  24
  25   ~VideoDecoderVpx() override;
  26
  27   // VideoDecoder interface.
  28   void Initialize(const webrtc::DesktopSize& screen_size) override;
  29   bool DecodePacket(const VideoPacket& packet) override;
  30   void Invalidate(const webrtc::DesktopSize& view_size,
  31                   const webrtc::DesktopRegion& region) override;
  32   void RenderFrame(const webrtc::DesktopSize& view_size,
  33                    const webrtc::DesktopRect& clip_area,
  34                    uint8* image_buffer,
  35                    int image_stride,
  36                    webrtc::DesktopRegion* output_region) override;
  37   const webrtc::DesktopRegion* GetImageShape() override;
  38
  39  private:
  40   explicit VideoDecoderVpx(ScopedVpxCodec codec);
  41
  42   // Calculates the difference between the desktop shape regions in two
  43   // consecutive frames and updates |updated_region_| and |transparent_region_|
  44   // accordingly.
  45   void UpdateImageShapeRegion(webrtc::DesktopRegion* new_desktop_shape);
  46
  47   ScopedVpxCodec codec_;
  48
  49   // Pointer to the last decoded image.
  50   vpx_image_t* last_image_;
  51
  52   // The region updated that hasn't been copied to the screen yet.
  53   webrtc::DesktopRegion updated_region_;
  54
  55   // Output dimensions.
  56   webrtc::DesktopSize screen_size_;
  57
  58   // The region occupied by the top level windows.
  59   webrtc::DesktopRegion desktop_shape_;
  60
  61   // The region that should be make transparent.
  62   webrtc::DesktopRegion transparent_region_;
  63
  64   DISALLOW_COPY_AND_ASSIGN(VideoDecoderVpx);
  65 };
  66
  67 }  // namespace remoting
  68
  69 #endif  // REMOTING_CODEC_VIDEO_DECODER_VP8_H_