remoting/codec/video_decoder_vp8.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 REMOTING_CODEC_VIDEO_DECODER_VP8_H_
   6 #define REMOTING_CODEC_VIDEO_DECODER_VP8_H_
   7
   8 #include "base/compiler_specific.h"
   9 #include "remoting/codec/video_decoder.h"
  10
  11 typedef struct vpx_codec_ctx vpx_codec_ctx_t;
  12 typedef struct vpx_image vpx_image_t;
  13
  14 namespace remoting {
  15
  16 class VideoDecoderVp8 : public VideoDecoder {
  17  public:
  18   VideoDecoderVp8();
  19   virtual ~VideoDecoderVp8();
  20
  21   // VideoDecoder implementations.
  22   virtual void Initialize(const SkISize& screen_size) OVERRIDE;
  23   virtual DecodeResult DecodePacket(const VideoPacket* packet) OVERRIDE;
  24   virtual bool IsReadyForData() OVERRIDE;
  25   virtual VideoPacketFormat::Encoding Encoding() OVERRIDE;
  26   virtual void Invalidate(const SkISize& view_size,
  27                           const SkRegion& region) OVERRIDE;
  28   virtual void RenderFrame(const SkISize& view_size,
  29                            const SkIRect& clip_area,
  30                            uint8* image_buffer,
  31                            int image_stride,
  32                            SkRegion* output_region) OVERRIDE;
  33   virtual const SkRegion* GetImageShape() OVERRIDE;
  34
  35  private:
  36   enum State {
  37     kUninitialized,
  38     kReady,
  39     kError,
  40   };
  41
  42   // Fills the rectangle |rect| with the given ARGB color |color| in |buffer|.
  43   void FillRect(uint8* buffer, int stride, const SkIRect& rect, uint32 color);
  44
  45   // Calculates the difference between the desktop shape regions in two
  46   // consecutive frames and updates |updated_region_| and |transparent_region_|
  47   // accordingly.
  48   void UpdateImageShapeRegion(SkRegion* new_desktop_shape);
  49
  50   // The internal state of the decoder.
  51   State state_;
  52
  53   vpx_codec_ctx_t* codec_;
  54
  55   // Pointer to the last decoded image.
  56   vpx_image_t* last_image_;
  57
  58   // The region updated that hasn't been copied to the screen yet.
  59   SkRegion updated_region_;
  60
  61   // Output dimensions.
  62   SkISize screen_size_;
  63
  64   // The region occupied by the top level windows.
  65   SkRegion desktop_shape_;
  66
  67   // The region that should be make transparent.
  68   SkRegion transparent_region_;
  69
  70   DISALLOW_COPY_AND_ASSIGN(VideoDecoderVp8);
  71 };
  72
  73 }  // namespace remoting
  74
  75 #endif  // REMOTING_CODEC_VIDEO_DECODER_VP8_H_