remoting/codec/video_decoder_verbatim.cc

   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 #include "remoting/codec/video_decoder_verbatim.h"
   6
   7 #include "base/logging.h"
   8 #include "remoting/base/util.h"
   9
  10 namespace remoting {
  11
  12 VideoDecoderVerbatim::VideoDecoderVerbatim() {}
  13
  14 VideoDecoderVerbatim::~VideoDecoderVerbatim() {}
  15
  16 bool VideoDecoderVerbatim::DecodePacket(const VideoPacket& packet) {
  17   if (packet.format().has_screen_width() &&
  18       packet.format().has_screen_height()) {
  19     webrtc::DesktopSize screen_size(packet.format().screen_width(),
  20                                     packet.format().screen_height());
  21     // Allocate the screen buffer, if necessary.
  22     if (!screen_size.equals(screen_size_)) {
  23       screen_size_ = screen_size;
  24       screen_buffer_.reset(new uint8[screen_size_.width() *
  25                                      screen_size_.height() * kBytesPerPixel]);
  26       updated_region_.Clear();
  27     }
  28   }
  29
  30   webrtc::DesktopRegion region;
  31
  32   const char* in = packet.data().data();
  33   int stride = kBytesPerPixel * screen_size_.width();
  34   for (int i = 0; i < packet.dirty_rects_size(); ++i) {
  35     Rect proto_rect = packet.dirty_rects(i);
  36     webrtc::DesktopRect rect =
  37         webrtc::DesktopRect::MakeXYWH(proto_rect.x(),
  38                                       proto_rect.y(),
  39                                       proto_rect.width(),
  40                                       proto_rect.height());
  41     region.AddRect(rect);
  42
  43     if (!DoesRectContain(webrtc::DesktopRect::MakeSize(screen_size_), rect)) {
  44       LOG(ERROR) << "Invalid packet received";
  45       return false;
  46     }
  47
  48     int rect_row_size = kBytesPerPixel * rect.width();
  49     uint8_t* out = screen_buffer_.get() + rect.top() * stride +
  50                    rect.left() * kBytesPerPixel;
  51     for (int y = rect.top(); y < rect.top() + rect.height(); ++y) {
  52       if (in + rect_row_size > packet.data().data() + packet.data().size()) {
  53         LOG(ERROR) << "Invalid packet received";
  54         return false;
  55       }
  56       memcpy(out, in, rect_row_size);
  57       in += rect_row_size;
  58       out += stride;
  59     }
  60   }
  61
  62   if (in != packet.data().data() + packet.data().size()) {
  63     LOG(ERROR) << "Invalid packet received";
  64     return false;
  65   }
  66
  67   updated_region_.AddRegion(region);
  68
  69   return true;
  70 }
  71
  72 void VideoDecoderVerbatim::Invalidate(const webrtc::DesktopSize& view_size,
  73                                       const webrtc::DesktopRegion& region) {
  74   updated_region_.AddRegion(region);
  75 }
  76
  77 void VideoDecoderVerbatim::RenderFrame(const webrtc::DesktopSize& view_size,
  78                                        const webrtc::DesktopRect& clip_area,
  79                                        uint8* image_buffer,
  80                                        int image_stride,
  81                                        webrtc::DesktopRegion* output_region) {
  82   output_region->Clear();
  83
  84   // TODO(alexeypa): scaling is not implemented.
  85   webrtc::DesktopRect clip_rect = webrtc::DesktopRect::MakeSize(screen_size_);
  86   clip_rect.IntersectWith(clip_area);
  87   if (clip_rect.is_empty())
  88     return;
  89
  90   int screen_stride = screen_size_.width() * kBytesPerPixel;
  91
  92   for (webrtc::DesktopRegion::Iterator i(updated_region_);
  93        !i.IsAtEnd(); i.Advance()) {
  94     webrtc::DesktopRect rect(i.rect());
  95     rect.IntersectWith(clip_rect);
  96     if (rect.is_empty())
  97       continue;
  98
  99     CopyRGB32Rect(screen_buffer_.get(), screen_stride,
 100                   clip_rect,
 101                   image_buffer, image_stride,
 102                   clip_area,
 103                   rect);
 104     output_region->AddRect(rect);
 105   }
 106
 107   updated_region_.Clear();
 108 }
 109
 110 const webrtc::DesktopRegion* VideoDecoderVerbatim::GetImageShape() {
 111   return nullptr;
 112 }
 113
 114 }  // namespace remoting