remoting/codec/video_encoder_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_encoder_verbatim.h"
   6
   7 #include "base/logging.h"
   8 #include "base/stl_util.h"
   9 #include "base/time/time.h"
  10 #include "remoting/base/util.h"
  11 #include "remoting/proto/video.pb.h"
  12 #include "third_party/webrtc/modules/desktop_capture/desktop_frame.h"
  13
  14 namespace remoting {
  15
  16 VideoEncoderVerbatim::VideoEncoderVerbatim() {}
  17 VideoEncoderVerbatim::~VideoEncoderVerbatim() {}
  18
  19 scoped_ptr<VideoPacket> VideoEncoderVerbatim::Encode(
  20     const webrtc::DesktopFrame& frame) {
  21   CHECK(frame.data());
  22
  23   base::Time encode_start_time = base::Time::Now();
  24   scoped_ptr<VideoPacket> packet(new VideoPacket());
  25
  26   VideoPacketFormat* format = packet->mutable_format();
  27   format->set_encoding(VideoPacketFormat::ENCODING_VERBATIM);
  28   if (!frame.size().equals(screen_size_)) {
  29     screen_size_ = frame.size();
  30     format->set_screen_width(screen_size_.width());
  31     format->set_screen_height(screen_size_.height());
  32   }
  33
  34   // Calculate output size.
  35   size_t output_size = 0;
  36   for (webrtc::DesktopRegion::Iterator iter(frame.updated_region());
  37        !iter.IsAtEnd(); iter.Advance()) {
  38     const webrtc::DesktopRect& rect = iter.rect();
  39     output_size += rect.width() * rect.height() *
  40         webrtc::DesktopFrame::kBytesPerPixel;
  41   }
  42
  43   uint8_t* out = GetOutputBuffer(packet.get(), output_size);
  44   const int in_stride = frame.stride();
  45
  46   // Store all changed rectangles in the packet.
  47   for (webrtc::DesktopRegion::Iterator iter(frame.updated_region());
  48        !iter.IsAtEnd(); iter.Advance()) {
  49     const webrtc::DesktopRect& rect = iter.rect();
  50     const int row_size = webrtc::DesktopFrame::kBytesPerPixel * rect.width();
  51     const uint8_t* in = frame.data() + rect.top() * in_stride +
  52                         rect.left() * webrtc::DesktopFrame::kBytesPerPixel;
  53     for (int y = rect.top(); y < rect.top() + rect.height(); ++y) {
  54       memcpy(out, in, row_size);
  55       out += row_size;
  56       in += in_stride;
  57     }
  58
  59     Rect* dirty_rect = packet->add_dirty_rects();
  60     dirty_rect->set_x(rect.left());
  61     dirty_rect->set_y(rect.top());
  62     dirty_rect->set_width(rect.width());
  63     dirty_rect->set_height(rect.height());
  64   }
  65
  66   packet->set_capture_time_ms(frame.capture_time_ms());
  67   packet->set_encode_time_ms(
  68       (base::Time::Now() - encode_start_time).InMillisecondsRoundedUp());
  69   if (!frame.dpi().is_zero()) {
  70     packet->mutable_format()->set_x_dpi(frame.dpi().x());
  71     packet->mutable_format()->set_y_dpi(frame.dpi().y());
  72   }
  73
  74   return packet.Pass();
  75 }
  76
  77 uint8_t* VideoEncoderVerbatim::GetOutputBuffer(VideoPacket* packet,
  78                                                size_t size) {
  79   packet->mutable_data()->resize(size);
  80   return reinterpret_cast<uint8_t*>(string_as_array(packet->mutable_data()));
  81 }
  82
  83 }  // namespace remoting