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#include "third_party/webrtc/modules/desktop_capture/desktop_geometry.h"
14#include "third_party/webrtc/modules/desktop_capture/desktop_region.h"
15
16namespace remoting {
17
18static uint8_t* GetPacketOutputBuffer(VideoPacket* packet, size_t size) {
19  packet->mutable_data()->resize(size);
20  return reinterpret_cast<uint8_t*>(string_as_array(packet->mutable_data()));
21}
22
23VideoEncoderVerbatim::VideoEncoderVerbatim() {}
24VideoEncoderVerbatim::~VideoEncoderVerbatim() {}
25
26scoped_ptr<VideoPacket> VideoEncoderVerbatim::Encode(
27    const webrtc::DesktopFrame& frame) {
28  CHECK(frame.data());
29
30  base::Time encode_start_time = base::Time::Now();
31
32  // Create a VideoPacket with common fields (e.g. DPI, rects, shape) set.
33  scoped_ptr<VideoPacket> packet(helper_.CreateVideoPacket(frame));
34  packet->mutable_format()->set_encoding(VideoPacketFormat::ENCODING_VERBATIM);
35
36  // Calculate output size.
37  size_t output_size = 0;
38  for (webrtc::DesktopRegion::Iterator iter(frame.updated_region());
39       !iter.IsAtEnd(); iter.Advance()) {
40    const webrtc::DesktopRect& rect = iter.rect();
41    output_size += rect.width() * rect.height() *
42        webrtc::DesktopFrame::kBytesPerPixel;
43  }
44
45  uint8_t* out = GetPacketOutputBuffer(packet.get(), output_size);
46  const int in_stride = frame.stride();
47
48  // Encode pixel data for all changed rectangles into the packet.
49  for (webrtc::DesktopRegion::Iterator iter(frame.updated_region());
50       !iter.IsAtEnd(); iter.Advance()) {
51    const webrtc::DesktopRect& rect = iter.rect();
52    const int row_size = webrtc::DesktopFrame::kBytesPerPixel * rect.width();
53    const uint8_t* in = frame.data() + rect.top() * in_stride +
54                        rect.left() * webrtc::DesktopFrame::kBytesPerPixel;
55    for (int y = rect.top(); y < rect.top() + rect.height(); ++y) {
56      memcpy(out, in, row_size);
57      out += row_size;
58      in += in_stride;
59    }
60  }
61
62  // Note the time taken to encode the pixel data.
63  packet->set_encode_time_ms(
64      (base::Time::Now() - encode_start_time).InMillisecondsRoundedUp());
65
66  return packet.Pass();
67}
68
69}  // namespace remoting
70