Upstream version 10.39.225.0
[platform/framework/web/crosswalk.git] / src / 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 #include "third_party/webrtc/modules/desktop_capture/desktop_geometry.h"
14 #include "third_party/webrtc/modules/desktop_capture/desktop_region.h"
15
16 namespace remoting {
17
18 static 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
23 VideoEncoderVerbatim::VideoEncoderVerbatim() {}
24 VideoEncoderVerbatim::~VideoEncoderVerbatim() {}
25
26 scoped_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