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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/40285824): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif
#include "remoting/codec/video_encoder_verbatim.h"
#include <stddef.h>
#include <stdint.h>
#include "base/check.h"
#include "remoting/base/util.h"
#include "remoting/proto/video.pb.h"
#include "third_party/webrtc/modules/desktop_capture/desktop_frame.h"
#include "third_party/webrtc/modules/desktop_capture/desktop_geometry.h"
#include "third_party/webrtc/modules/desktop_capture/desktop_region.h"
namespace remoting {
static uint8_t* GetPacketOutputBuffer(VideoPacket* packet, size_t size) {
packet->mutable_data()->resize(size);
return reinterpret_cast<uint8_t*>(std::data(*packet->mutable_data()));
}
VideoEncoderVerbatim::VideoEncoderVerbatim() = default;
VideoEncoderVerbatim::~VideoEncoderVerbatim() = default;
std::unique_ptr<VideoPacket> VideoEncoderVerbatim::Encode(
const webrtc::DesktopFrame& frame) {
DCHECK(frame.data());
// If nothing has changed in the frame then return NULL to indicate that
// we don't need to actually send anything (e.g. nothing to top-off).
if (frame.updated_region().is_empty()) {
return nullptr;
}
// Create a VideoPacket with common fields (e.g. DPI, rects, shape) set.
std::unique_ptr<VideoPacket> packet(helper_.CreateVideoPacket(frame));
packet->mutable_format()->set_encoding(VideoPacketFormat::ENCODING_VERBATIM);
// Calculate output size.
size_t output_size = 0;
for (webrtc::DesktopRegion::Iterator iter(frame.updated_region());
!iter.IsAtEnd(); iter.Advance()) {
const webrtc::DesktopRect& rect = iter.rect();
output_size +=
rect.width() * rect.height() * webrtc::DesktopFrame::kBytesPerPixel;
}
uint8_t* out = GetPacketOutputBuffer(packet.get(), output_size);
const int in_stride = frame.stride();
// Encode pixel data for all changed rectangles into the packet.
for (webrtc::DesktopRegion::Iterator iter(frame.updated_region());
!iter.IsAtEnd(); iter.Advance()) {
const webrtc::DesktopRect& rect = iter.rect();
const int row_size = webrtc::DesktopFrame::kBytesPerPixel * rect.width();
const uint8_t* in = frame.data() + rect.top() * in_stride +
rect.left() * webrtc::DesktopFrame::kBytesPerPixel;
for (int y = rect.top(); y < rect.top() + rect.height(); ++y) {
memcpy(out, in, row_size);
out += row_size;
in += in_stride;
}
}
return packet;
}
} // namespace remoting
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