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// Copyright (c) 2010 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "remoting/base/decoder_verbatim.h"
#include "remoting/base/protocol_util.h"
namespace remoting {
DecoderVerbatim::DecoderVerbatim()
: state_(kWaitingForBeginRect),
rect_x_(0),
rect_y_(0),
rect_width_(0),
rect_height_(0),
bytes_per_pixel_(0),
updated_rects_(NULL),
reverse_rows_(true) {
encoding_ = EncodingNone;
}
bool DecoderVerbatim::BeginDecode(scoped_refptr<media::VideoFrame> frame,
UpdatedRects* updated_rects,
Task* partial_decode_done,
Task* decode_done) {
DCHECK(!partial_decode_done_.get());
DCHECK(!decode_done_.get());
DCHECK(!updated_rects_);
DCHECK_EQ(kWaitingForBeginRect, state_);
DCHECK(!started_);
partial_decode_done_.reset(partial_decode_done);
decode_done_.reset(decode_done);
updated_rects_ = updated_rects;
// TODO(hclam): Check if we can accept the color format of the video frame
// and the codec.
frame_ = frame;
started_ = true;
return true;
}
bool DecoderVerbatim::PartialDecode(ChromotingHostMessage* message) {
scoped_ptr<ChromotingHostMessage> msg_deleter(message);
DCHECK(message->has_update_stream_packet());
DCHECK(started_);
bool ret = true;
if (message->update_stream_packet().has_begin_rect())
ret = HandleBeginRect(message);
if (ret && message->update_stream_packet().has_rect_data())
ret = HandleRectData(message);
if (ret && message->update_stream_packet().has_end_rect())
ret = HandleEndRect(message);
return ret;
}
void DecoderVerbatim::EndDecode() {
DCHECK_EQ(kWaitingForBeginRect, state_);
DCHECK(started_);
decode_done_->Run();
partial_decode_done_.reset();
decode_done_.reset();
frame_ = NULL;
updated_rects_ = NULL;
started_ = false;
}
bool DecoderVerbatim::HandleBeginRect(ChromotingHostMessage* message) {
DCHECK_EQ(kWaitingForBeginRect, state_);
state_ = kWaitingForRectData;
rect_width_ = message->update_stream_packet().begin_rect().width();
rect_height_ = message->update_stream_packet().begin_rect().height();
rect_x_ = message->update_stream_packet().begin_rect().x();
rect_y_ = message->update_stream_packet().begin_rect().y();
PixelFormat pixel_format =
message->update_stream_packet().begin_rect().pixel_format();
if (static_cast<PixelFormat>(frame_->format()) != pixel_format) {
NOTREACHED() << "Pixel format of message doesn't match the video frame. "
"Expected vs received = "
<< frame_->format() << " vs " << pixel_format
<< " Color space conversion required.";
return false;
}
bytes_per_pixel_ = GetBytesPerPixel(pixel_format);
return true;
}
bool DecoderVerbatim::HandleRectData(ChromotingHostMessage* message) {
DCHECK_EQ(kWaitingForRectData, state_);
DCHECK_EQ(0,
message->update_stream_packet().rect_data().sequence_number());
// Copy the data line by line.
const int src_stride = bytes_per_pixel_ * rect_width_;
const char* src =
message->update_stream_packet().rect_data().data().data();
// Make sure there's enough data in |message|.
const int src_size =
message->update_stream_packet().rect_data().data().length();
if (src_size != src_stride * rect_height_)
return false;
// Make sure there's enough space for us to write to.
if (frame_->height() < static_cast<size_t>(rect_height_) ||
frame_->stride(media::VideoFrame::kRGBPlane) < src_stride) {
return false;
}
int src_stride_dir = src_stride;
if (reverse_rows_) {
// Copy rows from bottom to top to flip the image vertically.
src += (rect_height_ - 1) * src_stride;
// Change the direction of the stride to work bottom to top.
src_stride_dir *= -1;
}
const int dest_stride = frame_->stride(media::VideoFrame::kRGBPlane);
uint8* dest = frame_->data(media::VideoFrame::kRGBPlane) +
dest_stride * rect_y_ + bytes_per_pixel_ * rect_x_;
for (int i = 0; i < rect_height_; ++i) {
memcpy(dest, src, src_stride);
dest += dest_stride;
src += src_stride_dir;
}
updated_rects_->clear();
updated_rects_->push_back(gfx::Rect(rect_x_, rect_y_,
rect_width_, rect_height_));
partial_decode_done_->Run();
return true;
}
bool DecoderVerbatim::HandleEndRect(ChromotingHostMessage* message) {
DCHECK_EQ(kWaitingForRectData, state_);
state_ = kWaitingForBeginRect;
return true;
}
} // namespace remoting
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