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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_zlib.h"
#include "remoting/base/decompressor_zlib.h"
#include "remoting/base/protocol_util.h"
namespace remoting {
DecoderZlib::DecoderZlib()
: state_(kWaitingForBeginRect),
rect_x_(0),
rect_y_(0),
rect_width_(0),
rect_height_(0),
bytes_per_pixel_(0),
updated_rects_(NULL),
row_pos_(0),
row_y_(0),
// TODO(hclam): We should use the information from the update stream
// to determine whether we should reverse the rows or not.
// But for simplicity we set to be always true.
reverse_rows_(true) {
encoding_ = EncodingZlib;
}
bool DecoderZlib::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_);
if (static_cast<PixelFormat>(frame->format()) != PixelFormatRgb32) {
LOG(INFO) << "DecoderZlib only supports RGB32.";
return false;
}
partial_decode_done_.reset(partial_decode_done);
decode_done_.reset(decode_done);
updated_rects_ = updated_rects;
frame_ = frame;
// Create the decompressor.
decompressor_.reset(new DecompressorZlib());
started_ = true;
return true;
}
bool DecoderZlib::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 DecoderZlib::EndDecode() {
DCHECK_EQ(kWaitingForBeginRect, state_);
DCHECK(started_);
decode_done_->Run();
partial_decode_done_.reset();
decode_done_.reset();
updated_rects_ = NULL;
frame_ = NULL;
decompressor_.reset();
started_ = false;
}
bool DecoderZlib::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);
row_pos_ = 0;
row_y_ = 0;
return true;
}
bool DecoderZlib::HandleRectData(ChromotingHostMessage* message) {
DCHECK_EQ(kWaitingForRectData, state_);
DCHECK_EQ(0,
message->update_stream_packet().rect_data().sequence_number());
const uint8* in =
(const uint8*)message->update_stream_packet().rect_data().data().data();
const int in_size =
message->update_stream_packet().rect_data().data().size();
const int row_size = rect_width_ * bytes_per_pixel_;
int stride = frame_->stride(media::VideoFrame::kRGBPlane);
uint8* rect_begin = frame_->data(media::VideoFrame::kRGBPlane);
if (reverse_rows_) {
// Advance the pointer to the last row.
rect_begin += (frame_->height() - 1) * stride;
// And then make the stride negative.
stride = -stride;
}
uint8* out = rect_begin + stride * (rect_y_ + row_y_) +
bytes_per_pixel_ * rect_x_;
// Consume all the data in the message.
bool decompress_again = true;
int used = 0;
while (decompress_again && used < in_size) {
int written = 0;
int consumed = 0;
decompress_again = decompressor_->Process(
in + used, in_size - used, out + row_pos_, row_size - row_pos_,
&consumed, &written);
used += consumed;
row_pos_ += written;
// If this row is completely filled then move onto the next row.
if (row_pos_ == row_size) {
++row_y_;
row_pos_ = 0;
out += stride;
}
}
return true;
}
bool DecoderZlib::HandleEndRect(ChromotingHostMessage* message) {
DCHECK_EQ(kWaitingForRectData, state_);
state_ = kWaitingForBeginRect;
updated_rects_->clear();
updated_rects_->push_back(gfx::Rect(rect_x_, rect_y_,
rect_width_, rect_height_));
partial_decode_done_->Run();
return true;
}
} // namespace remoting
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