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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_row_based.h"
#include "remoting/base/decompressor.h"
#include "remoting/base/decompressor_zlib.h"
#include "remoting/base/decompressor_verbatim.h"
#include "remoting/base/util.h"
namespace remoting {
namespace {
// Both input and output data are assumed to be RGBA32.
const int kBytesPerPixel = 4;
}
DecoderRowBased* DecoderRowBased::CreateZlibDecoder() {
return new DecoderRowBased(new DecompressorZlib(),
VideoPacketFormat::ENCODING_ZLIB);
}
DecoderRowBased* DecoderRowBased::CreateVerbatimDecoder() {
return new DecoderRowBased(new DecompressorVerbatim(),
VideoPacketFormat::ENCODING_VERBATIM);
}
DecoderRowBased::DecoderRowBased(Decompressor* decompressor,
VideoPacketFormat::Encoding encoding)
: state_(kUninitialized),
decompressor_(decompressor),
encoding_(encoding),
row_pos_(0),
row_y_(0) {
}
DecoderRowBased::~DecoderRowBased() {
}
void DecoderRowBased::Reset() {
frame_ = NULL;
decompressor_->Reset();
state_ = kUninitialized;
updated_rects_.clear();
}
bool DecoderRowBased::IsReadyForData() {
switch (state_) {
case kUninitialized:
case kError:
return false;
case kReady:
case kProcessing:
case kPartitionDone:
case kDone:
return true;
}
NOTREACHED();
return false;
}
void DecoderRowBased::Initialize(scoped_refptr<media::VideoFrame> frame) {
// Make sure we are not currently initialized.
CHECK_EQ(kUninitialized, state_);
if (frame->format() != media::VideoFrame::RGB32) {
LOG(WARNING) << "DecoderRowBased only supports RGB32.";
state_ = kError;
return;
}
frame_ = frame;
state_ = kReady;
}
Decoder::DecodeResult DecoderRowBased::DecodePacket(const VideoPacket* packet) {
UpdateStateForPacket(packet);
if (state_ == kError) {
return DECODE_ERROR;
}
const uint8* in = reinterpret_cast<const uint8*>(packet->data().data());
const int in_size = packet->data().size();
const int row_size = clip_.width() * kBytesPerPixel;
int stride = frame_->stride(media::VideoFrame::kRGBPlane);
uint8* rect_begin = frame_->data(media::VideoFrame::kRGBPlane);
uint8* out = rect_begin + stride * (clip_.y() + row_y_) +
kBytesPerPixel * clip_.x();
// Consume all the data in the message.
bool decompress_again = true;
int used = 0;
while (decompress_again && used < in_size) {
if (row_y_ >= clip_.height()) {
state_ = kError;
LOG(WARNING) << "Too much data is received for the given rectangle.";
return DECODE_ERROR;
}
int written = 0;
int consumed = 0;
// TODO(ajwong): This assume source and dest stride are the same, which is
// incorrect.
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;
}
}
if (state_ == kPartitionDone || state_ == kDone) {
if (row_y_ < clip_.height()) {
state_ = kError;
LOG(WARNING) << "Received LAST_PACKET, but didn't get enough data.";
return DECODE_ERROR;
}
updated_rects_.push_back(clip_);
decompressor_->Reset();
}
if (state_ == kDone) {
return DECODE_DONE;
} else {
return DECODE_IN_PROGRESS;
}
}
void DecoderRowBased::UpdateStateForPacket(const VideoPacket* packet) {
if (state_ == kError) {
return;
}
if (packet->flags() & VideoPacket::FIRST_PACKET) {
if (state_ != kReady && state_ != kDone && state_ != kPartitionDone) {
state_ = kError;
LOG(WARNING) << "Received unexpected FIRST_PACKET.";
return;
}
state_ = kProcessing;
// Reset the buffer location status variables on the first packet.
clip_.SetRect(packet->format().x(), packet->format().y(),
packet->format().width(), packet->format().height());
row_pos_ = 0;
row_y_ = 0;
}
if (state_ != kProcessing) {
state_ = kError;
LOG(WARNING) << "Received unexpected packet.";
return;
}
if (packet->flags() & VideoPacket::LAST_PACKET) {
if (state_ != kProcessing) {
state_ = kError;
LOG(WARNING) << "Received unexpected LAST_PACKET.";
return;
}
state_ = kPartitionDone;
}
if (packet->flags() & VideoPacket::LAST_PARTITION) {
if (state_ != kPartitionDone) {
state_ = kError;
LOG(WARNING) << "Received unexpected LAST_PARTITION.";
return;
}
state_ = kDone;
}
return;
}
void DecoderRowBased::GetUpdatedRects(UpdatedRects* rects) {
rects->swap(updated_rects_);
updated_rects_.clear();
}
VideoPacketFormat::Encoding DecoderRowBased::Encoding() {
return encoding_;
}
} // namespace remoting
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