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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/client/rectangle_update_decoder.h"
#include "base/logging.h"
#include "base/message_loop.h"
#include "media/base/callback.h"
#include "remoting/base/decoder.h"
#include "remoting/base/decoder_row_based.h"
#include "remoting/base/decoder_vp8.h"
#include "remoting/base/tracer.h"
#include "remoting/base/util.h"
#include "remoting/client/frame_consumer.h"
using media::AutoTaskRunner;
namespace remoting {
namespace {
class PartialFrameCleanup : public Task {
public:
PartialFrameCleanup(media::VideoFrame* frame, UpdatedRects* rects)
: frame_(frame), rects_(rects) {
}
virtual void Run() {
delete rects_;
frame_ = NULL;
}
private:
scoped_refptr<media::VideoFrame> frame_;
UpdatedRects* rects_;
};
} // namespace
RectangleUpdateDecoder::RectangleUpdateDecoder(MessageLoop* message_loop,
FrameConsumer* consumer)
: message_loop_(message_loop),
consumer_(consumer) {
}
RectangleUpdateDecoder::~RectangleUpdateDecoder() {
}
void RectangleUpdateDecoder::DecodePacket(const VideoPacket& packet,
Task* done) {
if (message_loop_ != MessageLoop::current()) {
message_loop_->PostTask(
FROM_HERE,
NewTracedMethod(this,
&RectangleUpdateDecoder::DecodePacket, packet,
done));
return;
}
AutoTaskRunner done_runner(done);
TraceContext::tracer()->PrintString("Decode Packet called.");
if (!IsValidPacket(packet)) {
LOG(ERROR) << "Received invalid packet.";
return;
}
Task* process_packet_data =
NewTracedMethod(this,
&RectangleUpdateDecoder::ProcessPacketData,
packet, done_runner.release());
if (packet.flags() | VideoPacket::FIRST_PACKET) {
const VideoPacketFormat& format = packet.format();
InitializeDecoder(format, process_packet_data);
} else {
process_packet_data->Run();
delete process_packet_data;
}
}
void RectangleUpdateDecoder::ProcessPacketData(
const VideoPacket& packet, Task* done) {
AutoTaskRunner done_runner(done);
if (!decoder_->IsReadyForData()) {
// TODO(ajwong): This whole thing should move into an invalid state.
LOG(ERROR) << "Decoder is unable to process data. Dropping packet.";
return;
}
TraceContext::tracer()->PrintString("Executing Decode.");
decoder_->DecodeBytes(packet.data());
if (packet.flags() | VideoPacket::LAST_PACKET) {
decoder_->Reset();
UpdatedRects* rects = new UpdatedRects();
// Empty out the list of current updated rects so the decoder can keep
// writing new ones while these are processed.
rects->swap(updated_rects_);
consumer_->OnPartialFrameOutput(frame_, rects,
new PartialFrameCleanup(frame_, rects));
}
}
// static
bool RectangleUpdateDecoder::IsValidPacket(const VideoPacket& packet) {
if (!packet.IsInitialized()) {
LOG(WARNING) << "Protobuf consistency checks fail.";
return false;
}
// First packet must have a format.
if (packet.flags() | VideoPacket::FIRST_PACKET) {
if (!packet.has_format()) {
LOG(WARNING) << "First packet must have format.";
return false;
}
// TODO(ajwong): Verify that we don't need to whitelist encodings.
const VideoPacketFormat& format = packet.format();
if (!format.has_encoding() ||
format.encoding() == VideoPacketFormat::ENCODING_INVALID) {
LOG(WARNING) << "Invalid encoding specified.";
return false;
}
}
// We shouldn't generate null packets.
if (!packet.has_data()) {
LOG(WARNING) << "Packet w/o data received.";
return false;
}
return true;
}
void RectangleUpdateDecoder::InitializeDecoder(const VideoPacketFormat& format,
Task* done) {
if (message_loop_ != MessageLoop::current()) {
message_loop_->PostTask(
FROM_HERE,
NewTracedMethod(this,
&RectangleUpdateDecoder::InitializeDecoder,
format, done));
return;
}
AutoTaskRunner done_runner(done);
// Check if we need to request a new frame.
if (!frame_ ||
frame_->width() < static_cast<size_t>(format.width()) ||
frame_->height() < static_cast<size_t>(format.height())) {
if (frame_) {
TraceContext::tracer()->PrintString("Releasing old frame.");
consumer_->ReleaseFrame(frame_);
frame_ = NULL;
}
TraceContext::tracer()->PrintString("Requesting new frame.");
consumer_->AllocateFrame(media::VideoFrame::RGB32,
format.width(), format.height(),
base::TimeDelta(), base::TimeDelta(),
&frame_,
NewTracedMethod(
this,
&RectangleUpdateDecoder::InitializeDecoder,
format,
done_runner.release()));
return;
}
// TODO(ajwong): We need to handle the allocator failing to create a frame
// and properly disable this class.
CHECK(frame_);
if (decoder_.get()) {
// TODO(ajwong): We need to handle changing decoders midstream correctly
// since someone may feed us a corrupt stream, or manually create a
// stream that changes decoders. At the very leask, we should not
// crash the process.
//
// For now though, assume that only one encoding is used throughout.
//
// Note, this may be as simple as just deleting the current decoder.
// However, we need to verify the flushing semantics of the decoder first.
CHECK(decoder_->Encoding() == format.encoding());
} else {
// Initialize a new decoder based on this message encoding.
if (format.encoding() == VideoPacketFormat::ENCODING_VERBATIM) {
TraceContext::tracer()->PrintString("Creating Verbatim decoder.");
decoder_.reset(DecoderRowBased::CreateVerbatimDecoder());
} else if (format.encoding() == VideoPacketFormat::ENCODING_ZLIB) {
TraceContext::tracer()->PrintString("Creating Zlib decoder");
decoder_.reset(DecoderRowBased::CreateZlibDecoder());
} else if (format.encoding() == VideoPacketFormat::ENCODING_VP8) {
TraceContext::tracer()->PrintString("Creating VP8 decoder");
decoder_.reset(new DecoderVp8());
} else {
NOTREACHED() << "Invalid Encoding found: " << format.encoding();
}
}
// TODO(ajwong): This can happen in the face of corrupt input data. Figure
// out the right behavior and make this more resilient.
CHECK(updated_rects_.empty());
gfx::Rect rectangle_size(format.x(), format.y(),
format.width(), format.height());
updated_rects_.push_back(rectangle_size);
decoder_->Initialize(frame_, rectangle_size,
GetBytesPerPixel(format.pixel_format()));
TraceContext::tracer()->PrintString("Decoder is Initialized");
}
} // namespace remoting
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