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// Copyright (c) 2012 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.
#ifndef REMOTING_CLIENT_RECTANGLE_UPDATE_DECODER_H_
#define REMOTING_CLIENT_RECTANGLE_UPDATE_DECODER_H_
#include <list>
#include "base/callback_forward.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "remoting/codec/video_decoder.h"
#include "remoting/client/chromoting_stats.h"
#include "remoting/client/frame_consumer_proxy.h"
#include "remoting/client/frame_producer.h"
#include "remoting/protocol/video_stub.h"
#include "third_party/webrtc/modules/desktop_capture/desktop_geometry.h"
namespace base {
class SingleThreadTaskRunner;
} // namespace base
namespace remoting {
class ChromotingStats;
namespace protocol {
class SessionConfig;
} // namespace protocol
// TODO(ajwong): Re-examine this API, especially with regards to how error
// conditions on each step are reported. Should they be CHECKs? Logs? Other?
// TODO(sergeyu): Rename this class.
class RectangleUpdateDecoder
: public base::RefCountedThreadSafe<RectangleUpdateDecoder>,
public FrameProducer,
public protocol::VideoStub {
public:
// Creates an update decoder on |main_task_runner_| and |decode_task_runner_|,
// outputting to |consumer|. The |main_task_runner_| is responsible for
// receiving and queueing packets. The |decode_task_runner_| is responsible
// for decoding the video packets.
// TODO(wez): Replace the ref-counted proxy with an owned FrameConsumer.
RectangleUpdateDecoder(
scoped_refptr<base::SingleThreadTaskRunner> main_task_runner,
scoped_refptr<base::SingleThreadTaskRunner> decode_task_runner,
scoped_refptr<FrameConsumerProxy> consumer);
// Initializes decoder with the information from the protocol config.
void Initialize(const protocol::SessionConfig& config);
// FrameProducer implementation. These methods may be called before we are
// Initialize()d, or we know the source screen size.
virtual void DrawBuffer(webrtc::DesktopFrame* buffer) OVERRIDE;
virtual void InvalidateRegion(const webrtc::DesktopRegion& region) OVERRIDE;
virtual void RequestReturnBuffers(const base::Closure& done) OVERRIDE;
virtual void SetOutputSizeAndClip(
const webrtc::DesktopSize& view_size,
const webrtc::DesktopRect& clip_area) OVERRIDE;
virtual const webrtc::DesktopRegion* GetBufferShape() OVERRIDE;
// VideoStub implementation.
virtual void ProcessVideoPacket(scoped_ptr<VideoPacket> packet,
const base::Closure& done) OVERRIDE;
// Return the stats recorded by this client.
ChromotingStats* GetStats();
private:
friend class base::RefCountedThreadSafe<RectangleUpdateDecoder>;
virtual ~RectangleUpdateDecoder();
// Paints the invalidated region to the next available buffer and returns it
// to the consumer.
void SchedulePaint();
void DoPaint();
// Decodes the contents of |packet|. DecodePacket may keep a reference to
// |packet| so the |packet| must remain alive and valid until |done| is
// executed.
void DecodePacket(scoped_ptr<VideoPacket> packet, const base::Closure& done);
// Callback method when a VideoPacket is processed. |decode_start| contains
// the timestamp when the packet will start to be processed.
void OnPacketDone(base::Time decode_start, const base::Closure& done);
scoped_refptr<base::SingleThreadTaskRunner> main_task_runner_;
scoped_refptr<base::SingleThreadTaskRunner> decode_task_runner_;
scoped_refptr<FrameConsumerProxy> consumer_;
scoped_ptr<VideoDecoder> decoder_;
// Remote screen size in pixels.
webrtc::DesktopSize source_size_;
// Vertical and horizontal DPI of the remote screen.
webrtc::DesktopVector source_dpi_;
// The current dimensions of the frame consumer view.
webrtc::DesktopSize view_size_;
webrtc::DesktopRect clip_area_;
// The drawing buffers supplied by the frame consumer.
std::list<webrtc::DesktopFrame*> buffers_;
// Flag used to coalesce runs of SchedulePaint()s into a single DoPaint().
bool paint_scheduled_;
ChromotingStats stats_;
// Keep track of the most recent sequence number bounced back from the host.
int64 latest_sequence_number_;
};
} // namespace remoting
#endif // REMOTING_CLIENT_RECTANGLE_UPDATE_DECODER_H_
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