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// Copyright 2015 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/host/video_frame_pump.h"
#include <algorithm>
#include "base/bind.h"
#include "base/callback.h"
#include "base/logging.h"
#include "base/memory/scoped_ptr.h"
#include "base/single_thread_task_runner.h"
#include "base/task_runner_util.h"
#include "base/time/time.h"
#include "remoting/proto/control.pb.h"
#include "remoting/proto/video.pb.h"
#include "remoting/protocol/video_stub.h"
#include "third_party/webrtc/modules/desktop_capture/desktop_frame.h"
namespace remoting {
namespace {
scoped_ptr<VideoPacket> EncodeFrame(VideoEncoder* encoder,
scoped_ptr<webrtc::DesktopFrame> frame) {
scoped_ptr<VideoPacket> packet;
// If |frame| is non-NULL then let the encoder process it.
if (frame) {
packet = encoder->Encode(*frame);
}
// If |frame| is NULL, or the encoder returned nothing, return an empty
// packet.
if (!packet) {
packet.reset(new VideoPacket());
}
return packet.Pass();
}
} // namespace
// Interval between empty keep-alive frames. These frames are sent only when the
// stream is paused or inactive for some other reason (e.g. when blocked on
// capturer). To prevent PseudoTCP from resetting congestion window this value
// must be smaller than the minimum RTO used in PseudoTCP, which is 250ms.
static const int kKeepAlivePacketIntervalMs = 200;
static bool g_enable_timestamps = false;
// static
void VideoFramePump::EnableTimestampsForTests() {
g_enable_timestamps = true;
}
VideoFramePump::VideoFramePump(
scoped_refptr<base::SingleThreadTaskRunner> encode_task_runner,
scoped_ptr<webrtc::DesktopCapturer> capturer,
scoped_ptr<VideoEncoder> encoder,
protocol::VideoStub* video_stub)
: encode_task_runner_(encode_task_runner),
capturer_(capturer.Pass()),
encoder_(encoder.Pass()),
video_stub_(video_stub),
keep_alive_timer_(
FROM_HERE,
base::TimeDelta::FromMilliseconds(kKeepAlivePacketIntervalMs),
base::Bind(&VideoFramePump::SendKeepAlivePacket,
base::Unretained(this)),
false),
capture_scheduler_(base::Bind(&VideoFramePump::CaptureNextFrame,
base::Unretained(this))),
latest_event_timestamp_(0),
weak_factory_(this) {
DCHECK(encoder_);
DCHECK(video_stub_);
capturer_->Start(this);
capture_scheduler_.Start();
}
VideoFramePump::~VideoFramePump() {
encode_task_runner_->DeleteSoon(FROM_HERE, encoder_.release());
}
void VideoFramePump::Pause(bool pause) {
DCHECK(thread_checker_.CalledOnValidThread());
capture_scheduler_.Pause(pause);
}
void VideoFramePump::SetLatestEventTimestamp(int64 latest_event_timestamp) {
DCHECK(thread_checker_.CalledOnValidThread());
latest_event_timestamp_ = latest_event_timestamp;
}
void VideoFramePump::SetLosslessEncode(bool want_lossless) {
DCHECK(thread_checker_.CalledOnValidThread());
encode_task_runner_->PostTask(
FROM_HERE, base::Bind(&VideoEncoder::SetLosslessEncode,
base::Unretained(encoder_.get()), want_lossless));
}
void VideoFramePump::SetLosslessColor(bool want_lossless) {
DCHECK(thread_checker_.CalledOnValidThread());
encode_task_runner_->PostTask(
FROM_HERE, base::Bind(&VideoEncoder::SetLosslessColor,
base::Unretained(encoder_.get()), want_lossless));
}
webrtc::SharedMemory* VideoFramePump::CreateSharedMemory(size_t size) {
DCHECK(thread_checker_.CalledOnValidThread());
return nullptr;
}
void VideoFramePump::OnCaptureCompleted(webrtc::DesktopFrame* frame) {
DCHECK(thread_checker_.CalledOnValidThread());
capture_scheduler_.OnCaptureCompleted();
// Even when |frame| is nullptr we still need to post it to the encode thread
// to make sure frames are freed in the same order they are received and
// that we don't start capturing frame n+2 before frame n is freed.
base::PostTaskAndReplyWithResult(
encode_task_runner_.get(), FROM_HERE,
base::Bind(&EncodeFrame, encoder_.get(),
base::Passed(make_scoped_ptr(frame))),
base::Bind(&VideoFramePump::SendEncodedFrame, weak_factory_.GetWeakPtr(),
latest_event_timestamp_, base::TimeTicks::Now()));
}
void VideoFramePump::CaptureNextFrame() {
DCHECK(thread_checker_.CalledOnValidThread());
capturer_->Capture(webrtc::DesktopRegion());
}
void VideoFramePump::SendEncodedFrame(int64 latest_event_timestamp,
base::TimeTicks timestamp,
scoped_ptr<VideoPacket> packet) {
DCHECK(thread_checker_.CalledOnValidThread());
if (g_enable_timestamps)
packet->set_timestamp(timestamp.ToInternalValue());
packet->set_latest_event_timestamp(latest_event_timestamp);
capture_scheduler_.OnFrameEncoded(packet.get());
video_stub_->ProcessVideoPacket(packet.Pass(),
base::Bind(&VideoFramePump::OnVideoPacketSent,
weak_factory_.GetWeakPtr()));
}
void VideoFramePump::OnVideoPacketSent() {
DCHECK(thread_checker_.CalledOnValidThread());
capture_scheduler_.OnFrameSent();
keep_alive_timer_.Reset();
}
void VideoFramePump::SendKeepAlivePacket() {
DCHECK(thread_checker_.CalledOnValidThread());
video_stub_->ProcessVideoPacket(
make_scoped_ptr(new VideoPacket()),
base::Bind(&VideoFramePump::OnKeepAlivePacketSent,
weak_factory_.GetWeakPtr()));
}
void VideoFramePump::OnKeepAlivePacketSent() {
DCHECK(thread_checker_.CalledOnValidThread());
keep_alive_timer_.Reset();
}
} // namespace remoting
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