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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/audio_pump.h"
#include <utility>
#include "base/bind.h"
#include "base/location.h"
#include "base/logging.h"
#include "base/macros.h"
#include "base/single_thread_task_runner.h"
#include "base/thread_task_runner_handle.h"
#include "remoting/codec/audio_encoder.h"
#include "remoting/host/audio_capturer.h"
#include "remoting/proto/audio.pb.h"
#include "remoting/protocol/audio_stub.h"
namespace remoting {
// Limit the data stored in the pending send buffers to 250ms.
const int kMaxBufferedIntervalMs = 250;
class AudioPump::Core {
public:
Core(base::WeakPtr<AudioPump> pump,
scoped_ptr<AudioCapturer> audio_capturer,
scoped_ptr<AudioEncoder> audio_encoder);
~Core();
void Start();
void Pause(bool pause);
void OnPacketSent(int size);
private:
void EncodeAudioPacket(scoped_ptr<AudioPacket> packet);
base::ThreadChecker thread_checker_;
base::WeakPtr<AudioPump> pump_;
scoped_refptr<base::SingleThreadTaskRunner> pump_task_runner_;
scoped_ptr<AudioCapturer> audio_capturer_;
scoped_ptr<AudioEncoder> audio_encoder_;
bool enabled_;
// Number of bytes in the queue that have been encoded but haven't been sent
// yet.
int bytes_pending_;
DISALLOW_COPY_AND_ASSIGN(Core);
};
AudioPump::Core::Core(base::WeakPtr<AudioPump> pump,
scoped_ptr<AudioCapturer> audio_capturer,
scoped_ptr<AudioEncoder> audio_encoder)
: pump_(pump),
pump_task_runner_(base::ThreadTaskRunnerHandle::Get()),
audio_capturer_(std::move(audio_capturer)),
audio_encoder_(std::move(audio_encoder)),
enabled_(true),
bytes_pending_(0) {
thread_checker_.DetachFromThread();
}
AudioPump::Core::~Core() {
DCHECK(thread_checker_.CalledOnValidThread());
}
void AudioPump::Core::Start() {
DCHECK(thread_checker_.CalledOnValidThread());
audio_capturer_->Start(
base::Bind(&Core::EncodeAudioPacket, base::Unretained(this)));
}
void AudioPump::Core::Pause(bool pause) {
DCHECK(thread_checker_.CalledOnValidThread());
enabled_ = !pause;
}
void AudioPump::Core::OnPacketSent(int size) {
DCHECK(thread_checker_.CalledOnValidThread());
bytes_pending_-= size;
DCHECK_GE(bytes_pending_, 0);
}
void AudioPump::Core::EncodeAudioPacket(scoped_ptr<AudioPacket> packet) {
DCHECK(thread_checker_.CalledOnValidThread());
DCHECK(packet);
int max_buffered_bytes =
audio_encoder_->GetBitrate() * kMaxBufferedIntervalMs / 1000 / 8;
if (!enabled_ || bytes_pending_ > max_buffered_bytes)
return;
scoped_ptr<AudioPacket> encoded_packet =
audio_encoder_->Encode(std::move(packet));
// The audio encoder returns a null audio packet if there's no audio to send.
if (!encoded_packet)
return;
int packet_size = encoded_packet->ByteSize();
bytes_pending_ += packet_size;
pump_task_runner_->PostTask(
FROM_HERE, base::Bind(&AudioPump::SendAudioPacket, pump_,
base::Passed(&encoded_packet), packet_size));
}
AudioPump::AudioPump(
scoped_refptr<base::SingleThreadTaskRunner> audio_task_runner,
scoped_ptr<AudioCapturer> audio_capturer,
scoped_ptr<AudioEncoder> audio_encoder,
protocol::AudioStub* audio_stub)
: audio_task_runner_(audio_task_runner),
audio_stub_(audio_stub),
weak_factory_(this) {
DCHECK(audio_stub_);
core_.reset(new Core(weak_factory_.GetWeakPtr(), std::move(audio_capturer),
std::move(audio_encoder)));
audio_task_runner_->PostTask(
FROM_HERE, base::Bind(&Core::Start, base::Unretained(core_.get())));
}
AudioPump::~AudioPump() {
DCHECK(thread_checker_.CalledOnValidThread());
audio_task_runner_->DeleteSoon(FROM_HERE, core_.release());
}
void AudioPump::Pause(bool pause) {
DCHECK(thread_checker_.CalledOnValidThread());
audio_task_runner_->PostTask(
FROM_HERE,
base::Bind(&Core::Pause, base::Unretained(core_.get()), pause));
}
void AudioPump::SendAudioPacket(scoped_ptr<AudioPacket> packet, int size) {
DCHECK(thread_checker_.CalledOnValidThread());
DCHECK(packet);
audio_stub_->ProcessAudioPacket(
std::move(packet),
base::Bind(&AudioPump::OnPacketSent, weak_factory_.GetWeakPtr(), size));
}
void AudioPump::OnPacketSent(int size) {
audio_task_runner_->PostTask(
FROM_HERE,
base::Bind(&Core::OnPacketSent, base::Unretained(core_.get()), size));
}
} // namespace remoting
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