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// Copyright 2018 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 "third_party/blink/renderer/platform/mediastream/audio_service_audio_processor_proxy.h"
#include <stddef.h>
#include <stdint.h>
#include <algorithm>
#include <limits>
#include <string>
#include <utility>
#include <vector>
#include "base/single_thread_task_runner.h"
#include "base/task/post_task.h"
#include "base/timer/timer.h"
#include "build/build_config.h"
#include "third_party/blink/renderer/platform/mediastream/aec_dump_agent_impl.h"
#include "third_party/blink/renderer/platform/scheduler/public/worker_pool.h"
#include "third_party/blink/renderer/platform/wtf/cross_thread_functional.h"
#include "third_party/blink/renderer/platform/wtf/functional.h"
namespace blink {
namespace {
constexpr base::TimeDelta kMaxStatsInterval = base::TimeDelta::FromSeconds(5);
constexpr base::TimeDelta kMinStatsInterval =
base::TimeDelta::FromMilliseconds(100);
} // namespace
AudioServiceAudioProcessorProxy::AudioServiceAudioProcessorProxy(
scoped_refptr<base::SingleThreadTaskRunner> main_thread_task_runner)
: main_thread_runner_(std::move(main_thread_task_runner)),
target_stats_interval_(kMaxStatsInterval) {
DCHECK(main_thread_runner_->BelongsToCurrentThread());
}
AudioServiceAudioProcessorProxy::~AudioServiceAudioProcessorProxy() {
DCHECK(main_thread_runner_->BelongsToCurrentThread());
Stop();
}
void AudioServiceAudioProcessorProxy::Stop() {
DCHECK(main_thread_runner_->BelongsToCurrentThread());
aec_dump_agent_impl_.reset();
if (processor_controls_) {
processor_controls_->StopEchoCancellationDump();
processor_controls_ = nullptr;
}
stats_update_timer_.Stop();
}
void AudioServiceAudioProcessorProxy::OnStartDump(base::File dump_file) {
DCHECK(main_thread_runner_->BelongsToCurrentThread());
DCHECK(dump_file.IsValid());
if (processor_controls_) {
processor_controls_->StartEchoCancellationDump(std::move(dump_file));
} else {
// Post the file close to avoid blocking the main thread.
worker_pool::PostTask(
FROM_HERE, {base::TaskPriority::LOWEST, base::MayBlock()},
CrossThreadBindOnce([](base::File) {}, std::move(dump_file)));
}
}
void AudioServiceAudioProcessorProxy::OnStopDump() {
DCHECK(main_thread_runner_->BelongsToCurrentThread());
if (processor_controls_)
processor_controls_->StopEchoCancellationDump();
}
void AudioServiceAudioProcessorProxy::SetControls(
media::AudioProcessorControls* controls) {
DCHECK(main_thread_runner_->BelongsToCurrentThread());
DCHECK(!processor_controls_);
DCHECK(controls);
processor_controls_ = controls;
// Initialize the stats interval request timer with the current time ticks,
// so it makes any sort of sense.
last_stats_request_time_ = base::TimeTicks::Now();
stats_update_timer_.SetTaskRunner(main_thread_runner_);
RescheduleStatsUpdateTimer(target_stats_interval_);
// Can be null in unit tests. That's okay.
aec_dump_agent_impl_ = AecDumpAgentImpl::Create(this);
}
webrtc::AudioProcessorInterface::AudioProcessorStatistics
AudioServiceAudioProcessorProxy::GetStats(bool has_remote_tracks) {
base::AutoLock lock(stats_lock_);
// Find some reasonable update interval, rounding down to the nearest one
// tenth of a second. The update interval is chosen so that the rate of
// updates we get from the audio service is near the interval at which the
// client calls GetStats.
const auto rounded = [](base::TimeDelta d) {
return d - (d % base::TimeDelta::FromMilliseconds(100));
};
const auto now = base::TimeTicks::Now();
const auto request_interval = rounded(now - last_stats_request_time_);
target_stats_interval_ = std::max(
kMinStatsInterval, std::min(request_interval, kMaxStatsInterval));
last_stats_request_time_ = now;
// |has_remote_tracks| is ignored, since the remote AudioProcessingModule gets
// this information more directly.
return latest_stats_;
}
void AudioServiceAudioProcessorProxy::RescheduleStatsUpdateTimer(
base::TimeDelta new_interval) {
DCHECK(main_thread_runner_->BelongsToCurrentThread());
// Unretained is safe since |this| owns |stats_update_timer_|.
stats_update_timer_.Start(
FROM_HERE, new_interval,
WTF::BindRepeating(&AudioServiceAudioProcessorProxy::RequestStats,
WTF::Unretained(this)));
}
void AudioServiceAudioProcessorProxy::RequestStats() {
DCHECK(main_thread_runner_->BelongsToCurrentThread());
if (processor_controls_) {
processor_controls_->GetStats(
WTF::Bind(&AudioServiceAudioProcessorProxy::UpdateStats,
weak_ptr_factory_.GetWeakPtr()));
}
}
void AudioServiceAudioProcessorProxy::UpdateStats(
const AudioProcessorStatistics& new_stats) {
DCHECK(main_thread_runner_->BelongsToCurrentThread());
base::TimeDelta target_interval;
{
base::AutoLock lock(stats_lock_);
latest_stats_ = new_stats;
target_interval = target_stats_interval_;
}
if (target_interval != stats_update_timer_.GetCurrentDelay()) {
RescheduleStatsUpdateTimer(target_interval);
}
}
} // namespace blink
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