chromium/chrome/browser/ui/views/media_preview/mic_preview/audio_stream_coordinator.cc

// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/40285824): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif

#include "chrome/browser/ui/views/media_preview/mic_preview/audio_stream_coordinator.h"

#include <memory>

#include "base/task/bind_post_task.h"
#include "chrome/browser/ui/views/media_preview/mic_preview/audio_stream_view.h"

namespace {

// Maximum acceptable audio value.
constexpr float kMaxAudioValue = …;
// Number of audio buffers to receive per second.
constexpr int kNumberOfBuffersPerSecond = …;
// A multiplier used to scale up audio values.
constexpr float kAudioValueScaler = …;
// The number of values considered while computing the average.
// This value is based on kRolledAverageWindow of 0.2 second.
// Computed as `kNumberOfBuffersPerSecond` * `kRolledAverageWindow`.
constexpr int kRolledAverageSize = …;

float GetRolledAverageValue(float current_audio_value,
                            float previous_audio_level) { … }

}  // namespace

AudioStreamCoordinator::AudioStreamCoordinator(views::View& parent_view) { … }

AudioStreamCoordinator::~AudioStreamCoordinator() { … }

void AudioStreamCoordinator::ConnectToDevice(
    mojo::PendingRemote<media::mojom::AudioStreamFactory> audio_stream_factory,
    const std::string& device_id,
    int sample_rate) { … }

void AudioStreamCoordinator::OnAudioCaptured(
    std::unique_ptr<media::AudioBus> audio_bus,
    base::TimeTicks capture_time) { … }

void AudioStreamCoordinator::Stop() { … }

AudioStreamView* AudioStreamCoordinator::GetAudioStreamView() { … }