audio preferences

app/audio/CMakeLists.txt

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+# Olive - Non-Linear Video Editor
+# Copyright (C) 2019 Olive Team
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+set(OLIVE_SOURCES
+  ${OLIVE_SOURCES}
+  audio/audiomanager.h
+  audio/audiomanager.cpp
+  PARENT_SCOPE
+)

app/audio/audiomanager.cpp

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+/***
+
+  Olive - Non-Linear Video Editor
+  Copyright (C) 2019 Olive Team
+
+  This program is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+***/
+
+#include "audiomanager.h"
+
+AudioManager* AudioManager::audio_ = nullptr;
+
+void AudioManager::CreateInstance()
+{
+  if (audio_ == nullptr) {
+    audio_ = new AudioManager();
+  }
+}
+
+void AudioManager::DestroyInstance()
+{
+  delete audio_;
+  audio_ = nullptr;
+}
+
+AudioManager *AudioManager::instance()
+{
+  return audio_;
+}
+
+void AudioManager::RefreshDevices()
+{
+  if (refreshing_devices_) {
+    return;
+  }
+
+  input_devices_.clear();
+  output_devices_.clear();
+
+  refreshing_devices_ = true;
+
+  refresh_thread_.start(QThread::LowPriority);
+}
+
+bool AudioManager::IsRefreshing()
+{
+  return refreshing_devices_;
+}
+
+const QList<QAudioDeviceInfo> &AudioManager::ListInputDevices()
+{
+  return input_devices_;
+}
+
+const QList<QAudioDeviceInfo> &AudioManager::ListOutputDevices()
+{
+  return output_devices_;
+}
+
+AudioManager::AudioManager() :
+  output_(nullptr),
+  refreshing_devices_(false)
+{
+  RefreshDevices();
+
+  connect(&refresh_thread_, SIGNAL(ListsReady()), this, SLOT(RefreshThreadDone()));
+}
+
+void AudioManager::RefreshThreadDone()
+{
+  output_devices_ = refresh_thread_.output_devices();
+  input_devices_ = refresh_thread_.input_devices();
+
+  refreshing_devices_ = false;
+
+  emit DeviceListReady();
+}
+
+AudioRefreshDevicesThread::AudioRefreshDevicesThread()
+{
+}
+
+void AudioRefreshDevicesThread::run()
+{
+  output_devices_ = QAudioDeviceInfo::availableDevices(QAudio::AudioOutput);
+  input_devices_ = QAudioDeviceInfo::availableDevices(QAudio::AudioInput);
+
+  emit ListsReady();
+}
+
+const QList<QAudioDeviceInfo>& AudioRefreshDevicesThread::input_devices()
+{
+  return input_devices_;
+}
+
+const QList<QAudioDeviceInfo>& AudioRefreshDevicesThread::output_devices()
+{
+  return output_devices_;
+}

app/audio/audiomanager.h

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+/***
+
+  Olive - Non-Linear Video Editor
+  Copyright (C) 2019 Olive Team
+
+  This program is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+***/
+
+#ifndef AUDIOMANAGER_H
+#define AUDIOMANAGER_H
+
+#include <memory>
+#include <QAudioOutput>
+#include <QThread>
+
+/**
+ * @brief A thread for refreshing the total list of devices on the system
+ *
+ * Refreshing devices causes a noticeable pause in execution. Doing it another thread is intended to avoid this.
+ */
+class AudioRefreshDevicesThread : public QThread {
+  Q_OBJECT
+public:
+  AudioRefreshDevicesThread();
+
+  virtual void run() override;
+
+  const QList<QAudioDeviceInfo>& input_devices();
+  const QList<QAudioDeviceInfo>& output_devices();
+
+signals:
+  void ListsReady();
+
+private:
+  QList<QAudioDeviceInfo> input_devices_;
+  QList<QAudioDeviceInfo> output_devices_;
+};
+
+class AudioManager : public QObject
+{
+  Q_OBJECT
+public:
+  static void CreateInstance();
+  static void DestroyInstance();
+
+  static AudioManager* instance();
+
+  void RefreshDevices();
+
+  bool IsRefreshing();
+
+  const QList<QAudioDeviceInfo>& ListInputDevices();
+  const QList<QAudioDeviceInfo>& ListOutputDevices();
+
+signals:
+  void DeviceListReady();
+
+private:
+  AudioManager();
+
+  QList<QAudioDeviceInfo> input_devices_;
+
+  QList<QAudioDeviceInfo> output_devices_;
+
+  static AudioManager* audio_;
+
+  std::unique_ptr<QAudioOutput> output_;
+
+  bool refreshing_devices_;
+
+  AudioRefreshDevicesThread refresh_thread_;
+
+private slots:
+  void RefreshThreadDone();
+
+};
+
+#endif // AUDIOMANAGER_H