AudioSoundIo.h

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/*
 * AudioSoundIo.h - device-class that performs PCM-output via libsoundio
 *
 * Copyright (c) 2015 Andrew Kelley <superjoe30@gmail.com>
 *
 * This file is part of LMMS - https://lmms.io
 *
 * 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 2 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 (see COPYING); if not, write to the
 * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301 USA.
 *
 */
 
#ifndef LMMS_AUDIO_SOUNDIO_H
#define LMMS_AUDIO_SOUNDIO_H
 
 
#include "lmmsconfig.h"
#include "ComboBoxModel.h"  // IWYU pragma: keep
 
#ifdef LMMS_HAVE_SOUNDIO
 
#include <soundio/soundio.h>
 
#include "AudioDevice.h"
#include "AudioDeviceSetupWidget.h"
 
namespace lmms
{
 
namespace gui
{
class ComboBox;
class LcdSpinBox;
}
 
// Exists only to work around "Error: Meta object features not supported for nested classes"
class AudioSoundIoSetupUtil : public QObject
{
        Q_OBJECT
public:
        virtual ~AudioSoundIoSetupUtil() = default;
 
        void *m_setupWidget;
public slots:
        void updateDevices();
        void reconnectSoundIo();
};
 
class AudioSoundIo : public AudioDevice
{
public:
        AudioSoundIo( bool & _success_ful, AudioEngine* audioEngine );
        virtual ~AudioSoundIo();
 
        inline static QString name()
        {
                return QT_TRANSLATE_NOOP( "AudioDeviceSetupWidget", "soundio" );
        }
 
        class setupWidget : public gui::AudioDeviceSetupWidget
        {
        public:
                setupWidget( QWidget * _parent );
                virtual ~setupWidget();
 
                virtual void saveSettings();
 
                void updateDevices();
                void reconnectSoundIo();
 
        private:
 
                AudioSoundIoSetupUtil m_setupUtil;
                gui::ComboBox * m_backend;
                gui::ComboBox * m_device;
 
                ComboBoxModel m_backendModel;
                ComboBoxModel m_deviceModel;
 
                SoundIo * m_soundio;
 
                struct DeviceId {
                        QString id;
                        bool is_raw;
                };
                QList<DeviceId> m_deviceList;
 
                int m_defaultOutIndex;
                bool m_isFirst;
 
        } ;
 
private:
        void startProcessingImpl() override;
        void stopProcessingImpl() override;
 
        SoundIo *m_soundio;
        SoundIoOutStream *m_outstream;
 
        bool m_stopped;
        bool m_outstreamStarted;
 
        int m_disconnectErr;
        void onBackendDisconnect(int err);
 
        void writeCallback(int frame_count_min, int frame_count_max);
        void errorCallback(int err);
        void underflowCallback();
 
        static void staticWriteCallback(SoundIoOutStream *outstream, int frame_count_min, int frame_count_max) {
                return ((AudioSoundIo *)outstream->userdata)->writeCallback(frame_count_min, frame_count_max);
        }
        static void staticErrorCallback(SoundIoOutStream *outstream, int err) {
                return ((AudioSoundIo *)outstream->userdata)->errorCallback(err);
        }
        static void staticUnderflowCallback(SoundIoOutStream *outstream) {
                return ((AudioSoundIo *)outstream->userdata)->underflowCallback();
        }
        static void staticOnBackendDisconnect(SoundIo *soundio, int err) {
                return ((AudioSoundIo *)soundio->userdata)->onBackendDisconnect(err);
        }
 
};
 
 
} // namespace lmms
 
#endif // LMMS_HAVE_SOUNDIO
 
#endif // LMMS_AUDIO_SOUNDIO_H