AudioPortAudio.h

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/*
 * AudioPortAudio.h - device-class that performs PCM-output via PortAudio
 *
 * Copyright (c) 2008 Csaba Hruska <csaba.hruska/at/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_PORTAUDIO_H
#define LMMS_AUDIO_PORTAUDIO_H
 
#include "lmmsconfig.h"
 
#ifdef LMMS_HAVE_PORTAUDIO
 
#include <QComboBox>
#include <QFormLayout>
#include <QString>
#include <QWidget>
#include <portaudio.h>
 
#include "AudioDevice.h"
#include "AudioDeviceSetupWidget.h"
 
namespace lmms {
 
namespace detail {
class PortAudioInitializationGuard
{
public:
        PortAudioInitializationGuard()
                : m_error(Pa_Initialize())
        {
                if (m_error != paNoError) { throw std::runtime_error{"PortAudio: could not initialize"}; }
        }
 
        ~PortAudioInitializationGuard()
        {
                if (m_error == paNoError) { Pa_Terminate(); }
        }
 
        PortAudioInitializationGuard(const PortAudioInitializationGuard&) = delete;
        PortAudioInitializationGuard(PortAudioInitializationGuard&&) = delete;
        PortAudioInitializationGuard& operator=(const PortAudioInitializationGuard&) = delete;
        PortAudioInitializationGuard& operator=(PortAudioInitializationGuard&&) = delete;
 
private:
        PaError m_error = paNoError;
};
} // namespace detail
 
class AudioPortAudio : public AudioDevice
{
public:
        AudioPortAudio(bool& successful, AudioEngine* engine);
        ~AudioPortAudio() override;
 
        AudioPortAudio(const AudioPortAudio&) = delete;
        AudioPortAudio(AudioPortAudio&&) = delete;
        AudioPortAudio& operator=(const AudioPortAudio&) = delete;
        AudioPortAudio& operator=(AudioPortAudio&&) = delete;
 
        void startProcessing() override;
        void stopProcessing() override;
 
        static auto name() -> QString { return QT_TRANSLATE_NOOP("AudioDeviceSetupWidget", "PortAudio"); }
 
private:
        static int processCallback(const void* input, void* output, unsigned long frameCount,
                const PaStreamCallbackTimeInfo* timeInfo, PaStreamCallbackFlags statusFlags, void* userData);
 
        detail::PortAudioInitializationGuard m_initGuard;
 
        PaStream* m_paStream = nullptr;
        std::vector<SampleFrame> m_outBuf;
        std::size_t m_outBufPos = 0;
};
} // namespace lmms
 
namespace lmms::gui {
class AudioPortAudioSetupWidget : public AudioDeviceSetupWidget
{
public:
        AudioPortAudioSetupWidget(QWidget* parent);
 
        void show() override;
        void saveSettings() override;
 
private:
        class DeviceSelectorWidget;
        QComboBox* m_backendComboBox = nullptr;
        DeviceSelectorWidget* m_inputDevice = nullptr;
        DeviceSelectorWidget* m_outputDevice = nullptr;
};
} // namespace lmms::gui
 
#endif // LMMS_HAVE_PORTAUDIO
 
#endif // LMMS_AUDIO_PORTAUDIO_H