AudioOutputElement.cpp

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// Copyright 2015 - 2026, GIBIS-UNIFESP and the wiRedPanda contributors
// SPDX-License-Identifier: GPL-3.0-or-later
 
#include "App/Element/GraphicElements/AudioOutputElement.h"
 
#include <QAudioDevice>
#include <QMediaDevices>
 
#include "App/Wiring/Port.h"
 
AudioOutputElement::AudioOutputElement(ElementType type, QGraphicsItem *parent, float initialVolume)
    : GraphicElement(type, parent)
    , m_volume(initialVolume)
{
    // Position label to the right of the 64×64 body, vertically centred
    setLabelAnchor(QPointF(64, 34));
 
    // Detect audio hardware once per process; subsequent calls are guarded by
    // m_hasOutputDevice so the element works silently in headless/CI environments.
    static const bool hasOutputDevice = !QMediaDevices::defaultAudioOutput().description().isEmpty();
    m_hasOutputDevice = hasOutputDevice;
}
 
void AudioOutputElement::refresh()
{
    if (!isValid()) {
        stop();
        return;
    }
 
    const Status inputValue = inputs().constFirst()->status();
 
    (inputValue == Status::Active) ? play() : stop();
}
 
bool AudioOutputElement::isPlaying() const
{
    return m_isPlaying;
}
 
bool AudioOutputElement::isMuted() const
{
    return m_muted;
}
 
float AudioOutputElement::volume() const
{
    return m_volume;
}
 
void AudioOutputElement::mute(const bool mute)
{
    m_muted = mute;
    if (!m_hasOutputDevice) {
        return;
    }
    applyMute();
}
 
void AudioOutputElement::setVolume(float vol)
{
    m_volume = vol;
    if (m_hasOutputDevice) {
        applyVolume();
    }
}
 
void AudioOutputElement::play()
{
    if (m_isPlaying) {
        return;
    }
 
    setPixmap(1);
 
    if (m_hasOutputDevice) {
        startAudio();
    }
 
    m_isPlaying = true;
}
 
void AudioOutputElement::stop()
{
    if (!m_isPlaying) {
        return;
    }
 
    setPixmap(0);
 
    if (m_hasOutputDevice) {
        stopAudio();
    }
 
    m_isPlaying = false;
}