Erster Commit

src/DeviceDialog.cpp

@@ -0,0 +1,148 @@
+#include "DeviceDialog.h"
+
+#include <QVBoxLayout>
+#include <QHBoxLayout>
+#include <QFormLayout>
+#include <QComboBox>
+#include <QLabel>
+#include <QPushButton>
+#include <QDir>
+#include <QDebug>
+
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/ioctl.h>
+#include <linux/videodev2.h>
+#include <alsa/asoundlib.h>
+#include <cerrno>
+#include <cstring>
+
+static int xioctl(int fd, unsigned long req, void* arg)
+{
+    int r;
+    do { r = ioctl(fd, req, arg); } while (r == -1 && errno == EINTR);
+    return r;
+}
+
+DeviceDialog::DeviceDialog(QWidget* parent)
+    : QDialog(parent)
+{
+    setWindowTitle("HDMI Viewer – Gerät auswählen");
+    setMinimumWidth(520);
+
+    auto* form   = new QFormLayout;
+    m_videoCombo = new QComboBox(this);
+    m_audioCombo = new QComboBox(this);
+    m_fpsCombo   = new QComboBox(this);
+
+    m_videoCombo->setSizeAdjustPolicy(QComboBox::AdjustToContents);
+    m_audioCombo->setSizeAdjustPolicy(QComboBox::AdjustToContents);
+
+    populateVideoDevices();
+    populateAudioDevices();
+
+    // FPS-Optionen: gängige Werte für HDMI-Grabber
+    for (int fps : {10, 15, 20, 24, 25, 30, 50, 60})
+        m_fpsCombo->addItem(QString::number(fps) + " fps", fps);
+    // Default: 30
+    setPreselectedFps(30);
+
+    form->addRow("Video-Gerät (V4L2):", m_videoCombo);
+    form->addRow("Audio-Gerät (ALSA):", m_audioCombo);
+    form->addRow("Ziel-Framerate:", m_fpsCombo);
+
+    auto* hint = new QLabel(
+        "<small><b>Hinweis:</b> Der Grabber liefert die gewünschte FPS-Zahl nur wenn "
+        "genug USB-Bandbreite vorhanden ist. Die tatsächliche Rate wird in der "
+        "Titelleiste angezeigt.<br>"
+        "<b>F</b> = Vollbild &nbsp;·&nbsp; <b>Esc</b> = zurück hierher</small>",
+        this);
+    hint->setWordWrap(true);
+
+    auto* btnBox   = new QHBoxLayout;
+    auto* btnOk    = new QPushButton("Starten", this);
+    auto* btnClose = new QPushButton("Beenden", this);
+    btnOk->setDefault(true);
+    btnBox->addStretch();
+    btnBox->addWidget(btnClose);
+    btnBox->addWidget(btnOk);
+
+    connect(btnOk,    &QPushButton::clicked, this, &QDialog::accept);
+    connect(btnClose, &QPushButton::clicked, this, &QDialog::reject);
+
+    auto* main = new QVBoxLayout(this);
+    main->addLayout(form);
+    main->addSpacing(8);
+    main->addWidget(hint);
+    main->addSpacing(12);
+    main->addLayout(btnBox);
+}
+
+QString DeviceDialog::selectedVideoDevice() const { return m_videoCombo->currentData().toString(); }
+QString DeviceDialog::selectedAudioDevice() const { return m_audioCombo->currentData().toString(); }
+int     DeviceDialog::selectedFps()         const { return m_fpsCombo->currentData().toInt(); }
+
+void DeviceDialog::setPreselectedVideo(const QString& device) { selectByData(m_videoCombo, device); }
+void DeviceDialog::setPreselectedAudio(const QString& device) { selectByData(m_audioCombo, device); }
+void DeviceDialog::setPreselectedFps(int fps) { selectByData(m_fpsCombo, QString::number(fps)); }
+
+void DeviceDialog::selectByData(QComboBox* combo, const QString& data)
+{
+    for (int i = 0; i < combo->count(); ++i)
+        if (combo->itemData(i).toString() == data) { combo->setCurrentIndex(i); return; }
+}
+
+void DeviceDialog::populateVideoDevices()
+{
+    QDir dev("/dev");
+    const QStringList entries = dev.entryList({"video*"}, QDir::System, QDir::Name);
+
+    for (const QString& entry : entries) {
+        const QString path = "/dev/" + entry;
+        int fd = ::open(path.toLocal8Bit().constData(), O_RDWR | O_NONBLOCK);
+        if (fd == -1) continue;
+
+        v4l2_capability cap{};
+        QString label = path;
+        if (xioctl(fd, VIDIOC_QUERYCAP, &cap) == 0) {
+            if (!(cap.capabilities & V4L2_CAP_VIDEO_CAPTURE)) { ::close(fd); continue; }
+            const QString card = QString::fromLatin1(
+                reinterpret_cast<const char*>(cap.card), 32).trimmed();
+            if (!card.isEmpty())
+                label = QString("%1  [%2]").arg(path, card);
+        }
+        ::close(fd);
+        m_videoCombo->addItem(label, path);
+    }
+
+    if (m_videoCombo->count() == 0)
+        m_videoCombo->addItem("Kein V4L2-Gerät gefunden", "");
+}
+
+void DeviceDialog::populateAudioDevices()
+{
+    m_audioCombo->addItem("default  [System-Standard]", "default");
+
+    void** hints = nullptr;
+    if (snd_device_name_hint(-1, "pcm", &hints) < 0) return;
+
+    for (void** hint = hints; *hint != nullptr; ++hint) {
+        char* ioid = snd_device_name_get_hint(*hint, "IOID");
+        const bool isCapture = (ioid == nullptr || strcmp(ioid, "Input") == 0);
+        free(ioid);
+        if (!isCapture) continue;
+
+        char* name = snd_device_name_get_hint(*hint, "NAME");
+        char* desc = snd_device_name_get_hint(*hint, "DESC");
+
+        if (name) {
+            const QString n = QString::fromLatin1(name);
+            const QString d = desc ? QString::fromLatin1(desc).replace('\n', ' ') : n;
+            if (n != "default")
+                m_audioCombo->addItem(QString("%1  [%2]").arg(n, d.left(60)), n);
+            free(name);
+        }
+        if (desc) free(desc);
+    }
+    snd_device_name_free_hint(hints);
+}