add: Audio Info in NowPlayingPanel.cpp ; Includes: Samplerate, bits/sample, and codec

change: opengl dll for windows now is not included, cause it is too large
refactor: Spectrogram colors for bars are now in a Header (GradientPresetHeader.h), with accompaning methods

src/gui/NowPlayingPanel.cpp

@@ -60,11 +60,22 @@ void NowPlayingPanel::buildLayout()
     transport->addWidget(new QLabel("Volume:"));
     transport->addWidget(m_volSlider);
 
+    auto *metaRow = new QHBoxLayout;
+    metaRow->setSpacing(8);
+    metaRow->addWidget(new QLabel("Sample rate:"));
+    metaRow->addWidget(m_lblSampleRate);
+    metaRow->addWidget(new QLabel("Bits/Sample:"));
+    metaRow->addWidget(m_lblBitsPerSample);
+    metaRow->addWidget(new QLabel("Codec:"));
+    metaRow->addWidget(m_lblCodec);
+    metaRow->addStretch();
+
     auto *right = new QVBoxLayout;
     right->setSpacing(4);
     right->addWidget(m_lblTitle);
     right->addWidget(m_lblArtist);
     right->addWidget(m_lblAlbum);
+    right->addLayout(metaRow);
     right->addLayout(seekRow);
     right->addLayout(transport);
 
@@ -73,14 +84,25 @@ void NowPlayingPanel::buildLayout()
     hlay->addLayout(right, 1);
 }
 
+void NowPlayingPanel::clearAudioInfo()
+{
+    m_lblSampleRate->setText("-");
+    m_lblBitsPerSample->setText("-");
+    m_lblCodec->setText("-");
+}
+
 void NowPlayingPanel::updateTrack(const engine::Track *t)
 {
-    if (!t) return;
+    if (!t) {
+        clearAudioInfo();
+        return;
+    }
     m_cover->setTrack(t);
     m_lblTitle->setText(t->displayTitle());
     m_lblArtist->setText(t->artist);
     m_lblAlbum->setText(t->album +
         (t->year > 0 ? "  (" + QString::number(t->year) + ")" : ""));
+    clearAudioInfo();
     m_seekBar->setValue(0);
     m_btnPlay->setText("Pause");
 }
@@ -101,6 +123,13 @@ void NowPlayingPanel::updatePosition(qint64 posFrames, qint64 totalFrames, float
         m_seekBar->setValue(int(posFrames * 1000 / totalFrames));
 }
 
+void NowPlayingPanel::updateAudioInfo(int sampleRate, int bitsPerSample, const QString &codec)
+{
+    m_lblSampleRate->setText(sampleRate > 0 ? QString("%1 Hz").arg(sampleRate) : "-");
+    m_lblBitsPerSample->setText(bitsPerSample > 0 ? QString("%1").arg(bitsPerSample) : "-");
+    m_lblCodec->setText(!codec.isEmpty() ? codec : "-");
+}
+
 void NowPlayingPanel::setPlaybackActive(bool playing)
 {
     m_btnPlay->setText(playing ? "Pause" : "Play");