implemented rolling edit (#74)

2018-07-08 14:38:40 +01:00
parent 0b739fcb76
commit 4b29e19a3e
8 changed files with 195 additions and 50 deletions
@@ -0,0 +1,63 @@
+#include "audiomonitor.h"
+
+#include "project/sequence.h"
+#include "playback/audio.h"
+#include "panels/panels.h"
+#include "panels/timeline.h"
+
+#include <QPainter>
+#include <QLinearGradient>
+#include <QtMath>
+#include <QDebug>
+
+#define AUDIO_MONITOR_GAP 3
+
+extern "C" {
+#include "libavformat/avformat.h"
+}
+
+AudioMonitor::AudioMonitor(QWidget *parent) : QWidget(parent) {
+}
+
+void AudioMonitor::reset() {
+    sample_cache_offset = -1;
+    sample_cache.clear();
+}
+
+void AudioMonitor::resizeEvent(QResizeEvent *e) {
+    gradient = QLinearGradient(QPoint(0, rect().top()), QPoint(0, rect().bottom()));
+    gradient.setColorAt(0, Qt::red);
+    gradient.setColorAt(0.25, Qt::yellow);
+    gradient.setColorAt(1, Qt::green);
+    QWidget::resizeEvent(e);
+}
+
+void AudioMonitor::paintEvent(QPaintEvent *) {
+    if (sequence != NULL) {
+        QPainter p(this);
+        int channel_x = AUDIO_MONITOR_GAP;
+        int channel_count = av_get_channel_layout_nb_channels(sequence->audio_layout);
+        int channel_width = (width()/channel_count) - AUDIO_MONITOR_GAP;
+//        for (int i=0;i<channel_count;i++) {
+        for (int i=0;i<1;i++) {
+            QRect r(channel_x, 0, channel_width, height());
+            p.fillRect(r, gradient);
+
+            if (sample_cache_offset != -1) {
+                long playhead_offset = panel_timeline->playhead - sample_cache_offset;
+                if (playhead_offset >= 0 && playhead_offset < sample_cache.size()) {
+                    //int channel_offset = i*2;
+                    double multiplier = 1 - qAbs((double) sample_cache.at(playhead_offset) / 32768.0); // 16-bit int divided to float
+                    r.setHeight(r.height()*multiplier);
+                    sample_cache_offset++;
+                    sample_cache.removeFirst();
+                } else {
+                    reset();
+                }
+            }
+
+            p.fillRect(r, QColor(0, 0, 0, 160));
+            channel_x += channel_width + AUDIO_MONITOR_GAP;
+        }
+    }
+}