1 files changed, 132 insertions, 0 deletions
diff --git a/subsonic-android/src/net/sourceforge/subsonic/androidapp/view/VisualizerView.java b/subsonic-android/src/net/sourceforge/subsonic/androidapp/view/VisualizerView.java
new file mode 100644
index 00000000..76a45253
--- /dev/null
+++ b/subsonic-android/src/net/sourceforge/subsonic/androidapp/view/VisualizerView.java
@@ -0,0 +1,132 @@
+/*
+ This file is part of Subsonic.
+
+ Subsonic 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 3 of the License, or
+ (at your option) any later version.
+
+ Subsonic 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 Subsonic.  If not, see <http://www.gnu.org/licenses/>.
+
+ Copyright 2011 (C) Sindre Mehus
+ */
+package net.sourceforge.subsonic.androidapp.view;
+
+import android.content.Context;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.Paint;
+import android.media.audiofx.Visualizer;
+import android.util.AttributeSet;
+import android.view.View;
+import net.sourceforge.subsonic.androidapp.audiofx.VisualizerController;
+import net.sourceforge.subsonic.androidapp.domain.PlayerState;
+import net.sourceforge.subsonic.androidapp.service.DownloadService;
+import net.sourceforge.subsonic.androidapp.service.DownloadServiceImpl;
+
+/**
+ * A simple class that draws waveform data received from a
+ * {@link Visualizer.OnDataCaptureListener#onWaveFormDataCapture}
+ *
+ * @author Sindre Mehus
+ * @version $Id$
+ */
+public class VisualizerView extends View {
+
+    private static final int PREFERRED_CAPTURE_RATE_MILLIHERTZ = 20000;
+
+    private final Paint paint = new Paint();
+
+    private byte[] data;
+    private float[] points;
+    private boolean active;
+
+    public VisualizerView(Context context) {
+        super(context);
+
+        paint.setStrokeWidth(2f);
+        paint.setAntiAlias(true);
+        paint.setColor(Color.rgb(129, 201, 54));
+    }
+
+    public boolean isActive() {
+        return active;
+    }
+
+    public void setActive(boolean active) {
+        this.active = active;
+        Visualizer visualizer = getVizualiser();
+        if (visualizer == null) {
+            return;
+        }
+
+        int captureRate = Math.min(PREFERRED_CAPTURE_RATE_MILLIHERTZ, Visualizer.getMaxCaptureRate());
+        if (active) {
+            visualizer.setDataCaptureListener(new Visualizer.OnDataCaptureListener() {
+                @Override
+                public void onWaveFormDataCapture(Visualizer visualizer, byte[] waveform, int samplingRate) {
+                    updateVisualizer(waveform);
+                }
+
+                @Override
+                public void onFftDataCapture(Visualizer visualizer, byte[] fft, int samplingRate) {
+                }
+            }, captureRate, true, false);
+        } else {
+            visualizer.setDataCaptureListener(null, captureRate, false, false);
+        }
+
+        visualizer.setEnabled(active);
+        invalidate();
+    }
+
+    private Visualizer getVizualiser() {
+        DownloadService downloadService = DownloadServiceImpl.getInstance();
+        VisualizerController visualizerController = downloadService == null ? null : downloadService.getVisualizerController();
+        return visualizerController == null ? null : visualizerController.getVisualizer();
+    }
+
+    private void updateVisualizer(byte[] waveform) {
+        this.data = waveform;
+        invalidate();
+    }
+
+    @Override
+    protected void onDraw(Canvas canvas) {
+        super.onDraw(canvas);
+
+        if (!active) {
+            return;
+        }
+        DownloadService downloadService = DownloadServiceImpl.getInstance();
+        if (downloadService != null && downloadService.getPlayerState() != PlayerState.STARTED) {
+            return;
+        }
+
+        if (data == null) {
+            return;
+        }
+
+        if (points == null || points.length < data.length * 4) {
+            points = new float[data.length * 4];
+        }
+
+        int w = getWidth();
+        int h = getHeight();
+
+        for (int i = 0; i < data.length - 1; i++) {
+            points[i * 4] = w * i / (data.length - 1);
+            points[i * 4 + 1] = h / 2 + ((byte) (data[i] + 128)) * (h / 2) / 128;
+            points[i * 4 + 2] = w * (i + 1) / (data.length - 1);
+            points[i * 4 + 3] = h / 2 + ((byte) (data[i + 1] + 128)) * (h / 2) / 128;
+        }
+
+        canvas.drawLines(points, paint);
+    }
+}