Implemented video view page with stereoscopic options

[serve0] / stereoview.js

diff --git a/stereoview.js b/stereoview.js
new file mode 100644 (file)
index 0000000..50863d5
--- /dev/null
+++ b/stereoview.js
@@ -0,0 +1,123 @@
+/*  Copyright 2018 Paul Hänsch
+   
+    This file is part of Serve0
+    
+    Serve0 is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+    
+    Serve0 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 Affero General Public License for more details.
+    
+    You should have received a copy of the GNU Affero General Public License
+    along with Serve0  If not, see <http://www.gnu.org/licenses/>. 
+*/
+
+var render, video, controlTimeout = 0;
+var pitch = 0, roll = 0, yaw = 0;
+var w, h, hdeg, vdeg, scale, fov = 90;
+var lv = document.createElement("canvas");
+var rv = document.createElement("canvas");
+var debug = document.createElement("p");
+var gp;
+
+function draw() {
+  sw = fov * hdeg |0;
+  sh = h / 2 |0;
+  dh = h / 2 * scale |0;
+
+  if ( layout == "180" ) {
+    sx = (w / 2 - fov * hdeg) / 2 +   yaw * hdeg |0;
+    sy = (    h - fov * vdeg) / 2 + pitch * vdeg |0;
+    if   (sx + sw > w / 2) { sx = w / 2 - sw; } else if (sx < 0) { sx = 0; }
+    lc.drawImage(video,         sx, sy, sw, sh, 0, 0, lv.width, dh);
+    rc.drawImage(video, w / 2 + sx, sy, sw, sh, 0, 0, rv.width, dh);
+  } else {
+    sx = (w - fov * hdeg) / 2 + yaw   * hdeg |0;
+    sy = (h - fov * vdeg) / 4 + pitch * vdeg |0;
+    lc.drawImage(video, sx,       sy, sw, sh, 0, 0, lv.width, dh);
+    rc.drawImage(video, sx, h/2 + sy, sw, sh, 0, 0, rv.width, dh);
+    if (sx < 0) {
+      lc.drawImage(video, sx + w,       sy, sw, sh, 0, 0, lv.width, dh);
+      rc.drawImage(video, sx + w, h/2 + sy, sw, sh, 0, 0, rv.width, dh);
+    } else if ( sx + fov * hdeg > w) {
+      lc.drawImage(video, sx - w,       sy, sw, sh, 0, 0, lv.width, dh);
+      rc.drawImage(video, sx - w, h/2 + sy, sw, sh, 0, 0, rv.width, dh);
+    }
+  }
+
+  lv.style.transform = "rotate(" + roll + "deg)";
+  rv.style.transform = "rotate(" + roll + "deg)";
+
+  requestAnimationFrame(draw);
+
+  gp = navigator.getGamepads()[0];
+  if ( gp && Date.now() > controlTimeout ) {
+    if ( gp.axes[0] >  .3) { video.currentTime += 10; controlTimeout = Date.now() + 500; }
+    if ( gp.axes[0] < -.3) { video.currentTime -= 10; controlTimeout = Date.now() + 500; }
+    if ( gp.axes[1] < -.3) { video.currentTime += 60; controlTimeout = Date.now() + 500; }
+    if ( gp.axes[1] >  .3) { video.currentTime -= 60; controlTimeout = Date.now() + 500; }
+    if ( gp.buttons[0].pressed ) { video.currentTime += 1/30; video.pause(); }
+    if ( gp.buttons[1].pressed ) { video.play(); }
+    if ( gp.buttons[2].pressed ) { fov -= 10; controlTimeout = Date.now() + 500; }
+    if ( gp.buttons[3].pressed ) { fov += 10; controlTimeout = Date.now() + 500; }
+  }
+
+  // debug.textContent = "" + video.currentTime + " " + controlTimeout;
+};
+
+function stereoview(layout, video) {
+  this.layout = layout; this.video = video;
+  document.body.appendChild( lv );
+  document.body.appendChild( rv );
+  document.body.appendChild( debug );
+  
+  lv.setAttribute( "style", "position: fixed; top: 0; left:  0 ; width: 50%; height: 100%; z-index: 100;");
+  rv.setAttribute( "style", "position: fixed; top: 0; left: 50%; width: 50%; height: 100%; z-index: 100;");
+  debug.setAttribute( "style", "position: fixed; top: 0; left: 0; z-index: 101; background: #000;");
+
+  lv.setAttribute( "width", "" + lv.offsetWidth);
+  rv.setAttribute( "width", "" + rv.offsetWidth);
+  lv.setAttribute("height", "" + lv.offsetHeight);
+  rv.setAttribute("height", "" + rv.offsetHeight);
+  
+  lc = lv.getContext("2d");
+  rc = rv.getContext("2d");
+  
+  window.addEventListener("devicemotion", (function() {
+    var x = [], y = [], z = [], cnt = -1, inertia = 6;
+    return function(event) {
+      cnt = (cnt + 1) % inertia;
+
+      x[cnt] = event.accelerationIncludingGravity.x;
+      y[cnt] = event.accelerationIncludingGravity.y;
+      z[cnt] = event.accelerationIncludingGravity.z;
+
+      tx = 0; x.forEach( function(n, i){ tx += n; } ); tx /= inertia;
+      ty = 0; y.forEach( function(n, i){ ty += n; } ); ty /= inertia;
+      tz = 0; z.forEach( function(n, i){ tz += n; } ); tz /= inertia;
+
+      pitch =   Math.asin((tz / 9.81 > 1)?1:(tz/9.81)) / Math.PI * 180 + 22.5;
+      roll  = - Math.asin((ty / 9.81 > 1)?1:(ty/9.81)) / Math.PI * 180;
+      yaw   = (yaw + ty) % 360;
+    };
+  })());
+
+  window.addEventListener("click", function(event) {
+    (lv.parentElement)?lv.parentElement.removeChild(lv):{};
+    (rv.parentElement)?rv.parentElement.removeChild(rv):{};
+    video.style.display = "block";
+    video.pause();
+  }, true);
+
+  w = video.videoWidth; h = video.videoHeight;
+  hdeg = w / 360; vdeg = h / 180;
+  scale = lv.width / (fov * hdeg |0);
+  // scale = lv.width / (w / 4);
+  video.play();
+  video.style.display = "none";
+  draw();
+};