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Detecting environment-facing (i.e. backside) cam #5

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Detecting environment-facing (i.e. backside) cam #5

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c1173f9
Detecting environment-facing (i.e. backside) cam
AVGP Apr 6, 2015
63ec39e
Refactored backface cam detection
Apr 6, 2015
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67 changes: 45 additions & 22 deletions examples/js/goggle-paper.js
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Original file line number Diff line number Diff line change
Expand Up @@ -21,6 +21,28 @@ function moving_average(period) {
}
}

function startCamStream(video, streamId) {
var opts = { video: true };
if(streamId !== undefined) {
opts.video = {optional: [{sourceId: mediaSource.id}]};
}

navigator.getUserMedia(opts,
function (stream){
if (window.webkitURL) {
video.src = window.webkitURL.createObjectURL(stream);
} else if (vid.mozSrcObject !== undefined) {
video.mozSrcObject = stream;
} else {
video.src = stream;
}
},
function(error){
console.log('stream not found');
}
);
}

var GP = GP || {};

GP.PaperTracker = function(options){
Expand Down Expand Up @@ -66,20 +88,22 @@ GP.PaperTracker.prototype.init = function(options){

GP.PaperTracker.prototype.postInit = function(){
var vid = this.video;
navigator.getUserMedia({video:true},
function (stream){
if (window.webkitURL) {
vid.src = window.webkitURL.createObjectURL(stream);
} else if (vid.mozSrcObject !== undefined) {
vid.mozSrcObject = stream;
} else {
vid.src = stream;
}
},
function(error){
console.log('stream not found');
}
);

if(MediaStreamTrack && MediaStreamTrack.getSources) {
MediaStreamTrack.getSources(function(mediaSources) {
mediaSources.forEach(function(mediaSource){
if (mediaSource.kind === 'video' && mediaSource.facing == "environment") {
startCamStream(vid, mediaSource.id);
return;
}
});
// No backside camera found, defaulting to any camera
startCamStream(vid);
});
} else {
startCamStream(vid);
}

};

GP.PaperTracker.prototype.snapshot = function(){
Expand Down Expand Up @@ -113,10 +137,10 @@ GP.PaperTracker.prototype.drawCorners = function(){

for (i = 0; i < this.markers.length; ++ i){
corners = this.markers[i].corners;

this.context.strokeStyle = "red";
this.context.beginPath();

for (j = 0; j < corners.length; ++ j){
corner = corners[j];
this.context.moveTo(corner.x, corner.y);
Expand All @@ -126,7 +150,7 @@ GP.PaperTracker.prototype.drawCorners = function(){

this.context.stroke();
this.context.closePath();

this.context.strokeStyle = "blue";
this.context.strokeRect(corners[0].x - 2, corners[0].y - 2, 4, 4);
}
Expand All @@ -135,7 +159,7 @@ GP.PaperTracker.prototype.drawCorners = function(){

GP.PaperTracker.prototype.updateTracking = function(){
var corners, corner, pose, i;

if (this.markers.length == 0) {
this.trackingInfo.haveTracking = false;
return false;
Expand All @@ -145,14 +169,14 @@ GP.PaperTracker.prototype.updateTracking = function(){
this.trackingInfo.haveTracking = true;

corners = this.markers[0].corners;

for (i = 0; i < corners.length; ++ i){
corner = corners[i];

corner.x = corner.x - (this.canvas.width / 2);
corner.y = (this.canvas.height / 2) - corner.y;
}

pose = this.posit.pose(corners);

var rotation = pose.bestRotation;
Expand All @@ -163,4 +187,3 @@ GP.PaperTracker.prototype.updateTracking = function(){

return this.trackingInfo;
};