Add a WebRTC example for a blog post
authorjonlee@apple.com <jonlee@apple.com@268f45cc-cd09-0410-ab3c-d52691b4dbfc>
Sat, 1 Jul 2017 04:53:14 +0000 (04:53 +0000)
committerjonlee@apple.com <jonlee@apple.com@268f45cc-cd09-0410-ab3c-d52691b4dbfc>
Sat, 1 Jul 2017 04:53:14 +0000 (04:53 +0000)
https://bugs.webkit.org/show_bug.cgi?id=174049

Reviewed by Youenn Fablet.

Example does a typical WebRTC video call, but uses canvas to do some image effects.
Image effects will last for 30 seconds.
After that time, the video stream is directly sent.
This illustrates using RTCPeerConnection, replaceTrack and canvas capture.

* blog-files/webrtc/pc-with-effects/LICENSE: Added.
* blog-files/webrtc/pc-with-effects/glfx.js: Added.
* blog-files/webrtc/pc-with-effects/index.html: Added.
* blog-files/webrtc/pc-with-effects/main.css: Added.
* blog-files/webrtc/pc-with-effects/main.js: Added.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@219040 268f45cc-cd09-0410-ab3c-d52691b4dbfc

Websites/webkit.org/ChangeLog
Websites/webkit.org/blog-files/webrtc/pc-with-effects/LICENSE [new file with mode: 0644]
Websites/webkit.org/blog-files/webrtc/pc-with-effects/glfx.js [new file with mode: 0644]
Websites/webkit.org/blog-files/webrtc/pc-with-effects/index.html [new file with mode: 0644]
Websites/webkit.org/blog-files/webrtc/pc-with-effects/main.css [new file with mode: 0644]
Websites/webkit.org/blog-files/webrtc/pc-with-effects/main.js [new file with mode: 0644]

index de0562e..f14c616 100644 (file)
@@ -1,3 +1,21 @@
+2017-06-30  Jon Lee  <jonlee@apple.com>
+
+        Add a WebRTC example for a blog post
+        https://bugs.webkit.org/show_bug.cgi?id=174049
+
+        Reviewed by Youenn Fablet.
+
+        Example does a typical WebRTC video call, but uses canvas to do some image effects.
+        Image effects will last for 30 seconds.
+        After that time, the video stream is directly sent.
+        This illustrates using RTCPeerConnection, replaceTrack and canvas capture.
+
+        * blog-files/webrtc/pc-with-effects/LICENSE: Added.
+        * blog-files/webrtc/pc-with-effects/glfx.js: Added.
+        * blog-files/webrtc/pc-with-effects/index.html: Added.
+        * blog-files/webrtc/pc-with-effects/main.css: Added.
+        * blog-files/webrtc/pc-with-effects/main.js: Added.
+
 2017-06-28  Saam Barati  <sbarati@apple.com>
 
         Add a Object rest/spread test to the experimental features test page
diff --git a/Websites/webkit.org/blog-files/webrtc/pc-with-effects/LICENSE b/Websites/webkit.org/blog-files/webrtc/pc-with-effects/LICENSE
new file mode 100644 (file)
index 0000000..7949819
--- /dev/null
@@ -0,0 +1,29 @@
+Copyright (c) 2014, The WebRTC project authors. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+  * Redistributions of source code must retain the above copyright
+    notice, this list of conditions and the following disclaimer.
+
+  * Redistributions in binary form must reproduce the above copyright
+    notice, this list of conditions and the following disclaimer in
+    the documentation and/or other materials provided with the
+    distribution.
+
+  * Neither the name of Google nor the names of its contributors may
+    be used to endorse or promote products derived from this software
+    without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
\ No newline at end of file
diff --git a/Websites/webkit.org/blog-files/webrtc/pc-with-effects/glfx.js b/Websites/webkit.org/blog-files/webrtc/pc-with-effects/glfx.js
new file mode 100644 (file)
index 0000000..f8f29ba
--- /dev/null
@@ -0,0 +1,59 @@
+/*
+ * glfx.js
+ * http://evanw.github.com/glfx.js/
+ *
+ * Copyright 2011 Evan Wallace
+ * Released under the MIT license
+ */
+var fx=function(){function q(a,d,c){return Math.max(a,Math.min(d,c))}function w(b){return{_:b,loadContentsOf:function(b){a=this._.gl;this._.loadContentsOf(b)},destroy:function(){a=this._.gl;this._.destroy()}}}function A(a){return w(r.fromElement(a))}function B(b,d){var c=a.UNSIGNED_BYTE;if(a.getExtension("OES_texture_float")&&a.getExtension("OES_texture_float_linear")){var e=new r(100,100,a.RGBA,a.FLOAT);try{e.drawTo(function(){c=a.FLOAT})}catch(g){}e.destroy()}this._.texture&&this._.texture.destroy();
+this._.spareTexture&&this._.spareTexture.destroy();this.width=b;this.height=d;this._.texture=new r(b,d,a.RGBA,c);this._.spareTexture=new r(b,d,a.RGBA,c);this._.extraTexture=this._.extraTexture||new r(0,0,a.RGBA,c);this._.flippedShader=this._.flippedShader||new h(null,"uniform sampler2D texture;varying vec2 texCoord;void main(){gl_FragColor=texture2D(texture,vec2(texCoord.x,1.0-texCoord.y));}");this._.isInitialized=!0}function C(a,d,c){this._.isInitialized&&
+a._.width==this.width&&a._.height==this.height||B.call(this,d?d:a._.width,c?c:a._.height);a._.use();this._.texture.drawTo(function(){h.getDefaultShader().drawRect()});return this}function D(){this._.texture.use();this._.flippedShader.drawRect();return this}function f(a,d,c,e){(c||this._.texture).use();this._.spareTexture.drawTo(function(){a.uniforms(d).drawRect()});this._.spareTexture.swapWith(e||this._.texture)}function E(a){a.parentNode.insertBefore(this,a);a.parentNode.removeChild(a);return this}
+function F(){var b=new r(this._.texture.width,this._.texture.height,a.RGBA,a.UNSIGNED_BYTE);this._.texture.use();b.drawTo(function(){h.getDefaultShader().drawRect()});return w(b)}function G(){var b=this._.texture.width,d=this._.texture.height,c=new Uint8Array(4*b*d);this._.texture.drawTo(function(){a.readPixels(0,0,b,d,a.RGBA,a.UNSIGNED_BYTE,c)});return c}function k(b){return function(){a=this._.gl;return b.apply(this,arguments)}}function x(a,d,c,e,g,l,n,p){var m=c-g,h=e-l,f=n-g,k=p-l;g=a-c+g-n;l=
+d-e+l-p;var q=m*k-f*h,f=(g*k-f*l)/q,m=(m*l-g*h)/q;return[c-a+f*c,e-d+f*e,f,n-a+m*n,p-d+m*p,m,a,d,1]}function y(a){var d=a[0],c=a[1],e=a[2],g=a[3],l=a[4],n=a[5],p=a[6],m=a[7];a=a[8];var f=d*l*a-d*n*m-c*g*a+c*n*p+e*g*m-e*l*p;return[(l*a-n*m)/f,(e*m-c*a)/f,(c*n-e*l)/f,(n*p-g*a)/f,(d*a-e*p)/f,(e*g-d*n)/f,(g*m-l*p)/f,(c*p-d*m)/f,(d*l-c*g)/f]}function z(a){var d=a.length;this.xa=[];this.ya=[];this.u=[];this.y2=[];a.sort(function(a,b){return a[0]-b[0]});for(var c=0;c<d;c++)this.xa.push(a[c][0]),this.ya.push(a[c][1]);
+this.u[0]=0;this.y2[0]=0;for(c=1;c<d-1;++c){a=this.xa[c+1]-this.xa[c-1];var e=(this.xa[c]-this.xa[c-1])/a,g=e*this.y2[c-1]+2;this.y2[c]=(e-1)/g;this.u[c]=(6*((this.ya[c+1]-this.ya[c])/(this.xa[c+1]-this.xa[c])-(this.ya[c]-this.ya[c-1])/(this.xa[c]-this.xa[c-1]))/a-e*this.u[c-1])/g}this.y2[d-1]=0;for(c=d-2;0<=c;--c)this.y2[c]=this.y2[c]*this.y2[c+1]+this.u[c]}function u(a,d){return new h(null,a+"uniform sampler2D texture;uniform vec2 texSize;varying vec2 texCoord;void main(){vec2 coord=texCoord*texSize;"+
+d+"gl_FragColor=texture2D(texture,coord/texSize);vec2 clampedCoord=clamp(coord,vec2(0.0),texSize);if(coord!=clampedCoord){gl_FragColor.a*=max(0.0,1.0-length(coord-clampedCoord));}}")}function H(b,d){a.brightnessContrast=a.brightnessContrast||new h(null,"uniform sampler2D texture;uniform float brightness;uniform float contrast;varying vec2 texCoord;void main(){vec4 color=texture2D(texture,texCoord);color.rgb+=brightness;if(contrast>0.0){color.rgb=(color.rgb-0.5)/(1.0-contrast)+0.5;}else{color.rgb=(color.rgb-0.5)*(1.0+contrast)+0.5;}gl_FragColor=color;}");
+f.call(this,a.brightnessContrast,{brightness:q(-1,b,1),contrast:q(-1,d,1)});return this}function t(a){a=new z(a);for(var d=[],c=0;256>c;c++)d.push(q(0,Math.floor(256*a.interpolate(c/255)),255));return d}function I(b,d,c){b=t(b);1==arguments.length?d=c=b:(d=t(d),c=t(c));for(var e=[],g=0;256>g;g++)e.splice(e.length,0,b[g],d[g],c[g],255);this._.extraTexture.initFromBytes(256,1,e);this._.extraTexture.use(1);a.curves=a.curves||new h(null,"uniform sampler2D texture;uniform sampler2D map;varying vec2 texCoord;void main(){vec4 color=texture2D(texture,texCoord);color.r=texture2D(map,vec2(color.r)).r;color.g=texture2D(map,vec2(color.g)).g;color.b=texture2D(map,vec2(color.b)).b;gl_FragColor=color;}");
+a.curves.textures({map:1});f.call(this,a.curves,{});return this}function J(b){a.denoise=a.denoise||new h(null,"uniform sampler2D texture;uniform float exponent;uniform float strength;uniform vec2 texSize;varying vec2 texCoord;void main(){vec4 center=texture2D(texture,texCoord);vec4 color=vec4(0.0);float total=0.0;for(float x=-4.0;x<=4.0;x+=1.0){for(float y=-4.0;y<=4.0;y+=1.0){vec4 sample=texture2D(texture,texCoord+vec2(x,y)/texSize);float weight=1.0-abs(dot(sample.rgb-center.rgb,vec3(0.25)));weight=pow(weight,exponent);color+=sample*weight;total+=weight;}}gl_FragColor=color/total;}");
+for(var d=0;2>d;d++)f.call(this,a.denoise,{exponent:Math.max(0,b),texSize:[this.width,this.height]});return this}function K(b,d){a.hueSaturation=a.hueSaturation||new h(null,"uniform sampler2D texture;uniform float hue;uniform float saturation;varying vec2 texCoord;void main(){vec4 color=texture2D(texture,texCoord);float angle=hue*3.14159265;float s=sin(angle),c=cos(angle);vec3 weights=(vec3(2.0*c,-sqrt(3.0)*s-c,sqrt(3.0)*s-c)+1.0)/3.0;float len=length(color.rgb);color.rgb=vec3(dot(color.rgb,weights.xyz),dot(color.rgb,weights.zxy),dot(color.rgb,weights.yzx));float average=(color.r+color.g+color.b)/3.0;if(saturation>0.0){color.rgb+=(average-color.rgb)*(1.0-1.0/(1.001-saturation));}else{color.rgb+=(average-color.rgb)*(-saturation);}gl_FragColor=color;}");
+f.call(this,a.hueSaturation,{hue:q(-1,b,1),saturation:q(-1,d,1)});return this}function L(b){a.noise=a.noise||new h(null,"uniform sampler2D texture;uniform float amount;varying vec2 texCoord;float rand(vec2 co){return fract(sin(dot(co.xy,vec2(12.9898,78.233)))*43758.5453);}void main(){vec4 color=texture2D(texture,texCoord);float diff=(rand(texCoord)-0.5)*amount;color.r+=diff;color.g+=diff;color.b+=diff;gl_FragColor=color;}");
+f.call(this,a.noise,{amount:q(0,b,1)});return this}function M(b){a.sepia=a.sepia||new h(null,"uniform sampler2D texture;uniform float amount;varying vec2 texCoord;void main(){vec4 color=texture2D(texture,texCoord);float r=color.r;float g=color.g;float b=color.b;color.r=min(1.0,(r*(1.0-(0.607*amount)))+(g*(0.769*amount))+(b*(0.189*amount)));color.g=min(1.0,(r*0.349*amount)+(g*(1.0-(0.314*amount)))+(b*0.168*amount));color.b=min(1.0,(r*0.272*amount)+(g*0.534*amount)+(b*(1.0-(0.869*amount))));gl_FragColor=color;}");
+f.call(this,a.sepia,{amount:q(0,b,1)});return this}function N(b,d){a.unsharpMask=a.unsharpMask||new h(null,"uniform sampler2D blurredTexture;uniform sampler2D originalTexture;uniform float strength;uniform float threshold;varying vec2 texCoord;void main(){vec4 blurred=texture2D(blurredTexture,texCoord);vec4 original=texture2D(originalTexture,texCoord);gl_FragColor=mix(blurred,original,1.0+strength);}");
+this._.extraTexture.ensureFormat(this._.texture);this._.texture.use();this._.extraTexture.drawTo(function(){h.getDefaultShader().drawRect()});this._.extraTexture.use(1);this.triangleBlur(b);a.unsharpMask.textures({originalTexture:1});f.call(this,a.unsharpMask,{strength:d});this._.extraTexture.unuse(1);return this}function O(b){a.vibrance=a.vibrance||new h(null,"uniform sampler2D texture;uniform float amount;varying vec2 texCoord;void main(){vec4 color=texture2D(texture,texCoord);float average=(color.r+color.g+color.b)/3.0;float mx=max(color.r,max(color.g,color.b));float amt=(mx-average)*(-amount*3.0);color.rgb=mix(color.rgb,vec3(mx),amt);gl_FragColor=color;}");
+f.call(this,a.vibrance,{amount:q(-1,b,1)});return this}function P(b,d){a.vignette=a.vignette||new h(null,"uniform sampler2D texture;uniform float size;uniform float amount;varying vec2 texCoord;void main(){vec4 color=texture2D(texture,texCoord);float dist=distance(texCoord,vec2(0.5,0.5));color.rgb*=smoothstep(0.8,size*0.799,dist*(amount+size));gl_FragColor=color;}");
+f.call(this,a.vignette,{size:q(0,b,1),amount:q(0,d,1)});return this}function Q(b,d,c){a.lensBlurPrePass=a.lensBlurPrePass||new h(null,"uniform sampler2D texture;uniform float power;varying vec2 texCoord;void main(){vec4 color=texture2D(texture,texCoord);color=pow(color,vec4(power));gl_FragColor=vec4(color);}");var e="uniform sampler2D texture0;uniform sampler2D texture1;uniform vec2 delta0;uniform vec2 delta1;uniform float power;varying vec2 texCoord;"+
+s+"vec4 sample(vec2 delta){float offset=random(vec3(delta,151.7182),0.0);vec4 color=vec4(0.0);float total=0.0;for(float t=0.0;t<=30.0;t++){float percent=(t+offset)/30.0;color+=texture2D(texture0,texCoord+delta*percent);total+=1.0;}return color/total;}";
+a.lensBlur0=a.lensBlur0||new h(null,e+"void main(){gl_FragColor=sample(delta0);}");a.lensBlur1=a.lensBlur1||new h(null,e+"void main(){gl_FragColor=(sample(delta0)+sample(delta1))*0.5;}");a.lensBlur2=a.lensBlur2||(new h(null,e+"void main(){vec4 color=(sample(delta0)+2.0*texture2D(texture1,texCoord))/3.0;gl_FragColor=pow(color,vec4(power));}")).textures({texture1:1});for(var e=
+[],g=0;3>g;g++){var l=c+2*g*Math.PI/3;e.push([b*Math.sin(l)/this.width,b*Math.cos(l)/this.height])}b=Math.pow(10,q(-1,d,1));f.call(this,a.lensBlurPrePass,{power:b});this._.extraTexture.ensureFormat(this._.texture);f.call(this,a.lensBlur0,{delta0:e[0]},this._.texture,this._.extraTexture);f.call(this,a.lensBlur1,{delta0:e[1],delta1:e[2]},this._.extraTexture,this._.extraTexture);f.call(this,a.lensBlur0,{delta0:e[1]});this._.extraTexture.use(1);f.call(this,a.lensBlur2,{power:1/b,delta0:e[2]});return this}
+function R(b,d,c,e,g,l){a.tiltShift=a.tiltShift||new h(null,"uniform sampler2D texture;uniform float blurRadius;uniform float gradientRadius;uniform vec2 start;uniform vec2 end;uniform vec2 delta;uniform vec2 texSize;varying vec2 texCoord;"+s+"void main(){vec4 color=vec4(0.0);float total=0.0;float offset=random(vec3(12.9898,78.233,151.7182),0.0);vec2 normal=normalize(vec2(start.y-end.y,end.x-start.x));float radius=smoothstep(0.0,1.0,abs(dot(texCoord*texSize-start,normal))/gradientRadius)*blurRadius;for(float t=-30.0;t<=30.0;t++){float percent=(t+offset-0.5)/30.0;float weight=1.0-abs(percent);vec4 sample=texture2D(texture,texCoord+delta/texSize*percent*radius);sample.rgb*=sample.a;color+=sample*weight;total+=weight;}gl_FragColor=color/total;gl_FragColor.rgb/=gl_FragColor.a+0.00001;}");
+var n=c-b,p=e-d,m=Math.sqrt(n*n+p*p);f.call(this,a.tiltShift,{blurRadius:g,gradientRadius:l,start:[b,d],end:[c,e],delta:[n/m,p/m],texSize:[this.width,this.height]});f.call(this,a.tiltShift,{blurRadius:g,gradientRadius:l,start:[b,d],end:[c,e],delta:[-p/m,n/m],texSize:[this.width,this.height]});return this}function S(b){a.triangleBlur=a.triangleBlur||new h(null,"uniform sampler2D texture;uniform vec2 delta;varying vec2 texCoord;"+s+"void main(){vec4 color=vec4(0.0);float total=0.0;float offset=random(vec3(12.9898,78.233,151.7182),0.0);for(float t=-30.0;t<=30.0;t++){float percent=(t+offset-0.5)/30.0;float weight=1.0-abs(percent);vec4 sample=texture2D(texture,texCoord+delta*percent);sample.rgb*=sample.a;color+=sample*weight;total+=weight;}gl_FragColor=color/total;gl_FragColor.rgb/=gl_FragColor.a+0.00001;}");
+f.call(this,a.triangleBlur,{delta:[b/this.width,0]});f.call(this,a.triangleBlur,{delta:[0,b/this.height]});return this}function T(b,d,c){a.zoomBlur=a.zoomBlur||new h(null,"uniform sampler2D texture;uniform vec2 center;uniform float strength;uniform vec2 texSize;varying vec2 texCoord;"+s+"void main(){vec4 color=vec4(0.0);float total=0.0;vec2 toCenter=center-texCoord*texSize;float offset=random(vec3(12.9898,78.233,151.7182),0.0);for(float t=0.0;t<=40.0;t++){float percent=(t+offset)/40.0;float weight=4.0*(percent-percent*percent);vec4 sample=texture2D(texture,texCoord+toCenter*percent*strength/texSize);sample.rgb*=sample.a;color+=sample*weight;total+=weight;}gl_FragColor=color/total;gl_FragColor.rgb/=gl_FragColor.a+0.00001;}");
+f.call(this,a.zoomBlur,{center:[b,d],strength:c,texSize:[this.width,this.height]});return this}function U(b,d,c,e){a.colorHalftone=a.colorHalftone||new h(null,"uniform sampler2D texture;uniform vec2 center;uniform float angle;uniform float scale;uniform vec2 texSize;varying vec2 texCoord;float pattern(float angle){float s=sin(angle),c=cos(angle);vec2 tex=texCoord*texSize-center;vec2 point=vec2(c*tex.x-s*tex.y,s*tex.x+c*tex.y)*scale;return(sin(point.x)*sin(point.y))*4.0;}void main(){vec4 color=texture2D(texture,texCoord);vec3 cmy=1.0-color.rgb;float k=min(cmy.x,min(cmy.y,cmy.z));cmy=(cmy-k)/(1.0-k);cmy=clamp(cmy*10.0-3.0+vec3(pattern(angle+0.26179),pattern(angle+1.30899),pattern(angle)),0.0,1.0);k=clamp(k*10.0-5.0+pattern(angle+0.78539),0.0,1.0);gl_FragColor=vec4(1.0-cmy-k,color.a);}");
+f.call(this,a.colorHalftone,{center:[b,d],angle:c,scale:Math.PI/e,texSize:[this.width,this.height]});return this}function V(b,d,c,e){a.dotScreen=a.dotScreen||new h(null,"uniform sampler2D texture;uniform vec2 center;uniform float angle;uniform float scale;uniform vec2 texSize;varying vec2 texCoord;float pattern(){float s=sin(angle),c=cos(angle);vec2 tex=texCoord*texSize-center;vec2 point=vec2(c*tex.x-s*tex.y,s*tex.x+c*tex.y)*scale;return(sin(point.x)*sin(point.y))*4.0;}void main(){vec4 color=texture2D(texture,texCoord);float average=(color.r+color.g+color.b)/3.0;gl_FragColor=vec4(vec3(average*10.0-5.0+pattern()),color.a);}");
+f.call(this,a.dotScreen,{center:[b,d],angle:c,scale:Math.PI/e,texSize:[this.width,this.height]});return this}function W(b){a.edgeWork1=a.edgeWork1||new h(null,"uniform sampler2D texture;uniform vec2 delta;varying vec2 texCoord;"+s+"void main(){vec2 color=vec2(0.0);vec2 total=vec2(0.0);float offset=random(vec3(12.9898,78.233,151.7182),0.0);for(float t=-30.0;t<=30.0;t++){float percent=(t+offset-0.5)/30.0;float weight=1.0-abs(percent);vec3 sample=texture2D(texture,texCoord+delta*percent).rgb;float average=(sample.r+sample.g+sample.b)/3.0;color.x+=average*weight;total.x+=weight;if(abs(t)<15.0){weight=weight*2.0-1.0;color.y+=average*weight;total.y+=weight;}}gl_FragColor=vec4(color/total,0.0,1.0);}");
+a.edgeWork2=a.edgeWork2||new h(null,"uniform sampler2D texture;uniform vec2 delta;varying vec2 texCoord;"+s+"void main(){vec2 color=vec2(0.0);vec2 total=vec2(0.0);float offset=random(vec3(12.9898,78.233,151.7182),0.0);for(float t=-30.0;t<=30.0;t++){float percent=(t+offset-0.5)/30.0;float weight=1.0-abs(percent);vec2 sample=texture2D(texture,texCoord+delta*percent).xy;color.x+=sample.x*weight;total.x+=weight;if(abs(t)<15.0){weight=weight*2.0-1.0;color.y+=sample.y*weight;total.y+=weight;}}float c=clamp(10000.0*(color.y/total.y-color.x/total.x)+0.5,0.0,1.0);gl_FragColor=vec4(c,c,c,1.0);}");
+f.call(this,a.edgeWork1,{delta:[b/this.width,0]});f.call(this,a.edgeWork2,{delta:[0,b/this.height]});return this}function X(b,d,c){a.hexagonalPixelate=a.hexagonalPixelate||new h(null,"uniform sampler2D texture;uniform vec2 center;uniform float scale;uniform vec2 texSize;varying vec2 texCoord;void main(){vec2 tex=(texCoord*texSize-center)/scale;tex.y/=0.866025404;tex.x-=tex.y*0.5;vec2 a;if(tex.x+tex.y-floor(tex.x)-floor(tex.y)<1.0)a=vec2(floor(tex.x),floor(tex.y));else a=vec2(ceil(tex.x),ceil(tex.y));vec2 b=vec2(ceil(tex.x),floor(tex.y));vec2 c=vec2(floor(tex.x),ceil(tex.y));vec3 TEX=vec3(tex.x,tex.y,1.0-tex.x-tex.y);vec3 A=vec3(a.x,a.y,1.0-a.x-a.y);vec3 B=vec3(b.x,b.y,1.0-b.x-b.y);vec3 C=vec3(c.x,c.y,1.0-c.x-c.y);float alen=length(TEX-A);float blen=length(TEX-B);float clen=length(TEX-C);vec2 choice;if(alen<blen){if(alen<clen)choice=a;else choice=c;}else{if(blen<clen)choice=b;else choice=c;}choice.x+=choice.y*0.5;choice.y*=0.866025404;choice*=scale/texSize;gl_FragColor=texture2D(texture,choice+center/texSize);}");
+f.call(this,a.hexagonalPixelate,{center:[b,d],scale:c,texSize:[this.width,this.height]});return this}function Y(b){a.ink=a.ink||new h(null,"uniform sampler2D texture;uniform float strength;uniform vec2 texSize;varying vec2 texCoord;void main(){vec2 dx=vec2(1.0/texSize.x,0.0);vec2 dy=vec2(0.0,1.0/texSize.y);vec4 color=texture2D(texture,texCoord);float bigTotal=0.0;float smallTotal=0.0;vec3 bigAverage=vec3(0.0);vec3 smallAverage=vec3(0.0);for(float x=-2.0;x<=2.0;x+=1.0){for(float y=-2.0;y<=2.0;y+=1.0){vec3 sample=texture2D(texture,texCoord+dx*x+dy*y).rgb;bigAverage+=sample;bigTotal+=1.0;if(abs(x)+abs(y)<2.0){smallAverage+=sample;smallTotal+=1.0;}}}vec3 edge=max(vec3(0.0),bigAverage/bigTotal-smallAverage/smallTotal);gl_FragColor=vec4(color.rgb-dot(edge,edge)*strength*100000.0,color.a);}");
+f.call(this,a.ink,{strength:b*b*b*b*b,texSize:[this.width,this.height]});return this}function Z(b,d,c,e){a.bulgePinch=a.bulgePinch||u("uniform float radius;uniform float strength;uniform vec2 center;","coord-=center;float distance=length(coord);if(distance<radius){float percent=distance/radius;if(strength>0.0){coord*=mix(1.0,smoothstep(0.0,radius/distance,percent),strength*0.75);}else{coord*=mix(1.0,pow(percent,1.0+strength*0.75)*radius/distance,1.0-percent);}}coord+=center;");
+f.call(this,a.bulgePinch,{radius:c,strength:q(-1,e,1),center:[b,d],texSize:[this.width,this.height]});return this}function $(b,d,c){a.matrixWarp=a.matrixWarp||u("uniform mat3 matrix;uniform bool useTextureSpace;","if(useTextureSpace)coord=coord/texSize*2.0-1.0;vec3 warp=matrix*vec3(coord,1.0);coord=warp.xy/warp.z;if(useTextureSpace)coord=(coord*0.5+0.5)*texSize;");b=Array.prototype.concat.apply([],b);if(4==b.length)b=
+[b[0],b[1],0,b[2],b[3],0,0,0,1];else if(9!=b.length)throw"can only warp with 2x2 or 3x3 matrix";f.call(this,a.matrixWarp,{matrix:d?y(b):b,texSize:[this.width,this.height],useTextureSpace:c|0});return this}function aa(a,d){var c=x.apply(null,d),e=x.apply(null,a),c=y(c);return this.matrixWarp([c[0]*e[0]+c[1]*e[3]+c[2]*e[6],c[0]*e[1]+c[1]*e[4]+c[2]*e[7],c[0]*e[2]+c[1]*e[5]+c[2]*e[8],c[3]*e[0]+c[4]*e[3]+c[5]*e[6],c[3]*e[1]+c[4]*e[4]+c[5]*e[7],c[3]*e[2]+c[4]*e[5]+c[5]*e[8],c[6]*e[0]+c[7]*e[3]+c[8]*e[6],
+c[6]*e[1]+c[7]*e[4]+c[8]*e[7],c[6]*e[2]+c[7]*e[5]+c[8]*e[8]])}function ba(b,d,c,e){a.swirl=a.swirl||u("uniform float radius;uniform float angle;uniform vec2 center;","coord-=center;float distance=length(coord);if(distance<radius){float percent=(radius-distance)/radius;float theta=percent*percent*angle;float s=sin(theta);float c=cos(theta);coord=vec2(coord.x*c-coord.y*s,coord.x*s+coord.y*c);}coord+=center;");
+f.call(this,a.swirl,{radius:c,center:[b,d],angle:e,texSize:[this.width,this.height]});return this}var v={};(function(){function a(b){if(!b.getExtension("OES_texture_float"))return!1;var c=b.createFramebuffer(),e=b.createTexture();b.bindTexture(b.TEXTURE_2D,e);b.texParameteri(b.TEXTURE_2D,b.TEXTURE_MAG_FILTER,b.NEAREST);b.texParameteri(b.TEXTURE_2D,b.TEXTURE_MIN_FILTER,b.NEAREST);b.texParameteri(b.TEXTURE_2D,b.TEXTURE_WRAP_S,b.CLAMP_TO_EDGE);b.texParameteri(b.TEXTURE_2D,b.TEXTURE_WRAP_T,b.CLAMP_TO_EDGE);
+b.texImage2D(b.TEXTURE_2D,0,b.RGBA,1,1,0,b.RGBA,b.UNSIGNED_BYTE,null);b.bindFramebuffer(b.FRAMEBUFFER,c);b.framebufferTexture2D(b.FRAMEBUFFER,b.COLOR_ATTACHMENT0,b.TEXTURE_2D,e,0);c=b.createTexture();b.bindTexture(b.TEXTURE_2D,c);b.texParameteri(b.TEXTURE_2D,b.TEXTURE_MAG_FILTER,b.LINEAR);b.texParameteri(b.TEXTURE_2D,b.TEXTURE_MIN_FILTER,b.LINEAR);b.texParameteri(b.TEXTURE_2D,b.TEXTURE_WRAP_S,b.CLAMP_TO_EDGE);b.texParameteri(b.TEXTURE_2D,b.TEXTURE_WRAP_T,b.CLAMP_TO_EDGE);b.texImage2D(b.TEXTURE_2D,
+0,b.RGBA,2,2,0,b.RGBA,b.FLOAT,new Float32Array([2,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]));var e=b.createProgram(),d=b.createShader(b.VERTEX_SHADER),g=b.createShader(b.FRAGMENT_SHADER);b.shaderSource(d,"attribute vec2 vertex;void main(){gl_Position=vec4(vertex,0.0,1.0);}");b.shaderSource(g,"uniform sampler2D texture;void main(){gl_FragColor=texture2D(texture,vec2(0.5));}");b.compileShader(d);b.compileShader(g);b.attachShader(e,d);b.attachShader(e,
+g);b.linkProgram(e);d=b.createBuffer();b.bindBuffer(b.ARRAY_BUFFER,d);b.bufferData(b.ARRAY_BUFFER,new Float32Array([0,0]),b.STREAM_DRAW);b.enableVertexAttribArray(0);b.vertexAttribPointer(0,2,b.FLOAT,!1,0,0);d=new Uint8Array(4);b.useProgram(e);b.viewport(0,0,1,1);b.bindTexture(b.TEXTURE_2D,c);b.drawArrays(b.POINTS,0,1);b.readPixels(0,0,1,1,b.RGBA,b.UNSIGNED_BYTE,d);return 127===d[0]||128===d[0]}function d(){}function c(a){"OES_texture_float_linear"===a?(void 0===this.$OES_texture_float_linear$&&Object.defineProperty(this,
+"$OES_texture_float_linear$",{enumerable:!1,configurable:!1,writable:!1,value:new d}),a=this.$OES_texture_float_linear$):a=n.call(this,a);return a}function e(){var a=f.call(this);-1===a.indexOf("OES_texture_float_linear")&&a.push("OES_texture_float_linear");return a}try{var g=document.createElement("canvas").getContext("experimental-webgl")}catch(l){}if(g&&-1===g.getSupportedExtensions().indexOf("OES_texture_float_linear")&&a(g)){var n=WebGLRenderingContext.prototype.getExtension,f=WebGLRenderingContext.prototype.getSupportedExtensions;
+WebGLRenderingContext.prototype.getExtension=c;WebGLRenderingContext.prototype.getSupportedExtensions=e}})();var a;v.canvas=function(){var b=document.createElement("canvas");try{a=b.getContext("experimental-webgl",{premultipliedAlpha:!1})}catch(d){a=null}if(!a)throw"This browser does not support WebGL";b._={gl:a,isInitialized:!1,texture:null,spareTexture:null,flippedShader:null};b.texture=k(A);b.draw=k(C);b.update=k(D);b.replace=k(E);b.contents=k(F);b.getPixelArray=k(G);b.brightnessContrast=k(H);
+b.hexagonalPixelate=k(X);b.hueSaturation=k(K);b.colorHalftone=k(U);b.triangleBlur=k(S);b.unsharpMask=k(N);b.perspective=k(aa);b.matrixWarp=k($);b.bulgePinch=k(Z);b.tiltShift=k(R);b.dotScreen=k(V);b.edgeWork=k(W);b.lensBlur=k(Q);b.zoomBlur=k(T);b.noise=k(L);b.denoise=k(J);b.curves=k(I);b.swirl=k(ba);b.ink=k(Y);b.vignette=k(P);b.vibrance=k(O);b.sepia=k(M);return b};v.splineInterpolate=t;var h=function(){function b(b,c){var e=a.createShader(b);a.shaderSource(e,c);a.compileShader(e);if(!a.getShaderParameter(e,
+a.COMPILE_STATUS))throw"compile error: "+a.getShaderInfoLog(e);return e}function d(d,l){this.texCoordAttribute=this.vertexAttribute=null;this.program=a.createProgram();d=d||c;l=l||e;l="precision highp float;"+l;a.attachShader(this.program,b(a.VERTEX_SHADER,d));a.attachShader(this.program,b(a.FRAGMENT_SHADER,l));a.linkProgram(this.program);if(!a.getProgramParameter(this.program,a.LINK_STATUS))throw"link error: "+a.getProgramInfoLog(this.program);}var c="attribute vec2 vertex;attribute vec2 _texCoord;varying vec2 texCoord;void main(){texCoord=_texCoord;gl_Position=vec4(vertex*2.0-1.0,0.0,1.0);}",
+e="uniform sampler2D texture;varying vec2 texCoord;void main(){gl_FragColor=texture2D(texture,texCoord);}";d.prototype.destroy=function(){a.deleteProgram(this.program);this.program=null};d.prototype.uniforms=function(b){a.useProgram(this.program);for(var e in b)if(b.hasOwnProperty(e)){var c=a.getUniformLocation(this.program,e);if(null!==c){var d=b[e];if("[object Array]"==Object.prototype.toString.call(d))switch(d.length){case 1:a.uniform1fv(c,new Float32Array(d));break;
+case 2:a.uniform2fv(c,new Float32Array(d));break;case 3:a.uniform3fv(c,new Float32Array(d));break;case 4:a.uniform4fv(c,new Float32Array(d));break;case 9:a.uniformMatrix3fv(c,!1,new Float32Array(d));break;case 16:a.uniformMatrix4fv(c,!1,new Float32Array(d));break;default:throw"dont't know how to load uniform \""+e+'" of length '+d.length;}else if("[object Number]"==Object.prototype.toString.call(d))a.uniform1f(c,d);else throw'attempted to set uniform "'+e+'" to invalid value '+(d||"undefined").toString();
+}}return this};d.prototype.textures=function(b){a.useProgram(this.program);for(var c in b)b.hasOwnProperty(c)&&a.uniform1i(a.getUniformLocation(this.program,c),b[c]);return this};d.prototype.drawRect=function(b,c,e,d){var f=a.getParameter(a.VIEWPORT);c=void 0!==c?(c-f[1])/f[3]:0;b=void 0!==b?(b-f[0])/f[2]:0;e=void 0!==e?(e-f[0])/f[2]:1;d=void 0!==d?(d-f[1])/f[3]:1;null==a.vertexBuffer&&(a.vertexBuffer=a.createBuffer());a.bindBuffer(a.ARRAY_BUFFER,a.vertexBuffer);a.bufferData(a.ARRAY_BUFFER,new Float32Array([b,
+c,b,d,e,c,e,d]),a.STATIC_DRAW);null==a.texCoordBuffer&&(a.texCoordBuffer=a.createBuffer(),a.bindBuffer(a.ARRAY_BUFFER,a.texCoordBuffer),a.bufferData(a.ARRAY_BUFFER,new Float32Array([0,0,0,1,1,0,1,1]),a.STATIC_DRAW));null==this.vertexAttribute&&(this.vertexAttribute=a.getAttribLocation(this.program,"vertex"),a.enableVertexAttribArray(this.vertexAttribute));null==this.texCoordAttribute&&(this.texCoordAttribute=a.getAttribLocation(this.program,"_texCoord"),a.enableVertexAttribArray(this.texCoordAttribute));
+a.useProgram(this.program);a.bindBuffer(a.ARRAY_BUFFER,a.vertexBuffer);a.vertexAttribPointer(this.vertexAttribute,2,a.FLOAT,!1,0,0);a.bindBuffer(a.ARRAY_BUFFER,a.texCoordBuffer);a.vertexAttribPointer(this.texCoordAttribute,2,a.FLOAT,!1,0,0);a.drawArrays(a.TRIANGLE_STRIP,0,4)};d.getDefaultShader=function(){a.defaultShader=a.defaultShader||new d;return a.defaultShader};return d}();z.prototype.interpolate=function(a){for(var d=0,c=this.ya.length-1;1<c-d;){var e=c+d>>1;this.xa[e]>a?c=e:d=e}var e=this.xa[c]-
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+a.TEXTURE_WRAP_T,a.CLAMP_TO_EDGE);b&&c&&a.texImage2D(a.TEXTURE_2D,0,this.format,b,c,0,this.format,this.type,null)}function d(a){null==c&&(c=document.createElement("canvas"));c.width=a.width;c.height=a.height;a=c.getContext("2d");a.clearRect(0,0,c.width,c.height);return a}b.fromElement=function(c){var d=new b(0,0,a.RGBA,a.UNSIGNED_BYTE);d.loadContentsOf(c);return d};b.prototype.loadContentsOf=function(b){this.width=b.width||b.videoWidth;this.height=b.height||b.videoHeight;a.bindTexture(a.TEXTURE_2D,
+this.id);a.texImage2D(a.TEXTURE_2D,0,this.format,this.format,this.type,b)};b.prototype.initFromBytes=function(b,c,d){this.width=b;this.height=c;this.format=a.RGBA;this.type=a.UNSIGNED_BYTE;a.bindTexture(a.TEXTURE_2D,this.id);a.texImage2D(a.TEXTURE_2D,0,a.RGBA,b,c,0,a.RGBA,this.type,new Uint8Array(d))};b.prototype.destroy=function(){a.deleteTexture(this.id);this.id=null};b.prototype.use=function(b){a.activeTexture(a.TEXTURE0+(b||0));a.bindTexture(a.TEXTURE_2D,this.id)};b.prototype.unuse=function(b){a.activeTexture(a.TEXTURE0+
+(b||0));a.bindTexture(a.TEXTURE_2D,null)};b.prototype.ensureFormat=function(b,c,d,f){if(1==arguments.length){var h=arguments[0];b=h.width;c=h.height;d=h.format;f=h.type}if(b!=this.width||c!=this.height||d!=this.format||f!=this.type)this.width=b,this.height=c,this.format=d,this.type=f,a.bindTexture(a.TEXTURE_2D,this.id),a.texImage2D(a.TEXTURE_2D,0,this.format,b,c,0,this.format,this.type,null)};b.prototype.drawTo=function(b){a.framebuffer=a.framebuffer||a.createFramebuffer();a.bindFramebuffer(a.FRAMEBUFFER,
+a.framebuffer);a.framebufferTexture2D(a.FRAMEBUFFER,a.COLOR_ATTACHMENT0,a.TEXTURE_2D,this.id,0);if(a.checkFramebufferStatus(a.FRAMEBUFFER)!==a.FRAMEBUFFER_COMPLETE)throw Error("incomplete framebuffer");a.viewport(0,0,this.width,this.height);b();a.bindFramebuffer(a.FRAMEBUFFER,null)};var c=null;b.prototype.fillUsingCanvas=function(b){b(d(this));this.format=a.RGBA;this.type=a.UNSIGNED_BYTE;a.bindTexture(a.TEXTURE_2D,this.id);a.texImage2D(a.TEXTURE_2D,0,a.RGBA,a.RGBA,a.UNSIGNED_BYTE,c);return this};
+b.prototype.toImage=function(b){this.use();h.getDefaultShader().drawRect();var f=4*this.width*this.height,k=new Uint8Array(f),n=d(this),p=n.createImageData(this.width,this.height);a.readPixels(0,0,this.width,this.height,a.RGBA,a.UNSIGNED_BYTE,k);for(var m=0;m<f;m++)p.data[m]=k[m];n.putImageData(p,0,0);b.src=c.toDataURL()};b.prototype.swapWith=function(a){var b;b=a.id;a.id=this.id;this.id=b;b=a.width;a.width=this.width;this.width=b;b=a.height;a.height=this.height;this.height=b;b=a.format;a.format=
+this.format;this.format=b};return b}(),s="float random(vec3 scale,float seed){return fract(sin(dot(gl_FragCoord.xyz+seed,scale))*43758.5453+seed);}";return v}();
diff --git a/Websites/webkit.org/blog-files/webrtc/pc-with-effects/index.html b/Websites/webkit.org/blog-files/webrtc/pc-with-effects/index.html
new file mode 100644 (file)
index 0000000..bb8b950
--- /dev/null
@@ -0,0 +1,48 @@
+<!DOCTYPE html>
+<!--
+ *  Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree.
+-->
+<html>
+<head>
+
+  <meta charset="utf-8">
+  <meta name="description" content="A zest of canvas capture and replaceTrack">
+  <meta name="viewport" content="width=device-width, user-scalable=yes, initial-scale=1, maximum-scale=1">
+
+  <title>A zest of canvas capture and replaceTrack</title>
+
+  <link rel="stylesheet" href="main.css" />
+
+</head>
+
+<body>
+
+  <h1>A zest of canvas capture and replaceTrack</h1>
+  <h2>Inspired by well-known <a href="//webrtc.github.io/samples/" title="WebRTC samples homepage">WebRTC samples</a></h2>
+
+  <video id="localVideo" autoplay muted playsInline></video>
+  <br>
+  <video id="remoteVideo" autoplay playsInline></video>
+
+  <div>
+    <button id="startButton">Start</button>
+    <button id="callButton">Call</button>
+  </div>
+
+  <p>This page illustrates use of the canvas capture and replaceTrack.
+  To add spice to this typical WebRTC video exchange, the camera video track (displayed in the first video element) is sent to a canvas.
+  Some processing is done to pixellate it in the canvas.
+  The canvas stream is captured and sent to the second video element through WebRTC.
+  The pixellation will slowly decrease up to no pixellation at all.
+  Once there is no more pixellation, the canvas capture track will be replaced by the camera video track to optimize the performaces.
+  </p>
+
+  <script src="https://webrtc.github.io/adapter/adapter-latest.js"></script>
+  <script src="glfx.js"></script>
+  <script src="main.js"></script>
+</body>
+</html>
diff --git a/Websites/webkit.org/blog-files/webrtc/pc-with-effects/main.css b/Websites/webkit.org/blog-files/webrtc/pc-with-effects/main.css
new file mode 100644 (file)
index 0000000..3b01516
--- /dev/null
@@ -0,0 +1,49 @@
+/*
+ *  Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree.
+ */
+
+a {
+  text-decoration: none;
+}
+
+a:hover {
+  text-decoration: underline;
+}
+
+audio {
+  max-width: 100%;
+}
+
+canvas {
+  background-color: #ccc;
+  max-width: 100%;
+  width: 100%;
+}
+
+video {
+  background: #222;
+  width: 640px;
+  margin: 0 0 20px 0;
+  vertical-align: top;
+}
+
+button {
+  margin: 0 20px 0 0;
+  width: 83px;
+}
+
+@media screen and (max-width: 400px) {
+  button {
+    width: 83px;
+    margin: 0 11px 10px 0;
+  }
+
+  video {
+    width: 320px;
+    margin: 0 0 10px 0;
+  }
+}
diff --git a/Websites/webkit.org/blog-files/webrtc/pc-with-effects/main.js b/Websites/webkit.org/blog-files/webrtc/pc-with-effects/main.js
new file mode 100644 (file)
index 0000000..700fa4c
--- /dev/null
@@ -0,0 +1,274 @@
+/*
+ *  Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree.
+ */
+
+'use strict';
+
+var startButton = document.getElementById('startButton');
+var callButton = document.getElementById('callButton');
+callButton.disabled = true;
+startButton.onclick = start;
+callButton.onclick = call;
+
+var startTime;
+var localVideo = document.getElementById('localVideo');
+var remoteVideo = document.getElementById('remoteVideo');
+var canvas = fx.canvas();
+
+localVideo.addEventListener('loadedmetadata', function() {
+  trace('Local video videoWidth: ' + this.videoWidth +
+    'px,  videoHeight: ' + this.videoHeight + 'px');
+});
+
+remoteVideo.addEventListener('loadedmetadata', function() {
+  trace('Remote video videoWidth: ' + this.videoWidth +
+    'px,  videoHeight: ' + this.videoHeight + 'px');
+});
+
+remoteVideo.onresize = function() {
+  trace('Remote video size changed to ' +
+    remoteVideo.videoWidth + 'x' + remoteVideo.videoHeight);
+  // We'll use the first onsize callback as an indication that video has started
+  // playing out.
+  if (startTime) {
+    var elapsedTime = window.performance.now() - startTime;
+    trace('Setup time: ' + elapsedTime.toFixed(3) + 'ms');
+    startTime = null;
+  }
+};
+
+var localStream;
+var pc1;
+var pc2;
+var offerOptions = {
+  offerToReceiveAudio: 1,
+  offerToReceiveVideo: 1
+};
+
+function getName(pc) {
+  return (pc === pc1) ? 'pc1' : 'pc2';
+}
+
+function getOtherPc(pc) {
+  return (pc === pc1) ? pc2 : pc1;
+}
+
+function gotStream(stream) {
+  trace('Received local stream');
+  localVideo.srcObject = stream;
+  localStream = stream;
+  callButton.disabled = false;
+}
+
+function start() {
+  trace('Requesting local stream');
+  startButton.disabled = true;
+  navigator.mediaDevices.getUserMedia({
+    audio: false,
+    video: true})
+  .then(gotStream)
+  .catch(function(e) {
+    alert('getUserMedia() error: ' + e);
+  });
+}
+
+function call() {
+  callButton.disabled = true;
+  trace('Starting call');
+  startTime = window.performance.now();
+  var videoTracks = localStream.getVideoTracks();
+  var audioTracks = localStream.getAudioTracks();
+  if (videoTracks.length > 0) {
+    trace('Using video device: ' + videoTracks[0].label);
+  }
+  if (audioTracks.length > 0) {
+    trace('Using audio device: ' + audioTracks[0].label);
+  }
+  var servers = null;
+  pc1 = new RTCPeerConnection(servers);
+  trace('Created local peer connection object pc1');
+  pc1.onicecandidate = function(e) {
+    onIceCandidate(pc1, e);
+  };
+  pc2 = new RTCPeerConnection(servers);
+  trace('Created remote peer connection object pc2');
+  pc2.onicecandidate = function(e) {
+    onIceCandidate(pc2, e);
+  };
+  pc1.oniceconnectionstatechange = function(e) {
+    onIceStateChange(pc1, e);
+  };
+  pc2.oniceconnectionstatechange = function(e) {
+    onIceStateChange(pc2, e);
+  };
+  pc2.ontrack = gotRemoteTrack;
+
+  startUsingDiscreetMode();
+  pc1.addTrack(canvasVideoStream.getVideoTracks()[0], canvasVideoStream);
+  trace('Added local stream to pc1');
+
+  trace('pc1 createOffer start');
+  pc1.createOffer(
+    offerOptions
+  ).then(
+    onCreateOfferSuccess,
+    onCreateSessionDescriptionError
+  );
+}
+
+function onCreateSessionDescriptionError(error) {
+  trace('Failed to create session description: ' + error.toString());
+}
+
+function onCreateOfferSuccess(desc) {
+  trace('Offer from pc1\n' + desc.sdp);
+  trace('pc1 setLocalDescription start');
+  pc1.setLocalDescription(desc).then(
+    function() {
+      onSetLocalSuccess(pc1);
+    },
+    onSetSessionDescriptionError
+  );
+  trace('pc2 setRemoteDescription start');
+  pc2.setRemoteDescription(desc).then(
+    function() {
+      onSetRemoteSuccess(pc2);
+    },
+    onSetSessionDescriptionError
+  );
+  trace('pc2 createAnswer start');
+  // Since the 'remote' side has no media stream we need
+  // to pass in the right constraints in order for it to
+  // accept the incoming offer of audio and video.
+  pc2.createAnswer().then(
+    onCreateAnswerSuccess,
+    onCreateSessionDescriptionError
+  );
+}
+
+function onSetLocalSuccess(pc) {
+  trace(getName(pc) + ' setLocalDescription complete');
+}
+
+function onSetRemoteSuccess(pc) {
+  trace(getName(pc) + ' setRemoteDescription complete');
+}
+
+function onSetSessionDescriptionError(error) {
+  trace('Failed to set session description: ' + error.toString());
+}
+
+function gotRemoteTrack(e) {
+  remoteVideo.srcObject = e.streams[0];
+  trace('pc2 received remote track');
+}
+
+function onCreateAnswerSuccess(desc) {
+  trace('Answer from pc2:\n' + desc.sdp);
+  trace('pc2 setLocalDescription start');
+  pc2.setLocalDescription(desc).then(
+    function() {
+      onSetLocalSuccess(pc2);
+    },
+    onSetSessionDescriptionError
+  );
+  trace('pc1 setRemoteDescription start');
+  pc1.setRemoteDescription(desc).then(
+    function() {
+      onSetRemoteSuccess(pc1);
+    },
+    onSetSessionDescriptionError
+  );
+}
+
+function onIceCandidate(pc, event) {
+  getOtherPc(pc).addIceCandidate(event.candidate)
+  .then(
+    function() {
+      onAddIceCandidateSuccess(pc);
+    },
+    function(err) {
+      onAddIceCandidateError(pc, err);
+    }
+  );
+  trace(getName(pc) + ' ICE candidate: \n' + (event.candidate ?
+      event.candidate.candidate : '(null)'));
+}
+
+function onAddIceCandidateSuccess(pc) {
+  trace(getName(pc) + ' addIceCandidate success');
+}
+
+function onAddIceCandidateError(pc, error) {
+  trace(getName(pc) + ' failed to add ICE Candidate: ' + error.toString());
+}
+
+function onIceStateChange(pc, event) {
+  if (pc) {
+    trace(getName(pc) + ' ICE state: ' + pc.iceConnectionState);
+    console.log('ICE state change event: ', event);
+  }
+}
+
+var canvasVideoStream;
+var drawCanvas = false;
+var hexagonSize = 30;
+function videoToCanvas()
+{
+    var texture = canvas.texture(localVideo);
+    canvas.draw(texture).hexagonalPixelate(320, 239.5, hexagonSize).update();
+    if (drawCanvas)
+        window.requestAnimationFrame(videoToCanvas);
+}
+
+var isUpdatingHexagonSize = false;
+function updateHexagonSize()
+{
+    if (!isUpdatingHexagonSize)
+        return;
+    if (hexagonSize <= 1) {
+        stopUsingDiscreetMode();
+        isUpdatingHexagonSize = false;
+        return;
+    }
+    hexagonSize--;
+    setTimeout(updateHexagonSize, 300);
+}
+
+function startUsingDiscreetMode()
+{
+    hexagonSize = 30;
+    if (!canvasVideoStream)
+        canvasVideoStream = canvas.captureStream();
+
+    if (!drawCanvas) {
+        drawCanvas = true;
+        videoToCanvas();
+    }
+
+    if (!isUpdatingHexagonSize) {
+        isUpdatingHexagonSize = true;
+        updateHexagonSize();
+    }
+}
+
+function stopUsingDiscreetMode()
+{
+    for(var sender of pc1.getSenders()) {
+        if (sender.track.kind === "video") {
+            sender.replaceTrack(localStream.getVideoTracks()[0]);
+            return;
+        }
+    }
+}
+
+function trace(arg) {
+  var now = (window.performance.now() / 1000).toFixed(3);
+  console.log(now + ': ', arg);
+}
+
+