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Code Issues Releases Wiki Activity

Shinobi CE officially lands on Gitlab

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Moe 2018-06-07 23:21:38 -07:00
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tools/ffmpegToWeb/Player/broadway/canvas/YUVCanvas.js Normal file
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"use strict";
var Class = require('uclass');
var YUVCanvas = new Class({
Binds : ['decode'],
initialize : function(canvas, size) {
this.canvas = canvas;
this.canvasCtx = this.canvas.getContext("2d");
this.canvasBuffer = this.canvasCtx.createImageData(size.w, size.h);
},
decode : function (buffer, width, height) {
if (!buffer)
return;
var lumaSize = width * height;
var chromaSize = lumaSize >> 2;
var ybuf = buffer.subarray(0, lumaSize);
var ubuf = buffer.subarray(lumaSize, lumaSize + chromaSize);
var vbuf = buffer.subarray(lumaSize + chromaSize, lumaSize + 2 * chromaSize);
for (var y = 0; y < height; y++) {
for (var x = 0; x < width; x++) {
var yIndex = x + y * width;
var uIndex = ~~(y / 2) * ~~(width / 2) + ~~(x / 2);
var vIndex = ~~(y / 2) * ~~(width / 2) + ~~(x / 2);
var R = 1.164 * (ybuf[yIndex] - 16) + 1.596 * (vbuf[vIndex] - 128);
var G = 1.164 * (ybuf[yIndex] - 16) - 0.813 * (vbuf[vIndex] - 128) - 0.391 * (ubuf[uIndex] - 128);
var B = 1.164 * (ybuf[yIndex] - 16) + 2.018 * (ubuf[uIndex] - 128);
var rgbIndex = yIndex * 4;
this.canvasBuffer.data[rgbIndex+0] = R;
this.canvasBuffer.data[rgbIndex+1] = G;
this.canvasBuffer.data[rgbIndex+2] = B;
this.canvasBuffer.data[rgbIndex+3] = 0xff;
}
}
this.canvasCtx.putImageData(this.canvasBuffer, 0, 0);
var date = new Date();
//console.log("WSAvcPlayer: Decode time: " + (date.getTime() - this.rcvtime) + " ms");
},
});
module.exports = YUVCanvas;