* @private * @param {HTMLVideoElement} video * @return {Boolean}
(video)
| 242 | * @return {Boolean} |
| 243 | */ |
| 244 | function _detectVideoSignal(video){ |
| 245 | var canvas = document.createElement('canvas'), ctx, res = false; |
| 246 | try { |
| 247 | ctx = canvas.getContext('2d'); |
| 248 | ctx.drawImage(video, 0, 0, 1, 1); |
| 249 | res = ctx.getImageData(0, 0, 1, 1).data[4] != 255; |
| 250 | } |
| 251 | catch( err ){ |
| 252 | api.log('[FileAPI.Camera] detectVideoSignal:', err); |
| 253 | } |
| 254 | return res; |
| 255 | } |
| 256 | |
| 257 | |
| 258 | // @export |