Linked config-view to scanner

src/input/camera_access.js

@@ -1,4 +1,4 @@
-import {merge, pick} from 'lodash';
+import {merge, pick, omit} from 'lodash';
 
 var streamRef;
 
@@ -64,7 +64,14 @@ function deprecatedConstraints(videoConstraints) {
 }
 
 function applyCameraFacing(facing, constraints) {
-    if (typeof constraints.video.deviceId !== 'undefined' || !facing){
+    if (typeof constraints.video.deviceId === 'string' && constraints.video.deviceId.length > 0) {
+        return Promise.resolve({
+            ...constraints,
+            video: {
+                ...omit(constraints.video, "facingMode")
+            }
+        });
+    } else if (!facing) {
         return Promise.resolve(constraints);
     }
     if ( typeof MediaStreamTrack !== 'undefined' &&

src/quagga.js

@@ -8,8 +8,7 @@ import Config from './config/config';
 import {merge} from 'lodash';
 import {createConfigFromSource} from './input/config_factory';
 
-function fromSource(config, source, inputConfig = {}) {
-    config = createConfigFromSource(config, inputConfig, source);
+function fromConfig(config) {
     const scanner = createScanner();
     return {
         addEventListener(eventType, cb) {
@@ -73,6 +72,11 @@ function fromSource(config, source, inputConfig = {}) {
     };
 }
 
+function fromSource(config, source, inputConfig = {}) {
+    config = createConfigFromSource(config, inputConfig, source);
+    return fromConfig(config);
+}
+
 const defaultScanner = createScanner();
 
 function setConfig(configuration = {}, key, config = {}) {
@@ -85,6 +89,9 @@ function createApi(configuration = Config) {
         fromSource(src, inputConfig) {
             return fromSource(configuration, src, inputConfig);
         },
+        fromConfig(conf) {
+            return createApi(merge({}, configuration, conf));
+        },
         decoder(conf) {
             return setConfig(configuration, "decoder", conf);
         },

src/scanner.js

@@ -296,7 +296,7 @@ function createScanner() {
 
     function startContinuousUpdate() {
         var next = null,
-            delay = 1000 / (_config.frequency || 60);
+            delay = 1000 / (_config.frequency === 0 ? 60 : (_config.frequency || 60));
 
         _stopped = false;
         (function frame(timestamp) {