Reduce memory consumption by using smaller video resolution

phonegap · Aug 8, 2016 · 89a9c69 · 89a9c69
1 parent 3cf975b
commit 89a9c69
Showing 1 changed file with 12 additions and 4 deletions.
diff --git a/src/windows/BarcodeScannerProxy.js b/src/windows/BarcodeScannerProxy.js
@@ -155,6 +155,7 @@ BarcodeReader.prototype.init = function (capture, width, height) {
     this._width = width;
     this._height = height;
     this._zxingReader = new ZXing.BarcodeReader();
+    this._zxingReader.tryHarder = true;
 };
 
 /**
@@ -399,7 +400,7 @@ module.exports = {
 
             focusControl.configure(focusConfig);
 
-            // Continuous focus should start only after preview has started. See 'Remarks' at 
+            // Continuous focus should start only after preview has started. See 'Remarks' at
             // https://msdn.microsoft.com/en-us/library/windows/apps/windows.media.devices.focuscontrol.configure.aspx
             function waitForIsPlaying() {
                 var isPlaying = !capturePreview.paused && !capturePreview.ended && capturePreview.readyState > 2;
@@ -444,7 +445,7 @@ module.exports = {
             .then(function () {
 
                 var controller = capture.videoDeviceController;
-                var deviceProps = controller.getAvailableMediaStreamProperties(Windows.Media.Capture.MediaStreamType.videoRecord);
+                var deviceProps = controller.getAvailableMediaStreamProperties(Windows.Media.Capture.MediaStreamType.videoPreview);
 
                 deviceProps = Array.prototype.slice.call(deviceProps);
                 deviceProps = deviceProps.filter(function (prop) {
@@ -455,8 +456,15 @@ module.exports = {
                     return propB.width - propA.width;
                 });
 
-                var maxResProps = deviceProps[0];
-                return controller.setMediaStreamPropertiesAsync(Windows.Media.Capture.MediaStreamType.videoRecord, maxResProps)
+                var preferredProps = deviceProps.filter(function(prop){
+                    // Filter out props where frame size is between 640*480 and 1280*720
+                    return prop.width >= 640 && prop.height >= 480 && prop.width <= 1280 && prop.height <= 720;
+                });
+
+                // prefer video frame size between between 640*480 and 1280*720
+                // use maximum resolution otherwise
+                var maxResProps = preferredProps[0] || deviceProps[0];
+                return controller.setMediaStreamPropertiesAsync(Windows.Media.Capture.MediaStreamType.videoPreview, maxResProps)
                 .then(function () {
                     return {
                         capture: capture,