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Using the ZBar C-library in WebAssembly to build a browser-based multi-barcode detector

HTML 51.35% JavaScript 13.65% C 35.00%

webassembly zbar barcode-scanner emscripten

barcode-scanner-webassembly's Introduction

Code to accompany my post "Using the ZBar barcode scanning suite in the browser with WebAssembly".

barcode-scanner-webassembly's People

Stargazers

Watchers

Forkers

lulzzz indraone01 hadleyrich vichikhy quijoteshin davidnussio avilaj ezerway 2qx amarildolacerda jordimurgo vmark99 renowncoder faridsanusi devdoshi johnhenga tcheredeev library-develop daminuxfork

barcode-scanner-webassembly's Issues

memory leak issue

It is very nice for scanning using web assembly and very helpful repository, thanks for sharing.

However, I came across following scenario, please read,
when running demo sample application from iPad, it keeps adding memory and at certain point page gets crashed. It clearly gets noticed in iPad, however in Chrome it shows memory getting increased and after some memory limit, chrome also shows crash behavior.

please suggest or improve the memory management.

The in browser demo runs very slow in mobile phone browser.

The demo works perfectly fine in the laptop browser but in mobile phone browser its lagging too much. I tried optimizing by using service workers but couldn't see much improvement.
Are there any ways to improve the performance in the mobile browser?

index.html:26 Uncaught ReferenceError: Module is not defined

since there is no a.out.js it giving an error "index.html:26 Uncaught ReferenceError: Module is not defined"

UTF8ToString Error

Executed everything exactly in the same manner when a qr code is shown in front of the camera Getting the following error:

Uncaught abort("this function has been removed - you should use UTF8ToString(ptr, maxBytesToRead) instead!"). Build with -s ASSERTIONS=1 for more info.
push../node_modules/zone.js/dist/zone.js.Zone.runTask @ zone.js:192
push../node_modules/zone.js/dist/zone.js.ZoneTask.invokeTask @ zone.js:496
ZoneTask.invoke @ zone.js:485
timer @ zone.js:2054
setInterval (async)
scheduleTask @ zone.js:2075
push../node_modules/zone.js/dist/zone.js.ZoneDelegate.scheduleTask @ zone.js:407
push../node_modules/zone.js/dist/zone.js.Zone.scheduleTask @ zone.js:232
push../node_modules/zone.js/dist/zone.js.Zone.scheduleMacroTask @ zone.js:255
scheduleMacroTaskWithCurrentZone @ zone.js:1114
(anonymous) @ zone.js:2090
proto.(anonymous function) @ zone.js:1394
navigator.mediaDevices.getUserMedia.then @ list:86
push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invoke @ zone.js:388
push../node_modules/zone.js/dist/zone.js.Zone.run @ zone.js:138
(anonymous) @ zone.js:872
push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invokeTask @ zone.js:421
push../node_modules/zone.js/dist/zone.js.Zone.runTask @ zone.js:188
drainMicroTaskQueue @ zone.js:595
Promise.then (async)
scheduleMicroTask @ zone.js:578
push../node_modules/zone.js/dist/zone.js.ZoneDelegate.scheduleTask @ zone.js:410
push../node_modules/zone.js/dist/zone.js.Zone.scheduleTask @ zone.js:232
push../node_modules/zone.js/dist/zone.js.Zone.scheduleMicroTask @ zone.js:252
scheduleResolveOrReject @ zone.js:862
resolvePromise @ zone.js:808
(anonymous) @ zone.js:724
Promise.then (async)
(anonymous) @ zone.js:1042
ZoneAwarePromise @ zone.js:891
Ctor.then @ zone.js:1041
Module.onRuntimeInitialized @ list:73
doRun @ a.out.js:1
run @ a.out.js:1
runCaller @ a.out.js:1
removeRunDependency @ a.out.js:1
receiveInstance @ a.out.js:1
receiveInstantiatedSource @ a.out.js:1
push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invoke @ zone.js:388
push../node_modules/zone.js/dist/zone.js.Zone.run @ zone.js:138
(anonymous) @ zone.js:872
push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invokeTask @ zone.js:421
push../node_modules/zone.js/dist/zone.js.Zone.runTask @ zone.js:188
drainMicroTaskQueue @ zone.js:595
Promise.then (async)
scheduleMicroTask @ zone.js:578
push../node_modules/zone.js/dist/zone.js.ZoneDelegate.scheduleTask @ zone.js:410
push../node_modules/zone.js/dist/zone.js.Zone.scheduleTask @ zone.js:232
push../node_modules/zone.js/dist/zone.js.Zone.scheduleMicroTask @ zone.js:252
scheduleResolveOrReject @ zone.js:862
resolvePromise @ zone.js:808
(anonymous) @ zone.js:724
Promise.then (async)
(anonymous) @ zone.js:1042
ZoneAwarePromise @ zone.js:891
Ctor.then @ zone.js:1041
createWasm @ a.out.js:1
Module.asm @ a.out.js:1
(anonymous) @ a.out.js:1

After Some time getting this error

Uncaught abort("OOM"). Build with -s ASSERTIONS=1 for more info.
push../node_modules/zone.js/dist/zone.js.Zone.runTask @ zone.js:192
push../node_modules/zone.js/dist/zone.js.ZoneTask.invokeTask @ zone.js:496
ZoneTask.invoke @ zone.js:485
timer @ zone.js:2054
setInterval (async)
scheduleTask @ zone.js:2075
push../node_modules/zone.js/dist/zone.js.ZoneDelegate.scheduleTask @ zone.js:407
push../node_modules/zone.js/dist/zone.js.Zone.scheduleTask @ zone.js:232
push../node_modules/zone.js/dist/zone.js.Zone.scheduleMacroTask @ zone.js:255
scheduleMacroTaskWithCurrentZone @ zone.js:1114
(anonymous) @ zone.js:2090
proto.(anonymous function) @ zone.js:1394
navigator.mediaDevices.getUserMedia.then @ list:86
push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invoke @ zone.js:388
push../node_modules/zone.js/dist/zone.js.Zone.run @ zone.js:138
(anonymous) @ zone.js:872
push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invokeTask @ zone.js:421
push../node_modules/zone.js/dist/zone.js.Zone.runTask @ zone.js:188
drainMicroTaskQueue @ zone.js:595
Promise.then (async)
scheduleMicroTask @ zone.js:578
push../node_modules/zone.js/dist/zone.js.ZoneDelegate.scheduleTask @ zone.js:410
push../node_modules/zone.js/dist/zone.js.Zone.scheduleTask @ zone.js:232
push../node_modules/zone.js/dist/zone.js.Zone.scheduleMicroTask @ zone.js:252
scheduleResolveOrReject @ zone.js:862
resolvePromise @ zone.js:808
(anonymous) @ zone.js:724
Promise.then (async)
(anonymous) @ zone.js:1042
ZoneAwarePromise @ zone.js:891
Ctor.then @ zone.js:1041
Module.onRuntimeInitialized @ list:73
doRun @ a.out.js:1
run @ a.out.js:1
runCaller @ a.out.js:1
removeRunDependency @ a.out.js:1
receiveInstance @ a.out.js:1
receiveInstantiatedSource @ a.out.js:1
push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invoke @ zone.js:388
push../node_modules/zone.js/dist/zone.js.Zone.run @ zone.js:138
(anonymous) @ zone.js:872
push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invokeTask @ zone.js:421
push../node_modules/zone.js/dist/zone.js.Zone.runTask @ zone.js:188
drainMicroTaskQueue @ zone.js:595
Promise.then (async)
scheduleMicroTask @ zone.js:578
push../node_modules/zone.js/dist/zone.js.ZoneDelegate.scheduleTask @ zone.js:410
push../node_modules/zone.js/dist/zone.js.Zone.scheduleTask @ zone.js:232
push../node_modules/zone.js/dist/zone.js.Zone.scheduleMicroTask @ zone.js:252
scheduleResolveOrReject @ zone.js:862
resolvePromise @ zone.js:808
(anonymous) @ zone.js:724
Promise.then (async)
(anonymous) @ zone.js:1042
ZoneAwarePromise @ zone.js:891
Ctor.then @ zone.js:1041
createWasm @ a.out.js:1
Module.asm @ a.out.js:1
(anonymous) @ a.out.js:1

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