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Optimize default camera selection #40

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Optimize default camera selection #40

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d8047f8
Optimize default camera selection
Sep 1, 2022
c82230c
fix: add async
Sep 1, 2022
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17 changes: 15 additions & 2 deletions src/components/StreamBarcodeReader.vue
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Original file line number Diff line number Diff line change
Expand Up @@ -43,9 +43,22 @@ export default {
},

methods: {
start() {
async start() {
// Modern phones often have multipe front/rear cameras.
// Sometimes special purpose cameras like the wide-angle camera are picked
// by default. Those are not optimal for scanning QR codes but standard
// media constraints don't allow us to specify which camera we want exactly.
// However, explicitly picking the first entry in the list of all videoinput
// devices for as the default front camera and the last entry as the default
// rear camera seems to be a workaround.
let selected_device_id = undefined
const devices = await this.codeReader.listVideoInputDevices()
if (devices.length > 2) {
const selectedCamera = devices[devices.length - 1]
selected_device_id = selectedCamera.deviceId
}
this.codeReader.decodeFromVideoDevice(
undefined,
selected_device_id,
this.$refs.scanner,
(result, err) => {
if (result) {
Expand Down