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/*
* Copyright (C) 2016 The Qt Company Ltd.
* Copyright (C) 2017 Konsulko Group
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import QtQuick 2.6
import QtWebSockets 1.0
WebSocket {
id: root
active: true
url: bindingAddress
property string apiString: "radio"
property var verbs: []
property string payloadLength: "9999"
readonly property var msgid: {
"call": 2,
"retok": 3,
"reterr": 4,
"event": 5
}
readonly property int amBand: 0
readonly property int fmBand: 1
readonly property int stoppedState: 0
readonly property int activeState: 1
property int band: fmBand
property int frequency
property int frequencyStep
property int minimumFrequency
property int maximumFrequency
property int state: stoppedState
property int scanningState: stoppedState
property bool scanningFreqUpdate: false
property string stationId: ""
signal stationFound
property Connections c : Connections {
target: root
onFrequencyChanged: {
if(scanningState != activeState) {
// Not scanning, push update
sendSocketMessage("frequency", { value: frequency })
} else if(!scanningFreqUpdate) {
// External change, stop scanning
sendSocketMessage("scan_stop", 'None')
scanningState = stoppedState
sendSocketMessage("frequency", { value: frequency })
} else {
// This update was from scanning, clear state
scanningFreqUpdate = false
}
}
onBandChanged: {
sendSocketMessage("band", { value: band })
updateFrequencyRange(band)
updateFrequencyStep(band)
frequency = minimumFrequency
}
}
onTextMessageReceived: {
var json = JSON.parse(message)
//console.debug("Raw response: " + message)
var request = json[2].request
var response = json[2].response
switch (json[0]) {
case msgid.call:
break
case msgid.retok:
var verb = verbs.shift()
if (verb == "frequency_range") {
minimumFrequency = response.min
maximumFrequency = response.max
} else if (verb == "frequency_step") {
frequencyStep = response.step
}
break
case msgid.event:
var event = JSON.parse(JSON.stringify(json[2]))
if (event.event === "radio/frequency") {
if(scanningState == activeState) {
scanningFreqUpdate = true
frequency = event.data.value
}
} else if (event.event === "radio/station_found") {
if(scanningState == activeState) {
scanningState = stoppedState
stationId = freq2str(event.data.value)
root.stationFound()
}
}
break
case msg.reterr:
console.debug("Bad return value, binding probably not installed")
break
case MessageId.event:
break
}
}
onStatusChanged: {
switch (status) {
case WebSocket.Open:
// Initialize band values now that we're connected to the
// binding
updateFrequencyRange(band)
updateFrequencyStep(band)
frequency = minimumFrequency
sendSocketMessage("subscribe", { value: "frequency" })
sendSocketMessage("subscribe", { value: "station_found" })
break
case WebSocket.Error:
console.debug("WebSocket error: " + root.errorString)
break
}
}
function freq2str(freq) {
if (freq > 5000000) {
return '%1 MHz'.arg((freq / 1000000).toFixed(1))
} else {
return '%1 kHz'.arg((freq / 1000).toFixed(0))
}
}
function sendSocketMessage(verb, parameter) {
var requestJson = [ msgid.call, payloadLength, apiString + '/'
+ verb, parameter ]
//console.debug("sendSocketMessage: " + JSON.stringify(requestJson))
verbs.push(verb)
sendTextMessage(JSON.stringify(requestJson))
}
function start() {
sendSocketMessage("start", 'None')
state = activeState
}
function stop() {
sendSocketMessage("stop", 'None')
state = stoppedState
}
function tuneUp() {
frequency += frequencyStep
if(frequency > maximumFrequency) {
frequency = minimumFrequency
}
}
function tuneDown() {
frequency -= frequencyStep
if(frequency < minimumFrequency) {
frequency = maximumFrequency
}
}
function scanUp() {
scanningState = activeState
sendSocketMessage("scan_start", { direction: "forward" })
}
function scanDown() {
scanningState = activeState
sendSocketMessage("scan_start", { direction: "backward" })
}
function updateFrequencyRange(band) {
sendSocketMessage("frequency_range", { band: band })
}
function updateFrequencyStep(band) {
sendSocketMessage("frequency_step", { band: band })
}
}
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