libqtappfw: Add radio binding support

Add initial support for the radio binding.  At the moment, everything
required for the current demo radio application is in place.  Further
development will be required to fill in support for changing bands
and the stereo mode.

Change-Id: I1b1866856ce8388b34624c14c692102c344a7a62
Signed-off-by: Scott Murray <scott.murray@konsulko.com>
(cherry picked from commit 8053629c99f157e716a4560ef8d1e194d569d960)

1 files changed, 245 insertions, 0 deletions

diff --git a/radio/radio.cpp b/radio/radio.cpp
new file mode 100644
index 0000000..2367b20
--- /dev/null
+++ b/radio/radio.cpp
@@ -0,0 +1,245 @@
+/*
+ * Copyright (C) 2018 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.
+ */
+
+#include "message.h"
+#include "messageengine.h"
+#include "radio.h"
+#include "radiomessage.h"
+#include "responsemessage.h"
+
+Radio::Radio (QUrl &url, QQmlContext *context, QObject * parent) :
+    QObject(parent),
+    m_mloop(nullptr),
+    m_band(1),
+    m_frequency(0),
+    m_playing(false),
+    m_scanning(false)
+{
+    m_mloop = new MessageEngine(url);
+    m_context = context;
+
+    QObject::connect(m_mloop, &MessageEngine::connected, this, &Radio::onConnected);
+    QObject::connect(m_mloop, &MessageEngine::disconnected, this, &Radio::onDisconnected);
+    QObject::connect(m_mloop, &MessageEngine::messageReceived, this, &Radio::onMessageReceived);
+}
+
+Radio::~Radio()
+{
+    delete m_mloop;
+}
+
+void Radio::setBand(int band)
+{
+    RadioMessage *rmsg = new RadioMessage();
+    QJsonObject parameter;
+
+    parameter.insert("band", band ? "FM": "AM");
+    rmsg->createRequest("band", parameter);
+    m_mloop->sendMessage(rmsg);
+    delete rmsg;
+}
+
+void Radio::setFrequency(int frequency)
+{
+    RadioMessage *rmsg = new RadioMessage();
+    QJsonObject parameter;
+
+    if (m_scanning)
+        scanStop();
+
+    if (frequency == m_frequency)
+        return;
+
+    parameter.insert("value", QString::number(frequency));
+    rmsg->createRequest("frequency", parameter);
+    m_mloop->sendMessage(rmsg);
+    delete rmsg;
+
+    // To improve UI responsiveness, signal the change here immediately
+    // This fixes visual glitchiness in the slider caused by the frequency
+    // update event taking long enough that the QML engine gets a chance
+    // to update the slider with the current value before the event with
+    // the new value comes.
+    m_frequency = frequency;
+    emit frequencyChanged(m_frequency);
+}
+
+// control related methods
+
+void Radio::start()
+{
+    RadioMessage *rmsg = new RadioMessage();
+    QJsonObject parameter;
+
+    rmsg->createRequest("start", parameter);
+    m_mloop->sendMessage(rmsg);
+    delete rmsg;
+}
+
+void Radio::stop()
+{
+    RadioMessage *rmsg = new RadioMessage();
+
+    QJsonObject parameter;
+    rmsg->createRequest("stop", parameter);
+    m_mloop->sendMessage(rmsg);
+    delete rmsg;
+}
+
+void Radio::scanForward()
+{
+    if (m_scanning)
+        return;
+
+    RadioMessage *rmsg = new RadioMessage();
+    QJsonObject parameter;
+    parameter.insert("direction", "forward");
+    rmsg->createRequest("scan_start", parameter);
+    m_mloop->sendMessage(rmsg);
+
+    m_scanning = true;
+    emit scanningChanged(m_scanning);
+
+    delete rmsg;
+}
+
+void Radio::scanBackward()
+{
+    if (m_scanning)
+        return;
+
+    RadioMessage *rmsg = new RadioMessage();
+    QJsonObject parameter;
+    parameter.insert("direction", "backward");
+    rmsg->createRequest("scan_start", parameter);
+    m_mloop->sendMessage(rmsg);
+
+    m_scanning = true;
+    emit scanningChanged(m_scanning);
+
+    delete rmsg;
+}
+
+void Radio::scanStop()
+{
+    RadioMessage *rmsg = new RadioMessage();
+
+    QJsonObject parameter;
+    rmsg->createRequest("scan_stop", parameter);
+    m_mloop->sendMessage(rmsg);
+
+    m_scanning = false;
+    emit scanningChanged(m_scanning);
+
+    delete rmsg;
+}
+
+void Radio::updateFrequencyBandParameters()
+{
+    RadioMessage *rmsg = new RadioMessage();
+
+    QJsonObject parameter;
+    parameter.insert("band", m_band ? "FM" : "AM");
+    rmsg->createRequest("frequency_range", parameter);
+    m_mloop->sendMessage(rmsg);
+    delete rmsg;
+
+    rmsg = new RadioMessage();
+    rmsg->createRequest("frequency_step", parameter);
+    m_mloop->sendMessage(rmsg);
+    delete rmsg;
+}
+
+void Radio::onConnected()
+{
+    QStringListIterator eventIterator(events);
+    RadioMessage *rmsg;
+
+    while (eventIterator.hasNext()) {
+        rmsg = new RadioMessage();
+        QJsonObject parameter;
+        parameter.insert("value", eventIterator.next());
+        rmsg->createRequest("subscribe", parameter);
+        m_mloop->sendMessage(rmsg);
+        delete rmsg;
+    }
+
+    // Trigger initial update of frequency band parameters (min/max/step)
+    updateFrequencyBandParameters();
+}
+
+void Radio::onDisconnected()
+{
+    QStringListIterator eventIterator(events);
+    RadioMessage *rmsg;
+
+    while (eventIterator.hasNext()) {
+        rmsg = new RadioMessage();
+        QJsonObject parameter;
+        parameter.insert("value", eventIterator.next());
+        rmsg->createRequest("unsubscribe", parameter);
+        m_mloop->sendMessage(rmsg);
+        delete rmsg;
+    }
+}
+
+void Radio::onMessageReceived(MessageType type, Message *msg)
+{
+    if (msg->isEvent() && type == RadioEventMessage) {
+        RadioMessage *rmsg = qobject_cast<RadioMessage*>(msg);
+
+        if (rmsg->isFrequencyEvent()) {
+            unsigned int frequency = rmsg->eventData().value("value").toInt();
+            m_frequency = frequency;
+            if (!m_scanning && (m_frequency != frequency)) {
+                emit frequencyChanged(m_frequency);
+            }
+        } else if (rmsg->isStationFoundEvent()) {
+            m_scanning = false;
+            emit scanningChanged(m_scanning);
+
+            m_frequency = rmsg->eventData().value("value").toInt();
+            emit frequencyChanged(m_frequency);
+        } else if (rmsg->isStatusEvent()) {
+            if (rmsg->eventData().value("value") == QString("playing")) {
+                m_playing = true;
+                emit playingChanged(m_playing);
+            } else if (rmsg->eventData().value("value") == QString("stopped")) {
+                m_playing = false;
+                emit playingChanged(m_playing);
+            }
+        }
+    } else if (msg->isReply() && type == ResponseRequestMessage) {
+        ResponseMessage *rmsg = qobject_cast<ResponseMessage*>(msg);
+
+        if (rmsg->requestVerb() == "frequency_range") {
+            m_minFrequency = rmsg->replyData().value("min").toInt();
+            emit minFrequencyChanged(m_minFrequency);
+            m_maxFrequency = rmsg->replyData().value("max").toInt();
+            emit maxFrequencyChanged(m_maxFrequency);
+
+            // Handle start up
+            if (!m_frequency) {
+                m_frequency = m_minFrequency;
+                emit frequencyChanged(m_frequency);
+            }
+        } else if (rmsg->requestVerb() == "frequency_step") {
+            m_frequencyStep = rmsg->replyData().value("step").toInt();
+            emit frequencyStepChanged(m_frequencyStep);
+        }
+    }
+    msg->deleteLater();
+}