Add push to talk support to homescreen

Reworked version of Alexa specific changes from ICS to add push to
talk button for voice services to homescreen media area.

v2: change config.xml to audiomixer

v3: reworked to not be Alexa specific:
- Now use the default voiceagent if available, instead of hard-coding
  Alexa usage
- The Alexa logo for the button has been replaced with a generic
  microphone icon derived from the radio application's launcher icon.
  This is a placeholder until a new icon is provided by LF graphics
  team. Meeting any Amazon requirements around Alexa chrome is now
  envisioned as being provided for with a TBD voiceagent API
  enhancement.
- The QML for the PTT button has been moved to MediaAreaBlank.qml,
  which seems a more logical location for it ATM.  It is likely that
  the MediaArea QML should be simplified in a future change, as it
  currently contains a signficant amount of unused code.
- The PTT button has been moved to the left hand side of the media
  area, as this seems more sensible if demonstrating driver usage.
- The delay on fade-out of the master volume slider has been lowered
  to 3 seconds from 5, with the PTT button present it started seeming
  excessive during testing.
- Some extra debug messages have been added to make tracking the
  voiceagent state more straightforward.

Bug-AGL: SPEC-2764,

Signed-off-by: Naveen Bobbili <nbobbili@amazon.com>
Signed-off-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>
Signed-off-by: Scott Murray <scott.murray@konsulko.com>
Change-Id: I398bf7aebc5c9b459b1fce94511eee3698c08347

1 files changed, 42 insertions, 0 deletions

diff --git a/homescreen/src/chromecontroller.h b/homescreen/src/chromecontroller.h
new file mode 100644
index 0000000..2a76002
--- /dev/null
+++ b/homescreen/src/chromecontroller.h
@@ -0,0 +1,42 @@
+#pragma once
+
+#include <QObject>
+#include <QUrl>
+
+class AglSocketWrapper;
+class ChromeController : public QObject
+{
+    Q_OBJECT
+
+    Q_PROPERTY(bool agentPresent READ agentPresent NOTIFY agentPresentChanged)
+    Q_PROPERTY(int chromeState READ chromeState NOTIFY chromeStateChanged)
+
+public:
+    enum ChromeState {
+        Idle = 0,
+        Listening,
+        Thinking,
+        Speaking,
+        MicrophoneOff
+    };
+    Q_ENUM(ChromeState)
+
+    explicit ChromeController(const QUrl &bindingUrl, QObject *parent = nullptr);
+    bool agentPresent() const { return m_agentPresent; }
+    int chromeState() const { return m_chromeState; }
+
+public slots:
+    void pushToTalk();
+
+signals:
+    void agentPresentChanged();
+    void chromeStateChanged();
+
+private:
+    void setChromeState(ChromeState state);
+
+    AglSocketWrapper *m_aglSocket;
+    QString m_voiceAgentId;
+    bool m_agentPresent = false;
+    ChromeState m_chromeState = Idle;
+};