avmodel: add helper function to get video device id from name

Change-Id: Ib74def3d68155fa8c3ea5728d148c06e7bb840f1

src/api/avmodel.h

@@ -110,6 +110,11 @@ public:
      * @return possibilities of the device
      */
     video::Capabilities getDeviceCapabilities(const std::string& deviceId) const;
+    /**
+     * Get the deviceId corresponding to a given device friendly name
+     * @return deviceId
+     */
+    std::string getDeviceIdFromName(const std::string& deviceName) const;
 
     /**
      * Get supported audio managers

src/avmodel.cpp

@@ -290,6 +290,22 @@ AVModel::setDeviceSettings(video::Settings& settings)
     }
 }
 
+std::string
+AVModel::getDeviceIdFromName(const std::string& deviceName) const
+{
+    auto devices = getDevices();
+    auto iter = std::find_if(devices.begin(), devices.end(),
+        [this, deviceName](const std::string& d) {
+            auto settings = getDeviceSettings(d);
+            return settings.name == deviceName;
+        });
+    if (iter == devices.end()) {
+        qWarning() << "Couldn't find device: " << deviceName.c_str();
+        return {};
+    }
+    return *iter;
+}
+
 std::vector<std::string>
 AVModel::getSupportedAudioManagers() const
 {