Add system.getCapabilitiesString and system.capabilitiesChanged

This is for the web-client to send X-Plex-Client-Capabilites to
the server. This fixes the wrong track being selected by default.

We send headers indicating that we want multichannel unless stereo
channels are selected explicity.

See issue #115 for discussion

src/system/SystemComponent.cpp

@@ -12,6 +12,7 @@
 #include "QsLog.h"
 #include "settings/SettingsComponent.h"
 #include "ui/KonvergoWindow.h"
+#include "settings/SettingsSection.h"
 #include "Paths.h"
 #include "Names.h"
 
@@ -66,6 +67,11 @@ SystemComponent::SystemComponent(QObject* parent) : ComponentBase(parent), m_pla
 #elif defined(Q_PROCESSOR_X86_64)
   m_platformArch = platformArchX86_64;
 #endif
+
+  connect(SettingsComponent::Get().getSection(SETTINGS_SECTION_AUDIO), &SettingsSection::valuesUpdated, [=]()
+  {
+    emit capabilitiesChanged(getCapabilitiesString());
+  });
 }
 
 /////////////////////////////////////////////////////////////////////////////////////////
@@ -321,5 +327,30 @@ void SystemComponent::hello(const QString& version)
   m_webClientVersion = version;
 }
 
+/////////////////////////////////////////////////////////////////////////////////////////
+#define BASESTR "protocols=shoutcast,http-video;videoDecoders=h264{profile:high&resolution:2160&level:52};audioDecoders=mp3,aac,dts{bitrate:800000&channels:%1},ac3{bitrate:800000&channels:%2}"
+
+/////////////////////////////////////////////////////////////////////////////////////////
+QString SystemComponent::getCapabilitiesString()
+{
+  auto capstring = QString(BASESTR);
+  auto channels = SettingsComponent::Get().value(SETTINGS_SECTION_AUDIO, "channels").toString();
+  auto dtsenabled = SettingsComponent::Get().value(SETTINGS_SECTION_AUDIO, "passthrough.dts").toBool();
+  auto ac3enabled = SettingsComponent::Get().value(SETTINGS_SECTION_AUDIO, "passthrough.ac3").toBool();
+
+  // Assume that auto means that we want to select multi-channel tracks by default.
+  // So really only disable it when 2.0 is selected.
+  //
+  int ac3channels = 2;
+  int dtschannels = 2;
 
+  if (channels != "2.0")
+    dtschannels = ac3channels = 8;
+  else if (dtsenabled)
+    dtschannels = 8;
+  else if (ac3enabled)
+    ac3channels = 8;
+
+  return capstring.arg(dtschannels).arg(ac3channels);
+}
 

src/system/SystemComponent.h

@@ -45,6 +45,9 @@ public:
   // called by the web-client when everything is properly inited
   Q_INVOKABLE void hello(const QString& version);
 
+  Q_INVOKABLE QString getCapabilitiesString();
+  Q_SIGNAL void capabilitiesChanged(const QString& capabilities);
+
   // possible os types type enum
   enum PlatformType
   {
@@ -92,6 +95,7 @@ private:
   bool m_doLogMessages;
   QString m_authenticationToken;
   QString m_webClientVersion;
+
 };
 
 #endif