Allow to change i/o audio devices without restart

Still needs to restart the calls for now

Fixes #713

src/core.cpp

@@ -1873,3 +1873,53 @@ void Core::setNospam(uint32_t nospam)
     std::reverse(nspm, nspm + 4);
     tox_set_nospam(tox, nospam);
 }
+
+void Core::useAudioInput(const QString& inDevDescr)
+{
+    auto* tmp = alInDev;
+    alInDev = nullptr;
+    alcCaptureCloseDevice(tmp);
+    int stereoFlag = av_DefaultSettings.audio_channels==1 ? AL_FORMAT_MONO16 : AL_FORMAT_STEREO16;
+    if (inDevDescr.isEmpty())
+        alInDev = alcCaptureOpenDevice(nullptr,av_DefaultSettings.audio_sample_rate, stereoFlag,
+            (av_DefaultSettings.audio_frame_duration * av_DefaultSettings.audio_sample_rate * 4)
+                                       / 1000 * av_DefaultSettings.audio_channels);
+    else
+        alInDev = alcCaptureOpenDevice(inDevDescr.toStdString().c_str(),av_DefaultSettings.audio_sample_rate, stereoFlag,
+            (av_DefaultSettings.audio_frame_duration * av_DefaultSettings.audio_sample_rate * 4)
+                                       / 1000 * av_DefaultSettings.audio_channels);
+    if (!alInDev)
+        qWarning() << "Core: Cannot open input audio device";
+    else
+        qDebug() << "Core: Opening audio input "<<inDevDescr;
+}
+
+void Core::useAudioOutput(const QString& outDevDescr)
+{
+    auto* tmp = alOutDev;
+    alOutDev = nullptr;
+    alcCloseDevice(tmp);
+    if (outDevDescr.isEmpty())
+        alOutDev = alcOpenDevice(nullptr);
+    else
+        alOutDev = alcOpenDevice(outDevDescr.toStdString().c_str());
+    if (!alOutDev)
+    {
+        qWarning() << "Core: Cannot open output audio device";
+    }
+    else
+    {
+        alcDestroyContext(alContext);
+        alContext=alcCreateContext(alOutDev,nullptr);
+        if (!alcMakeContextCurrent(alContext))
+        {
+            qWarning() << "Core: Cannot create output audio context";
+            alcCloseDevice(alOutDev);
+        }
+        else
+            alGenSources(1, &alMainSource);
+
+
+        qDebug() << "Core: Opening audio output "<<outDevDescr;
+    }
+}

src/core.h

@@ -76,6 +76,9 @@ public:
     bool isPasswordSet(PasswordType passtype);
     bool isReady(); ///< Most of the API shouldn't be used until Core is ready, call start() first
 
+    void useAudioInput(const QString &name);
+    void useAudioOutput(const QString &name);
+
 public slots:
     void start(); ///< Initializes the core, must be called before anything else
     void process(); ///< Processes toxcore events and ensure we stay connected, called by its own timer

src/coreav.cpp

@@ -217,7 +217,7 @@ void Core::sendCallAudio(int callId, ToxAv* toxav)
     if (!calls[callId].active)
         return;
 
-    if (calls[callId].muteMic)
+    if (calls[callId].muteMic || !alInDev)
     {
         calls[callId].sendAudioTimer->start();
         return;
@@ -641,6 +641,7 @@ void Core::leaveGroupCall(int groupId)
     disconnect(groupCalls[groupId].sendAudioTimer,0,0,0);
     groupCalls[groupId].sendAudioTimer->stop();
     alcCaptureStop(alInDev);
+    groupCalls[groupId].alSources.clear();
 }
 
 void Core::sendGroupCallAudio(int groupId, ToxAv* toxav)
@@ -648,7 +649,7 @@ void Core::sendGroupCallAudio(int groupId, ToxAv* toxav)
     if (!groupCalls[groupId].active)
         return;
 
-    if (groupCalls[groupId].muteMic)
+    if (groupCalls[groupId].muteMic || !alInDev)
     {
         groupCalls[groupId].sendAudioTimer->start();
         return;

src/widget/form/settings/avform.cpp

@@ -17,6 +17,7 @@
 #include "avform.h"
 #include "ui_avsettings.h"
 #include "src/misc/settings.h"
+#include "src/core.h"
 
 #if defined(__APPLE__) && defined(__MACH__)
  #include <OpenAL/al.h>
@@ -179,9 +180,11 @@ void AVForm::getAudioOutDevices()
 void AVForm::onInDevChanged(const QString &deviceDescriptor)
 {
     Settings::getInstance().setInDev(deviceDescriptor);
+    Core::getInstance()->useAudioInput(deviceDescriptor);
 }
 
 void AVForm::onOutDevChanged(const QString& deviceDescriptor)
 {
     Settings::getInstance().setOutDev(deviceDescriptor);
+    Core::getInstance()->useAudioOutput(deviceDescriptor);
 }