Add base support for ALC_EXT_disconnect

Individual backends need to be updated to handle disconnection events

Alc/ALc.c

@@ -169,7 +169,7 @@ static ALCchar *alcDefaultAllDeviceSpecifier = alcAllDeviceList;
 static ALCchar *alcCaptureDefaultDeviceSpecifier = alcCaptureDeviceList;
 
 
-static ALCchar alcExtensionList[] = "ALC_ENUMERATE_ALL_EXT ALC_ENUMERATION_EXT ALC_EXT_CAPTURE ALC_EXT_EFX";
+static ALCchar alcExtensionList[] = "ALC_ENUMERATE_ALL_EXT ALC_ENUMERATION_EXT ALC_EXT_CAPTURE ALC_EXT_disconnect ALC_EXT_EFX";
 static ALCint alcMajorVersion = 1;
 static ALCint alcMinorVersion = 1;
 
@@ -576,6 +576,7 @@ ALCAPI ALCdevice* ALCAPIENTRY alcCaptureOpenDevice(const ALCchar *deviceName, AL
         memset(pDevice, 0, sizeof(ALCdevice));
 
         //Validate device
+        pDevice->Connected = ALC_TRUE;
         pDevice->IsCaptureDevice = AL_TRUE;
 
         pDevice->Frequency = frequency;
@@ -808,6 +809,13 @@ ALCAPI ALCvoid ALCAPIENTRY alcGetIntegerv(ALCdevice *device,ALCenum param,ALsize
                 SetALCError(ALC_INVALID_VALUE);
             break;
 
+        case ALC_CONNECTED:
+            if(size <= 0)
+                SetALCError(ALC_INVALID_VALUE);
+            else
+                *data = device->Connected;
+            break;
+
         default:
             SetALCError(ALC_INVALID_ENUM);
             break;
@@ -944,6 +952,15 @@ ALCAPI ALCvoid ALCAPIENTRY alcGetIntegerv(ALCdevice *device,ALCenum param,ALsize
                         *data = device->lNumStereoSources;
                     break;
 
+                case ALC_CONNECTED:
+                    if(!IsDevice(device))
+                        SetALCError(ALC_INVALID_DEVICE);
+                    else if(size <= 0)
+                        SetALCError(ALC_INVALID_VALUE);
+                    else
+                        *data = device->Connected;
+                    break;
+
                 default:
                     SetALCError(ALC_INVALID_ENUM);
                     break;
@@ -1058,7 +1075,7 @@ ALCAPI ALCcontext* ALCAPIENTRY alcCreateContext(ALCdevice *device, const ALCint
     ALuint      ulAttributeIndex, ulRequestedStereoSources;
     ALuint      RequestedSends;
 
-    if(IsDevice(device) && !device->IsCaptureDevice)
+    if(IsDevice(device) && !device->IsCaptureDevice && device->Connected)
     {
         // Reset Context Last Error code
         g_eLastContextError = ALC_NO_ERROR;
@@ -1351,6 +1368,7 @@ ALCAPI ALCdevice* ALCAPIENTRY alcOpenDevice(const ALCchar *deviceName)
         memset(device, 0, sizeof(ALCdevice));
 
         //Validate device
+        device->Connected = ALC_TRUE;
         device->IsCaptureDevice = AL_FALSE;
 
         //Set output format

Alc/ALu.c

@@ -1385,3 +1385,39 @@ ALvoid aluMixData(ALCcontext *ALContext,ALvoid *buffer,ALsizei size,ALenum forma
 
     ProcessContext(ALContext);
 }
+
+ALvoid aluHandleDisconnect(ALCdevice *device)
+{
+    if(!device->IsCaptureDevice)
+    {
+        ALsource *source = NULL;
+
+        SuspendContext(device->Context);
+        if(device->Context)
+            source = device->Context->Source;
+
+        while(source)
+        {
+            if(source->state == AL_PLAYING)
+            {
+                ALbufferlistitem *BufferListItem;
+
+                source->state = AL_STOPPED;
+                source->inuse = AL_FALSE;
+                source->BuffersPlayed = source->BuffersInQueue;
+                BufferListItem = source->queue;
+                while(BufferListItem != NULL)
+                {
+                    BufferListItem->bufferstate = PROCESSED;
+                    BufferListItem = BufferListItem->next;
+                }
+                source->position = 0;
+                source->position_fraction = 0;
+            }
+            source = source->next;
+        }
+        ProcessContext(device->Context);
+    }
+
+    device->Connected = ALC_FALSE;
+}

OpenAL32/Include/alMain.h

@@ -171,6 +171,7 @@ void alc_pulse_init(BackendFuncs *func_list);
 
 struct ALCdevice_struct
 {
+    ALCboolean   Connected;
     ALboolean    IsCaptureDevice;
 
     ALuint       Frequency;

OpenAL32/Include/alu.h

@@ -147,6 +147,7 @@ static __inline ALuint aluChannelsFromFormat(ALenum format)
 
 ALvoid aluInitPanning(ALCcontext *Context);
 ALvoid aluMixData(ALCcontext *context,ALvoid *buffer,ALsizei size,ALenum format);
+ALvoid aluHandleDisconnect(ALCdevice *device);
 
 #ifdef __cplusplus
 }

OpenAL32/alSource.c

@@ -1347,6 +1347,22 @@ ALAPI ALvoid ALAPIENTRY alSourcePlayv(ALsizei n, const ALuint *pSourceList)
                     // Check if an Offset has been set
                     if(pSource->lOffset)
                         ApplyOffset(pSource, AL_FALSE);
+
+                    // If device is disconnected, go right to stopped
+                    if(!pContext->Device->Connected)
+                    {
+                        pSource->state = AL_STOPPED;
+                        pSource->inuse = AL_FALSE;
+                        pSource->BuffersPlayed = pSource->BuffersInQueue;
+                        ALBufferList = pSource->queue;
+                        while(ALBufferList != NULL)
+                        {
+                            ALBufferList->bufferstate = PROCESSED;
+                            ALBufferList = ALBufferList->next;
+                        }
+                        pSource->position = 0;
+                        pSource->position_fraction = 0;
+                    }
                 }
                 else
                 {