VuoSyphonListener.m

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#import "VuoSyphon.h"
#import "VuoSyphonListener.h"
#include "VuoImageRenderer.h"
#include <OpenGL/OpenGL.h>
#include <OpenGL/CGLMacro.h>
#include "VuoGlContext.h"
 
#ifdef VUO_COMPILER
VuoModuleMetadata({
                     "title" : "VuoSyphonListener",
                     "dependencies" : [
                         "VuoSyphonServerNotifier",
                         "AppKit.framework",
                         "VuoGlContext"
                     ]
                 });
#endif
 
#include <pthread.h>
static pthread_t VuoSyphonListener_mainThread = NULL;   
 
static void __attribute__((constructor)) VuoSyphonListener_init()
{
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
                       VUOLOG_PROFILE_BEGIN(mainQueue);
                       dispatch_sync(dispatch_get_main_queue(), ^{
                                         VUOLOG_PROFILE_END(mainQueue);
                                         VuoSyphonListener_mainThread = pthread_self();
                                     });
                   });
}
 
static bool VuoSyphonListener_isMainThread(void)
{
    return VuoSyphonListener_mainThread == pthread_self();
}
 
 
void VuoSyphonListener_freeSyphonImageCallback(VuoImage image)
{
    SyphonImage *frame = (SyphonImage *)image->freeCallbackContext;
    [frame release];
}
 
@implementation VuoSyphonListener
 
@synthesize syphonClient;
 
-(id) init
{
    if (self = [super init])
    {
        // Wait for VuoSyphonListener_init() to complete.
        VUOLOG_PROFILE_BEGIN(mainQueue);
        dispatch_sync(dispatch_get_main_queue(), ^{
            VUOLOG_PROFILE_END(mainQueue);
        });
 
        callback = NULL;
        serverNotifier = NULL;
        desiredServer = VuoSyphonServerDescription_make(VuoText_make("*"), VuoText_make("*"), VuoText_make("*"), true);
        VuoSyphonServerDescription_retain(desiredServer);
        refreshQueue = dispatch_queue_create("vuo.syphon.VuoSyphonListener", 0);
    }
    return self;
}
 
-(void) startListeningWithServerDescription:(VuoSyphonServerDescription)description callback:(void(*)(VuoImage))receivedFrame
{
    dispatch_sync(refreshQueue, ^{
 
                      VuoSyphonServerDescription_retain(description);
                      VuoSyphonServerDescription_release(desiredServer);
                      desiredServer = description;
 
                      callback = receivedFrame;
 
                      VuoList_VuoSyphonServerDescription allServerDescriptions = VuoSyphon_getAvailableServerDescriptions();
                      VuoRetain(allServerDescriptions);
                      [self refreshSyphonClientThreadUnsafe:allServerDescriptions];
                      VuoRelease(allServerDescriptions);
 
                      if (!serverNotifier)
                      {
                          serverNotifier = VuoSyphonServerNotifier_make();
                          VuoRetain(serverNotifier);
                          VuoSyphonServerNotifier_setNotificationMethod(serverNotifier, self, @selector(refreshSyphonClient:));
                          VuoSyphonServerNotifier_start(serverNotifier);
                      }
                  });
}
 
-(void) refreshSyphonClientThreadUnsafe:(VuoList_VuoSyphonServerDescription)serverDescriptions
{
    if (syphonClient)
    {
        // Already connected to a server — make sure it's still desired and available.
 
        __block NSDictionary *currentDict;
        if (VuoSyphonListener_isMainThread())
            currentDict = [[syphonClient serverDescription] retain];
        else
        {
            VUOLOG_PROFILE_BEGIN(mainQueue);
            dispatch_sync(dispatch_get_main_queue(), ^{
                              VUOLOG_PROFILE_END(mainQueue);
                              currentDict = [[syphonClient serverDescription] retain];
                          });
        }
 
        bool isCurrentStillDesired;
        {
            VuoText currentName = VuoText_make([[currentDict objectForKey:SyphonServerDescriptionUUIDKey] UTF8String]);
            VuoText currentAppName = VuoText_make([[currentDict objectForKey:SyphonServerDescriptionUUIDKey] UTF8String]);
            VuoSyphonServerDescription current = VuoSyphonServerDescription_make(VuoText_make("*"), currentName, currentAppName, true);
            VuoList_VuoSyphonServerDescription currentAsList = VuoListCreate_VuoSyphonServerDescription();
            VuoListAppendValue_VuoSyphonServerDescription(currentAsList, current);
            VuoList_VuoSyphonServerDescription currentMatchingDesired = VuoSyphon_filterServerDescriptions(currentAsList, desiredServer);
            isCurrentStillDesired = (VuoListGetCount_VuoSyphonServerDescription(currentMatchingDesired) > 0);
        }
 
        bool isCurrentStillAvailable;
        {
            VuoText currentUUID = VuoText_make([[currentDict objectForKey:SyphonServerDescriptionUUIDKey] UTF8String]);
            VuoSyphonServerDescription current = VuoSyphonServerDescription_make(currentUUID, VuoText_make("*"), VuoText_make("*"), true);
            VuoList_VuoSyphonServerDescription availableMatchingCurrent = VuoSyphon_filterServerDescriptions(serverDescriptions, current);
            isCurrentStillAvailable = (VuoListGetCount_VuoSyphonServerDescription(availableMatchingCurrent) > 0);
        }
        [currentDict release];
 
        if (isCurrentStillDesired && isCurrentStillAvailable)
        {
            return;
        }
        else
        {
            if (VuoSyphonListener_isMainThread())
                [syphonClient stop];
            else
            {
                VUOLOG_PROFILE_BEGIN(mainQueue);
                dispatch_sync(dispatch_get_main_queue(), ^{
                                  VUOLOG_PROFILE_END(mainQueue);
                                  [syphonClient stop];
                              });
            }
            self.syphonClient = nil;
        }
    }
 
    // Not connected to a server — see if a desired one is available.
 
    VuoList_VuoSyphonServerDescription matchingServers = VuoSyphon_filterServerDescriptions(serverDescriptions, desiredServer);
    VuoRetain(matchingServers);
 
    if (VuoListGetCount_VuoSyphonServerDescription(matchingServers) == 0)
    {
        // No desired server is available.
        if (VuoSyphonListener_isMainThread())
            [syphonClient stop];
        else
        {
            VUOLOG_PROFILE_BEGIN(mainQueue);
            dispatch_sync(dispatch_get_main_queue(), ^{
                              VUOLOG_PROFILE_END(mainQueue);
                              [syphonClient stop];
                          });
        }
        self.syphonClient = nil;
        VuoRelease(matchingServers);
        return;
    }
 
    VuoSyphonServerDescription chosenServer = VuoListGetValue_VuoSyphonServerDescription(matchingServers, 1);
    VuoRelease(matchingServers);
 
    // Look up the official server description. (SyphonClient won't accept one constructed from chosenServer's fields.)
    NSDictionary *chosenServerDict = nil;
    NSString *chosenUUID = [NSString stringWithUTF8String:chosenServer.serverUUID];
    NSArray *allServerDicts = [[SyphonServerDirectory sharedDirectory] servers];
    for (NSDictionary *serverDict in allServerDicts)
    {
        if ([chosenUUID isEqualToString:[serverDict objectForKey:SyphonServerDescriptionUUIDKey]])
        {
            chosenServerDict = serverDict;
            break;
        }
    }
 
    // Connect the client to the server.
    void (^connect)(void) = ^{
        __block SyphonClient *s;
        VuoGlContext_perform(^(CGLContextObj cgl_ctx){
            s = [[SyphonClient alloc] initWithServerDescription:chosenServerDict context:cgl_ctx options:nil newFrameHandler:^(SyphonClient *client) {
                                      SyphonImage *frame = [client newFrameImage];
 
                                      if (frame.textureSize.width < 1 || frame.textureSize.height < 1)
                                      {
                                          [frame release];
                                          return;
                                      }
 
                                      VuoImage image = VuoImage_makeClientOwnedGlTextureRectangle(frame.textureName, GL_RGBA, frame.textureSize.width, frame.textureSize.height, VuoSyphonListener_freeSyphonImageCallback, frame);
                                      VuoRetain(image);
                                      callback(VuoImage_makeCopy(image, false, 0, 0, false));
                                      VuoRelease(image);
 
                                      }];
        });
        self.syphonClient = s;
        [s release];
    };
    if (VuoSyphonListener_isMainThread())
        connect();
    else
    {
        VUOLOG_PROFILE_BEGIN(mainQueue);
        dispatch_sync(dispatch_get_main_queue(), ^{
            VUOLOG_PROFILE_END(mainQueue);
            connect();
        });
    }
}
 
-(void) refreshSyphonClient:(VuoList_VuoSyphonServerDescription)serverDescriptions
{
    dispatch_async(refreshQueue, ^{
                      [self refreshSyphonClientThreadUnsafe:serverDescriptions];
                  });
}
 
-(void) stopListening
{
    dispatch_sync(refreshQueue, ^{
 
                      VuoSyphonServerNotifier_stop(serverNotifier);
                      VuoRelease(serverNotifier);
                      serverNotifier = NULL;
 
                      VUOLOG_PROFILE_BEGIN(mainQueue);
                      dispatch_sync(dispatch_get_main_queue(), ^{
                          VUOLOG_PROFILE_END(mainQueue);
                          [syphonClient stop];
                      });
                      self.syphonClient = nil;
                  });
}
 
-(void) dealloc
{
    VuoSyphonServerDescription_release(desiredServer);
    dispatch_release(refreshQueue);
    [super dealloc];
}
 
@end