move sunshine to src

- this will allow for common cpp workflow files within org

src/platform/macos/av_video.m

@@ -0,0 +1,184 @@
+#import "av_video.h"
+
+@implementation AVVideo
+
+// XXX: Currently, this function only returns the screen IDs as names,
+// which is not very helpful to the user. The API to retrieve names
+// was deprecated with 10.9+.
+// However, there is a solution with little external code that can be used:
+// https://stackoverflow.com/questions/20025868/cgdisplayioserviceport-is-deprecated-in-os-x-10-9-how-to-replace
++ (NSArray<NSDictionary *> *)displayNames {
+  CGDirectDisplayID displays[kMaxDisplays];
+  uint32_t count;
+  if(CGGetActiveDisplayList(kMaxDisplays, displays, &count) != kCGErrorSuccess) {
+    return [NSArray array];
+  }
+
+  NSMutableArray *result = [NSMutableArray array];
+
+  for(uint32_t i = 0; i < count; i++) {
+    [result addObject:@{
+      @"id": [NSNumber numberWithUnsignedInt:displays[i]],
+      @"name": [NSString stringWithFormat:@"%d", displays[i]]
+    }];
+  }
+
+  return [NSArray arrayWithArray:result];
+}
+
+- (id)initWithDisplay:(CGDirectDisplayID)displayID frameRate:(int)frameRate {
+  self = [super init];
+
+  CGDisplayModeRef mode = CGDisplayCopyDisplayMode(displayID);
+
+  self.displayID        = displayID;
+  self.pixelFormat      = kCVPixelFormatType_32BGRA;
+  self.frameWidth       = CGDisplayModeGetPixelWidth(mode);
+  self.frameHeight      = CGDisplayModeGetPixelHeight(mode);
+  self.scaling          = CGDisplayPixelsWide(displayID) / CGDisplayModeGetPixelWidth(mode);
+  self.paddingLeft      = 0;
+  self.paddingRight     = 0;
+  self.paddingTop       = 0;
+  self.paddingBottom    = 0;
+  self.minFrameDuration = CMTimeMake(1, frameRate);
+  self.session          = [[AVCaptureSession alloc] init];
+  self.videoOutputs     = [[NSMapTable alloc] init];
+  self.captureCallbacks = [[NSMapTable alloc] init];
+  self.captureSignals   = [[NSMapTable alloc] init];
+
+  CFRelease(mode);
+
+  AVCaptureScreenInput *screenInput = [[AVCaptureScreenInput alloc] initWithDisplayID:self.displayID];
+  [screenInput setMinFrameDuration:self.minFrameDuration];
+
+  if([self.session canAddInput:screenInput]) {
+    [self.session addInput:screenInput];
+  }
+  else {
+    [screenInput release];
+    return nil;
+  }
+
+  [self.session startRunning];
+
+  return self;
+}
+
+- (void)dealloc {
+  [self.videoOutputs release];
+  [self.captureCallbacks release];
+  [self.captureSignals release];
+  [self.session stopRunning];
+  [super dealloc];
+}
+
+- (void)setFrameWidth:(int)frameWidth frameHeight:(int)frameHeight {
+  CGImageRef screenshot = CGDisplayCreateImage(self.displayID);
+
+  self.frameWidth  = frameWidth;
+  self.frameHeight = frameHeight;
+
+  double screenRatio = (double)CGImageGetWidth(screenshot) / (double)CGImageGetHeight(screenshot);
+  double streamRatio = (double)frameWidth / (double)frameHeight;
+
+  if(screenRatio < streamRatio) {
+    int padding        = frameWidth - (frameHeight * screenRatio);
+    self.paddingLeft   = padding / 2;
+    self.paddingRight  = padding - self.paddingLeft;
+    self.paddingTop    = 0;
+    self.paddingBottom = 0;
+  }
+  else {
+    int padding        = frameHeight - (frameWidth / screenRatio);
+    self.paddingLeft   = 0;
+    self.paddingRight  = 0;
+    self.paddingTop    = padding / 2;
+    self.paddingBottom = padding - self.paddingTop;
+  }
+
+  // XXX: if the streamed image is larger than the native resolution, we add a black box around
+  // the frame. Instead the frame should be resized entirely.
+  int delta_width = frameWidth - (CGImageGetWidth(screenshot) + self.paddingLeft + self.paddingRight);
+  if(delta_width > 0) {
+    int adjust_left  = delta_width / 2;
+    int adjust_right = delta_width - adjust_left;
+    self.paddingLeft += adjust_left;
+    self.paddingRight += adjust_right;
+  }
+
+  int delta_height = frameHeight - (CGImageGetHeight(screenshot) + self.paddingTop + self.paddingBottom);
+  if(delta_height > 0) {
+    int adjust_top    = delta_height / 2;
+    int adjust_bottom = delta_height - adjust_top;
+    self.paddingTop += adjust_top;
+    self.paddingBottom += adjust_bottom;
+  }
+
+  CFRelease(screenshot);
+}
+
+- (dispatch_semaphore_t)capture:(FrameCallbackBlock)frameCallback {
+  @synchronized(self) {
+    AVCaptureVideoDataOutput *videoOutput = [[AVCaptureVideoDataOutput alloc] init];
+
+    [videoOutput setVideoSettings:@{
+      (NSString *)kCVPixelBufferPixelFormatTypeKey: [NSNumber numberWithUnsignedInt:self.pixelFormat],
+      (NSString *)kCVPixelBufferWidthKey: [NSNumber numberWithInt:self.frameWidth],
+      (NSString *)kCVPixelBufferExtendedPixelsRightKey: [NSNumber numberWithInt:self.paddingRight],
+      (NSString *)kCVPixelBufferExtendedPixelsLeftKey: [NSNumber numberWithInt:self.paddingLeft],
+      (NSString *)kCVPixelBufferExtendedPixelsTopKey: [NSNumber numberWithInt:self.paddingTop],
+      (NSString *)kCVPixelBufferExtendedPixelsBottomKey: [NSNumber numberWithInt:self.paddingBottom],
+      (NSString *)kCVPixelBufferHeightKey: [NSNumber numberWithInt:self.frameHeight]
+    }];
+
+    dispatch_queue_attr_t qos       = dispatch_queue_attr_make_with_qos_class(DISPATCH_QUEUE_SERIAL,
+            QOS_CLASS_USER_INITIATED,
+            DISPATCH_QUEUE_PRIORITY_HIGH);
+    dispatch_queue_t recordingQueue = dispatch_queue_create("videoCaptureQueue", qos);
+    [videoOutput setSampleBufferDelegate:self queue:recordingQueue];
+
+    [self.session stopRunning];
+
+    if([self.session canAddOutput:videoOutput]) {
+      [self.session addOutput:videoOutput];
+    }
+    else {
+      [videoOutput release];
+      return nil;
+    }
+
+    AVCaptureConnection *videoConnection = [videoOutput connectionWithMediaType:AVMediaTypeVideo];
+    dispatch_semaphore_t signal          = dispatch_semaphore_create(0);
+
+    [self.videoOutputs setObject:videoOutput forKey:videoConnection];
+    [self.captureCallbacks setObject:frameCallback forKey:videoConnection];
+    [self.captureSignals setObject:signal forKey:videoConnection];
+
+    [self.session startRunning];
+
+    return signal;
+  }
+}
+
+- (void)captureOutput:(AVCaptureOutput *)captureOutput
+  didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer
+         fromConnection:(AVCaptureConnection *)connection {
+
+  FrameCallbackBlock callback = [self.captureCallbacks objectForKey:connection];
+
+  if(callback != nil) {
+    if(!callback(sampleBuffer)) {
+      @synchronized(self) {
+        [self.session stopRunning];
+        [self.captureCallbacks removeObjectForKey:connection];
+        [self.session removeOutput:[self.videoOutputs objectForKey:connection]];
+        [self.videoOutputs removeObjectForKey:connection];
+        dispatch_semaphore_signal([self.captureSignals objectForKey:connection]);
+        [self.captureSignals removeObjectForKey:connection];
+        [self.session startRunning];
+      }
+    }
+  }
+}
+
+@end