feat(macos/capture): support for capture display other than main display (#2449)

src/platform/macos/av_video.m

@@ -23,13 +23,24 @@
   for (uint32_t i = 0; i < count; i++) {
     [result addObject:@{
       @"id": [NSNumber numberWithUnsignedInt:displays[i]],
-      @"name": [NSString stringWithFormat:@"%d", displays[i]]
+      @"name": [NSString stringWithFormat:@"%d", displays[i]],
+      @"displayName": [self getDisplayName:displays[i]],
     }];
   }
 
   return [NSArray arrayWithArray:result];
 }
 
++ (NSString *)getDisplayName:(CGDirectDisplayID)displayID {
+  NSScreen *screens = [NSScreen screens];
+  for (NSScreen *screen in screens) {
+    if (screen.deviceDescription[@"NSScreenNumber"] == [NSNumber numberWithUnsignedInt:displayID]) {
+      return screen.localizedName;
+    }
+  }
+  return nil;
+}
+
 - (id)initWithDisplay:(CGDirectDisplayID)displayID frameRate:(int)frameRate {
   self = [super init];