mac-avcapture: Ability to directly add iOS devices over USB

Closes jp9000/obs-studio#869

plugins/mac-avcapture/CMakeLists.txt

@@ -6,12 +6,14 @@ find_library(COREFOUNDATION CoreFoundation)
 find_library(COREMEDIA CoreMedia)
 find_library(COREVIDEO CoreVideo)
 find_library(COCOA Cocoa)
+find_library(COREMEDIAIO CoreMediaIO)
 
 include_directories(${AVFOUNDATION}
                     ${COCOA}
                     ${COREFOUNDATION}
                     ${COREMEDIA}
                     ${COREVIDEO}
+                    ${COREMEDIAIO}
 		    ${COCOA})
 
 set(mac-avcapture_HEADERS
@@ -36,6 +38,7 @@ target_link_libraries(mac-avcapture
 	${COREFOUNDATION}
 	${COREMEDIA}
 	${COREVIDEO}
+	${COREMEDIAIO}
 	${COCOA})
 
 install_obs_plugin_with_data(mac-avcapture data)

plugins/mac-avcapture/av-capture.mm

@@ -2,6 +2,7 @@
 #import <CoreFoundation/CoreFoundation.h>
 #import <CoreMedia/CoreMedia.h>
 #import <CoreVideo/CoreVideo.h>
+#import <CoreMediaIO/CMIOHardware.h>
 
 #include <obs-module.h>
 #include <obs.hpp>
@@ -780,7 +781,7 @@ static bool init_format(av_capture *capture, AVCaptureDevice *dev)
 	CMMediaType mtype = CMFormatDescriptionGetMediaType(
 			format.formatDescription);
 	// TODO: support other media types
-	if (mtype != kCMMediaType_Video) {
+	if (mtype != kCMMediaType_Video && mtype != kCMMediaType_Muxed) {
 		AVLOG(LOG_ERROR, "CMMediaType '%s' is unsupported",
 				AV_FOURCC_STR(mtype));
 		return false;
@@ -1247,7 +1248,7 @@ static NSArray *presets(void)
 		AVCaptureSessionPreset640x480,
 		AVCaptureSessionPreset352x288,
 		AVCaptureSessionPreset320x240,
-		//AVCaptureSessionPresetHigh,
+		AVCaptureSessionPresetHigh,
 		//AVCaptureSessionPresetMedium,
 		//AVCaptureSessionPresetLow,
 		//AVCaptureSessionPresetPhoto,
@@ -1265,6 +1266,7 @@ static NSString *preset_names(NSString *preset)
 		AVCaptureSessionPreset640x480:@"640x480",
 		AVCaptureSessionPreset960x540:@"960x540",
 		AVCaptureSessionPreset1280x720:@"1280x720",
+		AVCaptureSessionPresetHigh:@"High",
 	};
 	NSString *name = preset_names[preset];
 	if (name)
@@ -2080,11 +2082,15 @@ static obs_properties_t *av_capture_properties(void *capture)
 			TEXT_DEVICE, OBS_COMBO_TYPE_LIST,
 			OBS_COMBO_FORMAT_STRING);
 	obs_property_list_add_string(dev_list, "", "");
+
 	for (AVCaptureDevice *dev in [AVCaptureDevice
-			devicesWithMediaType:AVMediaTypeVideo]) {
-		obs_property_list_add_string(dev_list,
-				dev.localizedName.UTF8String,
-				dev.uniqueID.UTF8String);
+			devices]) {
+		if ([dev hasMediaType: AVMediaTypeVideo] ||
+		    [dev hasMediaType: AVMediaTypeMuxed]) {
+			obs_property_list_add_string(dev_list,
+					dev.localizedName.UTF8String,
+					dev.uniqueID.UTF8String);
+		}
 	}
 
 	obs_property_set_modified_callback(dev_list,
@@ -2178,6 +2184,20 @@ OBS_MODULE_USE_DEFAULT_LOCALE("mac-avcapture", "en-US")
 
 bool obs_module_load(void)
 {
+#ifdef __MAC_10_10
+	// Enable iOS device to show up as AVCapture devices
+	// From WWDC video 2014 #508 at 5:34
+	// https://developer.apple.com/videos/wwdc/2014/#508
+	CMIOObjectPropertyAddress prop = {
+			kCMIOHardwarePropertyAllowScreenCaptureDevices,
+			kCMIOObjectPropertyScopeGlobal,
+			kCMIOObjectPropertyElementMaster
+	};
+	UInt32 allow = 1;
+	CMIOObjectSetPropertyData(kCMIOObjectSystemObject, &prop, 0, NULL,
+			sizeof(allow), &allow);
+#endif
+
 	obs_source_info av_capture_info = {
 		.id             = "av_capture_input",
 		.type           = OBS_SOURCE_TYPE_INPUT,