[Mac] feat: Support screen capture for macOS.

sdk/BUILD.gn

@@ -619,6 +619,43 @@ if (is_ios || is_mac) {
         "../rtc_base/system:gcd_helpers",
       ]
     }
+
+    rtc_library("desktopcapture_objc") {
+      visibility = [ "*" ]
+      sources = [
+        "objc/components/capturer/RTCDesktopCapturer+Prvate.h",
+        "objc/components/capturer/RTCDesktopCapturer.h",
+        "objc/components/capturer/RTCDesktopCapturer.mm",
+        "objc/components/capturer/RTCDesktopSource+Prvate.h",
+        "objc/components/capturer/RTCDesktopSource.h",
+        "objc/components/capturer/RTCDesktopSource.mm",
+        "objc/components/capturer/RTCDesktopMediaList+Prvate.h",
+        "objc/components/capturer/RTCDesktopMediaList.h",
+        "objc/components/capturer/RTCDesktopMediaList.mm",
+        "objc/native/src/objc_desktop_capture.h",
+        "objc/native/src/objc_desktop_capture.mm",
+        "objc/native/src/objc_desktop_media_list.h",
+        "objc/native/src/objc_desktop_media_list.mm",
+      ]
+      frameworks = [ 
+        "AppKit.framework",
+      ]
+
+      configs += [ "..:common_objc" ]
+
+      public_configs = [ ":common_config_objc" ]
+
+      deps = [
+        ":base_objc",
+        ":helpers_objc",
+        ":videoframebuffer_objc",
+        "../rtc_base/system:gcd_helpers",
+        "../modules/desktop_capture",
+      ]
+      if(is_mac) {
+        deps += [ "//third_party:jpeg", ]
+      }
+    }
 
     rtc_library("videocodec_objc") {
       visibility = [ "*" ]
@@ -1455,6 +1492,9 @@ if (is_ios || is_mac) {
           "objc/base/RTCYUVPlanarBuffer.h",
           "objc/components/capturer/RTCCameraVideoCapturer.h",
           "objc/components/capturer/RTCFileVideoCapturer.h",
+          "objc/components/capturer/RTCDesktopCapturer.h",
+          "objc/components/capturer/RTCDesktopSource.h",
+          "objc/components/capturer/RTCDesktopMediaList.h",
           "objc/components/renderer/metal/RTCMTLNSVideoView.h",
           "objc/components/renderer/opengl/RTCNSGLVideoView.h",
           "objc/components/renderer/opengl/RTCVideoViewShading.h",
@@ -1488,6 +1528,7 @@ if (is_ios || is_mac) {
           ":opengl_ui_objc",
           ":peerconnectionfactory_base_objc",
           ":videocapture_objc",
+          ":desktopcapture_objc",
           ":videocodec_objc",
           ":videotoolbox_objc",
           "../rtc_base:rtc_base_approved",

sdk/objc/components/capturer/RTCDesktopCapturer+Private.h

@@ -0,0 +1,29 @@
+/*
+ * Copyright 2022 LiveKit
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#import "RTCDesktopCapturer.h"
+
+#include "sdk/objc/native/src/objc_desktop_capture.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface RTCDesktopCapturer ()
+
+@property(nonatomic, readonly)std::shared_ptr<webrtc::ObjCDesktopCapturer> nativeCapturer;
+
+@end
+
+NS_ASSUME_NONNULL_END

sdk/objc/components/capturer/RTCDesktopCapturer.h

@@ -0,0 +1,54 @@
+/*
+ * Copyright 2022 LiveKit
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#import <AVFoundation/AVFoundation.h>
+#import <Foundation/Foundation.h>
+
+#import "RTCMacros.h"
+#import "RTCVideoCapturer.h"
+#import "RTCDesktopSource.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+RTC_OBJC_EXPORT
+@protocol RTC_OBJC_TYPE
+(DesktopCapturerDelegate)<NSObject>
+- (void)didCaptureVideoFrame:(RTC_OBJC_TYPE(RTCVideoFrame) *) frame;
+@end
+
+RTC_OBJC_EXPORT
+// Screen capture that implements RTCVideoCapturer. Delivers frames to a
+// RTCVideoCapturerDelegate (usually RTCVideoSource).
+@interface RTC_OBJC_TYPE (RTCDesktopCapturer) : RTC_OBJC_TYPE(RTCVideoCapturer)
+
+@property(nonatomic, readonly) RTCDesktopSource *source;
+
+- (instancetype)initWithSource:(RTCDesktopSource*)source delegate:(__weak id<RTC_OBJC_TYPE(RTCVideoCapturerDelegate)>)delegate;
+
+- (instancetype)initWithDefaultScreen:(__weak id<RTC_OBJC_TYPE(RTCVideoCapturerDelegate)>)delegate;
+
+// Starts the capture session asynchronously.
+- (void)startCapture:(NSInteger)fps;
+
+// Stops the capture session asynchronously.
+- (void)stopCapture;
+
+- (void)didCaptureVideoFrame
+    : (RTC_OBJC_TYPE(RTCVideoFrame) *)frame;
+
+@end
+
+NS_ASSUME_NONNULL_END

sdk/objc/components/capturer/RTCDesktopCapturer.mm

@@ -0,0 +1,73 @@
+/*
+ * Copyright 2022 LiveKit
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#import <Foundation/Foundation.h>
+
+#import "base/RTCLogging.h"
+#import "base/RTCVideoFrameBuffer.h"
+
+#import "components/video_frame_buffer/RTCCVPixelBuffer.h"
+
+#import "RTCDesktopCapturer.h"
+#import "RTCDesktopCapturer+Private.h"
+#import "RTCDesktopSource+Private.h"
+
+@implementation RTC_OBJC_TYPE (RTCDesktopCapturer) {
+}
+
+@synthesize nativeCapturer = _nativeCapturer;
+@synthesize source = _source;
+
+- (instancetype)initWithSource:(RTCDesktopSource*)source delegate:(__weak id<RTC_OBJC_TYPE(RTCVideoCapturerDelegate)>)delegate {
+    if (self = [super initWithDelegate:delegate]) {
+      webrtc::ObjCDesktopCapturer::DesktopType captureType = webrtc::ObjCDesktopCapturer::kScreen;
+      if(source.sourceType == RTCDesktopSourceTypeWindow) {
+          captureType = webrtc::ObjCDesktopCapturer::kWindow;
+      }
+      _nativeCapturer = std::make_shared<webrtc::ObjCDesktopCapturer>(captureType, source.nativeMediaSource->id(), self);
+      _source = source;
+  }
+  return self;
+}
+
+- (instancetype)initWithDefaultScreen:(__weak id<RTC_OBJC_TYPE(RTCVideoCapturerDelegate)>)delegate {
+    if (self = [super initWithDelegate:delegate]) {
+      _nativeCapturer = std::make_unique<webrtc::ObjCDesktopCapturer>(webrtc::ObjCDesktopCapturer::kScreen, -1, self);
+      _source = nil;
+  }
+  return self;
+}
+
+
+-(void)dealloc {
+    _nativeCapturer->Stop();
+    _nativeCapturer = nullptr;
+}
+
+- (void)startCapture:(NSInteger)fps {
+    _nativeCapturer->Start();
+}
+
+- (void)didCaptureVideoFrame
+    : (RTC_OBJC_TYPE(RTCVideoFrame) *)frame {
+        [self.delegate capturer:self didCaptureVideoFrame:frame];
+}
+
+- (void)stopCapture {
+    _nativeCapturer->Stop();
+}
+
+@end

sdk/objc/components/capturer/RTCDesktopMediaList+Private.h

@@ -0,0 +1,41 @@
+/*
+ * Copyright 2022 LiveKit
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#import "RTCDesktopMediaList.h"
+
+namespace webrtc {
+    class ObjCDesktopMediaList;
+}
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface RTCDesktopMediaList ()
+
+@property(nonatomic, readonly)std::shared_ptr<webrtc::ObjCDesktopMediaList> nativeMediaList;
+
+-(void)mediaSourceAdded:(int)index;
+
+-(void)mediaSourceRemoved:(int)index;
+
+-(void)mediaSourceMoved:(int) oldIndex newIndex:(int) newIndex;
+
+-(void)mediaSourceNameChanged:(int)index;
+
+-(void)mediaSourceThumbnailChanged:(int)index;
+
+@end
+
+NS_ASSUME_NONNULL_END

sdk/objc/components/capturer/RTCDesktopMediaList.h

@@ -0,0 +1,47 @@
+/*
+ * Copyright 2022 LiveKit
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#import <AVFoundation/AVFoundation.h>
+#import <Foundation/Foundation.h>
+
+#import "RTCMacros.h"
+#import "RTCDesktopSource.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+RTC_OBJC_EXPORT
+@protocol RTC_OBJC_TYPE(RTCDesktopMediaListDelegate)<NSObject>
+-(void)mediaSourceAdded:(int)index fromSource:(RTCDesktopSource *) source;
+-(void)mediaSourceRemoved:(int)index fromSource:(RTCDesktopSource *) source;
+-(void)mediaSourceMoved:(int) oldIndex newIndex:(int) newIndex fromSource:(RTCDesktopSource *) source;
+-(void)mediaSourceNameChanged:(int)index fromSource:(RTCDesktopSource *) source;
+-(void)mediaSourceThumbnailChanged:(int)index fromSource:(RTCDesktopSource *) source;
+@end
+
+RTC_OBJC_EXPORT
+@interface RTC_OBJC_TYPE (RTCDesktopMediaList) : NSObject
+
+-(instancetype)initWithDelegate:(__weak id<RTC_OBJC_TYPE(RTCDesktopMediaListDelegate)>)delegate type:(RTCDesktopSourceType)type;
+
+@property(nonatomic, readonly) RTCDesktopSourceType sourceType;
+
+- (int32_t)UpdateSourceList;
+
+- (NSArray<RTCDesktopSource *>*) getSources;
+
+@end
+
+NS_ASSUME_NONNULL_END