From 419c62c048cd8b59b15227b47c2d1132acc2b033 Mon Sep 17 00:00:00 2001
From: Andrey Kalugin <jekyl2006@gmail.com>
Date: Mon, 15 Jan 2024 18:55:41 +0100
Subject: [PATCH] Add 'scIsConnected()' method to API to make application
 connection waiting more flexible.

---
 src/softcam/softcam.cpp       |  5 +++++
 src/softcam/softcam.def       |  1 +
 src/softcam/softcam.h         | 10 ++++++++++
 src/softcamcore/SenderAPI.cpp | 10 ++++++++++
 4 files changed, 26 insertions(+)

diff --git a/src/softcam/softcam.cpp b/src/softcam/softcam.cpp
index cb4f771..703e95f 100644
--- a/src/softcam/softcam.cpp
+++ b/src/softcam/softcam.cpp
@@ -176,3 +176,8 @@ extern "C" bool     scWaitForConnection(scCamera camera, float timeout)
 {
     return softcam::sender::WaitForConnection(camera, timeout);
 }
+
+extern "C" bool     scIsConnected(scCamera camera)
+{
+	return softcam::sender::IsConnected(camera);
+}
diff --git a/src/softcam/softcam.def b/src/softcam/softcam.def
index 75f5657..74f533e 100644
--- a/src/softcam/softcam.def
+++ b/src/softcam/softcam.def
@@ -8,3 +8,4 @@ EXPORTS
             scDeleteCamera
             scSendFrame
             scWaitForConnection
+            scIsConnected
diff --git a/src/softcam/softcam.h b/src/softcam/softcam.h
index 8f917fc..01e9746 100644
--- a/src/softcam/softcam.h
+++ b/src/softcam/softcam.h
@@ -74,4 +74,14 @@ extern "C"
         this function returns `false`.
     */
     bool        SOFTCAM_API scWaitForConnection(scCamera camera, float timeout = 0.0f);
+
+    /*
+        This function reports if an application is connected to the specified
+        virtual camera.
+
+        This function returns `true` if the virtual camera has ever been
+        accessed by an application before this function returns. Otherwise,
+        this function returns `false`.
+    */
+	bool        SOFTCAM_API scIsConnected(scCamera camera);
 }
diff --git a/src/softcamcore/SenderAPI.cpp b/src/softcamcore/SenderAPI.cpp
index 8c759b7..defb4e0 100644
--- a/src/softcamcore/SenderAPI.cpp
+++ b/src/softcamcore/SenderAPI.cpp
@@ -111,5 +111,15 @@ bool            WaitForConnection(CameraHandle camera, float timeout)
     return false;
 }
 
+bool            IsConnected(CameraHandle camera)
+{
+	Camera* target = static_cast<Camera*>(camera);
+	if (target && s_camera.load() == target)
+	{
+		return target->m_frame_buffer.connected();
+	}
+	return false;
+}
+
 } //namespace sender
 } //namespace softcam