snapshot of https://github.com/jitsi/jitsi-meet.git @ fd1749dd28f4138aa80234fc7f311b19aaffa0e7 (2026-09-15)

ios/app/broadcast-extension/SampleUploader.swift

@@ -0,0 +1,154 @@
+/*
+ * Copyright @ 2021-present 8x8, Inc.
+ *
+ * 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
+import ReplayKit
+
+private enum Constants {
+    static let bufferMaxLength = 10240
+}
+
+class SampleUploader {
+    
+    private static var imageContext = CIContext(options: nil)
+    
+    @Atomic private var isReady: Bool = false
+    private var connection: SocketConnection
+  
+    private var dataToSend: Data?
+    private var byteIndex = 0
+  
+    private let serialQueue: DispatchQueue
+    
+    init(connection: SocketConnection) {
+        self.connection = connection
+        self.serialQueue = DispatchQueue(label: "org.jitsi.meet.broadcast.sampleUploader")
+      
+        setupConnection()
+    }
+  
+    @discardableResult func send(sample buffer: CMSampleBuffer) -> Bool {
+        guard isReady == true else {
+            return false
+        }
+        
+        isReady = false
+
+        dataToSend = prepare(sample: buffer)
+        byteIndex = 0
+
+        serialQueue.async { [weak self] in
+            self?.sendDataChunk()
+        }
+        
+        return true
+    }
+}
+
+private extension SampleUploader {
+    
+    func setupConnection() {
+        connection.didOpen = { [weak self] in
+            self?.isReady = true
+        }
+        connection.streamHasSpaceAvailable = { [weak self] in
+            self?.serialQueue.async {
+                self?.isReady = !(self?.sendDataChunk() ?? true)
+            }
+        }
+    }
+    
+    @discardableResult func sendDataChunk() -> Bool {
+        guard let dataToSend = dataToSend else {
+            return false
+        }
+      
+        var bytesLeft = dataToSend.count - byteIndex
+        var length = bytesLeft > Constants.bufferMaxLength ? Constants.bufferMaxLength : bytesLeft
+
+        length = dataToSend[byteIndex..<(byteIndex + length)].withUnsafeBytes {
+            guard let ptr = $0.bindMemory(to: UInt8.self).baseAddress else {
+                return 0
+            }
+          
+            return connection.writeToStream(buffer: ptr, maxLength: length)
+        }
+
+        if length > 0 {
+            byteIndex += length
+            bytesLeft -= length
+
+            if bytesLeft == 0 {
+                self.dataToSend = nil
+                byteIndex = 0
+            }
+        } else {
+            print("writeBufferToStream failure")
+        }
+      
+        return true
+    }
+    
+    func prepare(sample buffer: CMSampleBuffer) -> Data? {
+        guard let imageBuffer = CMSampleBufferGetImageBuffer(buffer) else {
+            print("image buffer not available")
+            return nil
+        }
+        
+        CVPixelBufferLockBaseAddress(imageBuffer, .readOnly)
+        
+        let scaleFactor = 2.0
+        let width = CVPixelBufferGetWidth(imageBuffer)/Int(scaleFactor)
+        let height = CVPixelBufferGetHeight(imageBuffer)/Int(scaleFactor)
+        let orientation = CMGetAttachment(buffer, key: RPVideoSampleOrientationKey as CFString, attachmentModeOut: nil)?.uintValue ?? 0
+                                    
+        let scaleTransform = CGAffineTransform(scaleX: CGFloat(1.0/scaleFactor), y: CGFloat(1.0/scaleFactor))
+        let bufferData = self.jpegData(from: imageBuffer, scale: scaleTransform)
+        
+        CVPixelBufferUnlockBaseAddress(imageBuffer, .readOnly)
+        
+        guard let messageData = bufferData else {
+            print("corrupted image buffer")
+            return nil
+        }
+              
+        let httpResponse = CFHTTPMessageCreateResponse(nil, 200, nil, kCFHTTPVersion1_1).takeRetainedValue()
+        CFHTTPMessageSetHeaderFieldValue(httpResponse, "Content-Length" as CFString, String(messageData.count) as CFString)
+        CFHTTPMessageSetHeaderFieldValue(httpResponse, "Buffer-Width" as CFString, String(width) as CFString)
+        CFHTTPMessageSetHeaderFieldValue(httpResponse, "Buffer-Height" as CFString, String(height) as CFString)
+        CFHTTPMessageSetHeaderFieldValue(httpResponse, "Buffer-Orientation" as CFString, String(orientation) as CFString)
+        
+        CFHTTPMessageSetBody(httpResponse, messageData as CFData)
+        
+        let serializedMessage = CFHTTPMessageCopySerializedMessage(httpResponse)?.takeRetainedValue() as Data?
+      
+        return serializedMessage
+    }
+    
+    func jpegData(from buffer: CVPixelBuffer, scale scaleTransform: CGAffineTransform) -> Data? {
+        var image = CIImage(cvPixelBuffer: buffer)
+        image = image.transformed(by: scaleTransform)
+        
+        guard let colorSpace = image.colorSpace else {
+            return nil
+        }
+      
+        let options: [CIImageRepresentationOption: Float] = [kCGImageDestinationLossyCompressionQuality as CIImageRepresentationOption: 1.0]
+        let imageData = SampleUploader.imageContext.jpegRepresentation(of: image, colorSpace: colorSpace, options: options)
+      
+        return imageData
+    }
+}