perf: Avoid expensive CMSampleBuffer copy (#235)

* Don't copy CMSampleBuffer

* Update CameraView+RecordVideo.swift

* Update Podfile.lock

example/ios/Podfile.lock

@@ -322,7 +322,7 @@ PODS:
     - React
   - RNVectorIcons (8.1.0):
     - React-Core
-  - VisionCamera (2.4.2-beta.3):
+  - VisionCamera (2.4.2-beta.7):
     - React
     - React-callinvoker
     - React-Core
@@ -490,7 +490,7 @@ SPEC CHECKSUMS:
   RNReanimated: 9c13c86454bfd54dab7505c1a054470bfecd2563
   RNStaticSafeAreaInsets: 6103cf09647fa427186d30f67b0f5163c1ae8252
   RNVectorIcons: 31cebfcf94e8cf8686eb5303ae0357da64d7a5a4
-  VisionCamera: 33eb4044a1bee72eac4e1ad26a64b30b5ffe41a6
+  VisionCamera: d65c038e7a538fbd719f3ff3e7511a2c71111e3a
   Yoga: 575c581c63e0d35c9a83f4b46d01d63abc1100ac
 
 PODFILE CHECKSUM: 4b093c1d474775c2eac3268011e4b0b80929d3a2

ios/CameraView+RecordVideo.swift

@@ -215,23 +215,13 @@ extension CameraView: AVCaptureVideoDataOutputSampleBufferDelegate, AVCaptureAud
       if diff > UInt64(nanosecondsPerFrame) {
         if !isRunningFrameProcessor {
           // we're not in the middle of executing the Frame Processor, so prepare for next call.
-          var bufferCopy: CMSampleBuffer?
+          CameraQueues.frameProcessorQueue.async {
-          CMSampleBufferCreateCopy(allocator: kCFAllocatorDefault,
+            self.isRunningFrameProcessor = true
-                                   sampleBuffer: sampleBuffer,
+            let frame = Frame(buffer: sampleBuffer, orientation: self.bufferOrientation)
-                                   sampleBufferOut: &bufferCopy)
+            frameProcessor(frame)
-          if let bufferCopy = bufferCopy {
+            self.isRunningFrameProcessor = false
-            // successfully copied buffer, dispatch frame processor call.
-            CameraQueues.frameProcessorQueue.async {
-              self.isRunningFrameProcessor = true
-              let frame = Frame(buffer: bufferCopy, orientation: self.bufferOrientation)
-              frameProcessor(frame)
-              self.isRunningFrameProcessor = false
-            }
-            lastFrameProcessorCall = DispatchTime.now()
-          } else {
-            // failed to create a buffer copy.
-            ReactLogger.log(level: .error, message: "Failed to copy buffer! Frame Processor cannot be called.", alsoLogToJS: true)
           }
+          lastFrameProcessorCall = DispatchTime.now()
         } else {
           // we're still in the middle of executing a Frame Processor for a previous frame, notify user about dropped frame.
           if !hasLoggedFrameProcessorFrameDropWarning {