[camera] Add front camera mirroring update on iOS

packages/camera/camera/CHANGELOG.md

@@ -4,6 +4,7 @@
 * Remove usages of deprecated Android API `CamcorderProfile`.
 * Update gradle version to 7.0.2 on Android.
 * Fix registerTexture and result being called on background thread on iOS.
+* Update front camera mirroring on iOS.
 
 ## 0.9.4+2
 

packages/camera/camera/ios/Classes/CameraPlugin.m

@@ -701,7 +701,171 @@ - (void)captureOutput:(AVCaptureOutput *)output
 
       CVPixelBufferRef nextBuffer = CMSampleBufferGetImageBuffer(sampleBuffer);
       CMTime nextSampleTime = CMTimeSubtract(_lastVideoSampleTime, _videoTimeOffset);
-      [_videoAdaptor appendPixelBuffer:nextBuffer withPresentationTime:nextSampleTime];
+
+      if ([_captureDevice position] == AVCaptureDevicePositionFront) {
+        CVPixelBufferLockBaseAddress(nextBuffer, kCVPixelBufferLock_ReadOnly);
+
+        const Boolean isPlanar = CVPixelBufferIsPlanar(nextBuffer);
+        size_t planeCount;
+        if (isPlanar) {
+          planeCount = CVPixelBufferGetPlaneCount(nextBuffer);
+        } else {
+          planeCount = 1;
+        }
+
+        OSType formatType = CVPixelBufferGetPixelFormatType(nextBuffer);
+
+        if (!isPlanar) {
+          void *planeAddress = CVPixelBufferGetBaseAddress(nextBuffer);
+          size_t bytesPerRow = CVPixelBufferGetBytesPerRow(nextBuffer);
+          size_t height = CVPixelBufferGetHeight(nextBuffer);
+          size_t width = CVPixelBufferGetWidth(nextBuffer);
+
+          void *targetBytes = malloc(height * bytesPerRow);
+          size_t targetBytesPerRow = bytesPerRow;
+
+          vImage_Buffer inBuffer;
+          inBuffer.data = planeAddress;
+          inBuffer.rowBytes = bytesPerRow;
+          inBuffer.width = width;
+          inBuffer.height = height;
+
+          vImage_Buffer outBuffer;
+          outBuffer.data = targetBytes;
+          outBuffer.rowBytes = targetBytesPerRow;
+          outBuffer.width = width;
+          outBuffer.height = height;
+
+          vImage_Error err;
+
+          err = vImageHorizontalReflect_ARGB8888(&inBuffer, &outBuffer, kvImageNoFlags);
+
+          if (err != kvImageNoError) {
+            NSLog(@"vImageHorizontalReflect_ARGB8888 returned %ld", err);
+
+            free(targetBytes);
+            targetBytes = NULL;
+
+            return;
+          }
+
+          CVReturn status;
+          CVPixelBufferRef nnb = NULL;
+
+          status = CVPixelBufferCreateWithBytes(kCFAllocatorDefault, width, height, formatType,
+                                                outBuffer.data, outBuffer.rowBytes, NULL, NULL,
+                                                NULL, &nnb);
+
+          if (status != kCVReturnSuccess) {
+            NSLog(@"CVPixelBufferCreateWithBytes returned %d", status);
+
+            free(targetBytes);
+            targetBytes = NULL;
+
+            return;
+          }
+
+          [_videoAdaptor appendPixelBuffer:nnb withPresentationTime:nextSampleTime];
+
+          free(targetBytes);
+          targetBytes = NULL;
+
+          CVBufferRelease(nnb);
+        } else {
+          uint8_t *planeAddress[planeCount];
+          size_t bytesPerRow[planeCount];
+          size_t height[planeCount];
+          size_t width[planeCount];
+
+          uint8_t *targetAddress[planeCount];
+
+          for (int i = 0; i < planeCount; i++) {
+            planeAddress[i] = CVPixelBufferGetBaseAddressOfPlane(nextBuffer, i);
+            bytesPerRow[i] = CVPixelBufferGetBytesPerRowOfPlane(nextBuffer, i);
+            height[i] = CVPixelBufferGetHeightOfPlane(nextBuffer, i);
+            width[i] = CVPixelBufferGetWidthOfPlane(nextBuffer, i);
+
+            targetAddress[i] = malloc(height[i] * bytesPerRow[i]);
+          }
+
+          size_t wp;
+          size_t hp;
+
+          uint8_t x = bytesPerRow[1] - (width[1] * 2) - 1;
+
+          for (size_t i = 0; i < height[1]; i++) {
+            for (size_t j = 0; j < bytesPerRow[1]; j++) {
+              if (j >= bytesPerRow[1] / 2) {
+                continue;
+              }
+
+              wp = j + (i * bytesPerRow[1]);
+              hp = (bytesPerRow[1] - j - 1) + (bytesPerRow[1] * i);
+
+              targetAddress[1][hp] = planeAddress[1][wp - x];
+              targetAddress[1][wp] = planeAddress[1][hp - x];
+            }
+          }
+
+          vImage_Buffer inBuffer;
+          inBuffer.data = planeAddress[0];
+          inBuffer.rowBytes = bytesPerRow[0];
+          inBuffer.width = width[0];
+          inBuffer.height = height[0];
+
+          vImage_Buffer outBuffer;
+          outBuffer.data = targetAddress[0];
+          outBuffer.rowBytes = bytesPerRow[0];
+          outBuffer.width = width[0];
+          outBuffer.height = height[0];
+
+          vImage_Error err;
+
+          err = vImageHorizontalReflect_Planar8(&inBuffer, &outBuffer, kvImageNoFlags);
+
+          if (err != kvImageNoError) {
+            NSLog(@"vImageHorizontalReflect_Planar8 returned %ld", err);
+
+            for (int i = 0; i < planeCount; i++) {
+              free(targetAddress[i]);
+            }
+
+            return;
+          }
+
+          CVReturn status;
+          CVPixelBufferRef nnb = NULL;
+
+          status =
+              CVPixelBufferCreate(kCFAllocatorDefault, width[0], height[0], formatType, NULL, &nnb);
+
+          if (status != kCVReturnSuccess) {
+            NSLog(@"CVPixelBufferCreate returned %d", status);
+
+            return;
+          }
+
+          CVPixelBufferLockBaseAddress(nnb, kCVPixelBufferLock_ReadOnly);
+          uint8_t *y = CVPixelBufferGetBaseAddressOfPlane(nnb, 0);
+          memcpy(y, targetAddress[0], height[0] * bytesPerRow[0]);
+
+          uint8_t *uv = CVPixelBufferGetBaseAddressOfPlane(nnb, 1);
+          memcpy(uv, targetAddress[1], height[1] * bytesPerRow[1]);
+          CVPixelBufferUnlockBaseAddress(nnb, kCVPixelBufferLock_ReadOnly);
+
+          [_videoAdaptor appendPixelBuffer:nnb withPresentationTime:nextSampleTime];
+
+          for (int i = 0; i < planeCount; i++) {
+            free(targetAddress[i]);
+          }
+
+          CVBufferRelease(nnb);
+        }
+
+        CVPixelBufferUnlockBaseAddress(nextBuffer, kCVPixelBufferLock_ReadOnly);
+      } else {
+        [_videoAdaptor appendPixelBuffer:nextBuffer withPresentationTime:nextSampleTime];
+      }
     } else {
       CMTime dur = CMSampleBufferGetDuration(sampleBuffer);