react-native-vision-camera/package/ios/Frame Processor/Frame.m

//
//  Frame.m
//  VisionCamera
//
//  Created by Marc Rousavy on 08.06.21.
//  Copyright © 2021 mrousavy. All rights reserved.
//

#import "Frame.h"
#import <CoreMedia/CMSampleBuffer.h>
#import <Foundation/Foundation.h>

@implementation Frame {
  CMSampleBufferRef _Nonnull buffer;
  UIImageOrientation orientation;
}

- (instancetype)initWithBuffer:(CMSampleBufferRef _Nonnull)buffer orientation:(UIImageOrientation)orientation {
  self = [super init];
  if (self) {
    _buffer = buffer;
    _orientation = orientation;
    CFRetain(buffer);
  }
  return self;
}

- (void)dealloc {
  CFRelease(_buffer);
}

@synthesize buffer = _buffer;
@synthesize orientation = _orientation;

- (NSString*)pixelFormat {
  CMFormatDescriptionRef format = CMSampleBufferGetFormatDescription(_buffer);
  FourCharCode mediaType = CMFormatDescriptionGetMediaSubType(format);
  switch (mediaType) {
    case kCVPixelFormatType_32BGRA:
    case kCVPixelFormatType_Lossy_32BGRA:
      return @"rgb";
    case kCVPixelFormatType_420YpCbCr8BiPlanarFullRange:
    case kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange:
    case kCVPixelFormatType_420YpCbCr10BiPlanarFullRange:
    case kCVPixelFormatType_420YpCbCr10BiPlanarVideoRange:
    case kCVPixelFormatType_Lossy_420YpCbCr8BiPlanarFullRange:
    case kCVPixelFormatType_Lossy_420YpCbCr8BiPlanarVideoRange:
    case kCVPixelFormatType_Lossy_420YpCbCr10PackedBiPlanarVideoRange:
      return @"yuv";
    default:
      return @"unknown";
  }
}

- (BOOL)isMirrored {
  switch (_orientation) {
    case UIImageOrientationUp:
    case UIImageOrientationDown:
    case UIImageOrientationLeft:
    case UIImageOrientationRight:
      return false;
    case UIImageOrientationDownMirrored:
    case UIImageOrientationUpMirrored:
    case UIImageOrientationLeftMirrored:
    case UIImageOrientationRightMirrored:
      return true;
  }
}

- (BOOL)isValid {
  return _buffer != nil && CMSampleBufferIsValid(_buffer);
}

- (size_t)width {
  CVPixelBufferRef imageBuffer = CMSampleBufferGetImageBuffer(_buffer);
  return CVPixelBufferGetWidth(imageBuffer);
}

- (size_t)height {
  CVPixelBufferRef imageBuffer = CMSampleBufferGetImageBuffer(_buffer);
  return CVPixelBufferGetHeight(imageBuffer);
}

- (double)timestamp {
  CMTime timestamp = CMSampleBufferGetPresentationTimeStamp(_buffer);
  return CMTimeGetSeconds(timestamp) * 1000.0;
}

- (size_t)bytesPerRow {
  CVPixelBufferRef imageBuffer = CMSampleBufferGetImageBuffer(_buffer);
  return CVPixelBufferGetBytesPerRow(imageBuffer);
}

- (size_t)planesCount {
  CVPixelBufferRef imageBuffer = CMSampleBufferGetImageBuffer(_buffer);
  return CVPixelBufferGetPlaneCount(imageBuffer);
}

@end