Added MPPImageUtils
This commit is contained in:
Prianka Liz Kariat
parent
acba3ab26d
commit
02734b3add
24
mediapipe/tasks/ios/vision/core/utils/BUILD
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24
mediapipe/tasks/ios/vision/core/utils/BUILD
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package(default_visibility = ["//mediapipe/tasks:internal"])
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licenses(["notice"])
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objc_library(
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name = "MPPImageUtils",
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srcs = ["sources/MPPImage+Utils.m"],
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hdrs = ["sources/MPPImage+Utils.h"],
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module_name = "MPPImageUtils",
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sdk_frameworks = [
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"Accelerate",
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"CoreGraphics",
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"CoreImage",
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"CoreVideo",
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],
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deps = [
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"//mediapipe/tasks/ios/common/utils:MPPCommonUtils",
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"//mediapipe/tasks/ios/vision/core:MPPImage",
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],
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copts = [
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"-ObjC++",
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"-std=c++17",
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],
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)
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// Copyright 2023 The MediaPipe Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#import <Foundation/Foundation.h>
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#import "mediapipe/tasks/ios/vision/core/sources/MPPImage.h"
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NS_ASSUME_NONNULL_BEGIN
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/** Helper utility for performing operations on MPPImage specific to the
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* MediaPipe Vision library.
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*/
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@interface MPPImage (Utils)
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// /** Bitmap size of the image. */
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@property(nonatomic, readonly) CGSize bitmapSize;
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/**
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* Returns the underlying uint8 pixel buffer of an `MPPImage`.
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* Irrespective of whether the underlying buffer is grayscale, RGB, RGBA, BGRA etc., the pixel
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* data is converted to an RGB format. In case of grayscale images, the mono channel is duplicated
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* in the R, G, B channels.
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*
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* @param error Pointer to the memory location where errors if any should be
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* saved. If @c NULL, no error will be saved.
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*
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* @return The underlying pixel buffer of the `MPPImage` or nil in case of errors.
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*/
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- (nullable uint8_t *)rgbPixelDataWithError:(NSError **)error;
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@end
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NS_ASSUME_NONNULL_END
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324
mediapipe/tasks/ios/vision/core/utils/sources/MPPImage+Utils.m
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324
mediapipe/tasks/ios/vision/core/utils/sources/MPPImage+Utils.m
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// Copyright 2023 The MediaPipe Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#import "mediapipe/tasks/ios/vision/core/utils/sources/MPPImage+Utils.h"
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#import "mediapipe/tasks/ios/common/sources/MPPCommon.h"
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#import "mediapipe/tasks/ios/common/utils/sources/MPPCommonUtils.h"
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#import <Accelerate/Accelerate.h>
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#import <CoreGraphics/CoreGraphics.h>
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#import <CoreImage/CoreImage.h>
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#import <CoreVideo/CoreVideo.h>
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@interface MPPPixelDataUtils : NSObject
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+ (uint8_t *)rgbPixelDatafromPixelData:(uint8_t *)pixelData
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withWidth:(size_t)width
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height:(size_t)height
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stride:(size_t)stride
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pixelBufferFormat:(OSType)pixelBufferFormatType
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error:(NSError **)error;
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@end
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@interface MPPCVPixelBufferUtils : NSObject
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+ (uint8_t *)pixelDataFromCVPixelBuffer:(CVPixelBufferRef)pixelBuffer error:(NSError **)error;
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@end
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@interface MPPCGImageUtils : NSObject
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+ (UInt8 *_Nullable)pixelDataFromCGImage:(CGImageRef)cgImage error:(NSError **)error;
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@end
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@interface UIImage (RawPixelDataUtils)
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@property(nonatomic, readonly) CGSize bitmapSize;
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- (uint8_t *)pixelDataWithError:(NSError **)error;
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@end
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@implementation MPPPixelDataUtils : NSObject
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+ (uint8_t *)rgbPixelDatafromPixelData:(uint8_t *)pixelData
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withWidth:(size_t)width
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height:(size_t)height
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stride:(size_t)stride
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pixelBufferFormat:(OSType)pixelBufferFormatType
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error:(NSError **)error {
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NSInteger destinationChannelCount = 3;
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size_t destinationBytesPerRow = width * destinationChannelCount;
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uint8_t *destPixelBufferAddress =
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(uint8_t *)[MPPCommonUtils mallocWithSize:sizeof(uint8_t) * height * destinationBytesPerRow
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error:error];
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if (!destPixelBufferAddress) {
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return NULL;
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}
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vImage_Buffer srcBuffer = {.data = pixelData,
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.height = (vImagePixelCount)height,
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.width = (vImagePixelCount)width,
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.rowBytes = stride};
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vImage_Buffer destBuffer = {.data = destPixelBufferAddress,
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.height = (vImagePixelCount)height,
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.width = (vImagePixelCount)width,
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.rowBytes = destinationBytesPerRow};
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vImage_Error convertError = kvImageNoError;
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switch (pixelBufferFormatType) {
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case kCVPixelFormatType_32RGBA: {
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convertError = vImageConvert_RGBA8888toRGB888(&srcBuffer, &destBuffer, kvImageNoFlags);
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break;
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}
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case kCVPixelFormatType_32BGRA: {
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convertError = vImageConvert_BGRA8888toRGB888(&srcBuffer, &destBuffer, kvImageNoFlags);
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break;
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}
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default: {
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[MPPCommonUtils createCustomError:error
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withCode:MPPTasksErrorCodeInvalidArgumentError
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description:@"Invalid source pixel buffer format. Expecting one of "
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@"kCVPixelFormatType_32RGBA, kCVPixelFormatType_32BGRA"];
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free(destPixelBufferAddress);
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return NULL;
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}
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}
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if (convertError != kvImageNoError) {
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[MPPCommonUtils createCustomError:error
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withCode:MPPTasksErrorCodeInternalError
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description:@"Image format conversion failed."];
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free(destPixelBufferAddress);
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return NULL;
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}
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return destPixelBufferAddress;
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}
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@end
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@implementation MPPCVPixelBufferUtils
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+ (uint8_t *)rgbPixelDatafromCVPixelBuffer:(CVPixelBufferRef)pixelBuffer error:(NSError **)error {
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CVPixelBufferLockBaseAddress(pixelBuffer, 0);
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uint8_t *rgbPixelData = [MPPPixelDataUtils
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rgbPixelDatafromPixelData:(uint8_t *)CVPixelBufferGetBaseAddress(pixelBuffer)
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withWidth:CVPixelBufferGetWidth(pixelBuffer)
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height:CVPixelBufferGetHeight(pixelBuffer)
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stride:CVPixelBufferGetBytesPerRow(pixelBuffer)
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pixelBufferFormat:CVPixelBufferGetPixelFormatType(pixelBuffer)
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error:error];
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CVPixelBufferUnlockBaseAddress(pixelBuffer, 0);
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return rgbPixelData;
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}
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+ (nullable uint8_t *)pixelDataFromCVPixelBuffer:(CVPixelBufferRef)pixelBuffer
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error:(NSError **)error {
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uint8_t *pixelData = NULL;
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OSType pixelBufferFormat = CVPixelBufferGetPixelFormatType(pixelBuffer);
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switch (pixelBufferFormat) {
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case kCVPixelFormatType_32BGRA: {
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pixelData = [MPPCVPixelBufferUtils rgbPixelDatafromCVPixelBuffer:pixelBuffer error:error];
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break;
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}
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default: {
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[MPPCommonUtils createCustomError:error
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withCode:MPPTasksErrorCodeInvalidArgumentError
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description:@"Unsupported pixel format for CVPixelBuffer. Supported "
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@"pixel format types are kCVPixelFormatType_32BGRA"];
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}
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}
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return pixelData;
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}
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@end
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@implementation MPPCGImageUtils
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+ (UInt8 *_Nullable)pixelDataFromCGImage:(CGImageRef)cgImage error:(NSError **)error {
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size_t width = CGImageGetWidth(cgImage);
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size_t height = CGImageGetHeight(cgImage);
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NSInteger bitsPerComponent = 8;
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NSInteger channelCount = 4;
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UInt8 *pixel_data_to_return = NULL;
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CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
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size_t bytesPerRow = channelCount * width;
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// iOS infers bytesPerRow if it is set to 0.
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// See https://developer.apple.com/documentation/coregraphics/1455939-cgbitmapcontextcreate
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// But for segmentation test image, this was not the case.
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// Hence setting it to the value of channelCount*width.
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// kCGImageAlphaNoneSkipLast specifies that Alpha will always be next to B.
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// kCGBitmapByteOrder32Big specifies that R will be stored before B.
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// In combination they signify a pixelFormat of kCVPixelFormatType32RGBA.
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CGBitmapInfo bitMapinfoFor32RGBA = kCGImageAlphaNoneSkipLast | kCGBitmapByteOrder32Big;
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CGContextRef context = CGBitmapContextCreate(nil, width, height, bitsPerComponent, bytesPerRow,
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colorSpace, bitMapinfoFor32RGBA);
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if (context) {
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CGContextDrawImage(context, CGRectMake(0, 0, width, height), cgImage);
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uint8_t *srcData = (uint8_t *)CGBitmapContextGetData(context);
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if (srcData) {
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// We have drawn the image as an RGBA image with 8 bitsPerComponent and hence can safely input
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// a pixel format of type kCVPixelFormatType_32RGBA for conversion by vImage.
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pixel_data_to_return = [MPPPixelDataUtils rgbPixelDatafromPixelData:srcData
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withWidth:width
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height:height
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stride:bytesPerRow
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pixelBufferFormat:kCVPixelFormatType_32RGBA
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error:error];
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}
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CGContextRelease(context);
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}
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CGColorSpaceRelease(colorSpace);
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return pixel_data_to_return;
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}
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@end
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@implementation UIImage (RawPixelDataUtils)
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- (uint8_t *)pixelDataFromCIImageWithError:(NSError **)error {
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uint8_t *pixelData = NULL;
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if (self.CIImage.pixelBuffer) {
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pixelData = [MPPCVPixelBufferUtils pixelDataFromCVPixelBuffer:self.CIImage.pixelBuffer
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error:error];
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} else if (self.CIImage.CGImage) {
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pixelData = [MPPCGImageUtils pixelDataFromCGImage:self.CIImage.CGImage error:error];
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} else {
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[MPPCommonUtils createCustomError:error
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withCode:MPPTasksErrorCodeInvalidArgumentError
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description:@"CIImage should have CGImage or CVPixelBuffer info."];
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}
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return pixelData;
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}
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- (uint8_t *)pixelDataWithError:(NSError **)error {
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uint8_t *pixelData = nil;
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if (self.CGImage) {
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pixelData = [MPPCGImageUtils pixelDataFromCGImage:self.CGImage error:error];
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} else if (self.CIImage) {
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pixelData = [self pixelDataFromCIImageWithError:error];
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} else {
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[MPPCommonUtils createCustomError:error
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withCode:MPPTasksErrorCodeInvalidArgumentError
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description:@"UIImage should be initialized from"
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" CIImage or CGImage."];
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}
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return pixelData;
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}
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- (CGSize)bitmapSize {
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CGFloat width = 0;
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CGFloat height = 0;
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if (self.CGImage) {
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width = CGImageGetWidth(self.CGImage);
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height = CGImageGetHeight(self.CGImage);
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} else if (self.CIImage.pixelBuffer) {
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width = CVPixelBufferGetWidth(self.CIImage.pixelBuffer);
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height = CVPixelBufferGetHeight(self.CIImage.pixelBuffer);
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} else if (self.CIImage.CGImage) {
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width = CGImageGetWidth(self.CIImage.CGImage);
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height = CGImageGetHeight(self.CIImage.CGImage);
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}
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return CGSizeMake(width, height);
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}
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@end
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@implementation MPPImage (Utils)
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- (nullable uint8_t *)pixelDataWithError:(NSError **)error {
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uint8_t *pixelData = NULL;
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switch (self.imageSourceType) {
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case MPPImageSourceTypeSampleBuffer: {
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CVPixelBufferRef sampleImagePixelBuffer = CMSampleBufferGetImageBuffer(self.sampleBuffer);
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pixelData = [MPPCVPixelBufferUtils pixelDataFromCVPixelBuffer:sampleImagePixelBuffer
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error:error];
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break;
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}
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case MPPImageSourceTypePixelBuffer: {
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pixelData = [MPPCVPixelBufferUtils pixelDataFromCVPixelBuffer:self.pixelBuffer error:error];
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break;
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}
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case MPPImageSourceTypeImage: {
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pixelData = [self.image pixelDataWithError:error];
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break;
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}
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default:
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[MPPCommonUtils createCustomError:error
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withCode:MPPTasksErrorCodeInvalidArgumentError
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description:@"Invalid source type for MPPImage."];
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}
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return pixelData;
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}
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- (CGSize)bitmapSize {
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CGFloat width = 0;
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CGFloat height = 0;
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switch (self.imageSourceType) {
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case MPPImageSourceTypeSampleBuffer: {
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CVPixelBufferRef pixelBuffer = CMSampleBufferGetImageBuffer(self.sampleBuffer);
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width = CVPixelBufferGetWidth(pixelBuffer);
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height = CVPixelBufferGetHeight(pixelBuffer);
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break;
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}
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case MPPImageSourceTypePixelBuffer: {
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width = CVPixelBufferGetWidth(self.pixelBuffer);
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height = CVPixelBufferGetHeight(self.pixelBuffer);
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break;
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}
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case MPPImageSourceTypeImage: {
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width = self.image.bitmapSize.width;
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height = self.image.bitmapSize.height;
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break;
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}
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default:
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break;
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}
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return CGSizeMake(width, height);
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}
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@end
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