Added MPPGesture Recognizer implementation
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Prianka Liz Kariat
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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/gesture_recognizer/sources/MPPGestureRecognizer.h"
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#import "mediapipe/tasks/ios/common/utils/sources/MPPCommonUtils.h"
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#import "mediapipe/tasks/ios/common/utils/sources/NSString+Helpers.h"
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#import "mediapipe/tasks/ios/core/sources/MPPTaskInfo.h"
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#import "mediapipe/tasks/ios/vision/core/sources/MPPVisionPacketCreator.h"
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#import "mediapipe/tasks/ios/vision/core/sources/MPPVisionTaskRunner.h"
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#import "mediapipe/tasks/ios/vision/gesture_recognizer/utils/sources/MPPGestureRecognizerOptions+Helpers.h"
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#import "mediapipe/tasks/ios/vision/gesture_recognizer/utils/sources/MPPGestureRecognizerResult+Helpers.h"
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namespace {
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using ::mediapipe::NormalizedRect;
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using ::mediapipe::Packet;
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using ::mediapipe::Timestamp;
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using ::mediapipe::tasks::core::PacketMap;
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using ::mediapipe::tasks::core::PacketsCallback;
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} // namespace
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static NSString *const kImageTag = @"IMAGE";
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static NSString *const kImageInStreamName = @"image_in";
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static NSString *const kNormRectTag = @"NORM_RECT";
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static NSString *const kNormRectInStreamName = @"norm_rect_in";
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static NSString *const kImageOutStreamName = @"image_out";
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static NSString *const kLandmarksTag = @"LANDMARKS";
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static NSString *const kLandmarksOutStreamName = @"hand_landmarks";
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static NSString *const kWorldLandmarksTag = @"WORLD_LANDMARKS";
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static NSString *const kWorldLandmarksOutStreamName = @"world_hand_landmarks";
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static NSString *const kHandednessTag = @"HANDEDNESS";
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static NSString *const kHandednessOutStreamName = @"handedness";
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static NSString *const kHandGesturesTag = @"HAND_GESTURES";
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static NSString *const kHandGesturesOutStreamName = @"hand_gestures";
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static NSString *const kTaskGraphName =
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@"mediapipe.tasks.vision.gesture_recognizer.GestureRecognizerGraph";
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static NSString *const kTaskName = @"gestureRecognizer";
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#define InputPacketMap(imagePacket, normalizedRectPacket) \
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{ \
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{kImageInStreamName.cppString, imagePacket}, { \
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kNormRectInStreamName.cppString, normalizedRectPacket \
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} \
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}
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@interface MPPGestureRecognizer () {
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/** iOS Vision Task Runner */
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MPPVisionTaskRunner *_visionTaskRunner;
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dispatch_queue_t _callbackQueue;
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}
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@property(nonatomic, weak) id<MPPGestureRecognizerLiveStreamDelegate>
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gestureRecognizerLiveStreamDelegate;
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@end
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@implementation MPPGestureRecognizer
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- (nullable MPPGestureRecognizerResult *)gestureRecognizerResultWithOutputPacketMap:
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(PacketMap &)outputPacketMap {
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return [MPPGestureRecognizerResult
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gestureRecognizerResultWithHandGesturesPacket:outputPacketMap[kHandGesturesOutStreamName
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.cppString]
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handednessPacket:outputPacketMap[kHandednessOutStreamName
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.cppString]
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handLandmarksPacket:outputPacketMap[kLandmarksOutStreamName
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.cppString]
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worldLandmarksPacket:outputPacketMap[kWorldLandmarksOutStreamName
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.cppString]];
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}
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- (void)processLiveStreamResult:(absl::StatusOr<PacketMap>)liveStreamResult {
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MPPGestureRecognizer *__weak weakSelf = self;
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if (![weakSelf.gestureRecognizerLiveStreamDelegate
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respondsToSelector:@selector(gestureRecognizer:
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didFinishRecognitionWithResult:timestampInMilliseconds:error:)]) {
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return;
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}
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NSError *callbackError = nil;
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if (![MPPCommonUtils checkCppError:liveStreamResult.status() toError:&callbackError]) {
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dispatch_async(_callbackQueue, ^{
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[weakSelf.gestureRecognizerLiveStreamDelegate gestureRecognizer:weakSelf
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didFinishRecognitionWithResult:nil
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timestampInMilliseconds:Timestamp::Unset().Value()
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error:callbackError];
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});
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return;
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}
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PacketMap &outputPacketMap = liveStreamResult.value();
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if (outputPacketMap[kImageOutStreamName.cppString].IsEmpty()) {
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return;
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}
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MPPGestureRecognizerResult *result =
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[weakSelf gestureRecognizerResultWithOutputPacketMap:outputPacketMap];
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NSInteger timeStampInMilliseconds =
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outputPacketMap[kImageOutStreamName.cppString].Timestamp().Value() /
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kMicroSecondsPerMilliSecond;
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dispatch_async(_callbackQueue, ^{
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[weakSelf.gestureRecognizerLiveStreamDelegate gestureRecognizer:weakSelf
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didFinishRecognitionWithResult:result
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timestampInMilliseconds:timeStampInMilliseconds
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error:callbackError];
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});
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}
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- (instancetype)initWithOptions:(MPPGestureRecognizerOptions *)options error:(NSError **)error {
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self = [super init];
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if (self) {
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MPPTaskInfo *taskInfo = [[MPPTaskInfo alloc]
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initWithTaskGraphName:kTaskGraphName
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inputStreams:@[
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[NSString stringWithFormat:@"%@:%@", kImageTag, kImageInStreamName],
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[NSString stringWithFormat:@"%@:%@", kNormRectTag, kNormRectInStreamName]
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]
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outputStreams:@[
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[NSString stringWithFormat:@"%@:%@", kLandmarksTag, kLandmarksOutStreamName],
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[NSString
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stringWithFormat:@"%@:%@", kWorldLandmarksTag, kWorldLandmarksOutStreamName],
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[NSString stringWithFormat:@"%@:%@", kHandednessTag, kHandednessOutStreamName],
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[NSString
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stringWithFormat:@"%@:%@", kHandGesturesTag, kHandGesturesOutStreamName],
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[NSString stringWithFormat:@"%@:%@", kImageTag, kImageOutStreamName]
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]
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taskOptions:options
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enableFlowLimiting:options.runningMode == MPPRunningModeLiveStream
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error:error];
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if (!taskInfo) {
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return nil;
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}
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PacketsCallback packetsCallback = nullptr;
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if (options.gestureRecognizerLiveStreamDelegate) {
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_gestureRecognizerLiveStreamDelegate = options.gestureRecognizerLiveStreamDelegate;
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// Capturing `self` as weak in order to avoid `self` being kept in memory
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// and cause a retain cycle, after self is set to `nil`.
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MPPGestureRecognizer *__weak weakSelf = self;
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// Create a private serial dispatch queue in which the deleagte method will be called
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// asynchronously. This is to ensure that if the client performs a long running operation in
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// the delegate method, the queue on which the C++ callbacks is invoked is not blocked and is
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// freed up to continue with its operations.
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const char *queueName = [MPPVisionTaskRunner uniqueDispatchQueueNameWithSuffix:kTaskName];
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_callbackQueue = dispatch_queue_create(queueName, NULL);
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packetsCallback = [=](absl::StatusOr<PacketMap> liveStreamResult) {
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[weakSelf processLiveStreamResult:liveStreamResult];
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};
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}
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_visionTaskRunner =
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[[MPPVisionTaskRunner alloc] initWithCalculatorGraphConfig:[taskInfo generateGraphConfig]
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runningMode:options.runningMode
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packetsCallback:std::move(packetsCallback)
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error:error];
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if (!_visionTaskRunner) {
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return nil;
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}
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}
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return self;
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}
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- (instancetype)initWithModelPath:(NSString *)modelPath error:(NSError **)error {
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MPPGestureRecognizerOptions *options = [[MPPGestureRecognizerOptions alloc] init];
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options.baseOptions.modelAssetPath = modelPath;
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return [self initWithOptions:options error:error];
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}
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- (nullable MPPGestureRecognizerResult *)gestureRecognizerResultWithOptionalOutputPacketMap:
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(std::optional<PacketMap> &)outputPacketMap {
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if (!outputPacketMap.has_value()) {
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return nil;
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}
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MPPGestureRecognizerResult *result =
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[self gestureRecognizerResultWithOutputPacketMap:outputPacketMap.value()];
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return result;
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}
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- (nullable MPPGestureRecognizerResult *)recognizeImage:(MPPImage *)image error:(NSError **)error {
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std::optional<NormalizedRect> rect =
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[_visionTaskRunner normalizedRectWithImageOrientation:image.orientation
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imageSize:CGSizeMake(image.width, image.height)
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error:error];
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if (!rect.has_value()) {
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return nil;
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}
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Packet imagePacket = [MPPVisionPacketCreator createPacketWithMPPImage:image error:error];
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if (imagePacket.IsEmpty()) {
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return nil;
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}
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Packet normalizedRectPacket =
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[MPPVisionPacketCreator createPacketWithNormalizedRect:rect.value()];
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PacketMap inputPacketMap = InputPacketMap(imagePacket, normalizedRectPacket);
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std::optional<PacketMap> outputPacketMap = [_visionTaskRunner processImagePacketMap:inputPacketMap
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error:error];
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return [self gestureRecognizerResultWithOptionalOutputPacketMap:outputPacketMap];
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}
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- (std::optional<PacketMap>)inputPacketMapWithMPPImage:(MPPImage *)image
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timestampInMilliseconds:(NSInteger)timestampInMilliseconds
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error:(NSError **)error {
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std::optional<NormalizedRect> rect =
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[_visionTaskRunner normalizedRectWithImageOrientation:image.orientation
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imageSize:CGSizeMake(image.width, image.height)
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error:error];
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if (!rect.has_value()) {
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return std::nullopt;
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}
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Packet imagePacket = [MPPVisionPacketCreator createPacketWithMPPImage:image
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timestampInMilliseconds:timestampInMilliseconds
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error:error];
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if (imagePacket.IsEmpty()) {
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return std::nullopt;
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}
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Packet normalizedRectPacket =
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[MPPVisionPacketCreator createPacketWithNormalizedRect:rect.value()
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timestampInMilliseconds:timestampInMilliseconds];
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PacketMap inputPacketMap = InputPacketMap(imagePacket, normalizedRectPacket);
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return inputPacketMap;
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}
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- (nullable MPPGestureRecognizerResult *)recognizeVideoFrame:(MPPImage *)image
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timestampInMilliseconds:(NSInteger)timestampInMilliseconds
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error:(NSError **)error {
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std::optional<PacketMap> inputPacketMap = [self inputPacketMapWithMPPImage:image
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timestampInMilliseconds:timestampInMilliseconds
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error:error];
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if (!inputPacketMap.has_value()) {
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return nil;
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}
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std::optional<PacketMap> outputPacketMap =
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[_visionTaskRunner processVideoFramePacketMap:inputPacketMap.value() error:error];
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return [self gestureRecognizerResultWithOptionalOutputPacketMap:outputPacketMap];
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}
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- (BOOL)recognizeAsyncImage:(MPPImage *)image
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timestampInMilliseconds:(NSInteger)timestampInMilliseconds
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error:(NSError **)error {
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std::optional<PacketMap> inputPacketMap = [self inputPacketMapWithMPPImage:image
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timestampInMilliseconds:timestampInMilliseconds
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error:error];
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if (!inputPacketMap.has_value()) {
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return NO;
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}
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return [_visionTaskRunner processLiveStreamPacketMap:inputPacketMap.value() error:error];
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}
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@end
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