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PiperOrigin-RevId: 263889205

mediapipe/objc/MPPInputSource.m

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+// Copyright 2019 The MediaPipe Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#import "MPPInputSource.h"
+
+#define ABSTRACT_METHOD \
+    @throw [NSException exceptionWithName:NSInternalInconsistencyException \
+        reason:[NSString stringWithFormat:@"You must override %@ in a subclass", \
+                    NSStringFromSelector(_cmd)] \
+        userInfo:nil];
+
+@implementation MPPInputSource
+
+- (void)setDelegate:(id<MPPInputSourceDelegate>)delegate
+              queue:(dispatch_queue_t)queue {
+  _delegate = delegate;
+  _delegateQueue = queue;
+}
+
+- (void)start {
+  ABSTRACT_METHOD
+}
+
+- (void)stop {
+  ABSTRACT_METHOD
+}
+
+@end