Rename media constraints model and store.
ARDMediaConstraintsModel -> ARDSettingsModel
ARDMediaConstraintsSettingsStore -> ARDSettingsStore
ARDMediaConstraintsModelTests -> ARDSettingsModelTests
Both classes will be used to storing other settings as well, so we need a
more appropriate naming.
BUG=webrtc:6654
Review-Url: https://codereview.webrtc.org/2479153002
Cr-Commit-Position: refs/heads/master@{#15002}
diff --git a/webrtc/examples/objc/AppRTCMobile/ios/ARDSettingsModel.h b/webrtc/examples/objc/AppRTCMobile/ios/ARDSettingsModel.h
new file mode 100644
index 0000000..9c8b5c5
--- /dev/null
+++ b/webrtc/examples/objc/AppRTCMobile/ios/ARDSettingsModel.h
@@ -0,0 +1,59 @@
+/*
+ * Copyright 2016 The WebRTC Project Authors. All rights reserved.
+ *
+ * Use of this source code is governed by a BSD-style license
+ * that can be found in the LICENSE file in the root of the source
+ * tree. An additional intellectual property rights grant can be found
+ * in the file PATENTS. All contributing project authors may
+ * be found in the AUTHORS file in the root of the source tree.
+ */
+
+#import <Foundation/Foundation.h>
+
+NS_ASSUME_NONNULL_BEGIN
+/**
+ * Model class for user defined settings.
+ *
+ * Currently used for streaming media constraints and bitrate only.
+ * In future audio media constraints support can be added as well.
+ * Offers list of avaliable video resolutions that can construct streaming media constraint.
+ * Exposes methods for reading and storing media constraints from persistent store.
+ * Also translates current user defined media constraint into RTCMediaConstraints
+ * dictionary.
+ */
+@interface ARDSettingsModel : NSObject
+
+/**
+ * Returns array of available capture resoultions.
+ *
+ * The capture resolutions are represented as strings in the following format
+ * [width]x[height]
+ */
+- (NSArray<NSString *> *)availableVideoResoultionsMediaConstraints;
+
+/**
+ * Returns current video resolution media constraint string.
+ * If no constraint is in store, default value of 640x480 is returned.
+ * When defaulting to value, the default is saved in store for consistency reasons.
+ */
+- (NSString *)currentVideoResoultionConstraintFromStore;
+
+/**
+ * Stores the provided video resolution media constraint string into the store.
+ *
+ * If the provided constraint is no part of the available video resolutions
+ * the store operation will not be executed and NO will be returned.
+ * @param constraint the string to be stored.
+ * @return YES/NO depending on success.
+ */
+- (BOOL)storeVideoResoultionConstraint:(NSString *)constraint;
+
+/**
+ * Converts the current media constraints from store into dictionary with RTCMediaConstraints
+ * values.
+ *
+ * @return NSDictionary with RTC width and height parameters
+ */
+- (nullable NSDictionary *)currentMediaConstraintFromStoreAsRTCDictionary;
+@end
+NS_ASSUME_NONNULL_END