/*
 *  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 <AVFoundation/AVFoundation.h>
#import <Foundation/Foundation.h>

NS_ASSUME_NONNULL_BEGIN

extern const int kRTCAudioSessionPreferredNumberOfChannels;
extern const double kRTCAudioSessionHighPerformanceSampleRate;
extern const double kRTCAudioSessionLowComplexitySampleRate;
extern const double kRTCAudioSessionHighPerformanceIOBufferDuration;
extern const double kRTCAudioSessionLowComplexityIOBufferDuration;

// Struct to hold configuration values.
@interface RTCAudioSessionConfiguration : NSObject

@property(nonatomic, strong) NSString *category;
@property(nonatomic, assign) AVAudioSessionCategoryOptions categoryOptions;
@property(nonatomic, strong) NSString *mode;
@property(nonatomic, assign) double sampleRate;
@property(nonatomic, assign) NSTimeInterval ioBufferDuration;
@property(nonatomic, assign) NSInteger inputNumberOfChannels;
@property(nonatomic, assign) NSInteger outputNumberOfChannels;

/** Initializes configuration to defaults. */
- (instancetype)init NS_DESIGNATED_INITIALIZER;

/** Returns the current configuration of the audio session. */
+ (instancetype)currentConfiguration;
/** Returns the configuration that WebRTC needs. */
+ (instancetype)webRTCConfiguration;
/** Provide a way to override the default configuration. */
+ (void)setWebRTCConfiguration:(RTCAudioSessionConfiguration *)configuration;

@end

NS_ASSUME_NONNULL_END