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/*
* Copyright 2017 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>
#import "RTCMacros.h"
NS_ASSUME_NONNULL_BEGIN
RTC_OBJC_EXPORT
@protocol RTC_OBJC_TYPE
(RTCDtmfSender)<NSObject>
/**
* Returns true if this RTCDtmfSender is capable of sending DTMF. Otherwise
* returns false. To be able to send DTMF, the associated RTCRtpSender must be
* able to send packets, and a "telephone-event" codec must be negotiated.
*/
@property(nonatomic, readonly) BOOL canInsertDtmf;
/**
* Queues a task that sends the DTMF tones. The tones parameter is treated
* as a series of characters. The characters 0 through 9, A through D, #, and *
* generate the associated DTMF tones. The characters a to d are equivalent
* to A to D. The character ',' indicates a delay of 2 seconds before
* processing the next character in the tones parameter.
*
* Unrecognized characters are ignored.
*
* @param duration The parameter indicates the duration to use for each
* character passed in the tones parameter. The duration cannot be more
* than 6000 or less than 70 ms.
*
* @param interToneGap The parameter indicates the gap between tones.
* This parameter must be at least 50 ms but should be as short as
* possible.
*
* If InsertDtmf is called on the same object while an existing task for this
* object to generate DTMF is still running, the previous task is canceled.
* Returns true on success and false on failure.
*/
- (BOOL)insertDtmf:(nonnull NSString *)tones
duration:(NSTimeInterval)duration
interToneGap:(NSTimeInterval)interToneGap;
/** The tones remaining to be played out */
- (nonnull NSString *)remainingTones;
/**
* The current tone duration value. This value will be the value last set via the
* insertDtmf method, or the default value of 100 ms if insertDtmf was never called.
*/
- (NSTimeInterval)duration;
/**
* The current value of the between-tone gap. This value will be the value last set
* via the insertDtmf() method, or the default value of 50 ms if insertDtmf() was never
* called.
*/
- (NSTimeInterval)interToneGap;
@end
NS_ASSUME_NONNULL_END
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