115 lines
3.5 KiB
C
115 lines
3.5 KiB
C
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/*
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* Copyright 2012 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef PC_DTMF_SENDER_H_
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#define PC_DTMF_SENDER_H_
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#include <string>
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#include "api/dtmf_sender_interface.h"
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#include "api/proxy.h"
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#include "rtc_base/async_invoker.h"
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#include "rtc_base/constructor_magic.h"
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#include "rtc_base/ref_count.h"
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#include "rtc_base/thread.h"
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// DtmfSender is the native implementation of the RTCDTMFSender defined by
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// the WebRTC W3C Editor's Draft.
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// https://w3c.github.io/webrtc-pc/#rtcdtmfsender
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namespace webrtc {
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// This interface is called by DtmfSender to talk to the actual audio channel
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// to send DTMF.
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class DtmfProviderInterface {
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public:
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// Returns true if the audio sender is capable of sending DTMF. Otherwise
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// returns false.
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virtual bool CanInsertDtmf() = 0;
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// Sends DTMF |code|.
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// The |duration| indicates the length of the DTMF tone in ms.
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// Returns true on success and false on failure.
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virtual bool InsertDtmf(int code, int duration) = 0;
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// Returns a |sigslot::signal0<>| signal. The signal should fire before
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// the provider is destroyed.
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virtual sigslot::signal0<>* GetOnDestroyedSignal() = 0;
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protected:
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virtual ~DtmfProviderInterface() {}
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};
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class DtmfSender : public DtmfSenderInterface, public sigslot::has_slots<> {
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public:
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static rtc::scoped_refptr<DtmfSender> Create(rtc::Thread* signaling_thread,
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DtmfProviderInterface* provider);
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// Implements DtmfSenderInterface.
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void RegisterObserver(DtmfSenderObserverInterface* observer) override;
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void UnregisterObserver() override;
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bool CanInsertDtmf() override;
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bool InsertDtmf(const std::string& tones,
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int duration,
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int inter_tone_gap,
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int comma_delay = kDtmfDefaultCommaDelayMs) override;
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std::string tones() const override;
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int duration() const override;
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int inter_tone_gap() const override;
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int comma_delay() const override;
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protected:
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DtmfSender(rtc::Thread* signaling_thread, DtmfProviderInterface* provider);
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virtual ~DtmfSender();
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private:
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DtmfSender();
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void QueueInsertDtmf(const rtc::Location& posted_from, uint32_t delay_ms);
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// The DTMF sending task.
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void DoInsertDtmf();
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void OnProviderDestroyed();
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void StopSending();
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DtmfSenderObserverInterface* observer_;
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rtc::Thread* signaling_thread_;
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DtmfProviderInterface* provider_;
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std::string tones_;
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int duration_;
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int inter_tone_gap_;
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int comma_delay_;
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// Invoker for running delayed tasks which feed the DTMF provider one tone at
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// a time.
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rtc::AsyncInvoker dtmf_driver_;
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RTC_DISALLOW_COPY_AND_ASSIGN(DtmfSender);
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};
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// Define proxy for DtmfSenderInterface.
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BEGIN_SIGNALING_PROXY_MAP(DtmfSender)
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PROXY_SIGNALING_THREAD_DESTRUCTOR()
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PROXY_METHOD1(void, RegisterObserver, DtmfSenderObserverInterface*)
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PROXY_METHOD0(void, UnregisterObserver)
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PROXY_METHOD0(bool, CanInsertDtmf)
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PROXY_METHOD4(bool, InsertDtmf, const std::string&, int, int, int)
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PROXY_CONSTMETHOD0(std::string, tones)
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PROXY_CONSTMETHOD0(int, duration)
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PROXY_CONSTMETHOD0(int, inter_tone_gap)
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PROXY_CONSTMETHOD0(int, comma_delay)
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END_PROXY_MAP()
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// Get DTMF code from the DTMF event character.
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bool GetDtmfCode(char tone, int* code);
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} // namespace webrtc
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#endif // PC_DTMF_SENDER_H_
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