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/*
* Copyright 2012 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.
*/
#ifndef PC_DTMF_SENDER_H_
#define PC_DTMF_SENDER_H_
#include <stdint.h>
#include <string>
#include "api/dtmf_sender_interface.h"
#include "api/proxy.h"
#include "api/scoped_refptr.h"
#include "rtc_base/constructor_magic.h"
#include "rtc_base/location.h"
#include "rtc_base/ref_count.h"
#include "rtc_base/task_utils/pending_task_safety_flag.h"
#include "rtc_base/third_party/sigslot/sigslot.h"
#include "rtc_base/thread.h"
// DtmfSender is the native implementation of the RTCDTMFSender defined by
// the WebRTC W3C Editor's Draft.
// https://w3c.github.io/webrtc-pc/#rtcdtmfsender
namespace webrtc {
// This interface is called by DtmfSender to talk to the actual audio channel
// to send DTMF.
class DtmfProviderInterface {
public:
// Returns true if the audio sender is capable of sending DTMF. Otherwise
// returns false.
virtual bool CanInsertDtmf() = 0;
// Sends DTMF |code|.
// The |duration| indicates the length of the DTMF tone in ms.
// Returns true on success and false on failure.
virtual bool InsertDtmf(int code, int duration) = 0;
// Returns a |sigslot::signal0<>| signal. The signal should fire before
// the provider is destroyed.
virtual sigslot::signal0<>* GetOnDestroyedSignal() = 0;
protected:
virtual ~DtmfProviderInterface() {}
};
class DtmfSender : public DtmfSenderInterface, public sigslot::has_slots<> {
public:
static rtc::scoped_refptr<DtmfSender> Create(rtc::Thread* signaling_thread,
DtmfProviderInterface* provider);
// Implements DtmfSenderInterface.
void RegisterObserver(DtmfSenderObserverInterface* observer) override;
void UnregisterObserver() override;
bool CanInsertDtmf() override;
bool InsertDtmf(const std::string& tones,
int duration,
int inter_tone_gap,
int comma_delay = kDtmfDefaultCommaDelayMs) override;
std::string tones() const override;
int duration() const override;
int inter_tone_gap() const override;
int comma_delay() const override;
protected:
DtmfSender(rtc::Thread* signaling_thread, DtmfProviderInterface* provider);
virtual ~DtmfSender();
private:
DtmfSender();
void QueueInsertDtmf(const rtc::Location& posted_from, uint32_t delay_ms)
RTC_RUN_ON(signaling_thread_);
// The DTMF sending task.
void DoInsertDtmf() RTC_RUN_ON(signaling_thread_);
void OnProviderDestroyed();
void StopSending() RTC_RUN_ON(signaling_thread_);
DtmfSenderObserverInterface* observer_ RTC_GUARDED_BY(signaling_thread_);
rtc::Thread* signaling_thread_;
DtmfProviderInterface* provider_ RTC_GUARDED_BY(signaling_thread_);
std::string tones_ RTC_GUARDED_BY(signaling_thread_);
int duration_ RTC_GUARDED_BY(signaling_thread_);
int inter_tone_gap_ RTC_GUARDED_BY(signaling_thread_);
int comma_delay_ RTC_GUARDED_BY(signaling_thread_);
// For cancelling the tasks which feed the DTMF provider one tone at a time.
rtc::scoped_refptr<PendingTaskSafetyFlag> safety_flag_ RTC_GUARDED_BY(
signaling_thread_) RTC_PT_GUARDED_BY(signaling_thread_) = nullptr;
RTC_DISALLOW_COPY_AND_ASSIGN(DtmfSender);
};
// Define proxy for DtmfSenderInterface.
BEGIN_PRIMARY_PROXY_MAP(DtmfSender)
PROXY_PRIMARY_THREAD_DESTRUCTOR()
PROXY_METHOD1(void, RegisterObserver, DtmfSenderObserverInterface*)
PROXY_METHOD0(void, UnregisterObserver)
PROXY_METHOD0(bool, CanInsertDtmf)
PROXY_METHOD4(bool, InsertDtmf, const std::string&, int, int, int)
PROXY_CONSTMETHOD0(std::string, tones)
PROXY_CONSTMETHOD0(int, duration)
PROXY_CONSTMETHOD0(int, inter_tone_gap)
PROXY_CONSTMETHOD0(int, comma_delay)
END_PROXY_MAP()
// Get DTMF code from the DTMF event character.
bool GetDtmfCode(char tone, int* code);
} // namespace webrtc
#endif // PC_DTMF_SENDER_H_
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