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/*
* Copyright (C) 2013 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY GOOGLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GOOGLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "third_party/blink/renderer/modules/peerconnection/rtc_dtmf_sender.h"
#include <memory>
#include "base/compiler_specific.h"
#include "third_party/blink/public/platform/task_type.h"
#include "third_party/blink/renderer/core/execution_context/execution_context.h"
#include "third_party/blink/renderer/modules/mediastream/media_stream_track.h"
#include "third_party/blink/renderer/modules/peerconnection/rtc_dtmf_tone_change_event.h"
#include "third_party/blink/renderer/modules/peerconnection/rtc_peer_connection_handler.h"
#include "third_party/blink/renderer/platform/bindings/exception_state.h"
#include "third_party/blink/renderer/platform/peerconnection/rtc_dtmf_sender_handler.h"
#include "third_party/blink/renderer/platform/wtf/functional.h"
namespace blink {
static const int kMinToneDurationMs = 40;
static const int kDefaultToneDurationMs = 100;
static const int kMaxToneDurationMs = 6000;
static const int kMinInterToneGapMs = 30;
static const int kMaxInterToneGapMs = 6000;
static const int kDefaultInterToneGapMs = 70;
RTCDTMFSender* RTCDTMFSender::Create(
ExecutionContext* context,
std::unique_ptr<RtcDtmfSenderHandler> dtmf_sender_handler) {
DCHECK(dtmf_sender_handler);
return MakeGarbageCollected<RTCDTMFSender>(context,
std::move(dtmf_sender_handler));
}
RTCDTMFSender::RTCDTMFSender(ExecutionContext* context,
std::unique_ptr<RtcDtmfSenderHandler> handler)
: ExecutionContextLifecycleObserver(context),
handler_(std::move(handler)),
stopped_(false) {
handler_->SetClient(this);
}
RTCDTMFSender::~RTCDTMFSender() = default;
void RTCDTMFSender::Dispose() {
// Promptly clears a raw reference from content/ to an on-heap object
// so that content/ doesn't access it in a lazy sweeping phase.
handler_->SetClient(nullptr);
handler_.reset();
}
bool RTCDTMFSender::canInsertDTMF() const {
return handler_->CanInsertDTMF();
}
String RTCDTMFSender::toneBuffer() const {
return tone_buffer_;
}
void RTCDTMFSender::insertDTMF(const String& tones,
ExceptionState& exception_state) {
insertDTMF(tones, kDefaultToneDurationMs, kDefaultInterToneGapMs,
exception_state);
}
void RTCDTMFSender::insertDTMF(const String& tones,
int duration,
ExceptionState& exception_state) {
insertDTMF(tones, duration, kDefaultInterToneGapMs, exception_state);
}
void RTCDTMFSender::insertDTMF(const String& tones,
int duration,
int inter_tone_gap,
ExceptionState& exception_state) {
// https://w3c.github.io/webrtc-pc/#dom-rtcdtmfsender-insertdtmf
if (!canInsertDTMF()) {
exception_state.ThrowDOMException(DOMExceptionCode::kInvalidStateError,
"The 'canInsertDTMF' attribute is false: "
"this sender cannot send DTMF.");
return;
}
// Spec: Throw on illegal characters
if (UNSAFE_TODO(strspn(tones.Ascii().c_str(), "0123456789abcdABCD#*,")) !=
tones.length()) {
exception_state.ThrowDOMException(
DOMExceptionCode::kInvalidCharacterError,
"Illegal characters in InsertDTMF tone argument");
return;
}
// Spec: Clamp the duration to between 40 and 6000 ms
duration_ = std::max(duration, kMinToneDurationMs);
duration_ = std::min(duration_, kMaxToneDurationMs);
// Spec: Clamp the inter-tone gap to between 30 and 6000 ms
inter_tone_gap_ = std::max(inter_tone_gap, kMinInterToneGapMs);
inter_tone_gap_ = std::min(inter_tone_gap_, kMaxInterToneGapMs);
// Spec: a-d should be represented in the tone buffer as A-D
tone_buffer_ = tones.UpperASCII();
if (tone_buffer_.empty()) {
return;
}
if (!playout_task_is_scheduled_) {
playout_task_is_scheduled_ = true;
GetExecutionContext()
->GetTaskRunner(TaskType::kNetworking)
->PostTask(FROM_HERE, WTF::BindOnce(&RTCDTMFSender::PlayoutTask,
WrapPersistent(this)));
}
}
void RTCDTMFSender::PlayoutTask() {
playout_task_is_scheduled_ = false;
// TODO(crbug.com/891638): Add check on transceiver's "stopped"
// and "currentDirection" attributes as per spec.
if (tone_buffer_.empty()) {
Member<Event> event = MakeGarbageCollected<RTCDTMFToneChangeEvent>("");
DispatchEvent(*event.Release());
return;
}
String this_tone = tone_buffer_.Substring(0, 1);
tone_buffer_ = tone_buffer_.Substring(1, tone_buffer_.length() - 1);
// InsertDTMF handles both tones and ",", and calls DidPlayTone after
// the specified delay.
if (!handler_->InsertDTMF(this_tone, duration_, inter_tone_gap_)) {
LOG(ERROR) << "DTMF: Could not send provided tone, '" << this_tone.Ascii()
<< "'.";
return;
}
playout_task_is_scheduled_ = true;
Member<Event> event = MakeGarbageCollected<RTCDTMFToneChangeEvent>(this_tone);
DispatchEvent(*event.Release());
}
void RTCDTMFSender::DidPlayTone(const String& tone) {
// We're using the DidPlayTone with an empty buffer to signal the
// end of the tone.
if (tone.empty()) {
GetExecutionContext()
->GetTaskRunner(TaskType::kNetworking)
->PostDelayedTask(
FROM_HERE,
WTF::BindOnce(&RTCDTMFSender::PlayoutTask, WrapPersistent(this)),
base::Milliseconds(inter_tone_gap_));
}
}
const AtomicString& RTCDTMFSender::InterfaceName() const {
return event_target_names::kRTCDTMFSender;
}
ExecutionContext* RTCDTMFSender::GetExecutionContext() const {
return ExecutionContextLifecycleObserver::GetExecutionContext();
}
void RTCDTMFSender::ContextDestroyed() {
stopped_ = true;
handler_->SetClient(nullptr);
}
void RTCDTMFSender::Trace(Visitor* visitor) const {
EventTarget::Trace(visitor);
RtcDtmfSenderHandler::Client::Trace(visitor);
ExecutionContextLifecycleObserver::Trace(visitor);
}
} // namespace blink
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