Change minimum DTMF event duration to be 40 milliseconds

webrtc/pc/dtmfsender.cc

 /*
  *  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.
  */
 
@@ skipping 21 matching lines @@
 //  | *     | 10     | tone | yes     |
 //  | #     | 11     | tone | yes     |
 //  | A--D  | 12--15 | tone | yes     |
 //  +-------+--------+------+---------+
 // The "," is a special event defined by the WebRTC spec. It means to delay for
 // 2 seconds before processing the next tone. We use -1 as its code.
 static const int kDtmfCodeTwoSecondDelay = -1;
 static const int kDtmfTwoSecondInMs = 2000;
 static const char kDtmfValidTones[] = ",0123456789*#ABCDabcd";
 static const char kDtmfTonesTable[] = ",0123456789*#ABCD";
-// The duration cannot be more than 6000ms or less than 70ms. The gap between
+// The duration cannot be more than 6000ms or less than 40ms. The gap between
 // tones must be at least 50 ms.
 static const int kDtmfDefaultDurationMs = 100;
-static const int kDtmfMinDurationMs = 70;
+static const int kDtmfMinDurationMs = 40;
 static const int kDtmfMaxDurationMs = 6000;
 static const int kDtmfDefaultGapMs = 50;
 static const int kDtmfMinGapMs = 50;
 
 // Get DTMF code from the DTMF event character.
 bool GetDtmfCode(char tone, int* code) {
   // Convert a-d to A-D.
   char event = toupper(tone);
   const char* p = strchr(kDtmfTonesTable, event);
   if (!p) {
@@ skipping 174 matching lines @@
   LOG(LS_INFO) << "The Dtmf provider is deleted. Clear the sending queue.";
   StopSending();
   provider_ = NULL;
 }
 
 void DtmfSender::StopSending() {
   signaling_thread_->Clear(this);
 }
 
 }  // namespace webrtc