Multi frequency DTMF support - receiver side

webrtc/modules/audio_coding/neteq/dtmf_tone_generator.cc

 /*
  *  Copyright (c) 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 106 matching lines @@
     fs_index = 3;
   } else {
     assert(false);
     fs_index = 1;  // Default to 8000 Hz.
   }
 
   if (event < 0 || event > 15) {
     return kParameterError;  // Invalid event number.
   }
 
-  if (attenuation < 0 || attenuation > 36) {
+  if (attenuation < 0 || attenuation > 63) {
     return kParameterError;  // Invalid attenuation.
   }
 
   // Look up oscillator coefficient for low and high frequencies.
   coeff1_ = kCoeff1[fs_index][event];
   coeff2_ = kCoeff2[fs_index][event];
   // Look up amplitude multiplier.
   amplitude_ = kAmplitude[attenuation];
   // Initialize sample history.
   sample_history1_[0] = kInitValue1[fs_index][event];
@@ skipping 49 matching lines @@
   }
 
   return static_cast<int>(num_samples);
 }
 
 bool DtmfToneGenerator::initialized() const {
   return initialized_;
 }
 
 }  // namespace webrtc