Using ring buffer for AudioVector in NetEq.

webrtc/modules/audio_coding/neteq/comfort_noise.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 49 matching lines @@
     number_of_samples = requested_length + overlap_length_;
     new_period = true;
   }
   output->AssertSize(number_of_samples);
   // Get the decoder from the database.
   ComfortNoiseDecoder* cng_decoder = decoder_database_->GetActiveCngDecoder();
   if (!cng_decoder) {
     LOG(LS_ERROR) << "Unknwown payload type";
     return kUnknownPayloadType;
   }
-  // The expression &(*output)[0][0] is a pointer to the first element in
-  // the first channel.
+
+  std::unique_ptr<int16_t[]> temp(new int16_t[number_of_samples]);
   if (!cng_decoder->Generate(
-          rtc::ArrayView<int16_t>(&(*output)[0][0], number_of_samples),
+          rtc::ArrayView<int16_t>(temp.get(), number_of_samples),
           new_period)) {
     // Error returned.
     output->Zeros(requested_length);
     LOG(LS_ERROR) <<
         "ComfortNoiseDecoder::Genererate failed to generate comfort noise";
     return kInternalError;
   }
+  (*output)[0].OverwriteAt(temp.get(), number_of_samples, 0);
 
   if (first_call_) {
     // Set tapering window parameters. Values are in Q15.
     int16_t muting_window;  // Mixing factor for overlap data.
     int16_t muting_window_increment;  // Mixing factor increment (negative).
     int16_t unmuting_window;  // Mixing factor for comfort noise.
     int16_t unmuting_window_increment;  // Mixing factor increment.
     if (fs_hz_ == 8000) {
       muting_window = DspHelper::kMuteFactorStart8kHz;
       muting_window_increment = DspHelper::kMuteFactorIncrement8kHz;
@@ skipping 30 matching lines @@
     }
     // Remove |overlap_length_| samples from the front of |output| since they
     // were mixed into |sync_buffer_| above.
     output->PopFront(overlap_length_);
   }
   first_call_ = false;
   return kOK;
 }
 
 }  // namespace webrtc