Using ring buffer for AudioVector in NetEq.

webrtc/modules/audio_coding/neteq/comfort_noise.cc

Index: webrtc/modules/audio_coding/neteq/comfort_noise.cc
diff --git a/webrtc/modules/audio_coding/neteq/comfort_noise.cc b/webrtc/modules/audio_coding/neteq/comfort_noise.cc
index 2a512bd750f258491f3fac1a77f25ae356da59b1..c6b6517085ac0672b605b3b94ce73fd36d5afdf0 100644
--- a/webrtc/modules/audio_coding/neteq/comfort_noise.cc
+++ b/webrtc/modules/audio_coding/neteq/comfort_noise.cc
@@ -69,8 +69,9 @@ int ComfortNoise::Generate(size_t requested_length,
   }
   // 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);
@@ -78,6 +79,7 @@ int ComfortNoise::Generate(size_t requested_length,
         "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.