NetEq: Add new method last_output_sample_rate_hz

webrtc/modules/audio_coding/main/acm2/audio_coding_module_impl.cc

Index: webrtc/modules/audio_coding/main/acm2/audio_coding_module_impl.cc
diff --git a/webrtc/modules/audio_coding/main/acm2/audio_coding_module_impl.cc b/webrtc/modules/audio_coding/main/acm2/audio_coding_module_impl.cc
index d4d5853e7181dceb5afc2c3e8475595177c67ad4..19ae4cbc2b5e6d18e9c22688d6c38dfb177045e5 100644
--- a/webrtc/modules/audio_coding/main/acm2/audio_coding_module_impl.cc
+++ b/webrtc/modules/audio_coding/main/acm2/audio_coding_module_impl.cc
@@ -532,17 +532,14 @@ int AudioCodingModuleImpl::ReceiveFrequency() const {
 
   auto codec_id = RentACodec::CodecIdFromIndex(receiver_.last_audio_codec_id());
   return codec_id ? RentACodec::CodecInstById(*codec_id)->plfreq
-                  : receiver_.current_sample_rate_hz();
+                  : receiver_.last_output_sample_rate_hz();
 }
 
 // Get current playout frequency.
 int AudioCodingModuleImpl::PlayoutFrequency() const {
   WEBRTC_TRACE(webrtc::kTraceStream, webrtc::kTraceAudioCoding, id_,
                "PlayoutFrequency()");
-
-  CriticalSectionScoped lock(acm_crit_sect_.get());
-
-  return receiver_.current_sample_rate_hz();
+  return receiver_.last_output_sample_rate_hz();
 }
 
 // Register possible receive codecs, can be called multiple times,