Add new method AcmReceiver::last_packet_sample_rate_hz()

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

 /*
  *  Copyright (c) 2013 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 312 matching lines @@
   // Start with sending DTX.
   ASSERT_EQ(0, acm_->SetVAD(true, true, VADVeryAggr));
   packet_sent_ = false;
   InsertOnePacketOfSilence(CodecIdInst(kCodecId[0]).id);  // Enough to test
                                                           // with one codec.
   ASSERT_TRUE(packet_sent_);
   EXPECT_EQ(kAudioFrameCN, last_frame_type_);
 
   // Has received, only, DTX. Last Audio codec is undefined.
   EXPECT_EQ(-1, receiver_->LastAudioCodec(&codec));
-  EXPECT_EQ(-1, receiver_->last_audio_codec_id());
+  EXPECT_FALSE(receiver_->last_packet_sample_rate_hz());
 
   for (auto id : kCodecId) {
     const CodecIdInst c(id);
 
     // Set DTX off to send audio payload.
     acm_->SetVAD(false, false, VADAggr);
     packet_sent_ = false;
     InsertOnePacketOfSilence(c.id);
 
     // Sanity check if Actually an audio payload received, and it should be
     // of type "speech."
     ASSERT_TRUE(packet_sent_);
     ASSERT_EQ(kAudioFrameSpeech, last_frame_type_);
-    EXPECT_EQ(c.id, receiver_->last_audio_codec_id());
+    EXPECT_EQ(rtc::Optional<int>(c.inst.plfreq),
+              receiver_->last_packet_sample_rate_hz());
 
     // Set VAD on to send DTX. Then check if the "Last Audio codec" returns
     // the expected codec.
     acm_->SetVAD(true, true, VADAggr);
 
     // Do as many encoding until a DTX is sent.
     while (last_frame_type_ != kAudioFrameCN) {
       packet_sent_ = false;
       InsertOnePacketOfSilence(c.id);
       ASSERT_TRUE(packet_sent_);
     }
-    EXPECT_EQ(c.id, receiver_->last_audio_codec_id());
+    EXPECT_EQ(rtc::Optional<int>(c.inst.plfreq),
+              receiver_->last_packet_sample_rate_hz());
     EXPECT_EQ(0, receiver_->LastAudioCodec(&codec));
     EXPECT_TRUE(CodecsEqual(c.inst, codec));
   }
 }
 
 }  // namespace acm2
 
 }  // namespace webrtc