Let AudioCodingModule::SendCodec return Maybe<CodecInst>

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

 /*
  *  Copyright (c) 2015 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 319 matching lines @@
     dtx_enabled_ = false;
   codec_fec_enabled_ =
       codec_fec_enabled_ && codec_owner_.Encoder()->SetFec(codec_fec_enabled_);
   int cng_pt = dtx_enabled_
                    ? CngPayloadType(external_speech_encoder->SampleRateHz())
                    : -1;
   int red_pt = red_enabled_ ? RedPayloadType(send_codec_inst_.plfreq) : -1;
   codec_owner_.SetEncoders(external_speech_encoder, cng_pt, vad_mode_, red_pt);
 }
 
-int CodecManager::GetCodecInst(CodecInst* current_codec) const {
+rtc::Maybe<CodecInst> CodecManager::GetCodecInst() const {
   int dummy_id = 0;
   WEBRTC_TRACE(webrtc::kTraceStream, webrtc::kTraceAudioCoding, dummy_id,
                "SendCodec()");
 
   if (!codec_owner_.Encoder()) {
     WEBRTC_TRACE(webrtc::kTraceStream, webrtc::kTraceAudioCoding, dummy_id,
                  "SendCodec Failed, no codec is registered");
-    return -1;
+    return rtc::Maybe<CodecInst>();
   }
-  *current_codec = send_codec_inst_;
-  return 0;
+  return rtc::Maybe<CodecInst>(send_codec_inst_);
 }
 
 bool CodecManager::SetCopyRed(bool enable) {
   if (enable && codec_fec_enabled_) {
     WEBRTC_TRACE(webrtc::kTraceWarning, webrtc::kTraceAudioCoding, 0,
                  "Codec internal FEC and RED cannot be co-enabled.");
     return false;
   }
   if (enable && RedPayloadType(send_codec_inst_.plfreq) == -1) {
     WEBRTC_TRACE(webrtc::kTraceWarning, webrtc::kTraceAudioCoding, 0,
@@ skipping 94 matching lines @@
     case 48000:
       return -1;
     default:
       FATAL() << sample_rate_hz << " Hz is not supported";
       return -1;
   }
 }
 
 }  // namespace acm2
 }  // namespace webrtc