Make an enum class out of NetEqDecoder, and hide the neteq_decoders_ table

webrtc/modules/audio_coding/neteq/timestamp_scaler.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 26 matching lines @@
 
 uint32_t TimestampScaler::ToInternal(uint32_t external_timestamp,
                                      uint8_t rtp_payload_type) {
   const DecoderDatabase::DecoderInfo* info =
       decoder_database_.GetDecoderInfo(rtp_payload_type);
   if (!info) {
     // Payload type is unknown. Do not scale.
     return external_timestamp;
   }
   switch (info->codec_type) {
-    case kDecoderG722:
-    case kDecoderG722_2ch: {
+    case NetEqDecoder::kDecoderG722:
+    case NetEqDecoder::kDecoderG722_2ch: {
       // Use timestamp scaling with factor 2 (two output samples per RTP
       // timestamp).
       numerator_ = 2;
       denominator_ = 1;
       break;
     }
-    case kDecoderCNGswb48kHz: {
+    case NetEqDecoder::kDecoderCNGswb48kHz: {
       // Use timestamp scaling with factor 2/3 (32 kHz sample rate, but RTP
       // timestamps run on 48 kHz).
       // TODO(tlegrand): Remove scaling for kDecoderCNGswb48kHz once ACM has
       // full 48 kHz support.
       numerator_ = 2;
       denominator_ = 3;
       break;
     }
-    case kDecoderAVT:
-    case kDecoderCNGnb:
-    case kDecoderCNGwb:
-    case kDecoderCNGswb32kHz: {
+    case NetEqDecoder::kDecoderAVT:
+    case NetEqDecoder::kDecoderCNGnb:
+    case NetEqDecoder::kDecoderCNGwb:
+    case NetEqDecoder::kDecoderCNGswb32kHz: {
       // Do not change the timestamp scaling settings for DTMF or CNG.
       break;
     }
     default: {
       // Do not use timestamp scaling for any other codec.
       numerator_ = 1;
       denominator_ = 1;
       break;
     }
   }
@@ skipping 26 matching lines @@
   } else {
     int32_t internal_diff = internal_timestamp - internal_ref_;
     assert(numerator_ > 0);  // Should not be possible.
     // Do not update references in this method.
     // Switch |denominator_| and |numerator_| to convert the other way.
     return external_ref_ + (internal_diff * denominator_) / numerator_;
   }
 }
 
 }  // namespace webrtc