Revert of Opus implementation of the AudioDecoderFactoryTemplate API

webrtc/api/audio_codecs/opus/audio_decoder_opus.cc

-/*
- *  Copyright (c) 2017 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.
- */
-
-#include "webrtc/api/audio_codecs/opus/audio_decoder_opus.h"
-
-#include <memory>
-#include <utility>
-#include <vector>
-
-#include "webrtc/base/ptr_util.h"
-#include "webrtc/common_types.h"
-#include "webrtc/modules/audio_coding/codecs/opus/audio_decoder_opus.h"
-
-namespace webrtc {
-
-rtc::Optional<AudioDecoderOpus::Config> AudioDecoderOpus::SdpToConfig(
-    const SdpAudioFormat& format) {
-  const rtc::Optional<int> num_channels = [&] {
-    auto stereo = format.parameters.find("stereo");
-    if (stereo != format.parameters.end()) {
-      if (stereo->second == "0") {
-        return rtc::Optional<int>(1);
-      } else if (stereo->second == "1") {
-        return rtc::Optional<int>(2);
-      } else {
-        return rtc::Optional<int>();  // Bad stereo parameter.
-      }
-    }
-    return rtc::Optional<int>(1);  // Default to mono.
-  }();
-  if (STR_CASE_CMP(format.name.c_str(), "opus") == 0 &&
-      format.clockrate_hz == 48000 && format.num_channels == 2 &&
-      num_channels) {
-    return rtc::Optional<Config>(Config{*num_channels});
-  } else {
-    return rtc::Optional<Config>();
-  }
-}
-
-void AudioDecoderOpus::AppendSupportedDecoders(
-    std::vector<AudioCodecSpec>* specs) {
-  AudioCodecInfo opus_info{48000, 1, 64000, 6000, 510000};
-  opus_info.allow_comfort_noise = false;
-  opus_info.supports_network_adaption = true;
-  SdpAudioFormat opus_format(
-      {"opus", 48000, 2, {{"minptime", "10"}, {"useinbandfec", "1"}}});
-  specs->push_back({std::move(opus_format), std::move(opus_info)});
-}
-
-std::unique_ptr<AudioDecoder> AudioDecoderOpus::MakeAudioDecoder(
-    Config config) {
-  return rtc::MakeUnique<AudioDecoderOpusImpl>(config.num_channels);
-}
-
-}  // namespace webrtc