Move AudioDecoder and related stuff to the api/ directory

webrtc/modules/audio_coding/codecs/audio_format.h

-/*
- *  Copyright (c) 2016 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.
- */
-
-#ifndef WEBRTC_MODULES_AUDIO_CODING_CODECS_AUDIO_FORMAT_H_
-#define WEBRTC_MODULES_AUDIO_CODING_CODECS_AUDIO_FORMAT_H_
-
-#include <map>
-#include <ostream>
-#include <string>
-#include <utility>
-
-namespace webrtc {
-
-// SDP specification for a single audio codec.
-// NOTE: This class is still under development and may change without notice.
-struct SdpAudioFormat {
-  using Parameters = std::map<std::string, std::string>;
-
-  SdpAudioFormat(const SdpAudioFormat&);
-  SdpAudioFormat(SdpAudioFormat&&);
-  SdpAudioFormat(const char* name, int clockrate_hz, int num_channels);
-  SdpAudioFormat(const std::string& name, int clockrate_hz, int num_channels);
-  SdpAudioFormat(const char* name,
-                 int clockrate_hz,
-                 int num_channels,
-                 const Parameters& param);
-  SdpAudioFormat(const std::string& name,
-                 int clockrate_hz,
-                 int num_channels,
-                 const Parameters& param);
-  ~SdpAudioFormat();
-
-  SdpAudioFormat& operator=(const SdpAudioFormat&);
-  SdpAudioFormat& operator=(SdpAudioFormat&&);
-
-  friend bool operator==(const SdpAudioFormat& a, const SdpAudioFormat& b);
-  friend bool operator!=(const SdpAudioFormat& a, const SdpAudioFormat& b) {
-    return !(a == b);
-  }
-
-  std::string name;
-  int clockrate_hz;
-  int num_channels;
-  Parameters parameters;
-};
-
-void swap(SdpAudioFormat& a, SdpAudioFormat& b);
-std::ostream& operator<<(std::ostream& os, const SdpAudioFormat& saf);
-
-struct AudioCodecSpec {
-  SdpAudioFormat format;
-  bool allow_comfort_noise;  // This encoder can be used with an external
-                             // comfort noise generator.
-};
-
-}  // namespace webrtc
-
-#endif  // WEBRTC_MODULES_AUDIO_CODING_CODECS_AUDIO_FORMAT_H_