Moved MixerAudioSource and removed audio_mixer_defines.h.

webrtc/modules/audio_mixer/audio_mixer_defines.h

-/*
- *  Copyright (c) 2011 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_MIXER_AUDIO_MIXER_DEFINES_H_
-#define WEBRTC_MODULES_AUDIO_MIXER_AUDIO_MIXER_DEFINES_H_
-
-#include <memory>
-
-#include "webrtc/base/checks.h"
-#include "webrtc/modules/include/module_common_types.h"
-#include "webrtc/typedefs.h"
-
-namespace webrtc {
-
-// A callback class that all mixer participants must inherit from/implement.
-class MixerAudioSource {
- public:
-  enum class AudioFrameInfo {
-    kNormal,  // The samples in audio_frame are valid and should be used.
-    kMuted,   // The samples in audio_frame should not be used, but should be
-              // implicitly interpreted as zero. Other fields in audio_frame
-              // may be read and should contain meaningful values.
-    kError    // audio_frame will not be used.
-  };
-
-  struct AudioFrameWithMuted {
-    AudioFrame* audio_frame;
-    AudioFrameInfo audio_frame_info;
-  };
-
-  virtual ~MixerAudioSource() = default;
-
-  // The implementation of GetAudioFrameWithMuted should update
-  // audio_frame with new audio every time it's called. Implementing
-  // classes are allowed to return the same AudioFrame pointer on
-  // different calls. The pointer must stay valid until the next
-  // mixing call or until this audio source is disconnected from the
-  // mixer.
-  virtual AudioFrameWithMuted GetAudioFrameWithMuted(int32_t id,
-                                                     int sample_rate_hz) = 0;
-};
-}  // namespace webrtc
-
-#endif  // WEBRTC_MODULES_AUDIO_MIXER_AUDIO_MIXER_DEFINES_H_