Moved MixerAudioSource and removed audio_mixer_defines.h.

webrtc/modules/audio_mixer/audio_mixer.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_H_
 #define WEBRTC_MODULES_AUDIO_MIXER_AUDIO_MIXER_H_
 
 #include <memory>
 
-#include "webrtc/modules/audio_mixer/audio_mixer_defines.h"
 #include "webrtc/modules/include/module.h"
 #include "webrtc/modules/include/module_common_types.h"
 
 namespace webrtc {
 
 class AudioMixer {
  public:
   static const int kMaximumAmountOfMixedAudioSources = 3;
   enum Frequency {
     kNbInHz = 8000,
     kWbInHz = 16000,
     kSwbInHz = 32000,
     kFbInHz = 48000,
     kDefaultFrequency = kWbInHz
   };
 
+  // A callback class that all mixer participants must inherit from/implement.
+  class Source {
+   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;
+    };
+
+    // 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;
+
+   protected:
+    virtual ~Source() {}
+  };
+
   // Factory method. Constructor disabled.
   static std::unique_ptr<AudioMixer> Create(int id);
   virtual ~AudioMixer() {}
 
   // Add/remove audio sources as candidates for mixing.
-  virtual int32_t SetMixabilityStatus(MixerAudioSource* audio_source,
-                                      bool mixable) = 0;
+  virtual int32_t SetMixabilityStatus(Source* audio_source, bool mixable) = 0;
   // Returns true if an audio source is a candidate for mixing.
-  virtual bool MixabilityStatus(const MixerAudioSource& audio_source) const = 0;
+  virtual bool MixabilityStatus(const Source& audio_source) const = 0;
 
   // Inform the mixer that the audio source should always be mixed and not
   // count toward the number of mixed audio sources. Note that an audio source
   // must have been added to the mixer (by calling SetMixabilityStatus())
   // before this function can be successfully called.
-  virtual int32_t SetAnonymousMixabilityStatus(MixerAudioSource* audio_source,
+  virtual int32_t SetAnonymousMixabilityStatus(Source* audio_source,
                                                bool mixable) = 0;
 
   // Performs mixing by asking registered audio sources for audio. The
   // mixed result is placed in the provided AudioFrame. Can only be
   // called from a single thread. The rate and channels arguments
   // specify the rate and number of channels of the mix result.
   virtual void Mix(int sample_rate,
                    size_t number_of_channels,
                    AudioFrame* audio_frame_for_mixing) = 0;
 
   // Returns true if the audio source is mixed anonymously.
-  virtual bool AnonymousMixabilityStatus(
-      const MixerAudioSource& audio_source) const = 0;
+  virtual bool AnonymousMixabilityStatus(const Source& audio_source) const = 0;
 
   // Output level functions for VoEVolumeControl. Return value
   // between 0 and 9 is returned by voe::AudioLevel.
   virtual int GetOutputAudioLevel() = 0;
 
   // Return value between 0 and 0x7fff is returned by voe::AudioLevel.
   virtual int GetOutputAudioLevelFullRange() = 0;
 
  protected:
   AudioMixer() {}
 
  private:
   RTC_DISALLOW_COPY_AND_ASSIGN(AudioMixer);
 };
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_AUDIO_MIXER_AUDIO_MIXER_H_