1 files changed, 66 insertions, 0 deletions
diff --git a/third_party/libwebrtc/pc/audio_track.h b/third_party/libwebrtc/pc/audio_track.h
new file mode 100644
index 0000000000..ae326b304b
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+++ b/third_party/libwebrtc/pc/audio_track.h
@@ -0,0 +1,66 @@
+/*
+ *  Copyright 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 PC_AUDIO_TRACK_H_
+#define PC_AUDIO_TRACK_H_
+
+#include <string>
+
+#include "api/media_stream_interface.h"
+#include "api/media_stream_track.h"
+#include "api/scoped_refptr.h"
+#include "api/sequence_checker.h"
+#include "rtc_base/system/no_unique_address.h"
+
+namespace webrtc {
+
+// TODO(tommi): Instead of inheriting from `MediaStreamTrack<>`, implement the
+// properties directly in this class. `MediaStreamTrack` doesn't guard against
+// conflicting access, so we'd need to override those methods anyway in this
+// class in order to make sure things are correctly checked.
+class AudioTrack : public MediaStreamTrack<AudioTrackInterface>,
+                   public ObserverInterface {
+ protected:
+  // Protected ctor to force use of factory method.
+  AudioTrack(absl::string_view label,
+             const rtc::scoped_refptr<AudioSourceInterface>& source);
+
+  AudioTrack() = delete;
+  AudioTrack(const AudioTrack&) = delete;
+  AudioTrack& operator=(const AudioTrack&) = delete;
+
+  ~AudioTrack() override;
+
+ public:
+  static rtc::scoped_refptr<AudioTrack> Create(
+      absl::string_view id,
+      const rtc::scoped_refptr<AudioSourceInterface>& source);
+
+  // MediaStreamTrack implementation.
+  std::string kind() const override;
+
+  // AudioTrackInterface implementation.
+  AudioSourceInterface* GetSource() const override;
+
+  void AddSink(AudioTrackSinkInterface* sink) override;
+  void RemoveSink(AudioTrackSinkInterface* sink) override;
+
+ private:
+  // ObserverInterface implementation.
+  void OnChanged() override;
+
+ private:
+  const rtc::scoped_refptr<AudioSourceInterface> audio_source_;
+  RTC_NO_UNIQUE_ADDRESS webrtc::SequenceChecker signaling_thread_checker_;
+};
+
+}  // namespace webrtc
+
+#endif  // PC_AUDIO_TRACK_H_