Add opus audio codec support in remoting

remoting/codec/audio_decoder_opus.h

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef REMOTING_CODEC_AUDIO_DECODER_OPUS_H_
+#define REMOTING_CODEC_AUDIO_DECODER_OPUS_H_
+
+#include "base/basictypes.h"
+#include "base/memory/scoped_ptr.h"
+#include "remoting/codec/audio_decoder.h"
+
+struct OpusDecoder;
+
+namespace remoting {
+
+class AudioPacket;
+
+class AudioDecoderOpus : public AudioDecoder {
+ public:
+  AudioDecoderOpus();
+  virtual ~AudioDecoderOpus();
+
+  // AudioDecoder interface.
+  virtual scoped_ptr<AudioPacket> Decode(
+      scoped_ptr<AudioPacket> packet) OVERRIDE;
+
+ private:
+  void InitDecoder();
+  void DestroyDecoder();
+  bool ResetForPacket(AudioPacket* packet);
+
+  int sampling_rate_;
+  int channels_;
+  OpusDecoder* decoder_;
+
+  DISALLOW_COPY_AND_ASSIGN(AudioDecoderOpus);
+};
+
+}  // namespace remoting
+
+#endif  // REMOTING_CODEC_AUDIO_DECODER_OPUS_H_