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      1 // Copyright 2014 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef MEDIA_CAST_SENDER_AUDIO_ENCODER_H_
      6 #define MEDIA_CAST_SENDER_AUDIO_ENCODER_H_
      7 
      8 #include "base/memory/ref_counted.h"
      9 #include "base/memory/scoped_ptr.h"
     10 #include "base/threading/thread_checker.h"
     11 #include "media/base/audio_bus.h"
     12 #include "media/cast/cast_environment.h"
     13 
     14 namespace base {
     15 class TimeTicks;
     16 }
     17 
     18 namespace media {
     19 namespace cast {
     20 
     21 class AudioEncoder {
     22  public:
     23   // Callback to deliver each EncodedFrame, plus the number of audio samples
     24   // skipped since the last frame.
     25   typedef base::Callback<void(scoped_ptr<EncodedFrame>, int)>
     26       FrameEncodedCallback;
     27 
     28   AudioEncoder(const scoped_refptr<CastEnvironment>& cast_environment,
     29                int num_channels,
     30                int sampling_rate,
     31                int bitrate,
     32                Codec codec,
     33                const FrameEncodedCallback& frame_encoded_callback);
     34   virtual ~AudioEncoder();
     35 
     36   CastInitializationStatus InitializationResult() const;
     37 
     38   int GetSamplesPerFrame() const;
     39 
     40   void InsertAudio(scoped_ptr<AudioBus> audio_bus,
     41                    const base::TimeTicks& recorded_time);
     42 
     43  private:
     44   class ImplBase;
     45   class OpusImpl;
     46   class Pcm16Impl;
     47 
     48   const scoped_refptr<CastEnvironment> cast_environment_;
     49   scoped_refptr<ImplBase> impl_;
     50 
     51   // Used to ensure only one thread invokes InsertAudio().
     52   base::ThreadChecker insert_thread_checker_;
     53 
     54   DISALLOW_COPY_AND_ASSIGN(AudioEncoder);
     55 };
     56 
     57 }  // namespace cast
     58 }  // namespace media
     59 
     60 #endif  // MEDIA_CAST_SENDER_AUDIO_ENCODER_H_
     61