media/cast/sender/audio_encoder.h

   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   OperationalStatus InitializationResult() const;
  37
  38   int GetSamplesPerFrame() const;
  39   base::TimeDelta GetFrameDuration() const;
  40
  41   void InsertAudio(scoped_ptr<AudioBus> audio_bus,
  42                    const base::TimeTicks& recorded_time);
  43
  44  private:
  45   class ImplBase;
  46   class OpusImpl;
  47   class Pcm16Impl;
  48   class AppleAacImpl;
  49
  50   const scoped_refptr<CastEnvironment> cast_environment_;
  51   scoped_refptr<ImplBase> impl_;
  52
  53   // Used to ensure only one thread invokes InsertAudio().
  54   base::ThreadChecker insert_thread_checker_;
  55
  56   DISALLOW_COPY_AND_ASSIGN(AudioEncoder);
  57 };
  58
  59 }  // namespace cast
  60 }  // namespace media
  61
  62 #endif  // MEDIA_CAST_SENDER_AUDIO_ENCODER_H_