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 #include "media/cast/sender/sender_encoded_frame.h"
  14
  15 namespace base {
  16 class TimeTicks;
  17 }
  18
  19 namespace media {
  20 namespace cast {
  21
  22 class AudioEncoder {
  23  public:
  24   // Callback to deliver each SenderEncodedFrame, plus the number of audio
  25   // samples skipped since the last frame.
  26   using FrameEncodedCallback =
  27       base::Callback<void(scoped_ptr<SenderEncodedFrame>, int)>;
  28
  29   AudioEncoder(const scoped_refptr<CastEnvironment>& cast_environment,
  30                int num_channels,
  31                int sampling_rate,
  32                int bitrate,
  33                Codec codec,
  34                const FrameEncodedCallback& frame_encoded_callback);
  35   virtual ~AudioEncoder();
  36
  37   OperationalStatus InitializationResult() const;
  38
  39   int GetSamplesPerFrame() const;
  40   base::TimeDelta GetFrameDuration() const;
  41
  42   void InsertAudio(scoped_ptr<AudioBus> audio_bus,
  43                    const base::TimeTicks& recorded_time);
  44
  45  private:
  46   class ImplBase;
  47   class OpusImpl;
  48   class Pcm16Impl;
  49   class AppleAacImpl;
  50
  51   const scoped_refptr<CastEnvironment> cast_environment_;
  52   scoped_refptr<ImplBase> impl_;
  53
  54   // Used to ensure only one thread invokes InsertAudio().
  55   base::ThreadChecker insert_thread_checker_;
  56
  57   DISALLOW_COPY_AND_ASSIGN(AudioEncoder);
  58 };
  59
  60 }  // namespace cast
  61 }  // namespace media
  62
  63 #endif  // MEDIA_CAST_SENDER_AUDIO_ENCODER_H_