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
14namespace base {
15class TimeTicks;
16}
17
18namespace media {
19namespace cast {
20
21class 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