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      1 // Copyright 2013 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_AUDIO_SENDER_AUDIO_ENCODER_H_
      6 #define MEDIA_CAST_AUDIO_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/cast/cast_config.h"
     12 #include "media/cast/cast_environment.h"
     13 
     14 namespace base {
     15 class TimeTicks;
     16 }
     17 
     18 namespace media {
     19 class AudioBus;
     20 }
     21 
     22 namespace media {
     23 namespace cast {
     24 
     25 class AudioEncoder : public base::RefCountedThreadSafe<AudioEncoder> {
     26  public:
     27   typedef base::Callback<void(scoped_ptr<EncodedAudioFrame>,
     28                               const base::TimeTicks&)> FrameEncodedCallback;
     29 
     30   AudioEncoder(const scoped_refptr<CastEnvironment>& cast_environment,
     31                const AudioSenderConfig& audio_config,
     32                const FrameEncodedCallback& frame_encoded_callback);
     33 
     34   // The |audio_bus| must be valid until the |done_callback| is called.
     35   // The callback is called from the main cast thread as soon as the encoder is
     36   // done with |audio_bus|; it does not mean that the encoded data has been
     37   // sent out.
     38   void InsertAudio(const AudioBus* audio_bus,
     39                    const base::TimeTicks& recorded_time,
     40                    const base::Closure& done_callback);
     41 
     42  protected:
     43   virtual ~AudioEncoder();
     44 
     45  private:
     46   friend class base::RefCountedThreadSafe<AudioEncoder>;
     47 
     48   class ImplBase;
     49   class OpusImpl;
     50   class Pcm16Impl;
     51 
     52   // Invokes |impl_|'s encode method on the AUDIO_ENCODER thread while holding
     53   // a ref-count on AudioEncoder.
     54   void EncodeAudio(const AudioBus* audio_bus,
     55                    const base::TimeTicks& recorded_time,
     56                    const base::Closure& done_callback);
     57 
     58   const scoped_refptr<CastEnvironment> cast_environment_;
     59   scoped_ptr<ImplBase> impl_;
     60 
     61   // Used to ensure only one thread invokes InsertAudio().
     62   base::ThreadChecker insert_thread_checker_;
     63 
     64   DISALLOW_COPY_AND_ASSIGN(AudioEncoder);
     65 };
     66 
     67 }  // namespace cast
     68 }  // namespace media
     69 
     70 #endif  // MEDIA_CAST_AUDIO_SENDER_AUDIO_ENCODER_H_
     71