components/audio_modem/audio_player_impl.h

   1 // Copyright 2015 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 COMPONENTS_AUDIO_MODEM_AUDIO_PLAYER_IMPL_H_
   6 #define COMPONENTS_AUDIO_MODEM_AUDIO_PLAYER_IMPL_H_
   7
   8 #include <vector>
   9
  10 #include "base/gtest_prod_util.h"
  11 #include "base/macros.h"
  12 #include "base/memory/ref_counted.h"
  13 #include "base/synchronization/lock.h"
  14 #include "components/audio_modem/audio_player.h"
  15 #include "media/audio/audio_io.h"
  16
  17 namespace media {
  18 class AudioBus;
  19 class AudioBusRefCounted;
  20 }
  21
  22 namespace audio_modem {
  23
  24 // The AudioPlayerImpl class will play a set of samples till it is told to stop.
  25 class AudioPlayerImpl final
  26     : public AudioPlayer,
  27       public media::AudioOutputStream::AudioSourceCallback {
  28  public:
  29   AudioPlayerImpl();
  30
  31   // AudioPlayer overrides:
  32   void Initialize() override;
  33   void Play(const scoped_refptr<media::AudioBusRefCounted>& samples) override;
  34   void Stop() override;
  35   void Finalize() override;
  36
  37   // Takes ownership of the stream.
  38   void set_output_stream_for_testing(
  39       media::AudioOutputStream* output_stream_for_testing) {
  40     output_stream_for_testing_.reset(output_stream_for_testing);
  41   }
  42
  43  private:
  44   friend class AudioPlayerTest;
  45   FRIEND_TEST_ALL_PREFIXES(AudioPlayerTest, BasicPlayAndStop);
  46   FRIEND_TEST_ALL_PREFIXES(AudioPlayerTest, OutOfOrderPlayAndStopMultiple);
  47
  48   ~AudioPlayerImpl() override;
  49
  50   // Methods to do our various operations; all of these need to be run on the
  51   // audio thread.
  52   void InitializeOnAudioThread();
  53   void PlayOnAudioThread(
  54       const scoped_refptr<media::AudioBusRefCounted>& samples);
  55   void StopOnAudioThread();
  56   void StopAndCloseOnAudioThread();
  57   void FinalizeOnAudioThread();
  58
  59   // AudioOutputStream::AudioSourceCallback overrides:
  60   // Following methods could be called from *ANY* thread.
  61   int OnMoreData(media::AudioBus* dest, uint32 total_bytes_delay) override;
  62   void OnError(media::AudioOutputStream* stream) override;
  63
  64   // Flushes the audio loop, making sure that any queued operations are
  65   // performed.
  66   void FlushAudioLoopForTesting();
  67
  68   bool is_playing_;
  69
  70   // Self-deleting object.
  71   media::AudioOutputStream* stream_;
  72
  73   scoped_ptr<media::AudioOutputStream> output_stream_for_testing_;
  74
  75   // All fields below here are protected by this lock.
  76   base::Lock state_lock_;
  77
  78   scoped_refptr<media::AudioBusRefCounted> samples_;
  79
  80   // Index to the frame in the samples that we need to play next.
  81   int frame_index_;
  82
  83   DISALLOW_COPY_AND_ASSIGN(AudioPlayerImpl);
  84 };
  85
  86 }  // namespace audio_modem
  87
  88 #endif  // COMPONENTS_AUDIO_MODEM_AUDIO_PLAYER_IMPL_H_