chrome/renderer/media/cast_receiver_audio_valve.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 CHROME_RENDERER_MEDIA_CAST_RECEIVER_AUDIO_VALVE_H_
   6 #define CHROME_RENDERER_MEDIA_CAST_RECEIVER_AUDIO_VALVE_H_
   7
   8 #include "base/synchronization/lock.h"
   9 #include "media/base/audio_capturer_source.h"
  10
  11 namespace media {
  12 class AudioBus;
  13 }
  14
  15 // Forwards calls to |cb| until Stop is called.
  16 // Thread-safe.
  17 // All functions may block depending on contention.
  18 class CastReceiverAudioValve :
  19     public media::AudioCapturerSource::CaptureCallback,
  20     public base::RefCountedThreadSafe<CastReceiverAudioValve> {
  21  public:
  22   explicit CastReceiverAudioValve(
  23       media::AudioCapturerSource::CaptureCallback* cb);
  24
  25   // AudioCapturerSource::CaptureCallback implementation.
  26   void Capture(const media::AudioBus* audio_source,
  27                int audio_delay_milliseconds,
  28                double volume,
  29                bool key_pressed) override;
  30   void OnCaptureError() override;
  31
  32   // When this returns, no more calls will be forwarded to |cb|.
  33   void Stop();
  34
  35  private:
  36   friend class base::RefCountedThreadSafe<CastReceiverAudioValve>;
  37   ~CastReceiverAudioValve() override;
  38   media::AudioCapturerSource::CaptureCallback* cb_;
  39   base::Lock lock_;
  40 };
  41
  42 #endif  // CHROME_RENDERER_MEDIA_CAST_RECEIVER_AUDIO_VALVE_H_