remoting/host/audio_capturer.h

   1 // Copyright (c) 2012 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 REMOTING_HOST_AUDIO_CAPTURER_H_
   6 #define REMOTING_HOST_AUDIO_CAPTURER_H_
   7
   8 #include "base/callback.h"
   9 #include "base/memory/scoped_ptr.h"
  10
  11 namespace remoting {
  12
  13 class AudioPacket;
  14
  15 class AudioCapturer {
  16  public:
  17   typedef base::Callback<void(scoped_ptr<AudioPacket> packet)>
  18       PacketCapturedCallback;
  19
  20   virtual ~AudioCapturer() {}
  21
  22   // Returns true if audio capturing is supported on this platform. If this
  23   // returns true, then Create() must not return NULL.
  24   static bool IsSupported();
  25   static scoped_ptr<AudioCapturer> Create();
  26
  27   // Capturers should sample at a 44.1 or 48 kHz sampling rate, in uncompressed
  28   // PCM stereo format. Capturers may choose the number of frames per packet.
  29   // Returns true on success.
  30   virtual bool Start(const PacketCapturedCallback& callback) = 0;
  31   // Stops the audio capturer, and frees the OS-specific audio capture
  32   // resources.
  33   virtual void Stop() = 0;
  34   // Returns true if the audio capturer is running.
  35   virtual bool IsStarted() = 0;
  36
  37   static bool IsValidSampleRate(int sample_rate);
  38 };
  39
  40 }  // namespace remoting
  41
  42 #endif  // REMOTING_HOST_AUDIO_CAPTURER_H_