media/audio/linux/audio_manager_linux.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 MEDIA_AUDIO_LINUX_AUDIO_MANAGER_LINUX_H_
   6 #define MEDIA_AUDIO_LINUX_AUDIO_MANAGER_LINUX_H_
   7
   8 #include <string>
   9 #include "base/compiler_specific.h"
  10 #include "base/memory/ref_counted.h"
  11 #include "base/threading/thread.h"
  12 #include "media/audio/audio_manager_base.h"
  13
  14 namespace media {
  15
  16 class AlsaWrapper;
  17
  18 class MEDIA_EXPORT AudioManagerLinux : public AudioManagerBase {
  19  public:
  20   AudioManagerLinux();
  21
  22   static void ShowLinuxAudioInputSettings();
  23
  24   // Implementation of AudioManager.
  25   virtual bool HasAudioOutputDevices() OVERRIDE;
  26   virtual bool HasAudioInputDevices() OVERRIDE;
  27   virtual void ShowAudioInputSettings() OVERRIDE;
  28   virtual void GetAudioInputDeviceNames(media::AudioDeviceNames* device_names)
  29       OVERRIDE;
  30   virtual AudioParameters GetInputStreamParameters(
  31       const std::string& device_id) OVERRIDE;
  32
  33   // Implementation of AudioManagerBase.
  34   virtual AudioOutputStream* MakeLinearOutputStream(
  35       const AudioParameters& params) OVERRIDE;
  36   virtual AudioOutputStream* MakeLowLatencyOutputStream(
  37       const AudioParameters& params,
  38       const std::string& input_device_id) OVERRIDE;
  39   virtual AudioInputStream* MakeLinearInputStream(
  40       const AudioParameters& params, const std::string& device_id) OVERRIDE;
  41   virtual AudioInputStream* MakeLowLatencyInputStream(
  42       const AudioParameters& params, const std::string& device_id) OVERRIDE;
  43
  44  protected:
  45   virtual ~AudioManagerLinux();
  46
  47   virtual AudioParameters GetPreferredOutputStreamParameters(
  48       const AudioParameters& input_params) OVERRIDE;
  49
  50  private:
  51   enum StreamType {
  52     kStreamPlayback = 0,
  53     kStreamCapture,
  54   };
  55
  56   // Gets a list of available ALSA input devices.
  57   void GetAlsaAudioInputDevices(media::AudioDeviceNames* device_names);
  58
  59   // Gets the ALSA devices' names and ids.
  60   void GetAlsaDevicesInfo(void** hint, media::AudioDeviceNames* device_names);
  61
  62   // Checks if the specific ALSA device is available.
  63   bool IsAlsaDeviceAvailable(const char* device_name);
  64
  65   // Returns true if a device is present for the given stream type.
  66   bool HasAnyAlsaAudioDevice(StreamType stream);
  67
  68   // Called by MakeLinearOutputStream and MakeLowLatencyOutputStream.
  69   AudioOutputStream* MakeOutputStream(const AudioParameters& params);
  70
  71   // Called by MakeLinearInputStream and MakeLowLatencyInputStream.
  72   AudioInputStream* MakeInputStream(const AudioParameters& params,
  73                                     const std::string& device_id);
  74
  75   scoped_ptr<AlsaWrapper> wrapper_;
  76
  77   DISALLOW_COPY_AND_ASSIGN(AudioManagerLinux);
  78 };
  79
  80 }  // namespace media
  81
  82 #endif  // MEDIA_AUDIO_LINUX_AUDIO_MANAGER_LINUX_H_