media/audio/alsa/audio_manager_alsa.h

   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_AUDIO_ALSA_AUDIO_MANAGER_ALSA_H_
   6 #define MEDIA_AUDIO_ALSA_AUDIO_MANAGER_ALSA_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 AudioManagerAlsa : public AudioManagerBase {
  19  public:
  20   AudioManagerAlsa(AudioLogFactory* audio_log_factory);
  21
  22   static void ShowLinuxAudioInputSettings();
  23
  24   // Implementation of AudioManager.
  25   bool HasAudioOutputDevices() override;
  26   bool HasAudioInputDevices() override;
  27   void ShowAudioInputSettings() override;
  28   void GetAudioInputDeviceNames(AudioDeviceNames* device_names) override;
  29   void GetAudioOutputDeviceNames(AudioDeviceNames* device_names) override;
  30   AudioParameters GetInputStreamParameters(
  31       const std::string& device_id) override;
  32
  33   // Implementation of AudioManagerBase.
  34   AudioOutputStream* MakeLinearOutputStream(
  35       const AudioParameters& params) override;
  36   AudioOutputStream* MakeLowLatencyOutputStream(
  37       const AudioParameters& params,
  38       const std::string& device_id) override;
  39   AudioInputStream* MakeLinearInputStream(
  40       const AudioParameters& params,
  41       const std::string& device_id) override;
  42   AudioInputStream* MakeLowLatencyInputStream(
  43       const AudioParameters& params,
  44       const std::string& device_id) override;
  45
  46  protected:
  47   ~AudioManagerAlsa() override;
  48
  49   AudioParameters GetPreferredOutputStreamParameters(
  50       const std::string& output_device_id,
  51       const AudioParameters& input_params) override;
  52
  53  private:
  54   enum StreamType {
  55     kStreamPlayback = 0,
  56     kStreamCapture,
  57   };
  58
  59   // Gets a list of available ALSA devices.
  60   void GetAlsaAudioDevices(StreamType type,
  61                            media::AudioDeviceNames* device_names);
  62
  63   // Gets the ALSA devices' names and ids that support streams of the
  64   // given type.
  65   void GetAlsaDevicesInfo(StreamType type,
  66                           void** hint,
  67                           media::AudioDeviceNames* device_names);
  68
  69   // Checks if the specific ALSA device is available.
  70   static bool IsAlsaDeviceAvailable(StreamType type,
  71                                     const char* device_name);
  72
  73   static const char* UnwantedDeviceTypeWhenEnumerating(
  74       StreamType wanted_type);
  75
  76   // Returns true if a device is present for the given stream type.
  77   bool HasAnyAlsaAudioDevice(StreamType stream);
  78
  79   // Called by MakeLinearOutputStream and MakeLowLatencyOutputStream.
  80   AudioOutputStream* MakeOutputStream(const AudioParameters& params);
  81
  82   // Called by MakeLinearInputStream and MakeLowLatencyInputStream.
  83   AudioInputStream* MakeInputStream(const AudioParameters& params,
  84                                     const std::string& device_id);
  85
  86   scoped_ptr<AlsaWrapper> wrapper_;
  87
  88   DISALLOW_COPY_AND_ASSIGN(AudioManagerAlsa);
  89 };
  90
  91 }  // namespace media
  92
  93 #endif  // MEDIA_AUDIO_ALSA_AUDIO_MANAGER_ALSA_H_