media/audio/pulse/audio_manager_pulse.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_PULSE_AUDIO_MANAGER_PULSE_H_
   6 #define MEDIA_AUDIO_PULSE_AUDIO_MANAGER_PULSE_H_
   7
   8 #include <pulse/pulseaudio.h>
   9 #include <string>
  10
  11 #include "base/compiler_specific.h"
  12 #include "base/memory/ref_counted.h"
  13 #include "media/audio/audio_manager_base.h"
  14
  15 namespace media {
  16
  17 class MEDIA_EXPORT AudioManagerPulse : public AudioManagerBase {
  18  public:
  19   AudioManagerPulse(AudioLogFactory* audio_log_factory);
  20   ~AudioManagerPulse() override;
  21
  22   static AudioManager* Create(AudioLogFactory* audio_log_factory);
  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   AudioParameters GetPreferredOutputStreamParameters(
  48       const std::string& output_device_id,
  49       const AudioParameters& input_params) override;
  50
  51  private:
  52   bool Init();
  53   void DestroyPulse();
  54
  55   void GetAudioDeviceNames(bool input, media::AudioDeviceNames* device_names);
  56
  57   // Callback to get the devices' info like names, used by GetInputDevices().
  58   static void InputDevicesInfoCallback(pa_context* context,
  59                                        const pa_source_info* info,
  60                                        int error, void* user_data);
  61   static void OutputDevicesInfoCallback(pa_context* context,
  62                                         const pa_sink_info* info,
  63                                         int error, void* user_data);
  64
  65   // Callback to get the native sample rate of PulseAudio, used by
  66   // GetNativeSampleRate().
  67   static void SampleRateInfoCallback(pa_context* context,
  68                                      const pa_server_info* info,
  69                                      void* user_data);
  70
  71   // Called by MakeLinearOutputStream and MakeLowLatencyOutputStream.
  72   AudioOutputStream* MakeOutputStream(const AudioParameters& params,
  73                                       const std::string& device_id);
  74
  75   // Called by MakeLinearInputStream and MakeLowLatencyInputStream.
  76   AudioInputStream* MakeInputStream(const AudioParameters& params,
  77                                     const std::string& device_id);
  78
  79   // Gets the native sample rate of Pulse.
  80   int GetNativeSampleRate();
  81
  82   pa_threaded_mainloop* input_mainloop_;
  83   pa_context* input_context_;
  84   AudioDeviceNames* devices_;
  85   int native_input_sample_rate_;
  86
  87   DISALLOW_COPY_AND_ASSIGN(AudioManagerPulse);
  88 };
  89
  90 }  // namespace media
  91
  92 #endif  // MEDIA_AUDIO_PULSE_AUDIO_MANAGER_PULSE_H_