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();
  20   virtual ~AudioManagerPulse();
  21
  22   static AudioManager* Create();
  23
  24   // Implementation of AudioManager.
  25   virtual bool HasAudioOutputDevices() OVERRIDE;
  26   virtual bool HasAudioInputDevices() OVERRIDE;
  27   virtual void ShowAudioInputSettings() OVERRIDE;
  28   virtual void GetAudioInputDeviceNames(
  29       AudioDeviceNames* device_names) OVERRIDE;
  30   virtual void GetAudioOutputDeviceNames(
  31       AudioDeviceNames* device_names) OVERRIDE;
  32   virtual AudioParameters GetInputStreamParameters(
  33       const std::string& device_id) OVERRIDE;
  34
  35   // Implementation of AudioManagerBase.
  36   virtual AudioOutputStream* MakeLinearOutputStream(
  37       const AudioParameters& params) OVERRIDE;
  38   virtual AudioOutputStream* MakeLowLatencyOutputStream(
  39       const AudioParameters& params,
  40       const std::string& device_id,
  41       const std::string& input_device_id) OVERRIDE;
  42   virtual AudioInputStream* MakeLinearInputStream(
  43       const AudioParameters& params, const std::string& device_id) OVERRIDE;
  44   virtual AudioInputStream* MakeLowLatencyInputStream(
  45       const AudioParameters& params, const std::string& device_id) OVERRIDE;
  46
  47  protected:
  48   virtual AudioParameters GetPreferredOutputStreamParameters(
  49       const std::string& output_device_id,
  50       const AudioParameters& input_params) OVERRIDE;
  51
  52  private:
  53   bool Init();
  54   void DestroyPulse();
  55
  56   void GetAudioDeviceNames(bool input, media::AudioDeviceNames* device_names);
  57
  58   // Callback to get the devices' info like names, used by GetInputDevices().
  59   static void InputDevicesInfoCallback(pa_context* context,
  60                                        const pa_source_info* info,
  61                                        int error, void* user_data);
  62   static void OutputDevicesInfoCallback(pa_context* context,
  63                                         const pa_sink_info* info,
  64                                         int error, void* user_data);
  65
  66   // Callback to get the native sample rate of PulseAudio, used by
  67   // GetNativeSampleRate().
  68   static void SampleRateInfoCallback(pa_context* context,
  69                                      const pa_server_info* info,
  70                                      void* user_data);
  71
  72   // Called by MakeLinearOutputStream and MakeLowLatencyOutputStream.
  73   AudioOutputStream* MakeOutputStream(const AudioParameters& params,
  74                                       const std::string& input_device_id);
  75
  76   // Called by MakeLinearInputStream and MakeLowLatencyInputStream.
  77   AudioInputStream* MakeInputStream(const AudioParameters& params,
  78                                     const std::string& device_id);
  79
  80   // Gets the native sample rate of Pulse.
  81   int GetNativeSampleRate();
  82
  83   pa_threaded_mainloop* input_mainloop_;
  84   pa_context* input_context_;
  85   AudioDeviceNames* devices_;
  86   int native_input_sample_rate_;
  87
  88   DISALLOW_COPY_AND_ASSIGN(AudioManagerPulse);
  89 };
  90
  91 }  // namespace media
  92
  93 #endif  // MEDIA_AUDIO_PULSE_AUDIO_MANAGER_PULSE_H_