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 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) OVERRIDE; 41 virtual AudioInputStream* MakeLinearInputStream( 42 const AudioParameters& params, const std::string& device_id) OVERRIDE; 43 virtual AudioInputStream* MakeLowLatencyInputStream( 44 const AudioParameters& params, const std::string& device_id) OVERRIDE; 45 46 protected: 47 virtual ~AudioManagerAlsa(); 48 49 virtual 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_ 94
