1 /* 2 * Copyright 2004 The WebRTC Project Authors. All rights reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 #ifndef WEBRTC_SOUND_LINUXSOUNDSYSTEM_H_ 12 #define WEBRTC_SOUND_LINUXSOUNDSYSTEM_H_ 13 14 #include "webrtc/base/arraysize.h" 15 #include "webrtc/sound/automaticallychosensoundsystem.h" 16 17 namespace rtc { 18 19 extern const SoundSystemCreator kLinuxSoundSystemCreators[ 20 #ifdef HAVE_LIBPULSE 21 2 22 #else 23 1 24 #endif 25 ]; 26 27 // The vast majority of Linux systems use ALSA for the device-level sound API, 28 // but an increasing number are using PulseAudio for the application API and 29 // only using ALSA internally in PulseAudio itself. But like everything on 30 // Linux this is user-configurable, so we need to support both and choose the 31 // right one at run-time. 32 // PulseAudioSoundSystem is designed to only successfully initialize if 33 // PulseAudio is installed and running, and if it is running then direct device 34 // access using ALSA typically won't work, so if PulseAudioSoundSystem 35 // initializes then we choose that. Otherwise we choose ALSA. 36 typedef AutomaticallyChosenSoundSystem< 37 kLinuxSoundSystemCreators, 38 arraysize(kLinuxSoundSystemCreators)> LinuxSoundSystem; 39 40 } // namespace rtc 41 42 #endif // WEBRTC_SOUND_LINUXSOUNDSYSTEM_H_ 43