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/sound/automaticallychosensoundsystem.h"
15
16namespace rtc {
17
18extern const SoundSystemCreator kLinuxSoundSystemCreators[
19#ifdef HAVE_LIBPULSE
20    2
21#else
22    1
23#endif
24    ];
25
26// The vast majority of Linux systems use ALSA for the device-level sound API,
27// but an increasing number are using PulseAudio for the application API and
28// only using ALSA internally in PulseAudio itself. But like everything on
29// Linux this is user-configurable, so we need to support both and choose the
30// right one at run-time.
31// PulseAudioSoundSystem is designed to only successfully initialize if
32// PulseAudio is installed and running, and if it is running then direct device
33// access using ALSA typically won't work, so if PulseAudioSoundSystem
34// initializes then we choose that. Otherwise we choose ALSA.
35typedef AutomaticallyChosenSoundSystem<
36    kLinuxSoundSystemCreators,
37    ARRAY_SIZE(kLinuxSoundSystemCreators)> LinuxSoundSystem;
38
39}  // namespace rtc
40
41#endif  // WEBRTC_SOUND_LINUXSOUNDSYSTEM_H_
42