audio_manager_openbsd.cc revision 2a99a7e74a7f215066514fe81d2bfa6639d9eddd 
1// Copyright (c) 2012 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#include "media/audio/openbsd/audio_manager_openbsd.h"
6
7#include <fcntl.h>
8
9#include "base/command_line.h"
10#include "base/file_path.h"
11#include "base/stl_util.h"
12#include "media/audio/audio_output_dispatcher.h"
13#include "media/audio/audio_parameters.h"
14#include "media/audio/audio_util.h"
15#include "media/audio/pulse/pulse_output.h"
16#include "media/audio/pulse/pulse_stubs.h"
17#include "media/base/channel_layout.h"
18#include "media/base/limits.h"
19#include "media/base/media_switches.h"
20
21using media_audio_pulse::kModulePulse;
22using media_audio_pulse::InitializeStubs;
23using media_audio_pulse::StubPathMap;
24
25namespace media {
26
27// Maximum number of output streams that can be open simultaneously.
28static const int kMaxOutputStreams = 50;
29
30// Default sample rate for input and output streams.
31static const int kDefaultSampleRate = 48000;
32
33static const base::FilePath::CharType kPulseLib[] =
34    FILE_PATH_LITERAL("libpulse.so.0");
35
36// Implementation of AudioManager.
37static bool HasAudioHardware() {
38  int fd;
39  const char *file;
40
41  if ((file = getenv("AUDIOCTLDEVICE")) == 0 || *file == '\0')
42    file = "/dev/audioctl";
43
44  if ((fd = open(file, O_RDONLY)) < 0)
45    return false;
46
47  close(fd);
48  return true;
49}
50
51bool AudioManagerOpenBSD::HasAudioOutputDevices() {
52  return HasAudioHardware();
53}
54
55bool AudioManagerOpenBSD::HasAudioInputDevices() {
56  return HasAudioHardware();
57}
58
59AudioParameters AudioManagerOpenBSD::GetInputStreamParameters(
60    const std::string& device_id) {
61  static const int kDefaultInputBufferSize = 1024;
62
63  return AudioParameters(
64      AudioParameters::AUDIO_PCM_LOW_LATENCY, CHANNEL_LAYOUT_STEREO,
65      kDefaultSampleRate, 16, kDefaultInputBufferSize);
66}
67
68AudioManagerOpenBSD::AudioManagerOpenBSD()
69    : pulse_library_is_initialized_(false) {
70  SetMaxOutputStreamsAllowed(kMaxOutputStreams);
71  StubPathMap paths;
72
73  // Check if the pulse library is avialbale.
74  paths[kModulePulse].push_back(kPulseLib);
75  if (!InitializeStubs(paths)) {
76    DLOG(WARNING) << "Failed on loading the Pulse library and symbols";
77    return;
78  }
79
80  pulse_library_is_initialized_ = true;
81}
82
83AudioManagerOpenBSD::~AudioManagerOpenBSD() {
84  Shutdown();
85}
86
87AudioOutputStream* AudioManagerOpenBSD::MakeLinearOutputStream(
88    const AudioParameters& params) {
89  DCHECK_EQ(AudioParameters::AUDIO_PCM_LINEAR, params.format);
90  return MakeOutputStream(params);
91}
92
93AudioOutputStream* AudioManagerOpenBSD::MakeLowLatencyOutputStream(
94    const AudioParameters& params) {
95  DCHECK_EQ(AudioParameters::AUDIO_PCM_LOW_LATENCY, params.format);
96  return MakeOutputStream(params);
97}
98
99AudioInputStream* AudioManagerOpenBSD::MakeLinearInputStream(
100    const AudioParameters& params, const std::string& device_id) {
101  DCHECK_EQ(AudioParameters::AUDIO_PCM_LINEAR, params.format);
102  NOTIMPLEMENTED();
103  return NULL;
104}
105
106AudioInputStream* AudioManagerOpenBSD::MakeLowLatencyInputStream(
107    const AudioParameters& params, const std::string& device_id) {
108  DCHECK_EQ(AudioParameters::AUDIO_PCM_LOW_LATENCY, params.format);
109  NOTIMPLEMENTED();
110  return NULL;
111}
112
113AudioParameters AudioManagerOpenBSD::GetPreferredOutputStreamParameters(
114    const AudioParameters& input_params) {
115  static const int kDefaultOutputBufferSize = 512;
116
117  ChannelLayout channel_layout = CHANNEL_LAYOUT_STEREO;
118  int sample_rate = kDefaultSampleRate;
119  int buffer_size = kDefaultOutputBufferSize;
120  int bits_per_sample = 16;
121  int input_channels = 0;
122  if (input_params.IsValid()) {
123    sample_rate = input_params.sample_rate();
124    bits_per_sample = input_params.bits_per_sample();
125    channel_layout = input_params.channel_layout();
126    input_channels = input_params.input_channels();
127    buffer_size = std::min(buffer_size, input_params.frames_per_buffer());
128  }
129
130  int user_buffer_size = GetUserBufferSize();
131  if (user_buffer_size)
132    buffer_size = user_buffer_size;
133
134  return AudioParameters(
135      AudioParameters::AUDIO_PCM_LOW_LATENCY, channel_layout, input_channels,
136      sample_rate, bits_per_sample, buffer_size);
137}
138
139AudioOutputStream* AudioManagerOpenBSD::MakeOutputStream(
140    const AudioParameters& params) {
141  if (pulse_library_is_initialized_)
142    return new PulseAudioOutputStream(params, this);
143
144  return NULL;
145}
146
147// TODO(xians): Merge AudioManagerOpenBSD with AudioManagerPulse;
148// static
149AudioManager* CreateAudioManager() {
150  return new AudioManagerOpenBSD();
151}
152
153}  // namespace media
154