audio_manager_openbsd.cc revision 868fa2fe829687343ffae624259930155e16dbd8 
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    const std::string& input_device_id) {
96  DCHECK_EQ(AudioParameters::AUDIO_PCM_LOW_LATENCY, params.format);
97  return MakeOutputStream(params);
98}
99
100AudioInputStream* AudioManagerOpenBSD::MakeLinearInputStream(
101    const AudioParameters& params, const std::string& device_id) {
102  DCHECK_EQ(AudioParameters::AUDIO_PCM_LINEAR, params.format);
103  NOTIMPLEMENTED();
104  return NULL;
105}
106
107AudioInputStream* AudioManagerOpenBSD::MakeLowLatencyInputStream(
108    const AudioParameters& params, const std::string& device_id) {
109  DCHECK_EQ(AudioParameters::AUDIO_PCM_LOW_LATENCY, params.format);
110  NOTIMPLEMENTED();
111  return NULL;
112}
113
114AudioParameters AudioManagerOpenBSD::GetPreferredOutputStreamParameters(
115    const AudioParameters& input_params) {
116  static const int kDefaultOutputBufferSize = 512;
117
118  ChannelLayout channel_layout = CHANNEL_LAYOUT_STEREO;
119  int sample_rate = kDefaultSampleRate;
120  int buffer_size = kDefaultOutputBufferSize;
121  int bits_per_sample = 16;
122  int input_channels = 0;
123  if (input_params.IsValid()) {
124    sample_rate = input_params.sample_rate();
125    bits_per_sample = input_params.bits_per_sample();
126    channel_layout = input_params.channel_layout();
127    input_channels = input_params.input_channels();
128    buffer_size = std::min(buffer_size, input_params.frames_per_buffer());
129  }
130
131  int user_buffer_size = GetUserBufferSize();
132  if (user_buffer_size)
133    buffer_size = user_buffer_size;
134
135  return AudioParameters(
136      AudioParameters::AUDIO_PCM_LOW_LATENCY, channel_layout, input_channels,
137      sample_rate, bits_per_sample, buffer_size);
138}
139
140AudioOutputStream* AudioManagerOpenBSD::MakeOutputStream(
141    const AudioParameters& params) {
142  if (pulse_library_is_initialized_)
143    return new PulseAudioOutputStream(params, this);
144
145  return NULL;
146}
147
148// TODO(xians): Merge AudioManagerOpenBSD with AudioManagerPulse;
149// static
150AudioManager* CreateAudioManager() {
151  return new AudioManagerOpenBSD();
152}
153
154}  // namespace media
155