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.
5 #include "media/audio/cras/audio_manager_cras.h"
7 #include "base/command_line.h"
8 #include "base/environment.h"
9 #include "base/logging.h"
10 #include "base/nix/xdg_util.h"
11 #include "base/stl_util.h"
12 #include "media/audio/cras/cras_input.h"
13 #include "media/audio/cras/cras_unified.h"
14 #include "media/base/channel_layout.h"
18 static void AddDefaultDevice(AudioDeviceNames* device_names) {
19 DCHECK(device_names->empty());
21 // Cras will route audio from a proper physical device automatically.
22 device_names->push_back(
23 AudioDeviceName(AudioManagerBase::kDefaultDeviceName,
24 AudioManagerBase::kDefaultDeviceId));
27 // Maximum number of output streams that can be open simultaneously.
28 static const int kMaxOutputStreams = 50;
30 // Default sample rate for input and output streams.
31 static const int kDefaultSampleRate = 48000;
33 bool AudioManagerCras::HasAudioOutputDevices() {
37 bool AudioManagerCras::HasAudioInputDevices() {
41 AudioManagerCras::AudioManagerCras(AudioLogFactory* audio_log_factory)
42 : AudioManagerBase(audio_log_factory) {
43 SetMaxOutputStreamsAllowed(kMaxOutputStreams);
46 AudioManagerCras::~AudioManagerCras() {
50 void AudioManagerCras::ShowAudioInputSettings() {
54 void AudioManagerCras::GetAudioInputDeviceNames(
55 AudioDeviceNames* device_names) {
56 AddDefaultDevice(device_names);
59 void AudioManagerCras::GetAudioOutputDeviceNames(
60 AudioDeviceNames* device_names) {
61 AddDefaultDevice(device_names);
64 AudioParameters AudioManagerCras::GetInputStreamParameters(
65 const std::string& device_id) {
66 static const int kDefaultInputBufferSize = 1024;
67 // TODO(hshi): Fine-tune audio parameters based on |device_id|. The optimal
68 // parameters for the loopback stream may differ from the default.
69 return AudioParameters(
70 AudioParameters::AUDIO_PCM_LOW_LATENCY, CHANNEL_LAYOUT_STEREO,
71 kDefaultSampleRate, 16, kDefaultInputBufferSize);
74 AudioOutputStream* AudioManagerCras::MakeLinearOutputStream(
75 const AudioParameters& params) {
76 DCHECK_EQ(AudioParameters::AUDIO_PCM_LINEAR, params.format());
77 return MakeOutputStream(params);
80 AudioOutputStream* AudioManagerCras::MakeLowLatencyOutputStream(
81 const AudioParameters& params,
82 const std::string& device_id) {
83 DLOG_IF(ERROR, !device_id.empty()) << "Not implemented!";
84 DCHECK_EQ(AudioParameters::AUDIO_PCM_LOW_LATENCY, params.format());
85 // TODO(dgreid): Open the correct input device for unified IO.
86 return MakeOutputStream(params);
89 AudioInputStream* AudioManagerCras::MakeLinearInputStream(
90 const AudioParameters& params, const std::string& device_id) {
91 DCHECK_EQ(AudioParameters::AUDIO_PCM_LINEAR, params.format());
92 return MakeInputStream(params, device_id);
95 AudioInputStream* AudioManagerCras::MakeLowLatencyInputStream(
96 const AudioParameters& params, const std::string& device_id) {
97 DCHECK_EQ(AudioParameters::AUDIO_PCM_LOW_LATENCY, params.format());
98 return MakeInputStream(params, device_id);
101 AudioParameters AudioManagerCras::GetPreferredOutputStreamParameters(
102 const std::string& output_device_id,
103 const AudioParameters& input_params) {
104 // TODO(tommi): Support |output_device_id|.
105 DLOG_IF(ERROR, !output_device_id.empty()) << "Not implemented!";
106 static const int kDefaultOutputBufferSize = 512;
108 ChannelLayout channel_layout = CHANNEL_LAYOUT_STEREO;
109 int sample_rate = kDefaultSampleRate;
110 int buffer_size = kDefaultOutputBufferSize;
111 int bits_per_sample = 16;
112 int input_channels = 0;
113 if (input_params.IsValid()) {
114 sample_rate = input_params.sample_rate();
115 bits_per_sample = input_params.bits_per_sample();
116 channel_layout = input_params.channel_layout();
117 input_channels = input_params.input_channels();
118 buffer_size = input_params.frames_per_buffer();
121 int user_buffer_size = GetUserBufferSize();
122 if (user_buffer_size)
123 buffer_size = user_buffer_size;
125 return AudioParameters(
126 AudioParameters::AUDIO_PCM_LOW_LATENCY, channel_layout, input_channels,
127 sample_rate, bits_per_sample, buffer_size, AudioParameters::NO_EFFECTS);
130 AudioOutputStream* AudioManagerCras::MakeOutputStream(
131 const AudioParameters& params) {
132 return new CrasUnifiedStream(params, this);
135 AudioInputStream* AudioManagerCras::MakeInputStream(
136 const AudioParameters& params, const std::string& device_id) {
137 return new CrasInputStream(params, this, device_id);
140 snd_pcm_format_t AudioManagerCras::BitsToFormat(int bits_per_sample) {
141 switch (bits_per_sample) {
143 return SND_PCM_FORMAT_U8;
145 return SND_PCM_FORMAT_S16;
147 return SND_PCM_FORMAT_S24;
149 return SND_PCM_FORMAT_S32;
151 return SND_PCM_FORMAT_UNKNOWN;