media/audio/cras/audio_manager_cras.cc

   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.
   4
   5 #include "media/audio/cras/audio_manager_cras.h"
   6
   7 #include <algorithm>
   8
   9 #include "base/command_line.h"
  10 #include "base/environment.h"
  11 #include "base/logging.h"
  12 #include "base/nix/xdg_util.h"
  13 #include "base/stl_util.h"
  14 #include "chromeos/audio/audio_device.h"
  15 #include "chromeos/audio/cras_audio_handler.h"
  16 #include "media/audio/cras/cras_input.h"
  17 #include "media/audio/cras/cras_unified.h"
  18 #include "media/base/channel_layout.h"
  19
  20 // cras_util.h headers pull in min/max macros...
  21 // TODO(dgreid): Fix headers such that these aren't imported.
  22 #undef min
  23 #undef max
  24
  25 namespace media {
  26
  27 static void AddDefaultDevice(AudioDeviceNames* device_names) {
  28   DCHECK(device_names->empty());
  29
  30   // Cras will route audio from a proper physical device automatically.
  31   device_names->push_back(
  32       AudioDeviceName(AudioManagerBase::kDefaultDeviceName,
  33                       AudioManagerBase::kDefaultDeviceId));
  34 }
  35
  36 // Maximum number of output streams that can be open simultaneously.
  37 static const int kMaxOutputStreams = 50;
  38
  39 // Default sample rate for input and output streams.
  40 static const int kDefaultSampleRate = 48000;
  41
  42 // Define bounds for the output buffer size.
  43 static const int kMinimumOutputBufferSize = 512;
  44 static const int kMaximumOutputBufferSize = 8192;
  45
  46 // Default input buffer size.
  47 static const int kDefaultInputBufferSize = 1024;
  48
  49 bool AudioManagerCras::HasAudioOutputDevices() {
  50   return true;
  51 }
  52
  53 bool AudioManagerCras::HasAudioInputDevices() {
  54   chromeos::AudioDeviceList devices;
  55   chromeos::CrasAudioHandler::Get()->GetAudioDevices(&devices);
  56   for (size_t i = 0; i < devices.size(); ++i) {
  57     if (devices[i].is_input && devices[i].is_for_simple_usage())
  58       return true;
  59   }
  60   return false;
  61 }
  62
  63 AudioManagerCras::AudioManagerCras(AudioLogFactory* audio_log_factory)
  64     : AudioManagerBase(audio_log_factory),
  65       has_keyboard_mic_(false) {
  66   SetMaxOutputStreamsAllowed(kMaxOutputStreams);
  67 }
  68
  69 AudioManagerCras::~AudioManagerCras() {
  70   Shutdown();
  71 }
  72
  73 void AudioManagerCras::ShowAudioInputSettings() {
  74   NOTIMPLEMENTED();
  75 }
  76
  77 void AudioManagerCras::GetAudioInputDeviceNames(
  78     AudioDeviceNames* device_names) {
  79   AddDefaultDevice(device_names);
  80 }
  81
  82 void AudioManagerCras::GetAudioOutputDeviceNames(
  83     AudioDeviceNames* device_names) {
  84   AddDefaultDevice(device_names);
  85 }
  86
  87 AudioParameters AudioManagerCras::GetInputStreamParameters(
  88     const std::string& device_id) {
  89   DCHECK(GetTaskRunner()->BelongsToCurrentThread());
  90
  91   int user_buffer_size = GetUserBufferSize();
  92   int buffer_size = user_buffer_size ?
  93       user_buffer_size : kDefaultInputBufferSize;
  94   AudioParameters::PlatformEffectsMask effects =
  95       has_keyboard_mic_ ? AudioParameters::KEYBOARD_MIC
  96                         : AudioParameters::NO_EFFECTS;
  97
  98   // TODO(hshi): Fine-tune audio parameters based on |device_id|. The optimal
  99   // parameters for the loopback stream may differ from the default.
 100   AudioParameters params(AudioParameters::AUDIO_PCM_LOW_LATENCY,
 101                          CHANNEL_LAYOUT_STEREO, kDefaultSampleRate, 16,
 102                          buffer_size);
 103   params.set_effects(effects);
 104   return params;
 105 }
 106
 107 void AudioManagerCras::SetHasKeyboardMic() {
 108   DCHECK(GetTaskRunner()->BelongsToCurrentThread());
 109   has_keyboard_mic_ = true;
 110 }
 111
 112 AudioOutputStream* AudioManagerCras::MakeLinearOutputStream(
 113     const AudioParameters& params) {
 114   DCHECK_EQ(AudioParameters::AUDIO_PCM_LINEAR, params.format());
 115   return MakeOutputStream(params);
 116 }
 117
 118 AudioOutputStream* AudioManagerCras::MakeLowLatencyOutputStream(
 119     const AudioParameters& params,
 120     const std::string& device_id) {
 121   DLOG_IF(ERROR, !device_id.empty()) << "Not implemented!";
 122   DCHECK_EQ(AudioParameters::AUDIO_PCM_LOW_LATENCY, params.format());
 123   // TODO(dgreid): Open the correct input device for unified IO.
 124   return MakeOutputStream(params);
 125 }
 126
 127 AudioInputStream* AudioManagerCras::MakeLinearInputStream(
 128     const AudioParameters& params, const std::string& device_id) {
 129   DCHECK_EQ(AudioParameters::AUDIO_PCM_LINEAR, params.format());
 130   return MakeInputStream(params, device_id);
 131 }
 132
 133 AudioInputStream* AudioManagerCras::MakeLowLatencyInputStream(
 134     const AudioParameters& params, const std::string& device_id) {
 135   DCHECK_EQ(AudioParameters::AUDIO_PCM_LOW_LATENCY, params.format());
 136   return MakeInputStream(params, device_id);
 137 }
 138
 139 AudioParameters AudioManagerCras::GetPreferredOutputStreamParameters(
 140     const std::string& output_device_id,
 141     const AudioParameters& input_params) {
 142   // TODO(tommi): Support |output_device_id|.
 143   DLOG_IF(ERROR, !output_device_id.empty()) << "Not implemented!";
 144   ChannelLayout channel_layout = CHANNEL_LAYOUT_STEREO;
 145   int sample_rate = kDefaultSampleRate;
 146   int buffer_size = kMinimumOutputBufferSize;
 147   int bits_per_sample = 16;
 148   if (input_params.IsValid()) {
 149     sample_rate = input_params.sample_rate();
 150     bits_per_sample = input_params.bits_per_sample();
 151     channel_layout = input_params.channel_layout();
 152     buffer_size =
 153         std::min(kMaximumOutputBufferSize,
 154                  std::max(buffer_size, input_params.frames_per_buffer()));
 155   }
 156
 157   int user_buffer_size = GetUserBufferSize();
 158   if (user_buffer_size)
 159     buffer_size = user_buffer_size;
 160
 161   return AudioParameters(AudioParameters::AUDIO_PCM_LOW_LATENCY, channel_layout,
 162                          sample_rate, bits_per_sample, buffer_size);
 163 }
 164
 165 AudioOutputStream* AudioManagerCras::MakeOutputStream(
 166     const AudioParameters& params) {
 167   return new CrasUnifiedStream(params, this);
 168 }
 169
 170 AudioInputStream* AudioManagerCras::MakeInputStream(
 171     const AudioParameters& params, const std::string& device_id) {
 172   return new CrasInputStream(params, this, device_id);
 173 }
 174
 175 snd_pcm_format_t AudioManagerCras::BitsToFormat(int bits_per_sample) {
 176   switch (bits_per_sample) {
 177     case 8:
 178       return SND_PCM_FORMAT_U8;
 179     case 16:
 180       return SND_PCM_FORMAT_S16;
 181     case 24:
 182       return SND_PCM_FORMAT_S24;
 183     case 32:
 184       return SND_PCM_FORMAT_S32;
 185     default:
 186       return SND_PCM_FORMAT_UNKNOWN;
 187   }
 188 }
 189
 190 }  // namespace media