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   return AudioParameters(
 101       AudioParameters::AUDIO_PCM_LOW_LATENCY, CHANNEL_LAYOUT_STEREO,
 102       kDefaultSampleRate, 16, buffer_size, effects);
 103 }
 104
 105 void AudioManagerCras::SetHasKeyboardMic() {
 106   DCHECK(GetTaskRunner()->BelongsToCurrentThread());
 107   has_keyboard_mic_ = true;
 108 }
 109
 110 AudioOutputStream* AudioManagerCras::MakeLinearOutputStream(
 111     const AudioParameters& params) {
 112   DCHECK_EQ(AudioParameters::AUDIO_PCM_LINEAR, params.format());
 113   return MakeOutputStream(params);
 114 }
 115
 116 AudioOutputStream* AudioManagerCras::MakeLowLatencyOutputStream(
 117     const AudioParameters& params,
 118     const std::string& device_id) {
 119   DLOG_IF(ERROR, !device_id.empty()) << "Not implemented!";
 120   DCHECK_EQ(AudioParameters::AUDIO_PCM_LOW_LATENCY, params.format());
 121   // TODO(dgreid): Open the correct input device for unified IO.
 122   return MakeOutputStream(params);
 123 }
 124
 125 AudioInputStream* AudioManagerCras::MakeLinearInputStream(
 126     const AudioParameters& params, const std::string& device_id) {
 127   DCHECK_EQ(AudioParameters::AUDIO_PCM_LINEAR, params.format());
 128   return MakeInputStream(params, device_id);
 129 }
 130
 131 AudioInputStream* AudioManagerCras::MakeLowLatencyInputStream(
 132     const AudioParameters& params, const std::string& device_id) {
 133   DCHECK_EQ(AudioParameters::AUDIO_PCM_LOW_LATENCY, params.format());
 134   return MakeInputStream(params, device_id);
 135 }
 136
 137 AudioParameters AudioManagerCras::GetPreferredOutputStreamParameters(
 138     const std::string& output_device_id,
 139     const AudioParameters& input_params) {
 140   // TODO(tommi): Support |output_device_id|.
 141   DLOG_IF(ERROR, !output_device_id.empty()) << "Not implemented!";
 142   ChannelLayout channel_layout = CHANNEL_LAYOUT_STEREO;
 143   int sample_rate = kDefaultSampleRate;
 144   int buffer_size = kMinimumOutputBufferSize;
 145   int bits_per_sample = 16;
 146   if (input_params.IsValid()) {
 147     sample_rate = input_params.sample_rate();
 148     bits_per_sample = input_params.bits_per_sample();
 149     channel_layout = input_params.channel_layout();
 150     buffer_size =
 151         std::min(kMaximumOutputBufferSize,
 152                  std::max(buffer_size, input_params.frames_per_buffer()));
 153   }
 154
 155   int user_buffer_size = GetUserBufferSize();
 156   if (user_buffer_size)
 157     buffer_size = user_buffer_size;
 158
 159   return AudioParameters(
 160       AudioParameters::AUDIO_PCM_LOW_LATENCY, channel_layout,
 161       sample_rate, bits_per_sample, buffer_size, AudioParameters::NO_EFFECTS);
 162 }
 163
 164 AudioOutputStream* AudioManagerCras::MakeOutputStream(
 165     const AudioParameters& params) {
 166   return new CrasUnifiedStream(params, this);
 167 }
 168
 169 AudioInputStream* AudioManagerCras::MakeInputStream(
 170     const AudioParameters& params, const std::string& device_id) {
 171   return new CrasInputStream(params, this, device_id);
 172 }
 173
 174 snd_pcm_format_t AudioManagerCras::BitsToFormat(int bits_per_sample) {
 175   switch (bits_per_sample) {
 176     case 8:
 177       return SND_PCM_FORMAT_U8;
 178     case 16:
 179       return SND_PCM_FORMAT_S16;
 180     case 24:
 181       return SND_PCM_FORMAT_S24;
 182     case 32:
 183       return SND_PCM_FORMAT_S32;
 184     default:
 185       return SND_PCM_FORMAT_UNKNOWN;
 186   }
 187 }
 188
 189 }  // namespace media