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