media/audio/fake_audio_manager.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/fake_audio_manager.h"
   6
   7 namespace media {
   8
   9 namespace {
  10
  11 const int kDefaultInputBufferSize = 1024;
  12 const int kDefaultSampleRate = 48000;
  13
  14 }  // namespace
  15
  16 FakeAudioManager::FakeAudioManager(AudioLogFactory* audio_log_factory)
  17     : AudioManagerBase(audio_log_factory) {}
  18
  19 FakeAudioManager::~FakeAudioManager() {
  20   Shutdown();
  21 }
  22
  23 // Implementation of AudioManager.
  24 bool FakeAudioManager::HasAudioOutputDevices() { return false; }
  25
  26 bool FakeAudioManager::HasAudioInputDevices() { return false; }
  27
  28 // Implementation of AudioManagerBase.
  29 AudioOutputStream* FakeAudioManager::MakeLinearOutputStream(
  30     const AudioParameters& params) {
  31   return FakeAudioOutputStream::MakeFakeStream(this, params);
  32 }
  33
  34 AudioOutputStream* FakeAudioManager::MakeLowLatencyOutputStream(
  35     const AudioParameters& params,
  36     const std::string& device_id) {
  37   return FakeAudioOutputStream::MakeFakeStream(this, params);
  38 }
  39
  40 AudioInputStream* FakeAudioManager::MakeLinearInputStream(
  41     const AudioParameters& params,
  42     const std::string& device_id) {
  43   return FakeAudioInputStream::MakeFakeStream(this, params);
  44 }
  45
  46 AudioInputStream* FakeAudioManager::MakeLowLatencyInputStream(
  47     const AudioParameters& params,
  48     const std::string& device_id) {
  49   return FakeAudioInputStream::MakeFakeStream(this, params);
  50 }
  51
  52 AudioParameters FakeAudioManager::GetPreferredOutputStreamParameters(
  53     const std::string& output_device_id,
  54     const AudioParameters& input_params) {
  55   static const int kDefaultOutputBufferSize = 2048;
  56   static const int kDefaultSampleRate = 48000;
  57   ChannelLayout channel_layout = CHANNEL_LAYOUT_STEREO;
  58   int sample_rate = kDefaultSampleRate;
  59   int buffer_size = kDefaultOutputBufferSize;
  60   int bits_per_sample = 16;
  61   if (input_params.IsValid()) {
  62     sample_rate = input_params.sample_rate();
  63     bits_per_sample = input_params.bits_per_sample();
  64     channel_layout = input_params.channel_layout();
  65     buffer_size = std::min(input_params.frames_per_buffer(), buffer_size);
  66   }
  67
  68   return AudioParameters(AudioParameters::AUDIO_PCM_LOW_LATENCY, channel_layout,
  69                          sample_rate, bits_per_sample, buffer_size);
  70 }
  71
  72 AudioParameters FakeAudioManager::GetInputStreamParameters(
  73     const std::string& device_id) {
  74   return AudioParameters(
  75       AudioParameters::AUDIO_PCM_LOW_LATENCY, CHANNEL_LAYOUT_STEREO,
  76       kDefaultSampleRate, 16, kDefaultInputBufferSize);
  77 }
  78
  79 }  // namespace media