fake_audio_manager.cc revision a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7 
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
7namespace media {
8
9namespace {
10
11const int kDefaultInputBufferSize = 1024;
12const int kDefaultSampleRate = 48000;
13
14}  // namespace
15
16FakeAudioManager::FakeAudioManager(AudioLogFactory* audio_log_factory)
17    : AudioManagerBase(audio_log_factory) {}
18
19FakeAudioManager::~FakeAudioManager() {
20  Shutdown();
21}
22
23// Implementation of AudioManager.
24bool FakeAudioManager::HasAudioOutputDevices() { return false; }
25
26bool FakeAudioManager::HasAudioInputDevices() { return false; }
27
28// Implementation of AudioManagerBase.
29AudioOutputStream* FakeAudioManager::MakeLinearOutputStream(
30    const AudioParameters& params) {
31  return FakeAudioOutputStream::MakeFakeStream(this, params);
32}
33
34AudioOutputStream* FakeAudioManager::MakeLowLatencyOutputStream(
35    const AudioParameters& params,
36    const std::string& device_id,
37    const std::string& input_device_id) {
38  return FakeAudioOutputStream::MakeFakeStream(this, params);
39}
40
41AudioInputStream* FakeAudioManager::MakeLinearInputStream(
42    const AudioParameters& params,
43    const std::string& device_id) {
44  return FakeAudioInputStream::MakeFakeStream(this, params);
45}
46
47AudioInputStream* FakeAudioManager::MakeLowLatencyInputStream(
48    const AudioParameters& params,
49    const std::string& device_id) {
50  return FakeAudioInputStream::MakeFakeStream(this, params);
51}
52
53AudioParameters FakeAudioManager::GetPreferredOutputStreamParameters(
54    const std::string& output_device_id,
55    const AudioParameters& input_params) {
56  static const int kDefaultOutputBufferSize = 2048;
57  static const int kDefaultSampleRate = 48000;
58  ChannelLayout channel_layout = CHANNEL_LAYOUT_STEREO;
59  int sample_rate = kDefaultSampleRate;
60  int buffer_size = kDefaultOutputBufferSize;
61  int bits_per_sample = 16;
62  int input_channels = 0;
63  if (input_params.IsValid()) {
64    sample_rate = input_params.sample_rate();
65    bits_per_sample = input_params.bits_per_sample();
66    channel_layout = input_params.channel_layout();
67    input_channels = input_params.input_channels();
68    buffer_size = std::min(input_params.frames_per_buffer(), buffer_size);
69  }
70
71  return AudioParameters(
72      AudioParameters::AUDIO_PCM_LOW_LATENCY, channel_layout, input_channels,
73      sample_rate, bits_per_sample, buffer_size);
74}
75
76AudioParameters FakeAudioManager::GetInputStreamParameters(
77    const std::string& device_id) {
78  return AudioParameters(
79      AudioParameters::AUDIO_PCM_LOW_LATENCY, CHANNEL_LAYOUT_STEREO,
80      kDefaultSampleRate, 16, kDefaultInputBufferSize);
81}
82
83}  // namespace media
84