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1 #include "stdafx.h"
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2 #include "resource.h"
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3
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4 // Modern multi threading with C++
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5 // Or: how I learned to stop worrying and love the lambdas
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6
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7 #ifdef _WIN32
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8
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9 #include <memory> // shared_ptr
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10 #include <libPPUI/CDialogResizeHelper.h>
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11 #include <helpers/filetimetools.h>
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12 #include <helpers/duration_counter.h>
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13 #include <helpers/atl-misc.h>
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14
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15
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16
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17 namespace { // anon namespace local classes for good measure
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18
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19
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20 class CDemoDialog; // forward declaration
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21
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22 // This is kept a separate shared_ptr'd struct because it may outlive CDemoDialog instance.
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23 struct sharedData_t {
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24 metadb_handle_list items;
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25 CDemoDialog * owner; // weak reference to the owning dialog; can be only used after checking the validity by other means.
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26 };
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27
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28 static const CDialogResizeHelper::Param resizeData[] = {
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29 // Dialog resize handling matrix, defines how the controls scale with the dialog
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30 // L T R B
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31 {IDOK, 1,1,1,1 },
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32 {IDCANCEL, 1,1,1,1 },
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33 {IDC_HEADER, 0,0,1,0 },
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34 {IDC_LIST, 0,0,1,1 },
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35
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36 // current position of a control is determined by initial_position + factor * (current_dialog_size - initial_dialog_size)
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37 // where factor is the value from the table above
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38 // applied to all four values - left, top, right, bottom
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39 // 0,0,0,0 means that a control doesn't react to dialog resizing (aligned to top+left, no resize)
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40 // 1,1,1,1 means that the control is aligned to bottom+right but doesn't resize
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41 // 0,0,1,0 means that the control disregards vertical resize (aligned to top) and changes its width with the dialog
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42 };
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43
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44 // Minimum/maximum size, in dialog box units; see MSDN MapDialogRect for more info about dialog box units.
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45 // The values can be declared constant here and will be scaled appropriately depending on display DPI.
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46 static const CRect resizeMinMax(150, 100, 1000, 1000);
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47
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48 class CDemoDialog : public CDialogImpl<CDemoDialog> {
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49 public:
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50 enum { IDD = IDD_THREADS };
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51 CDemoDialog( metadb_handle_list_cref items ) : m_resizer(resizeData, resizeMinMax) {
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52 m_sharedData = std::make_shared< sharedData_t > ();
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53 m_sharedData->items = items;
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54 m_sharedData->owner = this;
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55 }
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56
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57 BEGIN_MSG_MAP_EX(CDemoDialog)
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58 CHAIN_MSG_MAP_MEMBER(m_resizer)
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59 MSG_WM_INITDIALOG(OnInitDialog)
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60 COMMAND_HANDLER_EX(IDOK, BN_CLICKED, OnOK)
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61 COMMAND_HANDLER_EX(IDCANCEL, BN_CLICKED, OnCancel)
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62 MSG_WM_CLOSE(OnClose)
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63 MSG_WM_DESTROY(OnDestroy)
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64 MSG_WM_SIZE(OnSize)
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65 END_MSG_MAP()
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66 private:
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67 BOOL OnInitDialog(CWindow, LPARAM) {
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68 uSetDlgItemText(*this, IDC_HEADER, PFC_string_formatter() << "Selected: " << m_sharedData->items.get_size() << " tracks." );
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69 m_listBox = GetDlgItem(IDC_LIST);
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70
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71 m_statusBar.Create(*this, NULL, TEXT(""), WS_CHILD | WS_VISIBLE);
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72
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73 m_statusBar.SetWindowText(L"Ready");
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74
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75 ShowWindow(SW_SHOW);
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76
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77 return TRUE; // system should set focus
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78 }
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79 void OnSize(UINT nType, CSize size) {
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80 // Tell statusbar that we got resized. CDialogResizeHelper can't do this for us.
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81 m_statusBar.SendMessage(WM_SIZE);
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82 }
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83 void OnDestroy() {
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84 cancelTask();
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85 }
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86
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87 void OnClose() {
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88 // NOTE if we do not handle WM_CLOSE, WM_COMMAND with IDCANCEL will be invoked, executing our cancel handler.
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89 // We provide our own WM_CLOSE handler to provide a different response to closing the window.
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90 DestroyWindow();
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91 }
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92
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93 void OnCancel(UINT, int, CWindow) {
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94 // If a task is active, cancel it
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95 // otherwise destroy the dialog
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96 if (! cancelTask() ) {
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97 DestroyWindow();
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98 } else {
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99 // Refresh UI
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100 taskCompleted();
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101 }
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102 }
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103 void OnOK(UINT, int, CWindow) {
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104 startTask();
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105 }
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106 void startTask() {
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107 cancelTask(); // cancel any running task
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108
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109 GetDlgItem(IDCANCEL).SetWindowText(L"Cancel");
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110 m_statusBar.SetWindowText(L"Working...");
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111
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112 auto shared = m_sharedData;
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113 auto aborter = std::make_shared<abort_callback_impl>();
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114 m_aborter = aborter;
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115
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116 // New in fb2k 1.4.5: async_task_manager & splitTask
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117 // Use fb2k::splitTask() for starting detached threads.
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118 // In fb2k < 1.4.5, it will fall back to just starting a detached thread.
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119 // fb2k 1.4.5+ async_task_manager cleanly deals with user exiting foobar2000 while a detached async task is running.
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120 // Shutdown of foobar2000 process will be stalled until your task completes.
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121 // If you use other means to ensure that the thread has finished, such as waiting for the thread to exit in your dialog's destructor, there's no need for this.
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122
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123 fb2k::splitTask( [aborter, shared] {
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124 // In worker thread!
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125 try {
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126 work( shared, aborter );
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127 } catch(exception_aborted const &) {
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128 return; // user abort?
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129 } catch(std::exception const & e) {
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130 // should not really get here
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131 logLineProc( shared, aborter, PFC_string_formatter() << "Critical error: " << e);
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132 }
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133 try {
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134 mainThreadOp( aborter, [shared] {
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135 shared->owner->taskCompleted();
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136 } );
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137 } catch(...) {} // mainThreadOp may throw exception_aborted
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138 } );
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139 }
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140 void taskCompleted() {
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141 m_aborter.reset();
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142 GetDlgItem(IDCANCEL).SetWindowText(L"Close");
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143 m_statusBar.SetWindowText(L"Finished, ready");
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144 }
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145
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146 static void mainThreadOp(std::shared_ptr<abort_callback_impl> aborter, std::function<void ()> op ) {
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147 aborter->check(); // are we getting aborted?
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148 fb2k::inMainThread( [=] {
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149 if ( aborter->is_set() ) return; // final user abort check
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150 // Past this, we're main thread, the task has not been cancelled by the user and the dialog is still alive
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151 // and any dialog methods can be safely called
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152 op();
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153 } );
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154 }
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155
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156 static void logLineProc(std::shared_ptr<sharedData_t> shared, std::shared_ptr<abort_callback_impl> aborter, const char * line_ ) {
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157 pfc::string8 line( line_ ); // can't hold to the const char* we got passed, we have no guarantees about its lifetime
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158 mainThreadOp( aborter, [shared, line] {
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159 shared->owner->logLine(line);
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160 } );
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161 }
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162 static void work( std::shared_ptr<sharedData_t> shared, std::shared_ptr<abort_callback_impl> aborter ) {
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163 // clear the log
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164 mainThreadOp(aborter, [shared] {
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165 shared->owner->clearLog();
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166 } );
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167
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168 // A convenience wrapper that calls logLineProc()
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169 auto log = [shared, aborter] ( const char * line ) {
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170 logLineProc(shared, aborter, line);
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171 };
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172 // Use log(X) instead of logLineProc(shared, aborter, X)
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173
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174 for( size_t trackWalk = 0; trackWalk < shared->items.get_size(); ++ trackWalk ) {
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175 aborter->check();
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176 auto track = shared->items[trackWalk];
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177 log( PFC_string_formatter() << "Track: " << track );
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178
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179 try {
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180 const auto path = track->get_path();
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181 const auto subsong = track->get_subsong_index();
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182
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183 // Not strictly needed, but we do it anyway
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184 // Acquire a read lock on the file, so anyone trying to acquire a write lock will just wait till we have finished
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185 auto lock = file_lock_manager::get()->acquire_read(path, *aborter);
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186
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187 {
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188 input_decoder::ptr dec;
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189 input_entry::g_open_for_decoding(dec, nullptr, path, *aborter);
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190
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191 file_info_impl info;
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192 dec->get_info( subsong, info, *aborter );
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193 auto title = info.meta_get("title",0);
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194 if ( title == nullptr ) log("Untitled");
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195 else log(PFC_string_formatter() << "Title: " << title );
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196 if ( info.get_length() > 0 ) log(PFC_string_formatter() << "Duration: " << pfc::format_time_ex(info.get_length(),6) );
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197 auto stats = dec->get_file_stats( *aborter );
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198 if ( stats.m_size != filesize_invalid ) log( PFC_string_formatter() << "Size: " << pfc::format_file_size_short(stats.m_size) );
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199 if ( stats.m_timestamp != filetimestamp_invalid ) log( PFC_string_formatter() << "Last modified: " << format_filetimestamp( stats.m_timestamp ) );
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200
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201
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202 dec->initialize( subsong, input_flag_simpledecode, * aborter );
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203 audio_chunk_impl chunk;
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204 uint64_t numChunks = 0, numSamples = 0;
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205 // duration_counter tool is a strictly accurate audio duration counter retaining all sample counts passed to it, immune to floatingpoint accuracy errors
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206 duration_counter duration;
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207 bool firstChunk = true;
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208 while(dec->run(chunk, *aborter) ) {
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209 if ( firstChunk ) {
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210 auto spec = chunk.get_spec();
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211 log(PFC_string_formatter() << "Audio sample rate: " << spec.sampleRate );
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212 log(PFC_string_formatter() << "Audio channels: " << audio_chunk::g_formatChannelMaskDesc( spec.chanMask ) );
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213 firstChunk = false;
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214 }
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215 ++ numChunks;
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216 duration += chunk;
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217 numSamples += chunk.get_sample_count();
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218 }
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219 log(PFC_string_formatter() << "Decoded " << numChunks << " chunks");
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220 log(PFC_string_formatter() << "Exact duration decoded: " << pfc::format_time_ex(duration.query(), 6) << ", " << numSamples << " samples" );
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221 }
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222
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223 try {
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224 auto aa = album_art_extractor::g_open( nullptr, path, *aborter );
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225
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226 if ( aa->have_entry( album_art_ids::cover_front, *aborter ) ) {
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227 log("Album art: front cover found");
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228 }
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229 if ( aa->have_entry( album_art_ids::cover_back, *aborter ) ) {
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230 log("Album art: back cover found");
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231 }
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232 if (aa->have_entry( album_art_ids::artist, *aborter ) ) {
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233 log("Album art: artist picture found");
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234 }
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235 } catch(exception_album_art_not_found) {
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236 } catch(exception_album_art_unsupported_format) {
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237 }
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238
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239 } catch(exception_aborted) {
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240 throw;
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241 } catch(std::exception const & e) {
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242 log( PFC_string_formatter() << "Failure: " << e);
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243 }
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244 }
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245 log("All done.");
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246 }
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247
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248 bool cancelTask() {
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249 bool ret = false;
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250 auto aborter = pfc::replace_null_t(m_aborter);
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251 if (aborter) {
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252 ret = true;
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253 aborter->set();
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254 logLine("Aborted by user.");
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255 }
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256 return ret;
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257 }
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258
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259 void logLine( const char * line ) {
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260 m_listBox.AddString( pfc::stringcvt::string_os_from_utf8(line) );
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261 }
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262
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263 void clearLog() {
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264 m_listBox.ResetContent();
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265 }
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266
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267
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268 // Worker thread aborter. It's re-created with the thread. If the task is ran more than once, each time it gets a new one.
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269 // A commonly used alternative is to have abort_callback_impl m_aborter, and a blocking cancelTask() that waits for the thread to exit, without all the shared_ptrs and recreation of aborters.
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270 // However that approach will freeze the UI if the worker thread is taking a long time to exit, as well as require some other shared_ptr based means for fb2k::inMainThread() ops to verify that the task is not being aborted / the dialog still exists.
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271 // Therefore we use a shared_ptr'd aborter, which is used both to abort worker threads, and for main thread callbacks to know if the task that sent them is still valid.
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272 std::shared_ptr<abort_callback_impl> m_aborter;
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273
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274 // Data shared with the worker thread. It is created only once per dialog lifetime.
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275 std::shared_ptr< sharedData_t > m_sharedData;
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276
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277 CListBox m_listBox;
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278
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279 CStatusBarCtrl m_statusBar;
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280
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281 CDialogResizeHelper m_resizer;
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282 };
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283 }
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284
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285 void RunUIAndThreads(metadb_handle_list_cref data) {
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286 // Equivalent to new CDemoDialog(data), with modeless registration and auto lifetime
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287 fb2k::newDialog<CDemoDialog>( data );
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288 }
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289
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290 #else
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291
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292 void RunUIAndThreads(metadb_handle_list_cref data) {
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293 popup_message::g_showToast("Not implemented for Mac OS yet");
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294 }
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295
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296 #endif
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