• Cstdlib Dev C 2017
• Stdlib

1. #include <cmath>
2. #include <iostream>
3. #include <string>
4. #include <SDL2/SDL.h>
5. //maybe add timer and cross?
6. //chunks to read in and write to the file
7. constexpr int FRAME_Y =600;
8. constexpr double SUB_FRAME_RATIO =0.8;
9. //the void* to be passed for rendering
10. {
11. volatileint start_index;
12. SDL_Renderer *rend;
13. bool up;
14. int render_callback( Uint32 interval, void*param )
15. struct current_audio_buffer* ab =( current_audio_buffer*)( param );
16. SDL_SetRenderDrawColor(ab->rend, 0x00, 0x00, 0x00, 0xFF);
17. constint divide_scale =(INT32_MAX/(SQ_SIZE * SUB_FRAME_RATIO/2));
18. constint Y_CENTER = FRAME_Y/2;
19. // have color shift over time
20. {
21. }
22. {
23. }
24. ab->green +=(ab->up 1?1:-1);
25. // draw simple grid
26. SDL_SetRenderDrawColor( ab->rend, 0x10,0x10,0x10,0xFF);
27. SDL_RenderDrawLine( ab->rend,
28. X_CENTER, FRAME_Y
29. 0 , Y_CENTER,
30. );
31. SDL_RenderDrawLine( ab->rend,
32. FRAME_X, FRAME_Y
33. 0 , FRAME_Y,
34. );
35. for(int i = ab->start_index; i < ab->start_index + ab->samples_per_frame -2; i+=2)
36. //if ( radius <= 0x20000000 )
37. // SDL_SetRenderDrawColor( ab->rend, 0x00 + radius_m + ab->green / 2, ab->green, 0xFF - radius_m - ab->green / 2, 0xFF );
38. //else
39. //}
40. SDL_SetRenderDrawColor(ab->rend, 0xFF- ab->green, ab->green, 0xFF, 0xFF);
41. SDL_RenderDrawPoint (ab->rend,
42. (-1*(ab->data)[i +1])/(divide_scale)+ Y_CENTER
43. ab->start_index =(ab->start_index + ab->samples_per_frame)&(~1);
44. SDL_RenderPresent(ab->rend);
45. //set the next frame to be rendered in 1000/framerate minus the time we spent here
46. return1000/frame_rate -(SDL_GetTicks()- TICK_START);
47. {
48. bool quit =false;
49. if( argc !=2)
50. std::cerr<<'Usage n'
51. <<'XY Visualize <wav or flac file to visualize>'<< std::endl;
52. }
53. std::string in_name = argv[1];
54. if(in_name.substr( in_name.size()-4, 4)!='.wav'&& in_name.substr( in_name.size()-5, 5)!='.flac')
55. std::cerr<<'Must input wav or flac file!!!'<< std::endl;
56. }
57. SF_INFO info_in [1];
58. SNDFILE* file_in = sf_open(in_name.c_str(),SFM_READ, info_in);
59. buff_size = buff_size +(buff_size % info_in->channels);
60. // in buffer to read in from the file
61. // maybe have a second buffer to read from disc the next bytes asynchoronously?
62. std::unique_ptr<int[]> in_buffer = std::unique_ptr<int[]>(newint[buff_size]);
63. SDL_Init(SDL_INIT_AUDIO SDL_INIT_VIDEO SDL_INIT_TIMER);
64. SDL_AudioDeviceID dev;
65. SDL_Window *window;
66. SDL_Event e;
67. SDL_CreateWindowAndRenderer( FRAME_X,
68. SDL_WINDOW_OPENGL, // SDL_WINDOW_RESIZABLE,
69. &renderer );
70. std::string file_name;
71. int found = in_name.find_last_of('/');
72. {
73. }
74. {
75. }
76. std::string window_name =(std::string)'XY Visualize: '+ file_name;
77. SDL_SetWindowPosition(window, SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED);
78. SDL_memset(&have, 0, sizeof(have));
79. //make the SDL match with the data we have
80. want.format= AUDIO_S32;
81. want.samples= buff_size *sizeof(*(in_buffer.get()));
82. //open device
83. dev = SDL_OpenAudioDevice(NULL, 0, &want, &have, SDL_AUDIO_ALLOW_FORMAT_CHANGE);
84. constint frames_per_buffer_read =(buff_size * frame_rate /(info_in->channels * info_in->samplerate));
85. constint samples_per_frame =((info_in->channels * info_in->samplerate)/ frame_rate);
86. //make struct to pass to callbacks
87. {
88. .start_index=0,
89. .rend= renderer,
90. .up=1
91. SDL_PauseAudioDevice(dev, 0);
92. Uint32 TICK_START = SDL_GetTicks();
93. //read data from queue, and start timers for frame rendering
94. while(int read_in = sf_read_int(file_in, in_buffer.get(), buff_size))
95. if(quit)
96. break;
97. AUDIO_BUFFER.start_index=0;
98. SDL_QueueAudio(dev, in_buffer.get(), sizeof(*(in_buffer.get()))* read_in );
99. SDL_TimerID TID = SDL_AddTimer(static_cast<Uint32>(1000/ frame_rate),
100. (void*)(&AUDIO_BUFFER));
101. SDL_Delay(500* read_in/(info_in->channels * info_in->samplerate)-(SDL_GetTicks()- TICK_START));
102. SDL_PumpEvents();
103. while(SDL_PollEvent(&e))
104. //If user closes the window
105. {
106. }
107. SDL_Delay(1000* read_in /(info_in->channels * info_in->samplerate)-(SDL_GetTicks()- TICK_START));
108. SDL_RemoveTimer(TID);
109. sf_close(file_in);
110. SDL_CloseAudioDevice(dev);
111. SDL_DestroyWindow(window);
112. SDL_Quit();
113. return0;

Header files for the C++ standard library and extensions, by category.

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1. The C cstdlib header file declares a set of general-purpose functions such as: atof to convert string to double. It also contains a few mathematical functions. It also contains a few mathematical functions.
2. Input and Output operations can also be performed in C using the C Standard Input and Output Library (cstdio, known as stdio.h in the C language). This library uses what are called streams to operate with physical devices such as keyboards, printers, terminals or with any other type of files supported by the system.

The function accesses and modifies internal state objects, which may cause data races with concurrent calls to rand or srand. Some libraries provide an alternative function of rand that explicitly avoids this kind of data race: randr (non-portable). C library implementations are allowed to guarantee no data races for calling this function.

¹¹ Added in the C++11 standard.
¹⁴ Added in the C++14 standard.
¹⁷ Added in the C++17 standard.
²⁰ Added in the draft C++20 standard.
^a Deprecated in the C++17 standard.
^b Removed in the draft C++20 standard.
^c Deprecated in the C++98 standard.

Cstdlib Dev C 2017

See also

Stdlib

Using C++ library headers
C++ standard library