win api 音频可视化
Posted darkchii
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暂时记录,改天有时间再完善。。。其实写好好久了,但以前的代码丢了,重新写一遍。。
原理和 python 的一样,获取输入设备,然后把数据读取到 buffer 中,在绘制出来。
这里要注意两点:
1. waveformat 结构的参数都要填写正确才能打开设备,wavehdr结构必须先初始化才能调用准备函数,官方文档里都有解释。
2. 读取出来的数据是无符号字符类型(0~255),以及 window 坐标是以左上角为基准,所以,要正确展示波形需要注意下。
// audio_analysis.cpp : 定义应用程序的入口点。 // #include "framework.h" #include "audio_analysis.h" #define MAX_LOADSTRING 100 #define RATE 44100 #define AUBUFF 2048 #define PIPE 2 // 全局变量: HINSTANCE hInst; // 当前实例 WCHAR szTitle[MAX_LOADSTRING]; // 标题栏文本 WCHAR szWindowClass[MAX_LOADSTRING]; // 主窗口类名 WAVEFORMATEX waveformat; WAVEHDR wavehdr; HWAVEOUT hWaveOut; HWAVEIN hWaveIn; HWND hBtn; WCHAR szFilter[] = L"ALL Files (*.*) *.* "; WCHAR szButton[] = L"播放"; BYTE waveBuffer[RATE * PIPE]; BYTE audioData[AUBUFF]; //POINT apt[AUBUFF]; BOOL playing = TRUE; INT audiosum = 0; // 此代码模块中包含的函数的前向声明: ATOM MyRegisterClass(HINSTANCE hInstance); BOOL InitInstance(HINSTANCE, int); LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM); INT_PTR CALLBACK About(HWND, UINT, WPARAM, LPARAM); int APIENTRY wWinMain(_In_ HINSTANCE hInstance, _In_opt_ HINSTANCE hPrevInstance, _In_ LPWSTR lpCmdLine, _In_ int nCmdShow) { UNREFERENCED_PARAMETER(hPrevInstance); UNREFERENCED_PARAMETER(lpCmdLine); // TODO: 在此处放置代码。 // 初始化全局字符串 LoadStringW(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING); LoadStringW(hInstance, IDC_AUDIOANALYSIS, szWindowClass, MAX_LOADSTRING); MyRegisterClass(hInstance); // 执行应用程序初始化: if (!InitInstance (hInstance, nCmdShow)) { return FALSE; } HACCEL hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_AUDIOANALYSIS)); MSG msg; // 主消息循环: while (GetMessage(&msg, nullptr, 0, 0)) { if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg)) { TranslateMessage(&msg); DispatchMessage(&msg); } } return (int) msg.wParam; } // // 函数: MyRegisterClass() // // 目标: 注册窗口类。 // ATOM MyRegisterClass(HINSTANCE hInstance) { WNDCLASSEXW wcex; wcex.cbSize = sizeof(WNDCLASSEX); wcex.style = CS_HREDRAW | CS_VREDRAW; wcex.lpfnWndProc = WndProc; wcex.cbClsExtra = 0; wcex.cbWndExtra = 0; wcex.hInstance = hInstance; wcex.hIcon = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_AUDIOANALYSIS)); wcex.hCursor = LoadCursor(nullptr, IDC_ARROW); wcex.hbrBackground = CreateSolidBrush(RGB(0, 0, 0)); wcex.lpszMenuName = MAKEINTRESOURCEW(IDC_AUDIOANALYSIS); wcex.lpszClassName = szWindowClass; wcex.hIconSm = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL)); return RegisterClassExW(&wcex); } // // 函数: InitInstance(HINSTANCE, int) // // 目标: 保存实例句柄并创建主窗口 // // 注释: // // 在此函数中,我们在全局变量中保存实例句柄并 // 创建和显示主程序窗口。 // BOOL InitInstance(HINSTANCE hInstance, int nCmdShow) { hInst = hInstance; // 将实例句柄存储在全局变量中 HWND hWnd = CreateWindowW(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, nullptr, nullptr, hInstance, nullptr); if (!hWnd) { return FALSE; } ShowWindow(hWnd, nCmdShow); UpdateWindow(hWnd); return TRUE; } // // 函数: WndProc(HWND, UINT, WPARAM, LPARAM) // // 目标: 处理主窗口的消息。 // // WM_COMMAND - 处理应用程序菜单 // WM_PAINT - 绘制主窗口 // WM_DESTROY - 发送退出消息并返回 // // LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) { switch (message) { case WM_CREATE: { HDC hdc = GetDC(hWnd); RECT crect; TEXTMETRIC textMetric; GetTextMetrics(hdc, &textMetric); GetClientRect(hWnd, &crect); int devWidth = crect.right - crect.left; int cxChar = textMetric.tmAveCharWidth, cyChar = textMetric.tmHeight + textMetric.tmExternalLeading; int width = 10 * cxChar, height = 8 * cyChar / 4; hBtn = CreateWindow(TEXT("button"), szButton, WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON, devWidth / 2 - width / 2, cyChar, width, height, hWnd, (HMENU)MAKEINTRESOURCE(IDM_BUTTON), ((LPCREATESTRUCT)lParam)->hInstance, NULL); waveformat.cbSize = 0; waveformat.nAvgBytesPerSec = RATE * 4; waveformat.nBlockAlign = 4; waveformat.nChannels = PIPE; waveformat.nSamplesPerSec = RATE; waveformat.wBitsPerSample = 16; waveformat.wFormatTag = WAVE_FORMAT_PCM; UINT rst = waveInOpen(&hWaveIn, WAVE_MAPPER, &waveformat, (DWORD)hWnd, 0, CALLBACK_WINDOW); if (rst != MMSYSERR_NOERROR) { MessageBox(hWnd, L"Could not find suitable input device", L"Error Message", MB_ICONSTOP | MB_OK); DestroyWindow(hWnd); break; } } break; case WM_COMMAND: { int wmId = LOWORD(wParam); // 分析菜单选择: switch (wmId) { case IDM_OPEN: { OPENFILENAME ofn; WCHAR szFile[MAX_PATH]; ZeroMemory(&ofn, sizeof(ofn)); ofn.hwndOwner = hWnd; ofn.lStructSize = sizeof(ofn); ofn.lpstrFilter = szFilter; ofn.nMaxFile = _MAX_PATH; ofn.lpstrFile = szFile; ofn.lpstrFile[0] = ‘ ‘; ofn.nFilterIndex = 1; ofn.lpstrFileTitle = NULL; ofn.nMaxFileTitle = 0; ofn.lpstrInitialDir = NULL; ofn.Flags = OFN_PATHMUSTEXIST | OFN_FILEMUSTEXIST; if (GetOpenFileName(&ofn) == TRUE) { WCHAR wComd[MAX_PATH]; _stprintf_s(wComd, TEXT("open cdaudio!%s"), szFile); mciSendString(wComd, NULL, 0, 0); _stprintf_s(wComd, TEXT("play cdaudio!%s"), szFile); mciSendString(wComd, NULL, 0, 0); } else { MessageBoxW(NULL, TEXT("打开文件失败"), TEXT("错误"), MB_OK); } } break; case IDM_BUTTON: { if (playing == TRUE) { playing = FALSE; waveInStop(hWaveIn); SetWindowText(hBtn, TEXT("播放")); } else { playing = TRUE; waveInStart(hWaveIn); SetWindowText(hBtn, TEXT("暂停")); } } break; case IDM_ABOUT: DialogBox(hInst, MAKEINTRESOURCE(IDD_ABOUTBOX), hWnd, About); break; case IDM_EXIT: DestroyWindow(hWnd); break; default: return DefWindowProc(hWnd, message, wParam, lParam); } } break; case WM_PAINT: { PAINTSTRUCT ps; HDC hdc = BeginPaint(hWnd, &ps); RECT rect; GetClientRect(hWnd, &rect); int width = rect.right - rect.left; HGDIOBJ hPen = SelectObject(hdc, GetStockObject(DC_PEN)); SetDCPenColor(hdc, RGB(0, 245, 0)); for (int i = 0; i < width - 1; i++) { MoveToEx(hdc, i, (signed char)audioData[i] + 256, NULL); LineTo(hdc, i + 1, (signed char)audioData[i + 1] + 256); } SelectObject(hdc, hPen); DeleteObject(hPen); EndPaint(hWnd, &ps); } break; case MM_WIM_OPEN: { ZeroMemory(&wavehdr, sizeof(wavehdr)); ZeroMemory(waveBuffer, sizeof(waveBuffer)); wavehdr.lpData = (LPSTR)waveBuffer; wavehdr.dwBufferLength = sizeof(waveBuffer); wavehdr.dwFlags = 0; wavehdr.dwLoops = 0; wavehdr.dwUser = 0; if (waveInPrepareHeader(hWaveIn, &wavehdr, sizeof(wavehdr)) != MMSYSERR_NOERROR) { MessageBox(hWnd, L"Could not prepare wave header", L"Warning Message", MB_ICONWARNING | MB_OK); waveInClose(hWaveIn); break; } if (waveInStart(hWaveIn) != MMSYSERR_NOERROR) { MessageBox(hWnd, L"Could not start input device", L"Warning Message", MB_ICONWARNING | MB_OK); waveInClose(hWaveIn); break; } if (waveInAddBuffer(hWaveIn, &wavehdr, sizeof(wavehdr)) != MMSYSERR_NOERROR) { MessageBox(hWnd, L"Could not add buffer", L"Warning Message", MB_ICONWARNING | MB_OK); waveInClose(hWaveIn); break; } SetWindowText(hBtn, TEXT("暂停")); } break; case MM_WIM_DATA: { RECT rect; GetClientRect(hWnd, &rect); int width = rect.right - rect.left; for (int i = 0; i < width; i++) audioData[i] = wavehdr.lpData[i + audioSum]; audioSum += 240; RedrawWindow(hWnd, NULL, NULL, RDW_INVALIDATE); HBRUSH wb = (HBRUSH)GetStockObject(BLACK_BRUSH); RECT r = rect; HDC hdc = GetDC(hWnd); r.top += 56; FillRect(hdc, &r, wb); ReleaseDC(hWnd, hdc); if (audioSum > RATE * PIPE) { audioSum = 0; ZeroMemory(waveBuffer, sizeof(waveBuffer)); } waveInAddBuffer(hWaveIn, &wavehdr, sizeof(wavehdr)); } break; case MM_WIM_CLOSE: { playing = FALSE; } break; case WM_DESTROY: { if (playing) { waveInStop(hWaveIn); waveInClose(hWaveIn); } PostQuitMessage(0); } break; default: return DefWindowProc(hWnd, message, wParam, lParam); } return 0; } // “关于”框的消息处理程序。 INT_PTR CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam) { UNREFERENCED_PARAMETER(lParam); switch (message) { case WM_INITDIALOG: return (INT_PTR)TRUE; case WM_COMMAND: if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL) { EndDialog(hDlg, LOWORD(wParam)); return (INT_PTR)TRUE; } break; } return (INT_PTR)FALSE; }
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