win api 音频可视化
2024-10-08 11:58:17
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。
做了一些修改：
#include "framework.h"
#include "audio_analysis.h" #define MAX_LOADSTRING 100
#define RATE 44100
#define AUBUFF 2048
#define PIPE 2 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 (*.*)\0*.*\0\0";
WCHAR szButton[] = L"播放";
BYTE waveBuffer[RATE * PIPE];
signed char audioData[AUBUFF];
BOOL playing = TRUE;
INT audioSum = 0; 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;
} 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);
} 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;
} LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message)
{
case WM_CREATE:
{
HDC hdc = GetDC(hWnd);
RECT rect;
TEXTMETRIC textMetric; GetTextMetrics(hdc, &textMetric);
GetClientRect(hWnd, &rect); int rWidth = rect.right - rect.left,
cxChar = textMetric.tmAveCharWidth,
cyChar = textMetric.tmHeight + textMetric.tmExternalLeading,
bWidth = 10 * cxChar,
bHeight = 8 * cyChar / 4; hBtn = CreateWindow(TEXT("button"), szButton,
WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON,
rWidth / 2 - bWidth / 2, cyChar, bWidth, bHeight,
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);
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] = '\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;
TEXTMETRIC textMetric; GetTextMetrics(hdc, &textMetric);
GetClientRect(hWnd, &rect); int rWidth = rect.right - rect.left,
rHeight = rect.bottom - rect.top,
cxChar = textMetric.tmAveCharWidth,
cyChar = textMetric.tmHeight + textMetric.tmExternalLeading,
bWidth = 10 * cxChar,
bHeight = 8 * cyChar / 4,
waveAxis = rHeight / 2; SetWindowPos(hBtn, HWND_TOP, rWidth / 2 - bWidth / 2,
cyChar, bWidth, bHeight, SWP_SHOWWINDOW | SWP_NOREDRAW);
HGDIOBJ hPen = SelectObject(hdc, GetStockObject(DC_PEN));
SetDCPenColor(hdc, RGB(0, 245, 0));
for (int i = 0; i < rWidth - 1; i++)
{
MoveToEx(hdc, 1 + 4 * i, audioData[i] + waveAxis, NULL);
LineTo(hdc, 1 + 4 * (i + 1), audioData[i + 1] + waveAxis);
}
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 += 4; 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;
} 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;
}
截图：
原截图：
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