DirectShow 获取音视频输入设备列表

开发环境:Win10 + VS2015

本文介绍一个 "获取音频视频输入设备列表" 的示例代码。


效果图


代码下载

代码下载(VC2015):Github - DShow_simpleVideo


实现代码

DS_GetAudioVideoInputDevices.h

/* ----------------------------------------------------------
文件名称:DS_AudioVideoDevices.h

功能描述:
获取音频视频输入设备列表

接口函数:
DS_GetAudioVideoInputDevices
------------------------------------------------------------ */
#pragma once

#include <windows.h>
#include <vector>
#include <dshow.h>

#ifndef MACRO_GROUP_DEVICENAME
#define MACRO_GROUP_DEVICENAME

#define MAX_FRIENDLY_NAME_LENGTH	128
#define MAX_MONIKER_NAME_LENGTH		256

typedef struct _TDeviceName
{
	WCHAR FriendlyName[MAX_FRIENDLY_NAME_LENGTH];	// 设备友好名
	WCHAR MonikerName[MAX_MONIKER_NAME_LENGTH];		// 设备Moniker名
} TDeviceName;
#endif

#ifdef __cplusplus
extern "C"
{
#endif

	/*
	功能:获取音视频输入设备列表
	参数说明:
	vectorDevices:用于存储返回的设备友好名及Moniker名
	guidValue:
	CLSID_AudioInputDeviceCategory:获取音频输入设备列表
	CLSID_VideoInputDeviceCategory:获取视频输入设备列表
	返回值:
	错误代码
	说明:
	基于DirectShow
	列表中的第一个设备为系统缺省设备
	capGetDriverDescription只能获得设备驱动名
	*/
	HRESULT DS_GetAudioVideoInputDevices(std::vector<TDeviceName> &vectorDevices, REFGUID guidValue);

#ifdef __cplusplus
}
#endif

DS_GetAudioVideoInputDevices.cpp

#include "stdafx.h"
#include "DS_AudioVideoDevices.h"

// 用到的DirectShow SDK链接库
#pragma comment(lib, "Strmiids.lib")

// 获取音视频输入设备列表
HRESULT DS_GetAudioVideoInputDevices(std::vector<TDeviceName> &vectorDevices, REFGUID guidValue)
{
	TDeviceName name;
	HRESULT hr;

	// 初始化vector
	vectorDevices.clear();

	// 初始化COM
	hr = CoInitializeEx(NULL, COINIT_APARTMENTTHREADED);
	if (FAILED(hr))
	{
		return hr;
	}

	// 创建系统设备枚举器实例
	ICreateDevEnum *pSysDevEnum = NULL;
	hr = CoCreateInstance(CLSID_SystemDeviceEnum, NULL, CLSCTX_INPROC_SERVER, IID_ICreateDevEnum, (void **)&pSysDevEnum);
	if (FAILED(hr))
	{
		CoUninitialize();
		return hr;
	}

	// 获取设备类枚举器
	IEnumMoniker *pEnumCat = NULL;
	hr = pSysDevEnum->CreateClassEnumerator(guidValue, &pEnumCat, 0);
	if (hr == S_OK)
	{
		// 枚举设备名称
		IMoniker *pMoniker = NULL;
		ULONG cFetched;
		while (pEnumCat->Next(1, &pMoniker, &cFetched) == S_OK)
		{
			IPropertyBag *pPropBag;
			hr = pMoniker->BindToStorage(NULL, NULL, IID_IPropertyBag, (void **)&pPropBag);
			if (SUCCEEDED(hr))
			{				
				VARIANT varName;
				VariantInit(&varName);

				// 获取设备友好名
				hr = pPropBag->Read(L"FriendlyName", &varName, NULL);
				if (SUCCEEDED(hr))
				{
					// 拷贝设备友好名到name.FriendlyName
					StringCchCopy(name.FriendlyName, MAX_FRIENDLY_NAME_LENGTH, varName.bstrVal);

					// 获取设备Moniker名
					LPOLESTR pOleDisplayName = reinterpret_cast<LPOLESTR>(CoTaskMemAlloc(MAX_MONIKER_NAME_LENGTH * 2));
					if (pOleDisplayName != NULL)
					{
						hr = pMoniker->GetDisplayName(NULL, NULL, &pOleDisplayName);
						if (SUCCEEDED(hr))
						{
							// 拷贝设备Moniker名到name.MonikerName
							StringCchCopy(name.MonikerName, MAX_MONIKER_NAME_LENGTH, pOleDisplayName);
							vectorDevices.push_back(name);
						}

						CoTaskMemFree(pOleDisplayName);
					}
				}

				VariantClear(&varName);
				pPropBag->Release();
			}

			pMoniker->Release();
		} // End for While

		pEnumCat->Release();
	}

	pSysDevEnum->Release();
	CoUninitialize();

	return hr;
}

DShow_getVideoDevices.cpp

#include "stdafx.h"
#include <iostream>
#include <vector>
#include <dshow.h>
#include "DS_AudioVideoDevices.h"

// 用到的DirectShow SDK链接库
#pragma comment(lib,"strmiids.lib")

int _tmain(int argc, _TCHAR* argv[])
{
	std::vector<TDeviceName> vectorDevices;

	// 获取音视频输入设备列表
	DS_GetAudioVideoInputDevices(vectorDevices, CLSID_VideoInputDeviceCategory);

	// 打印"设备友好名"和"设备Moniker名"(摄像头)
	for (unsigned int i = 0; i < vectorDevices.size(); i++)
		std::wcout << vectorDevices[i].FriendlyName << " | " << vectorDevices[i].MonikerName << std::endl;

	return 0;
}

参考:

基于DirectShow获取音频视频输入设备列表

DirectShow 视频采集

1.使用DShow获取本机的视音频设备和自带编解码器列表


posted @ 2019-12-18 11:00  fengMisaka  阅读(1336)  评论(0编辑  收藏  举报