extern "C"
{
#include "libavcodec/avcodec.h"
#include "libavformat/avformat.h"
#include "libswscale/swscale.h"
#include "libavdevice/avdevice.h"
}

//'1' Use Dshow
//'0' Use VFW
#define USE_DSHOW 0

//Show Dshow Device
void show_dshow_device()
{
    AVFormatContext *pFormatCtx = avformat_alloc_context();
    AVDictionary* options = nullptr;
    av_dict_set(&options,"list_devices","true",0);
    AVInputFormat *iformat = av_find_input_format("dshow");
    printf("========Device Info=============\n");
    avformat_open_input(&pFormatCtx,"video=dummy",iformat,&options);
    printf("================================\n");
}

//Show Dshow Device Option
void show_dshow_device_option()
{
    AVFormatContext *pFormatCtx = avformat_alloc_context();
    AVDictionary* options = nullptr;
    av_dict_set(&options,"list_options","true",0);
    AVInputFormat *iformat = av_find_input_format("dshow");
    printf("========Device Option Info======\n");
    avformat_open_input(&pFormatCtx,"video=Integrated Camera",iformat,&options);
    printf("================================\n");
}

//Show VFW Device
void show_vfw_device()
{
    AVFormatContext *pFormatCtx = avformat_alloc_context();
    AVInputFormat *iformat = av_find_input_format("vfwcap");
    printf("========VFW Device Info======\n");
    avformat_open_input(&pFormatCtx,"list",iformat,nullptr);
    printf("=============================\n");
}

//Show AVFoundation Device
void show_avfoundation_device()
{
    AVFormatContext *pFormatCtx = avformat_alloc_context();

    AVDictionary* options = nullptr;
    av_dict_set(&options,"list_devices","true",0);
    AVInputFormat *iformat = av_find_input_format("avfoundation");
    printf("==AVFoundation Device Info===\n");
    avformat_open_input(&pFormatCtx, "",iformat, &options);
    printf("=============================\n");
}

void getDeviceList()
{
    av_register_all();
    avformat_network_init();
    avdevice_register_all();
	
	    //Show Dshow Device
    show_dshow_device();
    //Show Device Options
    show_dshow_device_option();
    //Show VFW Options
    show_vfw_device();
}