CODEWITHSUNDEEP
c++windowsffmpegdirectshow
fyo
fyo

Reputation: 77

How to get DirectShow device list with ffmpeg in c++?

I'm trying to get dshow device list with ffmpeg. I cannot get it but ffmpeg gets it by its own. Here is the code. It returns AVERROR(ENOSYS) for avdevice_list_input_sources. But avformat_open_input prints all devices. How can I get dshow devices and options in c++ code.

    avdevice_register_all();
    AVInputFormat *iformat = av_find_input_format("dshow");
    printf("========Device Info=============\n");
    AVDeviceInfoList *device_list = NULL;
    AVDictionary* options = NULL;
    //av_dict_set(&options, "list_devices", "true", 0);
    int result = avdevice_list_input_sources(iformat, NULL, options, &device_list);

    if (result < 0)
        printf("Error Code:%s\n", av_err2str(result));//Returns -40 AVERROR(ENOSYS)
    else printf("Devices count:%d\n", result);

    AVFormatContext *pFormatCtx = avformat_alloc_context();
    AVDictionary* options2 = NULL;
    av_dict_set(&options2, "list_devices", "true", 0);
    avformat_open_input(&pFormatCtx, NULL, iformat, &options2);
    printf("================================\n");

Upvotes: 1

Views: 4634

Answers (1)

rogerdpack
rogerdpack

Reputation: 66741

"We" haven't plumbed libav to return the device list yet. So it's either parse the output of ffmpeg.exe -f dshow -list_devices true -i dummy or enumerate them yourself using dshow api's:

https://trac.ffmpeg.org/wiki/DirectShow#Howtoprogrammaticallyenumeratedevices

Upvotes: 2

Related Questions