rs-latency-tool : out of range value for argument "index" when using USB CAM

[patrickpoirier51]

Required Info
Camera Model	{LOGITECH C920 }
Firmware Version	N/A
Operating System & Version	UBUNTU 18
Kernel Version (Linux Only)	Linux nvidia-nano 4.9.140-tegra
Platform	NVIDIA Jetson NANO
SDK Version	{ 2.2.3 }
Language	{C}
Segment	N/A

Issue Description

<Describe your issue / question / feature request / etc..> rs-latency-tool : out of range value for argument "index" when using USB CAM (Logitech C920) : HD Pro Webcam C920 as /devices/70090000.xusb/usb1/1-2/1-2.1/1-2.1:1.0/input/input3 ls /dev/vid* /dev/video0

Error Message: rs-latency-tool RealSense error calling rs2_create_device(info_list:0x557111e5f0, index:0): out of range value for argument "index"

Modified rs-latency-tool.cpp according to wiki // Start RealSense camera // Uncomment the configuration you wish to test //pipeline pipe; //config cfg; //cfg.enable_stream(RS2_STREAM_COLOR, RS2_FORMAT_BGR8); //cfg.enable_stream(RS2_STREAM_COLOR, 640, 480, RS2_FORMAT_BGR8, 30); //cfg.enable_stream(RS2_STREAM_COLOR, 1920, 1080, RS2_FORMAT_BGR8, 30); //cfg.enable_stream(RS2_STREAM_INFRARED, 640, 480, RS2_FORMAT_Y8); //cfg.enable_stream(RS2_STREAM_INFRARED, 1280, 720, RS2_FORMAT_Y8); //pipe.start(cfg);

// To test with a regular webcam, comment-out the previous block
// And uncomment the following code:
context ctx;
auto dev = ctx.query_devices().front();
auto sensor = dev.query_sensors().front();
auto sps = sensor.get_stream_profiles();
stream_profile selected;
for (auto& sp : sps)
{
    if (auto vid = sp.as<video_stream_profile>())
    {
        if (vid.format() == RS2_FORMAT_BGR8 &&
            vid.width() == 640 && vid.height() == 480 &&
            vid.fps() == 30)
            selected = vid;
    }
}
sensor.open(selected);
syncer pipe;
sensor.start(pipe);

[dorodnic]

I think by default query_devices does not return non-RealSense devices, but there is a flag you can pass it to get these.

[patrickpoirier51]

OK it works, I inserted the RS2_PRODUCT_LINE_NON_INTEL flag and added a camera detection for conviviality :-)

// And uncomment the following code:
context ctx;
auto list = ctx.query_devices(RS2_PRODUCT_LINE_NON_INTEL);
if (list.size() == 0) 
    throw std::runtime_error("No device detected. Is it plugged in?");
auto dev = list.front();

Thanks, Please update wiki & code