// License: Apache 2.0. See LICENSE file in root directory.
// Copyright(c) 2015-2017 Intel Corporation. All Rights Reserved.

#include <librealsense2/rs.hpp>     // Include RealSense Cross Platform API
#include "example.hpp"              // Include short list of convenience functions for rendering

#include <map>
#include <vector>

int main(int argc, char * argv[]) try
{
    // Create a simple OpenGL window for rendering:
    window app(1280, 960, "CPP Multi-Camera Example");

    rs2::context                          ctx;        // Create librealsense context for managing devices

    std::map<std::string, rs2::colorizer> colorizers; // Declare map from device serial number to colorizer (utility class to convert depth data RGB colorspace)

    std::vector<rs2::pipeline>            pipelines;

    // Start a streaming pipe per each connected device
    for (auto&& dev : ctx.query_devices())
    {
        rs2::pipeline pipe(ctx);
        rs2::config cfg;
        cfg.enable_device(dev.get_info(RS2_CAMERA_INFO_SERIAL_NUMBER));
        pipe.start(cfg);
        pipelines.emplace_back(pipe);
        // Map from each device's serial number to a different colorizer
        colorizers[dev.get_info(RS2_CAMERA_INFO_SERIAL_NUMBER)] = rs2::colorizer();
    }

    // We'll keep track of the last frame of each stream available to make the presentation persistent
    std::map<int, rs2::frame> render_frames;

    // Main app loop
    while (app)
    {
        // Collect the new frames from all the connected devices
        std::vector<rs2::frame> new_frames;
        for (auto &&pipe : pipelines)
        {
            rs2::frameset fs;
            if (pipe.poll_for_frames(&fs))
            {
                for (const rs2::frame& f : fs)
                    new_frames.emplace_back(f);
            }
        }

        // Convert the newly-arrived frames to render-friendly format
        for (const auto& frame : new_frames)
        {
            // Get the serial number of the current frame's device
            auto serial = rs2::sensor_from_frame(frame)->get_info(RS2_CAMERA_INFO_SERIAL_NUMBER);
            // Apply the colorizer of the matching device and store the colorized frame
            render_frames[frame.get_profile().unique_id()] = colorizers[serial].process(frame);
        }

        // Present all the collected frames with openGl mosaic
        app.show(render_frames);
    }

    return EXIT_SUCCESS;
}
catch (const rs2::error & e)
{
    std::cerr << "RealSense error calling " << e.get_failed_function() << "(" << e.get_failed_args() << "):\n    " << e.what() << std::endl;
    return EXIT_FAILURE;
}
catch (const std::exception & e)
{
    std::cerr << e.what() << std::endl;
    return EXIT_FAILURE;
}

 这是realsens source 中的代码。

关于配置可参考：https://blog.csdn.net/hanshuning/article/details/100972596

关于realsense多相机使用方法和注意事项可参考https://download.csdn.net/download/hanshuning/13820091