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node_implementation.cpp
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#include "node_implementation.h"
#include <boost/range/adaptor/filtered.hpp>
#include <boost/range/adaptor/transformed.hpp>
#include <boost/range/algorithm/find.hpp>
#include <boost/range/algorithm/find_first_of.hpp>
#include <boost/range/algorithm/find_if.hpp>
#include <boost/range/algorithm_ext/push_back.hpp>
#include <boost/range/irange.hpp>
#include <boost/range/join.hpp>
#include "pplx/pplx_utils.h" // for pplx::complete_after, etc.
#include "cpprest/host_utils.h"
#ifdef HAVE_LLDP
#include "lldp/lldp_manager.h"
#endif
#include "nmos/activation_mode.h"
#include "nmos/capabilities.h"
#include "nmos/channels.h"
#include "nmos/channelmapping_resources.h"
#include "nmos/clock_name.h"
#include "nmos/colorspace.h"
#include "nmos/connection_resources.h"
#include "nmos/connection_events_activation.h"
#include "nmos/control_protocol_resources.h"
#include "nmos/control_protocol_resource.h"
#include "nmos/control_protocol_state.h"
#include "nmos/control_protocol_utils.h"
#include "nmos/events_resources.h"
#include "nmos/format.h"
#include "nmos/group_hint.h"
#include "nmos/interlace_mode.h"
#include "nmos/is12_versions.h" // for IS-12 gain control
#ifdef HAVE_LLDP
#include "nmos/lldp_manager.h"
#endif
#include "nmos/media_type.h"
#include "nmos/model.h"
#include "nmos/node_interfaces.h"
#include "nmos/node_resource.h"
#include "nmos/node_resources.h"
#include "nmos/node_server.h"
#include "nmos/random.h"
#include "nmos/sdp_utils.h"
#include "nmos/slog.h"
#include "nmos/st2110_21_sender_type.h"
#include "nmos/system_resources.h"
#include "nmos/transfer_characteristic.h"
#include "nmos/transport.h"
#include "nmos/video_jxsv.h"
#include "sdp/sdp.h"
// example node implementation details
namespace impl
{
// custom logging category for the example node implementation thread
namespace categories
{
const nmos::category node_implementation{ "node_implementation" };
}
// custom settings for the example node implementation
namespace fields
{
// node_tags, device_tags: used in resource tags fields
// "Each tag has a single key, but MAY have multiple values."
// See https://specs.amwa.tv/is-04/releases/v1.3.2/docs/APIs_-_Common_Keys.html#tags
// {
// "tag_1": [ "tag_1_value_1", "tag_1_value_2" ],
// "tag_2": [ "tag_2_value_1" ]
// }
const web::json::field_as_value_or node_tags{ U("node_tags"), web::json::value::object() };
const web::json::field_as_value_or device_tags{ U("device_tags"), web::json::value::object() };
// how_many: provides for very basic testing of a node with many sub-resources of each type
const web::json::field_as_integer_or how_many{ U("how_many"), 1 };
// activate_senders: controls whether to activate senders on start up (true, default) or not (false)
const web::json::field_as_bool_or activate_senders{ U("activate_senders"), true };
// senders, receivers: controls which kinds of sender and receiver are instantiated by the example node
// the values must be an array of unique strings identifying the kinds of 'port', like ["v", "a", "d"], see impl::ports
// when omitted, all ports are instantiated
const web::json::field_as_value_or senders{ U("senders"), {} };
const web::json::field_as_value_or receivers{ U("receivers"), {} };
// frame_rate: controls the grain_rate of video, audio and ancillary data sources and flows
// and the equivalent parameter constraint on video receivers
// the value must be an object like { "numerator": 25, "denominator": 1 }
// hm, unfortunately can't use nmos::make_rational(nmos::rates::rate25) during static initialization
const web::json::field_as_value_or frame_rate{ U("frame_rate"), web::json::value_of({
{ nmos::fields::numerator, 25 },
{ nmos::fields::denominator, 1 }
}) };
// frame_width, frame_height: control the frame_width and frame_height of video flows
const web::json::field_as_integer_or frame_width{ U("frame_width"), 1920 };
const web::json::field_as_integer_or frame_height{ U("frame_height"), 1080 };
// interlace_mode: controls the interlace_mode of video flows, see nmos::interlace_mode
// when omitted, a default of "progressive" or "interlaced_tff" is used based on the frame_rate, etc.
const web::json::field_as_string interlace_mode{ U("interlace_mode") };
// colorspace: controls the colorspace of video flows, see nmos::colorspace
const web::json::field_as_string_or colorspace{ U("colorspace"), U("BT709") };
// transfer_characteristic: controls the transfer characteristic system of video flows, see nmos::transfer_characteristic
const web::json::field_as_string_or transfer_characteristic{ U("transfer_characteristic"), U("SDR") };
// color_sampling: controls the color (sub-)sampling mode of video flows, see sdp::sampling
const web::json::field_as_string_or color_sampling{ U("color_sampling"), U("YCbCr-4:2:2") };
// component_depth: controls the bits per component sample of video flows
const web::json::field_as_integer_or component_depth{ U("component_depth"), 10 };
// video_type: media type of video flows, e.g. "video/raw" or "video/jxsv", see nmos::media_types
const web::json::field_as_string_or video_type{ U("video_type"), U("video/raw") };
// channel_count: controls the number of channels in audio sources
const web::json::field_as_integer_or channel_count{ U("channel_count"), 4 };
// smpte2022_7: controls whether senders and receivers have one leg (false) or two legs (true, default)
const web::json::field_as_bool_or smpte2022_7{ U("smpte2022_7"), true };
}
nmos::interlace_mode get_interlace_mode(const nmos::settings& settings);
// the different kinds of 'port' (standing for the format/media type/event type) implemented by the example node
// each 'port' of the example node has a source, flow, sender and/or compatible receiver
DEFINE_STRING_ENUM(port)
namespace ports
{
// video/raw, video/jxsv, etc.
const port video{ U("v") };
// audio/L24
const port audio{ U("a") };
// video/smpte291
const port data{ U("d") };
// video/SMPTE2022-6
const port mux{ U("m") };
// example measurement event
const port temperature{ U("t") };
// example boolean event
const port burn{ U("b") };
// example string event
const port nonsense{ U("s") };
// example number/enum event
const port catcall{ U("c") };
const std::vector<port> rtp{ video, audio, data, mux };
const std::vector<port> ws{ temperature, burn, nonsense, catcall };
const std::vector<port> all{ boost::copy_range<std::vector<port>>(boost::range::join(rtp, ws)) };
}
bool is_rtp_port(const port& port);
bool is_ws_port(const port& port);
std::vector<port> parse_ports(const web::json::value& value);
const std::vector<nmos::channel> channels_repeat{
{ U("Left Channel"), nmos::channel_symbols::L },
{ U("Right Channel"), nmos::channel_symbols::R },
{ U("Center Channel"), nmos::channel_symbols::C },
{ U("Low Frequency Effects Channel"), nmos::channel_symbols::LFE }
};
// find interface with the specified address
std::vector<web::hosts::experimental::host_interface>::const_iterator find_interface(const std::vector<web::hosts::experimental::host_interface>& interfaces, const utility::string_t& address);
// generate repeatable ids for the example node's resources
nmos::id make_id(const nmos::id& seed_id, const nmos::type& type, const port& port = {}, int index = 0);
std::vector<nmos::id> make_ids(const nmos::id& seed_id, const nmos::type& type, const port& port, int how_many = 1);
std::vector<nmos::id> make_ids(const nmos::id& seed_id, const nmos::type& type, const std::vector<port>& ports, int how_many = 1);
std::vector<nmos::id> make_ids(const nmos::id& seed_id, const std::vector<nmos::type>& types, const std::vector<port>& ports, int how_many = 1);
// generate a repeatable source-specific multicast address for each leg of a sender
utility::string_t make_source_specific_multicast_address_v4(const nmos::id& id, int leg = 0);
// add a selection of parents to a source or flow
void insert_parents(nmos::resource& resource, const nmos::id& seed_id, const port& port, int index);
// add a helpful suffix to the label of a sub-resource for the example node
void set_label_description(nmos::resource& resource, const port& port, int index);
// add an example "natural grouping" hint to a sender or receiver
void insert_group_hint(nmos::resource& resource, const port& port, int index);
// specific event types used by the example node
const auto temperature_Celsius = nmos::event_types::measurement(U("temperature"), U("C"));
const auto temperature_wildcard = nmos::event_types::measurement(U("temperature"), nmos::event_types::wildcard);
const auto catcall = nmos::event_types::named_enum(nmos::event_types::number, U("caterwaul"));
}
// forward declarations for node_implementation_thread
void node_implementation_init(nmos::node_model& model, nmos::experimental::control_protocol_state& control_protocol_state, slog::base_gate& gate);
void node_implementation_run(nmos::node_model& model, slog::base_gate& gate);
nmos::connection_resource_auto_resolver make_node_implementation_auto_resolver(const nmos::settings& settings);
nmos::connection_sender_transportfile_setter make_node_implementation_transportfile_setter(const nmos::resources& node_resources, const nmos::settings& settings);
struct node_implementation_init_exception {};
// This is an example of how to integrate the nmos-cpp library with a device-specific underlying implementation.
// It constructs and inserts a node resource and some sub-resources into the model, based on the model settings,
// starts background tasks to emit regular events from the temperature event source, and then waits for shutdown.
void node_implementation_thread(nmos::node_model& model, nmos::experimental::control_protocol_state& control_protocol_state, slog::base_gate& gate_)
{
nmos::details::omanip_gate gate{ gate_, nmos::stash_category(impl::categories::node_implementation) };
try
{
node_implementation_init(model, control_protocol_state, gate);
node_implementation_run(model, gate);
}
catch (const node_implementation_init_exception&)
{
// node_implementation_init writes the log message
}
catch (const web::json::json_exception& e)
{
// most likely from incorrect value types in the command line settings
slog::log<slog::severities::error>(gate, SLOG_FLF) << "JSON error: " << e.what();
}
catch (const std::system_error& e)
{
slog::log<slog::severities::error>(gate, SLOG_FLF) << "System error: " << e.what() << " [" << e.code() << "]";
}
catch (const std::runtime_error& e)
{
slog::log<slog::severities::error>(gate, SLOG_FLF) << "Implementation error: " << e.what();
}
catch (const std::exception& e)
{
slog::log<slog::severities::error>(gate, SLOG_FLF) << "Unexpected exception: " << e.what();
}
catch (...)
{
slog::log<slog::severities::severe>(gate, SLOG_FLF) << "Unexpected unknown exception";
}
}
void node_implementation_init(nmos::node_model& model, nmos::experimental::control_protocol_state& control_protocol_state, slog::base_gate& gate)
{
using web::json::value;
using web::json::value_from_elements;
using web::json::value_of;
auto lock = model.write_lock(); // in order to update the resources
const auto seed_id = nmos::experimental::fields::seed_id(model.settings);
const auto node_id = impl::make_id(seed_id, nmos::types::node);
const auto device_id = impl::make_id(seed_id, nmos::types::device);
const auto how_many = impl::fields::how_many(model.settings);
const auto sender_ports = impl::parse_ports(impl::fields::senders(model.settings));
const auto rtp_sender_ports = boost::copy_range<std::vector<impl::port>>(sender_ports | boost::adaptors::filtered(impl::is_rtp_port));
const auto ws_sender_ports = boost::copy_range<std::vector<impl::port>>(sender_ports | boost::adaptors::filtered(impl::is_ws_port));
const auto receiver_ports = impl::parse_ports(impl::fields::receivers(model.settings));
const auto rtp_receiver_ports = boost::copy_range<std::vector<impl::port>>(receiver_ports | boost::adaptors::filtered(impl::is_rtp_port));
const auto ws_receiver_ports = boost::copy_range<std::vector<impl::port>>(receiver_ports | boost::adaptors::filtered(impl::is_ws_port));
const auto frame_rate = nmos::parse_rational(impl::fields::frame_rate(model.settings));
const auto frame_width = impl::fields::frame_width(model.settings);
const auto frame_height = impl::fields::frame_height(model.settings);
const auto interlace_mode = impl::get_interlace_mode(model.settings);
const auto colorspace = nmos::colorspace{ impl::fields::colorspace(model.settings) };
const auto transfer_characteristic = nmos::transfer_characteristic{ impl::fields::transfer_characteristic(model.settings) };
const auto sampling = sdp::sampling{ impl::fields::color_sampling(model.settings) };
const auto bit_depth = impl::fields::component_depth(model.settings);
const auto video_type = nmos::media_type{ impl::fields::video_type(model.settings) };
const auto channel_count = impl::fields::channel_count(model.settings);
const auto smpte2022_7 = impl::fields::smpte2022_7(model.settings);
// for now, some typical values for video/jxsv, based on VSF TR-08:2022
// see https://vsf.tv/download/technical_recommendations/VSF_TR-08_2022-04-20.pdf
const auto profile = nmos::profiles::High444_12;
const auto level = nmos::get_video_jxsv_level(frame_rate, frame_width, frame_height);
const auto sublevel = nmos::sublevels::Sublev3bpp;
const auto max_bits_per_pixel = 4.0; // min coding efficiency
const auto bits_per_pixel = 2.0;
const auto transport_bit_rate_factor = 1.05;
// any delay between updates to the model resources is unnecessary unless for debugging purposes
const unsigned int delay_millis{ 0 };
// it is important that the model be locked before inserting, updating or deleting a resource
// and that the the node behaviour thread be notified after doing so
const auto insert_resource_after = [&model, &lock](unsigned int milliseconds, nmos::resources& resources, nmos::resource&& resource, slog::base_gate& gate)
{
if (nmos::details::wait_for(model.shutdown_condition, lock, bst::chrono::milliseconds(milliseconds), [&] { return model.shutdown; })) return false;
const auto is_control_protocol_resource = [&resource]() { return nmos::types::all_nc.end() != std::find(nmos::types::all_nc.begin(), nmos::types::all_nc.end(), resource.type); };
const std::pair<nmos::id, nmos::type> id_type{ resource.id, resource.type };
const bool success = is_control_protocol_resource() ? insert_control_protocol_resource(resources, std::move(resource)).second : insert_resource(resources, std::move(resource)).second;
if (success)
slog::log<slog::severities::info>(gate, SLOG_FLF) << "Updated model with " << id_type;
else
slog::log<slog::severities::severe>(gate, SLOG_FLF) << "Model update error: " << id_type;
slog::log<slog::severities::too_much_info>(gate, SLOG_FLF) << "Notifying node behaviour thread"; // and anyone else who cares...
model.notify();
return success;
};
// it is important that the model be locked before inserting, updating or deleting a resource
// and that the the node behaviour thread be notified after doing so
const auto insert_root_after = [&model, insert_resource_after](unsigned int milliseconds, nmos::control_protocol_resource& root, slog::base_gate& gate)
{
std::function<void(nmos::resources& resources, nmos::control_protocol_resource& resource)> insert_resources;
insert_resources = [&milliseconds, insert_resource_after, &insert_resources, &gate](nmos::resources& resources, nmos::control_protocol_resource& resource)
{
for (auto& resource_ : resource.resources)
{
insert_resources(resources, resource_);
if (!insert_resource_after(milliseconds, resources, std::move(resource_), gate)) throw node_implementation_init_exception();
}
resource.resources.clear();
};
auto& resources = model.control_protocol_resources;
insert_resources(resources, root);
if (!insert_resource_after(milliseconds, resources, std::move(root), gate)) throw node_implementation_init_exception();
};
const auto resolve_auto = make_node_implementation_auto_resolver(model.settings);
const auto set_transportfile = make_node_implementation_transportfile_setter(model.node_resources, model.settings);
const auto clocks = web::json::value_of({ nmos::make_internal_clock(nmos::clock_names::clk0) });
// filter network interfaces to those that correspond to the specified host_addresses
const auto host_interfaces = nmos::get_host_interfaces(model.settings);
const auto interfaces = nmos::experimental::node_interfaces(host_interfaces);
// example node
{
auto node = nmos::make_node(node_id, clocks, nmos::make_node_interfaces(interfaces), model.settings);
node.data[nmos::fields::tags] = impl::fields::node_tags(model.settings);
if (!insert_resource_after(delay_millis, model.node_resources, std::move(node), gate)) throw node_implementation_init_exception();
}
#ifdef HAVE_LLDP
// LLDP manager for advertising server identity, capabilities, and discovering neighbours on a local area network
slog::log<slog::severities::info>(gate, SLOG_FLF) << "Attempting to configure LLDP";
auto lldp_manager = nmos::experimental::make_lldp_manager(model, interfaces, true, gate);
// hm, open may potentially throw?
lldp::lldp_manager_guard lldp_manager_guard(lldp_manager);
#endif
// prepare interface bindings for all senders and receivers
const auto& host_address = nmos::fields::host_address(model.settings);
// the interface corresponding to the host address is used for the example node's WebSocket senders and receivers
const auto host_interface_ = impl::find_interface(host_interfaces, host_address);
if (host_interfaces.end() == host_interface_)
{
slog::log<slog::severities::severe>(gate, SLOG_FLF) << "No network interface corresponding to host_address?";
throw node_implementation_init_exception();
}
const auto& host_interface = *host_interface_;
// hmm, should probably add a custom setting to control the primary and secondary interfaces for the example node's RTP senders and receivers
// rather than just picking the one(s) corresponding to the first and last of the specified host addresses
const auto& primary_address = model.settings.has_field(nmos::fields::host_addresses) ? web::json::front(nmos::fields::host_addresses(model.settings)).as_string() : host_address;
const auto& secondary_address = model.settings.has_field(nmos::fields::host_addresses) ? web::json::back(nmos::fields::host_addresses(model.settings)).as_string() : host_address;
const auto primary_interface_ = impl::find_interface(host_interfaces, primary_address);
const auto secondary_interface_ = impl::find_interface(host_interfaces, secondary_address);
if (host_interfaces.end() == primary_interface_ || host_interfaces.end() == secondary_interface_)
{
slog::log<slog::severities::severe>(gate, SLOG_FLF) << "No network interface corresponding to one of the host_addresses?";
throw node_implementation_init_exception();
}
const auto& primary_interface = *primary_interface_;
const auto& secondary_interface = *secondary_interface_;
const auto interface_names = smpte2022_7
? std::vector<utility::string_t>{ primary_interface.name, secondary_interface.name }
: std::vector<utility::string_t>{ primary_interface.name };
// example device
{
auto sender_ids = impl::make_ids(seed_id, nmos::types::sender, rtp_sender_ports, how_many);
if (0 <= nmos::fields::events_port(model.settings)) boost::range::push_back(sender_ids, impl::make_ids(seed_id, nmos::types::sender, ws_sender_ports, how_many));
auto receiver_ids = impl::make_ids(seed_id, nmos::types::receiver, receiver_ports, how_many);
auto device = nmos::make_device(device_id, node_id, sender_ids, receiver_ids, model.settings);
device.data[nmos::fields::tags] = impl::fields::device_tags(model.settings);
if (!insert_resource_after(delay_millis, model.node_resources, std::move(device), gate)) throw node_implementation_init_exception();
}
// example sources, flows and senders
for (int index = 0; index < how_many; ++index)
{
for (const auto& port : rtp_sender_ports)
{
const auto source_id = impl::make_id(seed_id, nmos::types::source, port, index);
const auto flow_id = impl::make_id(seed_id, nmos::types::flow, port, index);
const auto sender_id = impl::make_id(seed_id, nmos::types::sender, port, index);
nmos::resource source;
if (impl::ports::video == port)
{
source = nmos::make_video_source(source_id, device_id, nmos::clock_names::clk0, frame_rate, model.settings);
}
else if (impl::ports::audio == port)
{
const auto channels = boost::copy_range<std::vector<nmos::channel>>(boost::irange(0, channel_count) | boost::adaptors::transformed([&](const int& index)
{
return impl::channels_repeat[index % (int)impl::channels_repeat.size()];
}));
source = nmos::make_audio_source(source_id, device_id, nmos::clock_names::clk0, frame_rate, channels, model.settings);
}
else if (impl::ports::data == port)
{
source = nmos::make_data_source(source_id, device_id, nmos::clock_names::clk0, frame_rate, model.settings);
}
else if (impl::ports::mux == port)
{
source = nmos::make_mux_source(source_id, device_id, nmos::clock_names::clk0, frame_rate, model.settings);
}
impl::insert_parents(source, seed_id, port, index);
impl::set_label_description(source, port, index);
nmos::resource flow;
if (impl::ports::video == port)
{
if (nmos::media_types::video_raw == video_type)
{
flow = nmos::make_raw_video_flow(
flow_id, source_id, device_id,
frame_rate,
frame_width, frame_height, interlace_mode,
colorspace, transfer_characteristic, sampling, bit_depth,
model.settings
);
}
else if (nmos::media_types::video_jxsv == video_type)
{
flow = nmos::make_video_jxsv_flow(
flow_id, source_id, device_id,
frame_rate,
frame_width, frame_height, interlace_mode,
colorspace, transfer_characteristic, sampling, bit_depth,
profile, level, sublevel, bits_per_pixel,
model.settings
);
}
else
{
flow = nmos::make_coded_video_flow(
flow_id, source_id, device_id,
frame_rate,
frame_width, frame_height, interlace_mode,
colorspace, transfer_characteristic, sampling, bit_depth,
video_type,
model.settings
);
}
}
else if (impl::ports::audio == port)
{
flow = nmos::make_raw_audio_flow(flow_id, source_id, device_id, 48000, 24, model.settings);
// add optional grain_rate
flow.data[nmos::fields::grain_rate] = nmos::make_rational(frame_rate);
}
else if (impl::ports::data == port)
{
nmos::did_sdid timecode{ 0x60, 0x60 };
flow = nmos::make_sdianc_data_flow(flow_id, source_id, device_id, { timecode }, model.settings);
// add optional grain_rate
flow.data[nmos::fields::grain_rate] = nmos::make_rational(frame_rate);
}
else if (impl::ports::mux == port)
{
flow = nmos::make_mux_flow(flow_id, source_id, device_id, model.settings);
// add optional grain_rate
flow.data[nmos::fields::grain_rate] = nmos::make_rational(frame_rate);
}
impl::insert_parents(flow, seed_id, port, index);
impl::set_label_description(flow, port, index);
// set_transportfile needs to find the matching source and flow for the sender, so insert these first
if (!insert_resource_after(delay_millis, model.node_resources, std::move(source), gate)) throw node_implementation_init_exception();
if (!insert_resource_after(delay_millis, model.node_resources, std::move(flow), gate)) throw node_implementation_init_exception();
const auto manifest_href = nmos::experimental::make_manifest_api_manifest(sender_id, model.settings);
auto sender = nmos::make_sender(sender_id, flow_id, nmos::transports::rtp, device_id, manifest_href.to_string(), interface_names, model.settings);
// hm, could add nmos::make_video_jxsv_sender to encapsulate this?
if (impl::ports::video == port && nmos::media_types::video_jxsv == video_type)
{
// additional attributes required by BCP-006-01
// see https://specs.amwa.tv/bcp-006-01/branches/v1.0-dev/docs/NMOS_With_JPEG_XS.html#senders
const auto format_bit_rate = nmos::get_video_jxsv_bit_rate(frame_rate, frame_width, frame_height, bits_per_pixel);
// round to nearest Megabit/second per examples in VSF TR-08:2022
const auto transport_bit_rate = uint64_t(transport_bit_rate_factor * format_bit_rate / 1e3 + 0.5) * 1000;
sender.data[nmos::fields::bit_rate] = value(transport_bit_rate);
sender.data[nmos::fields::st2110_21_sender_type] = value(nmos::st2110_21_sender_types::type_N.name);
}
impl::set_label_description(sender, port, index);
impl::insert_group_hint(sender, port, index);
auto connection_sender = nmos::make_connection_rtp_sender(sender_id, smpte2022_7);
// add some example constraints; these should be completed fully!
connection_sender.data[nmos::fields::endpoint_constraints][0][nmos::fields::source_ip] = value_of({
{ nmos::fields::constraint_enum, value_from_elements(primary_interface.addresses) }
});
if (smpte2022_7) connection_sender.data[nmos::fields::endpoint_constraints][1][nmos::fields::source_ip] = value_of({
{ nmos::fields::constraint_enum, value_from_elements(secondary_interface.addresses) }
});
if (impl::fields::activate_senders(model.settings))
{
// initialize this sender with a scheduled activation, e.g. to enable the IS-05-01 test suite to run immediately
auto& staged = connection_sender.data[nmos::fields::endpoint_staged];
staged[nmos::fields::master_enable] = value::boolean(true);
staged[nmos::fields::activation] = value_of({
{ nmos::fields::mode, nmos::activation_modes::activate_scheduled_relative.name },
{ nmos::fields::requested_time, U("0:0") },
{ nmos::fields::activation_time, nmos::make_version() }
});
}
if (!insert_resource_after(delay_millis, model.node_resources, std::move(sender), gate)) throw node_implementation_init_exception();
if (!insert_resource_after(delay_millis, model.connection_resources, std::move(connection_sender), gate)) throw node_implementation_init_exception();
}
}
// example receivers
for (int index = 0; index < how_many; ++index)
{
for (const auto& port : rtp_receiver_ports)
{
const auto receiver_id = impl::make_id(seed_id, nmos::types::receiver, port, index);
nmos::resource receiver;
if (impl::ports::video == port)
{
receiver = nmos::make_receiver(receiver_id, device_id, nmos::transports::rtp, interface_names, nmos::formats::video, { video_type }, model.settings);
// add an example constraint set; these should be completed fully!
if (nmos::media_types::video_raw == video_type)
{
const auto interlace_modes = nmos::interlace_modes::progressive != interlace_mode
? std::vector<utility::string_t>{ nmos::interlace_modes::interlaced_bff.name, nmos::interlace_modes::interlaced_tff.name, nmos::interlace_modes::interlaced_psf.name }
: std::vector<utility::string_t>{ nmos::interlace_modes::progressive.name };
receiver.data[nmos::fields::caps][nmos::fields::constraint_sets] = value_of({
value_of({
{ nmos::caps::format::grain_rate, nmos::make_caps_rational_constraint({ frame_rate }) },
{ nmos::caps::format::frame_width, nmos::make_caps_integer_constraint({ frame_width }) },
{ nmos::caps::format::frame_height, nmos::make_caps_integer_constraint({ frame_height }) },
{ nmos::caps::format::interlace_mode, nmos::make_caps_string_constraint(interlace_modes) },
{ nmos::caps::format::color_sampling, nmos::make_caps_string_constraint({ sampling.name }) }
})
});
}
else if (nmos::media_types::video_jxsv == video_type)
{
// some of the parameter constraints recommended by BCP-006-01
// see https://specs.amwa.tv/bcp-006-01/branches/v1.0-dev/docs/NMOS_With_JPEG_XS.html#receivers
const auto max_format_bit_rate = nmos::get_video_jxsv_bit_rate(frame_rate, frame_width, frame_height, max_bits_per_pixel);
// round to nearest Megabit/second per examples in VSF TR-08:2022
const auto max_transport_bit_rate = uint64_t(transport_bit_rate_factor * max_format_bit_rate / 1e3 + 0.5) * 1000;
receiver.data[nmos::fields::caps][nmos::fields::constraint_sets] = value_of({
value_of({
{ nmos::caps::format::profile, nmos::make_caps_string_constraint({ profile.name }) },
{ nmos::caps::format::level, nmos::make_caps_string_constraint({ level.name }) },
{ nmos::caps::format::sublevel, nmos::make_caps_string_constraint({ nmos::sublevels::Sublev3bpp.name, nmos::sublevels::Sublev4bpp.name }) },
{ nmos::caps::format::bit_rate, nmos::make_caps_integer_constraint({}, nmos::no_minimum<int64_t>(), (int64_t)max_format_bit_rate) },
{ nmos::caps::transport::bit_rate, nmos::make_caps_integer_constraint({}, nmos::no_minimum<int64_t>(), (int64_t)max_transport_bit_rate) },
{ nmos::caps::transport::packet_transmission_mode, nmos::make_caps_string_constraint({ nmos::packet_transmission_modes::codestream.name }) }
})
});
}
receiver.data[nmos::fields::version] = receiver.data[nmos::fields::caps][nmos::fields::version] = value(nmos::make_version());
}
else if (impl::ports::audio == port)
{
receiver = nmos::make_audio_receiver(receiver_id, device_id, nmos::transports::rtp, interface_names, 24, model.settings);
// add some example constraint sets; these should be completed fully!
receiver.data[nmos::fields::caps][nmos::fields::constraint_sets] = value_of({
value_of({
{ nmos::caps::format::channel_count, nmos::make_caps_integer_constraint({}, 1, channel_count) },
{ nmos::caps::format::sample_rate, nmos::make_caps_rational_constraint({ { 48000, 1 } }) },
{ nmos::caps::format::sample_depth, nmos::make_caps_integer_constraint({ 16, 24 }) },
{ nmos::caps::transport::packet_time, nmos::make_caps_number_constraint({ 0.125 }) }
}),
value_of({
{ nmos::caps::meta::preference, -1 },
{ nmos::caps::format::channel_count, nmos::make_caps_integer_constraint({}, 1, (std::min)(8, channel_count)) },
{ nmos::caps::format::sample_rate, nmos::make_caps_rational_constraint({ { 48000, 1 } }) },
{ nmos::caps::format::sample_depth, nmos::make_caps_integer_constraint({ 16, 24 }) },
{ nmos::caps::transport::packet_time, nmos::make_caps_number_constraint({ 1 }) }
})
});
receiver.data[nmos::fields::version] = receiver.data[nmos::fields::caps][nmos::fields::version] = value(nmos::make_version());
}
else if (impl::ports::data == port)
{
receiver = nmos::make_sdianc_data_receiver(receiver_id, device_id, nmos::transports::rtp, interface_names, model.settings);
// add an example constraint set; these should be completed fully!
receiver.data[nmos::fields::caps][nmos::fields::constraint_sets] = value_of({
value_of({
{ nmos::caps::format::grain_rate, nmos::make_caps_rational_constraint({ frame_rate }) }
})
});
receiver.data[nmos::fields::version] = receiver.data[nmos::fields::caps][nmos::fields::version] = value(nmos::make_version());
}
else if (impl::ports::mux == port)
{
receiver = nmos::make_mux_receiver(receiver_id, device_id, nmos::transports::rtp, interface_names, model.settings);
// add an example constraint set; these should be completed fully!
receiver.data[nmos::fields::caps][nmos::fields::constraint_sets] = value_of({
value_of({
{ nmos::caps::format::grain_rate, nmos::make_caps_rational_constraint({ frame_rate }) }
})
});
receiver.data[nmos::fields::version] = receiver.data[nmos::fields::caps][nmos::fields::version] = value(nmos::make_version());
}
impl::set_label_description(receiver, port, index);
impl::insert_group_hint(receiver, port, index);
auto connection_receiver = nmos::make_connection_rtp_receiver(receiver_id, smpte2022_7);
// add some example constraints; these should be completed fully!
connection_receiver.data[nmos::fields::endpoint_constraints][0][nmos::fields::interface_ip] = value_of({
{ nmos::fields::constraint_enum, value_from_elements(primary_interface.addresses) }
});
if (smpte2022_7) connection_receiver.data[nmos::fields::endpoint_constraints][1][nmos::fields::interface_ip] = value_of({
{ nmos::fields::constraint_enum, value_from_elements(secondary_interface.addresses) }
});
resolve_auto(receiver, connection_receiver, connection_receiver.data[nmos::fields::endpoint_active][nmos::fields::transport_params]);
if (!insert_resource_after(delay_millis, model.node_resources, std::move(receiver), gate)) throw node_implementation_init_exception();
if (!insert_resource_after(delay_millis, model.connection_resources, std::move(connection_receiver), gate)) throw node_implementation_init_exception();
}
}
// example event sources, flows and senders
for (int index = 0; 0 <= nmos::fields::events_port(model.settings) && index < how_many; ++index)
{
for (const auto& port : ws_sender_ports)
{
const auto source_id = impl::make_id(seed_id, nmos::types::source, port, index);
const auto flow_id = impl::make_id(seed_id, nmos::types::flow, port, index);
const auto sender_id = impl::make_id(seed_id, nmos::types::sender, port, index);
nmos::event_type event_type;
web::json::value events_type;
web::json::value events_state;
if (impl::ports::temperature == port)
{
event_type = impl::temperature_Celsius;
// see https://specs.amwa.tv/is-07/releases/v1.0.1/docs/3.0._Event_types.html#231-measurements
// and https://specs.amwa.tv/is-07/releases/v1.0.1/examples/eventsapi-type-number-measurement-get-200.html
// and https://specs.amwa.tv/is-07/releases/v1.0.1/examples/eventsapi-state-number-measurement-get-200.html
events_type = nmos::make_events_number_type({ -200, 10 }, { 1000, 10 }, { 1, 10 }, U("C"));
events_state = nmos::make_events_number_state({ source_id, flow_id }, { 201, 10 }, event_type);
}
else if (impl::ports::burn == port)
{
event_type = nmos::event_types::boolean;
// see https://specs.amwa.tv/is-07/releases/v1.0.1/docs/3.0._Event_types.html#21-boolean
events_type = nmos::make_events_boolean_type();
events_state = nmos::make_events_boolean_state({ source_id, flow_id }, false);
}
else if (impl::ports::nonsense == port)
{
event_type = nmos::event_types::string;
// see https://specs.amwa.tv/is-07/releases/v1.0.1/docs/3.0._Event_types.html#22-string
// and of course, https://en.wikipedia.org/wiki/Metasyntactic_variable
events_type = nmos::make_events_string_type(0, 0, U("^foo|bar|baz|qu+x$"));
events_state = nmos::make_events_string_state({ source_id, flow_id }, U("foo"));
}
else if (impl::ports::catcall == port)
{
event_type = impl::catcall;
// see https://specs.amwa.tv/is-07/releases/v1.0.1/docs/3.0._Event_types.html#3-enum
events_type = nmos::make_events_number_enum_type({
{ 1, { U("meow"), U("chatty") } },
{ 2, { U("purr"), U("happy") } },
{ 4, { U("hiss"), U("afraid") } },
{ 8, { U("yowl"), U("sonorous") } }
});
events_state = nmos::make_events_number_state({ source_id, flow_id }, 1, event_type);
}
// grain_rate is not set because these events are aperiodic
auto source = nmos::make_data_source(source_id, device_id, {}, event_type, model.settings);
impl::set_label_description(source, port, index);
auto events_source = nmos::make_events_source(source_id, events_state, events_type);
auto flow = nmos::make_json_data_flow(flow_id, source_id, device_id, event_type, model.settings);
impl::set_label_description(flow, port, index);
auto sender = nmos::make_sender(sender_id, flow_id, nmos::transports::websocket, device_id, {}, { host_interface.name }, model.settings);
impl::set_label_description(sender, port, index);
impl::insert_group_hint(sender, port, index);
// initialize this sender enabled, just to enable the IS-07-02 test suite to run immediately
auto connection_sender = nmos::make_connection_events_websocket_sender(sender_id, device_id, source_id, model.settings);
connection_sender.data[nmos::fields::endpoint_active][nmos::fields::master_enable] = connection_sender.data[nmos::fields::endpoint_staged][nmos::fields::master_enable] = value::boolean(true);
resolve_auto(sender, connection_sender, connection_sender.data[nmos::fields::endpoint_active][nmos::fields::transport_params]);
nmos::set_resource_subscription(sender, nmos::fields::master_enable(connection_sender.data[nmos::fields::endpoint_active]), {}, nmos::tai_now());
if (!insert_resource_after(delay_millis, model.node_resources, std::move(source), gate)) throw node_implementation_init_exception();
if (!insert_resource_after(delay_millis, model.node_resources, std::move(flow), gate)) throw node_implementation_init_exception();
if (!insert_resource_after(delay_millis, model.node_resources, std::move(sender), gate)) throw node_implementation_init_exception();
if (!insert_resource_after(delay_millis, model.connection_resources, std::move(connection_sender), gate)) throw node_implementation_init_exception();
if (!insert_resource_after(delay_millis, model.events_resources, std::move(events_source), gate)) throw node_implementation_init_exception();
}
}
// example event receivers
for (int index = 0; index < how_many; ++index)
{
for (const auto& port : ws_receiver_ports)
{
const auto receiver_id = impl::make_id(seed_id, nmos::types::receiver, port, index);
nmos::event_type event_type;
if (impl::ports::temperature == port)
{
// accept e.g. "number/temperature/F" or "number/temperature/K" as well as "number/temperature/C"
event_type = impl::temperature_wildcard;
}
else if (impl::ports::burn == port)
{
// accept any boolean
event_type = nmos::event_types::wildcard(nmos::event_types::boolean);
}
else if (impl::ports::nonsense == port)
{
// accept any string
event_type = nmos::event_types::wildcard(nmos::event_types::string);
}
else if (impl::ports::catcall == port)
{
// accept only a catcall
event_type = impl::catcall;
}
auto receiver = nmos::make_data_receiver(receiver_id, device_id, nmos::transports::websocket, { host_interface.name }, nmos::media_types::application_json, { event_type }, model.settings);
impl::set_label_description(receiver, port, index);
impl::insert_group_hint(receiver, port, index);
auto connection_receiver = nmos::make_connection_events_websocket_receiver(receiver_id, model.settings);
resolve_auto(receiver, connection_receiver, connection_receiver.data[nmos::fields::endpoint_active][nmos::fields::transport_params]);
if (!insert_resource_after(delay_millis, model.node_resources, std::move(receiver), gate)) throw node_implementation_init_exception();
if (!insert_resource_after(delay_millis, model.connection_resources, std::move(connection_receiver), gate)) throw node_implementation_init_exception();
}
}
// example channelmapping resources demonstrating a range of input/output capabilities
// see https://github.com/sony/nmos-cpp/issues/111#issuecomment-740613137
// example audio inputs
const bool channelmapping_receivers = 0 <= nmos::fields::channelmapping_port(model.settings) && rtp_receiver_ports.end() != boost::range::find(rtp_receiver_ports, impl::ports::audio);
for (int index = 0; channelmapping_receivers && index < how_many; ++index)
{
const auto stri = utility::conversions::details::to_string_t(index);
const auto id = U("input") + stri;
const auto name = U("IP Input ") + stri;
const auto description = U("SMPTE 2110-30 IP Input ") + stri;
const auto receiver_id = impl::make_id(seed_id, nmos::types::receiver, impl::ports::audio, index);
const auto parent = std::pair<nmos::id, nmos::type>(receiver_id, nmos::types::receiver);
const auto channel_labels = boost::copy_range<std::vector<utility::string_t>>(boost::irange(0, channel_count) | boost::adaptors::transformed([&](const int& index)
{
return impl::channels_repeat[index % (int)impl::channels_repeat.size()].label;
}));
// use default input capabilities to indicate no constraints
auto channelmapping_input = nmos::make_channelmapping_input(id, name, description, parent, channel_labels);
if (!insert_resource_after(delay_millis, model.channelmapping_resources, std::move(channelmapping_input), gate)) throw node_implementation_init_exception();
}
// example audio outputs
const bool channelmapping_senders = 0 <= nmos::fields::channelmapping_port(model.settings) && rtp_sender_ports.end() != boost::range::find(rtp_sender_ports, impl::ports::audio);
for (int index = 0; channelmapping_senders && index < how_many; ++index)
{
const auto stri = utility::conversions::details::to_string_t(index);
const auto id = U("output") + stri;
const auto name = U("IP Output ") + stri;
const auto description = U("SMPTE 2110-30 IP Output ") + stri;
const auto source_id = impl::make_id(seed_id, nmos::types::source, impl::ports::audio, index);
const auto channel_labels = boost::copy_range<std::vector<utility::string_t>>(boost::irange(0, channel_count) | boost::adaptors::transformed([&](const int& index)
{
return impl::channels_repeat[index % (int)impl::channels_repeat.size()].label;
}));
// omit routable inputs to indicate no restrictions
auto channelmapping_output = nmos::make_channelmapping_output(id, name, description, source_id, channel_labels);
if (!insert_resource_after(delay_millis, model.channelmapping_resources, std::move(channelmapping_output), gate)) throw node_implementation_init_exception();
}
const int input_block_size = 8;
const int input_block_count = 8;
// example non-IP audio input
if (0 <= nmos::fields::channelmapping_port(model.settings))
{
const auto id = U("inputA");
const auto name = U("MADI Input A");
const auto description = U("MADI Input A");
// non-IP audio inputs have no parent
const auto parent = std::pair<nmos::id, nmos::type>();
const auto channel_labels = boost::copy_range<std::vector<utility::string_t>>(boost::irange(0, input_block_size * input_block_count) | boost::adaptors::transformed([](const int& index)
{
return nmos::channel_symbols::Undefined(1 + index).name;
}));
// some example constraints; this input's channels can only be used in blocks and the channels cannot be reordered within each block
const auto reordering = false;
const auto block_size = input_block_size;
auto channelmapping_input = nmos::make_channelmapping_input(id, name, description, parent, channel_labels, reordering, block_size);
if (!insert_resource_after(delay_millis, model.channelmapping_resources, std::move(channelmapping_input), gate)) throw node_implementation_init_exception();
}
// example outputs to some audio gizmo
if (0 <= nmos::fields::channelmapping_port(model.settings))
{
const auto id = U("outputX");
const auto name = U("Gizmo Output X");
const auto description = U("Gizmo Output X");
const auto source_id = impl::make_id(seed_id, nmos::types::source, impl::ports::audio, how_many);
const auto channel_labels = boost::copy_range<std::vector<utility::string_t>>(boost::irange(0, input_block_size) | boost::adaptors::transformed([](const int& index)
{
return nmos::channel_symbols::Undefined(1 + index).name;
}));
// some example constraints; only allow inputs from the example non-IP audio input
auto routable_inputs = std::vector<nmos::channelmapping_id>{ U("inputA") };
// do not allow unrouted channels
// start with a valid active map
auto active_map = boost::copy_range<std::vector<std::pair<nmos::channelmapping_id, uint32_t>>>(boost::irange(0, input_block_size) | boost::adaptors::transformed([](const int& index)
{
return std::pair<nmos::channelmapping_id, uint32_t>{ U("inputA"), index };
}));
auto channelmapping_output = nmos::make_channelmapping_output(id, name, description, source_id, channel_labels, routable_inputs, active_map);
if (!insert_resource_after(delay_millis, model.channelmapping_resources, std::move(channelmapping_output), gate)) throw node_implementation_init_exception();
}
// example source for some audio gizmo
if (0 <= nmos::fields::channelmapping_port(model.settings))
{
const auto source_id = impl::make_id(seed_id, nmos::types::source, impl::ports::audio, how_many);
const auto channels = boost::copy_range<std::vector<nmos::channel>>(boost::irange(0, input_block_size) | boost::adaptors::transformed([](const int& index)
{
return nmos::channel{ {}, nmos::channel_symbols::Undefined(1 + index) };
}));
auto source = nmos::make_audio_source(source_id, device_id, nmos::clock_names::clk0, frame_rate, channels, model.settings);
impl::set_label_description(source, impl::ports::audio, how_many);
if (!insert_resource_after(delay_millis, model.node_resources, std::move(source), gate)) throw node_implementation_init_exception();
}
// example inputs from some audio gizmo
if (0 <= nmos::fields::channelmapping_port(model.settings))
{
const auto id = U("inputX");
const auto name = U("Gizmo Input X");
const auto description = U("Gizmo Input X");
// the audio gizmo is re-entrant
const auto source_id = impl::make_id(seed_id, nmos::types::source, impl::ports::audio, how_many);
const auto parent = std::pair<nmos::id, nmos::type>(source_id, nmos::types::source);
const auto channel_labels = boost::copy_range<std::vector<utility::string_t>>(boost::irange(0, input_block_size) | boost::adaptors::transformed([](const int& index)
{
return nmos::channel_symbols::Undefined(1 + index).name;
}));
// this input is weird, it is block-based but allows reordering of channels within a block
const auto reordering = true;
const auto block_size = 2;
auto channelmapping_input = nmos::make_channelmapping_input(id, name, description, parent, channel_labels, reordering, block_size);
if (!insert_resource_after(delay_millis, model.channelmapping_resources, std::move(channelmapping_input), gate)) throw node_implementation_init_exception();
}
// example non-ST 2110-30 audio output
if (0 <= nmos::fields::channelmapping_port(model.settings))
{
const auto id = U("outputB");
const auto name = U("AES Output B");
const auto description = U("AES Output B");
// non-IP audio outputs have no sourceid
const auto source_id = nmos::id();
const auto channel_labels = boost::copy_range<std::vector<utility::string_t>>(nmos::channel_symbols::ST | boost::adaptors::transformed([](const nmos::channel_symbol& symbol)
{
return symbol.name;
}));
// allow inputs from the audio gizmo
auto routable_inputs = std::vector<nmos::channelmapping_id>{ U("inputX") };
// allow unrouted channels
routable_inputs.push_back({});
auto channelmapping_output = nmos::make_channelmapping_output(id, name, description, source_id, channel_labels, routable_inputs);
if (!insert_resource_after(delay_millis, model.channelmapping_resources, std::move(channelmapping_output), gate)) throw node_implementation_init_exception();
}
// examples of using IS-12 control protocol
// they are based on the NC-DEVICE-MOCK
// See https://specs.amwa.tv/nmos-device-control-mock/#about-nc-device-mock
// See https://github.com/AMWA-TV/nmos-device-control-mock/blob/main/code/src/NCModel/Features.ts
if (0 <= nmos::fields::control_protocol_ws_port(model.settings))
{
// example to create a non-standard Gain control class
const auto gain_control_class_id = nmos::make_nc_class_id(nmos::nc_worker_class_id, 0, { 1 });
const web::json::field_as_number gain_value{ U("gainValue") };
{
// Gain control class property descriptors
std::vector<web::json::value> gain_control_property_descriptors = { nmos::experimental::make_control_class_property_descriptor(U("Gain value"), { 3, 1 }, gain_value, U("NcFloat32")) };
// create Gain control class descriptor
auto gain_control_class_descriptor = nmos::experimental::make_control_class_descriptor(U("Gain control class descriptor"), gain_control_class_id, U("GainControl"), gain_control_property_descriptors);
// insert Gain control class descriptor to global state, which will be used by the control_protocol_ws_message_handler to process incoming ws message
control_protocol_state.insert(gain_control_class_descriptor);
}
// helper function to create Gain control instance
auto make_gain_control = [&gain_value, &gain_control_class_id](nmos::nc_oid oid, nmos::nc_oid owner, const utility::string_t& role, const utility::string_t& user_label, const utility::string_t& description, const web::json::value& touchpoints, const web::json::value& runtime_property_constraints, float gain)
{
auto data = nmos::details::make_nc_worker(gain_control_class_id, oid, true, owner, role, value::string(user_label), description, touchpoints, runtime_property_constraints, true);
data[gain_value] = value::number(gain);
return nmos::control_protocol_resource{ nmos::is12_versions::v1_0, nmos::types::nc_worker, std::move(data), true };
};
// example to create a non-standard Example control class
const auto example_control_class_id = nmos::make_nc_class_id(nmos::nc_worker_class_id, 0, { 2 });
const web::json::field_as_number enum_property{ U("enumProperty") };
const web::json::field_as_string string_property{ U("stringProperty") };
const web::json::field_as_number number_property{ U("numberProperty") };
const web::json::field_as_number deprecated_number_property{ U("deprecatedNumberProperty") };
const web::json::field_as_bool boolean_property{ U("booleanProperty") };
const web::json::field_as_value object_property{ U("objectProperty") };
const web::json::field_as_number method_no_args_count{ U("methodNoArgsCount") };
const web::json::field_as_number method_simple_args_count{ U("methodSimpleArgsCount") };
const web::json::field_as_number method_object_arg_count{ U("methodObjectArgCount") };
const web::json::field_as_array string_sequence{ U("stringSequence") };
const web::json::field_as_array boolean_sequence{ U("booleanSequence") };
const web::json::field_as_array enum_sequence{ U("enumSequence") };
const web::json::field_as_array number_sequence{ U("numberSequence") };
const web::json::field_as_array object_sequence{ U("objectSequence") };
const web::json::field_as_number enum_arg{ U("enumArg") };
const web::json::field_as_string string_arg{ U("stringArg") };
const web::json::field_as_number number_arg{ U("numberArg") };
const web::json::field_as_bool boolean_arg{ U("booleanArg") };
const web::json::field_as_value obj_arg{ U("objArg") };
enum example_enum
{
Undefined = 0,
Alpha = 1,
Beta = 2,
Gamma = 3
};
{
// following constraints are used for the example control class level 0 datatype, level 1 property constraints and the method parameters constraints
auto make_string_example_argument_constraints = []() {return nmos::details::make_nc_parameter_constraints_string(10, U("^[a-z]+$")); };
auto make_number_example_argument_constraints = []() {return nmos::details::make_nc_parameter_constraints_number(0, 1000, 1); };
// Example control class property descriptors
std::vector<web::json::value> example_control_property_descriptors = {
nmos::experimental::make_control_class_property_descriptor(U("Example enum property"), { 3, 1 }, enum_property, U("ExampleEnum")),
// create "Example string property" with level 1: property constraints, See https://specs.amwa.tv/ms-05-02/branches/v1.0.x/docs/Constraints.html
// use nmos::details::make_nc_parameter_constraints_string to create property constraints
nmos::experimental::make_control_class_property_descriptor(U("Example string property"), { 3, 2 }, string_property, U("NcString"), false, false, false, false, make_string_example_argument_constraints()),
// create "Example numeric property" with level 1: property constraints, See https://specs.amwa.tv/ms-05-02/branches/v1.0.x/docs/Constraints.html
// use nmos::details::make_nc_parameter_constraints_number to create property constraints
nmos::experimental::make_control_class_property_descriptor(U("Example numeric property"), { 3, 3 }, number_property, U("NcUint64"), false, false, false, false, make_number_example_argument_constraints()),
nmos::experimental::make_control_class_property_descriptor(U("Example deprecated numeric property"), { 3, 4 }, deprecated_number_property, U("NcUint64"), false, false, false, true, make_number_example_argument_constraints()),
nmos::experimental::make_control_class_property_descriptor(U("Example boolean property"), { 3, 5 }, boolean_property, U("NcBoolean")),
nmos::experimental::make_control_class_property_descriptor(U("Example object property"), { 3, 6 }, object_property, U("ExampleDataType")),
nmos::experimental::make_control_class_property_descriptor(U("Example method no args invoke counter"), { 3, 7 }, method_no_args_count, U("NcUint64"), true),
nmos::experimental::make_control_class_property_descriptor(U("Example method simple args invoke counter"), { 3, 8 }, method_simple_args_count, U("NcUint64"), true),