JohannesItten
ca682eaf0a
- NodeBase, Signal, FlowDef, V210 shared headers - testpattern node: SMPTE 75% color bars writer at 25fps - fakesink node: non-blocking MXL reader with per-second stats - studio-manager: FlowGraph data model, graph-driven fork/exec launcher - mxl pinned as submodule at 0ae1dc5 Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
40 lines
1.4 KiB
C++
40 lines
1.4 KiB
C++
#pragma once
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#include <string>
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#include <nlohmann/json.hpp>
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namespace dmf {
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// Generates a minimal but valid NMOS IS-04 flow definition JSON string
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// for a video/v210 flow. MXL uses this to set up the ring buffer geometry.
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inline std::string make_video_flow_def(
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const std::string& flow_id,
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const std::string& label,
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int width, int height,
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int fps_num, int fps_den = 1)
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{
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using json = nlohmann::json;
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return json{
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{"id", flow_id},
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{"format", "urn:x-nmos:format:video"},
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{"label", label},
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{"description", label + " MXL Video Flow"},
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{"media_type", "video/v210"},
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{"parents", json::array()},
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{"grain_rate", {{"numerator", fps_num}, {"denominator", fps_den}}},
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{"frame_width", width},
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{"frame_height", height},
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{"interlace_mode", "progressive"},
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{"colorspace", "BT709"},
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{"tags", {
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{"urn:x-nmos:tag:grouphint/v1.0", json::array({label + ":Video"})}
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}},
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{"components", json::array({
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{{"name","Y"}, {"width",width}, {"height",height}, {"bit_depth",10}},
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{{"name","Cb"}, {"width",width/2}, {"height",height}, {"bit_depth",10}},
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{{"name","Cr"}, {"width",width/2}, {"height",height}, {"bit_depth",10}}
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})}
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}.dump();
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}
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} // namespace dmf
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