JohannesItten
fe3b5969ca
MXL FlowParser requires urn:x-nmos:tag:grouphint/v1.0 in the tags object of every flow definition. make_audio_flow_def was missing tags entirely, causing FlowParser.cpp:192 "Invalid group hint tag". Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
75 lines
2.8 KiB
C++
75 lines
2.8 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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// Generates a minimal but valid NMOS IS-04 flow definition JSON string
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// for a raw PCM audio flow. grain_rate_num/den sets the grain delivery rate
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// (default 25/1 = one grain per video frame). MXL computes grain size as
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// sample_rate / grain_rate samples per grain.
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inline std::string make_audio_flow_def(
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const std::string& flow_id,
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const std::string& label,
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int sample_rate,
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int channels,
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int bit_depth = 32,
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int grain_rate_num = 25,
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int grain_rate_den = 1)
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{
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using json = nlohmann::json;
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static const char* ch_labels[] = {"L","R","C","LFE","Ls","Rs","Lss","Rss"};
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json ch_arr = json::array();
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for (int i = 0; i < channels; ++i)
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ch_arr.push_back({{"label", i < 8 ? ch_labels[i] : ("Ch" + std::to_string(i + 1))}});
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return json{
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{"id", flow_id},
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{"format", "urn:x-nmos:format:audio"},
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{"label", label},
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{"description", label + " MXL Audio Flow"},
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{"media_type", "audio/L" + std::to_string(bit_depth)},
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{"parents", json::array()},
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{"grain_rate", {{"numerator", grain_rate_num}, {"denominator", grain_rate_den}}},
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{"sample_rate", {{"numerator", sample_rate}, {"denominator", 1}}},
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{"channels", ch_arr},
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{"bit_depth", bit_depth},
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{"tags", {
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{"urn:x-nmos:tag:grouphint/v1.0", json::array({label + ":Audio"})}
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}},
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}.dump();
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}
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} // namespace dmf
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