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webmidi: report input timestamps on the monotonic clock's scale #260

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Merged
jcelerier merged 1 commit into from
Sep 21, 2026
Merged

webmidi: report input timestamps on the monotonic clock's scale #260

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5 changes: 4 additions & 1 deletion include/libremidi/backends/emscripten/midi_access.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -289,7 +289,10 @@ class midi_access_emscripten
input.onmidimessage = (message) => {
let bytes = message.data;
var heapBytes = _arrayToHeap(bytes);
Module._libremidi_devices_input(port_index, message.timeStamp, bytes.length, heapBytes.byteOffset);
// message.timeStamp counts from the page's time origin, while
// absolute_timestamp() reads the monotonic clock, which emscripten
// reports as timeOrigin + performance.now(): put both on that scale.
Module._libremidi_devices_input(port_index, performance.timeOrigin + message.timeStamp, bytes.length, heapBytes.byteOffset);
_freeArray(heapBytes);
};
, port_index
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