78 lines
2.6 KiB
JavaScript
78 lines
2.6 KiB
JavaScript
// SonicForge Studio Ghost Note Extractor Service
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(function() {
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function extractGhostLayers(activeTracks, targetTrackId, targetItemId, bpm) {
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if (!activeTracks || !targetItemId) return [];
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const secondsPerBeat = 60.0 / (parseInt(bpm) || 120);
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let targetItem = null;
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for (var i = 0; i < activeTracks.length; i++) {
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var t = activeTracks[i];
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var found = (t.midiItems || []).find(function(m) { return m.id === targetItemId; });
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if (found) { targetItem = found; break; }
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}
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if (!targetItem) return [];
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const windowStartBeat = targetItem.startTime / secondsPerBeat;
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const windowEndBeat = (targetItem.startTime + targetItem.duration) / secondsPerBeat;
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const ghostLayers = [];
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for (var i = 0; i < activeTracks.length; i++) {
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var track = activeTracks[i];
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if (!track.midiItems || !track.midiItems.length) continue;
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if (track.muted) continue;
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var isSameTrack = track.id === targetTrackId;
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var trackGhostNotes = [];
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for (var j = 0; j < track.midiItems.length; j++) {
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var item = track.midiItems[j];
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if (item.id === targetItemId) continue;
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var itemStartBeat = item.startTime / secondsPerBeat;
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var itemEndBeat = (item.startTime + item.duration) / secondsPerBeat;
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// Same-track items always contribute notes (show whole track); cross-track only when overlapping the window
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if (itemStartBeat >= windowEndBeat || itemEndBeat < windowStartBeat) {
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if (!isSameTrack) continue;
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}
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var notes = item.notes || [];
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for (var k = 0; k < notes.length; k++) {
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var note = notes[k];
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var noteAbsStart = itemStartBeat + (note.start_beat || 0);
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var noteAbsEnd = noteAbsStart + (note.duration_beats || 1);
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if (noteAbsStart >= windowEndBeat && !isSameTrack) continue;
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trackGhostNotes.push({
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id: 'ghost_' + (note.id || Math.random().toString(36).substr(2, 9)),
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pitch: note.pitch,
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relative_start_beat: noteAbsStart - windowStartBeat,
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duration_beats: (note.duration_beats || 1),
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velocity: note.velocity,
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item_id: item.id,
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original_track_name: track.name,
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original_track_color: track.color || '#888888'
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});
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}
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}
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if (trackGhostNotes.length > 0) {
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ghostLayers.push({
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track_id: track.id,
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track_name: track.name,
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track_color: track.color || '#6b7280',
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isSameTrack: isSameTrack,
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notes: trackGhostNotes
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});
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}
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}
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return ghostLayers;
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}
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window.SonicGhost = { extractGhostLayers: extractGhostLayers };
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})();
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