Backend: endpoint for single output download added

web/backend/api/download.py

@@ -29,7 +29,6 @@ def _prepare_download(task_id: str):
         raise HTTPException(status_code=404, detail="No output files found")
 
     zip_path = settings.temp_dir / task_id / "splits.zip"
-    # Create ZIP if not already exists (or overwrite)
     with ZipFile(zip_path, "w") as zipf:
         for file_path in output_dir.iterdir():
             if file_path.is_file():
@@ -59,3 +58,33 @@ async def download_results_as_zip(task_id: str):
         filename="splits.zip",
         headers={"Content-Disposition": "attachment; filename=splits.zip"}
     )
+
+
+# NEW: Endpoint for downloading individual tracks
+@router.get("/download/{task_id}/{filename}")
+async def download_single_track(task_id: str, filename: str):
+    """
+    Download a single track file from the output directory.
+    """
+    if not task_manager.has_task(task_id):
+        raise HTTPException(status_code=404, detail=f"Task {task_id} not found")
+
+    status = task_manager.get_status(task_id)
+    if status["status"] != TaskStatus.DONE:
+        raise HTTPException(
+            status_code=400,
+            detail=f"Task {task_id} is not complete. Current status: {status['status']}"
+        )
+
+    output_dir = settings.temp_dir / task_id / "output"
+    file_path = output_dir / filename
+
+    if not file_path.exists() or not file_path.is_file():
+        raise HTTPException(status_code=404, detail=f"File '{filename}' not found")
+
+    return FileResponse(
+        path=file_path,
+        filename=filename,
+        media_type="application/octet-stream",
+        headers={"Content-Disposition": f"attachment; filename={filename}"}
+    )