refactor vainfo to search for first GPU (#21296)

use existing LibvaGpuSelector to pick appropritate libva device

frigate/api/app.py

@@ -32,6 +32,7 @@ from frigate.config.camera.updater import (
     CameraConfigUpdateEnum,
     CameraConfigUpdateTopic,
 )
+from frigate.ffmpeg_presets import FFMPEG_HWACCEL_VAAPI, _gpu_selector
 from frigate.models import Event, Timeline
 from frigate.stats.prometheus import get_metrics, update_metrics
 from frigate.util.builtin import (
@@ -458,7 +459,15 @@ def config_set(request: Request, body: AppConfigSetBody):
 
 @router.get("/vainfo", dependencies=[Depends(allow_any_authenticated())])
 def vainfo():
-    vainfo = vainfo_hwaccel()
+    # Use LibvaGpuSelector to pick an appropriate libva device (if available)
+    selected_gpu = ""
+    try:
+        selected_gpu = _gpu_selector.get_gpu_arg(FFMPEG_HWACCEL_VAAPI, 0) or ""
+    except Exception:
+        selected_gpu = ""
+
+    # If selected_gpu is empty, pass None to vainfo_hwaccel to run plain `vainfo`.
+    vainfo = vainfo_hwaccel(device_name=selected_gpu or None)
     return JSONResponse(
         content={
             "return_code": vainfo.returncode,

frigate/util/services.py

@@ -584,12 +584,17 @@ def ffprobe_stream(ffmpeg, path: str, detailed: bool = False) -> sp.CompletedPro
 
 def vainfo_hwaccel(device_name: Optional[str] = None) -> sp.CompletedProcess:
     """Run vainfo."""
-    ffprobe_cmd = (
-        ["vainfo"]
-        if not device_name
-        else ["vainfo", "--display", "drm", "--device", f"/dev/dri/{device_name}"]
-    )
-    return sp.run(ffprobe_cmd, capture_output=True)
+    if not device_name:
+        cmd = ["vainfo"]
+    else:
+        if os.path.isabs(device_name) and device_name.startswith("/dev/dri/"):
+            device_path = device_name
+        else:
+            device_path = f"/dev/dri/{device_name}"
+
+        cmd = ["vainfo", "--display", "drm", "--device", device_path]
+
+    return sp.run(cmd, capture_output=True)
 
 
 def get_nvidia_driver_info() -> dict[str, Any]: