DEBUG: ENTER logging at libva entry points to trace Firefox call flow

Adds request_log on entry to:
- RequestSyncSurface
- RequestQuerySurfaceAttributes
- RequestQuerySurfaceStatus (including the returned status value)
- RequestDeriveImage
- RequestQueryImageFormats
- RequestGetImage

Goal: identify which API call Firefox 150 makes that returns
differently than it expects, causing the SW fallback after
frame 0. mpv works end-to-end with the surface-export fix in
place; Firefox does not. Per operator's correction: don't assume
mpv's success means the driver is correct — Firefox may detect
a real spec violation that mpv silently tolerates.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/image.c

@@ -184,6 +184,8 @@ VAStatus RequestDeriveImage(VADriverContextP context, VASurfaceID surface_id,
 	VAImageFormat format;
 	VAStatus status;
 
+	request_log("ENTER RequestDeriveImage(surf=%u)\n", surface_id);
+
 	surface_object = SURFACE(driver_data, surface_id);
 	if (surface_object == NULL)
 		return VA_STATUS_ERROR_INVALID_SURFACE;
@@ -216,6 +218,7 @@ VAStatus RequestDeriveImage(VADriverContextP context, VASurfaceID surface_id,
 VAStatus RequestQueryImageFormats(VADriverContextP context,
 				  VAImageFormat *formats, int *formats_count)
 {
+	request_log("ENTER RequestQueryImageFormats\n");
 	formats[0].fourcc = VA_FOURCC_NV12;
 	*formats_count = 1;
 
@@ -237,6 +240,9 @@ VAStatus RequestGetImage(VADriverContextP context, VASurfaceID surface_id,
 	struct object_image *image_object;
 	VAImage *image;
 
+	request_log("ENTER RequestGetImage(surf=%u, x=%d y=%d w=%u h=%u, img=%u)\n",
+		    surface_id, x, y, width, height, image_id);
+
 	surface_object = SURFACE(driver_data, surface_id);
 	if (surface_object == NULL)
 		return VA_STATUS_ERROR_INVALID_SURFACE;

src/surface.c

@@ -341,6 +341,8 @@ VAStatus RequestDestroySurfaces(VADriverContextP context,
 
 VAStatus RequestSyncSurface(VADriverContextP context, VASurfaceID surface_id)
 {
+	request_log("ENTER RequestSyncSurface(surf=%u)\n", surface_id);
+
 	struct request_data *driver_data = context->pDriverData;
 	struct object_surface *surface_object;
 	VAStatus status;
@@ -480,6 +482,9 @@ VAStatus RequestQuerySurfaceAttributes(VADriverContextP context,
 				       VASurfaceAttrib *attributes,
 				       unsigned int *attributes_count)
 {
+	request_log("ENTER RequestQuerySurfaceAttributes(config=%u, attrs_buf=%p)\n",
+		    config, (void *)attributes);
+
 	struct request_data *driver_data = context->pDriverData;
 	VASurfaceAttrib *attributes_list;
 	unsigned int attributes_list_size = V4L2_REQUEST_MAX_CONFIG_ATTRIBUTES *
@@ -558,12 +563,18 @@ VAStatus RequestQuerySurfaceStatus(VADriverContextP context,
 	struct request_data *driver_data = context->pDriverData;
 	struct object_surface *surface_object;
 
+	request_log("ENTER RequestQuerySurfaceStatus(surf=%u)\n", surface_id);
+
 	surface_object = SURFACE(driver_data, surface_id);
 	if (surface_object == NULL)
 		return VA_STATUS_ERROR_INVALID_SURFACE;
 
 	*status = surface_object->status;
 
+	request_log("  -> status=%d (Ready=%d Rendering=%d Displaying=%d)\n",
+		    *status, VASurfaceReady, VASurfaceRendering,
+		    VASurfaceDisplaying);
+
 	return VA_STATUS_SUCCESS;
 }