From 9fd0bbe1cd820ceb7bed88737bcb74d48a8ba35f Mon Sep 17 00:00:00 2001
From: "Andreas R." <temp@ruthner.net>
Date: Thu, 4 Jun 2026 20:55:56 +0200
Subject: [PATCH] V4L2: Apply software binning after frame stacking

The non-stacked mono path calls PrimaryCCD.binFrame() to apply software
binning, but the stacked path (STACK_MEAN, STACK_ADDITIVE, STACK_TAKE_DARK)
writes the full-resolution accumulated frame directly to the CCD buffer
without ever calling binFrame(). This causes a stride mismatch when binning
is enabled, resulting in horizontal striping artifacts in the output image.

Add PrimaryCCD.binFrame() after the stacked frame is written to the output
buffer, matching the behavior of the non-stacked path.

Reported-by: User on indilib.org forum (IMX415 sensor, indi_v4l2_ccd v1.2)
---
 drivers/video/v4l2driver.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/video/v4l2driver.cpp b/drivers/video/v4l2driver.cpp
index cf5fe6b50c..a1e9e8aafc 100644
--- a/drivers/video/v4l2driver.cpp
+++ b/drivers/video/v4l2driver.cpp
@@ -1726,6 +1726,8 @@ void V4L2_Driver::newFrame()
                         guard.unlock();
                     }
                 }
+
+                PrimaryCCD.binFrame();
             }
             PrimaryCCD.setImageExtension("fits");
         }