From 19302b93d1157843013acc1007c61f33e2cf3cf6 Mon Sep 17 00:00:00 2001
From: Kamil Trzcinski <ayufan@ayufan.eu>
Date: Fri, 24 Feb 2023 20:01:07 +0100
Subject: [PATCH] links: to avoid overrun limit amount of buffers enqueued on
 v4l2

---
 device/links.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/device/links.c b/device/links.c
index 1162855..cc8052b 100644
--- a/device/links.c
+++ b/device/links.c
@@ -11,6 +11,9 @@
 #define CAPTURE_TIMEOUT_US (1000*1000)
 #define N_FDS 50
 
+#define MAX_CAPTURED_ON_CAMERA 2
+#define MAX_CAPTURED_ON_M2M 2
+
 typedef struct link_pool_s
 {
   struct pollfd fds[N_FDS];
@@ -119,12 +122,22 @@ static bool links_enqueue_capture_buffers(buffer_list_t *capture_list, int *time
 
   // no output, just give back capture_buf
   if (!output_list) {
+    // limit amount of buffers enqueued by camera
+    if (buffer_list_count_enqueued(capture_list) >= MAX_CAPTURED_ON_CAMERA) {
+      return false;
+    }
+    
     buffer_consumed(capture_buf, "enqueued");
     if (capture_list->fmt.interval_us > 0)
       return false;
     return true;
   }
 
+  // limit amount of buffers enqueued by m2m
+  if (buffer_list_count_enqueued(output_list) >= MAX_CAPTURED_ON_M2M) {
+    return false;
+  }
+
   // try to find matching output slot, ignore if not present
   if (!buffer_list_find_slot(output_list)) {
     return false;