avcodec/v4l2_buffers: split out v4l2_buf_increase_ref helper

Signed-off-by: Aman Gupta <aman@tmm1.net>

libavcodec/v4l2_buffers.c

@@ -228,27 +228,17 @@ static void v4l2_free_buffer(void *opaque, uint8_t *unused)
     }
 }
 
-static int v4l2_buf_to_bufref(V4L2Buffer *in, int plane, AVBufferRef **buf)
+static int v4l2_buf_increase_ref(V4L2Buffer *in)
 {
     V4L2m2mContext *s = buf_to_m2mctx(in);
 
-    if (plane >= in->num_planes)
-        return AVERROR(EINVAL);
-
-    /* even though most encoders return 0 in data_offset encoding vp8 does require this value */
-    *buf = av_buffer_create((char *)in->plane_info[plane].mm_addr + in->planes[plane].data_offset,
-                            in->plane_info[plane].length, v4l2_free_buffer, in, 0);
-    if (!*buf)
-        return AVERROR(ENOMEM);
-
     if (in->context_ref)
         atomic_fetch_add(&in->context_refcount, 1);
     else {
         in->context_ref = av_buffer_ref(s->self_ref);
-        if (!in->context_ref) {
-            av_buffer_unref(buf);
+        if (!in->context_ref)
             return AVERROR(ENOMEM);
-        }
+
         in->context_refcount = 1;
     }
 
@@ -258,6 +248,26 @@ static int v4l2_buf_to_bufref(V4L2Buffer *in, int plane, AVBufferRef **buf)
     return 0;
 }
 
+static int v4l2_buf_to_bufref(V4L2Buffer *in, int plane, AVBufferRef **buf)
+{
+    int ret;
+
+    if (plane >= in->num_planes)
+        return AVERROR(EINVAL);
+
+    /* even though most encoders return 0 in data_offset encoding vp8 does require this value */
+    *buf = av_buffer_create((char *)in->plane_info[plane].mm_addr + in->planes[plane].data_offset,
+                            in->plane_info[plane].length, v4l2_free_buffer, in, 0);
+    if (!*buf)
+        return AVERROR(ENOMEM);
+
+    ret = v4l2_buf_increase_ref(in);
+    if (ret)
+        av_buffer_unref(buf);
+
+    return ret;
+}
+
 static int v4l2_bufref_to_buf(V4L2Buffer *out, int plane, const uint8_t* data, int size, int offset, AVBufferRef* bref)
 {
     unsigned int bytesused, length;