xref: /OK3568_Linux_fs/buildroot/package/gstreamer1/gst1-plugins-good/0012-v4l2-Support-disabling-buffer-sharing.patch (revision 4882a59341e53eb6f0b4789bf948001014eff981)

From 423ddda18526fe3ad8b84992429ff5225dd993ad Mon Sep 17 00:00:00 2001
From: Jeffy Chen <jeffy.chen@rock-chips.com>
Date: Mon, 27 Jun 2022 17:48:30 +0800
Subject: [PATCH 12/12] v4l2: Support disabling buffer sharing

Tested with:
export GST_DEBUG=v4l2bufferpool:5
gst-launch-1.0 v4l2src no-buffer-sharing=true ! waylandsink

Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
---
 sys/v4l2/gstv4l2object.c | 20 ++++++++++++++++++++
 sys/v4l2/gstv4l2object.h |  5 ++++-
 2 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/sys/v4l2/gstv4l2object.c b/sys/v4l2/gstv4l2object.c
index 4c8791a..4b9402f 100644
--- a/sys/v4l2/gstv4l2object.c
+++ b/sys/v4l2/gstv4l2object.c
@@ -59,6 +59,7 @@ GST_DEBUG_CATEGORY_EXTERN (v4l2_debug);
 #define GST_V4L2_DEFAULT_HEIGHT         240

 static guint DEFAULT_PROP_MIN_BUFFERS = 0;
+static gboolean DEFAULT_PROP_NO_BUFFER_SHARING = FALSE;

 enum
 {
@@ -319,6 +320,9 @@ gst_v4l2_object_install_properties_helper (GObjectClass * gobject_class,
   if (buf)
     DEFAULT_PROP_MIN_BUFFERS = atoi (buf);

+  if ((buf = g_getenv ("GST_V4L2_NO_BUF_SHARING")))
+    DEFAULT_PROP_NO_BUFFER_SHARING = buf[0] == '1';
+
   g_object_class_install_property (gobject_class, PROP_DEVICE,
       g_param_spec_string ("device", "Device", "Device location",
           default_device, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
@@ -444,6 +448,12 @@ gst_v4l2_object_install_properties_helper (GObjectClass * gobject_class,
           0, VIDEO_MAX_FRAME, DEFAULT_PROP_MIN_BUFFERS,
           G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));

+  g_object_class_install_property (gobject_class, PROP_NO_BUFFER_SHARING,
+      g_param_spec_boolean ("no-buffer-sharing", "No buffer sharing",
+          "When enabled, disable buffer sharing",
+	  DEFAULT_PROP_NO_BUFFER_SHARING,
+          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+
   gst_type_mark_as_plugin_api (GST_TYPE_V4L2_DEVICE_FLAGS, 0);
   gst_type_mark_as_plugin_api (GST_TYPE_V4L2_TV_NORM, 0);
   gst_type_mark_as_plugin_api (GST_TYPE_V4L2_IO_MODE, 0);
@@ -562,6 +572,7 @@ gst_v4l2_object_new (GstElement * element,
   }

   v4l2object->min_buffers = DEFAULT_PROP_MIN_BUFFERS;
+  v4l2object->no_buffer_sharing = DEFAULT_PROP_NO_BUFFER_SHARING;

   return v4l2object;
 }
@@ -733,6 +744,9 @@ gst_v4l2_object_set_property_helper (GstV4l2Object * v4l2object,
     case PROP_MIN_BUFFERS:
       v4l2object->min_buffers = g_value_get_uint (value);
       break;
+    case PROP_NO_BUFFER_SHARING:
+      v4l2object->no_buffer_sharing = g_value_get_boolean (value);
+      break;
     default:
       return FALSE;
       break;
@@ -833,6 +847,9 @@ gst_v4l2_object_get_property_helper (GstV4l2Object * v4l2object,
     case PROP_MIN_BUFFERS:
       g_value_set_uint (value, v4l2object->min_buffers);
       break;
+    case PROP_NO_BUFFER_SHARING:
+      g_value_set_boolean (value, v4l2object->no_buffer_sharing);
+      break;
     default:
       return FALSE;
       break;
@@ -5100,6 +5117,9 @@ gst_v4l2_object_decide_allocation (GstV4l2Object * obj, GstQuery * query)
   if (min + obj->min_buffers + 1 > VIDEO_MAX_FRAME)
     can_share_own_pool = FALSE;

+  if (obj->no_buffer_sharing)
+    can_share_own_pool = FALSE;
+
   /* select a pool */
   switch (obj->mode) {
     case GST_V4L2_IO_RW:
diff --git a/sys/v4l2/gstv4l2object.h b/sys/v4l2/gstv4l2object.h
index 276d58f..fbe12b4 100644
--- a/sys/v4l2/gstv4l2object.h
+++ b/sys/v4l2/gstv4l2object.h
@@ -222,6 +222,8 @@ struct _GstV4l2Object {
    * on slow USB firmwares. When this is set, gst_v4l2_set_format() will modify
    * the caps to reflect what was negotiated during fixation */
   gboolean skip_try_fmt_probes;
+
+  gboolean no_buffer_sharing;
 };

 struct _GstV4l2ObjectClassHelper {
@@ -247,7 +249,8 @@ GType gst_v4l2_object_get_type (void);
     PROP_EXTRA_CONTROLS,      \
     PROP_PIXEL_ASPECT_RATIO,  \
     PROP_FORCE_ASPECT_RATIO,  \
-    PROP_MIN_BUFFERS
+    PROP_MIN_BUFFERS,         \
+    PROP_NO_BUFFER_SHARING

 /* create/destroy */
 GstV4l2Object*  gst_v4l2_object_new       (GstElement * element,
--
2.20.1