From 3c40ffc00f2d3d72e169b333f42678f74ae07148 Mon Sep 17 00:00:00 2001
From: =?utf8?q?V=C3=ADctor=20Manuel=20J=C3=A1quez=20Leal?=
 <vjaquez@igalia.com>
Date: Fri, 12 Mar 2021 12:36:52 +0100
Subject: [PATCH] va: example: multiple-vpp: test direction change

If the driver supports it (iHD, so far) and the parameter -d is set,
the direction of the video will be changed randomly.

In the code you can select, at compilation time, if the direction
change is done by element's property or by pipeline events.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/2074>
---
 tests/examples/va/multiple-vpp.c | 58 +++++++++++++++++++++++++++++++++++++++-
 1 file changed, 57 insertions(+), 1 deletion(-)

diff --git a/tests/examples/va/multiple-vpp.c b/tests/examples/va/multiple-vpp.c
index cd8c784..6466eee 100644
--- a/tests/examples/va/multiple-vpp.c
+++ b/tests/examples/va/multiple-vpp.c
@@ -3,9 +3,12 @@
 #include <gst/gst.h>
 #include <gst/video/video.h>
 
+#define CHANGE_DIR_WITH_EVENT 0
+
 static gint num_buffers = 50;
 static gboolean camera = FALSE;
 static gboolean randomcb = FALSE;
+static gboolean randomdir = FALSE;
 
 static GOptionEntry entries[] = {
   {"num-buffers", 'n', 0, G_OPTION_ARG_INT, &num_buffers,
@@ -14,6 +17,8 @@ static GOptionEntry entries[] = {
       NULL},
   {"random-cb", 'r', 0, G_OPTION_ARG_NONE, &randomcb,
       "Change colorbalance randomly every second", NULL},
+  {"random-dir", 'd', 0, G_OPTION_ARG_NONE, &randomdir,
+      "Change video direction randomly every second (if supported)", NULL},
   {NULL},
 };
 
@@ -186,7 +191,7 @@ build_pipeline (struct _app *app)
   }
 
   app->vpp = gst_bin_get_by_name (GST_BIN (app->pipeline), "vpp");
-  if (!randomcb)
+  if (!randomcb && !randomdir)
     config_vpp (app->vpp);
 
   app->caps = gst_bin_get_by_name (GST_BIN (app->pipeline), "caps");
@@ -223,6 +228,50 @@ change_cb_randomly (gpointer data)
 }
 
 static gboolean
+change_dir_randomly (gpointer data)
+{
+  struct _app *app = data;
+  GObjectClass *g_class = G_OBJECT_GET_CLASS (app->vpp);
+  GParamSpec *pspec;
+
+  pspec = g_object_class_find_property (g_class, "video-direction");
+  if (!pspec)
+    return G_SOURCE_REMOVE;
+
+  /* choose either sent direction by property or by event */
+#if !CHANGE_DIR_WITH_EVENT
+  {
+    GEnumClass *enumclass;
+    guint idx, value;
+
+    enumclass = G_PARAM_SPEC_ENUM (pspec)->enum_class;
+    idx = g_random_int_range (0, enumclass->n_values);
+    value = enumclass->values[idx].value;
+
+    g_object_set (app->vpp, "video-direction", value, NULL);
+  }
+#else
+  {
+    GstEvent *event;
+    guint idx;
+    static const gchar *orientation[] = {
+      "rotate-0", "rotate-90", "rotate-180", "rotate-270",
+      "flip-rotate-0", "flip-rotate-90", "flip-rotate-180", "flip-rotate-270",
+      "undefined",
+    };
+
+    idx = g_random_int_range (0, G_N_ELEMENTS (orientation));
+
+    event = gst_event_new_tag (gst_tag_list_new (GST_TAG_IMAGE_ORIENTATION,
+            orientation[idx], NULL));
+    gst_element_send_event (app->pipeline, event);
+  }
+#endif
+
+  return G_SOURCE_CONTINUE;
+}
+
+static gboolean
 parse_arguments (int *argc, char ***argv)
 {
   GOptionContext *ctxt;
@@ -262,6 +311,13 @@ main (int argc, char **argv)
   if (randomcb)
     g_timeout_add_seconds (1, change_cb_randomly, &app);
 
+  if (randomdir) {
+#if CHANGE_DIR_WITH_EVENT
+    gst_util_set_object_arg (G_OBJECT (app.vpp), "video-direction", "auto");
+#endif
+    g_timeout_add_seconds (1, change_dir_randomly, &app);
+  }
+
   gst_element_set_state (app.pipeline, GST_STATE_PLAYING);
 
   g_main_loop_run (app.loop);
-- 
2.7.4